Science.gov

Sample records for digital multispectral video

  1. Digital video.

    PubMed

    Johnson, Don; Johnson, Mike

    2004-04-01

    The process of digital capture, editing, and archiving video has become an important aspect of documenting arthroscopic surgery. Recording the arthroscopic findings before and after surgery is an essential part of the patient's medical record. The hardware and software has become more reasonable to purchase, but the learning curve to master the software is steep. Digital video is captured at the time of arthroscopy to a hard disk, and written to a CD at the end of the operative procedure. The process of obtaining video of open procedures is more complex. Outside video of the procedure is recorded on digital tape with a digital video camera. The camera must be plugged into a computer to capture the video on the hard disk. Adobe Premiere software is used to edit the video and render the finished video to the hard drive. This finished video is burned onto a CD. We outline the choice of computer hardware and software for the manipulation of digital video. The techniques of backup and archiving the completed projects and files also are outlined. The uses of digital video for education and the formats that can be used in PowerPoint presentations are discussed.

  2. Multispectral Video-Microscope Modified for Skin Diagnostics

    NASA Astrophysics Data System (ADS)

    Rubins, U.; Zaharans, J.; Ļihačova, I.; Spigulis, J.

    2014-12-01

    Commercial DinoLite AD413 digital microscope was modified for skin diagnostics purposes. The original LED ring (4 white and 4 ultraviolet light emitters) of microscope was replaced by a custom-designed 16-LED ring module consisting of four LED groups (450, 545, 660 and 940 nm), and an onboard LED controller with USB hub was added. The video acquisition and LED switching are performed using custom-designed Matlab software which provides real-time spectral analysis of multi-spectral images and calculation of skin chromophore optical density. The developed multispectral video-microscope is mainly meant for diagnostics of skin malformations, e.g. skin cancerous lesions.

  3. Multispectral enhancement towards digital staining.

    PubMed

    Bautista, Pinky A; Yagi, Yukako

    2012-01-01

    Digital staining can be considered as a special form of image enhancement wherein the concern is not only to increase the contrast between the background objects and objects of interest, but to also impart the colors that mark the objects' unique reactions to a specific stain. In this paper, we extended the previously proposed multispectral enhancement methods such that the colors of the background pixels can also be changed. In the previous multispectral enhancement methods a shifting factor is provided to the original spectrum. To implement digital staining, a spectral transformation process is introduced prior to spectral shifting. The enhancement method is applied to multispectral images of H&E stained liver tissue. The resulting digitally stained images show good correlation with the serial-section images of the tissue which are physically stained with Masson's trichrome. We have presented a multispectral enhancement method that can be adjusted to produce digitally stained-images. The current experimental results show the viability of the method. However, to achieve robust enhancement performance issues that arise from variations in staining conditions has to be addressed as well. This would be part of our future work.

  4. Digital Video Editing

    ERIC Educational Resources Information Center

    McConnell, Terry

    2004-01-01

    Monica Adams, head librarian at Robinson Secondary in Fairfax country, Virginia, states that librarians should have the technical knowledge to support projects related to digital video editing. The process of digital video editing and the cables, storage issues and the computer system with software is described.

  5. Digital Video Editing

    ERIC Educational Resources Information Center

    McConnell, Terry

    2004-01-01

    Monica Adams, head librarian at Robinson Secondary in Fairfax country, Virginia, states that librarians should have the technical knowledge to support projects related to digital video editing. The process of digital video editing and the cables, storage issues and the computer system with software is described.

  6. A Prism-Mask System for Multispectral Video Acquisition.

    PubMed

    Cao, Xun; Du, Hao; Tong, Xin; Dai, Qionghai; Lin, Stephen

    2011-12-01

    This paper presents a prism-mask system for capturing multispectral videos. The system is composed of a triangular prism, a monochrome camera, and an occlusion mask. Incoming light beams from the scene are sampled by the occlusion mask, dispersed into their constituent spectra by the triangular prism, and then captured by the monochrome camera. Our system is capable of capturing frames with high spectral resolution at video rates. It also allows for different trade-offs between spectral and spatial resolution by adjusting the focal length of the camera. We demonstrate multispectral video acquisition with various spectral resolutions and spatial resolutions, as well as different frame rates. The effectiveness of our system is further evaluated with several applications, including human skin detection, physical material recognition, video segmentation, RGB video generation, and illumination identification.

  7. An Overview of Digital Video.

    ERIC Educational Resources Information Center

    Barron, Ann E.

    1995-01-01

    Factors driving the shift from analog to digital video storage and retrieval are discussed, including improved compression techniques, reduced hardware costs, and increased network demands. Characteristics of digital video and various compression procedures are described. Applications and guidelines for use of digital video in higher education…

  8. Digital cinema video compression

    NASA Astrophysics Data System (ADS)

    Husak, Walter

    2003-05-01

    The Motion Picture Industry began a transition from film based distribution and projection to digital distribution and projection several years ago. Digital delivery and presentation offers the prospect to increase the quality of the theatrical experience for the audience, reduce distribution costs to the distributors, and create new business opportunities for the theater owners and the studios. Digital Cinema also presents an opportunity to provide increased flexibility and security of the movies for the content owners and the theater operators. Distribution of content via electronic means to theaters is unlike any of the traditional applications for video compression. The transition from film-based media to electronic media represents a paradigm shift in video compression techniques and applications that will be discussed in this paper.

  9. Snapshot spectral and polarimetric imaging; target identification with multispectral video

    NASA Astrophysics Data System (ADS)

    Bartlett, Brent D.; Rodriguez, Mikel D.

    2013-05-01

    As the number of pixels continue to grow in consumer and scientific imaging devices, it has become feasible to collect the incident light field. In this paper, an imaging device developed around light field imaging is used to collect multispectral and polarimetric imagery in a snapshot fashion. The sensor is described and a video data set is shown highlighting the advantage of snapshot spectral imaging. Several novel computer vision approaches are applied to the video cubes to perform scene characterization and target identification. It is shown how the addition of spectral and polarimetric data to the video stream allows for multi-target identification and tracking not possible with traditional RGB video collection.

  10. Crop, soil, and geological mapping from digitized multispectral satellite photography.

    NASA Technical Reports Server (NTRS)

    Anuta, P. E.; Kristof, S. J.; Levandowski, D. W.; Phillips, T. L.; Macdonald, R. B.

    1971-01-01

    An experimental study was conducted of digitized multispectral satellite photography to seek answers to the following two questions: what are the data handling problems and requirements of converting photographic density measurements to a usable digital form, and what surface features can be distinguished using multispectral data taken at satellite altitudes. Results include the digitization of three multiband black and white photographs and a color infrared photograph, the conversion of the results of digitization to a useful digital form, and several data analysis experiments. As a whole, they encourage the use of multiband photography as a multispectral data collection instrument.

  11. Crop, soil, and geological mapping from digitized multispectral satellite photography.

    NASA Technical Reports Server (NTRS)

    Anuta, P. E.; Kristof, S. J.; Levandowski, D. W.; Phillips, T. L.; Macdonald, R. B.

    1971-01-01

    An experimental study was conducted of digitized multispectral satellite photography to seek answers to the following two questions: what are the data handling problems and requirements of converting photographic density measurements to a usable digital form, and what surface features can be distinguished using multispectral data taken at satellite altitudes. Results include the digitization of three multiband black and white photographs and a color infrared photograph, the conversion of the results of digitization to a useful digital form, and several data analysis experiments. As a whole, they encourage the use of multiband photography as a multispectral data collection instrument.

  12. Digital computer processing of peach orchard multispectral aerial photography

    NASA Technical Reports Server (NTRS)

    Atkinson, R. J.

    1976-01-01

    Several methods of analysis using digital computers applicable to digitized multispectral aerial photography, are described, with particular application to peach orchard test sites. This effort was stimulated by the recent premature death of peach trees in the Southeastern United States. The techniques discussed are: (1) correction of intensity variations by digital filtering, (2) automatic detection and enumeration of trees in five size categories, (3) determination of unhealthy foliage by infrared reflectances, and (4) four band multispectral classification into healthy and declining categories.

  13. Video Games and Digital Literacies

    ERIC Educational Resources Information Center

    Steinkuehler, Constance

    2010-01-01

    Today's youth are situated in a complex information ecology that includes video games and print texts. At the basic level, video game play itself is a form of digital literacy practice. If we widen our focus from the "individual player + technology" to the online communities that play them, we find that video games also lie at the nexus of a…

  14. Video Games and Digital Literacies

    ERIC Educational Resources Information Center

    Steinkuehler, Constance

    2010-01-01

    Today's youth are situated in a complex information ecology that includes video games and print texts. At the basic level, video game play itself is a form of digital literacy practice. If we widen our focus from the "individual player + technology" to the online communities that play them, we find that video games also lie at the nexus of a…

  15. Design and implementation of digital airborne multispectral camera system

    NASA Astrophysics Data System (ADS)

    Lin, Zhaorong; Zhang, Xuguo; Wang, Li; Pan, Deai

    2012-10-01

    The multispectral imaging equipment is a kind of new generation remote sensor, which can obtain the target image and the spectra information simultaneously. A digital airborne multispectral camera system using discrete filter method had been designed and implemented for unmanned aerial vehicle (UAV) and manned aircraft platforms. The digital airborne multispectral camera system has the advantages of larger frame, higher resolution, panchromatic and multispectral imaging. It also has great potential applications in the fields of environmental and agricultural monitoring and target detection and discrimination. In order to enhance the measurement precision and accuracy of position and orientation, Inertial Measurement Unit (IMU) is integrated in the digital airborne multispectral camera. Meanwhile, the Temperature Control Unit (TCU) guarantees that the camera can operate in the normal state in different altitudes to avoid the window fogging and frosting which will degrade the imaging quality greatly. Finally, Flying experiments were conducted to demonstrate the functionality and performance of the digital airborne multispectral camera. The resolution capability, positioning accuracy and classification and recognition ability were validated.

  16. Digital Video Over Space Systems and Networks

    NASA Technical Reports Server (NTRS)

    Grubbs, Rodney

    2010-01-01

    This slide presentation reviews the improvements and challenges that digital video provides over analog video. The use of digital video over IP options and trade offs, link integrity and latency are reviewed.

  17. Indexing, Browsing, and Searching of Digital Video.

    ERIC Educational Resources Information Center

    Smeaton, Alan F.

    2004-01-01

    Presents a literature review that covers the following topics related to indexing, browsing, and searching of digital video: video coding and standards; conventional approaches to accessing digital video; automatically structuring and indexing digital video; searching, browsing, and summarization; measurement and evaluation of the effectiveness of…

  18. Indexing, Browsing, and Searching of Digital Video.

    ERIC Educational Resources Information Center

    Smeaton, Alan F.

    2004-01-01

    Presents a literature review that covers the following topics related to indexing, browsing, and searching of digital video: video coding and standards; conventional approaches to accessing digital video; automatically structuring and indexing digital video; searching, browsing, and summarization; measurement and evaluation of the effectiveness of…

  19. Digital Video: Get with It!

    ERIC Educational Resources Information Center

    Van Horn, Royal

    2001-01-01

    Several years after the first audiovisual Macintosh computer appeared, most educators are still oblivious of this technology. Almost every other economic sector (including the porn industry) makes abundant use of digital and streaming video. Desktop movie production is so easy that primary grade students can do it. Tips are provided. (MLH)

  20. Digital Video: Get with It!

    ERIC Educational Resources Information Center

    Van Horn, Royal

    2001-01-01

    Several years after the first audiovisual Macintosh computer appeared, most educators are still oblivious of this technology. Almost every other economic sector (including the porn industry) makes abundant use of digital and streaming video. Desktop movie production is so easy that primary grade students can do it. Tips are provided. (MLH)

  1. Color spaces in digital video

    SciTech Connect

    Gaunt, R.

    1997-05-01

    Whether it`s photography, computer graphics, publishing, or video; each medium has a defined color space, or gamut, which defines the extent that a given set of RGB colors can be mixed. When converting from one medium to another, an image must go through some form of conversion which maps colors into the destination color space. The conversion process isn`t always straight forward, easy, or reversible. In video, two common analog composite color spaces are Y`tjv (used in PAL) and Y`IQ (used in NTSC). These two color spaces have been around since the beginning of color television, and are primarily used in video transmission. Another analog scheme used in broadcast studios is Y`, R`-Y`, B`-Y` (used in Betacam and Mll) which is a component format. Y`, R`-Y`,B`-Y` maintains the color information of RGB but in less space. From this, the digital component video specification, ITU-Rec. 601-4 (formerly CCIR Rec. 601) was based. The color space for Rec. 601 is symbolized as Y`CbCr. Digital video formats such as DV, Dl, Digital-S, etc., use Rec. 601 to define their color gamut. Digital composite video (for D2 tape) is digitized analog Y`UV and is seeing decreased use. Because so much information is contained in video, segments of any significant length usually require some form of data compression. All of the above mentioned analog video formats are a means of reducing the bandwidth of RGB video. Video bulk storage devices, such as digital disk recorders, usually store frames in Y`CbCr format, even if no other compression method is used. Computer graphics and computer animations originate in RGB format because RGB must be used to calculate lighting and shadows. But storage of long animations in RGB format is usually cost prohibitive and a 30 frame-per-second data rate of uncompressed RGB is beyond most computers. By taking advantage of certain aspects of the human visual system, true color 24-bit RGB video images can be compressed with minimal loss of visual information

  2. Lensless multispectral digital in-line holographic microscope.

    PubMed

    Ryle, James P; McDonnell, Susan; Sheridan, John T

    2011-12-01

    An compact multispectral digital in-line holographic microscope (DIHM) is developed that emulates Gabor's original holographic principle. Using sources of varying spatial coherence (laser, LED), holographic images of objects, including optical fiber, latex microspheres, and cancer cells, are successfully captured and numerically processed. Quantitative measurement of cell locations and percentage confluence are estimated, and pseudocolor images are also presented. Phase profiles of weakly scattering cells are obtained from the DIHM and are compared to those produced by a commercially available off-axis digital holographic microscope.

  3. Lensless multispectral digital in-line holographic microscope

    NASA Astrophysics Data System (ADS)

    Ryle, James P.; McDonnell, Susan; Sheridan, John T.

    2011-12-01

    An compact multispectral digital in-line holographic microscope (DIHM) is developed that emulates Gabor's original holographic principle. Using sources of varying spatial coherence (laser, LED), holographic images of objects, including optical fiber, latex microspheres, and cancer cells, are successfully captured and numerically processed. Quantitative measurement of cell locations and percentage confluence are estimated, and pseudocolor images are also presented. Phase profiles of weakly scattering cells are obtained from the DIHM and are compared to those produced by a commercially available off-axis digital holographic microscope.

  4. Understanding Computer-Based Digital Video.

    ERIC Educational Resources Information Center

    Martindale, Trey

    2002-01-01

    Discussion of new educational media and technology focuses on producing and delivering computer-based digital video. Highlights include video standards, including international standards and aspect ratio; camera formats and features, including costs; shooting digital video; editing software; compression; and a list of informative Web sites. (LRW)

  5. Authentication of digital video evidence

    NASA Astrophysics Data System (ADS)

    Beser, Nicholas D.; Duerr, Thomas E.; Staisiunas, Gregory P.

    2003-11-01

    In response to a requirement from the United States Postal Inspection Service, the Technical Support Working Group tasked The Johns Hopkins University Applied Physics Laboratory (JHU/APL) to develop a technique tha will ensure the authenticity, or integrity, of digital video (DV). Verifiable integrity is needed if DV evidence is to withstand a challenge to its admissibility in court on the grounds that it can be easily edited. Specifically, the verification technique must detect additions, deletions, or modifications to DV and satisfy the two-part criteria pertaining to scientific evidence as articulated in Daubert et al. v. Merrell Dow Pharmaceuticals Inc., 43 F3d (9th Circuit, 1995). JHU/APL has developed a prototype digital video authenticator (DVA) that generates digital signatures based on public key cryptography at the frame level of the DV. Signature generation and recording is accomplished at the same time as DV is recorded by the camcorder. Throughput supports the consumer-grade camcorder data rate of 25 Mbps. The DVA software is implemented on a commercial laptop computer, which is connected to a commercial digital camcorder via the IEEE-1394 serial interface. A security token provides agent identification and the interface to the public key infrastructure (PKI) that is needed for management of the public keys central to DV integrity verification.

  6. Estimating crop water requirements of a command area using multispectral video imagery and geographic information systems

    NASA Astrophysics Data System (ADS)

    Ahmed, Rashid Hassan

    This research focused on the potential use of multispectral video remote sensing for irrigation water management. Two methods for estimating crop evapotranspiration were investigated, the energy balance estimation from multispectral video imagery and use of reflectance-based crop coefficients from multitemporal multispectral video imagery. The energy balance method was based on estimating net radiation, and soil and sensible heat fluxes, using input from the multispectral video imagery. The latent heat flux was estimated as a residual. The results were compared to surface heat fluxes measured on the ground. The net radiation was estimated within 5% of the measured values. However, the estimates of sensible and soil heat fluxes were not consistent with the measured values. This discrepancy was attributed to the methods for estimating the two fluxes. The degree of uncertainty in the parameters used in the methods made their application too limited for extrapolation to large agricultural areas. The second method used reflectance-based crop coefficients developed from the multispectral video imagery using alfalfa as a reference crop. The daily evapotranspiration from alfalfa was estimated using a nearby weather station. With the crop coefficients known for a canal command area, irrigation scheduling was simulated using the soil moisture balance method. The estimated soil moisture matched the actual soil moisture measured using the neutron probe method. Also, the overall water requirement estimated by this method was found to be in close agreement with the canal water deliveries. The crop coefficient method has great potential for irrigation management of large agricultural areas.

  7. Geometric analysis and restitution of digital multispectral scanner data arrays

    NASA Technical Reports Server (NTRS)

    Baker, J. R.; Mikhail, E. M.

    1975-01-01

    An investigation was conducted to define causes of geometric defects within digital multispectral scanner (MSS) data arrays, to analyze the resulting geometric errors, and to investigate restitution methods to correct or reduce these errors. Geometric transformation relationships for scanned data, from which collinearity equations may be derived, served as the basis of parametric methods of analysis and restitution of MSS digital data arrays. The linearization of these collinearity equations is presented. Algorithms considered for use in analysis and restitution included the MSS collinearity equations, piecewise polynomials based on linearized collinearity equations, and nonparametric algorithms. A proposed system for geometric analysis and restitution of MSS digital data arrays was used to evaluate these algorithms, utilizing actual MSS data arrays. It was shown that collinearity equations and nonparametric algorithms both yield acceptable results, but nonparametric algorithms possess definite advantages in computational efficiency. Piecewise polynomials were found to yield inferior results.

  8. The interactive digital video interface

    NASA Technical Reports Server (NTRS)

    Doyle, Michael D.

    1989-01-01

    A frequent complaint in the computer oriented trade journals is that current hardware technology is progressing so quickly that software developers cannot keep up. A example of this phenomenon can be seen in the field of microcomputer graphics. To exploit the advantages of new mechanisms of information storage and retrieval, new approaches must be made towards incorporating existing programs as well as developing entirely new applications. A particular area of need is the correlation of discrete image elements to textural information. The interactive digital video (IDV) interface embodies a new concept in software design which addresses these needs. The IDV interface is a patented device and language independent process for identifying image features on a digital video display and which allows a number of different processes to be keyed to that identification. Its capabilities include the correlation of discrete image elements to relevant text information and the correlation of these image features to other images as well as to program control mechanisms. Sophisticated interrelationships can be set up between images, text, and program control mechanisms.

  9. State Skill Standards: Digital Video & Broadcast Production

    ERIC Educational Resources Information Center

    Bullard, Susan; Tanner, Robin; Reedy, Brian; Grabavoi, Daphne; Ertman, James; Olson, Mark; Vaughan, Karen; Espinola, Ron

    2007-01-01

    The standards in this document are for digital video and broadcast production programs and are designed to clearly state what the student should know and be able to do upon completion of an advanced high-school program. Digital Video and Broadcast Production is a program that consists of the initial fundamentals and sequential courses that prepare…

  10. Digital Video Revisited: Storytelling, Conferencing, Remixing

    ERIC Educational Resources Information Center

    Godwin-Jones, Robert

    2012-01-01

    Five years ago in the February, 2007, issue of LLT, I wrote about developments in digital video of potential interest to language teachers. Since then, there have been major changes in options for video capture, editing, and delivery. One of the most significant has been the rise in popularity of video-based storytelling, enabled largely by…

  11. Digital Video Revisited: Storytelling, Conferencing, Remixing

    ERIC Educational Resources Information Center

    Godwin-Jones, Robert

    2012-01-01

    Five years ago in the February, 2007, issue of LLT, I wrote about developments in digital video of potential interest to language teachers. Since then, there have been major changes in options for video capture, editing, and delivery. One of the most significant has been the rise in popularity of video-based storytelling, enabled largely by…

  12. Digital Video Over Space Systems and Networks

    NASA Technical Reports Server (NTRS)

    Grubbs, Rodney

    2010-01-01

    This slide presentation reviews the use of digital video with space systems and networks. The earliest use of video was the use of film precluding live viewing, which gave way to live television from space. This has given way to digital video using internet protocol for transmission. This has provided for many improvements with new challenges. Some of these ehallenges are reviewed. The change to digital video transmitted over space systems can provide incredible imagery, however the process must be viewed as an entire system, rather than piece-meal.

  13. Digital imaging and video: principles and applications.

    PubMed

    Rosen, Andrew L; Hausman, Michael

    2003-01-01

    Digital imaging has provided orthopaedic surgeons with new, powerful tools that offer a multitude of applications. Already integral to several common medical devices, digital images can be used for case documentation and presentation as well as for diagnostic and surgical patient care information. Educational presentation has been transformed by the use of computers and digital projectors. Understanding the basic foundations of digital imaging technology is important for effectively creating digital images, videos, and presentations.

  14. Multispectral lensless digital in-line holographic microscope: LED illumination

    NASA Astrophysics Data System (ADS)

    Ryle, James P.; McDonnell, Susan; Sheridan, John T.

    2010-05-01

    Holography is the process where two coherent wavefields interfere resulting in an interference pattern from which whole field information can be retrieved. Digital holography is the process where the intensity of the superposition of the two waves is recorded using a light sensitive opto-electronic detector array such as a CCD or CMOS camera. From this recorded hologram it is possible to numerically reconstruct the object wavefield. When an optical beam is focused on a pinhole whose diameter is of the order of a few times the wavelength of the illumination beam, a spherically divergent wavefield is emitted. We use the emitted optical beam to illuminate weakly scattering objects resulting in a geometrically magnified diffraction pattern at the camera face. Scattered light from the object is the called the object wavefield, while unscattered light acts as the reference wavefield. The hologram is captured digitally before numerical reconstruction is applied to yield whole field information about the object. It is possible to reconstruct the objects wavefield using this method from coherent laser or incoherent LED illumination. The emitted light from the pinhole acts a pointsource of spatially coherent light enabling holography. This, in combination with the use of multiple wavelength LED's multispectral amplitude images can be reconstructed. The multispectral lensless DIHM described here can be used to holographically image biological specimens such as cells grown for use in the biopharmaceutical industry or for research purposes. In analysing cell viability based on the trypan blue assay, the outer membrane of non-viable cells is penetrated by violet blue dye. Using such a Digital In-line Holographic Microscope as described here, automatic classification of viable and non-viable cells could be performed.

  15. Stroboscopic artifact in digital video-EEG.

    PubMed

    Quigg, Mark; Taft, William

    2004-01-01

    Combined digital video-EEG (DV-EEG) systems eliminate many familiar technical artifacts of older analog recorders; however, new and unanticipated technical issues are becoming evident. In this report, a case is described that identifies one of these technical limitations that could represent a pitfall to accurate data interpretation. An EEG was recorded on an 18-year-old man with history of photically sensitive generalized tonic-clonic seizures, revealing photoparoxysmal responses that appeared to outlast photic stimulation. However, in an attempted video-EEG correlation, the digital video recording showed variable appearance or absence of photic bursts that did not correlate with EEG photic tick marks, initially suggesting desynchronization between video and EEG signals. However, the absence of flashes seen on the video record resulted from stroboscopic artifact caused by mismatch between strobe frequency, video sampling rate, and video display characteristics. Stroboscopic aliasing is a DV-EEG specific artifact that can complicate accurate interpretation of photoparoxysmal responses.

  16. Multispectral synthesis of daylight using a commercial digital CCD camera.

    PubMed

    Nieves, Juan L; Valero, Eva M; Nascimento, Sérgio M C; Hernández-Andrés, Javier; Romero, Javier

    2005-09-20

    Performance of multispectral devices in recovering spectral data has been intensively investigated in some applications, as in spectral characterization of art paintings, but has received little attention in the context of spectral characterization of natural illumination. This study investigated the quality of the spectral estimation of daylight-type illuminants using a commercial digital CCD camera and a set of broadband colored filters. Several recovery algorithms that did not need information about spectral sensitivities of the camera sensors nor eigenvectors to describe the spectra were tested. Tests were carried out both with virtual data, using simulated camera responses, and real data obtained from real measurements. It was found that it is possible to recover daylight spectra with high spectral and colorimetric accuracy with a reduced number of three to nine spectral bands.

  17. Exchanging digital video of laryngeal examinations.

    PubMed

    Crump, John M; Deutsch, Thomas

    2004-03-01

    Laryngeal examinations, especially stroboscopic examinations, are increasingly recorded using digital video formats on computer media, rather than using analog formats on videotape. It would be useful to share these examinations with other medical professionals in formats that would facilitate reliable and high-quality playback on a personal computer by the recipients. Unfortunately, a personal computer is not well designed for reliable presentation of artifact-free video. It is particularly important that laryngeal video play without artifacts of motion or color because these are often the characteristics of greatest clinical interest. With proper tools and procedures, and with reasonable compromises in image resolution and the duration of the examination, digital video of laryngeal examinations can be reliably exchanged. However, the tools, procedures, and formats for recording, converting to another digital format ("transcoding"), communicating, copying, and playing digital video with a personal computer are not familiar to most medical professionals. Some understanding of digital video and the tools available is required of those wanting to exchange digital video. Best results are achieved by recording to a digital format best suited for recording (such as MJPEG or DV),judiciously selecting a segment of the recording for sharing, and converting to a format suited to distribution (such as MPEG1 or MPEG2) using a medium suited to the situation (such as e-mail attachment, CD-ROM, a "clip" within a Microsoft PowerPoint presentation, or DVD-Video). If digital video is sent to a colleague, some guidance on playing files and using a PC media player is helpful.

  18. ESL and Digital Video Integration: Case Studies

    ERIC Educational Resources Information Center

    Li, J., Ed.; Gromik, N., Ed.; Edwards, N., Ed.

    2013-01-01

    It should come as no surprise that digital video technology is of particular interest to English language learners; students are drawn to its visual appeal and vibrant creative potential. The seven original case studies in this book demonstrate how video can be an effective and powerful tool to create fluid, fun, interactive, and collaborative…

  19. ESL and Digital Video Integration: Case Studies

    ERIC Educational Resources Information Center

    Li, J., Ed.; Gromik, N., Ed.; Edwards, N., Ed.

    2013-01-01

    It should come as no surprise that digital video technology is of particular interest to English language learners; students are drawn to its visual appeal and vibrant creative potential. The seven original case studies in this book demonstrate how video can be an effective and powerful tool to create fluid, fun, interactive, and collaborative…

  20. A Multi-View Intelligent Editor for Digital Video Libraries.

    ERIC Educational Resources Information Center

    Myers, Brad A.; Casares, Juan P.; Stevens, Scott; Dabbish, Laura; Yocum, Dan; Corbett, Albert

    Digital video is becoming increasingly ubiquitous. Most camcorders today are digital, and computers are being advertised based on their video editing capabilities. Many exciting research projects are investigating how to search, visualize, and summarize digital video, but there is little work on new ways to support the use of the video beyond just…

  1. High-performance digital color video camera

    NASA Astrophysics Data System (ADS)

    Parulski, Kenneth A.; D'Luna, Lionel J.; Benamati, Brian L.; Shelley, Paul R.

    1992-01-01

    Typical one-chip color cameras use analog video processing circuits. An improved digital camera architecture has been developed using a dual-slope A/D conversion technique and two full-custom CMOS digital video processing integrated circuits, the color filter array (CFA) processor and the RGB postprocessor. The system used a 768 X 484 active element interline transfer CCD with a new field-staggered 3G color filter pattern and a lenslet overlay, which doubles the sensitivity of the camera. The industrial-quality digital camera design offers improved image quality, reliability, manufacturability, while meeting aggressive size, power, and cost constraints. The CFA processor digital VLSI chip includes color filter interpolation processing, an optical black clamp, defect correction, white balance, and gain control. The RGB postprocessor digital integrated circuit includes a color correction matrix, gamma correction, 2D edge enhancement, and circuits to control the black balance, lens aperture, and focus.

  2. High-performance digital color video camera

    NASA Astrophysics Data System (ADS)

    Parulski, Kenneth A.; Benamati, Brian L.; D'Luna, Lionel J.; Shelley, Paul R.

    1991-06-01

    Typical one-chip color cameras use analog video processing circuits. An improved digital camera architecture has been developed using a dual-slope A/D conversion technique, and two full custom CMOS digital video processing ICs, the 'CFA processor' and the 'RGB post- processor.' The system uses a 768 X 484 active element interline transfer CCD with a new 'field-staggered 3G' color filter pattern and a 'lenslet' overlay, which doubles the sensitivity of the camera. The digital camera design offers improved image quality, reliability, and manufacturability, while meeting aggressive size, power, and cost constraints. The CFA processor digital VLSI chip includes color filter interpolation processing, an optical black clamp, defect correction, white balance, and gain control. The RGB post-processor digital IC includes a color correction matrix, gamma correction, two-dimensional edge-enhancement, and circuits to control the black balance, lens aperture, and focus.

  3. Multispectral digital holographic microscopy with applications in water quality assessment

    NASA Astrophysics Data System (ADS)

    Kazemzadeh, Farnoud; Jin, Chao; Yu, Mei; Amelard, Robert; Haider, Shahid; Saini, Simarjeet; Emelko, Monica; Clausi, David A.; Wong, Alexander

    2015-09-01

    Safe drinking water is essential for human health, yet over a billion people worldwide do not have access to safe drinking water. Due to the presence and accumulation of biological contaminants in natural waters (e.g., pathogens and neuro-, hepato-, and cytotoxins associated with algal blooms) remain a critical challenge in the provision of safe drinking water globally. It is not financially feasible and practical to monitor and quantify water quality frequently enough to identify the potential health risk due to contamination, especially in developing countries. We propose a low-cost, small-profile multispectral (MS) system based on Digital Holographic Microscopy (DHM) and investigate methods for rapidly capturing holographic data of natural water samples. We have developed a test-bed for an MSDHM instrument to produce and capture holographic data of the sample at different wavelengths in the visible and the near Infra-red spectral region, allowing for resolution improvement in the reconstructed images. Additionally, we have developed high-speed statistical signal processing and analysis techniques to facilitate rapid reconstruction and assessment of the MS holographic data being captured by the MSDHM instrument. The proposed system is used to examine cyanobacteria as well as Cryptosporidium parvum oocysts which remain important and difficult to treat microbiological contaminants that must be addressed for the provision of safe drinking water globally.

  4. Digital video recording of cardiac surgical procedures.

    PubMed

    Kumar, A Sampath; Pal, Harinder

    2004-03-01

    We attempted to find a method of reducing time and effort for recording videos of cardiac surgical procedures. A camera mounting arm designed by us provided a properly fixed digital camera location for undisturbed recording. The camera and its remote control unit provided an opportunity for the surgeon to record only the steps of the operation without need for editing. Digital videos produced by this method required no additional time from the surgeon except to record the commentary at leisure. The video recorded was of excellent quality and provided a well-focused recording of the steps of the operation. The technique described for video recording of cardiac surgical procedures provides a time-saving and easy method for good reproduction of surgical procedures.

  5. Multispectral Digital Image Analysis of Varved Sediments in Thin Sections

    NASA Astrophysics Data System (ADS)

    Jäger, K.; Rein, B.; Dietrich, S.

    2006-12-01

    An update of the recently developed method COMPONENTS (Rein, 2003, Rein & Jäger, subm.) for the discrimination of sediment components in thin sections is presented here. COMPONENTS uses a 6-band (multispectral) image analysis. To derive six-band spectral information of the sediments, thin sections are scanned with a digital camera mounted on a polarizing microscope. The thin sections are scanned twice, under polarized and under unpolarized plain light. During each run RGB images are acquired which are subsequently stacked to a six-band file. The first three bands (Blue=1, Green=2, Red=3) result from the spectral behaviour in the blue, green and red band with unpolarized light conditions, and the bands 4 to 6 (Blue=4, Green=5, Red=6) from the polarized light run. The next step is the discrimination of the sediment components by their transmission behaviour. Automatic classification algorithms broadly used in remote sensing applications cannot be used due to unavoidable variations of sediment particle or thin section thicknesses that change absolute grey values of the sediment components. Thus, we use an approach based on band ratios, also known as indices. By using band ratios, the grey values measured in different bands are normalized against each other and illumination variations (e.g. thickness variations) are eliminated. By combining specific ratios we are able to detect all seven major components in the investigated sediments (carbonates, diatoms, fine clastic material, plant rests, pyrite, quartz and resin). Then, the classification results (compositional maps) are validated. Although the automatic classification and the analogous classification show high concordances, some systematic errors could be identified. For example, the transition zone between the sediment and resin filled cracks is classified as fine clastic material and very coarse carbonates are partly classified as quartz because coarse carbonates can be very bright and spectra are partly

  6. NASA's Myriad Uses of Digital Video

    NASA Technical Reports Server (NTRS)

    Grubbs, Rodney; Lindblom, Walt; George, Sandy

    1999-01-01

    Since it's inception, NASA has created many of the most memorable images seen this Century. From the fuzzy video of Neil Armstrong taking that first step on the moon, to images of the Mars surface available to all on the internet, NASA has provided images to inspire a generation, all because a scientist or researcher had a requirement to see something unusual. Digital Television technology will give NASA unprecedented new tools for acquiring, analyzing, and distributing video. This paper will explore NASA's DTV future. The agency has a requirement to move video from one NASA Center to another, in real time. Specifics will be provided relating to the NASA video infrastructure, including video from the Space Shuttle and from the various Centers. A comparison of the pros and cons of interlace and progressive scanned images will be presented. Film is a major component of NASA's image acquisition for analysis usage. The future of film within the context of DTV will be explored.

  7. Multispectral assessment of skin malformations using a modified video-microscope

    NASA Astrophysics Data System (ADS)

    Bekina, A.; Diebele, I.; Rubins, U.; Zaharans, J.; Derjabo, A.; Spigulis, J.

    2012-10-01

    A simplified method is proposed for alternative clinical diagnostics of skin malformations. A modified digital microscope, additionally equipped with a fourcolour LED (450 nm, 545 nm, 660 nm and 940 nm) subsequent illumination system, was applied for assessment of skin cancerous lesions and cutaneous inflammations. Multispectral image analysis was performed to map distributions of skin erythema index, bilirubin index, melanoma/nevus differentiation parameter, and fluorescence indicator. The skin malformation monitoring has shown that it is possible to differentiate melanoma from other pathologies.

  8. Enhancing Proficiency Level Using Digital Video

    ERIC Educational Resources Information Center

    Fujioka-Ito, Noriko

    2009-01-01

    This article reports a case study where the data was collected at one university in the United States. It shows the benefits of using digital videos in intermediate-level Japanese language course curriculum so that learners can develop a higher level of proficiency. Since advanced-level speakers, according to the American Council on the Teaching…

  9. Speech Recognition for A Digital Video Library.

    ERIC Educational Resources Information Center

    Witbrock, Michael J.; Hauptmann, Alexander G.

    1998-01-01

    Production of the meta-data supporting the Informedia Digital Video Library interface is automated using techniques derived from artificial intelligence research. Speech recognition and natural-language processing, information retrieval, and image analysis are applied to produce an interface that helps users locate information and navigate more…

  10. Speech Recognition for A Digital Video Library.

    ERIC Educational Resources Information Center

    Witbrock, Michael J.; Hauptmann, Alexander G.

    1998-01-01

    Production of the meta-data supporting the Informedia Digital Video Library interface is automated using techniques derived from artificial intelligence research. Speech recognition and natural-language processing, information retrieval, and image analysis are applied to produce an interface that helps users locate information and navigate more…

  11. Digital video steganalysis exploiting collusion sensitivity

    NASA Astrophysics Data System (ADS)

    Budhia, Udit; Kundur, Deepa

    2004-09-01

    In this paper we present an effective steganalyis technique for digital video sequences based on the collusion attack. Steganalysis is the process of detecting with a high probability and low complexity the presence of covert data in multimedia. Existing algorithms for steganalysis target detecting covert information in still images. When applied directly to video sequences these approaches are suboptimal. In this paper, we present a method that overcomes this limitation by using redundant information present in the temporal domain to detect covert messages in the form of Gaussian watermarks. Our gains are achieved by exploiting the collusion attack that has recently been studied in the field of digital video watermarking, and more sophisticated pattern recognition tools. Applications of our scheme include cybersecurity and cyberforensics.

  12. Realization of video electronics system in the space-borne multispectral imager

    NASA Astrophysics Data System (ADS)

    Rong, Peng; Lei, Ning; Cheng, Ganglin; Huang, Jing

    2015-08-01

    In this paper, a new multispectral imager video electronics system is introduced. The system has an imaging function of visible spectrum (VIS), near infrared spectrum (NIR), short wave infrared spectrum (SWIR), medium wave infrared spectrum (MWIR) and long wave infrared spectrum (LWIR). It is comprised of three video processors and an information processor. Three video processors are VIS-NIR processor, SWIR-MWIR processor and LWIR processor. The VIS-NIR processor uses time delay and integration charge coupled devices (TDICCD) as detector, samples and quantifies CCD signal under the mode of correlated double sampling (CDS), corrects image data by using large-scale field programmable gate array (FPGA). The application methods of SWIR-MWIR processor and LWIR processor are similar. Information processor is the most important part of the video electronics systems. It is responsible for receiving remote control command from other equipments, transmitting telemetric data, controlling the three video processors working synchronously, encoding and transmitting the image data from the video processor. Besides the introduction of system's functions and system composition framework, detailed implementation methods of some important components will be described in this paper as well. The experimental result shows that all main technical indexes meet the design requirement.

  13. Preprocessing of compressed digital video

    NASA Astrophysics Data System (ADS)

    Segall, C. Andrew; Karunaratne, Passant V.; Katsaggelos, Aggelos K.

    2000-12-01

    Pre-processing algorithms improve on the performance of a video compression system by removing spurious noise and insignificant features from the original images. This increases compression efficiency and attenuates coding artifacts. Unfortunately, determining the appropriate amount of pre-filtering is a difficult problem, as it depends on both the content of an image as well as the target bit-rate of compression algorithm. In this paper, we explore a pre- processing technique that is loosely coupled to the quantization decisions of a rate control mechanism. This technique results in a pre-processing system that operates directly on the Displaced Frame Difference (DFD) and is applicable to any standard-compatible compression system. Results explore the effect of several standard filters on the DFD. An adaptive technique is then considered.

  14. In-vivo multispectral video endoscopy towards in-vivo hyperspectral video endoscopy.

    PubMed

    Hohmann, Martin; Kanawade, R; Klämpfl, F; Douplik, A; Mudter, J; Neurath, M F; Albrecht, H

    2017-04-01

    For in-vivo diagnostics of cancer and pre-cancer in the stomach, there is no endoscopic procedure offering both high sensitivity and high specificity. Our data suggest that multispectral or hyperspectral imaging may be helpful to solve this problem. It is successfully applied to the detection and analysis of easily reachable carcinomas, ex-vivo samples of hollow organ mucosal carcinomas and also histological samples. An endoscopy system which allows flexible multispectral videoendoscopy for in-vivo diagnostics has so far been unavailable. To overcome this problem, we modified a standard Olympus endoscopy system to conduct in-vivo multispectral imaging of the upper GI tract. The pilot study is performed on 14 patients with adeno carcinomas in the stomach. For analysis, Support Vector Machine with linear and Gaussian Kernel, AdaBoost, RobustBoost and Random-Forest-walk are used and compared for the data classification with a leave-one-out strategy. The margin of the carcinoma for the training of the classifier is drawn by expert-labeling. The cancer findings are cross-checked by biopsies. We expect that the present study will help to improve the further development of hyperspectral endoscopy and to overcome some of the problems to be faced in this process. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

  15. Bridging analog and digital video in the surgical setting.

    PubMed

    Miron, Hagai; Blumenthal, Eytan Z

    2003-10-01

    Editing surgical videos requires a basic understanding of key technical issues, especially when transforming from analog to digital media. These issues include an understanding of compression-decompression (eg, MPEGs), generation quality loss, video formats, and compression ratios. We introduce basic terminology and concepts related to analog and digital video, emphasizing the process of converting analog video to digital files. The choice of hardware, software, and formats is discussed, including advantages and drawbacks. Last, we provide an inexpensive hardware-software solution.

  16. A Digital Video Model Deformation System

    NASA Technical Reports Server (NTRS)

    Burner, A. W.; Snow, W. L.; Goad, W. K.; Childers, B. A.

    1986-01-01

    The use of slid-state array cameras and a PC controlled image acquisition system to measure model deformation in a wind tunnel is discussed. This digital system is an improvement to an earlier video model deformation system used at the National Transonic Facility (NTF) which employed high-resolution tube cameras and required the manual measurement of targets on video hardcopy images. The new system eliminates both the vibration-induced distortion associated with tube cameras and the manual readup of video images necessary in the earlier version. Camera calibration and data reduction procedures necessary to convert pixel image plane data from two cameras into wing deflections are presented. Laboratory tests to establish the uncertainty of the new system with the geometry to be used at the NTF are described.

  17. A digital video model deformation system

    NASA Astrophysics Data System (ADS)

    Burner, A. W.; Snow, W. L.; Goad, W. K.; Childers, B. A.

    The use of solid-state array cameras and a PC-controlled image acquisition system to measure model deformation in a wind tunnel is discussed. This digital system improves an earlier video model deformation system that used high-resolution tube cameras and required the manual measurement of targets on video hardcopy images. The new system eliminates both the vibration-induced distortion associated with tube cameras and the manual readup of video images necessary in the earlier version. Camera calibration and data reduction procedures necessary to convert pixel image plane data from two cameras into wing deflections are presented. Laboratory tests to establish the uncertainty of the system with the geometry to be used are described.

  18. Digital video technologies and their network requirements

    SciTech Connect

    R. P. Tsang; H. Y. Chen; J. M. Brandt; J. A. Hutchins

    1999-11-01

    Coded digital video signals are considered to be one of the most difficult data types to transport due to their real-time requirements and high bit rate variability. In this study, the authors discuss the coding mechanisms incorporated by the major compression standards bodies, i.e., JPEG and MPEG, as well as more advanced coding mechanisms such as wavelet and fractal techniques. The relationship between the applications which use these coding schemes and their network requirements are the major focus of this study. Specifically, the authors relate network latency, channel transmission reliability, random access speed, buffering and network bandwidth with the various coding techniques as a function of the applications which use them. Such applications include High-Definition Television, Video Conferencing, Computer-Supported Collaborative Work (CSCW), and Medical Imaging.

  19. Perceptual-components architecture for digital video

    NASA Technical Reports Server (NTRS)

    Watson, Andrew B.

    1990-01-01

    A perceptual-components architecture for digital video partitions the image stream into signal components in a manner analogous to that used in the human visual system. These components consist of achromatic and opponent color channels, divided into static and motion channels, further divided into bands of particular spatial frequency and orientation. Bits are allocated to an individual band in accord with visual sensitivity to that band and in accord with the properties of visual masking. This architecture is argued to have desirable features such as efficiency, error tolerance, scalability, device independence, and extensibility.

  20. Portable Video/Digital Retinal Funduscope

    NASA Technical Reports Server (NTRS)

    Taylor, Gerald R.; Meehan, Richard; Hunter, Norwood; Caputo, Michael; Gibson, C. Robert

    1991-01-01

    Lightweight, inexpensive electronic and photographic instrument developed for detection, monitoring, and objective quantification of ocular/systemic disease or physiological alterations of retina, blood vessels, or other structures in anterior and posterior chambers of eye. Operated with little training. Functions with human or animal subject seated, recumbent, inverted, or in almost any other orientation; and in hospital, laboratory, field, or other environment. Produces video images viewed directly and/or digitized for simultaneous or subsequent analysis. Also equipped to produce photographs and/or fitted with adaptors to produce stereoscopic or magnified images of skin, nose, ear, throat, or mouth to detect lesions or diseases.

  1. Digital simulation of staining in histopathology multispectral images: enhancement and linear transformation of spectral transmittance.

    PubMed

    Bautista, Pinky A; Yagi, Yukako

    2012-05-01

    Hematoxylin and eosin (H&E) stain is currently the most popular for routine histopathology staining. Special and/or immuno-histochemical (IHC) staining is often requested to further corroborate the initial diagnosis on H&E stained tissue sections. Digital simulation of staining (or digital staining) can be a very valuable tool to produce the desired stained images from the H&E stained tissue sections instantaneously. We present an approach to digital staining of histopathology multispectral images by combining the effects of spectral enhancement and spectral transformation. Spectral enhancement is accomplished by shifting the N-band original spectrum of the multispectral pixel with the weighted difference between the pixel's original and estimated spectrum; the spectrum is estimated using M < N principal component (PC) vectors. The pixel's enhanced spectrum is transformed to the spectral configuration associated to its reaction to a specific stain by utilizing an N × N transformation matrix, which is derived through application of least mean squares method to the enhanced and target spectral transmittance samples of the different tissue components found in the image. Results of our experiments on the digital conversion of an H&E stained multispectral image to its Masson's trichrome stained equivalent show the viability of the method.

  2. Digital simulation of staining in histopathology multispectral images: enhancement and linear transformation of spectral transmittance

    NASA Astrophysics Data System (ADS)

    Bautista, Pinky A.; Yagi, Yukako

    2012-05-01

    Hematoxylin and eosin (H&E) stain is currently the most popular for routine histopathology staining. Special and/or immuno-histochemical (IHC) staining is often requested to further corroborate the initial diagnosis on H&E stained tissue sections. Digital simulation of staining (or digital staining) can be a very valuable tool to produce the desired stained images from the H&E stained tissue sections instantaneously. We present an approach to digital staining of histopathology multispectral images by combining the effects of spectral enhancement and spectral transformation. Spectral enhancement is accomplished by shifting the N-band original spectrum of the multispectral pixel with the weighted difference between the pixel's original and estimated spectrum; the spectrum is estimated using M < N principal component (PC) vectors. The pixel's enhanced spectrum is transformed to the spectral configuration associated to its reaction to a specific stain by utilizing an N × N transformation matrix, which is derived through application of least mean squares method to the enhanced and target spectral transmittance samples of the different tissue components found in the image. Results of our experiments on the digital conversion of an H&E stained multispectral image to its Masson's trichrome stained equivalent show the viability of the method.

  3. Digital enhancement of multispectral MSS data for maximum image visibility

    NASA Technical Reports Server (NTRS)

    Algazi, V. R.

    1973-01-01

    A systematic approach to the enhancement of images has been developed. This approach exploits two principal features involved in the observation of images: the properties of human vision and the statistics of the images being observed. The rationale of the enhancement procedure is as follows: in the observation of some features of interest in an image, the range of objective luminance-chrominance values being displayed is generally limited and does not use the whole perceptual range of vision of the observer. The purpose of the enhancement technique is to expand and distort in a systematic way the grey scale values of each of the multispectral bands making up a color composite, to enhance the average visibility of the features being observed.

  4. Multispectral data restoration study. [digital correction of LANDSAT geographic data

    NASA Technical Reports Server (NTRS)

    Shah, N. J.; Wilson, C. L.

    1977-01-01

    A digital resampling technique for LANDSAT data is reported that incorporates a deconvolution concept to minimize spatial and radiometric degradation of data during resampling for geometric correction. A quantitative comparison of cubic convolution and digital restoration methods establishes the latter as the superior technique.

  5. Facilitating Digital Video Production in the Language Arts Curriculum

    ERIC Educational Resources Information Center

    McKenney, Susan; Voogt, Joke

    2011-01-01

    Two studies were conducted to facilitate the development of feasible support for the process of integrating digital video making activities in the primary school language arts curriculum. The first study explored which teaching supports would be necessary to enable primary school children to create digital video as a means of fostering…

  6. Digital Video of Live-Scan Fingerprint Data

    National Institute of Standards and Technology Data Gateway

    NIST Digital Video of Live-Scan Fingerprint Data (PC database for purchase)   NIST Special Database 24 contains MPEG-2 (Moving Picture Experts Group) compressed digital video of live-scan fingerprint data. The database is being distributed for use in developing and testing of fingerprint verification systems.

  7. Promoting Independent Learning Skills Using Video on Digital Language Laboratories

    ERIC Educational Resources Information Center

    Wagener, Debbie

    2006-01-01

    The paper examines the potential for developing independent learning skills using the digital language laboratory with particular reference to exploiting the increasingly available resource of digital video. It investigates the potential for recording and editing video clips from online sources and digitalising clips from analogue recordings and…

  8. Digital Video for Multimedia, What Are the Alternatives?

    ERIC Educational Resources Information Center

    Sykes, David; Swinscoe, Paul C.

    1995-01-01

    Compares methods of providing digital video in computer-based training. A tabulation of performance, quality, and cost is provided, and techniques of compression and decompression are described together with hardware and/or software needs. Networking digital video, and the impact of emerging standards on the development of future products are also…

  9. The Use of Digital Video in Physical Education

    ERIC Educational Resources Information Center

    Weir, Tony; Connor, Sean

    2009-01-01

    This paper details the technical and operational aspects of a project investigating the role of digital video in physical education in 12 Irish schools over a period of two academic years. The project design involved a qualitative investigation into the use of digital video in three areas of physical education, namely teaching, learning and…

  10. The Use of Digital Video in Physical Education

    ERIC Educational Resources Information Center

    Weir, Tony; Connor, Sean

    2009-01-01

    This paper details the technical and operational aspects of a project investigating the role of digital video in physical education in 12 Irish schools over a period of two academic years. The project design involved a qualitative investigation into the use of digital video in three areas of physical education, namely teaching, learning and…

  11. The Applicability of Digital Video to Computerized Language Learning.

    ERIC Educational Resources Information Center

    Boyadjieff, Kiril; Poulin, Gerald

    1997-01-01

    Investigated the capabilities of the Intel's latest video capture board, the Intel Smart Video Recorder Pro. The study provides information about the capabilities of various CD-ROM drives in handling audiovisual files. The final outcome of this study was an objective assessment of the applicability of today's digital video for the purpose of…

  12. The Applicability of Digital Video to Computerized Language Learning.

    ERIC Educational Resources Information Center

    Boyadjieff, Kiril; Poulin, Gerald

    1997-01-01

    Investigated the capabilities of the Intel's latest video capture board, the Intel Smart Video Recorder Pro. The study provides information about the capabilities of various CD-ROM drives in handling audiovisual files. The final outcome of this study was an objective assessment of the applicability of today's digital video for the purpose of…

  13. Digital video delivery for a digital library in computer science

    NASA Astrophysics Data System (ADS)

    Fox, Edward A.; Abdulla, Ghaleb

    1994-04-01

    With support from four NSF awards we aim to develop a prototype digital library in computer science and apply it to improve undergraduate educations. First, Project Envision, `A User- Centered Database from the Computer Science Literature,' 1991-94, deals with translation, coding standards including SGML, retrieval/previewing/presentation/browsing/linking, human-computer interaction, and construction of a partial archive using text and multimedia materials provided by ACM. Second, `Interactive Learning with a Digital Library in Computer Science,' 1993-96, supported by NSF and ACM with additional assistance from other publishers, focuses on improving learning through delivery of materials from the archive. Third, `Networked Multimedia File System with HyTime,' funded by NSF through the SUCCEED coalition, considers networking support for distributed multimedia applications and the use of HyTime for description of such applications. Fourth, equipment support comes from the Information Access Laboratory allotment of the `Interactive Accessibility: Breaking Barriers to the Power of Computing' grant funded by NSF for 1993-98. In this paper we report on plans and work with digital video relating to these projects. In particular we focus on our analysis of the requirements for a multimedia digital library in computer science and our experience with MPEG as it applies to that library.

  14. Second-harmonic illumination to enhance multispectral digital lensless holographic microscopy.

    PubMed

    Mendoza-Yero, Omel; Carbonell-Leal, Miguel; Lancis, Jesús; Garcia-Sucerquia, Jorge

    2016-03-01

    Multispectral digital lensless holographic microscopy (MDLHM) operating with second-harmonic illumination is shown. Added to the improvement of the spatial resolution of the previously reported MDLHM operating with near-infrared illumination, this second-harmonic MDLHM shows promise as a tool to study the behavior of biological samples under a broad spectral illumination. This illumination is generated by focusing a highly spatially coherent ultrashort pulsed radiation into an uncoated Type 1 β-BaB2O4 (BBO) nonlinear crystal. The second-harmonic MDLHM allows achieving multispectral images of biological samples with enhanced micrometer spatial resolution. The illumination wavelength of the second-harmonic MDLHM can be tuned by displacing a focusing optics with respect to a pinhole; spatially resolved information at different wavelengths of the sample can then be retrieved.

  15. Part Two: Learning Science Through Digital Video: Student Views on Watching and Creating Videos

    NASA Astrophysics Data System (ADS)

    Wade, P.; Courtney, A. R.

    2014-12-01

    The use of digital video for science education has become common with the wide availability of video imagery. This study continues research into aspects of using digital video as a primary teaching tool to enhance student learning in undergraduate science courses. Two survey instruments were administered to undergraduate non-science majors. Survey One focused on: a) What science is being learned from watching science videos such as a "YouTube" clip of a volcanic eruption or an informational video on geologic time and b) What are student preferences with regard to their learning (e.g. using video versus traditional modes of delivery)? Survey Two addressed students' perspectives on the storytelling aspect of the video with respect to: a) sustaining interest, b) providing science information, c) style of video and d) quality of the video. Undergraduate non-science majors were the primary focus group in this study. Students were asked to view video segments and respond to a survey focused on what they learned from the segments. The storytelling aspect of each video was also addressed by students. Students watched 15-20 shorter (3-15 minute science videos) created within the last four years. Initial results of this research support that shorter video segments were preferred and the storytelling quality of each video related to student learning.

  16. Digital video microscopy in the Millikan oil-drop experiment

    NASA Astrophysics Data System (ADS)

    Silva, Kenneth J.; Mahendra, Jacquelyn C.

    2005-08-01

    We report on the ease and efficacy of using digital video microscopy techniques and computer software for analyzing data from the Millikan oil-drop experiment in an introductory physics laboratory course setting with applications for more advanced laboratories.

  17. A digital audio/video interleaving system. [for Shuttle Orbiter

    NASA Technical Reports Server (NTRS)

    Richards, R. W.

    1978-01-01

    A method of interleaving an audio signal with its associated video signal for simultaneous transmission or recording, and the subsequent separation of the two signals, is described. Comparisons are made between the new audio signal interleaving system and the Skylab Pam audio/video interleaving system, pointing out improvements gained by using the digital audio/video interleaving system. It was found that the digital technique is the simplest, most effective and most reliable method for interleaving audio and/or other types of data into the video signal for the Shuttle Orbiter application. Details of the design of a multiplexer capable of accommodating two basic data channels, each consisting of a single 31.5-kb/s digital bit stream are given. An adaptive slope delta modulation system is introduced to digitize audio signals, producing a high immunity of work intelligibility to channel errors, primarily due to the robust nature of the delta-modulation algorithm.

  18. Digital terrain mapping from multispectral and high-resolution satellite data for defense studies

    NASA Astrophysics Data System (ADS)

    Pandey, Suraj

    2007-04-01

    Multi spectral and high resolution satellite imageries enhancing their resolution capabilities in terms of spatial and spectral reflectance time to time such as LANDSAT, IRS, IKONOS and Digital Globe, these imageries are being used effectively and efficiently in certain applications, whereas to register spectral reflectance in different channels of electromagnetic spectrum is the principal characteristic of multi spectral satellite imageries. The real time nature of remotely sensed data can be of high value for mapping and analyzing surface features. This paper explores the broader application of remote sensing analysis for terrain mapping from multi-spectral satellite data, the accuracy of digital elevation model has been verified from various surface interpolation algorithms in which contouring and point interpolation techniques were extensively used. The study reveals that digital interpretation has become more sharpened on a large scale and terrain mapping with high and multi-spectral satellite data along with GPS Mobile Mapper can be done for any region, on some extent this research work has confirmed that sensor on a satellite can navigate army movements.

  19. The MIDAS processor. [Multivariate Interactive Digital Analysis System for multispectral scanner data

    NASA Technical Reports Server (NTRS)

    Kriegler, F. J.; Gordon, M. F.; Mclaughlin, R. H.; Marshall, R. E.

    1975-01-01

    The MIDAS (Multivariate Interactive Digital Analysis System) processor is a high-speed processor designed to process multispectral scanner data (from Landsat, EOS, aircraft, etc.) quickly and cost-effectively to meet the requirements of users of remote sensor data, especially from very large areas. MIDAS consists of a fast multipipeline preprocessor and classifier, an interactive color display and color printer, and a medium scale computer system for analysis and control. The system is designed to process data having as many as 16 spectral bands per picture element at rates of 200,000 picture elements per second into as many as 17 classes using a maximum likelihood decision rule.

  20. Pollution detection by digital correlation of multispectral, stero-image pairs.

    NASA Technical Reports Server (NTRS)

    Krause, F. R.; Betz, H. T.; Lysobey, D. H.

    1971-01-01

    Remote detection of air pollution circulation patterns is proposed to eventually predict the accumulation of hazardous surface concentrations in time for preventive emission control operations. Earth observations from space platforms will contain information on the height, mean velocity and lateral mixing scales of inversion layers and pollution plumes. Although this information is often not visible on photographs, it could conceivably be retrieved through a digital cross-correlation of multispectral stereo image pairs. Laboratory and field test results are used to illustrate the detection of non-visual inversion layers, the reduction of dominant signal interference, and the spectroscopic identification of combustion products.

  1. Promoting Equity with Digital Video. In the Curriculum: Science

    ERIC Educational Resources Information Center

    Yerrick, Randy; Ross, Donna; Molebash, Philip

    2004-01-01

    The relatively new technology of digital video editing addresses specific perplexing issues in science education by authentically engaging children in science through their roles as writers, directors, and editors of their own video productions. We discuss how to shine new light on difficult science concepts while also engaging all students in…

  2. XSLT for Tailored Access to a Digital Video Library.

    ERIC Educational Resources Information Center

    Christel, Michael G.; Maher, Bryan; Begun, Andrew

    The Informedia Project at Carnegie Mellon University has created a multi-terabyte digital video library consisting of thousands of hours of video, segmented into over 50,000 stories, or documents. Since Informedia's inception in 1994, numerous interfaces have been developed and tested for accessing this library, including work on multimedia…

  3. Combining multi-spectral proximal sensors and digital cameras for monitoring grazed tropical pastures

    NASA Astrophysics Data System (ADS)

    Handcock, R. N.; Gobbett, D. L.; González, L. A.; Bishop-Hurley, G. J.; McGavin, S. L.

    2015-11-01

    Timely and accurate monitoring of pasture biomass and ground-cover is necessary in livestock production systems to ensure productive and sustainable management of forage for livestock. Interest in the use of proximal sensors for monitoring pasture status in grazing systems has increased, since such sensors can return data in near real-time, and have the potential to be deployed on large properties where remote sensing may not be suitable due to issues such as spatial scale or cloud cover. However, there are unresolved challenges in developing calibrations to convert raw sensor data to quantitative biophysical values, such as pasture biomass or vegetation ground-cover, to allow meaningful interpretation of sensor data by livestock producers. We assessed the use of multiple proximal sensors for monitoring tropical pastures with a pilot deployment of sensors at two sites on Lansdown Research Station near Townsville, Australia. Each site was monitored by a Skye SKR-four-band multi-spectral sensor (every 1 min), a digital camera (every 30 min), and a soil moisture sensor (every 1 min), each operated over 18 months. Raw data from each sensor were processed to calculate a number of multispectral vegetation indices. Visual observations of pasture characteristics, including above-ground standing biomass and ground cover, were made every 2 weeks. A methodology was developed to manage the sensor deployment and the quality control of the data collected. The data capture from the digital cameras was more reliable than the multi-spectral sensors, which had up to 63 % of data discarded after data cleaning and quality control. We found a strong relationship between sensor and pasture measurements during the wet season period of maximum pasture growth (January to April), especially when data from the multi-spectral sensors were combined with weather data. RatioNS34 (a simple band ratio between the near infrared (NIR) and lower shortwave infrared (SWIR) bands) and rainfall since 1

  4. Research on enhancing the utilization of digital multispectral data and geographic information systems in global habitability studies

    NASA Technical Reports Server (NTRS)

    Martinko, Edward A.; Merchant, James W.

    1988-01-01

    During 1986 to 1987, the Kansas Applied Remote Sensing (KARS) Program continued to build upon long-term research efforts oriented towards enhancement and development of technologies for using remote sensing in the inventory and evaluation of land use and renewable resources (both natural and agricultural). These research efforts directly addressed needs and objectives of NASA's Land-Related Global Habitability Program as well as needs of and interests of public agencies and private firms. The KARS Program placed particular emphasis on two major areas: development of intelligent algorithms to improve automated classification of digital multispectral data; and integrating and merging digital multispectral data with ancillary data in spatial modes.

  5. Digital Audio Sampling for Film and Video.

    ERIC Educational Resources Information Center

    Stanton, Michael J.

    Digital audio sampling is explained, and some of its implications in digital sound applications are discussed. Digital sound equipment is rapidly replacing analog recording devices as the state-of-the-art in audio technology. The philosophy of digital recording involves doing away with the continuously variable analog waveforms and turning the…

  6. Embodied Memory and Curatorship in Children's Digital Video Production

    ERIC Educational Resources Information Center

    Potter, John

    2010-01-01

    Digital video production in schools is often theorised, researched and written about in two ways: either as a part of media studies practice or as a technological innovation, bringing new, "creative", digital tools into the curriculum. Using frameworks for analysis derived from multimodality theory, new literacy studies and theories of…

  7. Discrimination of geological features using digital and photographic enhancements of Landsat multispectral scanner data

    NASA Astrophysics Data System (ADS)

    El Shazly, H.

    A variety of techniques for optically and digitally processing the Landsat multispectral scanner data were applied to scence number 1109-07493 of the Gulf of Suez Area. The results of each of these techniques were compared in order to assess the usefulness of each technique in the interpretation of the Landsat images. The best overall results for this scene were achieved using optically enhanced digital images. The high-bandpass color-infrared image was nearly as good. The intensity, hue and saturation images showed increased contrast between the various geological units, but lacked the fine detail necessary for certain aspects of geological interpretation. These results should equally apply to images of similar ground features but will probably differ when the features are significantly different.

  8. Multispectral digital lensless holographic microscopy: from femtosecond laser to white light LED

    NASA Astrophysics Data System (ADS)

    Garcia-Sucerquia, J.

    2015-04-01

    The use of femtosecond laser radiation and super bright white LED in digital lensless holographic microscopy is presented. For the ultrafast laser radiation two different configurations of operation of the microscope are presented and the dissimilar performance of each one analyzed. The microscope operating with a super bright white light LED in combination with optical filters shows very competitive performance as it is compared with more expensive optical sources. The broadband emission of both radiation sources allows the multispectral imaging of biological samples to obtain spectral responses and/or full color images of the microscopic specimens; sections of the head of a Drosophila melanogaster fly are imaged in this contribution. The simple, solid, compact, lightweight, and reliable architecture of digital lensless holographic microscopy operating with broadband light sources to image biological specimens exhibiting micrometer-sized details is evaluated in the present contribution.

  9. Learning Science Through Digital Video: Views on Watching and Creating Videos

    NASA Astrophysics Data System (ADS)

    Wade, P.; Courtney, A. R.

    2013-12-01

    In science, the use of digital video to document phenomena, experiments and demonstrations has rapidly increased during the last decade. The use of digital video for science education also has become common with the wide availability of video over the internet. However, as with using any technology as a teaching tool, some questions should be asked: What science is being learned from watching a YouTube clip of a volcanic eruption or an informational video on hydroelectric power generation? What are student preferences (e.g. multimedia versus traditional mode of delivery) with regard to their learning? This study describes 1) the efficacy of watching digital video in the science classroom to enhance student learning, 2) student preferences of instruction with regard to multimedia versus traditional delivery modes, and 3) the use of creating digital video as a project-based educational strategy to enhance learning. Undergraduate non-science majors were the primary focus group in this study. Students were asked to view video segments and respond to a survey focused on what they learned from the segments. Additionally, they were asked about their preference for instruction (e.g. text only, lecture-PowerPoint style delivery, or multimedia-video). A majority of students indicated that well-made video, accompanied with scientific explanations or demonstration of the phenomena was most useful and preferred over text-only or lecture instruction for learning scientific information while video-only delivery with little or no explanation was deemed not very useful in learning science concepts. The use of student generated video projects as learning vehicles for the creators and other class members as viewers also will be discussed.

  10. Digital audio and video broadcasting by satellite

    NASA Astrophysics Data System (ADS)

    Yoshino, Takehiko

    In parallel with the progress of the practical use of satellite broadcasting and Hi-Vision or high-definition television technologies, research activities are also in progress to replace the conventional analog broadcasting services with a digital version. What we call 'digitalization' is not a mere technical matter but an important subject which will help promote multichannel or multimedia applications and, accordingly, can change the old concept of mass media, such as television or radio. NHK Science and Technical Research Laboratories has promoted studies of digital bandwidth compression, transmission, and application techniques. The following topics are covered: the trend of digital broadcasting; features of Integrated Services Digital Broadcasting (ISDB); compression encoding and transmission; transmission bit rate in 12 GHz band; number of digital TV transmission channels; multichannel pulse code modulation (PCM) audio broadcasting system via communication satellite; digital Hi-Vision broadcasting; and development of digital audio broadcasting (DAB) for mobile reception in Japan.

  11. Utilization of KSC Present Broadband Communications Data System for Digital Video Services

    NASA Technical Reports Server (NTRS)

    Andrawis, Alfred S.

    2002-01-01

    This report covers a visibility study of utilizing present KSC broadband communications data system (BCDS) for digital video services. Digital video services include compressed digital TV delivery and video-on-demand. Furthermore, the study examines the possibility of providing interactive video on demand to desktop personal computers via KSC computer network.

  12. Utilization of KSC Present Broadband Communications Data System For Digital Video Services

    NASA Technical Reports Server (NTRS)

    Andrawis, Alfred S.

    2001-01-01

    This report covers a visibility study of utilizing present KSC broadband communications data system (BCDS) for digital video services. Digital video services include compressed digital TV delivery and video-on-demand. Furthermore, the study examines the possibility of providing interactive video on demand to desktop personal computers via KSC computer network.

  13. Utilization of KSC Present Broadband Communications Data System for Digital Video Services

    NASA Technical Reports Server (NTRS)

    Andrawis, Alfred S.

    2002-01-01

    This report covers a visibility study of utilizing present KSC broadband communications data system (BCDS) for digital video services. Digital video services include compressed digital TV delivery and video-on-demand. Furthermore, the study examines the possibility of providing interactive video on demand to desktop personal computers via KSC computer network.

  14. Utilization of KSC Present Broadband Communications Data System For Digital Video Services

    NASA Technical Reports Server (NTRS)

    Andrawis, Alfred S.

    2001-01-01

    This report covers a visibility study of utilizing present KSC broadband communications data system (BCDS) for digital video services. Digital video services include compressed digital TV delivery and video-on-demand. Furthermore, the study examines the possibility of providing interactive video on demand to desktop personal computers via KSC computer network.

  15. Digital video technology - today and tomorrow: 11th office information technology conference

    SciTech Connect

    Liberman, J.

    1994-10-01

    Digital video is probably computing`s fastest moving technology today. Just three years ago, the zenith of digital video technology on the PC was the successful marriage of digital text and graphics with analog audio and video by means of expensive analog laser disc players and video overlay boards. The state of the art involves two different approaches to fully digital video on computers: hardware-assisted and software-only solutions.

  16. Documentation of surgical specimens using digital video technology.

    PubMed

    Melín-Aldana, Héctor; Carter, Barbara; Sciortino, Debra

    2006-09-01

    Digital technology is commonly used for documentation of specimens in anatomic pathology and has been mainly limited to still photographs. Technologic innovations, such as digital video, provide additional, in some cases better, options for documentation. To demonstrate the applicability of digital video to the documentation of surgical specimens. A Canon Elura MC40 digital camcorder was used, and the unedited movies were transferred to a Macintosh PowerBook G4 computer. Both the camcorder and specimens were hand-held during filming. The movies were edited using the software iMovie. Annotations and histologic photographs may be easily incorporated into movies when editing, if desired. The finished movies are best viewed in computers which contain the free program QuickTime Player. Movies may also be incorporated onto DVDs, for viewing in standard DVD players or appropriately equipped computers. The final movies are on average 2 minutes in duration, with a file size between 2 and 400 megabytes, depending on the intended use. Because of file size, distribution is more practical via CD or DVD, but movies may be compressed for distribution through the Internet (e-mail, Web sites) or through internal hospital networks. Digital video is a practical, easy, and affordable methodology for specimen documentation, permitting a better 3-dimensional understanding of the specimens. Discussions with colleagues, student education, presentation at conferences, and other educational activities can be enhanced with the implementation of digital video technology.

  17. Perceptual watermarks for digital images and video

    NASA Astrophysics Data System (ADS)

    Wolfgang, Raymond B.; Podilchuk, Christine I.; Delp, Edward J., III

    1999-04-01

    The growth of new imaging technologies has created a need for techniques that can be used for copyright protection of digital images. One approach for copyright protection is to introduce an invisible signal known as a digital watermark in the image. In this paper, we describe digital image watermarking techniques known as perceptually watermarks that are designed to exploit aspects of the human visual system in order to produce a transparent, yet robust watermark.

  18. A comparison of two methods of analog-to-digital medical video conversion.

    PubMed

    Berges, G; Davidson, H C; Chapman, B; Cannon, G; Christian, M; Harnsberger, D; Harnsberger, H R

    2000-08-01

    The purpose of this study was to compare 2 methods of analog-to-digital video conversion in anticipation of improving, refining, and standardizing digital video production for medical education, diagnosis support, and telemedicine. A video workstation was devised containing 2 analog-to-digital video conversion systems: a digital video media converter with fire wire card and a video capture card. A procedure for final digital video production was created that used equivalent compression, pixel resolution, frame rate, and data rate for both systems. A subjective test was performed in which 12 archived analog videotapes, consisting of magnetic resonance angiograms, ultrasounds, neurosurgeries, and telemedicine applications, were converted digitally using the 2 methods. Randomized side by side video comparisons were analyzed and rated by subjective quality. An objective test was performed by videotaping a gray-scale test pattern off a computer monitor, digitally converting it by the 2 methods, and comparing the gray-scale values to the original pattern. There was no significant difference in overall video quality (P = .31) or grayscale reproduction using the 2 methods of analog-to-digital conversion. When performing simple analog-to-digital video conversion, a video capture card is equal in quality and costs less than a digital video (DV) media converter or fire wire card. If a digital video camera is available for use, then a DV media converter or fire wire card is more advantageous because it enables full operation of the digital video camera.

  19. Evaluation of multispectral, fine scale digital imagery as a tool for mapping stream morphology

    NASA Astrophysics Data System (ADS)

    Wright, Andrea; Marcus, W. Andrew; Aspinall, Richard

    2000-05-01

    Multispectral digital imagery acquired from Soda Butte and Cache Creeks, Montana and Wyoming was used in conjunction with field data to classify and map hydrogeomorphic stream units on four stream reaches. The morphologic units that were field mapped were eddy drop zones, glides, low gradient riffles, high gradient riffles, lateral scour pools, attached bars, detached bars, and large woody debris. Unsupervised and supervised classifications of the imagery were used to develop a Maximum Joint Probability classification and an Alternative Joint Probability classification of the stream reaches. The Maximum Joint Probability classification allowed only one of the image classes to represent each hydrogeomorphic unit on the field map and resulted in relatively low overall accuracies for identification of these units of 10% to 50%. The Alternative Joint Probability classification allowed each image class to represent any geomorphic unit where the probability of a correct classification was greater than random. In this technique, two or three image classes were assigned to represent each hydrogeomorphic unit, resulting in higher overall accuracies of 28% to 80%. Accurate classification of hydrogeomorphic units was hampered by poor rectification of imagery with the field maps because of inadequate ground control points. In general, the largest hydrogeomorphic units were most accurately classified, whereas units that were small in area or spatially linear were least likely to be accurately classified. The results of this study demonstrated that multispectral digital imagery has the potential to be a useful tool for mapping hydrogeomorphic stream units at fine scales. Imagery to be an effective tool, however, careful measures such as accurate documentation of ground control points must be taken to ensure accurate rectification of the imagery with field maps.

  20. Near-infrared video projection system based on digital micromirror devices and digital signal processors

    NASA Astrophysics Data System (ADS)

    Khalifa, Aly A.; Aly, Hussein A.

    2015-12-01

    We designed and developed a system to project video scenes in the near-infrared (NIR) band based on digital micromirror devices (DMD) and digital signal processors (DSP). The system deals with the integration and interfacing of different embedded systems both in the field of digital light processing (DLP) and digital signal processing. On the DLP side, we integrated DMD, NIR light source, and projection optics. The input video source for the dynamic scene was generated using a DSP, where we designed and implemented a fast video-retrieval algorithm. The proposed system can be used for testing and design of equipments operating in the NIR band. The system is tested for projecting NIR video at different projection distances using different driving powers of the NIR laser source, and it operated correctly and was capable of producing high frame rate of 180 frames per second (fps) without delay or distortion when viewed by an NIR camera.

  1. Cassini's Digital Video Disk is on display in the PHSF

    NASA Technical Reports Server (NTRS)

    1997-01-01

    In the Payload Hazardous Servicing Facility (PHSF), a Digital Video Disk (DVD) bearing 616,400 digitized signatures of people from nations around the world is attached to the Cassini spacecraft and will soon to be on its way to Saturn. The Cassini spacecraft is scheduled for launch on an Air Force Titan IV/Centaur launch vehicle on Oct. 6, 1997, and is destined to arrive at Saturn in July 2004.

  2. A Web-Based Video Digitizing System for the Study of Projectile Motion.

    ERIC Educational Resources Information Center

    Chow, John W.; Carlton, Les G.; Ekkekakis, Panteleimon; Hay, James G.

    2000-01-01

    Discusses advantages of a video-based, digitized image system for the study and analysis of projectile motion in the physics laboratory. Describes the implementation of a web-based digitized video system. (WRM)

  3. A Web-Based Video Digitizing System for the Study of Projectile Motion.

    ERIC Educational Resources Information Center

    Chow, John W.; Carlton, Les G.; Ekkekakis, Panteleimon; Hay, James G.

    2000-01-01

    Discusses advantages of a video-based, digitized image system for the study and analysis of projectile motion in the physics laboratory. Describes the implementation of a web-based digitized video system. (WRM)

  4. Using a Digital Video Camera to Study Motion

    ERIC Educational Resources Information Center

    Abisdris, Gil; Phaneuf, Alain

    2007-01-01

    To illustrate how a digital video camera can be used to analyze various types of motion, this simple activity analyzes the motion and measures the acceleration due to gravity of a basketball in free fall. Although many excellent commercially available data loggers and software can accomplish this task, this activity requires almost no financial…

  5. Digital Video: Watch Me Do What I Say!

    ERIC Educational Resources Information Center

    Capraro, Robert M.; Capraro, Mary Margaret; Lamb, Charles E.

    This paper establishes a use for digital video in developing preservice teacher metacognition about the teaching process using a lesson plan-rating sheet as a guide. A lesson plan was developed to meet the specific needs of the methods instructors in a professional development program at a large public institution. The categories listed on the…

  6. Using a Digital Video Camera to Study Motion

    ERIC Educational Resources Information Center

    Abisdris, Gil; Phaneuf, Alain

    2007-01-01

    To illustrate how a digital video camera can be used to analyze various types of motion, this simple activity analyzes the motion and measures the acceleration due to gravity of a basketball in free fall. Although many excellent commercially available data loggers and software can accomplish this task, this activity requires almost no financial…

  7. Composing with New Technology: Teacher Reflections on Learning Digital Video

    ERIC Educational Resources Information Center

    Bruce, David L.; Chiu, Ming Ming

    2015-01-01

    This study explores teachers' reflections on their learning to compose with new technologies in the context of teacher education and/or teacher professional development. English language arts (ELA) teachers (n = 240) in 15 courses learned to use digital video (DV), completed at least one DV group project, and responded to open-ended survey…

  8. Digital Video as Research Practice: Methodology for the Millennium

    ERIC Educational Resources Information Center

    Shrum, Wesley; Duque, Ricardo; Brown, Timothy

    2005-01-01

    This essay has its origin in a project on the globalization of science that rediscovered the wisdom of past research practices through the technology of the future. The main argument of this essay is that a convergence of digital video technologies with practices of social surveillance portends a methodological shift towards a new variety of…

  9. Silent Movies: A Digitized Video Approach to the Russian Verb.

    ERIC Educational Resources Information Center

    Frumkes, Lisa A.

    A HyperCard stack using digitized video to provide students of Russian with meaningful exercise in the use of verbal aspect and verbs of motion and position is described. Several problems presented by the Russian verb are defined. Examples of traditional textbook exercises are presented--translations, fill-ins, and picture-based approaches, and…

  10. Indigenous Digital Storytelling in Video: Witnessing with Alma Desjarlais

    ERIC Educational Resources Information Center

    Iseke, Judy M.

    2011-01-01

    Indigenous digital storytelling in video is a way of witnessing the stories of Indigenous communities and Elders, including what has happened and is happening in the lives and work of Indigenous peoples. Witnessing includes acts of remembrance in which we look back to reinterpret and recreate our relationship to the past in order to understand the…

  11. Social Justice through Literacy: Integrating Digital Video Cameras in Reading Summaries and Responses

    ERIC Educational Resources Information Center

    Liu, Rong; Unger, John A.; Scullion, Vicki A.

    2014-01-01

    Drawing data from an action-oriented research project for integrating digital video cameras into the reading process in pre-college courses, this study proposes using digital video cameras in reading summaries and responses to promote critical thinking and to teach social justice concepts. The digital video research project is founded on…

  12. Digital Video and Writing with Priority Learners

    ERIC Educational Resources Information Center

    Diglin, Peter

    2016-01-01

    Digital technology has become more ubiquitous in classrooms across the western world. Literacy learning is topical in New Zealand education under the umbrella of the current National Standards policy, a policy introduced on the basis of rhetoric around improving achievement for priority learners. The study presented in this paper would then appear…

  13. Development of a multispectral active stereo vision system for video surveillance applications

    NASA Astrophysics Data System (ADS)

    Kumar, Sanjeev; Balasubramanian, R.

    2014-03-01

    In this paper, a multispectral active stereo vision system is developed for tracking the motion of moving objects in different environment. The development of such a multispectral surveillance system composed by combining visible(color) and infrared sensors. The aim is to behind proposing such a network of visible and thermal sensors is to give an optimal performance in various weather conditions (foggy, snowing, dark and rainy) and increase the detection performance. The detection of moving objects is performed by mean of the optical flow between the images of two different spectrum. The optical flow has been computed by formulating an energy minimization problem and subsequently solving it by a numerical optimization algorithm. The convergence of the numerical scheme is given in case of different images. Finally, a number of experimental results (optical flow from stereo images) are given to prove the applicability of such a system in various applications and situations where a robust surveillance and tracking system is needed.

  14. Estimation of absolute water surface temperature based on atmospherically corrected thermal infrared multispectral scanner digital data

    NASA Technical Reports Server (NTRS)

    Anderson, James E.

    1986-01-01

    Airborne remote sensing systems, as well as those on board Earth orbiting satellites, sample electromagnetic energy in discrete wavelength regions and convert the total energy sampled into data suitable for processing by digital computers. In general, however, the total amount of energy reaching a sensor system located at some distance from the target is composed not only of target related energy, but, in addition, contains a contribution originating from the atmosphere itself. Thus, some method must be devised for removing or at least minimizing the effects of the atmosphere. The LOWTRAN-6 Program was designed to estimate atmospheric transmittance and radiance for a given atmospheric path at moderate spectral resolution over an operational wavelength region from 0.25 to 28.5 microns. In order to compute the Thermal Infrared Multispectral Scanner (TIMS) digital values which were recorded in the absence of the atmosphere, the parameters derived from LOWTRAN-6 are used in a correction equation. The TIMS data were collected at 1:00 a.m. local time on November 21, 1983, over a recirculating cooling pond for a power plant in southeastern Mississippi. The TIMS data were analyzed before and after atmospheric corrections were applied using a band ratioing model to compute the absolute surface temperature of various points on the power plant cooling pond. The summarized results clearly demonstrate the desirability of applying atmospheric corrections.

  15. Detection of malevolent changes in digital video for forensic applications

    NASA Astrophysics Data System (ADS)

    Mondaini, N.; Caldelli, R.; Piva, A.; Barni, M.; Cappellini, V.

    2007-02-01

    In this paper we present a new method for the detection of forgeries in digital videos, using the sensor's pattern noise. The camera pattern noise is a unique stochastic high frequency characteristic of imaging sensors and the detection of a forged frame in a video is determined by comparing the correlation between the noise within the frame itself and the reference pattern noise with an empirical threshold. The reference pattern is created for the identification of the camera and the authentication of the video too. Such a pattern is defined as self building because it is created from the video sequence during the time develop, with a technique applied frame per frame, by averaging the noise extracted from each frame. The method has been inherited from an existing system created by Fridrich et al.1 for still images. By using this method we are able to identify if all the scenes of a video sequence have been taken with the same camera and if the number and/or the content of the frames of the video have been modified. A large section of the paper is dedicated to the experimental results, where we demonstrate that it is possible to perform a reliable identification even from video that has undergone MPEG compression or frame interpolation.

  16. Improved video documentation of endoscopic sinus surgery made possible with desktop digital video.

    PubMed

    Desrosiers, M; Craig, P

    1997-01-01

    Endoscopic cameras in endoscopic sinus surgery (ESS) allow for easy video documentation of surgery. This often leads to the build-up of extensive videocassette libraries where the prospective viewer is subjected to a lengthy and cumbersome videotape search before accessing a sequence of interest. Footage is difficult to use for educational purposes. New techniques for storing, retrieving, and presenting ESS video footage were developed. Desktop computer systems were used to digitize video footage. Short video sequences containing highlights of interesting ESS cases were prepared using video-editing programs. The resulting images were stored in individual segments on recordable CD-ROM disks. This technique was used to archive all video footage from our ESS procedures for a 6-month period. Archiving footage on CD-ROM rather than videotape has made the storage of large quantities of information possible while now allowing for the random access of segment(s) of interest. It has simplified preparation of video projects, reduced production time 10-fold and has eliminated the need for professional video-editing services. These techniques have also been adapted for the development of an educational CD-ROM demonstrating the component steps of ESS, which can be played back on any CD-ROM-equipped computer.

  17. Practical system for generating digital mixed reality video holograms.

    PubMed

    Song, Joongseok; Kim, Changseob; Park, Hanhoon; Park, Jong-Il

    2016-07-10

    We propose a practical system that can effectively mix the depth data of real and virtual objects by using a Z buffer and can quickly generate digital mixed reality video holograms by using multiple graphic processing units (GPUs). In an experiment, we verify that real objects and virtual objects can be merged naturally in free viewing angles, and the occlusion problem is well handled. Furthermore, we demonstrate that the proposed system can generate mixed reality video holograms at 7.6 frames per second. Finally, the system performance is objectively verified by users' subjective evaluations.

  18. Creating Orthographically Rectified Satellite Multi-Spectral Imagery with High Resolution Digital Elevation Model from LiDAR: A Tutorial

    DTIC Science & Technology

    2014-08-15

    Detection and Ranging (LiDAR) Digital Elevation Models (DEM) and from commercial satellite Multi-Spectral Imagery ( MSI ) in the National Imagery Transmis...processing the original MSI . This generic re- placement sensor model is provided with the distributed imagery to sim- plify the process of removing...The DEM and MSI also become better registered together after producing the orthoimage by using the RPC. This assists feature extraction and

  19. A pilot project combining multispectral proximal sensors and digital cameras for monitoring tropical pastures

    NASA Astrophysics Data System (ADS)

    Handcock, Rebecca N.; Gobbett, D. L.; González, Luciano A.; Bishop-Hurley, Greg J.; McGavin, Sharon L.

    2016-08-01

    Timely and accurate monitoring of pasture biomass and ground cover is necessary in livestock production systems to ensure productive and sustainable management. Interest in the use of proximal sensors for monitoring pasture status in grazing systems has increased, since data can be returned in near real time. Proximal sensors have the potential for deployment on large properties where remote sensing may not be suitable due to issues such as spatial scale or cloud cover. There are unresolved challenges in gathering reliable sensor data and in calibrating raw sensor data to values such as pasture biomass or vegetation ground cover, which allow meaningful interpretation of sensor data by livestock producers. Our goal was to assess whether a combination of proximal sensors could be reliably deployed to monitor tropical pasture status in an operational beef production system, as a precursor to designing a full sensor deployment. We use this pilot project to (1) illustrate practical issues around sensor deployment, (2) develop the methods necessary for the quality control of the sensor data, and (3) assess the strength of the relationships between vegetation indices derived from the proximal sensors and field observations across the wet and dry seasons. Proximal sensors were deployed at two sites in a tropical pasture on a beef production property near Townsville, Australia. Each site was monitored by a Skye SKR-four-band multispectral sensor (every 1 min), a digital camera (every 30 min), and a soil moisture sensor (every 1 min), each of which were operated over 18 months. Raw data from each sensor was processed to calculate multispectral vegetation indices. The data capture from the digital cameras was more reliable than the multispectral sensors, which had up to 67 % of data discarded after data cleaning and quality control for technical issues related to the sensor design, as well as environmental issues such as water incursion and insect infestations. We recommend

  20. Balloon-borne video cassette recorders for digital data storage

    NASA Technical Reports Server (NTRS)

    Althouse, W. E.; Cook, W. R.

    1985-01-01

    A high speed, high capacity digital data storage system was developed for a new balloon-borne gamma-ray telescope. The system incorporates economical consumer products: the portable video cassette recorder (VCR) and a relatively newer item - the digital audio processor. The in-flight recording system employs eight VCRs and will provide a continuous data storage rate of 1.4 megabits/sec throughout a 40 hour balloon flight. Data storage capacity is 25 gigabytes and power consumption is only 10 watts.

  1. Digitizing Standard & High Resolution High Frame Rate Video Camera Signals

    NASA Astrophysics Data System (ADS)

    Simmons, David M.

    1988-03-01

    The digitizing of an analog video camera signal requires special techniques to accurately sample the signal. Careful attention must be paid to both amplitude and timing considerations. Specifications exist which define amplitude and timing parame-ters of so called "standard" cameras. Recent advances in CCD technology have lead to the development of high resolution line scan and area cameras. Unfortunately these cameras do not con-form to any published standard. Hardware designed to digitize these "non-standard" cameras must have a flexible architecture to allow for each cameras' particular interface requirements.

  2. Absolute concentration measurements inside a jet plume using video digitization

    NASA Astrophysics Data System (ADS)

    Vauquelin, O.

    An experimental system based on digitized video image analysis is used to measure the local value of the concentration inside a plume. Experiments are carried out in a wind-tunnel for a smoke-seeded turbulent jet plume illuminated with a laser beam. Each test is filmed, subsequently video images are digitized and analysed in order to determine the smoke absolute concentration corresponding to each pixel gray level. This non-intrusive measurement technique is first calibrated and different laws connecting gray level to concentration are established. As a first application, concentration measurements are made inside a turbulent jet plume and compared with measurements conducted using a classic gas analysis method. We finally present and discuss the possibilities offered for the measurements of absolute concentration fluctuations.

  3. Digital holographic video for studies of plankton dynamics

    NASA Astrophysics Data System (ADS)

    Dyomin, V. V.; Olshukov, A. S.; Dzyuba, E. V.

    2011-01-01

    The procedure, capabilities, and applicability limits of digital holographic video for the determination of the velocity and reconstruction of the trajectory of motion of plankton species in the habitat are considered. Results of experimental investigations of zooplankton in laboratory conditions are presented. Two species that differ by the morphology and sizes are examined, including Epischura baicalensis for the trajectory construction and Daphnia magna for an experiment on dual-view hologram recording. The position of a plankton species in the examined volume is suggested to be determined based on the coordinates of the center of gravity of its holographic image. Preliminary results of recording of a dual-view digital holographic video of plankton species are discussed.

  4. Digital video steganalysis using motion vector recovery-based features.

    PubMed

    Deng, Yu; Wu, Yunjie; Zhou, Linna

    2012-07-10

    As a novel digital video steganography, the motion vector (MV)-based steganographic algorithm leverages the MVs as the information carriers to hide the secret messages. The existing steganalyzers based on the statistical characteristics of the spatial/frequency coefficients of the video frames cannot attack the MV-based steganography. In order to detect the presence of information hidden in the MVs of video streams, we design a novel MV recovery algorithm and propose the calibration distance histogram-based statistical features for steganalysis. The support vector machine (SVM) is trained with the proposed features and used as the steganalyzer. Experimental results demonstrate that the proposed steganalyzer can effectively detect the presence of hidden messages and outperform others by the significant improvements in detection accuracy even with low embedding rates.

  5. Statistical correction of lidar-derived digital elevation models with multispectral airborne imagery in tidal marshes

    USGS Publications Warehouse

    Buffington, Kevin J.; Dugger, Bruce D.; Thorne, Karen M.; Takekawa, John

    2016-01-01

    Airborne light detection and ranging (lidar) is a valuable tool for collecting large amounts of elevation data across large areas; however, the limited ability to penetrate dense vegetation with lidar hinders its usefulness for measuring tidal marsh platforms. Methods to correct lidar elevation data are available, but a reliable method that requires limited field work and maintains spatial resolution is lacking. We present a novel method, the Lidar Elevation Adjustment with NDVI (LEAN), to correct lidar digital elevation models (DEMs) with vegetation indices from readily available multispectral airborne imagery (NAIP) and RTK-GPS surveys. Using 17 study sites along the Pacific coast of the U.S., we achieved an average root mean squared error (RMSE) of 0.072 m, with a 40–75% improvement in accuracy from the lidar bare earth DEM. Results from our method compared favorably with results from three other methods (minimum-bin gridding, mean error correction, and vegetation correction factors), and a power analysis applying our extensive RTK-GPS dataset showed that on average 118 points were necessary to calibrate a site-specific correction model for tidal marshes along the Pacific coast. By using available imagery and with minimal field surveys, we showed that lidar-derived DEMs can be adjusted for greater accuracy while maintaining high (1 m) resolution.

  6. Use of digital multispectral videography to assess seagrass distribution in San Quintin Bay, Baja California, Mexico

    USGS Publications Warehouse

    Ward, D.H.; Tibbitts, T.L.; Morton, Alexandra; Carrera-Gonzalez, Eduardo; Kempka, R.

    2004-01-01

    Apparent threats to the spatial distribution of seagrass in San Quintín Bay prompted us to make a detailed assessment of habitats in the bay. Six coastal habitats and three seagrass subclasses were delineated using airborne digital multispectral videography (DMSV). Eelgrass, Zostera marina, was the predominant seagrass and covered 40% (1949 ha) of the areal extent of the bay in 1999. Eelgrass grew over a wide range of tidal depths from about –3.0 m mean lower low water (MLLW) to about 1.0 m MLLW, but greatest spatial extent occurred in intertidal areas –0.6 m to 1.0 m MLLW. Exposed-continuous (i.e., high density) eelgrass was the most abundant habitat in the bay. Widgeongrass, Ruppia maritima, was the only other seagrass present and covered 3% (136 ha) of the areal extent of the entire bay. Widgeongrass grew in single species stands in the upper intertidal (≥ 0.4 MLLW) and intermixed with eelgrass at lower tidal depths. Overall accuracy of the six habitat classes and three subclasses in the DMSV map was relatively high at 84%. Our detailed map of San Quintín Bay can be used in future change detection analyses to monitor the health of seagrasses in the bay.

  7. Correlation and registration of ERTS multispectral imagery. [by a digital processing technique

    NASA Technical Reports Server (NTRS)

    Bonrud, L. O.; Henrikson, P. J.

    1974-01-01

    Examples of automatic digital processing demonstrate the feasibility of registering one ERTS multispectral scanner (MSS) image with another obtained on a subsequent orbit, and automatic matching, correlation, and registration of MSS imagery with aerial photography (multisensor correlation) is demonstrated. Excellent correlation was obtained with patch sizes exceeding 16 pixels square. Qualities which lead to effective control point selection are distinctive features, good contrast, and constant feature characteristics. Results of the study indicate that more than 300 degrees of freedom are required to register two standard ERTS-1 MSS frames covering 100 by 100 nautical miles to an accuracy of 0.6 pixel mean radial displacement error. An automatic strip processing technique demonstrates 600 to 1200 degrees of freedom over a quater frame of ERTS imagery. Registration accuracies in the range of 0.3 pixel to 0.5 pixel mean radial error were confirmed by independent error analysis. Accuracies in the range of 0.5 pixel to 1.4 pixel mean radial error were demonstrated by semi-automatic registration over small geographic areas.

  8. Robust feedback zoom tracking for digital video surveillance.

    PubMed

    Zou, Tengyue; Tang, Xiaoqi; Song, Bao; Wang, Jin; Chen, Jihong

    2012-01-01

    Zoom tracking is an important function in video surveillance, particularly in traffic management and security monitoring. It involves keeping an object of interest in focus during the zoom operation. Zoom tracking is typically achieved by moving the zoom and focus motors in lenses following the so-called "trace curve", which shows the in-focus motor positions versus the zoom motor positions for a specific object distance. The main task of a zoom tracking approach is to accurately estimate the trace curve for the specified object. Because a proportional integral derivative (PID) controller has historically been considered to be the best controller in the absence of knowledge of the underlying process and its high-quality performance in motor control, in this paper, we propose a novel feedback zoom tracking (FZT) approach based on the geometric trace curve estimation and PID feedback controller. The performance of this approach is compared with existing zoom tracking methods in digital video surveillance. The real-time implementation results obtained on an actual digital video platform indicate that the developed FZT approach not only solves the traditional one-to-many mapping problem without pre-training but also improves the robustness for tracking moving or switching objects which is the key challenge in video surveillance.

  9. Qualitative and quantitative assessment of video transmitted by DVTS (digital video transport system) in surgical telemedicine.

    PubMed

    Shima, Yoichiro; Suwa, Akina; Gomi, Yuichiro; Nogawa, Hiroki; Nagata, Hiroshi; Tanaka, Hiroshi

    2007-01-01

    Real-time video pictures can be transmitted inexpensively via a broadband connection using the DVTS (digital video transport system). However, the degradation of video pictures transmitted by DVTS has not been sufficiently evaluated. We examined the application of DVTS to remote consultation by using images of laparoscopic and endoscopic surgeries. A subjective assessment by the double stimulus continuous quality scale (DSCQS) method of the transmitted video pictures was carried out by eight doctors. Three of the four video recordings were assessed as being transmitted with no degradation in quality. None of the doctors noticed any degradation in the images due to encryption by the VPN (virtual private network) system. We also used an automatic picture quality assessment system to make an objective assessment of the same images. The objective DSCQS values were similar to the subjective ones. We conclude that although the quality of video pictures transmitted by the DVTS was slightly reduced, they were useful for clinical purposes. Encryption with a VPN did not degrade image quality.

  10. Performance comparison of motion estimation algorithms on digital video images

    NASA Astrophysics Data System (ADS)

    Ali, N. A.; Ja'Afar, A. S.; Anathakrishnan, K. S.

    2009-12-01

    This paper presents a comparative study on technique to achieve high compression ratio in video coding. The focus is on the Block Matching Motion Estimation (BMME) techniques. It has been particularly used in various coding standards. In the BMME, search patterns and the center-biased characteristics of motion vector (MV) have large impact on the search speed and quality of video. Three fast Block Matching Algorithms (BMAs) of motion estimation through block matching have been implemented and performance of these three has been tested using MATLAB software. The Cross Diamond Search (CDS) is compared with Full Search (FS) and Cross Search (CS) algorithms based on search points (search speed) and peak signal-to-noise ratio (PSNR) as the quality of the video. The CDS algorithm was designed to fit the cross-center-biased (CCB) MV distribution characteristics of the real-world video sequences. CDS compares favorably with the other algorithms for low motion sequences in terms of speed, quality and computational complexity. Keywords: Block-matching, motion estimation, digital video compression, cross-centered biased, cross diamond search.

  11. Performance comparison of motion estimation algorithms on digital video images

    NASA Astrophysics Data System (ADS)

    Ali, N. A.; Ja'afar, A. S.; Anathakrishnan, K. S.

    2010-03-01

    This paper presents a comparative study on technique to achieve high compression ratio in video coding. The focus is on the Block Matching Motion Estimation (BMME) techniques. It has been particularly used in various coding standards. In the BMME, search patterns and the center-biased characteristics of motion vector (MV) have large impact on the search speed and quality of video. Three fast Block Matching Algorithms (BMAs) of motion estimation through block matching have been implemented and performance of these three has been tested using MATLAB software. The Cross Diamond Search (CDS) is compared with Full Search (FS) and Cross Search (CS) algorithms based on search points (search speed) and peak signal-to-noise ratio (PSNR) as the quality of the video. The CDS algorithm was designed to fit the cross-center-biased (CCB) MV distribution characteristics of the real-world video sequences. CDS compares favorably with the other algorithms for low motion sequences in terms of speed, quality and computational complexity. Keywords: Block-matching, motion estimation, digital video compression, cross-centered biased, cross diamond search.

  12. Test patterns and quality metrics for digital video compression

    NASA Astrophysics Data System (ADS)

    Fenimore, Charles P.; Field, Bruce F.; Van Degrift, Craig

    1997-06-01

    Lossy video compression systems such as MPEG2 introduce picture impairments such as image blocking, color distortion and persistent color fragments, 'mosquito noise,' and blurring in their outputs. While there are video test clips which exhibit one or more of these distortions upon coding, there is need of a set of well-characterized test patterns and video quality metrics. Digital test patterns can deliver calibrated stresses to specific features of the encoder, much as the test patterns for analog video stress critical characteristics of that system. Metrics quantify the error effects of compression by a computation. NIST is developing such test patterns and metrics for compression rates that typically introduce perceptually negligible artifacts, i.e. for high quality video. The test patterns are designed for subjective and objective evaluation. The test patterns include a family of computer-generated spinning wheels to stress luminance-based macro-block motion estimation algorithms and images with strongly directional high-frequency content to stress quantization algorithms. In this paper we discuss the spinning wheel test pattern. It has been encoded at a variety of bit rates near the threshold for the perception of impairments. We have observed that impairment perceptibility depends on the local contrast. For the spinning wheel we report the contrast at the threshold for perception of impairments as a function of the bit rate. To quantify perceptual image blocking we have developed a metric which detects 'flats:' image blocks of constant (or near constant) luminance. The effectiveness of this metric is appraised.

  13. Digital Subtraction Fluoroscopic System With Tandem Video Processing Units

    NASA Astrophysics Data System (ADS)

    Gould, Robert G.; Lipton, Martin J.; Mengers, Paul; Dahlberg, Roger

    1981-07-01

    A real-time digital fluoroscopic system utilizing two video processing units (Quantex) in tandem to produce continuous subtraction images of peripheral and internal vessels following intravenous contrast media injection has been inves-tigated. The first processor subtracts a mask image consisting of an exponentially weighted moving average of N1 frames (N1 = 2k where k = 0.7) from each incoming video frame, divides by N1, and outputs the resulting difference image to the second processor. The second unit continuously averages N2 incoming frames (N2 = 2k) and outputs to a video monitor and analog disc recorder. The contrast of the subtracted images can be manipulated by changing gain or by a non-linear output transform. After initial equipment adjustments, a subtraction sequence can be produced without operator interaction with the processors. Alternatively, the operator can freeze the mask and/or the subtracted output image at any time during the sequence. Raw data is preserved on a wide band video tape recorder permitting retrospective viewing of an injection sequence with different processor settings. The advantage of the tandem arrangement is that it has great flexibility in varying the duration and the time of both the mask and injection images thereby minimizing problems of registration between them. In addition, image noise is reduced by compiling video frames rather than by using a large radiation dose for a single frame, which requires a wide dynamic range video camera riot commonly available in diagnostic x-ray equipment. High quality subtraction images of arteries have been obtained in 15 anesthetized dogs using relatively low exposure rates (10-12 μR/video frame) modest volumes of contrast medium (0.5-1 ml/kg), and low injection flow rates (6-10 ml/sec). The results/ achieved so far suggest that this system has direct clinical applications.

  14. Composing across Multiple Media: A Case Study of Digital Video Production in a Fifth Grade Classroom

    ERIC Educational Resources Information Center

    Ranker, Jason

    2008-01-01

    This is a qualitative case study of two students' composing processes as they developed a documentary video about the Dominican Republic in an urban, public middle school classroom. While using a digital video editing program, the students moved across multiple media (the Web, digital video, books, and writing), drawing semiotic resources from…

  15. Digital Video Projects of, by, and for New Teachers: The Multiple Educational Functions of Creating Multimedia

    ERIC Educational Resources Information Center

    Halter, Christopher; Levin, James

    2014-01-01

    A three year study of digital video creation in higher education investigated the impact that creating short digital videos by university students in their final class of a teacher education program had on those students. Each student created a short video reflecting on the process of how he/she became a teacher. An analysis of the videos…

  16. 75 FR 7370 - Closed Captioning of Video Programming; Closed Captioning Requirements for Digital Television...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-02-19

    ... COMMISSION 47 CFR Part 79 Closed Captioning of Video Programming; Closed Captioning Requirements for Digital... Closed Captioning of Video Programming; Closed Captioning Requirements for Digital Television Receivers... 1594, January 13, 2009, is effective February 19, 2010. Video programming distributors must comply with...

  17. Digital Video Projects of, by, and for New Teachers: The Multiple Educational Functions of Creating Multimedia

    ERIC Educational Resources Information Center

    Halter, Christopher; Levin, James

    2014-01-01

    A three year study of digital video creation in higher education investigated the impact that creating short digital videos by university students in their final class of a teacher education program had on those students. Each student created a short video reflecting on the process of how he/she became a teacher. An analysis of the videos…

  18. Composing across Multiple Media: A Case Study of Digital Video Production in a Fifth Grade Classroom

    ERIC Educational Resources Information Center

    Ranker, Jason

    2008-01-01

    This is a qualitative case study of two students' composing processes as they developed a documentary video about the Dominican Republic in an urban, public middle school classroom. While using a digital video editing program, the students moved across multiple media (the Web, digital video, books, and writing), drawing semiotic resources from…

  19. Using digital videos displayed on personal digital assistants (PDAs) to enhance patient education in clinical settings.

    PubMed

    Brock, Tina Penick; Smith, Scott R

    2007-01-01

    To evaluate the effects of using an audiovisual animation (i.e., digital video) displayed on a personal digital assistant (PDA) for patient education in a clinical setting. Quasi-experimental study of a prospective technology intervention conducted in an outpatient infectious diseases clinic at an academic medical center. Subjects responded to questions immediately before, immediately after, and 4-6 weeks after watching a digital video on a PDA. Outcome measures include participant knowledge of disease, knowledge of medications, and knowledge of adherence behaviors; attitudes toward the video and PDA; self-reported adherence; and practicality of the intervention. Fifty-one English-speaking adults who were initiating or taking medications for the treatment of HIV/AIDS participated in the study. At visit one, statistically significant improvements in knowledge of disease (p<0.005; paired t-test), knowledge of medications (p<0.005; paired t-test), and knowledge of adherence behaviors (p<0.05; ANOVA) were measured after participants watched the PDA-based video. At visit two (4-6 weeks later), statistically significant improvements in self-reported adherence to the medication regimens (p<0.005; paired t-test) were reported. Participants liked the PDA-based video and indicated that it was an appropriate medium for learning, regardless of their baseline literacy skills. The video education process was estimated to take 25 min of participant time and was viewed in both private and semi-private locations. Technology-assisted education using a digital video delivered via PDA is a convenient and potentially powerful way to deliver health messages. The intervention was implemented efficiently with participants of a variety of ages and educational levels, and in a range of locations within clinical environments. Additional study of this methodology is warranted.

  20. Integrated Digital Video and Experimental Data Analysis for Microgravity Combustion Experiment

    NASA Technical Reports Server (NTRS)

    1997-01-01

    The purpose of the Diffusive and Radiative Transport in Fires (DARTFire) Project is to study various mechanisms of energy transport in the ignition and growth of flames in microgravity. This sounding rocket experiment incorporates two multispectral video cameras, two 8-mm video recorders, and several temperature and pressure probes that record information on two separate flames, burning under different oxygen concentrations and flow rates. Mirrors allow each camera to view side-by-side images of both flames.

  1. A "Journey in Feminist Theory Together": The "Doing Feminist Theory through Digital Video" Project

    ERIC Educational Resources Information Center

    Hurst, Rachel Alpha Johnston

    2014-01-01

    "Doing Feminist Theory Through Digital Video" is an assignment I designed for my undergraduate feminist theory course, where students created a short digital video on a concept in feminist theory. I outline the assignment and the pedagogical and epistemological frameworks that structured the assignment (digital storytelling,…

  2. Assessing the application of an airborne intensified multispectral video camera to measure chlorophyll a in three Florida estuaries

    SciTech Connect

    Dierberg, F.E.; Zaitzeff, J.

    1997-08-01

    After absolute and spectral calibration, an airborne intensified, multispectral video camera was field tested for water quality assessments over three Florida estuaries (Tampa Bay, Indian River Lagoon, and the St. Lucie River Estuary). Univariate regression analysis of upwelling spectral energy vs. ground-truthed uncorrected chlorophyll a (Chl a) for each estuary yielded lower coefficients of determination (R{sup 2}) with increasing concentrations of Gelbstoff within an estuary. More predictive relationships were established by adding true color as a second independent variable in a bivariate linear regression model. These regressions successfully explained most of the variation in upwelling light energy (R{sup 2}=0.94, 0.82 and 0.74 for the Tampa Bay, Indian River Lagoon, and St. Lucie estuaries, respectively). Ratioed wavelength bands within the 625-710 nm range produced the highest correlations with ground-truthed uncorrected Chl a, and were similar to those reported as being the most predictive for Chl a in Tennessee reservoirs. However, the ratioed wavebands producing the best predictive algorithms for Chl a differed among the three estuaries due to the effects of varying concentrations of Gelbstoff on upwelling spectral signatures, which precluded combining the data into a common data set for analysis.

  3. Digital data over video channels - Techniques for Spacelab

    NASA Technical Reports Server (NTRS)

    Smith, Dean L.; Hanby, Walter D.

    1993-01-01

    A study was made of various techniques for transmitting digital data over a composite video channel. Transmitting data from experiments on the Space Shuttle Orbiter over a video channel is attractive since extra channel capacity is needed. Broadcast television telecommunications schemes and other techniques described in the literature were reviewed and compared. PSK (Phase Shift Keying), MPSK (m-ary PSK), or PAM (Pulse Amplitude Modulation) can be transmitted on visible lines of a frame, unassigned lines of the VBI (Vertical Blanking Interval), or during the HBI (Horizontal Blanking Interval). All three modulation techniques can be attractive under the proper conditions. However, PAM on visible lines or during the VBI should be relatively easy to implement, provide adequate average data rates, and give acceptable BERs (Bit Error Rates).

  4. Gyroscope and visual fusion solution for digital video stabilization

    NASA Astrophysics Data System (ADS)

    Wei, Shanshan; He, Zhiqiang; Xie, Wei

    2016-09-01

    A gyroscope and visual fusion solution for digital video stabilization (DVS) is presented. The solution classifies DVS-related motions into three types: the object motion (OM) in the world space, the camera motion in the camera space (CS), and the pixel motion in the image space (IS). The camera rotation is estimated by gyroscope and smoothed in the CS, while the camera translation is compounded with the OM and smoothed together in the IS. The main contributions of this paper lie in two aspects: (1) propose an inertial and visual fusion method to stabilize both rotational and translational jitters and (2) the fusion method is simple and fast in computation and can be suitable for smart terminals. Experimental results show that the proposed solution performs well in video stabilization.

  5. Digital data over video channels - Techniques for Spacelab

    NASA Technical Reports Server (NTRS)

    Smith, Dean L.; Hanby, Walter D.

    1993-01-01

    A study was made of various techniques for transmitting digital data over a composite video channel. Transmitting data from experiments on the Space Shuttle Orbiter over a video channel is attractive since extra channel capacity is needed. Broadcast television telecommunications schemes and other techniques described in the literature were reviewed and compared. PSK (Phase Shift Keying), MPSK (m-ary PSK), or PAM (Pulse Amplitude Modulation) can be transmitted on visible lines of a frame, unassigned lines of the VBI (Vertical Blanking Interval), or during the HBI (Horizontal Blanking Interval). All three modulation techniques can be attractive under the proper conditions. However, PAM on visible lines or during the VBI should be relatively easy to implement, provide adequate average data rates, and give acceptable BERs (Bit Error Rates).

  6. A remote educational system in medicine using digital video.

    PubMed

    Hahm, Joon Soo; Lee, Hang Lak; Kim, Sun Il; Shimizu, Shuji; Choi, Ho Soon; Ko, Yong; Lee, Kyeong Geun; Kim, Tae Eun; Yun, Ji Won; Park, Yong Jin; Naoki, Nakashima; Koji, Okamura

    2007-03-01

    Telemedicine has opened the door to a wide range of learning experience and simultaneous feedback to doctors and students at various remote locations. However, there are limitations such as lack of approved international standards of ethics. The aim of our study was to establish a telemedical education system through the development of high quality images, using the digital transfer system on a high-speed network. Using telemedicine, surgical images can be sent not only to domestic areas but also abroad, and opinions regarding surgical procedures can be exchanged between the operation room and a remote place. The Asia Pacific Information Infrastrucuture (APII) link, a submarine cable between Busan and Fukuoka, was used to connect Korea with Japan, and Korea Advanced Research Network (KOREN) was used to connect Busan with Seoul. Teleconference and video streaming between Hanyang University Hospital in Seoul and Kyushu University Hospital in Japan were realized using Digital Video Transfer System (DVTS) over Ipv4 network. Four endoscopic surgeries were successfully transmitted between Seoul and Kyushu, while concomitant teleconferences took place between the two throughout the operations. Enough bandwidth of 60 Mbps could be kept for two-line transmissions. The quality of transmitted video image had no frame loss with a rate of 30 images per second. The sound was also clear, and time delay was less than 0.3 sec. Our experience has demonstrated the feasibility of domestic and international telemedicine. We have established an international medical network with high-quality video transmission over Internet protocol, which is easy to perform, reliable, and economical. Our network system may become a promising tool for worldwide telemedical communication in the future.

  7. Video Digitization of Displacement/Gradient Data from Optical Instrumentation Systems.

    DTIC Science & Technology

    1982-12-01

    AD-R124 751 VIDEO DIGITIZATION OF DISPLACEMENT/GRADIENT DATA FROM 1/ OPTICAL INSTRUMENTATION SYSTEMS(U) AR FORCE INST OF TECH NRIONT-PATTERSON AFB ON...uw pat ml mdme* to ISulmdb@ VIDEO DIGITIZATION OF DISPLACEMENT/ GRADIENT DATA FROM OPTICAL INSTRUMENTATION SYSTEMS THESIS AFIT/GAE/AA/82D-5 David R...Chaffee Captain USAF DTJC Approved for public release; distribution unlimited. VIDEO DIGITIZATION OF DISPLACEMENT/GRADIENT DATA FROM OPTICAL

  8. Digital video data archive for crash test systems

    NASA Astrophysics Data System (ADS)

    Hock, Christian

    1997-04-01

    Kayser-Threde has been invested many years in developing technology used in crash testing, data acquisition and test data archiving. Since 1976 the department Measurement Systems has ben supplying European car manufacturers and test houses with ruggedized on-board data acquisition units for use in safety tests according to SAE J 211. The integration of on-board high-speed digital cameras has completed the data acquisition unit. Stationary high-speed cameras for external observation are also included in the controlling and acquisition system of the crash test site. The occupation of Kayser-Threde's department High Speed Data Systems is the design and integration of computerized data flow systems under real-time conditions. The special circumstances of crash test applications are taken into account for data acquisition, mass storage and data distribution. The two fundamental components of the video data archiving systems are, firstly, the recording of digital high-speed images as well as digital test data and secondly, an organized filing in mass archiving systems with the capability of near on-line access. In combination with sophisticated and reliable hardware components Kayser-Threde is able to deliver high performance digital data archives with storage capacities of up to 2600 TeraBytes.

  9. Review of passive-blind detection in digital video forgery based on sensing and imaging techniques

    NASA Astrophysics Data System (ADS)

    Tao, Junjie; Jia, Lili; You, Ying

    2016-01-01

    Advances in digital video compression and IP communication technologies raised new issues and challenges concerning the integrity and authenticity of surveillance videos. It is so important that the system should ensure that once recorded, the video cannot be altered; ensuring the audit trail is intact for evidential purposes. This paper gives an overview of passive techniques of Digital Video Forensics which are based on intrinsic fingerprints inherent in digital surveillance videos. In this paper, we performed a thorough research of literatures relevant to video manipulation detection methods which accomplish blind authentications without referring to any auxiliary information. We presents review of various existing methods in literature, and much more work is needed to be done in this field of video forensics based on video data analysis and observation of the surveillance systems.

  10. Elevating student potential: creating digital video to teach neurotransmission.

    PubMed

    Jarvinen, Michael K; Jarvinen, Lamis Z

    2012-01-01

    Students today have unprecedented access to technology, the Internet, and social media. Their nearly ubiquitous use of these platforms is well documented. Given that today's students may be primed to learn using a different medium, incorporating various technological elements into the classroom in a manner compatible with traditional approaches to teaching becomes a challenge. We recently designed and implemented a strategy that capitalized on this knowledge. Students in their first neuroscience course were required to create a 3-5 minute digital video using video-making freeware available on any Mac or PC. They used images, text, animation, as well as downloaded music to describe the fundamental process of neurotransmission as it applies to a topic of their choice. In comparison to students taught using other more traditional approaches to demonstrate the process of neurotransmission, we observed that students who took part in the video-making project exhibited better understanding of the neurological process at multiple levels, as defined by Bloom's revised taxonomy. This was true even of students who had no aspirations of pursuing a Neuroscience career, thus suggesting that there was an overall increased level of student engagement regardless of personal career interests. The utility of our approach was validated by both direct and indirect assessments. Importantly, this particular strategy to teaching difficult concepts offers a high degree of flexibility allowing it to potentially be incorporated into any upper-level Neuroscience course.

  11. Elevating Student Potential: Creating Digital Video to Teach Neurotransmission

    PubMed Central

    Jarvinen, Michael K.; Jarvinen, Lamis Z.

    2012-01-01

    Students today have unprecedented access to technology, the Internet, and social media. Their nearly ubiquitous use of these platforms is well documented. Given that today’s students may be primed to learn using a different medium, incorporating various technological elements into the classroom in a manner compatible with traditional approaches to teaching becomes a challenge. We recently designed and implemented a strategy that capitalized on this knowledge. Students in their first neuroscience course were required to create a 3–5 minute digital video using video-making freeware available on any Mac or PC. They used images, text, animation, as well as downloaded music to describe the fundamental process of neurotransmission as it applies to a topic of their choice. In comparison to students taught using other more traditional approaches to demonstrate the process of neurotransmission, we observed that students who took part in the video-making project exhibited better understanding of the neurological process at multiple levels, as defined by Bloom’s revised taxonomy. This was true even of students who had no aspirations of pursuing a Neuroscience career, thus suggesting that there was an overall increased level of student engagement regardless of personal career interests. The utility of our approach was validated by both direct and indirect assessments. Importantly, this particular strategy to teaching difficult concepts offers a high degree of flexibility allowing it to potentially be incorporated into any upper-level Neuroscience course. PMID:23493934

  12. WCAM: secured video surveillance with digital rights management

    NASA Astrophysics Data System (ADS)

    Sadourny, Yulen; Conan, Vania; Serrao, Carlos; Fonseca, Pedro

    2005-03-01

    The WCAM project aims to provide an integrated system for secure delivery of video surveillance data over a wireless network, while remaining scalable and robust to transmission errors. To achieve these goals, the content is encoded in Motion-JPEG2000 and streamed with a specific RTP protocol encapsulation to prevent the loss of packets containing the most essential data. Protection of the video data is performed at content level using the standardized JPSEC syntax, along with flexible encryption of quality layers or resolution levels. This selective encryption respects the JPEG2000 structure of the stream, not only ensuring end-to-end ciphered delivery, but also enabling dynamic content adaptation within the wireless network (quality of service, adaptation to the user's terminal). A DRM (Digital Rights Management) solution, called OpenSDRM is added to manage all authenticated peers on the WLAN (from end-users to cameras), as well as to manage the rights to access and display conditionally the video data. This whole integrated architecture addresses several security problems such as data encryption, integrity, access control and rights management. Using several protection layers, the level of confidentiality can depend both on content characteristics and user rights, thus also addressing the critical issue of privacy.

  13. Pigmented Skin Lesion Biopsies After Computer-Aided Multispectral Digital Skin Lesion Analysis.

    PubMed

    Winkelmann, Richard R; Tucker, Natalie; White, Richard; Rigel, Darrell S

    2015-11-01

    The incidence of melanoma has been rising over the past century. With 37% of patients presenting to their primary care physician with at least 1 skin problem, primary care physicians and other nondermatologist practitioners have substantial opportunity to make an impact at the forefront of the disease process. New diagnostic aids have been developed to augment physician analysis of suspicious pigmented skin lesions (PSLs). To determine the effects of computer-aided multispectral digital skin lesion analysis (MSDSLA) on dermatologists' and nondermatologist clinicians' decisions to biopsy suspicious PSLs after clinical and dermatoscopic evaluation. Participants were shown 6 images of PSLs. For each PSL, participants were asked 3 times if they would biopsy the lesion: first after reviewing a clinical image of the PSL, again after reviewing a high-resolution dermatoscopic image, and again after reviewing MSDSLA probability findings. An answer was right if a melanoma or high-risk lesion was selected for biopsy or a low-risk lesion was not selected for biopsy. An answer was wrong if a melanoma or high-risk lesion was not selected for biopsy or a low-risk lesion was selected for biopsy. Clinicians' decisions to biopsy were evaluated using χ² analysis for proportions. Data were analyzed from a total of 212 participants, 177 of whom were dermatologists. Overall, sensitivity of clinical image review was 63%; dermatoscopic image review, 5%; and MSDSLA, 83%. Specificity of clinical image review was 59%; dermatoscopic image review, 40%; and MSDSLA, 76%. Biopsy decision accuracy was 61% after review of clinical images, 52% after review of dermatoscopic images, and 80% after review of MSDSLA findings. The number of lesions participants indicated that they would biopsy increased significantly, from 52% after reviewing clinical images to 63% after reviewing dermatoscopic images (P<.001). However, the overall number of specimens that participants indicated they would biopsy did

  14. Online multispectral fluorescence lifetime values estimation and overlay onto tissue white-light video frames

    NASA Astrophysics Data System (ADS)

    Gorpas, Dimitris; Ma, Dinglong; Bec, Julien; Yankelevich, Diego R.; Marcu, Laura

    2016-03-01

    Fluorescence lifetime imaging has been shown to be a robust technique for biochemical and functional characterization of tissues and to present great potential for intraoperative tissue diagnosis and guidance of surgical procedures. We report a technique for real-time mapping of fluorescence parameters (i.e. lifetime values) onto the location from where the fluorescence measurements were taken. This is achieved by merging a 450 nm aiming beam generated by a diode laser with the excitation light in a single delivery/collection fiber and by continuously imaging the region of interest with a color CMOS camera. The interrogated locations are then extracted from the acquired frames via color-based segmentation of the aiming beam. Assuming a Gaussian profile of the imaged aiming beam, the segmentation results are fitted to ellipses that are dynamically scaled at the full width of three automatically estimated thresholds (50%, 75%, 90%) of the Gaussian distribution's maximum value. This enables the dynamic augmentation of the white-light video frames with the corresponding fluorescence decay parameters. A fluorescence phantom and fresh tissue samples were used to evaluate this method with motorized and hand-held scanning measurements. At 640x512 pixels resolution the area of interest augmented with fluorescence decay parameters can be imaged at an average 34 frames per second. The developed method has the potential to become a valuable tool for real-time display of optical spectroscopy data during continuous scanning applications that subsequently can be used for tissue characterization and diagnosis.

  15. Examining the Effectiveness of Digital Video Recordings on Oral Performance of EFL Learners

    ERIC Educational Resources Information Center

    Göktürk, Nazlinur

    2016-01-01

    This study reports the results of an action-based study conducted in an EFL class to examine whether digital video recordings would contribute to the enhancement of EFL learners' oral fluency skills. It also investigates the learners' perceptions of the use of digital video recordings in a speaking class. 10 Turkish EFL learners participated in…

  16. Too Close for Comfort: Real-Time Science Teaching Reflections via Digital Video Editing

    ERIC Educational Resources Information Center

    Yerrick, Randy; Ross, Donna; Molebash, Philip

    2005-01-01

    This study examined the use of digital video editing as the main venue for fostering reflection. The impact of digital video editing technology on preservice teachers' beliefs included shifts in (a) reflections regarding children's thinking, (b) planning and instruction informed by reflection, and (c) notions of teaching expertise and requisite…

  17. Writing/Thinking in Real Time: Digital Video and Corpus Query Analysis

    ERIC Educational Resources Information Center

    Park, Kwanghyun; Kinginger, Celeste

    2010-01-01

    The advance of digital video technology in the past two decades facilitates empirical investigation of learning in real time. The focus of this paper is the combined use of real-time digital video and a networked linguistic corpus for exploring the ways in which these technologies enhance our capability to investigate the cognitive process of…

  18. The Effect of Digital Video Games on EFL Students' Language Learning Motivation

    ERIC Educational Resources Information Center

    Ebrahimzadeh, Mohsen; Alavi, Sepideh

    2017-01-01

    The study examined the effect of a commercial digital video game on high school students' language learning motivation. Participants were 241 male students randomly assigned to one of the following three treatments: Readers, who intensively read the game's story; Players, who played the digital video game; and Watchers, who watched two classmates…

  19. Digital data, composite video multiplexer and demultiplexer boards for an IBM PC/AT compatible computer

    NASA Technical Reports Server (NTRS)

    Smith, Dean Lance

    1993-01-01

    Work continued on the design of two IBM PC/AT compatible computer interface boards. The boards will permit digital data to be transmitted over a composite video channel from the Orbiter. One board combines data with a composite video signal. The other board strips the data from the video signal.

  20. Team Up with Digital Video and iMovie for Social Studies Excitement.

    ERIC Educational Resources Information Center

    Howard, Melanie

    2001-01-01

    Describes the use of video technology in elementary schools, particularly for social studies activities. Explains iMovie, a nonlinear editing software program for digital video nonprofessionals; discusses the possibilities for cooperative projects between library media specialists and teachers; and offers video production tips. (LRW)

  1. From Thumbs to Fingertips: Introducing Networked Digital Video to Online Learning

    ERIC Educational Resources Information Center

    Karlsen, Gary

    2005-01-01

    Recent developments in digital rights enablement for video, plus inexpensive purpose-built applications such as the Media on Demand system, are now adding video to the montage of rich media objects for learning online. Video libraries and repositories can be customized and stored on local servers for access by place-based or distance learners as…

  2. On the Complexity of Digital Video Cameras in/as Research: Perspectives and Agencements

    ERIC Educational Resources Information Center

    Bangou, Francis

    2014-01-01

    The goal of this article is to consider the potential for digital video cameras to produce as part of a research agencement. Our reflection will be guided by the current literature on the use of video recordings in research, as well as by the rhizoanalysis of two vignettes. The first of these vignettes is associated with a short video clip shot by…

  3. On the Complexity of Digital Video Cameras in/as Research: Perspectives and Agencements

    ERIC Educational Resources Information Center

    Bangou, Francis

    2014-01-01

    The goal of this article is to consider the potential for digital video cameras to produce as part of a research agencement. Our reflection will be guided by the current literature on the use of video recordings in research, as well as by the rhizoanalysis of two vignettes. The first of these vignettes is associated with a short video clip shot by…

  4. Applying emerging digital video interface standards to airborne avionics sensor and digital map integrations: benefits outweigh the initial costs

    NASA Astrophysics Data System (ADS)

    Kuehl, C. Stephen

    1996-06-01

    Video signal system performance can be compromised in a military aircraft cockpit management system (CMS) with the tailoring of vintage Electronics Industries Association (EIA) RS170 and RS343A video interface standards. Video analog interfaces degrade when induced system noise is present. Further signal degradation has been traditionally associated with signal data conversions between avionics sensor outputs and the cockpit display system. If the CMS engineering process is not carefully applied during the avionics video and computing architecture development, extensive and costly redesign will occur when visual sensor technology upgrades are incorporated. Close monitoring and technical involvement in video standards groups provides the knowledge-base necessary for avionic systems engineering organizations to architect adaptable and extendible cockpit management systems. With the Federal Communications Commission (FCC) in the process of adopting the Digital HDTV Grand Alliance System standard proposed by the Advanced Television Systems Committee (ATSC), the entertainment and telecommunications industries are adopting and supporting the emergence of new serial/parallel digital video interfaces and data compression standards that will drastically alter present NTSC-M video processing architectures. The re-engineering of the U.S. Broadcasting system must initially preserve the electronic equipment wiring networks within broadcast facilities to make the transition to HDTV affordable. International committee activities in technical forums like ITU-R (former CCIR), ANSI/SMPTE, IEEE, and ISO/IEC are establishing global consensus on video signal parameterizations that support a smooth transition from existing analog based broadcasting facilities to fully digital computerized systems. An opportunity exists for implementing these new video interface standards over existing video coax/triax cabling in military aircraft cockpit management systems. Reductions in signal

  5. Digital video, learning styles, and student understanding of kinematics graphs

    NASA Astrophysics Data System (ADS)

    Hein, Teresa Lee

    1997-12-01

    Student ability to analyze and interpret motion graphs following laboratory instruction that utilized interactive digital video as well as traditional instructional techniques was investigated. Research presented suggested that digital video tools serve to motivate students and may be an effective mechanism to enhance student understanding of motion concepts. Two laboratory exercises involving motion concepts were developed for this study. Students were divided into two instructional groups. The treatment group used digital video techniques and the control group used traditional techniques to perform the laboratory exercises. Student understanding of motion concepts were assessed, in part, using the Test of Understanding Graphs-Kinematics. Other assessment measures included student responses to a set of written graphical analysis questions and two post-lab activities. Possible relationships between individual learning style preferences and student understanding of motion concepts were also addressed. Learning style preferences were assessed using the Productivity Environmental Preference Survey prior to the instructional treatments. Students were asked to comment in writing about their learning styles before and after they were given the learning style assessment. Student comments revealed that the results they received from Productivity Environmental Preference Survey accurately reflected their learning styles. Results presented in this study showed that no significant relationship exists between students' learning style preferences and their ability to interpret motion graphs as measured by scores on the Test of Understanding Graphs-Kinematics. In addition, the results showed no significant difference between instructional treatment and mean scores on the Test of Understanding Graphs-Kinematics. Analysis of writing activities revealed that students in the treatment group responded more effectively than students in the control group to graphical interpretation

  6. 47 CFR 25.212 - Narrowband analog transmissions, digital transmissions, and video transmissions in the GSO Fixed...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... transmissions, and video transmissions in the GSO Fixed-Satellite Service. 25.212 Section 25.212... Technical Standards § 25.212 Narrowband analog transmissions, digital transmissions, and video transmissions... narrowband and/or wideband digital services, including digital video services, if the maximum input spectral...

  7. 47 CFR 25.212 - Narrowband analog transmissions, digital transmissions, and video transmissions in the GSO Fixed...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... transmissions, and video transmissions in the GSO Fixed-Satellite Service. 25.212 Section 25.212... Technical Standards § 25.212 Narrowband analog transmissions, digital transmissions, and video transmissions... narrowband and/or wideband digital services, including digital video services, if the maximum input spectral...

  8. Viewing Michigan's Digital Future: Results of a Survey of Educators' Use of Digital Video in the USA

    ERIC Educational Resources Information Center

    Mardis, Marcia A.

    2009-01-01

    Digital video is a growing and important presence in student learning. This paper reports the results of a survey of American educators in Michigan (n = 426) conducted in spring 2008. The survey included questions about educators' attitudes toward the streaming and downloadable video services available to them in their schools. The survey results…

  9. Using ARINC 818 Avionics Digital Video Bus (ADVB) for military displays

    NASA Astrophysics Data System (ADS)

    Alexander, Jon; Keller, Tim

    2007-04-01

    ARINC 818 Avionics Digital Video Bus (ADVB) is a new digital video interface and protocol standard developed especially for high bandwidth uncompressed digital video. The first draft of this standard, released in January of 2007, has been advanced by ARINC and the aerospace community to meet the acute needs of commercial aviation for higher performance digital video. This paper analyzes ARINC 818 for use in military display systems found in avionics, helicopters, and ground vehicles. The flexibility of ARINC 818 for the diverse resolutions, grayscales, pixel formats, and frame rates of military displays is analyzed as well as the suitability of ARINC 818 to support requirements for military video systems including bandwidth, latency, and reliability. Implementation issues relevant to military displays are presented.

  10. Estimating the chlorophyll content in the waters of Guanabara Bay from the LANDSAT multispectral scanning digital data

    NASA Technical Reports Server (NTRS)

    Dejesusparada, N. (Principal Investigator); Bentancurt, J. J. V.; Herz, B. R.; Molion, L. B.

    1980-01-01

    Detection of water quality in Guanabara Bay using multispectral scanning digital data taken from LANDSAT satellites was examined. To test these processes, an empirical (statistical) approach was choosen to observe the degree of relationship between LANDSAT data and the in situ data taken simultaneously. The linear and nonlinear regression analyses were taken from among those developed by INPE in 1978. Results indicate that the major regression was in the number six MSS band, atmospheric effects, which indicated a correction coefficient of 0.99 and an average error of 6.59 micrograms liter. This error was similar to that obtained in the laboratory. The chlorophyll content was between 0 and 100 micrograms/liter, as taken from the MSS of LANDSAT.

  11. Computer and Video Games in Family Life: The Digital Divide as a Resource in Intergenerational Interactions

    ERIC Educational Resources Information Center

    Aarsand, Pal Andre

    2007-01-01

    In this ethnographic study of family life, intergenerational video and computer game activities were videotaped and analysed. Both children and adults invoked the notion of a digital divide, i.e. a generation gap between those who master and do not master digital technology. It is argued that the digital divide was exploited by the children to…

  12. Too Close for Comfort: Real-Time Science Teaching Reflections via Digital Video Editing

    NASA Astrophysics Data System (ADS)

    Yerrick, Randy; Ross, Donna; Molebash, Philip

    2005-12-01

    This study examined the use of digital video editing as the main venue for fostering reflection. The impact of digital video editing technology on preservice teachers' beliefs included shifts in (a) reflections regarding children's thinking, (b) planning and instruction informed by reflection, and (c) notions of teaching expertise and requisite knowledge. Results were based on an instructional approach emphasizing the exploration of preservice teachers' own planning and teaching as they edited their own video accounts. These findings contrast typical video usage in teacher preparation in which teachers reflect upon the practice of others. Implications for teacher education programs and future research are discussed.

  13. Portable digital video instruction in predoctoral education of child behavior management.

    PubMed

    Boynton, James R; Johnson, Lynn A; Nainar, S M Hashim; Hu, Jan C C

    2007-04-01

    The goals of this exploratory study were to determine students' assessment of portable digital video instruction (using the Apple iPod) and to compare examination performance among groups of predoctoral dental students who did and did not utilize portable digital video instruction as a supplement to a conventional pediatric behavior management lecture. Dental students received a one-hour lecture on communication with the parent and child patient as part of their regular sophomore pediatric dentistry curriculum. Digital audio and digital video versions of this lecture were made available to all 113 students in the class. Eleven student volunteers were loaned portable digital video players (the iPod) containing the lecture for a two-week period. Upon completion of the study period, the entire class participated in an anonymous fifteen-minute post-intervention written assessment including a thirteen-item examination covering lecture material. Students who had used the iPod to review the digital video lecture material favored this medium as a pedagogical instrument and as a group performed significantly better on the examination than those who had not reviewed the digital material (p=0.034). In conclusion, portable digital instructional videos may be a useful educational methodology to help predoctoral dental students acquire knowledge in pediatric behavior management.

  14. Delicate visual artifacts of advanced digital video processing algorithms

    NASA Astrophysics Data System (ADS)

    Nicolas, Marina M.; Lebowsky, Fritz

    2005-03-01

    With the incoming of digital TV, sophisticated video processing algorithms have been developed to improve the rendering of motion or colors. However, the perceived subjective quality of these new systems sometimes happens to be in conflict with the objective measurable improvement we expect to get. In this presentation, we show examples where algorithms should visually improve the skin tone rendering of decoded pictures under normal conditions, but surprisingly fail, when the quality of mpeg encoding drops below a just noticeable threshold. In particular, we demonstrate that simple objective criteria used for the optimization, such as SAD, PSNR or histogram sometimes fail, partly because they are defined on a global scale, ignoring local characteristics of the picture content. We then integrate a simple human visual model to measure potential artifacts with regard to spatial and temporal variations of the objects' characteristics. Tuning some of the model's parameters allows correlating the perceived objective quality with compression metrics of various encoders. We show the evolution of our reference parameters in respect to the compression ratios. Finally, using the output of the model, we can control the parameters of the skin tone algorithm to reach an improvement in overall system quality.

  15. Spotlight on Authentic Learning: Student Developed Digital Video Projects

    ERIC Educational Resources Information Center

    Kearney, Matthew; Schuck, Sandy

    2006-01-01

    The recent convergence of video and computer technologies presents new opportunities and challenges in education. Video production resources such as cameras and video editing software are now widely available in many schools and homes. The ease of use of these resources has encouraged teachers to use them across the curriculum with students of all…

  16. Spotlight on Authentic Learning: Student Developed Digital Video Projects

    ERIC Educational Resources Information Center

    Kearney, Matthew; Schuck, Sandy

    2006-01-01

    The recent convergence of video and computer technologies presents new opportunities and challenges in education. Video production resources such as cameras and video editing software are now widely available in many schools and homes. The ease of use of these resources has encouraged teachers to use them across the curriculum with students of all…

  17. The SPECIAL System: Searching Time-Compressed Digital Video Lectures.

    ERIC Educational Resources Information Center

    Harrigan, Kevin

    2000-01-01

    The SPECIAL system is a computer application that allows learners to control the speed of video playback. Learners viewed an educational video and used a modified version of the SPECIAL system to search for particular items during playback. Results showed neither question type nor video type had a significant effect. Concludes that multimedia…

  18. LANDSAT-4 multispectral scanner (MSS) subsystem radiometric characterization

    NASA Technical Reports Server (NTRS)

    Alford, W. (Editor); Barker, J. (Editor); Clark, B. P.; Dasgupta, R.

    1983-01-01

    The multispectral band scanner (mass) and its spectral characteristics are described and methods are given for relating video digital levels on computer compatible tapes to radiance into the sensor. Topics covered include prelaunch calibration procedures and postlaunch radiometric processng. Examples of current data resident on the MSS image processing system are included. The MSS on LANDSAT 4 is compared with the scanners on earlier LANDSAT satellites.

  19. Predicting grain yield in rice using multi-temporal vegetation indices from UAV-based multispectral and digital imagery

    NASA Astrophysics Data System (ADS)

    Zhou, X.; Zheng, H. B.; Xu, X. Q.; He, J. Y.; Ge, X. K.; Yao, X.; Cheng, T.; Zhu, Y.; Cao, W. X.; Tian, Y. C.

    2017-08-01

    Timely and non-destructive assessment of crop yield is an essential part of agricultural remote sensing (RS). The development of unmanned aerial vehicles (UAVs) has provided a novel approach for RS, and makes it possible to acquire high spatio-temporal resolution imagery on a regional scale. In this study, the rice grain yield was predicted with single stage vegetation indices (VIs) and multi-temporal VIs derived from the multispectral (MS) and digital images. The results showed that the booting stage was identified as the optimal stage for grain yield prediction with VIs at a single stage for both digital image and MS image. And corresponding optimal color index was VARI with R2 value of 0.71 (Log relationship). While the optimal vegetation index NDVI[800,720] based on MS images showed a linear relationship with the grain yield and gained a higher R2 value (0.75) than color index did. The multi-temporal VIs showed a higher correlation with grain yield than the single stage VIs did. And the VIs at two random growth stage with the multiple linear regression function [MLR(VI)] performed best. The highest correlation coefficient were 0.76 with MLR(NDVI[800,720]) at the booting and heading stages (for the MS image) and 0.73 with MLR(VARI) at the jointing and booting stages (for the digital image). In addition, the VIs that showed a high correlation with LAI performed well for yield prediction, and the VIs composed of red edge band (720 nm) and near infrared band (800 nm) were found to be more effective in predicting yield and LAI at high level. In conclusion, this study has demonstrated that both MS and digital sensors mounted on the UAV are reliable platforms for rice growth and grain yield estimation, and determined the best period and optimal VIs for rice grain yield prediction.

  20. An analysis of technology usage for streaming digital video in support of a preclinical curriculum.

    PubMed Central

    Dev, P.; Rindfleisch, T. C.; Kush, S. J.; Stringer, J. R.

    2000-01-01

    Usage of streaming digital video of lectures in preclinical courses was measured by analysis of the data in the log file maintained on the web server. We observed that students use the video when it is available. They do not use it to replace classroom attendance but rather for review before examinations or when a class has been missed. Usage of video has not increased significantly for any course within the 18 month duration of this project. PMID:11079869

  1. An analysis of technology usage for streaming digital video in support of a preclinical curriculum.

    PubMed

    Dev, P; Rindfleisch, T C; Kush, S J; Stringer, J R

    2000-01-01

    Usage of streaming digital video of lectures in preclinical courses was measured by analysis of the data in the log file maintained on the web server. We observed that students use the video when it is available. They do not use it to replace classroom attendance but rather for review before examinations or when a class has been missed. Usage of video has not increased significantly for any course within the 18 month duration of this project.

  2. A new method for digital video documentation in surgical procedures and minimally invasive surgery.

    PubMed

    Wurnig, P N; Hollaus, P H; Wurnig, C H; Wolf, R K; Ohtsuka, T; Pridun, N S

    2003-02-01

    Documentation of surgical procedures is limited to the accuracy of description, which depends on the vocabulary and the descriptive prowess of the surgeon. Even analog video recording could not solve the problem of documentation satisfactorily due to the abundance of recorded material. By capturing the video digitally, most problems are solved in the circumstances described in this article. We developed a cheap and useful digital video capturing system that consists of conventional computer components. Video images and clips can be captured intraoperatively and are immediately available. The system is a commercial personal computer specially configured for digital video capturing and is connected by wire to the video tower. Filming was done with a conventional endoscopic video camera. A total of 65 open and endoscopic procedures were documented in an orthopedic and a thoracic surgery unit. The median number of clips per surgical procedure was 6 (range, 1-17), and the median storage volume was 49 MB (range, 3-360 MB) in compressed form. The median duration of a video clip was 4 min 25 s (range, 45 s to 21 min). Median time for editing a video clip was 12 min for an advanced user (including cutting, title for the movie, and compression). The quality of the clips renders them suitable for presentations. This digital video documentation system allows easy capturing of intraoperative video sequences in high quality. All possibilities of documentation can be performed. With the use of an endoscopic video camera, no compromises with respect to sterility and surgical elbowroom are necessary. The cost is much lower than commercially available systems, and setting changes can be performed easily without trained specialists.

  3. Using Online Digital Tools and Video to Support International Problem-Based Learning

    ERIC Educational Resources Information Center

    Lajoie, Susanne P.; Hmelo-Silver, Cindy; Wiseman, Jeffrey; Chan, Lap Ki; Lu, Jingyan; Khurana, Chesta; Cruz-Panesso, Ilian; Poitras, Eric; Kazemitabar, Maedeh

    2014-01-01

    The goal of this study is to examine how to facilitate cross-cultural groups in problem-based learning (PBL) using online digital tools and videos. The PBL consisted of two video-based cases used to trigger student-learning issues about giving bad news to HIV-positive patients. Mixed groups of medical students from Canada and Hong Kong worked with…

  4. The Use of Web-Based Video for Instruction of GIS and Other Digital Geographic Methods

    ERIC Educational Resources Information Center

    Rudow, Joshua; Sounny-Slitine, M. Anwar

    2015-01-01

    This article presents a case study that highlights the benefits and limitations of Web-based video in lab sections of The Geographer's Craft, an upper-level undergraduate course in which students apply digital geographic methods. Over three years (2010-2013), the authors experimented with different teaching strategies utilizing Web-based video for…

  5. Use of Digital Video to Assess Orientation and Mobility Observational Skills

    ERIC Educational Resources Information Center

    Zebehazy, Kim T.; Zimmerman, George J.; Fox, Lynn A.

    2005-01-01

    This study compared the observational skills in orientation and mobility (O&M) of nine university students and nine certified O&M specialists using a digital video assessment. The students differed from the O&M specialists in their stylistic observations and the details of their responses. Implications for the improvement of video assessments are…

  6. The Use of Web-Based Video for Instruction of GIS and Other Digital Geographic Methods

    ERIC Educational Resources Information Center

    Rudow, Joshua; Sounny-Slitine, M. Anwar

    2015-01-01

    This article presents a case study that highlights the benefits and limitations of Web-based video in lab sections of The Geographer's Craft, an upper-level undergraduate course in which students apply digital geographic methods. Over three years (2010-2013), the authors experimented with different teaching strategies utilizing Web-based video for…

  7. Using Digital Video as a Research Tool: Ethical Issues for Researchers

    ERIC Educational Resources Information Center

    Schuck, Sandy; Kearney, Matthew

    2006-01-01

    Digital video and accompanying editing software are increasingly becoming more accessible for researchers in terms of ease of use and cost. The rich, visually appealing and seductive nature of video-based data can convey a strong sense of direct experience with the phenomena studied (Pea, 1999). However, the ease of selection and editing of…

  8. Using Video in Urban Elementary Professional Development to Support Digital Media Arts Integration

    ERIC Educational Resources Information Center

    Woodard, Rebecca; Machado, Emily

    2017-01-01

    Using ethnographic methods, this article looks closely at how a team of first-grade teachers and digital media artists in an urban elementary school used video in innovative ways during professional development over the course of one year. Extending a body of literature that primarily documents how video can be used as a tool in professional…

  9. Using Digital Video as a Research Tool: Ethical Issues for Researchers

    ERIC Educational Resources Information Center

    Schuck, Sandy; Kearney, Matthew

    2006-01-01

    Digital video and accompanying editing software are increasingly becoming more accessible for researchers in terms of ease of use and cost. The rich, visually appealing and seductive nature of video-based data can convey a strong sense of direct experience with the phenomena studied (Pea, 1999). However, the ease of selection and editing of…

  10. [Detecting fire smoke based on the multispectral image].

    PubMed

    Wei, Ying-Zhuo; Zhang, Shao-Wu; Liu, Yan-Wei

    2010-04-01

    Smoke detection is very important for preventing forest-fire in the fire early process. Because the traditional technologies based on video and image processing are easily affected by the background dynamic information, three limitations exist in these technologies, i. e. lower anti-interference ability, higher false detection rate and the fire smoke and water fog being not easily distinguished. A novel detection method for detecting smoke based on the multispectral image was proposed in the present paper. Using the multispectral digital imaging technique, the multispectral image series of fire smoke and water fog were obtained in the band scope of 400 to 720 nm, and the images were divided into bins. The Euclidian distance among the bins was taken as a measurement for showing the difference of spectrogram. After obtaining the spectral feature vectors of dynamic region, the regions of fire smoke and water fog were extracted according to the spectrogram feature difference between target and background. The indoor and outdoor experiments show that the smoke detection method based on multispectral image can be applied to the smoke detection, which can effectively distinguish the fire smoke and water fog. Combined with video image processing method, the multispectral image detection method can also be applied to the forest fire surveillance, reducing the false alarm rate in forest fire detection.

  11. Making Sure What You See Is What You Get: Digital Video Technology and the Preparation of Teachers of Elementary Science

    ERIC Educational Resources Information Center

    Bueno de Mesquita, Paul; Dean, Ross F.; Young, Betty J.

    2010-01-01

    Advances in digital video technology create opportunities for more detailed qualitative analyses of actual teaching practice in science and other subject areas. User-friendly digital cameras and highly developed, flexible video-analysis software programs have made the tasks of video capture, editing, transcription, and subsequent data analysis…

  12. Tactile Digital Video Globes: a New Way to Outreach Oceanography.

    NASA Astrophysics Data System (ADS)

    Poteau, A.; Claustre, H.; Scheurle, C.; Jessin, T.; Fontana, C.

    2016-02-01

    One objective of the "Ocean Autonomous Observation" team of the Laboratory of Oceanography of Villefranche-sur-mer is to develop new means to outreach our science activities to various audiences. Besides the scientific community, this includes students and targets the general public, school pupils, and stakeholders. In this context, we have acquired a digital video globe with tactile capabilities and we will present here the various applications that we have been developing. A first type of products concerns the visualization of oceanic properties (SST, salinity, density, Chla, O2, NO3, irradiance) by diving from the surface (generally from satellite data) into the Ocean interior (through the use of global data bases, Argo, WOA). In second place, specific applications deal with surface animations allowing highlighting the seasonality of some properties (Chla, SST, ice cover, currents; based on satellite as well as modeling outputs). Finally, we show a variety of applications developed using the tactile functionality of the spherical display. In particular real-time vertical profiles acquired by Bio-Argo floats become directly accessible for the entire open ocean. Such a new tool plus its novel applications has been presented to school children, and to the wider public (at the so-called "fête de la science") as well as to potential sponsors of our science-outreach activities. Their feedback has always been highly positive and encouraging in terms of impact. From the scientists point of view, the use of this new support can easily compete with the classical PowerPoint, is much more attractive and fun and undeniably helps to outreach the various aspects of our pluridisciplinary science.

  13. Establishing a gold standard for manual cough counting: video versus digital audio recordings.

    PubMed

    Smith, Jaclyn A; Earis, John E; Woodcock, Ashley A

    2006-08-03

    Manual cough counting is time-consuming and laborious; however it is the standard to which automated cough monitoring devices must be compared. We have compared manual cough counting from video recordings with manual cough counting from digital audio recordings. We studied 8 patients with chronic cough, overnight in laboratory conditions (diagnoses were 5 asthma, 1 rhinitis, 1 gastro-oesophageal reflux disease and 1 idiopathic cough). Coughs were recorded simultaneously using a video camera with infrared lighting and digital sound recording. The numbers of coughs in each 8 hour recording were counted manually, by a trained observer, in real time from the video recordings and using audio-editing software from the digital sound recordings. The median cough frequency was 17.8 (IQR 5.9-28.7) cough sounds per hour in the video recordings and 17.7 (6.0-29.4) coughs per hour in the digital sound recordings. There was excellent agreement between the video and digital audio cough rates; mean difference of -0.3 coughs per hour (SD +/- 0.6), 95% limits of agreement -1.5 to +0.9 coughs per hour. Video recordings had poorer sound quality even in controlled conditions and can only be analysed in real time (8 hours per recording). Digital sound recordings required 2-4 hours of analysis per recording. Manual counting of cough sounds from digital audio recordings has excellent agreement with simultaneous video recordings in laboratory conditions. We suggest that ambulatory digital audio recording is therefore ideal for validating future cough monitoring devices, as this as this can be performed in the patients own environment.

  14. Learner-Generated Digital Video: Using Ideas Videos in Teacher Education

    ERIC Educational Resources Information Center

    Kearney, Matthew

    2013-01-01

    This qualitative study investigates the efficacy of "Ideas Videos" (or "iVideos") in pre-service teacher education. It explores the experiences of student teachers and their lecturer engaging with this succinct, advocacy-style video genre designed to evoke emotions about powerful ideas in Education (Wong, Mishra, Koehler, &…

  15. Digital video technology and production 101: lights, camera, action.

    PubMed

    Elliot, Diane L; Goldberg, Linn; Goldberg, Michael J

    2014-01-01

    Videos are powerful tools for enhancing the reach and effectiveness of health promotion programs. They can be used for program promotion and recruitment, for training program implementation staff/volunteers, and as elements of an intervention. Although certain brief videos may be produced without technical assistance, others often require collaboration and contracting with professional videographers. To get practitioners started and to facilitate interactions with professional videographers, this Tool includes a guide to the jargon of video production and suggestions for how to integrate videos into health education and promotion work. For each type of video, production principles and issues to consider when working with a professional videographer are provided. The Tool also includes links to examples in each category of video applications to health promotion.

  16. Digital Video for Fostering Self-Reflection in an ePortfolio Environment

    ERIC Educational Resources Information Center

    Cheng, Gary; Chau, Juliana

    2009-01-01

    The ability to self-reflect is widely recognized as a desirable learner attribute that can induce deep learning. Advances in computer-mediated communication technologies have led to intense interest in higher education in exploring the potential of digital tools, particularly digital video, for fostering self-reflection. While there are reports…

  17. The Impact of Digital Video Technology on Production: The Case of "American Gothic."

    ERIC Educational Resources Information Center

    Fink, Edward J.

    1997-01-01

    Opines that the study of video production is important in better understanding the aural/visual aspects of television, especially since television production is undergoing a digital revolution. Assesses the impact of new technologies by examining a "cutting-edge" program, "American Gothic." Finds that digital technology offers…

  18. Correlation Between the Evaluation of Pigmented Lesions by a Multi-spectral Digital Skin Lesion Analysis Device and the Clinical and Histological Features of Melanoma.

    PubMed

    Winkelmann, Richard R; Rigel, Darrell S; Ferris, Laura; Sober, Arthur; Tucker, Natalie; Cockerell, Clay J

    2016-03-01

    To correlate Multi-spectral Digital Skin Lesion Analysis classifier scores with histopathological severity of pigmented lesions and clinical features of melanoma. Classifier scores were computed for 1,632 skin lesions. Dermatologists evaluated the same lesions for Asymmetry, Border Irregularity, Color variegation, Diameter >6mm, Evolution, Patient's Concern, Regression, and/or "Ugly Duckling" sign. Classifier scores were correlated to the number of clinical risk features and for six histopathological severity levels of pigmented lesions. Average classifier score, Welch's t-test, and chi-square analysis. Melanomas had higher mean classifier scores (3.5) than high-grade dysplastic nevi (2.7, p=0.002), low-grade dysplastic nevi (1.7, p<0.0001), non-dysplastic nevi (1.6, p<0.0001), and benign non-melanocytic lesions (2.0, p<0.0001). Classifier score and the number of clinical risk characteristics directly correlated (Pearson coefficient 0.32, p<0.0001). Correlation of classifier scores to clinical and histological melanoma features supports the effectiveness of Multi-spectral Digital Skin Lesion Analysis in assessing the risk of pigmented lesions requiring biopsy. Optimizing outcomes of dermatologist decisions to biopsy suspicious pigmented lesions may be enhanced utilizing Multi-spectral Digital Skin Lesion Analysis.

  19. On the Development of a Digital Video Motion Detection Test Set

    SciTech Connect

    Pritchard, Daniel A.; Vigil, Jose T.

    1999-06-07

    This paper describes the current effort to develop a standardized data set, or suite of digital video sequences, that can be used for test and evaluation of digital video motion detectors (VMDS) for exterior applications. We have drawn from an extensive video database of typical application scenarios to assemble a comprehensive data set. These data, some existing for many years on analog videotape, have been converted to a reproducible digital format and edited to generate test sequences several minutes long for many scenarios. Sequences include non- alarm video, intrusions and nuisance alarm sources, taken with a variety of imaging sensors including monochrome CCD cameras and infrared (thermal) imaging cameras, under a variety of daytime and nighttime conditions. The paper presents an analysis of the variables and estimates the complexity of a thorough data set. Some of this video data test has been digitized for CD-ROM storage and playback. We are considering developing a DVD disk for possible use in screening and testing VMDs prior to government testing and deployment. In addition, this digital video data may be used by VMD developers for fhrther refinement or customization of their product to meet specific requirements. These application scenarios may also be used to define the testing parameters for futore procurement qualification. A personal computer may be used to play back either the CD-ROM or the DVD video data. A consumer electronics-style DVD player may be used to replay the DVD disk. This paper also discusses various aspects of digital video storage including formats, resolution, CD-ROM and DVD storage capacity, formats, editing and playback.

  20. A multispectral digital Cervigram analyzer in the wavelet domain for early detection of cervical cancer

    NASA Astrophysics Data System (ADS)

    Yang, Shuyu; Guo, Jiangling; King, Philip S.; Sriraja, Y.; Mitra, Sunanda; Nutter, Brian; Ferris, Daron; Schiffman, Mark; Jeronimo, Jose; Long, Rodney

    2004-05-01

    The significance and need for expert interpretation of cervigrams (images of the cervix) in the study of the uterine cervix changes and pre-neoplasic lesions preceding cervical cancer are being investigated. The National Cancer Institute has collected a unique dataset taken from patients with normal cervixes and at various stages of cervical pre-cancer and cancer. This dataset allows us the opportunity for studying the uterine cervix changes for validating the potential of automated classification and recognition algorithms in discriminating cervical neoplasia and normal tissue. Pilot studies have been designed (1) to evaluate the effect of image transformation and optimal color mapping on the accepted levels of compression needed for effective dissemination of cervical image data over a network and (2) for automated detection of lesions from feature extraction, registration, and segmentation of lesions in cervix image sequences. In this paper, we present the results of the effectiveness of a novel, wavelet based, multi-spectral analyzer in retaining diagnostic features in encoded cervical images, thus allowing investigation on the potential of automated detection of lesions in cervix image sequences using automated registration, color transformation and bit-rate control, and a statistical segmentation approach.

  1. Multispectral lensless digital holographic microscope: imaging MCF-7 and MDA-MB-231 cancer cell cultures

    NASA Astrophysics Data System (ADS)

    Ryle, James P.; Molony, Karen M.; McDonnell, Susan; Naughton, Thomas J.; Sheridan, John T.

    2009-08-01

    Digital holography is the process where an object's phase and amplitude information is retrieved from intensity images obtained using a digital camera (e.g. CCD or CMOS sensor). In-line digital holographic techniques offer full use of the recording device's sampling bandwidth, unlike off-axis holography where object information is not modulated onto carrier fringes. Reconstructed images are obscured by the linear superposition of the unwanted, out of focus, twin images. In addition to this, speckle noise degrades overall quality of the reconstructed images. The speckle effect is a phenomenon of laser sources used in digital holographic systems. Minimizing the effects due to speckle noise, removal of the twin image and using the full sampling bandwidth of the capture device aids overall reconstructed image quality. Such improvements applied to digital holography can benefit applications such as holographic microscopy where the reconstructed images are obscured with twin image information. Overcoming such problems allows greater flexibility in current image processing techniques, which can be applied to segmenting biological cells (e.g. MCF-7 and MDA-MB- 231) to determine their overall cell density and viability. This could potentially be used to distinguish between apoptotic and necrotic cells in large scale mammalian cell processes, currently the system of choice, within the biopharmaceutical industry.

  2. Video Preservation and Digital Reformatting: Pain and Possibility

    ERIC Educational Resources Information Center

    McDonough, Jerome; Jimenez, Mona

    2006-01-01

    The digital library community is increasingly concerned with long-term preservation of digital materials. This concern presents an opportunity for strategic alliances between digital library units and preservation departments confronting the difficulties inherent in preservation reformatting of moving image materials. However, successful…

  3. Video Preservation and Digital Reformatting: Pain and Possibility

    ERIC Educational Resources Information Center

    McDonough, Jerome; Jimenez, Mona

    2006-01-01

    The digital library community is increasingly concerned with long-term preservation of digital materials. This concern presents an opportunity for strategic alliances between digital library units and preservation departments confronting the difficulties inherent in preservation reformatting of moving image materials. However, successful…

  4. A selected bibliography: Application of Landsat digital multispectral scanner data to agriculture, forestry, and range management

    USGS Publications Warehouse

    Rohde, Wayne G.

    1977-01-01

    This bibliography contains citations of selected publications and technical reports dealing with the application of Landsat digital data analysis techniques to agriculture, forestry, and range management problems. All of the citations were published between 1973 and 1977. The citations reference publications and reports which discuss specific analysis techniques and specific resource applications.

  5. Multivariate interactive digital analysis system /MIDAS/ - A new fast multispectral recognition system

    NASA Technical Reports Server (NTRS)

    Kriegler, F.; Marshall, R.; Lampert, S.; Gordon, M.; Cornell, C.; Kistler, R.

    1973-01-01

    The MIDAS system is a prototype, multiple-pipeline digital processor mechanizing the multivariate-Gaussian, maximum-likelihood decision algorithm operating at 200,000 pixels/second. It incorporates displays and film printer equipment under control of a general purpose midi-computer and possesses sufficient flexibility that operational versions of the equipment may be subsequently specified as subsets of the system.

  6. Automated digital motion-video abstraction - A fuzzy measure approach

    NASA Technical Reports Server (NTRS)

    Leigh, Albert B.; Pal, Sankar K.

    1992-01-01

    This paper addresses a solution to the problem of scene estimation of motion video data in the fuzzy set theoretic framework. Using fuzzy image feature extractors, a new algorithm is developed to compute the change of information in each of two successive frames to classify scenes. This classification process of raw input visual data can be used to establish structure for correlation. The algorithm attempts to fulfill the need for non-linear, frame-accurate access to video data for applications such as video editing and visual document archival/retrieval systems in multimedia environments.

  7. Video Data Management System Archives and Provides Online Access to NOAA Deep-Sea Corals Digital Video and Image Data

    DTIC Science & Technology

    2008-09-01

    System (OAS) and NCDDC’s MERMAid catalogs, CoRIS and OER Digital Atlas databases. II. VIDEO AND IMAGE DATA MANAGEMENT The primary media currently...protocol. • A crosswalk and converter in the MERMAid system (NCDDC online catalog) enables sharing common metadata in both FGDC and MARC21 metadata...records provide the descriptive information for both NOAALINC and MERMAid metadata discovery tools (Figure 4). Figure 4. FGDC-MARCXML-MARC21 Metadata

  8. Digital video documentation as evidence of clinical skill acquisition.

    PubMed

    Edwards, Simon; Rajaratnam, V

    2009-01-01

    Video recordings have become requirements for the assessment and recording of the consulting skills module of the MRCGP examination and surgical skill modules for the post FRCS hand diploma examination. Previous research has shown that the knowledge and judgement skills needed by trainees to achieve operative competence can be reliably assessed using structured checklists. However evaluation of surgical competency should also include technical skills, which have been difficult to document adequately and transparently. There is now evidence demonstrating that surgeons can discriminate between the video recordings of a competent and non-competent trainee. Like those of previous researchers our findings indicate that intra-operative video monitoring enables an objective and permanent recordable assessment of the a trainees skill level whilst completing the checklist after a particular procedure. Video evidence can also be distributed widely to assessors outside the trainee's locale.

  9. Digital video recording in trauma surgery using commercially available equipment

    PubMed Central

    2013-01-01

    Introduction Although videos of surgical procedures are useful as an educational tool, the recording of trauma surgeries in emergency situations is difficult. We describe an inexpensive and practical shooting method using a commercially available head-mounted video camera. Methods We used a ContourHD 1080p Helmet Camera (Contour Inc., Seattle, Washington, USA.). This small, self-contained video camera and recording system was originally designed for easy videography of outdoor sports by participants. Results We were able to easily make high-quality video recordings of our trauma surgeries, including an emergency room thoracotomy for chest stab wounds and a crush laparoptomy for a severe liver injury. Conclusion There are currently many options for recording surgery in the field, but the recording device and system should be chosen according to the surgical situation. We consider the use of a helmet-mounted, self-contained high-definition video camera-recorder to be an inexpensive, quick, and easy method for recording trauma surgeries. PMID:23578301

  10. A professional and cost effective digital video editing and image storage system for the operating room.

    PubMed

    Scollato, A; Perrini, P; Benedetto, N; Di Lorenzo, N

    2007-06-01

    We propose an easy-to-construct digital video editing system ideal to produce video documentation and still images. A digital video editing system applicable to many video sources in the operating room is described in detail. The proposed system has proved easy to use and permits one to obtain videography quickly and easily. Mixing different streams of video input from all the devices in use in the operating room, the application of filters and effects produces a final, professional end-product. Recording on a DVD provides an inexpensive, portable and easy-to-use medium to store or re-edit or tape at a later time. From stored videography it is easy to extract high-quality, still images useful for teaching, presentations and publications. In conclusion digital videography and still photography can easily be recorded by the proposed system, producing high-quality video recording. The use of firewire ports provides good compatibility with next-generation hardware and software. The high standard of quality makes the proposed system one of the lowest priced products available today.

  11. Real Time Video Bandwidth Compression Using Pseudorandom Sampling Pattern And Image Digitization

    NASA Astrophysics Data System (ADS)

    Li, Yvonne

    1990-01-01

    Pseudorandom sampling pattern and image digitization have been investigated as a technique to reduce the video bandwidth before transmission. Most techniques commonly used involve some sort of transform which makes transmission in real time impossible. In order to transmit in real time, video quality may be affected in one or more of the following ways - possible loss of data during compression; reduction in sharpness of the picture when played back and the possibility of having unwanted video effects such as dot crawling and dot patterning. Hughes Aircraft Company has conducted a study on these video effects versus different sampling techniques and part of the system design is based on their findings. The pseudorandom pattern sampling and image digitization was investigated for the NASA Johnson Space Center as a part of the Space Station development activities. The need for this development is to avoid a signal overload condition in the multiple access communication link. All downlink signals will be assigned levels of priority before transmission and video signals are usually assigned a lower priority. Therefore, the bandwidth available for video transmission will be limited. This creates the situation where an image must be compressed before downlink. The advantage of using the pseudorandom sampling pattern and image digitization technique is that real time information can be obtained and the viewability of the displayed picture can be maximized even in the high compression ratio mode. This report focuses on two main areas the hardware design/implementation and the sampling technique used for the image compression.

  12. Texture analysis in digitally-acquired echocardiographic images: the effect of JPEG compression and video storage.

    PubMed

    Aschkenasy, Schlomo V; Muntwyler, Jorg; van der Loo, Bernd; Oechslin, Erwin; Jenni, Rolf

    2005-03-01

    The analysis of texture in video-stored echocardiographic images is an established method to characterize myocardial pathologies. We investigated whether or not texture parameters calculated from video-stored images and those derived from the joint photographic expert group (JPEG) format compressed data are equivalent to those calculated from uncompressed digital images. Texture parameters were calculated using uncompressed digital data, images stored on videotape, and three forms of compressed digital data (baseline JPEG, JPEG 2000 and lossless JPEG 2000). Video storage heavily affected most texture parameters. Although first-order texture parameters derived from JPEG-compressed images were generally equivalent to those derived from the uncompressed data, several second-order parameters differed significantly. We conclude that texture of video-stored images is not comparable to that of digitally-stored images and that JPEG compression changes important second-order texture parameters. This observation should be taken into account when analyzing texture of modern image data (uncompressed or compressed) and comparing the results with earlier studies utilizing video-stored data.

  13. [Legal aspects of video registration during operations--the digital operating room assistant: opportunity or threat?].

    PubMed

    Blaauw, Claire B; van den Dobbelsteen, John J; Hubben, Joep H

    2011-01-01

    Video registration in hospitals is becoming increasingly frequent and an increasing number of surgical procedures are performed with the help of video imaging. The Technical University of Delft is developing a safety system that will use video images to directly inform medical staff of technical problems during surgery so that necessary adjustments can be made in time: the digital operating room assistant. However, the saving of video images is legally considered to be processing of personal data. Dutch privacy legislation requires that certain legal demands are taken into consideration. From legal point of view three situations can be distinguished where video images are being used: (a) as an essential part of treatment (endoscopic surgery, for example), (b) to enhance the quality of the procedure, and (c) for the purposes of peer assessment or education. To whom and in which way consent has to be asked, differs per situation. We recommend that video recordings of crucial points in the operation are included in the patient file. The same counts for incidental findings or complications if, according to the standard of a good caregiver, this is necessary for the further treatment of the patient. In addition to the doctor and the patient, in certain circumstances, access to the video recordings may also be granted to the Health Care Inspectorate and, to the Public Prosecutor. Covert video recording of an employee is a breach of privacy and essentially punishable by law. Video recordings may not themselves be used to assess the performance of the surgeon involved.

  14. Can Commercial Digital Cameras Be Used as Multispectral Sensors? A Crop Monitoring Test

    PubMed Central

    Lebourgeois, Valentine; Bégué, Agnès; Labbé, Sylvain; Mallavan, Benjamin; Prévot, Laurent; Roux, Bruno

    2008-01-01

    The use of consumer digital cameras or webcams to characterize and monitor different features has become prevalent in various domains, especially in environmental applications. Despite some promising results, such digital camera systems generally suffer from signal aberrations due to the on-board image processing systems and thus offer limited quantitative data acquisition capability. The objective of this study was to test a series of radiometric corrections having the potential to reduce radiometric distortions linked to camera optics and environmental conditions, and to quantify the effects of these corrections on our ability to monitor crop variables. In 2007, we conducted a five-month experiment on sugarcane trial plots using original RGB and modified RGB (Red-Edge and NIR) cameras fitted onto a light aircraft. The camera settings were kept unchanged throughout the acquisition period and the images were recorded in JPEG and RAW formats. These images were corrected to eliminate the vignetting effect, and normalized between acquisition dates. Our results suggest that 1) the use of unprocessed image data did not improve the results of image analyses; 2) vignetting had a significant effect, especially for the modified camera, and 3) normalized vegetation indices calculated with vignetting-corrected images were sufficient to correct for scene illumination conditions. These results are discussed in the light of the experimental protocol and recommendations are made for the use of these versatile systems for quantitative remote sensing of terrestrial surfaces. PMID:27873930

  15. Real-time Digital Video Watermark Embedding System based on Software in Commodity PC

    NASA Astrophysics Data System (ADS)

    Yamada, Takaaki; Echizen, Isao; Tezuka, Satoru; Yoshiura, Hiroshi

    Emerging broadband networks and high performance of PCs provide new business opportunities of the live video streaming services for the Internet users in sport events or in music concerts. Digital watermarking for video helps to protect the copyright of the video content and the real-time processing is an essential requirement. For the small start of new business, it should be achieved by flexible software without special equipments. This paper describes a novel real-time watermarking system implemented on a commodity PC. We propose the system architecture and methods to shorten watermarking time by reusing the estimated watermark imperceptibility among neighboring frames. A prototype system enables real time processing in a series of capturing NTSC signals, watermarking the video, encoding it to MPEG4 in QGVA, 1Mbps, 30fps style and storing the video for 12 hours in maximum

  16. ATM Quality of Service Tests for Digitized Video Using ATM Over Satellite: Laboratory Tests

    NASA Technical Reports Server (NTRS)

    Ivancic, William D.; Brooks, David E.; Frantz, Brian D.

    1997-01-01

    A digitized video application was used to help determine minimum quality of service parameters for asynchronous transfer mode (ATM) over satellite. For these tests, binomially distributed and other errors were digitally inserted in an intermediate frequency link via a satellite modem and a commercial gaussian noise generator. In this paper, the relation- ship between the ATM cell error and cell loss parameter specifications is discussed with regard to this application. In addition, the video-encoding algorithms, test configurations, and results are presented in detail.

  17. Engaging Students in a Physics Course through Use of Digital Video Capture and Analysis

    NASA Astrophysics Data System (ADS)

    Lojewska, Zenobia

    2007-10-01

    Use of digital video motion analysis as a teaching tool in an introductory physics course is presented. The focus of the presentation is the application of digital video technology in a Physics for Movement Science course geared towards Physical Education, Athletic Training and Exercise Science majors. The Dickinson movie set was found to be the most applicable for in-class activities, homework assignments, and projects. Some of the movie clips chosen for analysis are focused on human motion and sports. Additionally, students are starting to capture and analyze their own movie clips.

  18. An integrated multispectral video and environmental monitoring system for the study of coastal processes and the support of beach management operations

    NASA Astrophysics Data System (ADS)

    Ghionis, George; Trygonis, Vassilis; Karydis, Antonis; Vousdoukas, Michalis; Alexandrakis, George; Drakopoulos, Panos; Amdreadis, Olympos; Psarros, Fotis; Velegrakis, Antonis; Poulos, Serafim

    2016-04-01

    Effective beach management requires environmental assessments that are based on sound science, are cost-effective and are available to beach users and managers in an accessible, timely and transparent manner. The most common problems are: 1) The available field data are scarce and of sub-optimal spatio-temporal resolution and coverage, 2) our understanding of local beach processes needs to be improved in order to accurately model/forecast beach dynamics under a changing climate, and 3) the information provided by coastal scientists/engineers in the form of data, models and scientific interpretation is often too complicated to be of direct use by coastal managers/decision makers. A multispectral video system has been developed, consisting of one or more video cameras operating in the visible part of the spectrum, a passive near-infrared (NIR) camera, an active NIR camera system, a thermal infrared camera and a spherical video camera, coupled with innovative image processing algorithms and a telemetric system for the monitoring of coastal environmental parameters. The complete system has the capability to record, process and communicate (in quasi-real time) high frequency information on shoreline position, wave breaking zones, wave run-up, erosion hot spots along the shoreline, nearshore wave height, turbidity, underwater visibility, wind speed and direction, air and sea temperature, solar radiation, UV radiation, relative humidity, barometric pressure and rainfall. An innovative, remotely-controlled interactive visual monitoring system, based on the spherical video camera (with 360°field of view), combines the video streams from all cameras and can be used by beach managers to monitor (in real time) beach user numbers, flow activities and safety at beaches of high touristic value. The high resolution near infrared cameras permit 24-hour monitoring of beach processes, while the thermal camera provides information on beach sediment temperature and moisture, can

  19. Assessment of a Diagnostic Predictive Probability Model Provided by a Multispectral Digital Skin Lesion Analysis Device for Melanoma and Other High-risk Pigmented Lesions and its Impact on Biopsy Decisions

    PubMed Central

    Yoo, Jane; Tucker, Natalie; White, Richard; Rigel, Darrell S.

    2014-01-01

    Objective: Risk prediction models for primary malignant melanoma thus far have relied on qualitative patient information. The authors propose a quantitative diagnostic predictive probability model using Multispectral Digital Skin Lesion Analysis for melanoma and other high-risk pigmented lesions and evaluate its effectiveness optimizing biopsy decisions by dermatologists. Design: Data from 1,632 pigmented lesions analyzed by a Multispectral Digital Skin Lesion Analysis device were used to perform a logistic regression analysis. This new quantitative melanoma or melanoma/atypical melanocytic hyperplasia/high-grade dysplastic nevus probability model was then evaluated to determine its impact on dermatologist decisions to biopsy pigmented lesions clinically suggestive of melanoma. Participants were given an electronic keypad and answered “yes” or “no” if they would biopsy each of 12 pigmented lesions when presented first with patient history, clinical images, and dermoscopic images and again when subsequently shown Multispectral Digital Skin Lesion Analysis data. Setting/participants: Study of 191 dermatologists at a medical conference. Measurements: Sensitivity, specificity, biopsy accuracy, overall biopsy rate, and percentage dermatologists biopsying all five melanomas. Results: Dermatologists were significantly more sensitive, specific, and accurate while decreasing overall biopsy rates with Multispectral Digital Skin Lesion Analysis probability information. Conclusion: Integration of Multispectral Digital Skin Lesion Analysis probability information in the biopsy evaluation and selection process of pigmented lesions has the potential to improve melanoma sensitivity of dermatologists without the concomitant costs associated with additional biopsies being performed. PMID:25584133

  20. Using Digital Video to Promote Teachers' Transformative Learning

    ERIC Educational Resources Information Center

    Calandra, Brendan; Puvirajah, Anton

    2011-01-01

    The authors describe a video-enhanced process for promoting teachers' transformative learning. The non-linear process includes awareness, immersive reflection, and dialogue. The desired result would be holistic change that can be evidenced through change in teaching practice. The article provides a rationale, theoretical support, and some selected…

  1. Using Digital Video to Promote Teachers' Transformative Learning

    ERIC Educational Resources Information Center

    Calandra, Brendan; Puvirajah, Anton

    2011-01-01

    The authors describe a video-enhanced process for promoting teachers' transformative learning. The non-linear process includes awareness, immersive reflection, and dialogue. The desired result would be holistic change that can be evidenced through change in teaching practice. The article provides a rationale, theoretical support, and some selected…

  2. Both Sides of the Interface: Building an Education Interface for a Digital Video Archive with an Interprofessional Group

    ERIC Educational Resources Information Center

    Thompson, Ella Belzberg

    2014-01-01

    In 1999, it was necessary to build an interface for the Shoah Foundation's Visual History Archive (the world's largest digital video archive at the time) that constituted over 120,000 hours of video of over 52,000 video testimonies of Holocaust survivors, rescuers and witnesses. In order to build this educational research interface, an…

  3. Both Sides of the Interface: Building an Education Interface for a Digital Video Archive with an Interprofessional Group

    ERIC Educational Resources Information Center

    Thompson, Ella Belzberg

    2014-01-01

    In 1999, it was necessary to build an interface for the Shoah Foundation's Visual History Archive (the world's largest digital video archive at the time) that constituted over 120,000 hours of video of over 52,000 video testimonies of Holocaust survivors, rescuers and witnesses. In order to build this educational research interface, an…

  4. Ground truth management system to support multispectral scanner /MSS/ digital analysis

    NASA Technical Reports Server (NTRS)

    Coiner, J. C.; Ungar, S. G.

    1977-01-01

    A computerized geographic information system for management of ground truth has been designed and implemented to relate MSS classification results to in situ observations. The ground truth system transforms, generalizes and rectifies ground observations to conform to the pixel size and shape of high resolution MSS aircraft data. These observations can then be aggregated for comparison to lower resolution sensor data. Construction of a digital ground truth array allows direct pixel by pixel comparison between classification results of MSS data and ground truth. By making comparisons, analysts can identify spatial distribution of error within the MSS data as well as usual figures of merit for the classifications. Use of the ground truth system permits investigators to compare a variety of environmental or anthropogenic data, such as soil color or tillage patterns, with classification results and allows direct inclusion of such data into classification operations. To illustrate the system, examples from classification of simulated Thematic Mapper data for agricultural test sites in North Dakota and Kansas are provided.

  5. A high capacity data recording device based on a digital audio processor and a video cassette recorder.

    PubMed Central

    Bezanilla, F

    1985-01-01

    A modified digital audio processor, a video cassette recorder, and some simple added circuitry are assembled into a recording device of high capacity. The unit converts two analog channels into digital form at 44-kHz sampling rate and stores the information in digital form in a common video cassette. Bandwidth of each channel is from direct current to approximately 20 kHz and the dynamic range is close to 90 dB. The total storage capacity in a 3-h video cassette is 2 Gbytes. The information can be retrieved in analog or digital form. PMID:3978213

  6. Enhancing Digital Video Analysis of Bar Kinematics in Weightlifting: A Case Study.

    PubMed

    Dæhlin, Torstein E; Krosshaug, Tron; Chiu, Loren Z F

    2016-08-19

    Weightlifting technique can be objectively assessed from two-dimensional video recordings. Despite its importance, participants' bar trajectories in research involving the snatch or clean exercises are often not reported, potentially due to the time required to digitize video. The purpose of this investigation was to evaluate the use of an LED-based marker, digital video and open source software to automatically track the bar end during weightlifting exercises. A former national-level weightlifter was recorded with a digital video camera performing the snatch, clean and jerk, and squat exercises. An LED-based marker was placed on the right end of the bar. This marker was automatically tracked using two open source software programs to obtain vertical and horizontal position coordinates. The LED-based marker was successfully auto-tracked for all videos over a variety of camera settings. Further, the vertical and horizontal bar displacements and vertical bar velocity were consistent between the two software programs. The present study demonstrates that an LED-based marker can be automatically tracked using open source software. This combination of an LED-based marker, consumer camera and open source software is an accessible, low cost method to objectively evaluate weightlifting technique.

  7. Enhancing Digital Video Analysis of Bar Kinematics in Weightlifting: A Case Study.

    PubMed

    Dæhlin, Torstein E; Krosshaug, Tron; Chiu, Loren Z F

    2017-06-01

    Weightlifting technique can be objectively assessed from two-dimensional video recordings. Despite its importance, participants' bar trajectories in research involving the snatch or clean exercises are often not reported, potentially due to the time required to digitize video. The purpose of this investigation was to evaluate the use of a light-emitting diode (LED)-based marker, digital video, and open-source software to automatically track the bar end during weightlifting exercises. A former national-level weightlifter was recorded with a digital video camera performing the snatch, clean and jerk, and squat exercises. An LED-based marker was placed on the right end of the bar. This marker was automatically tracked using 2 open-source software programs to obtain vertical and horizontal position coordinates. The LED-based marker was successfully auto-tracked for all videos over a variety of camera settings. Furthermore, the vertical and horizontal bar displacements and vertical bar velocity were consistent between the 2 software programs. This study demonstrates that an LED-based marker can be automatically tracked using open-source software. This combination of an LED-based marker, consumer camera, and open-source software is an accessible, low-cost method to objectively evaluate weightlifting technique.

  8. Digital Watermarking: From Concepts to Real-Time Video Applications

    DTIC Science & Technology

    1999-01-01

    includes still-image, video, audio , and geometry data among others-the fundamental con- cept of steganography can be transferred from the field of...used in cryptographic systems. Steganography can be defined as hiding messages in plain sight-that is, rather than encrypting the message, it is embedded...case, the classic medieval palimpsest written in invisible ink on a normal letter. Obviously, manual steganography is a rather tedious and time-consuming

  9. Using Digital Video for Professional Development in Urban Schools: A Preservice Teacher's Experience with Reflection

    ERIC Educational Resources Information Center

    Calandra, Brendan; Brantley-Dias, Laurie; Dias, Michael

    2006-01-01

    This study used a variety of qualitative methods within the context of an exploratory single case study to examine the use of digital video as a means for a preservice teacher to capture personal teaching episodes and reflect on them as an integral part of her professional development. Results demonstrate how an urban preservice teacher's work…

  10. A Software Defined Integrated T1 Digital Network for Voice, Data and Video.

    ERIC Educational Resources Information Center

    Hill, James R.

    The Dallas County Community College District developed and implemented a strategic plan for communications that utilizes a county-wide integrated network to carry voice, data, and video information to nine locations within the district. The network, which was installed and operational by March 1987, utilizes microwave, fiber optics, digital cross…

  11. Re-Articulating the Mission and Work of the Writing Program with Digital Video

    ERIC Educational Resources Information Center

    Kopp, Drew; Stevens, Sharon McKenzie

    2010-01-01

    In this webtext, we discuss one powerful way that writing program administrators (WPAs) can start to reshape their basic rhetorical situation, potentially shifting the underlying premises that external audiences bring to discussions about writing instruction. We argue that digital video, when used strategically, is a particularly valuable medium…

  12. The Digital Video Database: A Virtual Learning Community for Teacher Education

    ERIC Educational Resources Information Center

    So, Winnie Wing-mui; Hung, Vincent Hing-keung; Yip, Walker Yee-wing

    2008-01-01

    This research started with the design and implementation of an online digital video database, followed by a study of how three student teachers used it in building a virtual learning community that enabled the sharing of teaching practices during their first teaching practicum in the teacher education program. The student teachers made use of…

  13. The Affordances of Blogs and Digital Video: New Potentials for Exploring Topics and Representing Meaning

    ERIC Educational Resources Information Center

    Ranker, Jason

    2015-01-01

    In this article, the author presents examples of two ninth-grade students' literacy processes as they used blogs and digital video (amongst other media) to inquire into the subject matter of fast food. The author discusses the students' uses of these focal media through the concept of affordances, a concept that refers to the distinct…

  14. The Role of Narrative in Understanding Digital Video: An Exploratory Analysis.

    ERIC Educational Resources Information Center

    Wilkens, Todd; Hughes, Anthony; Wildemuth, Barbara M.; Marchionini, Gary

    2003-01-01

    Outlines the basic principles and research supporting the concept of narrative intelligence and its applicability to the ways in which people make sense of digital video. Explores relevant theory and research in sense-making, surrogates, narrative, and narrative intelligence and presents preliminary results of two research studies. Results have…

  15. Student Feedback via Screen Capture Digital Video: Stimulating Student's Modified Action

    ERIC Educational Resources Information Center

    Jones, Nigel; Georghiades, Panicos; Gunson, John

    2012-01-01

    A new technique of providing assessment feedback to students is demonstrated via a case study of MBA and undergraduate students. The feedback method uses inexpensive and widely available screen capture digital video technology; it gives the student an impression of being present during the marking process. In addition it enables the tutor to…

  16. The Affordances of Blogs and Digital Video: New Potentials for Exploring Topics and Representing Meaning

    ERIC Educational Resources Information Center

    Ranker, Jason

    2015-01-01

    In this article, the author presents examples of two ninth-grade students' literacy processes as they used blogs and digital video (amongst other media) to inquire into the subject matter of fast food. The author discusses the students' uses of these focal media through the concept of affordances, a concept that refers to the distinct…

  17. Implementing an Educational Digital Video Library Using MPEG-4, SMIL and Web Technologies

    ERIC Educational Resources Information Center

    Milrad, Marcelo; Rossmanith, Philipp; Scholz, Mario

    2005-01-01

    This paper describes the results of our efforts with regard to the design and implementation of an educational digital video library using MPEG-4 and the Synchronized Multimedia Integration Language (SMIL). The aim of our work is to integrate MPEG-4 encoding, full text indexing, high-resolution streaming, and SMIL, not only for delivering on-line…

  18. Video-rate two-photon excited fluorescence lifetime imaging system with interleaved digitization.

    PubMed

    Dow, Ximeng Y; Sullivan, Shane Z; Muir, Ryan D; Simpson, Garth J

    2015-07-15

    A fast (up to video rate) two-photon excited fluorescence lifetime imaging system based on interleaved digitization is demonstrated. The system is compatible with existing beam-scanning microscopes with minor electronics and software modification. Proof-of-concept demonstrations were performed using laser dyes and biological tissue.

  19. Real-time transmission of digital video using variable-length coding

    NASA Technical Reports Server (NTRS)

    Bizon, Thomas P.; Shalkhauser, Mary JO; Whyte, Wayne A., Jr.

    1993-01-01

    Huffman coding is a variable-length lossless compression technique where data with a high probability of occurrence is represented with short codewords, while 'not-so-likely' data is assigned longer codewords. Compression is achieved when the high-probability levels occur so frequently that their benefit outweighs any penalty paid when a less likely input occurs. One instance where Huffman coding is extremely effective occurs when data is highly predictable and differential coding can be applied (as with a digital video signal). For that reason, it is desirable to apply this compression technique to digital video transmission; however, special care must be taken in order to implement a communication protocol utilizing Huffman coding. This paper addresses several of the issues relating to the real-time transmission of Huffman-coded digital video over a constant-rate serial channel. Topics discussed include data rate conversion (from variable to a fixed rate), efficient data buffering, channel coding, recovery from communication errors, decoder synchronization, and decoder architectures. A description of the hardware developed to execute Huffman coding and serial transmission is also included. Although this paper focuses on matters relating to Huffman-coded digital video, the techniques discussed can easily be generalized for a variety of applications which require transmission of variable-length data.

  20. An Evaluation of the Informedia Digital Video Library System at the Open University.

    ERIC Educational Resources Information Center

    Kukulska-Hulme, Agnes; Van der Zwan, Robert; DiPaolo, Terry; Evers, Vanessa; Clarke, Sarah

    1999-01-01

    Reports on an Open University evaluation study of the Informedia Digital Video Library System developed at Carnegie Mellon University (CMU). Findings indicate that there is definite potential for using the system, provided that certain modifications can be made. Results also confirm findings of the Informedia team at CMU that the content of video…

  1. An Evaluation of Streaming Digital Video Resources in On- and Off-Campus Engineering Management Education

    ERIC Educational Resources Information Center

    Palmer, Stuart

    2007-01-01

    A recent television documentary on the Columbia space shuttle disaster was converted to streaming digital video format for educational use by on- and off-campus students in an engineering management study unit examining issues in professional engineering ethics. An evaluation was conducted to assess the effectiveness of this new resource. Use of…

  2. Virtual Worlds and the Learner Hero: How Today's Video Games Can Inform Tomorrow's Digital Learning Environments

    ERIC Educational Resources Information Center

    Rigby, C. Scott; Przybylski, Andrew K.

    2009-01-01

    Participation in expansive video games called "virtual worlds" has become a mainstream leisure activity for tens of millions of people around the world. The growth of this industry and the strong motivational appeal of these digital worlds invite a closer examination as to how educators can learn from today's virtual worlds in the development of…

  3. Bringing Digital Storytelling to the Elementary Classroom: Video Production for Preservice Teachers

    ERIC Educational Resources Information Center

    Shelton, Catharyn C.; Archambault, Leanna M.; Hale, Annie E.

    2017-01-01

    This study presents and evaluates a 7-week learning experience embedded in a required content-area course in a teacher preparation program, in which 31 preservice elementary teachers produced digital storytelling videos and considered how this approach may apply to their future classrooms. Qualitative and quantitative data from preservice…

  4. Digital Video: The Impact on Children's Learning Experiences in Primary Physical Education

    ERIC Educational Resources Information Center

    O'Loughlin, Joe; Chroinin, Deirdre Ni; O'Grady, David

    2013-01-01

    Technology can support teaching, learning and assessment in physical education. The purpose of this study was to examine children's perspectives and experiences of using digital video in primary physical education. The impact on motivation, feedback, self-assessment and learning was examined. Twenty-three children aged 9-10 years participated in a…

  5. Digital Video/Multimedia Portfolios as a Tool To Develop Reflective Teacher Candidates.

    ERIC Educational Resources Information Center

    Spurgeon, Sheila; Bowen, James L.

    This research examined the effects of a process of digital video editing used to create multimedia portfolio has on the quality of teacher candidates' critical reflections. The target population was Northwestern Oklahoma State University teacher candidates. Subjects were 22 student teachers in the fall 2001. Subjects were randomly assigned to one…

  6. A Software Defined Integrated T1 Digital Network for Voice, Data and Video.

    ERIC Educational Resources Information Center

    Hill, James R.

    The Dallas County Community College District developed and implemented a strategic plan for communications that utilizes a county-wide integrated network to carry voice, data, and video information to nine locations within the district. The network, which was installed and operational by March 1987, utilizes microwave, fiber optics, digital cross…

  7. Is It Still Considered Reading? Using Digital Video Storytelling to Engage Adolescent Readers

    ERIC Educational Resources Information Center

    Malin, Ginger

    2010-01-01

    In order to comprehend and ultimately enjoy reading a text, a reader must first be engaged in it. However, many high school students have difficulty engaging with texts for a variety of reasons. This study was interested in innovative solutions to this problem and examined the educational and aesthetic value of a particular digital video reading…

  8. Is It Still Considered Reading? Using Digital Video Storytelling to Engage Adolescent Readers

    ERIC Educational Resources Information Center

    Malin, Ginger

    2010-01-01

    In order to comprehend and ultimately enjoy reading a text, a reader must first be engaged in it. However, many high school students have difficulty engaging with texts for a variety of reasons. This study was interested in innovative solutions to this problem and examined the educational and aesthetic value of a particular digital video reading…

  9. Construction of a Digital Video Library: A Socio-Technical Pilot Study on College Students' Attitudes

    ERIC Educational Resources Information Center

    Chen, Hsin-Liang; Choi, Gilok

    2005-01-01

    This study investigates socio-technical aspects of digital video libraries based on college students' learning experiences and perspectives. Forty-one students in biology classes were studied through a survey and individual interviews. Findings are presented by the students' knowledge of computer technology, experiences with AV materials, and…

  10. Teacher-Created Videos in a Flipped Mathematics Class: Digital Curriculum Materials or Lesson Enactments?

    ERIC Educational Resources Information Center

    de Araujo, Zandra; Otten, Samuel; Birisci, Salih

    2017-01-01

    The rise of digital resources has had profound effects on mathematics curricula and there has been a concurrent increase in teachers flipping their instruction--that is, assigning instructional videos or multimedia for students to watch as homework and completing problem or exercise sets in class rather than vice versa. These changes have created…

  11. An Evaluation of Streaming Digital Video Resources in On- and Off-Campus Engineering Management Education

    ERIC Educational Resources Information Center

    Palmer, Stuart

    2007-01-01

    A recent television documentary on the Columbia space shuttle disaster was converted to streaming digital video format for educational use by on- and off-campus students in an engineering management study unit examining issues in professional engineering ethics. An evaluation was conducted to assess the effectiveness of this new resource. Use of…

  12. Readers, Players, and Watchers: EFL Students' Vocabulary Acquisition through Digital Video Games

    ERIC Educational Resources Information Center

    Ebrahimzadeh, Mohsen

    2017-01-01

    The present study investigated vocabulary acquisition through a commercial digital video game compared to a traditional pencil-and-paper treatment. Chosen through cluster sampling, 241 male high school students (age 12-18) participated in the study. They were randomly assigned to one of the following groups. The first group, called Readers,…

  13. Extending the Flipped Classroom Model: Developing Second Language Writing Skills through Student-Created Digital Videos

    ERIC Educational Resources Information Center

    Engin, Marion

    2014-01-01

    This paper describes a project that aimed to leverage the students' interest and experience of technology and multimodal environments to develop their academic writing skills and second language learning. Students were expected to follow a model, research a topic, and craft a digital video tutorial on an aspect of academic writing which would form…

  14. Construction of a Digital Video Library: A Socio-Technical Pilot Study on College Students' Attitudes

    ERIC Educational Resources Information Center

    Chen, Hsin-Liang; Choi, Gilok

    2005-01-01

    This study investigates socio-technical aspects of digital video libraries based on college students' learning experiences and perspectives. Forty-one students in biology classes were studied through a survey and individual interviews. Findings are presented by the students' knowledge of computer technology, experiences with AV materials, and…

  15. Appropriation, Parody, Gender Play, and Self-Representation in Preadolescents' Digital Video Production

    ERIC Educational Resources Information Center

    Ivashkevich, Olga; Shoppell, Samantha

    2013-01-01

    The authors discuss their participant observation study with the 10-year-old boy and 8-year-old girl who collaborated on making digital videos at home. Major themes that emerged from this research include appropriation of popular culture texts, parody, gender play, and managing self-representations. These themes highlight the benefits of video…

  16. Making Meaning on the Screen: Digital Video Production about the Dominican Republic

    ERIC Educational Resources Information Center

    Ranker, Jason

    2008-01-01

    As part of an inquiry and digital documentary video project, two 12-year-old students studied the Dominican Republic. Over the course of their research, the boys (one of whose parents moved from the Dominican Republic) focused their project on two aspects of the culture of the Dominican Republic: contemporary music (bachata and merengue) and…

  17. Digital Video: The Impact on Children's Learning Experiences in Primary Physical Education

    ERIC Educational Resources Information Center

    O'Loughlin, Joe; Chroinin, Deirdre Ni; O'Grady, David

    2013-01-01

    Technology can support teaching, learning and assessment in physical education. The purpose of this study was to examine children's perspectives and experiences of using digital video in primary physical education. The impact on motivation, feedback, self-assessment and learning was examined. Twenty-three children aged 9-10 years participated in a…

  18. Making Meaning on the Screen: Digital Video Production about the Dominican Republic

    ERIC Educational Resources Information Center

    Ranker, Jason

    2008-01-01

    As part of an inquiry and digital documentary video project, two 12-year-old students studied the Dominican Republic. Over the course of their research, the boys (one of whose parents moved from the Dominican Republic) focused their project on two aspects of the culture of the Dominican Republic: contemporary music (bachata and merengue) and…

  19. Digital holographic video service system for natural color scene

    NASA Astrophysics Data System (ADS)

    Seo, Young-Ho; Lee, Yoon-Hyuk; Koo, Ja-Myung; Kim, Woo-Youl; Yoo, Ji-Sang; Kim, Dong-Wook

    2013-11-01

    We propose a new system that can generate digital holograms using natural color information. The system consists of a camera system for capturing images (object points) and software (S/W) for various image processing. The camera system uses a vertical rig, which is equipped with two depth and RGB cameras and a cold mirror, which has different reflectances according to wavelength for obtaining images with the same viewpoint. The S/W is composed of the engines for processing the captured images and executing computer-generated hologram for generating digital holograms using general-purpose graphics processing units. Each algorithm was implemented using C/C++ and CUDA languages, and all engines in the form of library were integrated in LabView environment. The proposed system can generate about 10 digital holographic frames per second using about 6 K object points.

  20. Digital video system for on-line portal verification

    NASA Astrophysics Data System (ADS)

    Leszczynski, Konrad W.; Shalev, Shlomo; Cosby, N. Scott

    1990-07-01

    A digital system has been developed for on-line acquisition, processing and display of portal images during radiation therapy treatment. A metal/phosphor screen combination is the primary detector, where the conversion from high-energy photons to visible light takes place. A mirror angled at 45 degrees reflects the primary image to a low-light-level camera, which is removed from the direct radiation beam. The image registered by the camera is digitized, processed and displayed on a CRT monitor. Advanced digital techniques for processing of on-line images have been developed and implemented to enhance image contrast and suppress the noise. Some elements of automated radiotherapy treatment verification have been introduced.

  1. Relationships between Student Achievement and Use of Power Videos Digital Educational Videos

    ERIC Educational Resources Information Center

    Sorrells, Rick D.

    2009-01-01

    In classrooms with limited instructional time and many resources, teachers must decide which resources positively affect student achievement. Power Videos (PV), produced by DCS, is one such product used at the 373 elementary campuses in the greater Dallas, Texas, area. This research examined the relationship between teachers' usage of the DCS…

  2. Relationships between Student Achievement and Use of Power Videos Digital Educational Videos

    ERIC Educational Resources Information Center

    Sorrells, Rick D.

    2009-01-01

    In classrooms with limited instructional time and many resources, teachers must decide which resources positively affect student achievement. Power Videos (PV), produced by DCS, is one such product used at the 373 elementary campuses in the greater Dallas, Texas, area. This research examined the relationship between teachers' usage of the DCS…

  3. Social media, digital video and health promotion in a culturally and linguistically diverse Australia.

    PubMed

    O'Mara, Ben

    2013-09-01

    Participatory processes are effective for digital video production that promotes health and wellbeing with communities from diverse cultural and linguistic backgrounds, including migrants and refugees. Social media platforms YouTube, Vimeo, Flickr and others demonstrate potential for extending and enhancing this production approach. However, differences within and between communities in terms of their quality of participation online suggest that social media risk becoming exclusive online environments and a barrier to health and wellbeing promotion. This article examines the literature and recent research and practice in Australia to identify opportunities and challenges when using social media with communities from diverse cultural and linguistic backgrounds. It proposes a hybrid approach for digital video production that integrates 'online' and 'offline' participation and engages with the differences between migrants and refugees to support more inclusive health and wellbeing promotion using digital technology.

  4. Comparison of MPEG digital video with super VHS tape for diagnostic echocardiographic readings

    NASA Technical Reports Server (NTRS)

    Soble, J. S.; Yurow, G.; Brar, R.; Stamos, T.; Neumann, A.; Garcia, M.; Stoddard, M. F.; Cherian, P. K.; Bhamb, B.; Thomas, J. D.

    1998-01-01

    BACKGROUND: Digital recording of echocardiographic studies is on the clinical horizon. However, full digital capture of complete echocardiographic studies in traditional video format is impractical, given current storage capacity and network bandwidth. To overcome these constraints, we evaluated the diagnostic image quality of digital video by using MPEG (Motion Picture Experts Group) compression. METHODS AND RESULTS: Fifty-eight complete, consecutive studies were recorded simultaneously with the use of MPEG-1 and sVHS videotape. Each matched MPEG and sVHS study pair was reviewed by two from a total of six readers, and findings were recorded with the use of a detailed, computerized reporting tool. Intrareader and interreader discrepancies were characterized as major or minor and analyzed in total and for specific subgroups of findings (left and right ventricular parameters, valvular insufficiency, and left ventricular regional wall motion). Intrareader discrepancies were reviewed by a consensus panel for agreement with either MPEG or sVHS findings. There was an exact concordance between MPEG and sVHS readings in 83% of findings. The majority of discrepancies were minor, with major discrepancies in only 2.7% of findings. There was no difference in the rate of consensus panel agreement with MPEG or sVHS for instances of intrareader discrepancy, either in total or for any subgroup of findings. Interreader discrepancy rates were nearly identical for both MPEG and sVHS. CONCLUSIONS: MPEG-1 digital video is equivalent to sVHS videotape for diagnostic echocardiography. MPEG increases the range of practical options for digital echocardiography and offers, for the first time, the advantages of digital recording in a familiar video format.

  5. Comparison of MPEG digital video with super VHS tape for diagnostic echocardiographic readings

    NASA Technical Reports Server (NTRS)

    Soble, J. S.; Yurow, G.; Brar, R.; Stamos, T.; Neumann, A.; Garcia, M.; Stoddard, M. F.; Cherian, P. K.; Bhamb, B.; Thomas, J. D.

    1998-01-01

    BACKGROUND: Digital recording of echocardiographic studies is on the clinical horizon. However, full digital capture of complete echocardiographic studies in traditional video format is impractical, given current storage capacity and network bandwidth. To overcome these constraints, we evaluated the diagnostic image quality of digital video by using MPEG (Motion Picture Experts Group) compression. METHODS AND RESULTS: Fifty-eight complete, consecutive studies were recorded simultaneously with the use of MPEG-1 and sVHS videotape. Each matched MPEG and sVHS study pair was reviewed by two from a total of six readers, and findings were recorded with the use of a detailed, computerized reporting tool. Intrareader and interreader discrepancies were characterized as major or minor and analyzed in total and for specific subgroups of findings (left and right ventricular parameters, valvular insufficiency, and left ventricular regional wall motion). Intrareader discrepancies were reviewed by a consensus panel for agreement with either MPEG or sVHS findings. There was an exact concordance between MPEG and sVHS readings in 83% of findings. The majority of discrepancies were minor, with major discrepancies in only 2.7% of findings. There was no difference in the rate of consensus panel agreement with MPEG or sVHS for instances of intrareader discrepancy, either in total or for any subgroup of findings. Interreader discrepancy rates were nearly identical for both MPEG and sVHS. CONCLUSIONS: MPEG-1 digital video is equivalent to sVHS videotape for diagnostic echocardiography. MPEG increases the range of practical options for digital echocardiography and offers, for the first time, the advantages of digital recording in a familiar video format.

  6. Standardization of End-to-End Performance of Digital Video Teleconferencing/Video Telephony Systems

    DTIC Science & Technology

    1991-12-01

    Teleconferencing, NCS-TIB-90-6, Temporal Frequency as a Technique to Measure the Ability of a Teleconferencing System to Reproduce Motion, NCS-TIB-91...used for most tests. For completeness and ease of reference, the basic parameters of all patterns are repeated on Table 3-3, while a sample of one...video signal which influences the signal-to-noise ratio but does not have primary impact on the ability of the codec to faithfully reproduce a moving

  7. Visualization of fast-moving cells in vivo using digital holographic video microscopy.

    PubMed

    Sun, Hongyue; Song, Bing; Dong, Hongpai; Reid, Brian; Player, Michael A; Watson, John; Zhao, Min

    2008-01-01

    Digital in-line holography offers some significant advantages over conventional optical holography and microscopy to image biological specimens. By combining holography with digital video microscopy, an in-line holographic video microscope is developed and is capable of recording spatial 3D holographic images of biological specimens, while preserving the time dimension. The system enables high-speed video recording of fast cell movement, such as the rapid movement of blood cells in the blood stream in vivo. This capability is demonstrated with observations of fast 3-D movement of live cells in suspension cultures in response to a gentle shake to the Petri dish. The experimental and numerical procedures are incorporated with a fast reconstruction algorithm for reconstruction of holographic video frames at various planes (z axis) from the hologram and along the time axis. The current system enables both lateral and longitudinal resolutions down to a few micrometers. Postreconstruction processing of background subtraction is utilized to eliminate noise caused by scattered light, thereby enabling visualization of, for example, blood streams of live Xenopos tadpoles. The combination of digital holography and microscopy offers unique advantages for imaging of fast moving cells and other biological particles in three dimensions in vivo with high spatial and temporal resolution.

  8. Capture-time indexing paradigm, authoring tool, and browsing environment for digital broadcast video

    NASA Astrophysics Data System (ADS)

    Carreira, Michael; Casebolt, John E.; Desrosiers, Gerard; Little, Thomas D.

    1995-03-01

    Historically, Multimedia Video-on-Demand (VOD) systems have considered stream indexing as an authoring activity, decomposing monolithic streams containing no explicit indexing information. This paper suggests a scheme for 'up-front,' capture-time indexing of digital video streams, whereby the indexing information logically becomes part of the stream. This approach takes advantage of the sequential, temporal nature of capture and the knowledge of the stream recorder to empower further manipulation and playout of the stream. We explore the impact of capture-time indices, and implement a sample format in a Segment Definition File (SDF). The Video Broadcast Authoring Tool (VBAT) is the focus of our paper. Taking a video stream and an SDF as input, VBAT provides a means for authors to create, delete, modify and annotate segments of that stream. VBAT also integrates existing technology such as World-Wide Web's HTTP links and the Motion Picture Parser application. Creation of various-format stills for browsing is supported. VBAT provides for post-processing of the SDF to various playout environments; we implement and describe a postprocessor for World-Wide Web browsing and playout. Finally, we discuss VBAT's position in an integrated digital video broadcast environment and areas of future work.

  9. Digital Video Needs for Oceanographic Images for the National Oceanic and Atmospheric Administration (NOAA): Phase 2

    DTIC Science & Technology

    2003-09-01

    www.lib.noaa.gov) and the worldwide online library catalog, WorldCat (http://www.oclc.org/ worldcat /). WorldCat is the world’s largest and richest database...OE expeditions will also be available through NOAALINC and WorldCat . E. The Digital Atlas Working Group This group has developed a Geographic...future NOAA video portal, and WorldCat . Input will be provided from both the NOAA Data Centers and the Internet for video images. Multi-platform

  10. How and why for the camera-shy: using digital video in psychiatry.

    PubMed

    Falzone, Richard L; Hall, Sarah; Beresin, Eugene V

    2005-07-01

    Videotaping and digital editing (desktop video) provide a therapist with compelling material that can be used for therapy with patients, for teaching and professional presentation, and for therapist development. Despite these advantages, many clinicians are reluctant to record their work for reasons that include self-consciousness on the part of the therapist or patient, concerns about negative effects of videotaping on the session, concerns about confidentiality and legal liability, and lack of familiarity with the process of videotaping and the equipment involved. Understanding the benefits, concerns, and basic process involved in video recording and editing should reduce clinician apprehension and encourage more widespread use of this powerful clinical medium.

  11. High-speed digital video tracking system for generic applications

    NASA Astrophysics Data System (ADS)

    Walton, James S.; Hallamasek, Karen G.

    2001-04-01

    The value of high-speed imaging for making subjective assessments is widely recognized, but the inability to acquire useful data from image sequences in a timely fashion has severely limited the use of the technology. 4DVideo has created a foundation for a generic instrument that can capture kinematic data from high-speed images. The new system has been designed to acquire (1) two-dimensional trajectories of points; (2) three-dimensional kinematics of structures or linked rigid-bodies; and (3) morphological reconstructions of boundaries. The system has been designed to work with an unlimited number of cameras configured as nodes in a network, with each camera able to acquire images at 1000 frames per second (fps) or better, with a spatial resolution of 512 X 512 or better, and an 8-bit gray scale. However, less demanding configurations are anticipated. The critical technology is contained in the custom hardware that services the cameras. This hardware optimizes the amount of information stored, and maximizes the available bandwidth. The system identifies targets using an algorithm implemented in hardware. When complete, the system software will provide all of the functionality required to capture and process video data from multiple perspectives. Thereafter it will extract, edit and analyze the motions of finite targets and boundaries.

  12. Life and times: The development of a digital video surveillance system

    SciTech Connect

    Rodriguez, C.A.

    1994-09-01

    Over the past few years Los Alamos National Laboratory`s Safeguards Systems Group has been working to develop an image-based digital surveillance system designed to provide continuous monitoring of nuclear materials in storage or process. The goal of such a system is to provide automated technologies that will ensure the security of the nuclear materials and ultimately reduce the frequency of required physical inventories. This paper discusses the highlights and low-lights we have encountered while designing, developing, and field-testing a digital video surveillance system.

  13. A digital underwater video camera system for aquatic research in regulated rivers

    USGS Publications Warehouse

    Martin, Benjamin M.; Irwin, Elise R.

    2010-01-01

    We designed a digital underwater video camera system to monitor nesting centrarchid behavior in the Tallapoosa River, Alabama, 20 km below a peaking hydropower dam with a highly variable flow regime. Major components of the system included a digital video recorder, multiple underwater cameras, and specially fabricated substrate stakes. The innovative design of the substrate stakes allowed us to effectively observe nesting redbreast sunfish Lepomis auritus in a highly regulated river. Substrate stakes, which were constructed for the specific substratum complex (i.e., sand, gravel, and cobble) identified at our study site, were able to withstand a discharge level of approximately 300 m3/s and allowed us to simultaneously record 10 active nests before and during water releases from the dam. We believe our technique will be valuable for other researchers that work in regulated rivers to quantify behavior of aquatic fauna in response to a discharge disturbance.

  14. High-speed video imaging and digital analysis of microscopic features in contracting striated muscle cells

    NASA Astrophysics Data System (ADS)

    Roos, Kenneth P.; Taylor, Stuart R.

    1993-02-01

    The rapid motion of microscopic features such as the cross striations of single contracting muscle cells are difficult to capture with conventional optical microscopes, video systems, and image processing approaches. An integrated digital video imaging microscope system specifically designed to capture images from single contracting muscle cells at speeds of up to 240 Hz and to analyze images to extract features critical for the understanding of muscle contraction is described. This system consists of a brightfield microscope with immersion optics coupled to a high-speed charge-coupled device (CCD) video camera, super-VHS (S- VHS) and optical media disk video recording (OMDR) systems, and a semiautomated digital image analysis system. Components are modified to optimize spatial and temporal resolution to permit the evaluation of submicrometer features in real physiological time. This approach permits the critical evaluation of the magnitude, time course, and uniformity of contractile function throughout the volume of a single living cell with higher temporal and spatial resolutions than previously possible.

  15. Let SMIL be your umbrella: software tools for transcribing, coding, and presenting digital video in behavioral research.

    PubMed

    Kumar, Sujai; Miller, Kevin

    2005-05-01

    Video-based techniques have become central to many areas of social science research, although their use has been limited by the expense and complexity of tools for working with video information. New standards for the representation of digital video make the manipulation of video for observational research a far less time-consuming and expensive process than it once was. We provide an overview of SMIL, a cross-platform markup standard, and guidelines on how it can be used to edit, synchronize, caption, and present video clips with no need to modify the original digital video files. We also present TransTool, a free Windows program that can generate SMIL files for playing video clips of interest along with captions and codes. TransTool can also be used as a transcribing and coding tool that synchronizes video and text such as transcripts. These tools greatly facilitate tasks such as creating video events with multilanguage transcripts, showing synchronized views of the same event, quickly extracting clips from longer video files, and incorporating video clips into presentations and web pages. Example SMIL files and the TransTool program can be downloaded from http://www.psych.uiuc.edu/-kmiller/smil.

  16. High-speed digital video imaging system to record cardiac action potentials

    NASA Astrophysics Data System (ADS)

    Mishima, Akira; Arafune, Tatsuhiko; Masamune, Ken; Sakuma, Ichiro; Dohi, Takeyoshi; Shibata, Nitaro; Honjo, Haruo; Kodama, Itsuo

    2001-01-01

    A new digital video imaging system was developed and its performance was evaluated to analyze the spiral wave dynamics during polymorphic ventricular tachycardia (PVT) with high spatio-temporal resolution (1 ms, 0.1 mm). The epicardial surface of isolated rabbit heart stained with di- 4-ANEPPS was illuminated by 72 high-power bluish-green light emitting diodes (BGLED: (lambda) 0 500 nm, 10mw). The emitted fluorescence image (256x256 pixels) passing through a long-pass filter ((lambda) c 660nm) was monitored by a high-speed digital video camera recorder (FASTCAM-Ultima- UV3, Photron) at 1125 fps. The data stored in DRAM were processed by PC for background subtraction. 2D images of excitation wave and single-pixel action potentials at target sites during PVT induced by DC shocks (S2: 10 ms, 20 V) were displayed for 4.5 s. The wave form quality is high enough to observe phase 0 upstroke and to identify repolarization timing. Membrane potentials at the center of spiral were characterized by double-peak or oscillatory depolarization. Singular points during PVT were obtained from isophase mapping. Our new digital video-BGLED system has an advantage over previous ones for more accurate and longer time action potential analysis during spiral wave reentry.

  17. Method and Apparatus for Evaluating the Visual Quality of Processed Digital Video Sequences

    NASA Technical Reports Server (NTRS)

    Watson, Andrew B. (Inventor)

    2002-01-01

    A Digital Video Quality (DVQ) apparatus and method that incorporate a model of human visual sensitivity to predict the visibility of artifacts. The DVQ method and apparatus are used for the evaluation of the visual quality of processed digital video sequences and for adaptively controlling the bit rate of the processed digital video sequences without compromising the visual quality. The DVQ apparatus minimizes the required amount of memory and computation. The input to the DVQ apparatus is a pair of color image sequences: an original (R) non-compressed sequence, and a processed (T) sequence. Both sequences (R) and (T) are sampled, cropped, and subjected to color transformations. The sequences are then subjected to blocking and discrete cosine transformation, and the results are transformed to local contrast. The next step is a time filtering operation which implements the human sensitivity to different time frequencies. The results are converted to threshold units by dividing each discrete cosine transform coefficient by its respective visual threshold. At the next stage the two sequences are subtracted to produce an error sequence. The error sequence is subjected to a contrast masking operation, which also depends upon the reference sequence (R). The masked errors can be pooled in various ways to illustrate the perceptual error over various dimensions, and the pooled error can be converted to a visual quality measure.

  18. Transitioning towards the Digital Native: Examining Digital Technologies, Video Games, and Learning

    ERIC Educational Resources Information Center

    Salomon, John

    2010-01-01

    Although digital technologies have become commonplace among people who grew up around them, little is known about the effect that such technology will have on learners or its impact on traditional methods of educational delivery. This dissertation examines how certain technologies affect digital natives and seeks to understand specific…

  19. In vivo multispectral imaging of the absorption and scattering properties of exposed brain using a digital red-green-blue camera

    NASA Astrophysics Data System (ADS)

    Yoshida, Keiichiro; Ishizuka, Tomohiro; Mizushima, Chiharu; Nishidate, Izumi; Kawauchi, Satoko; Sato, Shunichi; Sato, Manabu

    2015-04-01

    To evaluate multi-spectral images of the absorption and scattering properties in the cerebral cortex of rat brain, we investigated spectral reflectance images estimated by the Wiener estimation method using a digital red-green-blue camera. A Monte Carlo simulation-based multiple regression analysis for the corresponding spectral absorbance images at nine wavelengths (500, 520, 540, 560, 570, 580, 600, 730, and 760 nm) was then used to specify the absorption and scattering parameters. The spectral images of absorption and reduced scattering coefficients were reconstructed from the absorption and scattering parameters. We performed in vivo experiments on exposed rat brain to confirm the feasibility of this method. The estimated images of the absorption coefficients were dominated by hemoglobin spectra. The estimated images of the reduced scattering coefficients had a broad scattering spectrum, exhibiting a larger magnitude at shorter wavelengths, corresponding to the typical spectrum of brain tissue published in the literature.

  20. Geologic analyses of LANDSAT-1 multispectral imagery of a possible power plant site employing digital and analog image processing. [in Pennsylvania

    NASA Technical Reports Server (NTRS)

    Lovegreen, J. R.; Prosser, W. J.; Millet, R. A.

    1975-01-01

    A site in the Great Valley subsection of the Valley and Ridge physiographic province in eastern Pennsylvania was studied to evaluate the use of digital and analog image processing for geologic investigations. Ground truth at the site was obtained by a field mapping program, a subsurface exploration investigation and a review of available published and unpublished literature. Remote sensing data were analyzed using standard manual techniques. LANDSAT-1 imagery was analyzed using digital image processing employing the multispectral Image 100 system and using analog color processing employing the VP-8 image analyzer. This study deals primarily with linears identified employing image processing and correlation of these linears with known structural features and with linears identified manual interpretation; and the identification of rock outcrops in areas of extensive vegetative cover employing image processing. The results of this study indicate that image processing can be a cost-effective tool for evaluating geologic and linear features for regional studies encompassing large areas such as for power plant siting. Digital image processing can be an effective tool for identifying rock outcrops in areas of heavy vegetative cover.

  1. Digital CODEC for real-time processing of broadcast quality video signals at 1.8 bits/pixel

    NASA Technical Reports Server (NTRS)

    Shalkhauser, Mary JO; Whyte, Wayne A.

    1991-01-01

    Advances in very large scale integration and recent work in the field of bandwidth efficient digital modulation techniques have combined to make digital video processing technically feasible an potentially cost competitive for broadcast quality television transmission. A hardware implementation was developed for DPCM (differential pulse code midulation)-based digital television bandwidth compression algorithm which processes standard NTSC composite color television signals and produces broadcast quality video in real time at an average of 1.8 bits/pixel. The data compression algorithm and the hardware implementation of the codec are described, and performance results are provided.

  2. Digital CODEC for real-time processing of broadcast quality video signals at 1.8 bits/pixel

    NASA Technical Reports Server (NTRS)

    Shalkhauser, Mary JO; Whyte, Wayne A., Jr.

    1989-01-01

    Advances in very large-scale integration and recent work in the field of bandwidth efficient digital modulation techniques have combined to make digital video processing technically feasible and potentially cost competitive for broadcast quality television transmission. A hardware implementation was developed for a DPCM-based digital television bandwidth compression algorithm which processes standard NTSC composite color television signals and produces broadcast quality video in real time at an average of 1.8 bits/pixel. The data compression algorithm and the hardware implementation of the CODEC are described, and performance results are provided.

  3. RINSE: A digitally implemented flywheel sync regenerator for improved video synchroniser performance

    NASA Astrophysics Data System (ADS)

    Evans, Richard H.

    Microwave links are widely used at live outside broadcast events for carrying video signals from mobile cameras such as those carried on the shoulder or fitted to vehicles. A digital frame store synchronizer is required when using a remote radio-camera and this has caused additional problems with variable quality signals. During moments of weak signal strength when threshold noise appears in the picture, a video synchronizer may lose synchronization and produce an unnatural freeze-frame effect. A new device called RINSE (Regeneration and Insertion of New Sync Equipment) is described which replaces the old variable quality syncs with 'flywheel' regenerated syncs. When connected between the microwave receiver and the synchronizer, it cleans up the syncs and allows the synchronizer to pass the video without the freeze frame artifacts which would further degrade the picture. By operating the synchronizer with an external sync input from RINSE it will carry any video signal transparently for a short time irrespective of the noise level.

  4. Techniques for transmitting digital data on the Spacelab's analog video channel

    NASA Technical Reports Server (NTRS)

    Smith, Dean L.; Hanby, Walter D.

    1993-01-01

    A study was made of various techniques for transmitting digital data over a composite video channel. Transmitting data from experiments on the Space Shuttle Orbiter over a video channel is attractive since extra channel capacity is needed. Broadcast television telecommunications schemes and other techniques described in the literature were reviewed and compared. PSK (Phase Shift Keying), MPSK (m-ary PSK), or PAM (Pulse Amplitude Modulation) can be transmitted on visible lines of a frame, unassigned lines of the VBI (Vertical Blanking Interval), or during the HBI (Horizontal Blanking Interval). All three modulation techniques can be attractive under the proper conditions. However, PAM on visible lines or during the VBI should be relatively easy to implement, provide adequate average data rates, and give acceptable BERs (Bit Error Rates).

  5. Techniques for transmitting digital data on the Spacelab's analog video channel

    NASA Technical Reports Server (NTRS)

    Smith, Dean L.; Hanby, Walter D.

    1993-01-01

    A study was made of various techniques for transmitting digital data over a composite video channel. Transmitting data from experiments on the Space Shuttle Orbiter over a video channel is attractive since extra channel capacity is needed. Broadcast television telecommunications schemes and other techniques described in the literature were reviewed and compared. PSK (Phase Shift Keying), MPSK (m-ary PSK), or PAM (Pulse Amplitude Modulation) can be transmitted on visible lines of a frame, unassigned lines of the VBI (Vertical Blanking Interval), or during the HBI (Horizontal Blanking Interval). All three modulation techniques can be attractive under the proper conditions. However, PAM on visible lines or during the VBI should be relatively easy to implement, provide adequate average data rates, and give acceptable BERs (Bit Error Rates).

  6. Embedding Digital Literacies in English Language Teaching: Students' Digital Video Projects as Multimodal Ensembles

    ERIC Educational Resources Information Center

    Hafner, Christoph A.

    2014-01-01

    As a result of recent developments in digital technologies, new genres as well as new contexts for communication are emerging. In view of these developments, this article argues that the scope of English language teaching be expanded beyond the traditional focus on speech and writing to the production of multimodal ensembles, drawing on a range of…

  7. Embedding Digital Literacies in English Language Teaching: Students' Digital Video Projects as Multimodal Ensembles

    ERIC Educational Resources Information Center

    Hafner, Christoph A.

    2014-01-01

    As a result of recent developments in digital technologies, new genres as well as new contexts for communication are emerging. In view of these developments, this article argues that the scope of English language teaching be expanded beyond the traditional focus on speech and writing to the production of multimodal ensembles, drawing on a range of…

  8. High-resolution, high-speed, three-dimensional video imaging with digital fringe projection techniques.

    PubMed

    Ekstrand, Laura; Karpinsky, Nikolaus; Wang, Yajun; Zhang, Song

    2013-12-03

    Digital fringe projection (DFP) techniques provide dense 3D measurements of dynamically changing surfaces. Like the human eyes and brain, DFP uses triangulation between matching points in two views of the same scene at different angles to compute depth. However, unlike a stereo-based method, DFP uses a digital video projector to replace one of the cameras(1). The projector rapidly projects a known sinusoidal pattern onto the subject, and the surface of the subject distorts these patterns in the camera's field of view. Three distorted patterns (fringe images) from the camera can be used to compute the depth using triangulation. Unlike other 3D measurement methods, DFP techniques lead to systems that tend to be faster, lower in equipment cost, more flexible, and easier to develop. DFP systems can also achieve the same measurement resolution as the camera. For this reason, DFP and other digital structured light techniques have recently been the focus of intense research (as summarized in(1-5)). Taking advantage of DFP, the graphics processing unit, and optimized algorithms, we have developed a system capable of 30 Hz 3D video data acquisition, reconstruction, and display for over 300,000 measurement points per frame(6,7). Binary defocusing DFP methods can achieve even greater speeds(8). Diverse applications can benefit from DFP techniques. Our collaborators have used our systems for facial function analysis(9), facial animation(10), cardiac mechanics studies(11), and fluid surface measurements, but many other potential applications exist. This video will teach the fundamentals of DFP techniques and illustrate the design and operation of a binary defocusing DFP system.

  9. Rocket engine plume diagnostics using video digitization and image processing - Analysis of start-up

    NASA Technical Reports Server (NTRS)

    Disimile, P. J.; Shoe, B.; Dhawan, A. P.

    1991-01-01

    Video digitization techniques have been developed to analyze the exhaust plume of the Space Shuttle Main Engine. Temporal averaging and a frame-by-frame analysis provide data used to evaluate the capabilities of image processing techniques for use as measurement tools. Capabilities include the determination of the necessary time requirement for the Mach disk to obtain a fully-developed state. Other results show the Mach disk tracks the nozzle for short time intervals, and that dominate frequencies exist for the nozzle and Mach disk movement.

  10. Very High-Speed Digital Video Capability for In-Flight Use

    NASA Technical Reports Server (NTRS)

    Corda, Stephen; Tseng, Ting; Reaves, Matthew; Mauldin, Kendall; Whiteman, Donald

    2006-01-01

    digital video camera system has been qualified for use in flight on the NASA supersonic F-15B Research Testbed aircraft. This system is capable of very-high-speed color digital imaging at flight speeds up to Mach 2. The components of this system have been ruggedized and shock-mounted in the aircraft to survive the severe pressure, temperature, and vibration of the flight environment. The system includes two synchronized camera subsystems installed in fuselage-mounted camera pods (see Figure 1). Each camera subsystem comprises a camera controller/recorder unit and a camera head. The two camera subsystems are synchronized by use of an MHub(TradeMark) synchronization unit. Each camera subsystem is capable of recording at a rate up to 10,000 pictures per second (pps). A state-of-the-art complementary metal oxide/semiconductor (CMOS) sensor in the camera head has a maximum resolution of 1,280 1,024 pixels at 1,000 pps. Exposure times of the electronic shutter of the camera range from 1/200,000 of a second to full open. The recorded images are captured in a dynamic random-access memory (DRAM) and can be downloaded directly to a personal computer or saved on a compact flash memory card. In addition to the high-rate recording of images, the system can display images in real time at 30 pps. Inter Range Instrumentation Group (IRIG) time code can be inserted into the individual camera controllers or into the M-Hub unit. The video data could also be used to obtain quantitative, three-dimensional trajectory information. The first use of this system was in support of the Space Shuttle Return to Flight effort. Data were needed to help in understanding how thermally insulating foam is shed from a space shuttle external fuel tank during launch. The cameras captured images of simulated external tank debris ejected from a fixture mounted under the centerline of the F-15B aircraft. Digital video was obtained at subsonic and supersonic flight conditions, including speeds up to Mach 2

  11. CTS digital video college curriculum-sharing experiment. [Communications Technology Satellite

    NASA Technical Reports Server (NTRS)

    Lumb, D. R.; Sites, M. J.

    1974-01-01

    NASA-Ames Research Center, Stanford University, and Carleton University, Ottawa, Canada, are participating in a joint experiment to evaluate the feasibility and effectiveness of college curriculum sharing using compressed digital television and the Communications Technology Satellite (CTS). Each university will offer televised courses to the other during the 1976-1977 academic year via CTS, a joint program by NASA and the Canadian Department of Communications. The video compression techniques to be demonstrated will enable economical interconnection of educational institutions using existing and planned domestic satellites.

  12. CTS digital video college curriculum-sharing experiment. [Communications Technology Satellite

    NASA Technical Reports Server (NTRS)

    Lumb, D. R.; Sites, M. J.

    1974-01-01

    NASA-Ames Research Center, Stanford University, and Carleton University, Ottawa, Canada, are participating in a joint experiment to evaluate the feasibility and effectiveness of college curriculum sharing using compressed digital television and the Communications Technology Satellite (CTS). Each university will offer televised courses to the other during the 1976-1977 academic year via CTS, a joint program by NASA and the Canadian Department of Communications. The video compression techniques to be demonstrated will enable economical interconnection of educational institutions using existing and planned domestic satellites.

  13. Linear Calibration of Radiographic Mineral Density Using Video-Digitizing Methods

    NASA Technical Reports Server (NTRS)

    Martin, R. Bruce; Papamichos, Thomas; Dannucci, Greg A.

    1990-01-01

    Radiographic images can provide quantitative as well as qualitative information if they are subjected to densitometric analysis. Using modern video-digitizing techniques, such densitometry can be readily accomplished using relatively inexpensive computer systems. However, such analyses are made more difficult by the fact that the density values read from the radiograph have a complex, nonlinear relationship to bone mineral content. This article derives the relationship between these variables from the nature of the intermediate physical processes, and presents a simple mathematical method for obtaining a linear calibration function using a step wedge or other standard.

  14. Linear Calibration of Radiographic Mineral Density Using Video-Digitizing Methods

    NASA Technical Reports Server (NTRS)

    Martin, R. Bruce; Papamichos, Thomas; Dannucci, Greg A.

    1990-01-01

    Radiographic images can provide quantitative as well as qualitative information if they are subjected to densitometric analysis. Using modem video-digitizing techniques, such densitometry can be readily accomplished using relatively inexpensive computer systems. However, such analyses are made more difficult by the fact that the density values read from the radiograph have a complex, nonlinear relationship to bone mineral content. This article derives the relationship between these variables from the nature of the intermediate physical processes, and presents a simple mathematical method for obtaining a linear calibration function using a step wedge or other standard.

  15. Linear Calibration of Radiographic Mineral Density Using Video-Digitizing Methods

    NASA Technical Reports Server (NTRS)

    Martin, R. Bruce; Papamichos, Thomas; Dannucci, Greg A.

    1990-01-01

    Radiographic images can provide quantitative as well as qualitative information if they are subjected to densitometric analysis. Using modem video-digitizing techniques, such densitometry can be readily accomplished using relatively inexpensive computer systems. However, such analyses are made more difficult by the fact that the density values read from the radiograph have a complex, nonlinear relationship to bone mineral content. This article derives the relationship between these variables from the nature of the intermediate physical processes, and presents a simple mathematical method for obtaining a linear calibration function using a step wedge or other standard.

  16. Linear Calibration of Radiographic Mineral Density Using Video-Digitizing Methods

    NASA Technical Reports Server (NTRS)

    Martin, R. Bruce; Papamichos, Thomas; Dannucci, Greg A.

    1990-01-01

    Radiographic images can provide quantitative as well as qualitative information if they are subjected to densitometric analysis. Using modern video-digitizing techniques, such densitometry can be readily accomplished using relatively inexpensive computer systems. However, such analyses are made more difficult by the fact that the density values read from the radiograph have a complex, nonlinear relationship to bone mineral content. This article derives the relationship between these variables from the nature of the intermediate physical processes, and presents a simple mathematical method for obtaining a linear calibration function using a step wedge or other standard.

  17. Rocket engine plume diagnostics using video digitization and image processing - Analysis of start-up

    NASA Technical Reports Server (NTRS)

    Disimile, P. J.; Shoe, B.; Dhawan, A. P.

    1991-01-01

    Video digitization techniques have been developed to analyze the exhaust plume of the Space Shuttle Main Engine. Temporal averaging and a frame-by-frame analysis provide data used to evaluate the capabilities of image processing techniques for use as measurement tools. Capabilities include the determination of the necessary time requirement for the Mach disk to obtain a fully-developed state. Other results show the Mach disk tracks the nozzle for short time intervals, and that dominate frequencies exist for the nozzle and Mach disk movement.

  18. Multispectral Internet imaging

    NASA Astrophysics Data System (ADS)

    Brettel, Hans; Schmitt, Francis J. M.

    2000-12-01

    We present a system for multispectral image acquisition which is accessible via an Internet connection. The system includes an electronically tunable spectral filter and a monochrome digital camera, both controlled from a PC-type computer acting as a Web server. In contrast to the three fixed color channels of an ordinary WebCam, our system provides a virtually unlimited number of spectral channels. To allow for interactive use of this multispectral image acquisition system through the network, we developed a set of Java servlets which provide access to the system through HyperText Transfer Protocol (HTTP) requests. Since only the standard Common Gateway Interface (CGI) mechanisms for client-server communication are used, the system is accessible from any Web browser.

  19. Mutual information registration of multi-spectral and multi-resolution images of DigitalGlobe's WorldView-3 imaging satellite

    NASA Astrophysics Data System (ADS)

    Miecznik, Grzegorz; Shafer, Jeff; Baugh, William M.; Bader, Brett; Karspeck, Milan; Pacifici, Fabio

    2017-05-01

    WorldView-3 (WV-3) is a DigitalGlobe commercial, high resolution, push-broom imaging satellite with three instruments: visible and near-infrared VNIR consisting of panchromatic (0.3m nadir GSD) plus multi-spectral (1.2m), short-wave infrared SWIR (3.7m), and multi-spectral CAVIS (30m). Nine VNIR bands, which are on one instrument, are nearly perfectly registered to each other, whereas eight SWIR bands, belonging to the second instrument, are misaligned with respect to VNIR and to each other. Geometric calibration and ortho-rectification results in a VNIR/SWIR alignment which is accurate to approximately 0.75 SWIR pixel at 3.7m GSD, whereas inter-SWIR, band to band registration is 0.3 SWIR pixel. Numerous high resolution, spectral applications, such as object classification and material identification, require more accurate registration, which can be achieved by utilizing image processing algorithms, for example Mutual Information (MI). Although MI-based co-registration algorithms are highly accurate, implementation details for automated processing can be challenging. One particular challenge is how to compute bin widths of intensity histograms, which are fundamental building blocks of MI. We solve this problem by making the bin widths proportional to instrument shot noise. Next, we show how to take advantage of multiple VNIR bands, and improve registration sensitivity to image alignment. To meet this goal, we employ Canonical Correlation Analysis, which maximizes VNIR/SWIR correlation through an optimal linear combination of VNIR bands. Finally we explore how to register images corresponding to different spatial resolutions. We show that MI computed at a low-resolution grid is more sensitive to alignment parameters than MI computed at a high-resolution grid. The proposed modifications allow us to improve VNIR/SWIR registration to better than ¼ of a SWIR pixel, as long as terrain elevation is properly accounted for, and clouds and water are masked out.

  20. Kohlhase and Spehalski hold Cassini's Digital Video Disk in the PHSF

    NASA Technical Reports Server (NTRS)

    1997-01-01

    In the Payload Hazardous Servicing Facility (PHSF), Charley Kohlhase, Cassini's science and mission design manager, and Richard Spehalski, program manager of the Cassini mission at NASA's Jet Propulsion Laboratory in Pasadena, Calif., hold the Digital Video Disk (DVD) bearing 616,400 digitized signatures from people around the world which will soon be attached to the Cassini spacecraft in the background. Kohlhase oversaw the signature disk development. The two-story-tall spacecraft is scheduled for launch on an Air Force Titan IV/Centaur launch vehicle on Oct. 6, 1997, and destined to arrive at Saturn in July 2004, where it will orbit and study Saturn, its rings, moons, and magnetic environment in detail over a four-year period. The Cassini mission is managed for NASA by the Jet Propulsion Laboratory, a division of the California Institute of Technology.

  1. MIDAS prototype Multispectral Interactive Digital Analysis System for large area earth resources surveys. Volume 2: Charge coupled device investigation

    NASA Technical Reports Server (NTRS)

    Kriegler, F.; Marshall, R.; Sternberg, S.

    1976-01-01

    MIDAS is a third-generation, fast, low cost, multispectral recognition system able to keep pace with the large quantity and high rates of data acquisition from large regions with present and projected sensors. MIDAS, for example, can process a complete ERTS frame in forty seconds and provide a color map of sixteen constituent categories in a few minutes. A principal objective of the MIDAS Program is to provide a system well interfaced with the human operator and thus to obtain large overall reductions in turn-around time and significant gains in throughput. The need for advanced onboard spacecraft processing of remotely sensed data is stated and approaches to this problem are described which are feasible through the use of charge coupled devices. Tentative mechanizations for the required processing operations are given in large block form. These initial designs can serve as a guide to circuit/system designers.

  2. Using Digital Time-Lapse Videos to Teach Geomorphic Processes to Undergraduates

    NASA Astrophysics Data System (ADS)

    Clark, D. H.; Linneman, S. R.; Fuller, J.

    2004-12-01

    We demonstrate the use of relatively low-cost, computer-based digital imagery to create time-lapse videos of two distinct geomorphic processes in order to help students grasp the significance of the rates, styles, and temporal dependence of geologic phenomena. Student interviews indicate that such videos help them to understand the relationship between processes and landform development. Time-lapse videos have been used extensively in some sciences (e.g., biology - http://sbcf.iu.edu/goodpract/hangarter.html, meteorology - http://www.apple.com/education/hed/aua0101s/meteor/, chemistry - http://www.chem.yorku.ca/profs/hempsted/chemed/home.html) to demonstrate gradual processes that are difficult for many students to visualize. Most geologic processes are slower still, and are consequently even more difficult for students to grasp, yet time-lapse videos are rarely used in earth science classrooms. The advent of inexpensive web-cams and computers provides a new means to explore the temporal dimension of earth surface processes. To test the use of time-lapse videos in geoscience education, we are developing time-lapse movies that record the evolution of two landforms: a stream-table delta and a large, natural, active landslide. The former involves well-known processes in a controlled, repeatable laboratory experiment, whereas the latter tracks the developing dynamics of an otherwise poorly understood slope failure. The stream-table delta is small and grows in ca. 2 days; we capture a frame on an overhead web-cam every 3 minutes. Before seeing the video, students are asked to hypothesize how the delta will grow through time. The final time-lapse video, ca. 20-80 MB, elegantly shows channel migration, progradation rates, and formation of major geomorphic elements (topset, foreset, bottomset beds). The web-cam can also be "zoomed-in" to show smaller-scale processes, such as bedload transfer, and foreset slumping. Post-lab tests and interviews with students indicate that

  3. Hybrid digital-analog video transmission in wireless multicast and multiple-input multiple-output system

    NASA Astrophysics Data System (ADS)

    Liu, Yu; Lin, Xiaocheng; Fan, Nianfei; Zhang, Lin

    2016-01-01

    Wireless video multicast has become one of the key technologies in wireless applications. But the main challenge of conventional wireless video multicast, i.e., the cliff effect, remains unsolved. To overcome the cliff effect, a hybrid digital-analog (HDA) video transmission framework based on SoftCast, which transmits the digital bitstream with the quantization residuals, is proposed. With an effective power allocation algorithm and appropriate parameter settings, the residual gains can be maximized; meanwhile, the digital bitstream can assure transmission of a basic video to the multicast receiver group. In the multiple-input multiple-output (MIMO) system, since nonuniform noise interference on different antennas can be regarded as the cliff effect problem, ParCast, which is a variation of SoftCast, is also applied to video transmission to solve it. The HDA scheme with corresponding power allocation algorithms is also applied to improve video performance. Simulations show that the proposed HDA scheme can overcome the cliff effect completely with the transmission of residuals. What is more, it outperforms the compared WSVC scheme by more than 2 dB when transmitting under the same bandwidth, and it can further improve performance by nearly 8 dB in MIMO when compared with the ParCast scheme.

  4. Remote sensing for precision agriculture: Within-field spatial variability analysis and mapping with aerial digital multispectral images

    NASA Astrophysics Data System (ADS)

    Gopalapillai, Sreekala

    2000-10-01

    Advances in remote sensing technology and biological sensors provided the motivation for this study on the applications of aerial multispectral remote sensing in precision agriculture. The feasibility of using high-resolution multispectral remote sensing for precision farming applications such as soil type delineation, identification of crop nitrogen levels, and modeling and mapping of weed density distribution and yield potential within a crop field was explored in this study. Some of the issues such as image calibration for variable lighting conditions and soil background influence were also addressed. Intensity normalization and band ratio methods were found to be adequate image calibration methods to compensate for variable illumination and soil background influence. Several within-field variability factors such as growth stage, field conditions, nutrient availability, crop cultivar, and plant population were found to be dominant in different periods. Unsupervised clustering of color infrared (CIR) image of a field soil was able to identify soil mapping units with an average accuracy of 76%. Spectral reflectance from a crop field was highly correlated to the chlorophyll reading. A regression model developed to predict nitrogen stress in corn identified nitrogen-stressed areas from nitrogen-sufficient areas with a high accuracy (R2 = 0.93). Weed density was highly correlated to the spectral reflectance from a field. One month after planting was found to be a good time to map spatial weed density. The optimum range of resolution for weed mapping was 4 m to 4.5 m for the remote sensing system and the experimental field used in this study. Analysis of spatial yield with respect to spectral reflectance showed that the visible and NIR reflectance were negatively correlated to yield and crop population in heavily weed-infested areas. The yield potential was highly correlated to image indices, especially to normalized brightness. The ANN model developed for one of the

  5. Multispectral Photography

    NASA Technical Reports Server (NTRS)

    1982-01-01

    Model II Multispectral Camera is an advanced aerial camera that provides optimum enhancement of a scene by recording spectral signatures of ground objects only in narrow, preselected bands of the electromagnetic spectrum. Its photos have applications in such areas as agriculture, forestry, water pollution investigations, soil analysis, geologic exploration, water depth studies and camouflage detection. The target scene is simultaneously photographed in four separate spectral bands. Using a multispectral viewer, such as their Model 75 Spectral Data creates a color image from the black and white positives taken by the camera. With this optical image analysis unit, all four bands are superimposed in accurate registration and illuminated with combinations of blue green, red, and white light. Best color combination for displaying the target object is selected and printed. Spectral Data Corporation produces several types of remote sensing equipment and also provides aerial survey, image processing and analysis and number of other remote sensing services.

  6. Research on enhancing the utilization of digital multispectral data and geographic information systems in global habitability studies

    NASA Technical Reports Server (NTRS)

    Martinko, E. A.; Merchant, J. W.

    1986-01-01

    The University of Kansas Applied Remote Sensing (KARS) program is engaged in a continuing long term research and development effort designed to reveal and facilitate new applications of remote sensing technology for decision makers in governmental agencies and private firms. Some objectives of the program follows. The development of new modes of analyzing multispectral scanner, aerial camera, thermal scanner, and radar data, singly or in concert in order to more effectively use these systems. Merge data derived from remote sensing with data derived from conventional sources in geographic information systems to facilitate better environmental planning. Stimulation of the application of the products of remote sensing systems to problems of resource management and environmental quality now being addressed in NASA's Global Habitability directive. The application of remote sensing techniques and analysis and geographic information systems technology to the solution of significant concerns of state and local officials and private industry. The guidance, assistance and stimulation of faculty, staff and students in the utilization of information from the Earth Resources Satellite (LANDSAT) and Aircraft Programs of NASA in research, education, and public service activities carried at the University of Kansas.

  7. Students' Readiness to Move from Consumers to Producers of Digital Video Content: A Cross-Cultural Analysis of Irish and Indian Students

    ERIC Educational Resources Information Center

    Loftus, Maria; Tiernan, Peter; Cherian, Sebastian

    2014-01-01

    Evidence has shown that students have greatly increased their consumption of digital video, principally through video sharing sites. In parallel, students' participation in video sharing and creation has also risen. As educators, we need to question how this can be effectively translated into a positive learning experience for students, whilst…

  8. Students' Readiness to Move from Consumers to Producers of Digital Video Content: A Cross-Cultural Analysis of Irish and Indian Students

    ERIC Educational Resources Information Center

    Loftus, Maria; Tiernan, Peter; Cherian, Sebastian

    2014-01-01

    Evidence has shown that students have greatly increased their consumption of digital video, principally through video sharing sites. In parallel, students' participation in video sharing and creation has also risen. As educators, we need to question how this can be effectively translated into a positive learning experience for students, whilst…

  9. Digit ratio (2D:4D), aggression, and testosterone in men exposed to an aggressive video stimulus.

    PubMed

    Kilduff, Liam P; Hopp, Renato N; Cook, Christian J; Crewther, Blair T; Manning, John T

    2013-10-10

    The relative lengths of the 2(nd) and 4(th) digits (2D:4D) is a negative biomarker for prenatal testosterone, and low 2D:4D may be associated with aggression. However, the evidence for a 2D:4D-aggression association is mixed. Here we test the hypothesis that 2D:4D is robustly linked to aggression in "challenge" situations in which testosterone is increased. Participants were exposed to an aggressive video and a control video. Aggression was measured after each video and salivary free testosterone levels before and after each video. Compared to the control video, the aggressive video was associated with raised aggression responses and a marginally significant increase in testosterone. Left 2D:4D was negatively correlated with aggression after the aggressive video and the strength of the correlation was higher in those participants who showed the greatest increases in testosterone. Left 2D:4D was also negatively correlated to the difference between aggression scores in the aggressive and control conditions. The control video did not influence testosterone concentrations and there were no associations between 2D:4D and aggression. We conclude that 2D:4D moderates the impact of an aggressive stimulus on aggression, such that an increase in testosterone resulting from a "challenge" is associated with a negative correlation between 2D:4D and aggression.

  10. School-Context Videos in Janus-Faced Online Publicity: Learner-Generated Digital Video Production Going Online

    ERIC Educational Resources Information Center

    Palmgren-Neuvonen, Laura; Jaakkola, Maarit; Korkeamäki, Riitta-Liisa

    2015-01-01

    This article reports a case study on sChOOLtv, an online television for primary and secondary schools that aims to bridge the media gap between in-school and out-of-school learning environments. Contrary to its creators' expectations, the number of published videos has not increased since its establishment. Furthermore, the videos were mostly…

  11. School-Context Videos in Janus-Faced Online Publicity: Learner-Generated Digital Video Production Going Online

    ERIC Educational Resources Information Center

    Palmgren-Neuvonen, Laura; Jaakkola, Maarit; Korkeamäki, Riitta-Liisa

    2015-01-01

    This article reports a case study on sChOOLtv, an online television for primary and secondary schools that aims to bridge the media gap between in-school and out-of-school learning environments. Contrary to its creators' expectations, the number of published videos has not increased since its establishment. Furthermore, the videos were mostly…

  12. Digital video recordings for training, assessment, and revalidation of surgical skills.

    PubMed

    Gambadauro, Pietro; Magos, Adam

    2010-10-01

    Surgical training is undergoing drastic changes, and new strategies should be adopted to keep quality standards. The authors review and advocate the use of surgical recordings as a useful complement to current training, assessment, and revalidation modalities. For trainees, such recordings would promote quality-based and competence-based surgical training and allow for self-evaluation. Video logbooks could be used to aid interaction between trainer and trainee, and facilitate formative assessment. Recordings of surgery could also be integrated into trainees' portfolios and regular assessments. Finally, such recordings could make surgeons' revalidation more sensible. The routine use of records of surgical procedures could become an integral component of the standard of care. This would have been an unattractive suggestion until recently, as analogue recording techniques are inconvenient, cumbersome, and time consuming. Today, however, with the advent of inexpensive digital technologies, such a concept is realistic and is likely to improve patient care.

  13. Low-complexity camera digital signal imaging for video document projection system

    NASA Astrophysics Data System (ADS)

    Hsia, Shih-Chang; Tsai, Po-Shien

    2011-04-01

    We present high-performance and low-complexity algorithms for real-time camera imaging applications. The main functions of the proposed camera digital signal processing (DSP) involve color interpolation, white balance, adaptive binary processing, auto gain control, and edge and color enhancement for video projection systems. A series of simulations demonstrate that the proposed method can achieve good image quality while keeping computation cost and memory requirements low. On the basis of the proposed algorithms, the cost-effective hardware core is developed using Verilog HDL. The prototype chip has been verified with one low-cost programmable device. The real-time camera system can achieve 1270 × 792 resolution with the combination of extra components and can demonstrate each DSP function.

  14. Maynard places the Digital Video Disk on Cassini in the PHSF

    NASA Technical Reports Server (NTRS)

    1997-01-01

    In the Payload Hazardous Servicing Facility (PHSF), Dan Maynard, a Jet Propulsion Laboratory technician, inserts the Digital Video Disk (DVD) into a shallow cavity between two pieces of aluminum that will protect it from micrometeoroid impacts. The package will be mounted to the side of the two-story-tall spacecraft beneath a pallet carrying cameras and other space instruments that will be used to study the Saturnian system. A specially designed, multicolored patch of thermal blanket material will be installed over the disk package. Along with the spacecraft, the disk will reside in Saturn's orbit centuries after the primary mission is completed in July 2008. The Cassini mission is managed for NASA's Office of Space Science, Washington, D.C., by the Jet Propulsion Laboratory, a division of the California Institute of Technology.

  15. Automatic defect detection in video archives: application to Montreux Jazz Festival digital archives

    NASA Astrophysics Data System (ADS)

    Hanhart, Philippe; Rerabek, Martin; Ivanov, Ivan; Dufaux, Alain; Jones, Caryl; Delidais, Alexandre; Ebrahimi, Touradj

    2013-09-01

    Archival of audio-visual databases has become an important discipline in multimedia. Various defects are typ- ically present in such archives. Among those, one can mention recording related defects such as interference between audio and video signals, optical related artifacts, recording and play out artifacts such as horizontal lines, and dropouts, as well as those due to digitization such as diagonal lines. An automatic or semi-automatic detection to identify such defects is useful, especially for large databases. In this paper, we propose two auto- matic algorithms for detection of horizontal and diagonal lines, as well as dropouts that are among the most typical artifacts encountered. We then evaluate the performance of these algorithms by making use of ground truth scores obtained by human subjects.

  16. Talk about a YouTube Video in Preschool: The Mutual Production of Shared Understanding for Learning with Digital Technology

    ERIC Educational Resources Information Center

    Davidson, Christina; Given, Lisa M.; Danby, Susan; Thorpe, Karen

    2014-01-01

    Much of what is written about digital technologies in preschool contexts focuses on young children's acquisition of skills rather than their meaning-making during use of technologies. In this paper, we consider how the viewing of a YouTube video was used by a teacher and children to produce shared understandings about it. Conversation analysis of…

  17. Video Games and Learning: Teaching and Participatory Culture in the Digital Age. Technology, Education--Connections (the TEC Series)

    ERIC Educational Resources Information Center

    Squire, Kurt

    2011-01-01

    Can we learn socially and academically valuable concepts and skills from video games? How can we best teach the "gamer generation?" This accessible book describes how educators and curriculum designers can harness the participatory nature of digital media and play. The author presents a comprehensive model of games and learning that integrates…

  18. Talk about a YouTube Video in Preschool: The Mutual Production of Shared Understanding for Learning with Digital Technology

    ERIC Educational Resources Information Center

    Davidson, Christina; Given, Lisa M.; Danby, Susan; Thorpe, Karen

    2014-01-01

    Much of what is written about digital technologies in preschool contexts focuses on young children's acquisition of skills rather than their meaning-making during use of technologies. In this paper, we consider how the viewing of a YouTube video was used by a teacher and children to produce shared understandings about it. Conversation analysis of…

  19. Video Games and Learning: Teaching and Participatory Culture in the Digital Age. Technology, Education--Connections (the TEC Series)

    ERIC Educational Resources Information Center

    Squire, Kurt

    2011-01-01

    Can we learn socially and academically valuable concepts and skills from video games? How can we best teach the "gamer generation?" This accessible book describes how educators and curriculum designers can harness the participatory nature of digital media and play. The author presents a comprehensive model of games and learning that integrates…

  20. Motivating EFL Students: E-Learning Enjoyment as a Predictor of Vocabulary Learning through Digital Video Games

    ERIC Educational Resources Information Center

    Ebrahimzadeh, Mohsen; Alavi, Sepideh

    2016-01-01

    The present study examined e-learning enjoyment to see if it could predict high school students' vocabulary learning through a digital video game. Furthermore, the difference between those who played and those who watched the game was assessed. Participants of the study were male, high school, EFL students (N = 136, age 12-18) randomly assigned to…

  1. 78 FR 13139 - In the Matter of Digital Video Systems, Inc., Geocom Resources, Inc., and GoldMountain...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-26

    ... From the Federal Register Online via the Government Publishing Office ] SECURITIES AND EXCHANGE COMMISSION In the Matter of Digital Video Systems, Inc., Geocom Resources, Inc., and GoldMountain Exploration... accurate information concerning the securities of GoldMountain Exploration Corp. because it has not...

  2. The use of real-time digital video in the assessment of post-operative outcomes of breast reconstruction.

    PubMed

    Gilmour, A; Mackay, I R; Young, D; Hill, M E; Brown, L; Malyon, A D

    2014-10-01

    Outcome measures of breast reconstruction have used panel assessment of photographs. This provides limited information to the assessor as these images are static.. The aim of this study was to assess whether the use of digital video was a valid assessment tool and to compare its use against photography. 35 patients post-reconstruction underwent photography, digital video capture and completed Breast Cancer Treatment Outcomes Scale (BCTOS) questionnaires. The photographs/video clips were randomised and shown to a 21 member panel. Opinions on aesthetic aspects of the reconstruction were assessed using the BCTOS and Harris scale. Panel inter-rater agreement and patient-panel correlation was assessed using Kendall's Coefficient of Concordance and Spearman's rank correlation tests respectively. There was a "moderate" degree of inter-rater agreement amongst panel members in all categories. Greater agreement occurred using video footage to assess overall cosmesis (0.548 vs 0.507) and shape (0.505 vs 0.486). Video showed a greater degree of correlation with patient self-assessment scores in comparison to photography (0.311 vs 0.281). Video footage coupled with panel assessment is a valid method of assessing post-operative outcomes of breast reconstruction and appears superior to still photographs in terms of inter-rater agreement and correlation with patient self-assessment. Copyright © 2014 British Association of Plastic, Reconstructive and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.

  3. Synthetic streak images (x-t diagrams) from high-speed digital video records

    NASA Astrophysics Data System (ADS)

    Settles, Gary

    2013-11-01

    Modern digital video cameras have entirely replaced the older photographic drum and rotating-mirror cameras for recording high-speed physics phenomena. They are superior in almost every regard except, at speeds approaching one million frames/s, sensor segmentation results in severely reduced frame size, especially height. However, if the principal direction of subject motion is arranged to be along the frame length, a simple Matlab code can extract a row of pixels from each frame and stack them to produce a pseudo-streak image or x-t diagram. Such a 2-D image can convey the essence of the large volume of information contained in a high-speed video sequence, and can be the basis for the extraction of quantitative velocity data. Examples include streak shadowgrams of explosions and gunshots, streak schlieren images of supersonic cavity-flow oscillations, and direct streak images of shock-wave motion in polyurea samples struck by gas-gun projectiles, from which the shock Hugoniot curve of the polymer is measured. This approach is especially useful, since commercial streak cameras remain very expensive and rooted in 20th-century technology.

  4. Design of multi-view stereoscopic HD video transmission system based on MPEG-21 digital item adaptation

    NASA Astrophysics Data System (ADS)

    Lee, Seokhee; Lee, Kiyoung; Kim, Man Bae; Kim, JongWon

    2005-11-01

    In this paper, we propose a design of multi-view stereoscopic HD video transmission system based on MPEG-21 Digital Item Adaptation (DIA). It focuses on the compatibility and scalability to meet various user preferences and terminal capabilities. There exist a large variety of multi-view 3D HD video types according to the methods for acquisition, display, and processing. By following the MPEG-21 DIA framework, the multi-view stereoscopic HD video is adapted according to user feedback. A user can be served multi-view stereoscopic video which corresponds with his or her preferences and terminal capabilities. In our preliminary prototype, we verify that the proposed design can support two deferent types of display device (stereoscopic and auto-stereoscopic) and switching viewpoints between two available viewpoints.

  5. Enhancing Access to Audio and Video Collections of Raman Research Institute Library through Digitization

    NASA Astrophysics Data System (ADS)

    Nagaraj, M. N.; Benegal, V. J.; Bhandi, M. K.

    2015-04-01

    The library at the Raman Research (RRI) began digitization of its audio and video (AV) collections starting in the year 2000 with the intent to enhance the accessibility of these items. AV collections in their original format are problematic since they are vulnerable to physical damage and decay in uncontrolled climate conditions. Further, as AV formats have changed over the years, older formats become unreadable due to the fact that the equipment needed to view such materials is obsolete or no longer available. This paper will show how RRI has taken multiple measures to address these various problems. At first, catalogue records were enhanced with additional metadata, but this did not sufficiently enhance access. Next, the library converted the AV materials to CDs, but this format also posed various problems, as CDs are susceptible to damage and do not allow for multiple simultaneous use. Finally, the RRI library digitized AV materials and placed them on the RRI intranet and the web for wider accessibility.

  6. Acoustic emissions of digital data video projectors- Investigating noise sources and their change during product aging

    NASA Astrophysics Data System (ADS)

    White, Michael Shane

    2005-09-01

    Acoustic emission testing continues to be a growing part of IT and telecommunication product design, as product noise is increasingly becoming a differentiator in the marketplace. This is especially true for digital/video display companies, such as InFocus Corporation, considering the market shift of these products to the home entertainment consumer as retail prices drop and performance factors increase. Projectors and displays using Digital Light Processing(tm) [DLP(tm)] technology incorporate a device known as a ColorWheel(tm) to generate the colors displayed at each pixel in the image. These ColorWheel(tm) devices spin at very high speeds and can generate high-frequency tones not typically heard in liquid crystal displays and other display technologies. Also, acoustic emission testing typically occurs at the beginning of product life and is a measure of acoustic energy emitted at this point in the lifecycle. Since the product is designed to be used over a long period of time, there is concern as to whether the acoustic emissions change over the lifecycle of the product, whether these changes will result in a level of nuisance to the average customer, and does this nuisance begin to develop prior to the intended lifetime of the product.

  7. Digital Terrestrial Video Broadcast Interference Suppression in Forward-Looking Ground Penetrating Radar Systems

    NASA Astrophysics Data System (ADS)

    Rial, F. I.; Mendez-Rial, Roi; Lawadka, Lukasz; Gonzalez-Huici, Maria A.

    2014-11-01

    In this paper we show how radio frequency interference (RFI) generated by digital video broadcasting terrestrial and digital audio broadcasting transmitters can be an important noise source for forward-looking ground penetrating radar (FLGPR) systems. Even in remote locations the average interference power sometimes exceeds ultra-wideband signals by many dB, becoming the limiting factor in the system sensitivity. The overall problem of RFI and its impact in GPR systems is briefly described and several signal processing approaches to removal of RFI are discussed. These include spectral estimation and coherent subtraction algorithms and various filter approaches which have been developed and applied by the research community in similar contexts. We evaluate the performance of these methods by simulating two different scenarios submitted to real RFI acquired with a FLGPR system developed at the Fraunhofer Institute for High Frequency Physics and Radar Techniques (FHR), (GER). The effectiveness of these algorithms in removing RFI is presented using some performance indices after suppression.

  8. Multispectral scanner optical system

    NASA Technical Reports Server (NTRS)

    Stokes, R. C.; Koch, N. G. (Inventor)

    1980-01-01

    An optical system for use in a multispectral scanner of the type used in video imaging devices is disclosed. Electromagnetic radiation reflected by a rotating scan mirror is focused by a concave primary telescope mirror and collimated by a second concave mirror. The collimated beam is split by a dichroic filter which transmits radiant energy in the infrared spectrum and reflects visible and near infrared energy. The long wavelength beam is filtered and focused on an infrared detector positioned in a cryogenic environment. The short wavelength beam is dispersed by a pair of prisms, then projected on an array of detectors also mounted in a cryogenic environment and oriented at an angle relative to the optical path of the dispersed short wavelength beam.

  9. Multispectral imaging of absorption and scattering properties of in vivo exposed rat brain using a digital red-green-blue camera

    NASA Astrophysics Data System (ADS)

    Yoshida, Keiichiro; Nishidate, Izumi; Ishizuka, Tomohiro; Kawauchi, Satoko; Sato, Shunichi; Sato, Manabu

    2015-05-01

    In order to estimate multispectral images of the absorption and scattering properties in the cerebral cortex of in vivo rat brain, we investigated spectral reflectance images estimated by the Wiener estimation method using a digital RGB camera. A Monte Carlo simulation-based multiple regression analysis for the corresponding spectral absorbance images at nine wavelengths (500, 520, 540, 560, 570, 580, 600, 730, and 760 nm) was then used to specify the absorption and scattering parameters of brain tissue. In this analysis, the concentrations of oxygenated hemoglobin and that of deoxygenated hemoglobin were estimated as the absorption parameters, whereas the coefficient a and the exponent b of the reduced scattering coefficient spectrum approximated by a power law function were estimated as the scattering parameters. The spectra of absorption and reduced scattering coefficients were reconstructed from the absorption and scattering parameters, and the spectral images of absorption and reduced scattering coefficients were then estimated. In order to confirm the feasibility of this method, we performed in vivo experiments on exposed rat brain. The estimated images of the absorption coefficients were dominated by the spectral characteristics of hemoglobin. The estimated spectral images of the reduced scattering coefficients had a broad scattering spectrum, exhibiting a larger magnitude at shorter wavelengths, corresponding to the typical spectrum of brain tissue published in the literature. The changes in the estimated absorption and scattering parameters during normoxia, hyperoxia, and anoxia indicate the potential applicability of the method by which to evaluate the pathophysiological conditions of in vivo brain due to the loss of tissue viability.

  10. Multispectral imaging of absorption and scattering properties of in vivo exposed rat brain using a digital red-green-blue camera.

    PubMed

    Yoshida, Keiichiro; Nishidate, Izumi; Ishizuka, Tomohiro; Kawauchi, Satoko; Sato, Shunichi; Sato, Manabu

    2015-05-01

    In order to estimate multispectral images of the absorption and scattering properties in the cerebral cortex of in vivo rat brain, we investigated spectral reflectance images estimated by the Wiener estimation method using a digital RGB camera. A Monte Carlo simulation-based multiple regression analysis for the corresponding spectral absorbance images at nine wavelengths (500, 520, 540, 560, 570, 580, 600, 730, and 760 nm) was then used to specify the absorption and scattering parameters of brain tissue. In this analysis, the concentrations of oxygenated hemoglobin and that of deoxygenated hemoglobin were estimated as the absorption parameters, whereas the coefficient a and the exponent b of the reduced scattering coefficient spectrum approximated by a power law function were estimated as the scattering parameters. The spectra of absorption and reduced scattering coefficients were reconstructed from the absorption and scattering parameters, and the spectral images of absorption and reduced scattering coefficients were then estimated. In order to confirm the feasibility of this method, we performed in vivo experiments on exposed rat brain. The estimated images of the absorption coefficients were dominated by the spectral characteristics of hemoglobin. The estimated spectral images of the reduced scattering coefficients had a broad scattering spectrum, exhibiting a larger magnitude at shorter wavelengths, corresponding to the typical spectrum of brain tissue published in the literature. The changes in the estimated absorption and scattering parameters during normoxia, hyperoxia, and anoxia indicate the potential applicability of the method by which to evaluate the pathophysiological conditions of in vivo brain due to the loss of tissue viability.

  11. A compact high-definition low-cost digital stereoscopic video camera for rapid robotic surgery development.

    PubMed

    Carlson, Jay; Kowalczuk, Jędrzej; Psota, Eric; Pérez, Lance C

    2012-01-01

    Robotic surgical platforms require vision feedback systems, which often consist of low-resolution, expensive, single-imager analog cameras. These systems are retooled for 3D display by simply doubling the cameras and outboard control units. Here, a fully-integrated digital stereoscopic video camera employing high-definition sensors and a class-compliant USB video interface is presented. This system can be used with low-cost PC hardware and consumer-level 3D displays for tele-medical surgical applications including military medical support, disaster relief, and space exploration.

  12. Low-power, real-time digital video stabilization using the HyperX parallel processor

    NASA Astrophysics Data System (ADS)

    Hunt, Martin A.; Tong, Lin; Bindloss, Keith; Zhong, Shang; Lim, Steve; Schmid, Benjamin J.; Tidwell, J. D.; Willson, Paul D.

    2011-06-01

    Coherent Logix has implemented a digital video stabilization algorithm for use in soldier systems and small unmanned air / ground vehicles that focuses on significantly reducing the size, weight, and power as compared to current implementations. The stabilization application was implemented on the HyperX architecture using a dataflow programming methodology and the ANSI C programming language. The initial implementation is capable of stabilizing an 800 x 600, 30 fps, full color video stream with a 53ms frame latency using a single 100 DSP core HyperX hx3100TM processor running at less than 3 W power draw. By comparison an Intel Core2 Duo processor running the same base algorithm on a 320x240, 15 fps stream consumes on the order of 18W. The HyperX implementation is an overall 100x improvement in performance (processing bandwidth increase times power improvement) over the GPP based platform. In addition the implementation only requires a minimal number of components to interface directly to the imaging sensor and helmet mounted display or the same computing architecture can be used to generate software defined radio waveforms for communications links. In this application, the global motion due to the camera is measured using a feature based algorithm (11 x 11 Difference of Gaussian filter and Features from Accelerated Segment Test) and model fitting (Random Sample Consensus). Features are matched in consecutive frames and a control system determines the affine transform to apply to the captured frame that will remove or dampen the camera / platform motion on a frame-by-frame basis.

  13. Validation of a digital video tracking system for recording pig locomotor behaviour.

    PubMed

    Lind, Nanna M; Vinther, Michael; Hemmingsen, Ralf P; Hansen, Axel K

    2005-04-30

    We are introducing a system for automatically tracking pig locomotor behaviour. Transposing methods for the video-based tracking of rodent behaviour engenders several problems. We have therefore improved existing methods, based on image-subtraction, to offer increased flexibility and accuracy in tracking large-sized animals in situations with a constantly changing background. The improved tracking algorithms introduce a reference frame, which does not include the animal and is automatically updated, and implementation of an automatic threshold detection algorithm. This makes the system more robust to the tracking environment, which could even be of the same colour as the animal, and allows the tracking environment to change during recording. We validated the system by estimating the repeatability, accuracy, and basic noise level, and tested the system in different levels of animal activity evoked by administration of apomorphine (APO) to minipigs in an open field test. Seven pigs each received the vehicle and three doses of APO (0.05, 0.1, and 0.3 mg/kg i.m.), and the locomotor behaviour of each session was recorded for 60-min. The calculated coefficient of repeatability was 0.6%, indicating high repeatability and the basic noise level of the tracking system was estimated to be 2%. Administration of the two lowest doses of APO was accompanied by increased locomotor activity of the pigs. Thus, this digital video-based tracking system for automatically tracking the spontaneous locomotor behaviour of pigs is highly reliable and accurate, and was able to detect well-known effects of APO in pig locomotor activity.

  14. Aerospace video imaging systems for rangeland management

    NASA Technical Reports Server (NTRS)

    Everitt, J. H.; Escobar, D. E.; Richardson, A. J.; Lulla, K.

    1990-01-01

    This paper presents an overview on the application of airborne video imagery (VI) for assessment of rangeland resources. Multispectral black-and-white video with visible/NIR sensitivity; color-IR, normal color, and black-and-white MIR; and thermal IR video have been used to detect or distinguish among many rangeland and other natural resource variables such as heavy grazing, drought-stressed grass, phytomass levels, burned areas, soil salinity, plant communities and species, and gopher and ant mounds. The digitization and computer processing of VI have also been demonstrated. VI does not have the detailed resolution of film, but these results have shown that it has considerable potential as an applied remote sensing tool for rangeland management. In the future, spaceborne VI may provide additional data for monitoring and management of rangelands.

  15. Aerospace video imaging systems for rangeland management

    NASA Technical Reports Server (NTRS)

    Everitt, J. H.; Escobar, D. E.; Richardson, A. J.; Lulla, K.

    1990-01-01

    This paper presents an overview on the application of airborne video imagery (VI) for assessment of rangeland resources. Multispectral black-and-white video with visible/NIR sensitivity; color-IR, normal color, and black-and-white MIR; and thermal IR video have been used to detect or distinguish among many rangeland and other natural resource variables such as heavy grazing, drought-stressed grass, phytomass levels, burned areas, soil salinity, plant communities and species, and gopher and ant mounds. The digitization and computer processing of VI have also been demonstrated. VI does not have the detailed resolution of film, but these results have shown that it has considerable potential as an applied remote sensing tool for rangeland management. In the future, spaceborne VI may provide additional data for monitoring and management of rangelands.

  16. Digital Video Broadcast-Terrestrial (DVB-T) Single Frequency Networks Positioning in Dynamic Scenarios

    PubMed Central

    Huang, Jie; Lo Presti, Letizia; Garello, Roberto

    2013-01-01

    Since Global Navigation Satellite Systems (GNSS) show degraded performance in dense urban and indoor areas, a positioning sensor based on Digital Video Broadcast-Terrestrial (DVB-T) systems is presented in this paper. DVB-T signals can be considered as signals-of-opportunity for positioning, due to their good properties. One of the challenges to overcome is to distinguish the signals from different emitters. Here, we suppose that the user can first compute his position by GNSS during an initialization phase, which is used for solving all the ambiguities concerning DVB-T emitters. Starting from there, DVB-T signals can be used for aiding positioning when the user enters a GNSS-blocked area, up to a limit case, where all the GNSS satellites are not in view and only DVB-T signals are used for positioning. We tested this method by simulation, by adopting the Hata model for the emitter attenuations and the Rayleigh model for multipath. The obtained results show good performance if the receiver correctly associates the signal to the user's motion. PMID:23939581

  17. Digital Video Broadcast-Terrestrial (DVB-T) single frequency networks positioning in dynamic scenarios.

    PubMed

    Huang, Jie; Lo Presti, Letizia; Garello, Roberto

    2013-08-09

    Since Global Navigation Satellite Systems (GNSS) show degraded performance in dense urban and indoor areas, a positioning sensor based on Digital Video Broadcast-Terrestrial (DVB-T) systems is presented in this paper. DVB-T signals can be considered as signals-of-opportunity for positioning, due to their good properties. One of the challenges to overcome is to distinguish the signals from different emitters. Here, we suppose that the user can first compute his position by GNSS during an initialization phase, which is used for solving all the ambiguities concerning DVB-T emitters. Starting from there, DVB-T signals can be used for aiding positioning when the user enters a GNSS-blocked area, up to a limit case, where all the GNSS satellites are not in view and only DVB-T signals are used for positioning. We tested this method by simulation, by adopting the Hata model for the emitter attenuations and the Rayleigh model for multipath. The obtained results show good performance if the receiver correctly associates the signal to the user's motion.

  18. Live vs. digital video disk exercise in college--aged females.

    PubMed

    Killen, Lauren G; Barry, Vaughn W; Cooper, Cathy; Coons, John M

    2014-12-01

    Although exercise digital video disk (DVD) sales have substantially increased over the past decade, little is known on the effectiveness of personal training vs. DVD exercises. The purpose of this study was to compare energy expenditures and heart rates of live and DVD vigorously intense exercise sessions. Twenty active and low-to-moderate fit, college-aged females completed 2 identical exercise sessions. Each exercise session consisted of 6 exercises; 1 session was completed with a personal trainer and the other with a DVD. A portable metabolic analyzer was used to measure oxygen consumption and record heart rate. Both energy expenditure (p < 0.001) and heart rate (p = 0.001) were significantly higher during the live exercise session as compared with the DVD exercise session. Rate of perceived exertion was significantly higher for the live exercise session compared with the DVD exercise session (p = 0.045). Finally, the majority (89%) of the participants reported that they preferred the live exercise session over the DVD exercise session. The results suggest that low-to-moderately fit college-aged females not only prefer exercise sessions with a personal trainer but will also demonstrate higher energy expenditures and heart rates.

  19. Local characterization of hindered Brownian motion by using digital video microscopy and 3D particle tracking.

    PubMed

    Dettmer, Simon L; Keyser, Ulrich F; Pagliara, Stefano

    2014-02-01

    In this article we present methods for measuring hindered Brownian motion in the confinement of complex 3D geometries using digital video microscopy. Here we discuss essential features of automated 3D particle tracking as well as diffusion data analysis. By introducing local mean squared displacement-vs-time curves, we are able to simultaneously measure the spatial dependence of diffusion coefficients, tracking accuracies and drift velocities. Such local measurements allow a more detailed and appropriate description of strongly heterogeneous systems as opposed to global measurements. Finite size effects of the tracking region on measuring mean squared displacements are also discussed. The use of these methods was crucial for the measurement of the diffusive behavior of spherical polystyrene particles (505 nm diameter) in a microfluidic chip. The particles explored an array of parallel channels with different cross sections as well as the bulk reservoirs. For this experiment we present the measurement of local tracking accuracies in all three axial directions as well as the diffusivity parallel to the channel axis while we observed no significant flow but purely Brownian motion. Finally, the presented algorithm is suitable also for tracking of fluorescently labeled particles and particles driven by an external force, e.g., electrokinetic or dielectrophoretic forces.

  20. Local characterization of hindered Brownian motion by using digital video microscopy and 3D particle tracking

    SciTech Connect

    Dettmer, Simon L.; Keyser, Ulrich F.; Pagliara, Stefano

    2014-02-15

    In this article we present methods for measuring hindered Brownian motion in the confinement of complex 3D geometries using digital video microscopy. Here we discuss essential features of automated 3D particle tracking as well as diffusion data analysis. By introducing local mean squared displacement-vs-time curves, we are able to simultaneously measure the spatial dependence of diffusion coefficients, tracking accuracies and drift velocities. Such local measurements allow a more detailed and appropriate description of strongly heterogeneous systems as opposed to global measurements. Finite size effects of the tracking region on measuring mean squared displacements are also discussed. The use of these methods was crucial for the measurement of the diffusive behavior of spherical polystyrene particles (505 nm diameter) in a microfluidic chip. The particles explored an array of parallel channels with different cross sections as well as the bulk reservoirs. For this experiment we present the measurement of local tracking accuracies in all three axial directions as well as the diffusivity parallel to the channel axis while we observed no significant flow but purely Brownian motion. Finally, the presented algorithm is suitable also for tracking of fluorescently labeled particles and particles driven by an external force, e.g., electrokinetic or dielectrophoretic forces.

  1. Creating Micro-Videos to Demonstrate Technology Learning and Digital Literacy

    ERIC Educational Resources Information Center

    Frydenberg, Mark; Andone, Diana

    2016-01-01

    Purpose: Short videos, also known as micro-videos, have emerged as a platform for sharing ideas, experiences and life events via online social networks. This paper aims to share preliminary results of a study, involving students from two universities who created six-second videos using the Vine mobile app to explain or illustrate technological…

  2. Creating Micro-Videos to Demonstrate Technology Learning and Digital Literacy

    ERIC Educational Resources Information Center

    Frydenberg, Mark; Andone, Diana

    2016-01-01

    Purpose: Short videos, also known as micro-videos, have emerged as a platform for sharing ideas, experiences and life events via online social networks. This paper aims to share preliminary results of a study, involving students from two universities who created six-second videos using the Vine mobile app to explain or illustrate technological…

  3. The Role of Signifier Differences, Associations, and Combinations in Creative Digital Video Composing: Making Meaning with Gestures, Objects, Actions, and Speech

    ERIC Educational Resources Information Center

    Ranker, Jason

    2017-01-01

    This article presents an analysis of a digital video created by a student (age 13) in a classroom setting. Since sign functioning is a key focus in theories of meaning making as it occurs through language and through other modes, my analysis focuses on the relations between signifiers as they are inscribed in her video. This analysis explores new…

  4. Does Digital Video Advertising Increase Population-Level Reach of Multimedia Campaigns? Evidence From the 2013 Tips From Former Smokers Campaign

    PubMed Central

    Shafer, Paul R; Rodes, Robert; Kim, Annice; Hansen, Heather; Patel, Deesha; Coln, Caryn; Beistle, Diane

    2016-01-01

    Background Federal and state public health agencies in the United States are increasingly using digital advertising and social media to promote messages from broader multimedia campaigns. However, little evidence exists on population-level campaign awareness and relative cost efficiencies of digital advertising in the context of a comprehensive public health education campaign. Objective Our objective was to compare the impact of increased doses of digital video and television advertising from the 2013 Tips From Former Smokers (Tips) campaign on overall campaign awareness at the population level. We also compared the relative cost efficiencies across these media platforms. Methods We used data from a large national online survey of approximately 15,000 US smokers conducted in 2013 immediately after the conclusion of the 2013 Tips campaign. These data were used to compare the effects of variation in media dose of digital video and television advertising on population-level awareness of the Tips campaign. We implemented higher doses of digital video among selected media markets and randomly selected other markets to receive similar higher doses of television ads. Multivariate logistic regressions estimated the odds of overall campaign awareness via digital or television format as a function of higher-dose media in each market area. All statistical tests used the .05 threshold for statistical significance and the .10 level for marginal nonsignificance. We used adjusted advertising costs for the additional doses of digital and television advertising to compare the cost efficiencies of digital and television advertising on the basis of costs per percentage point of population awareness generated. Results Higher-dose digital video advertising was associated with 94% increased odds of awareness of any ad online relative to standard-dose markets (P<.001). Higher-dose digital advertising was associated with a marginally nonsignificant increase (46%) in overall campaign

  5. Does Digital Video Advertising Increase Population-Level Reach of Multimedia Campaigns? Evidence From the 2013 Tips From Former Smokers Campaign.

    PubMed

    Davis, Kevin C; Shafer, Paul R; Rodes, Robert; Kim, Annice; Hansen, Heather; Patel, Deesha; Coln, Caryn; Beistle, Diane

    2016-09-14

    Federal and state public health agencies in the United States are increasingly using digital advertising and social media to promote messages from broader multimedia campaigns. However, little evidence exists on population-level campaign awareness and relative cost efficiencies of digital advertising in the context of a comprehensive public health education campaign. Our objective was to compare the impact of increased doses of digital video and television advertising from the 2013 Tips From Former Smokers (Tips) campaign on overall campaign awareness at the population level. We also compared the relative cost efficiencies across these media platforms. We used data from a large national online survey of approximately 15,000 US smokers conducted in 2013 immediately after the conclusion of the 2013 Tips campaign. These data were used to compare the effects of variation in media dose of digital video and television advertising on population-level awareness of the Tips campaign. We implemented higher doses of digital video among selected media markets and randomly selected other markets to receive similar higher doses of television ads. Multivariate logistic regressions estimated the odds of overall campaign awareness via digital or television format as a function of higher-dose media in each market area. All statistical tests used the .05 threshold for statistical significance and the .10 level for marginal nonsignificance. We used adjusted advertising costs for the additional doses of digital and television advertising to compare the cost efficiencies of digital and television advertising on the basis of costs per percentage point of population awareness generated. Higher-dose digital video advertising was associated with 94% increased odds of awareness of any ad online relative to standard-dose markets (P<.001). Higher-dose digital advertising was associated with a marginally nonsignificant increase (46%) in overall campaign awareness regardless of media format (P

  6. Impact of Guidance Provided by a Multispectral Digital Skin Lesion Analysis Device Following Dermoscopy on Decisions to Biopsy Atypical Melanocytic Lesions.

    PubMed

    Winkelmann, Richard R; Yoo, Jane; Tucker, Natalie; White, Richard; Rigel, Darrell S

    2015-09-01

    To determine how a multispectral digital skin lesion analysis (MSDSLA) device data affects the biopsy performance of dermatologists and non-dermatologist practitioners following clinical and dermoscopic pigmented lesion evaluation. MSDSLA employs near infrared light to image and analyze pigmented skin lesions. MSDSLA generates a "classifier score" based on morphological disorganization. Using a logistical regression model, 1) a probability of being melanoma and, 2) a probability of being melanoma, atypical melanocytic hyperplasia, or a high grade dysplastic nevus is computed. PARTICIPANTS were shown clinical images of 12 lesions (2 melanomas in situ, 3 invasive melanomas, and 7 low grade DNs). They were asked first if they would biopsy the lesion based on clinical images, again after observing dermoscopy images, and once more when presented with MSDSLA probability information. National dermoscopy conference. Sixty-four healthcare providers; 30 dermatologists and 34 non-dermatologist practitioners. Sensitivity, specificity, diagnostic accuracy, biopsy rates Results: For the 30 dermatologists, sensitivity was 65 percent after clinical evaluation (C) and 65% post-dermoscopy (D) but improved to 91% after MSDSLA. For the 34 non-dermatologist practitioners, sensitivity improved from 66 percent (C) to 70 percent (D) to 95 percent after MSDSLA. With MSDSLA information, dermatologist specificity increased from 40 percent (D) to 58 percent while non-dermatologist practitioners specificity increased from 34 percent (D) to 55 percent. Diagnostic accuracy of malignant and benign lesions decreased for both groups 55 percent (C) to 51 percent (D) for dermatologists and 54 percent (C) to 49 percent (D) for non-dermatologist practitioners. However, diagnostic accuracy increased to 72 percent for dermatologists and 72 percent for non-dermatologist practitioners with MSDSLA data. Non-melanoma biopsy percentages by dermatologists increased from 53 percent (C) to 60 percent (D), but

  7. Multispectral data compression through transform coding and block quantization

    NASA Technical Reports Server (NTRS)

    Ready, P. J.; Wintz, P. A.

    1972-01-01

    Transform coding and block quantization techniques are applied to multispectral aircraft scanner data, and digitized satellite imagery. The multispectral source is defined and an appropriate mathematical model proposed. The Karhunen-Loeve, Fourier, and Hadamard encoders are considered and are compared to the rate distortion function for the equivalent Gaussian source and to the performance of the single sample PCM encoder.

  8. The Eye Catching Property of Digital-Signage with Scent and a Scent-Emitting Video Display System

    NASA Astrophysics Data System (ADS)

    Tomono, Akira; Otake, Syunya

    In this paper, the effective method of inducing a glance aimed at the digital signage by emitting a scent is described. The simulation experiment was done using the immersive VR System because there were a lot of restrictions to the experiment in an actual passageway. In order to investigate the eye catching property of the digital signage, the passer-by's eye movement was analyzed. Through the experiment, they were clarified that the digital signage with the scent was paid to attention, and the strong impression remained in the memory. Next, a scent-emitting video display system applying to the digital signage is described. To this end, a scent-emitting device that is able to quickly change the scents it is releasing, and present them from a distance (by the non-contact method), thus maintaining a relationship between the scent and the image, must be developed. We propose a new method where a device that can release pressurized gases is placed behind the display screen filled with tiny pores. Scents are then ejected from this device, traveling through the pores to the front side of the screen. An excellent scent delivery characteristic was obtained because the distance to the user is close and the scent is presented from the front. We also present a method for inducing viewer reactions using on-screen images, thereby enabling scent release to coincide precisely with viewer inhalations. We anticipate that the simultaneous presentation of scents and video images will deepen viewers' comprehension of these images.

  9. Habitat diversity in the Northeastern Gulf of Mexico: Selected video clips from the Gulfstream Natural Gas Pipeline digital archive

    USGS Publications Warehouse

    Raabe, Ellen A.; D'Anjou, Robert; Pope, Domonique K.; Robbins, Lisa L.

    2011-01-01

    This project combines underwater video with maps and descriptions to illustrate diverse seafloor habitats from Tampa Bay, Florida, to Mobile Bay, Alabama. A swath of seafloor was surveyed with underwater video to 100 meters (m) water depth in 1999 and 2000 as part of the Gulfstream Natural Gas System Survey. The U.S. Geological Survey (USGS) in St. Petersburg, Florida, in cooperation with Eckerd College and the Florida Department of Environmental Protection (FDEP), produced an archive of analog-to-digital underwater movies. Representative clips of seafloor habitats were selected from hundreds of hours of underwater footage. The locations of video clips were mapped to show the distribution of habitat and habitat transitions. The numerous benthic habitats in the northeastern Gulf of Mexico play a vital role in the region's economy, providing essential resources for tourism, natural gas, recreational water sports (fishing, boating, scuba diving), materials, fresh food, energy, a source of sand for beach renourishment, and more. These submerged natural resources are important to the economy but are often invisible to the general public. This product provides a glimpse of the seafloor with sample underwater video, maps, and habitat descriptions. It was developed to depict the range and location of seafloor habitats in the region but is limited by depth and by the survey track. It should not be viewed as comprehensive, but rather as a point of departure for inquiries and appreciation of marine resources and seafloor habitats. Further information is provided in the Resources section.

  10. The Observer Video-Pro: new software for the collection, management, and presentation of time-structured data from videotapes and digital media files.

    PubMed

    Noldus, L P; Trienes, R J; Hendriksen, A H; Jansen, H; Jansen, R G

    2000-02-01

    The Observer Video-Pro is a system for collecting, managing, analyzing, and presenting observational data. It integrates The Observer software with time code and multimedia hardware components. It extends the functionality of a conventional real-time event recording program in various ways. Observational data can be collected, reviewed, and edited with synchronized display of the corresponding video images. For optimal visual feedback during coding, one can display the video image in a window on the computer screen. Video playback from either a VCR or a digital media file can be controlled by the computer, allowing software-controlled jog, shuttle, and search functions. Besides a wide range of VCRs, The Observer Video-Pro supports all major digital video file formats. The software allows the user to summarize research findings in numerical, graphical, or multimedia format. One can create a time--event plot for a quick glance at the temporal structure of the observed process, or run specific analysis procedures and generate reports with statistics. An Event Summary function is available for exploratory and qualitative analysis. Video material can be summarized in a Video Play List, which allows on-screen summary presentations or the creation of highlight compilations on tape, CD, or other media. Video images can be captured and saved as disk files, for use as illustrations in documents, slides for presentations, and so forth. In this paper we describe the design and operation of the system, illustrated with a case study from research on Repetitive Strain Injury (RSI).

  11. Exploring Novice Teachers' Cognitive Processes Using Digital Video Technology: A Qualitative Case Study

    ERIC Educational Resources Information Center

    Sun-Ongerth, Yuelu

    2012-01-01

    This dissertation describes a qualitative case study that investigated novice teachers' video-aided reflection on their own teaching. To date, most studies that have investigated novice teachers' video-aided reflective practice have focused on examining novice teachers' levels of reflective writing rather than the cognitive…

  12. Exploring Novice Teachers' Cognitive Processes Using Digital Video Technology: A Qualitative Case Study

    ERIC Educational Resources Information Center

    Sun-Ongerth, Yuelu

    2012-01-01

    This dissertation describes a qualitative case study that investigated novice teachers' video-aided reflection on their own teaching. To date, most studies that have investigated novice teachers' video-aided reflective practice have focused on examining novice teachers' levels of reflective writing rather than the cognitive…

  13. Speed: "Run"-Time Compressed Video for Learning Improvement and Digital Time Compression Economy.

    ERIC Educational Resources Information Center

    Gutenko, Gregory

    This paper discusses the benefits that may be realized through "running" time compression (RTC) of video material. RTC is the playback of audio/video at a temporal frame rate faster (with audio pitch correction) than that used when recorded. Previous research has shown that RTC can enhance learning and the retention of content; RTC in…

  14. Evaluation of compressed digital high-definition video transmitted through the NASA communications system

    NASA Astrophysics Data System (ADS)

    Beakley, Guy W.; Kohn, Elliott S.

    1993-01-01

    A series of experiments was conducted over the past three years to prepare NASA for the use of high-definition television. In 1989 and in 1990, HDTV technology was evaluated for potential use in launch operations, real-time image analysis, and media dissemination at the Kennedy Space Center (KSC). Evaluation of camera and lens performance is reported here. In November 1991, an experiment was done at the Johnson Space Center (JSC) to evaluate the quality of HDTV that was digitized, compressed to a 45 Mbps data stream, and transmitted through the NASA communications network. The JSC experiment consisted of back-to-back bench tests of the Alcatel/Telettra high-definition coder/decoder (codec), followed by data transmission through the NASA Shuttle communications simulator, and most importantly, actual transmission through the NASA Tracking and Data Relay Satellite System (TDRSS), with a second satellite hop through a domestic satellite and a fiber-optic link at JSC. Static and dynamic test signals were used to test codec performance as were various types of subjective- test scenes with detail and motion. Included in the subjective material was IMAX film shot in space and transferred directly to high-definition video at 30 frames/second. Static tests highlighted the effects of the 54 MHz sampling rate in the codec. Color reproduction tests showed very little color error, even when transcoding externally from GBR signals. Dynamic test signals characterized the DCT and motion-compensation algorithm. Frame-by-frame analysis showed a small reduction in horizontal resolution, small color errors in fine detail, and reduced horizontal and vertical resolution immediately following transitions, where the effect was almost entirely masked by the transitions. Subjective codec performance on moving images at nominal TDRSS bit-error-rates (BER) was extremely good. The codec designers have done a very good job of leaving out information that is not perceived while including almost

  15. Data processing large quantities of multispectral information

    NASA Technical Reports Server (NTRS)

    Haskell, R. E.

    1975-01-01

    Method is combination of digital and optical techniques. Multispectral data is coded into binary matrix format and then encoded onto photographic film. Film is holographically correlated with spectral signature to generate single-class classification map. Number of maps are optically superimposed to produce full-color, multiclass classification map.

  16. Multispectral microwave imaging radar for remote sensing applications

    NASA Technical Reports Server (NTRS)

    Larson, R. W.; Rawson, R.; Ausherman, D.; Bryan, L.; Porcello, L.

    1974-01-01

    A multispectral airborne microwave radar imaging system, capable of obtaining four images simultaneously is described. The system has been successfully demonstrated in several experiments and one example of results obtained, fresh water ice, is given. Consideration of the digitization of the imagery is given and an image digitizing system described briefly. Preliminary results of digitization experiments are included.

  17. Video image-based analysis of single human induced pluripotent stem cell derived cardiomyocyte beating dynamics using digital image correlation

    PubMed Central

    2014-01-01

    Background The functionality of a cardiomyocyte is primarily measured by analyzing the electrophysiological properties of the cell. The analysis of the beating behavior of single cardiomyocytes, especially ones derived from stem cells, is challenging but well warranted. In this study, a video-based method that is non-invasive and label-free is introduced and applied for the study of single human cardiomyocytes derived from induced pluripotent stem cells. Methods The beating of dissociated stem cell-derived cardiomyocytes was visualized with a microscope and the motion was video-recorded. Minimum quadratic difference, a digital image correlation method, was used for beating analysis with geometrical sectorial cell division and radial/tangential directions. The time series of the temporal displacement vector fields of a single cardiomyocyte was computed from video data. The vector field data was processed to obtain cell-specific, contraction-relaxation dynamics signals. Simulated cardiomyocyte beating was used as a reference and the current clamp of real cardiomyocytes was used to analyze the electrical functionality of the beating cardiomyocytes. Results Our results demonstrate that our sectorized image correlation method is capable of extracting single cell beating characteristics from the video data of induced pluripotent stem cell-derived cardiomyocytes that have no clear movement axis, and that the method can accurately identify beating phases and time parameters. Conclusion Our video analysis of the beating motion of single human cardiomyocytes provides a robust, non-invasive and label-free method to analyze the mechanobiological functionality of cardiomyocytes derived from induced pluripotent stem cells. Thus, our method has potential for the high-throughput analysis of cardiomyocyte functions. PMID:24708714

  18. Phase error correction based on Inverse Function Shift Estimation in Phase Shifting Profilometry using a digital video projector

    NASA Astrophysics Data System (ADS)

    Liu, Yang; Xi, Jiangtao; Yu, Yanguang; Chicharo, Joe

    2010-11-01

    Fringe Pattern Profilometry (FPP) is 3D surface measuring technique based on triangulation. The utilization of digital projection in FPP system introduces significant phase distortion for Phase Shifting Profilometry (PSP), because of the nonlinear response of digital video projectors, which is referred as gamma distortion. Considering that the distorted phase has a stable function for a reference plane, this paper proposes an approach based on inverse function shift estimation (IFSE) to detect the spatial shift of the distorted phase caused by object height. This spatial shift is independent of projector's gamma distortion and accurate surface can be reconstructed based it. The simulation results show that the proposed method can almost completely eliminate gamma distortion in reconstructed surface and we obtain more than 5 times improvement in practical experiments.

  19. Digital video image processing from dental operating microscope in endodontic treatment.

    PubMed

    Suehara, Masataka; Nakagawa, Kan-Ichi; Aida, Natsuko; Ushikubo, Toshihiro; Morinaga, Kazuki

    2012-01-01

    Recently, optical microscopes have been used in endodontic treatment, as they offer advantages in terms of magnification, illumination, and documentation. Documentation is particularly important in presenting images to patients, and can take the form of both still images and motion video. Although high-quality still images can be obtained using a 35-mm film or CCD camera, the quality of still images produced by a video camera is significantly lower. The purpose of this study was to determine the potential of RegiStax in obtaining high-quality still images from a continuous video stream from an optical microscope. Video was captured continuously and sections with the highest luminosity chosen for frame alignment and stacking using the RegiStax program. The resulting stacked images were subjected to wavelet transformation. The results indicate that high-quality images with a large depth of field could be obtained using this method.

  20. Using Digital Video Editing to Shape Novice Teachers: A Generative Process for Nurturing Professional Growth

    ERIC Educational Resources Information Center

    Calandra, Brendan; Brantley-Dias, Laurie

    2010-01-01

    The authors describe the generative process for using video editing for teachers' professional development. The article provides a rationale, a theoretical framework, and a critical review of the authors' work over the past five years.

  1. Interactive color display for multispectral imagery using correlation clustering

    NASA Technical Reports Server (NTRS)

    Haskell, R. E. (Inventor)

    1979-01-01

    A method for processing multispectral data is provided, which permits an operator to make parameter level changes during the processing of the data. The system is directed to production of a color classification map on a video display in which a given color represents a localized region in multispectral feature space. Interactive controls permit an operator to alter the size and change the location of these regions, permitting the classification of such region to be changed from a broad to a narrow classification.

  2. Fourier multispectral imaging.

    PubMed

    Jia, Jie; Ni, Chuan; Sarangan, Andrew; Hirakawa, Keigo

    2015-08-24

    Current multispectral imaging systems use narrowband filters to capture the spectral content of a scene, which necessitates different filters to be designed for each application. In this paper, we demonstrate the concept of Fourier multispectral imaging which uses filters with sinusoidally varying transmittance. We designed and built these filters employing a single-cavity resonance, and made spectral measurements with a multispectral LED array. The measurements show that spectral features such as transmission and absorption peaks are preserved with this technique, which makes it a versatile technique than narrowband filters for a wide range of multispectral imaging applications.

  3. Observation of wave celerity evolution in the nearshore using digital video imagery

    NASA Astrophysics Data System (ADS)

    Yoo, J.; Fritz, H. M.; Haas, K. A.; Work, P. A.; Barnes, C. F.; Cho, Y.

    2008-12-01

    Celerity of incident waves in the nearshore is observed from oblique video imagery collected at Myrtle Beach, S.C.. The video camera covers the field view of length scales O(100) m. Celerity of waves propagating in shallow water including the surf zone is estimated by applying advanced image processing and analysis methods to the individual video images sampled at 3 Hz. Original image sequences are processed through video image frame differencing, directional low-pass image filtering to reduce the noise arising from foam in the surf zone. The breaking wave celerity is computed along a cross-shore transect from the wave crest tracks extracted by a Radon transform-based line detection method. The observed celerity from the nearshore video imagery is larger than the linear wave celerity computed from the measured water depths over the entire surf zone. Compared to the nonlinear shallow water wave equation (NSWE)-based celerity computed using the measured depths and wave heights, in general, the video-based celerity shows good agreements over the surf zone except the regions across the incipient wave breaking locations. In the regions across the breaker points, the observed wave celerity is even larger than the NSWE-based celerity due to the transition of wave crest shapes. The observed celerity using the video imagery can be used to monitor the nearshore geometry through depth inversion based on the nonlinear wave celerity theories. For this purpose, the exceeding celerity across the breaker points needs to be corrected accordingly compared to a nonlinear wave celerity theory applied.

  4. Using Video Games to Enhance Motivation States in Online Education: Protocol for a Team-Based Digital Game.

    PubMed

    Janssen, Anna; Shaw, Tim; Goodyear, Peter

    2015-09-28

    Video and computer games for education have been of interest to researchers for several decades. Over the last half decade, researchers in the health sector have also begun exploring the value of this medium. However, there are still many gaps in the literature regarding the effective use of video and computer games in medical education, particularly in relation to how learners interact with the platform, and how the games can be used to enhance collaboration. The objective of the study is to evaluate a team-based digital game as an educational tool for engaging learners and supporting knowledge consolidation in postgraduate medical education. A mixed methodology will be used in order to establish efficacy and level of motivation provided by a team-based digital game. Second-year medical students will be recruited as participants to complete 3 matches of the game at spaced intervals, in 2 evenly distributed teams. Prior to playing the game, participants will complete an Internet survey to establish baseline data. After playing the game, participants will voluntarily complete a semistructured interview to establish motivation and player engagement. Additionally, metrics collected from the game platform will be analyzed to determine efficacy. The research is in the preliminary stages, but thus far a total of 54 participants have been recruited into the study. Additionally, a content development group has been convened to develop appropriate content for the platform. Video and computer games have been demonstrated to have value for educational purposes. Significantly less research has addressed how the medium can be effectively utilized in the health sector. Preliminary data from this study would suggest there is an interest in games for learning in the medical student body. As such, it is beneficial to undertake further research into how these games teach and engage learners in order to evaluate their role in tertiary and postgraduate medical education in the future.

  5. Using Video Games to Enhance Motivation States in Online Education: Protocol for a Team-Based Digital Game

    PubMed Central

    Shaw, Tim; Goodyear, Peter

    2015-01-01

    Background Video and computer games for education have been of interest to researchers for several decades. Over the last half decade, researchers in the health sector have also begun exploring the value of this medium. However, there are still many gaps in the literature regarding the effective use of video and computer games in medical education, particularly in relation to how learners interact with the platform, and how the games can be used to enhance collaboration. Objective The objective of the study is to evaluate a team-based digital game as an educational tool for engaging learners and supporting knowledge consolidation in postgraduate medical education. Methods A mixed methodology will be used in order to establish efficacy and level of motivation provided by a team-based digital game. Second-year medical students will be recruited as participants to complete 3 matches of the game at spaced intervals, in 2 evenly distributed teams. Prior to playing the game, participants will complete an Internet survey to establish baseline data. After playing the game, participants will voluntarily complete a semistructured interview to establish motivation and player engagement. Additionally, metrics collected from the game platform will be analyzed to determine efficacy. Results The research is in the preliminary stages, but thus far a total of 54 participants have been recruited into the study. Additionally, a content development group has been convened to develop appropriate content for the platform. Conclusions Video and computer games have been demonstrated to have value for educational purposes. Significantly less research has addressed how the medium can be effectively utilized in the health sector. Preliminary data from this study would suggest there is an interest in games for learning in the medical student body. As such, it is beneficial to undertake further research into how these games teach and engage learners in order to evaluate their role in tertiary

  6. Title: Using Video to Enhance a Citizen Science Program: Digital Earth Watch And The Picture Post Network

    NASA Astrophysics Data System (ADS)

    Smith, J. D.; Beaudry, J.; Schloss, A. L.; Pickle, J.

    2012-12-01

    Digital Earth Watch (DEW) involves individuals, schools, organizations and communities in a systematic monitoring project of their local environment, especially vegetation health. The DEW Picture Post network offers people the means to make and share their own observations. A Picture Post is an easy-to-use and inexpensive platform for repeatedly taking digital photographs as a standardized set of images of the entire 360° landscape, which then can be shared over the Internet on the Picture Post website. This simple concept has the potential to create a wealth of information and data on changing environmental conditions, which is important for a society grappling with the effects of climate change. As a web-based program, it is critical to bring in new participants and to convey technical, scientific, and participant information with little or no human interaction. Once they get going, it is also important to keep participants engaged by getting their feedback as well as by sharing their experiences. This presentation will demonstrate our use of video to enhance the program, in particular the power of video for teaching skills needed to start up and contribute to a picture post, to convey findings and other scientific information collected at picture posts, and to engage participants and the community in an ongoing effort in monitoring and understanding their local environment and changing conditions. A DEW video library is being developed by a collaborative effort led by the University of New Hampshire with the University of Southern Maine, and Concord Academy. We invite individuals, schools, informal education centers, groups and communities to join: visit us atPicture Post is supported by NASA

  7. Performance of a digital video camcorder for the Autonomous Biological System experiment onboard Space Station Mir.

    PubMed

    Yamashita, M; Sasada, M; Sugiura, K; Ishikawa, Y; Kobayashi, K; Mizutani, H; Kawasaki, Y; Koike, J; Ijiri, K; Poynter, J; MacCallum, T; Anderson, G

    1998-12-01

    A video imaging and recording system was utilized in the Autonomous Biological System experiment onboard the space station Mir. Video image of the mini-ecological system was successfully recorded. The whole system was retrieved to the ground after its operation in orbit for four months. Performance of the video system is summarized here together with technical problems encountered. Defects of pixel had been developed in the imaging device. Cause of these defects could be attributed to its exposure against space radiation. Auto white balance was another function of the camcorder that was deviated from normal range of its performance once in orbit but recovered to normal after a while. Possible use of imaging devices for dosimetry is proposed to record space radiation environment at the site close to the experiment.

  8. Immersive video

    NASA Astrophysics Data System (ADS)

    Moezzi, Saied; Katkere, Arun L.; Jain, Ramesh C.

    1996-03-01

    Interactive video and television viewers should have the power to control their viewing position. To make this a reality, we introduce the concept of Immersive Video, which employs computer vision and computer graphics technologies to provide remote users a sense of complete immersion when viewing an event. Immersive Video uses multiple videos of an event, captured from different perspectives, to generate a full 3D digital video of that event. That is accomplished by assimilating important information from each video stream into a comprehensive, dynamic, 3D model of the environment. Using this 3D digital video, interactive viewers can then move around the remote environment and observe the events taking place from any desired perspective. Our Immersive Video System currently provides interactive viewing and `walkthrus' of staged karate demonstrations, basketball games, dance performances, and typical campus scenes. In its full realization, Immersive Video will be a paradigm shift in visual communication which will revolutionize television and video media, and become an integral part of future telepresence and virtual reality systems.

  9. Unsupervised classification of remote multispectral sensing data

    NASA Technical Reports Server (NTRS)

    Su, M. Y.

    1972-01-01

    The new unsupervised classification technique for classifying multispectral remote sensing data which can be either from the multispectral scanner or digitized color-separation aerial photographs consists of two parts: (a) a sequential statistical clustering which is a one-pass sequential variance analysis and (b) a generalized K-means clustering. In this composite clustering technique, the output of (a) is a set of initial clusters which are input to (b) for further improvement by an iterative scheme. Applications of the technique using an IBM-7094 computer on multispectral data sets over Purdue's Flight Line C-1 and the Yellowstone National Park test site have been accomplished. Comparisons between the classification maps by the unsupervised technique and the supervised maximum liklihood technique indicate that the classification accuracies are in agreement.

  10. Highly Protable Airborne Multispectral Imaging System

    NASA Technical Reports Server (NTRS)

    Lehnemann, Robert; Mcnamee, Todd

    2001-01-01

    A portable instrumentation system is described that includes and airborne and a ground-based subsytem. It can acquire multispectral image data over swaths of terrain ranging in width from about 1.5 to 1 km. The system was developed especially for use in coastal environments and is well suited for performing remote sensing and general environmental monitoring. It includes a small,munpilotaed, remotely controlled airplance that carries a forward-looking camera for navigation, three downward-looking monochrome video cameras for imaging terrain in three spectral bands, a video transmitter, and a Global Positioning System (GPS) reciever.

  11. The Surgeon's View: Comparison of Two Digital Video Recording Systems in Veterinary Surgery.

    PubMed

    Giusto, Gessica; Caramello, Vittorio; Comino, Francesco; Gandini, Marco

    2015-01-01

    Video recording and photography during surgical procedures are useful in veterinary medicine for several reasons, including legal, educational, and archival purposes. Many systems are available, such as hand cameras, light-mounted cameras, and head cameras. We chose a reasonably priced head camera that is among the smallest video cameras available. To best describe its possible uses and advantages, we recorded video and images of eight different surgical cases and procedures, both in hospital and field settings. All procedures were recorded both with a head-mounted camera and a commercial hand-held photo camera. Then sixteen volunteers (eight senior clinicians and eight final-year students) completed an evaluation questionnaire. Both cameras produced high-quality photographs and videos, but observers rated the head camera significantly better regarding point of view and their understanding of the surgical operation. The head camera was considered significantly more useful in teaching surgical procedures. Interestingly, senior clinicians tended to assign generally lower scores compared to students. The head camera we tested is an effective, easy-to-use tool for recording surgeries and various veterinary procedures in all situations, with no need for assistance from a dedicated operator. It can be a valuable aid for veterinarians working in all fields of the profession and a useful tool for veterinary surgical education.

  12. Learning in Video Game Affinity Spaces. New Literacies and Digital Epistemologies. Volume 51

    ERIC Educational Resources Information Center

    Hayes, Elisabeth R., Ed.; Duncan, Sean C., Ed.

    2012-01-01

    As video games have become an important economic and cultural force, scholars are increasingly trying to better understand the ways that engagement with games may drive learning, literacy, and social participation in the twenty-first century. In this book, the authors consider games and just as importantly, the social interactions around games,…

  13. Listening for Competence through Documentation: Assessing Children with Language Delays Using Digital Video

    ERIC Educational Resources Information Center

    Suarez, Stephanie Cox; Daniels, Karen J.

    2009-01-01

    This case study uses documentation as a tool for formative assessment to interpret the learning of twin boys with significantly delayed language skills. Reggio-inspired documentation (the act of collecting, interpreting, and reflecting on traces of learning from video, images, and observation notes) focused on the unfolding of the boys' nonverbal…

  14. Application of Core Science Concepts Using Digital Video: A "Hands-On" Laptop Approach

    ERIC Educational Resources Information Center

    Jarvinen, Michael Keith; Jarvinen, Lamis Zaher; Sheehan, Danielle N.

    2012-01-01

    Today's undergraduates are highly engaged in a variety of social media outlets. Given their comfort with technology, we wondered if we could use this phenomenon to teach science-related material. We asked students to use freeware to make a short video with text, images, and music as a way to explain scientific concepts that are traditionally…

  15. Village Voices, Global Visions: Digital Video as a Transformative Foreign Language Learning Tool

    ERIC Educational Resources Information Center

    Goulah, Jason

    2007-01-01

    This instrumental case study examines how adolescent high-intermediate Japanese language learners enrolled in a one-month credited abroad program used video as a mediational tool for (1) learning foreign language, content, and technology skills, (2) cultivating critical multiliteracies and transformative learning regarding geopolitics and the…

  16. An Exploratory Study of Digital Video Editing as a Tool for Teacher Preparation

    ERIC Educational Resources Information Center

    Calandra, Brendan; Gurvitch, Rachel; Lund, Jacalyn

    2008-01-01

    The authors' purpose was to examine teacher candidates' perspectives of successful teaching through personalized video vignettes. Furthermore, the authors were interested in how participants' written reflections might change as a result of creating these vignettes. This research used mixed-methods within the context of an exploratory multi-case…

  17. Application of Core Science Concepts Using Digital Video: A "Hands-On" Laptop Approach

    ERIC Educational Resources Information Center

    Jarvinen, Michael Keith; Jarvinen, Lamis Zaher; Sheehan, Danielle N.

    2012-01-01

    Today's undergraduates are highly engaged in a variety of social media outlets. Given their comfort with technology, we wondered if we could use this phenomenon to teach science-related material. We asked students to use freeware to make a short video with text, images, and music as a way to explain scientific concepts that are traditionally…

  18. Learning in Video Game Affinity Spaces. New Literacies and Digital Epistemologies. Volume 51

    ERIC Educational Resources Information Center

    Hayes, Elisabeth R., Ed.; Duncan, Sean C., Ed.

    2012-01-01

    As video games have become an important economic and cultural force, scholars are increasingly trying to better understand the ways that engagement with games may drive learning, literacy, and social participation in the twenty-first century. In this book, the authors consider games and just as importantly, the social interactions around games,…

  19. Listening for Competence through Documentation: Assessing Children with Language Delays Using Digital Video

    ERIC Educational Resources Information Center

    Suarez, Stephanie Cox; Daniels, Karen J.

    2009-01-01

    This case study uses documentation as a tool for formative assessment to interpret the learning of twin boys with significantly delayed language skills. Reggio-inspired documentation (the act of collecting, interpreting, and reflecting on traces of learning from video, images, and observation notes) focused on the unfolding of the boys' nonverbal…

  20. Digital Video Policy and Practice in Higher Education: From Gatekeeping to Viral Lectures

    ERIC Educational Resources Information Center

    Marchionini, Gary

    2008-01-01

    Many universities are providing video content such as lectures on the Web. The trend away from strong restrictions on instructional content toward more open-access policies offers exciting possibilities for extending classrooms beyond the campus but also brings new management challenges. This article describes some of the opportunities and…

  1. Picturing Video

    NASA Technical Reports Server (NTRS)

    2000-01-01

    Video Pics is a software program that generates high-quality photos from video. The software was developed under an SBIR contract with Marshall Space Flight Center by Redhawk Vision, Inc.--a subsidiary of Irvine Sensors Corporation. Video Pics takes information content from multiple frames of video and enhances the resolution of a selected frame. The resulting image has enhanced sharpness and clarity like that of a 35 mm photo. The images are generated as digital files and are compatible with image editing software.

  2. Video Compression

    NASA Technical Reports Server (NTRS)

    1996-01-01

    Optivision developed two PC-compatible boards and associated software under a Goddard Space Flight Center Small Business Innovation Research grant for NASA applications in areas such as telerobotics, telesciences and spaceborne experimentation. From this technology, the company used its own funds to develop commercial products, the OPTIVideo MPEG Encoder and Decoder, which are used for realtime video compression and decompression. They are used in commercial applications including interactive video databases and video transmission. The encoder converts video source material to a compressed digital form that can be stored or transmitted, and the decoder decompresses bit streams to provide high quality playback.

  3. Toward developing a unit of measure and scale of digital video quality: IEEE Broadcast Technology Society Subcomittee on Video Compression Measurements

    NASA Astrophysics Data System (ADS)

    Libert, John M.; Stanger, Leon; Watson, Andrew B.; Rohaly, Ann M.

    2000-06-01

    Development of video quality metrics has taken support from experimental vision data mainly at two levels of abstraction. On the one hand are the carefully controlled tests of human visual response to well-defined, controlled visual stimuli, such as the ModelFest study. On the other hand are experiments in which viewers rate the global quality of 'natural' video sequences exhibiting impairments of loosely-controlled composition and amplitude, as in the Video Quality Experts Group study. The IEEE Broadcast Technology Society Subcommittee on Video Compression Measurements has initiated an intermediate level approach to video quality assessment aimed toward developing a scale of video impairment and unit of measure by which to describe video distortion in both perceptual and engineering terms. The proposed IEEE study will attempt to define a scale of video impairment in terms of multiple measurements of the just-noticeable-difference (JND) of compression-induced video impairments. A paired comparison psychophysical method will be used to define a psychometric function of the visual sensitivity to compression-induced video impairments of various amplitudes. In this effort, quality assessment is related directly to visual perception of video impairments rather than to the more 'atomic' visual stimuli as used in many human vision experiments. Yet the experimenter's control over the stimuli is greater than that used in much of contemporary video quality testing.

  4. Scaling Sap Flow Results Over Wide Areas Using High-Resolution Aerial Multispectral Digital Imaging, Leaf Area Index (LAI) and MODIS Satellite Imagery in Saltcedar Stands on the Lower Colorado River

    NASA Astrophysics Data System (ADS)

    Murray, R.; Neale, C.; Nagler, P. L.; Glenn, E. P.

    2008-12-01

    Heat-balance sap flow sensors provide direct estimates of water movement through plant stems and can be used to accurately measure leaf-level transpiration (EL) and stomatal conductance (GS) over time scales ranging from 20-minutes to a month or longer in natural stands of plants. However, their use is limited to relatively small branches on shrubs or trees, as the gauged stem section needs to be uniformly heated by the heating coil to produce valid measurements. This presents a scaling problem in applying the results to whole plants, stands of plants, and larger landscape areas. We used high-resolution aerial multispectral digital imaging with green, red and NIR bands as a bridge between ground measurements of EL and GS, and MODIS satellite imagery of a flood plain on the Lower Colorado River dominated by saltcedar (Tamarix ramosissima). Saltcedar is considered to be a high-water-use plant, and saltcedar removal programs have been proposed to salvage water. Hence, knowledge of actual saltcedar ET rates is needed on western U.S. rivers. Scaling EL and GS to large landscape units requires knowledge of leaf area index (LAI) over large areas. We used a LAI model developed for riparian habitats on Bosque del Apache, New Mexico, to estimate LAI at our study site on the Colorado River. We compared the model estimates to ground measurements of LAI, determined with a Li-Cor LAI-2000 Plant Canopy Analyzer calibrated by leaf harvesting to determine Specific Leaf Area (SLA) (m2 leaf area per g dry weight leaves) of the different species on the floodplain. LAI could be adequately predicted from NDVI from aerial multispectral imagery and could be cross-calibrated with MODIS NDVI and EVI. Hence, we were able to project point measurements of sap flow and LAI over multiple years and over large areas of floodplain using aerial multispectral imagery as a bridge between ground and satellite data. The methods are applicable to riparian corridors throughout the western U.S.

  5. Use of 64 kbits/s digital channel for image transmission: Using low scan two-way video

    NASA Astrophysics Data System (ADS)

    Rahko, K.; Hongyan, L.; Kley, M.; Peuhkuri, M.; Rahko, M.

    1993-09-01

    At the seminar 'Competition in Telecommunications in Finland' on September 3rd, 1993, a test of two-way transferring an image by using 64 kbits/s digital channel was carried out. With the help of the Helsinki Telephone Company, a portrait was transferred to the lecture hall by using Vistacom Videophones, Nokia and Siemens ISDN exchange, as well as Nokia's and Siemens' user terminal equipment. It was shown on a screen through a video projector, so all visitors could see it. For human factors in telecommunications studies, every attendee was asked to give comments about the transferring quality. The report presents the results of the survey and a brief assessment of the technology.

  6. Multispectral Airborne Laser Scanning for Automated Map Updating

    NASA Astrophysics Data System (ADS)

    Matikainen, Leena; Hyyppä, Juha; Litkey, Paula

    2016-06-01

    During the last 20 years, airborne laser scanning (ALS), often combined with multispectral information from aerial images, has shown its high feasibility for automated mapping processes. Recently, the first multispectral airborne laser scanners have been launched, and multispectral information is for the first time directly available for 3D ALS point clouds. This article discusses the potential of this new single-sensor technology in map updating, especially in automated object detection and change detection. For our study, Optech Titan multispectral ALS data over a suburban area in Finland were acquired. Results from a random forests analysis suggest that the multispectral intensity information is useful for land cover classification, also when considering ground surface objects and classes, such as roads. An out-of-bag estimate for classification error was about 3% for separating classes asphalt, gravel, rocky areas and low vegetation from each other. For buildings and trees, it was under 1%. According to feature importance analyses, multispectral features based on several channels were more useful that those based on one channel. Automatic change detection utilizing the new multispectral ALS data, an old digital surface model (DSM) and old building vectors was also demonstrated. Overall, our first analyses suggest that the new data are very promising for further increasing the automation level in mapping. The multispectral ALS technology is independent of external illumination conditions, and intensity images produced from the data do not include shadows. These are significant advantages when the development of automated classification and change detection procedures is considered.

  7. Learning Trajectory for Transforming Teachers' Knowledge for Teaching Mathematics and Science with Digital Image and Video Technologies in an Online Learning Experience

    ERIC Educational Resources Information Center

    Niess, Margaret L.; Gillow-Wiles, Henry

    2014-01-01

    This qualitative cross-case study explores the influence of a designed learning trajectory on transforming teachers' technological pedagogical content knowledge (TPACK) for teaching with digital image and video technologies. The TPACK Learning Trajectory embeds tasks with specific instructional strategies within a social metacognitive…

  8. The Effect of Data Acquisition-Probeware and Digital Video Analysis on Accurate Graphical Representation of Kinetics in a High School Physics Class

    ERIC Educational Resources Information Center

    Struck, William; Yerrick, Randy

    2010-01-01

    The effects of two types of two well-established microcomputer-based teaching methods were examined for their effect on teaching high school students kinetics. The use of data acquisition probeware and digital video analysis were studied for their impact on students' conceptions and ability to interpret graphical relationships to real world…

  9. The Effect of Data Acquisition-Probeware and Digital Video Analysis on Accurate Graphical Representation of Kinetics in a High School Physics Class

    ERIC Educational Resources Information Center

    Struck, William; Yerrick, Randy

    2010-01-01

    The effects of two types of two well-established microcomputer-based teaching methods were examined for their effect on teaching high school students kinetics. The use of data acquisition probeware and digital video analysis were studied for their impact on students' conceptions and ability to interpret graphical relationships to real world…

  10. Intra-system reliability of SICS: video-tracking system (Digital.Stadium®) for performance analysis in football.

    PubMed

    Beato, Marco; Jamil, Mikael

    2017-05-09

    The correct evaluation of external load parameters is a key factor in professional football. The instrumentations usually utilised to quantify the external load parameters during official matches are Video-Tracking Systems (VTS). VTS is a technology that records two- dimensional position data (x and y) at high sampling rates (over 25 Hz). The aim of this study was to evaluate the intra-system reliability of Digital.Stadium® VTS. 28 professional male football players taking part in the Italian Serie A (age 24 ± 6 years, body mass 79.5 ± 7.8 kg, stature 1.83 ± 0.05 m) during the 2015/16 season were enrolled in this study (Team A and Team B). Video-analysis was done during an official match and data analysis was performed immediately after the game ended and then replicated a week later. This study reported a near perfect relationship between the initial analysis (analysis 1) and the replicated analysis undertaken a week later (analysis 2). R2 coefficients were highly significant for each of the performance parameters, p < 0.001. This study reported a mean TD = 8095 ± 3271 and 8073 ± 3263 m in analysis 1 and analysis 2, respectively. Players reported a mean distance covered over 25 w kg-1 equivalent to 1304 ± 673 m and 1294 ± 672 m, and they reported a mean metabolic power of 9.65 ± 1.64 w kg-1 and 9.58 ± 1.61 w kg-1, in analysis 1 and analysis 2, respectively. The findings reported in this study underlined that all data reported by Digital.Stadium® VTS showed high levels of absolute and relative reliability.

  11. A Study on the Read/Write Experimental Results for a High-Definition Digital Video Disc Recorder using Blue-Laser Diode

    NASA Astrophysics Data System (ADS)

    Aoki, Ikuo

    2001-03-01

    At present, tape media are mainly used for video recording globally. However, in the near future, disc media will come into general use, as they possess many strong points compared with tape media. Thus, we are now researching the development of a high-definition digital video disc recorder with high capacity, high data transfer rate, and low cost. Our target specifications are 15 GB to 18 GB, and over 35 Mbps, using a 120 mm phase change disc and a blue-laser diode. To confirm that it is possible, numerous sample discs were manufactured and experiments were carried out. We succeeded in obtaining good experimental results. In this study, we demonstrate the possibility of realizing a high-definition digital video disc recorder using a 120 mm phase change disc and a blue-laser diode without using a disc cartridge or any extraordinary method that increases the cost.

  12. Direct method for video-based navigation using a digital terrain map.

    PubMed

    Lerner, Ronen; Rivlin, Ehud

    2011-02-01

    A novel vision-based navigation algorithm is proposed. The gray levels of two images, together with a Digital Terrain Map (DTM), are directly utilized to define constraints on the navigation parameters. The feasibility of the algorithm is examined both under a simulated environment and using real flight data.

  13. Podcasting and Digital Video in the Classroom: A Call for Research

    ERIC Educational Resources Information Center

    Newman, John H.

    2011-01-01

    A case is directed at digital immigrants to utilize mobile computing devices such as an Apple iPod to deliver content to students in self-contained special education classrooms. The author discusses the current state of the use of iPods in classrooms, and how research using these devices has been limited to institutions of higher learning, while…

  14. Estimation of the Spectral Sensitivity Functions of Un-Modified and Modified Commercial Off-The Digital Cameras to Enable Their Use as a Multispectral Imaging System for Uavs

    NASA Astrophysics Data System (ADS)

    Berra, E.; Gibson-Poole, S.; MacArthur, A.; Gaulton, R.; Hamilton, A.

    2015-08-01

    Commercial off-the-shelf (COTS) digital cameras on-board unmanned aerial vehicles (UAVs) have the potential to be used as multispectral imaging systems; however, their spectral sensitivity is usually unknown and needs to be either measured or estimated. This paper details a step by step methodology for identifying the spectral sensitivity of modified (to be response to near infra-red wavelengths) and un-modified COTS digital cameras, showing the results of its application for three different models of camera. Six digital still cameras, which are being used as imaging systems on-board different UAVs, were selected to have their spectral sensitivities measured by a monochromator. Each camera was exposed to monochromatic light ranging from 370 nm to 1100 nm in 10 nm steps, with images of each step recorded in RAW format. The RAW images were converted linearly into TIFF images using DCRaw, an open-source program, before being batch processed through ImageJ (also open-source), which calculated the mean and standard deviation values from each of the red-green-blue (RGB) channels over a fixed central region within each image. These mean values were then related to the relative spectral radiance from the monochromator and its integrating sphere, in order to obtain the relative spectral response (RSR) for each of the cameras colour channels. It was found that different un-modified camera models present very different RSR in some channels, and one of the modified cameras showed a response that was unexpected. This highlights the need to determine the RSR of a camera before using it for any quantitative studies.

  15. Block-classified bidirectional motion compensation scheme for wavelet-decomposed digital video

    SciTech Connect

    Zafar, S.; Zhang, Y.Q.; Jabbari, B.

    1997-08-01

    In this paper the authors introduce a block-classified bidirectional motion compensation scheme for the previously developed wavelet-based video codec, where multiresolution motion estimation is performed in the wavelet domain. The frame classification structure described in this paper is similar to that used in the MPEG standard. Specifically, the I-frames are intraframe coded, the P-frames are interpolated from a previous I- or a P-frame, and the B-frames are bidirectional interpolated frames. They apply this frame classification structure to the wavelet domain with variable block sizes and multiresolution representation. They use a symmetric bidirectional scheme for the B-frames and classify the motion blocks as intraframe, compensated either from the preceding or the following frame, or bidirectional (i.e., compensated based on which type yields the minimum energy). They also introduce the concept of F-frames, which are analogous to P-frames but are predicted from the following frame only. This improves the overall quality of the reconstruction in a group of pictures (GOP) but at the expense of extra buffering. They also study the effect of quantization of the I-frames on the reconstruction of a GOP, and they provide intuitive explanation for the results. In addition, the authors study a variety of wavelet filter-banks to be used in a multiresolution motion-compensated hierarchical video codec.

  16. Video Completion in Digital Stabilization Task Using Pseudo-Panoramic Technique

    NASA Astrophysics Data System (ADS)

    Favorskaya, M. N.; Buryachenko, V. V.; Zotin, A. G.; Pakhirka, A. I.

    2017-05-01

    Video completion is a necessary stage after stabilization of a non-stationary video sequence, if it is desirable to make the resolution of the stabilized frames equalled the resolution of the original frames. Usually the cropped stabilized frames lose 10-20% of area that means the worse visibility of the reconstructed scenes. The extension of a view of field may appear due to the pan-tilt-zoom unwanted camera movement. Our approach deals with a preparing of pseudo-panoramic key frame during a stabilization stage as a pre-processing step for the following inpainting. It is based on a multi-layered representation of each frame including the background and objects, moving differently. The proposed algorithm involves four steps, such as the background completion, local motion inpainting, local warping, and seamless blending. Our experiments show that a necessity of a seamless stitching occurs often than a local warping step. Therefore, a seamless blending was investigated in details including four main categories, such as feathering-based, pyramid-based, gradient-based, and optimal seam-based blending.

  17. Digital stereoscopic convergence where video games and movies for the home user meet

    NASA Astrophysics Data System (ADS)

    Schur, Ethan

    2009-02-01

    Today there is a proliferation of stereoscopic 3D display devices, 3D content, and 3D enabled video games. As we in the S-3D community bring stereoscopic 3D to the home user we have a real opportunity of using stereoscopic 3D to bridge the gap between exciting immersive games and home movies. But to do this, we cannot limit ourselves to current conceptions of gaming and movies. We need, for example, to imagine a movie that is fully rendered using avatars in a stereoscopic game environment. Or perhaps to imagine a pervasive drama where viewers can play too and become an essential part of the drama - whether at home or on the go on a mobile platform. Stereoscopic 3D is the "glue" that will bind these video and movie concepts together. As users feel more immersed, the lines between current media will blur. This means that we have the opportunity to shape the way that we, as humans, view and interact with each other, our surroundings and our most fundamental art forms. The goal of this paper is to stimulate conversation and further development on expanding the current gaming and home theatre infrastructures to support greatly-enhanced experiential entertainment.

  18. Multispectral vegetative canopy parameter retrieval

    NASA Astrophysics Data System (ADS)

    Borel, Christoph C.; Bunker, David J.

    2011-11-01

    Precision agriculture, forestry and environmental remote sensing are applications uniquely suited to the 8 bands that DigitalGlobe's WorldView-2 provides. At the fine spatial resolution of 0.5 m (panchromatic) and 2 m (multispectral) individual trees can be readily resolved. Recent research [1] has shown that it is possible for hyper-spectral data to invert plant reflectance spectra and estimate nitrogen content, leaf water content, leaf structure, canopy leaf area index and, for sparse canopies, also soil reflectance. The retrieval is based on inverting the SAIL (Scattering by Arbitrary Inclined Leaves) vegetation radiative transfer model for the canopy structure and the reflectance model PROSPECT4/5 for the leaf reflectance. Working on the paper [1] confirmed that a limited number of adjacent bands covering just the visible and near infrared can retrieve the parameters as well, opening up the possibility that this method can be used to analyze multi-spectral WV-2 data. Thus it seems possible to create WV-2 specific inversions using 8 bands and apply them to imagery of various vegetation covered surfaces of agricultural and environmental interest. The capability of retrieving leaf water content and nitrogen content has important applications in determining the health of vegetation, e.g. plant growth status, disease mapping, quantitative drought assessment, nitrogen deficiency, plant vigor, yield, etc.

  19. System for delivery of broadcast digital video as an overlay to baseband switched services on a fiber-to-the-home access network

    NASA Astrophysics Data System (ADS)

    Chand, Naresh; Magill, Peter D.; Swaminathan, Venkat S.; Yadvish, R. D.

    1999-04-01

    For low cost fiber-to-the-home (FTTH) passive optical networks (PON), we have studied the delivery of broadcast digital video as an overlay to baseband switched digital services on the same fiber using a single transmitter and a single receiver. We have multiplexed the baseband data at 155.52 Mbps with digital video QPSK channels in the 270 - 1450 MHz range with minimal degradation. We used an additional 860 MHz carrier modulated with 8 Mbps QPSK as a test-signal. An optical to electrical (O/E) receiver using an APD satisfies the power budget needs of ITU-T document G983.x for both class B and C operations (i.e., receiver sensitivity less than -33 dBm for a 10-10 bit error rate) without any FEC for both data and video. The PIN diode O/E receiver nearly satisfies the need for class B operation (-30 dBm receiver sensitivity) of G983 with FEC in QPSK FDM video. For a 155.52 Mbps baseband data transmission and for a given bit error rate, there is approximately 6 dBo1 optical power penalty due to video overlay. Of this, 1 dBo penalty is due to biasing the laser with an extinction ratio reduced from 10 dBo to approximately 6 dBo, and approximately 5 dBo penalty is due to receiver bandwidth increasing from approximately 100 MHz to approximately 1 GHz. The penalty due to receiver is after optimizing the filter for baseband data, and is caused by the reduced value of feedback resistor of the first stage transimpedance amplifier. The optical power penalty for video transmission is about 2 dBo due to reduced optical modulation index.

  20. Commercial Applications Multispectral Sensor System

    NASA Technical Reports Server (NTRS)

    Birk, Ronald J.; Spiering, Bruce

    1993-01-01

    NASA's Office of Commercial Programs is funding a multispectral sensor system to be used in the development of remote sensing applications. The Airborne Terrestrial Applications Sensor (ATLAS) is designed to provide versatility in acquiring spectral and spatial information. The ATLAS system will be a test bed for the development of specifications for airborne and spaceborne remote sensing instrumentation for dedicated applications. This objective requires spectral coverage from the visible through thermal infrared wavelengths, variable spatial resolution from 2-25 meters; high geometric and geo-location accuracy; on-board radiometric calibration; digital recording; and optimized performance for minimized cost, size, and weight. ATLAS is scheduled to be available in 3rd quarter 1992 for acquisition of data for applications such as environmental monitoring, facilities management, geographic information systems data base development, and mineral exploration.

  1. Paired comparison of the sensitivity and specificity of multispectral digital skin lesion analysis and reflectance confocal microscopy in the detection of melanoma in vivo: A cross-sectional study.

    PubMed

    Song, Eunice; Grant-Kels, Jane M; Swede, Helen; D'Antonio, Jody L; Lachance, Avery; Dadras, Soheil S; Kristjansson, Arni K; Ferenczi, Katalin; Makkar, Hanspaul S; Rothe, Marti J

    2016-12-01

    Several technologies have been developed to aid dermatologists in the detection of melanoma in vivo including dermoscopy, multispectral digital skin lesion analysis (MDSLA), and reflectance confocal microscopy (RCM). To our knowledge, there have been no studies directly comparing MDSLA and RCM. We conducted a repeated measures analysis comparing the sensitivity and specificity of MDSLA and RCM in the detection of melanoma (n = 55 lesions from 36 patients). Study patients (n = 36) with atypical-appearing pigmented lesions (n = 55) underwent imaging by both RCM and MDSLA. Lesions were biopsied and analyzed by histopathology. RCM exhibited superior test metrics (P = .001, McNemar test) compared with MDSLA. Respectively, sensitivity measures were 85.7% and 71.4%, and specificity rates were 66.7% and 25.0%. The sample size was relatively small and was collected from only one dermatologist's patient base; there was some degree of dermatopathologist interobserver variability; and only one confocalist performed the RCM image evaluations. RCM is a useful adjunct during clinical assessment of in vivo lesions suspicious for melanoma or those requiring re-excision because of high level of dysplasia or having features consistent with an atypical melanocytic nevus with severe cytologic atypia. Copyright © 2016 American Academy of Dermatology, Inc. Published by Elsevier Inc. All rights reserved.

  2. Digital Preservation and Deep Infrastructure; Dublin Core Metadata Initiative Progress Report and Workplan for 2002; Video Gaming, Education and Digital Learning Technologies: Relevance and Opportunities; Digital Collections of Real World Objects; The MusArt Music-Retrieval System: An Overview; eML: Taking Mississippi Libraries into the 21st Century.

    ERIC Educational Resources Information Center

    Granger, Stewart; Dekkers, Makx; Weibel, Stuart L.; Kirriemuir, John; Lensch, Hendrik P. A.; Goesele, Michael; Seidel, Hans-Peter; Birmingham, William; Pardo, Bryan; Meek, Colin; Shifrin, Jonah; Goodvin, Renee; Lippy, Brooke

    2002-01-01

    One opinion piece and five articles in this issue discuss: digital preservation infrastructure; accomplishments and changes in the Dublin Core Metadata Initiative in 2001 and plans for 2002; video gaming and how it relates to digital libraries and learning technologies; overview of a music retrieval system; and the online version of the…

  3. Implementation and evaluation of ILLIAC 4 algorithms for multispectral image processing

    NASA Technical Reports Server (NTRS)

    Swain, P. H.

    1974-01-01

    Data concerning a multidisciplinary and multi-organizational effort to implement multispectral data analysis algorithms on a revolutionary computer, the Illiac 4, are reported. The effectiveness and efficiency of implementing the digital multispectral data analysis techniques for producing useful land use classifications from satellite collected data were demonstrated.

  4. Multispectral photography for earth resources

    NASA Technical Reports Server (NTRS)

    Wenderoth, S.; Yost, E.; Kalia, R.; Anderson, R.

    1972-01-01

    A guide for producing accurate multispectral results for earth resource applications is presented along with theoretical and analytical concepts of color and multispectral photography. Topics discussed include: capabilities and limitations of color and color infrared films; image color measurements; methods of relating ground phenomena to film density and color measurement; sensitometry; considerations in the selection of multispectral cameras and components; and mission planning.

  5. Multispectral imaging probe

    DOEpatents

    Sandison, D.R.; Platzbecker, M.R.; Descour, M.R.; Armour, D.L.; Craig, M.J.; Richards-Kortum, R.

    1999-07-27

    A multispectral imaging probe delivers a range of wavelengths of excitation light to a target and collects a range of expressed light wavelengths. The multispectral imaging probe is adapted for mobile use and use in confined spaces, and is sealed against the effects of hostile environments. The multispectral imaging probe comprises a housing that defines a sealed volume that is substantially sealed from the surrounding environment. A beam splitting device mounts within the sealed volume. Excitation light is directed to the beam splitting device, which directs the excitation light to a target. Expressed light from the target reaches the beam splitting device along a path coaxial with the path traveled by the excitation light from the beam splitting device to the target. The beam splitting device directs expressed light to a collection subsystem for delivery to a detector. 8 figs.

  6. Multispectral imaging probe

    SciTech Connect

    Sandison, D.R.; Platzbecker, M.R.; Descour, M.R.; Armour, D.L.; Craig, M.J.; Richards-Kortum, R.

    1999-07-27

    A multispectral imaging probe delivers a range of wavelengths of excitation light to a target and collects a range of expressed light wavelengths. The multispectral imaging probe is adapted for mobile use and use in confined spaces, and is sealed against the effects of hostile environments. The multispectral imaging probe comprises a housing that defines a sealed volume that is substantially sealed from the surrounding environment. A beam splitting device mounts within the sealed volume. Excitation light is directed to the beam splitting device, which directs the excitation light to a target. Expressed light from the target reaches the beam splitting device along a path coaxial with the path traveled by the excitation light from the beam splitting device to the target. The beam splitting device directs expressed light to a collection subsystem for delivery to a detector. 8 figs.

  7. Multispectral imaging probe

    SciTech Connect

    Sandison, David R.; Platzbecker, Mark R.; Descour, Michael R.; Armour, David L.; Craig, Marcus J.; Richards-Kortum, Rebecca

    1999-01-01

    A multispectral imaging probe delivers a range of wavelengths of excitation light to a target and collects a range of expressed light wavelengths. The multispectral imaging probe is adapted for mobile use and use in confined spaces, and is sealed against the effects of hostile environments. The multispectral imaging probe comprises a housing that defines a sealed volume that is substantially sealed from the surrounding environment. A beam splitting device mounts within the sealed volume. Excitation light is directed to the beam splitting device, which directs the excitation light to a target. Expressed light from the target reaches the beam splitting device along a path coaxial with the path traveled by the excitation light from the beam splitting device to the target. The beam splitting device directs expressed light to a collection subsystem for delivery to a detector.

  8. Computerized 3-dimensional localization of a video capsule in the abdominal cavity: validation by digital radiography.

    PubMed

    Marya, Neil; Karellas, Andrew; Foley, Anne; Roychowdhury, Abhijit; Cave, David

    2014-04-01

    Wireless video capsule endoscopy allows the noninvasive visualization of the small intestine. Currently, capsules do not provide localization information while traversing the GI tract. To report on the radiological validation of 3-dimensional localization software incorporated in a newly developed capsule. By using radiofrequency transmission, the software measures the strength of the capsule's signal to locate the position of the capsule. This study was performed at the University of Massachusetts Medical Center, Worcester, Mass. Thirty healthy volunteers consented to the experimental procedure. After ingestion of the capsule, subjects had 5 sets of anteroposterior and lateral radiographs taken every 30 minutes while the software calculated the position of the capsule. By using the radiographs, we calculated the location of the capsule in the abdominal cavity and compared the results with those generated by the software. Average error (and standard deviation) among the 3-dimensional coordinates was X, 2.00 cm (1.64); Y, 2.64 cm (2.39); and Z, 2.51 cm (1.83). The average total spatial error among all measurements was 13.26 cm(3) (22.72). There was a correlation between increased subject body mass index and the 3-dimensional software measurement error. This study was performed in healthy volunteers and needs further validation in patients with small intestinal disorders. The new 3-dimensional software provides localization of the capsule consistent with radiological observations. However, further validation of the software's clinical utility is required with a prospective clinical trial. Copyright © 2014 American Society for Gastrointestinal Endoscopy. Published by Mosby, Inc. All rights reserved.

  9. KID Project: an internet-based digital video atlas of capsule endoscopy for research purposes.

    PubMed

    Koulaouzidis, Anastasios; Iakovidis, Dimitris K; Yung, Diana E; Rondonotti, Emanuele; Kopylov, Uri; Plevris, John N; Toth, Ervin; Eliakim, Abraham; Wurm Johansson, Gabrielle; Marlicz, Wojciech; Mavrogenis, Georgios; Nemeth, Artur; Thorlacius, Henrik; Tontini, Gian Eugenio

    2017-06-01

     Capsule endoscopy (CE) has revolutionized small-bowel (SB) investigation. Computational methods can enhance diagnostic yield (DY); however, incorporating machine learning algorithms (MLAs) into CE reading is difficult as large amounts of image annotations are required for training. Current databases lack graphic annotations of pathologies and cannot be used. A novel database, KID, aims to provide a reference for research and development of medical decision support systems (MDSS) for CE.  Open-source software was used for the KID database. Clinicians contribute anonymized, annotated CE images and videos. Graphic annotations are supported by an open-access annotation tool (Ratsnake). We detail an experiment based on the KID database, examining differences in SB lesion measurement between human readers and a MLA. The Jaccard Index (JI) was used to evaluate similarity between annotations by the MLA and human readers.  The MLA performed best in measuring lymphangiectasias with a JI of 81 ± 6 %. The other lesion types were: angioectasias (JI 64 ± 11 %), aphthae (JI 64 ± 8 %), chylous cysts (JI 70 ± 14 %), polypoid lesions (JI 75 ± 21 %), and ulcers (JI 56 ± 9 %).  MLA can perform as well as human readers in the measurement of SB angioectasias in white light (WL). Automated lesion measurement is therefore feasible. KID is currently the only open-source CE database developed specifically to aid development of MDSS. Our experiment demonstrates this potential.

  10. Clinically evaluated procedure for the reconstruction of vocal fold vibrations from endoscopic digital high-speed videos.

    PubMed

    Lohscheller, Jörg; Toy, Hikmet; Rosanowski, Frank; Eysholdt, Ulrich; Döllinger, Michael

    2007-08-01

    Investigation of voice disorders requires the examination of vocal fold vibrations. State of the art is the recording of endoscopic high-speed movies which capture vocal fold vibrations in real-time. It enables investigating the interrelation between disturbances of vocal fold vibrations and voice disorders. However, the lack of clinical studies and of a standardized procedure to reconstruct vocal fold vibrations from high-speed videos constrain the clinical acceptance of the high-speed technique. An image processing approach is presented that extracts the vibrating vocal fold edges from digital high-speed movies. The initial segmentation is principally based on a seeded region-growing algorithm. Even in movies with low image quality the algorithm segments successfully the glottal area by an introduced two-dimensional threshold matrix. Following segmentation, the vocal fold edges are reconstructed from the computed time-varying glottal area. The performance of the procedure was objectively evaluated within a study comprising 372 high-speed recordings. The accuracy of vocal fold reconstruction exceeds manual segmentation results obtained by clinical experts. The algorithm reaches an information flow-rate of up to 98 images per second. The robustness and high accuracy of the procedure makes it suitable for the application in clinical routine. It enables an objective and highly accurate description of vocal fold vibrations which is essential to realize extensive clinical studies which focus on the classification of voice disorders.

  11. Quantifying Fish Swimming Behavior in Response to Acute Exposure of Aqueous Copper Using Computer Assisted Video and Digital Image Analysis

    PubMed Central

    Calfee, Robin D.; Puglis, Holly J.; Little, Edward E.; Brumbaugh, William G.; Mebane, Christopher A.

    2016-01-01

    Behavioral responses of aquatic organisms to environmental contaminants can be precursors of other effects such as survival, growth, or reproduction. However, these responses may be subtle, and measurement can be challenging. Using juvenile white sturgeon (Acipenser transmontanus) with copper exposures, this paper illustrates techniques used for quantifying behavioral responses using computer assisted video and digital image analysis. In previous studies severe impairments in swimming behavior were observed among early life stage white sturgeon during acute and chronic exposures to copper. Sturgeon behavior was rapidly impaired and to the extent that survival in the field would be jeopardized, as fish would be swept downstream, or readily captured by predators. The objectives of this investigation were to illustrate protocols to quantify swimming activity during a series of acute copper exposures to determine time to effect during early lifestage development, and to understand the significance of these responses relative to survival of these vulnerable early lifestage fish. With mortality being on a time continuum, determining when copper first affects swimming ability helps us to understand the implications for population level effects. The techniques used are readily adaptable to experimental designs with other organisms and stressors. PMID:26967350

  12. Quantifying fish swimming behavior in response to acute exposure of aqueous copper using computer assisted video and digital image analysis

    USGS Publications Warehouse

    Calfee, Robin D.; Puglis, Holly J.; Little, Edward E.; Brumbaugh, William G.; Mebane, Christopher A.

    2016-01-01

    Behavioral responses of aquatic organisms to environmental contaminants can be precursors of other effects such as survival, growth, or reproduction. However, these responses may be subtle, and measurement can be challenging. Using juvenile white sturgeon (Acipenser transmontanus) with copper exposures, this paper illustrates techniques used for quantifying behavioral responses using computer assisted video and digital image analysis. In previous studies severe impairments in swimming behavior were observed among early life stage white sturgeon during acute and chronic exposures to copper. Sturgeon behavior was rapidly impaired and to the extent that survival in the field would be jeopardized, as fish would be swept downstream, or readily captured by predators. The objectives of this investigation were to illustrate protocols to quantify swimming activity during a series of acute copper exposures to determine time to effect during early lifestage development, and to understand the significance of these responses relative to survival of these vulnerable early lifestage fish. With mortality being on a time continuum, determining when copper first affects swimming ability helps us to understand the implications for population level effects. The techniques used are readily adaptable to experimental designs with other organisms and stressors.

  13. Development of a digital video-microscopy technique to study lactose crystallisation kinetics in situ.

    PubMed

    Arellano, María Paz; Aguilera, José Miguel; Bouchon, Pedro

    2004-11-15

    Polarised light microscopy was employed non-invasively to monitor lactose crystallisation from non-seeded supersaturated solutions in real time. Images were continuously recorded, processed and characterised by image analysis, and the results were compared with those obtained by refractometry. Three crystallisation temperatures (10, 20 and 30 degrees C) and three different levels of initial relative supersaturation (C/C(s)=1.95; 2.34; 3.15) were investigated. Induction times using the imaging technique proved to be substantially lower than those determined using refractive index. Lactose crystals were isolated digitally to determine geometrical parameters of interest, such as perimeter, diameter, area, roundness and Feret mean, and to derive crystal growth rates. Mean growth rates obtained for single crystals were fitted to a combined mass transfer model (R(2)=0.9766). The model allowed the effects of temperature and supersaturation on crystallisation rate to be clearly identified. It also suggested that, in this set of experiments, surface integration seemed to be the rate controlling step. It is believed that a similar experimental set-up could be implemented in a real food system to characterise a particular process where crystallisation control is of interest and where traditional techniques are difficult to implement.

  14. Gemvid, an open source, modular, automated activity recording system for rats using digital video

    PubMed Central

    Poirrier, Jean-Etienne; Poirrier, Laurent; Leprince, Pierre; Maquet, Pierre

    2006-01-01

    Background Measurement of locomotor activity is a valuable tool for analysing factors influencing behaviour and for investigating brain function. Several methods have been described in the literature for measuring the amount of animal movement but most are flawed or expensive. Here, we describe an open source, modular, low-cost, user-friendly, highly sensitive, non-invasive system that records all the movements of a rat in its cage. Methods Our activity monitoring system quantifies overall free movements of rodents without any markers, using a commercially available CCTV and a newly designed motion detection software developed on a GNU/Linux-operating computer. The operating principle is that the amount of overall movement of an object can be expressed by the difference in total area occupied by the object in two consecutive picture frames. The application is based on software modules that allow the system to be used in a high-throughput workflow. Documentation, example files, source code and binary files can be freely downloaded from the project website at . Results In a series of experiments with objects of pre-defined oscillation frequencies and movements, we documented the sensitivity, reproducibility and stability of our system. We also compared data obtained with our system and data obtained with an Actiwatch device. Finally, to validate the system, results obtained from the automated observation of 6 rats during 7 days in a regular light cycle are presented and are accompanied by a stability test. The validity of this system is further demonstrated through the observation of 2 rats in constant dark conditions that displayed the expected free running of their circadian rhythm. Conclusion The present study describes a system that relies on video frame differences to automatically quantify overall free movements of a rodent without any markers. It allows the monitoring of rats in their own environment for an extended period of time. By using a low-cost, open

  15. Image denoising and deblurring using multispectral data

    NASA Astrophysics Data System (ADS)

    Semenishchev, E. A.; Voronin, V. V.; Marchuk, V. I.

    2017-05-01

    Currently decision-making systems get widespread. These systems are based on the analysis video sequences and also additional data. They are volume, change size, the behavior of one or a group of objects, temperature gradient, the presence of local areas with strong differences, and others. Security and control system are main areas of application. A noise on the images strongly influences the subsequent processing and decision making. This paper considers the problem of primary signal processing for solving the tasks of image denoising and deblurring of multispectral data. The additional information from multispectral channels can improve the efficiency of object classification. In this paper we use method of combining information about the objects obtained by the cameras in different frequency bands. We apply method based on simultaneous minimization L2 and the first order square difference sequence of estimates to denoising and restoring the blur on the edges. In case of loss of the information will be applied an approach based on the interpolation of data taken from the analysis of objects located in other areas and information obtained from multispectral camera. The effectiveness of the proposed approach is shown in a set of test images.

  16. Comparing soil boundaries delineated by digital analysis of multispectral scanner data from high and low spatial resolution systems. [Tippencanoe County, Indiana

    NASA Technical Reports Server (NTRS)

    Kristof, S. J. (Principal Investigator); Baumgardner, M. F.; Zachary, A. L.; Stoner, E. R.

    1977-01-01

    The author has identified the following significant results. Computer-aided analysis techniques used with aircraft MSS data showed that the spatial resolution was sufficient to recognize each soil mapping unit of the test site. Some difficulties occurred where different soil series were intricately mixed, and this mixture showed as a separate spectral mapping unit, or where the difference between two soils depended on the depth of silty surface material. Analysis of LANDSAT data with computer-aided techniques showed that it was not possible to find spectrally homogeneous soil features of the seven soil series on the 40 ha test site on the digital display or on a picture print map. Cluster techniques could be used on an extended test area to group spectrally similar data points into cluster classes.

  17. Digital video analysis of health professionals' interactions with an electronic whiteboard: a longitudinal, naturalistic study of changes to user interactions.

    PubMed

    Rasmussen, Rasmus; Kushniruk, Andre

    2013-12-01

    As hospital departments continue to introduce electronic whiteboards in real clinical settings a range of human factor issues have emerged and it has become clear that there is a need for improved methods for designing and testing these systems. In this study, we employed a longitudinal and naturalistic method in the usability evaluation of an electronic whiteboard system. The goal of the evaluation was to explore the extent to which usability issues experienced by users change as they gain more experience with the system. In addition, the paper explores the use of a new approach to collection and analysis of continuous digital video recordings of naturalistic "live" user interactions. The method developed and employed in the study included recording the users' interactions with system during actual use using screen-capturing software and analyzing these recordings for usability issues. In this paper we describe and discuss both the method and the results of the evaluation. We found that the electronic whiteboard system contains system-related usability issues that did not change over time as the clinicians collectively gained more experience with the system. Furthermore, we also found user-related issues that seemed to change as the users gained more experience and we discuss the underlying reasons for these changes. We also found that the method used in the study has certain advantages over traditional usability evaluation methods, including the ability to collect analyze live user data over time. However, challenges and drawbacks to using the method (including the time taken for analysis and logistical issues in doing live recordings) should be considered before utilizing a similar approach. In conclusion we summarize our findings and call for an increased focus on longitudinal and naturalistic evaluations of health information systems and encourage others to apply and refine the method utilized in this study.

  18. A randomized trial comparing digital video disc with written delivery of falls prevention education for older patients in hospital.

    PubMed

    Hill, Anne-Marie; McPhail, Steven; Hoffmann, Tammy; Hill, Keith; Oliver, David; Beer, Christopher; Brauer, Sandra; Haines, Terry P

    2009-08-01

    To compare the effectiveness of a digital video disc (DVD) with that of a written workbook delivering falls prevention education to older hospital patients on self-perceived risk of falls, perception of falls epidemiology, knowledge of prevention strategies, and motivation and confidence to engage in self-protective strategies. To compare the effect of receiving either education approach versus no education on patients' perception of falls epidemiology. Randomized trial (DVD vs workbook) with additional quasi-experimental control group. Geriatric, medical, and orthopedic wards in Perth and Brisbane, Australia. One hundred (n=51 DVD, n=49 workbook) hospital inpatients aged 60 and older receiving an intervention (mean age 75.3+/-10.1) and 122 in the control group (mean age 79.3+/-8.3). Participants randomly assigned to receive identical educational material on falls prevention delivered on a DVD or in a workbook. Control group received usual care. Custom-designed survey addressing elements of the Health Belief Model of health behavior change. Participants randomized to DVD delivery had a higher self-perceived risk of falling (P=.04) and higher levels of confidence (P=.03) and motivation (P=.04) to engage in self-protective strategies than participants who received the workbook. A higher proportion of participants who received either form of the education provided "desired" responses than of control group participants across all knowledge items (P<.001). Delivery of falls prevention education on a DVD compared to a written workbook is more likely to achieve important changes in parameters likely to affect successful uptake of falls prevention messages in the hospital setting.

  19. Study of a hybrid multispectral processor

    NASA Technical Reports Server (NTRS)

    Marshall, R. E.; Kriegler, F. J.

    1973-01-01

    A hybrid processor is described offering enough handling capacity and speed to process efficiently the large quantities of multispectral data that can be gathered by scanner systems such as MSDS, SKYLAB, ERTS, and ERIM M-7. Combinations of general-purpose and special-purpose hybrid computers were examined to include both analog and digital types as well as all-digital configurations. The current trend toward lower costs for medium-scale digital circuitry suggests that the all-digital approach may offer the better solution within the time frame of the next few years. The study recommends and defines such a hybrid digital computing system in which both special-purpose and general-purpose digital computers would be employed. The tasks of recognizing surface objects would be performed in a parallel, pipeline digital system while the tasks of control and monitoring would be handled by a medium-scale minicomputer system. A program to design and construct a small, prototype, all-digital system has been started.

  20. The trophic classification of lakes using ERTS multispectral scanner data

    NASA Technical Reports Server (NTRS)

    Blackwell, R. J.; Boland, D. H.

    1975-01-01

    Lake classification methods based on the use of ERTS data are described. Preliminary classification results obtained by multispectral and digital image processing techniques indicate satisfactory correlation between ERTS data and EPA-supplied water analysis. Techniques for determining lake trophic levels using ERTS data are examined, and data obtained for 20 lakes are discussed.

  1. The trophic classification of lakes using ERTS multispectral scanner data

    NASA Technical Reports Server (NTRS)

    Blackwell, R. J.; Boland, D. H.

    1975-01-01

    Lake classification methods based on the use of ERTS data are described. Preliminary classification results obtained by multispectral and digital image processing techniques indicate satisfactory correlation between ERTS data and EPA-supplied water analysis. Techniques for determining lake trophic levels using ERTS data are examined, and data obtained for 20 lakes are discussed.

  2. Bolus tracking with nanofilter-based multispectral videography for capturing microvasculature hemodynamics

    NASA Astrophysics Data System (ADS)

    Najiminaini, Mohamadreza; Kaminska, Bozena; St. Lawrence, Keith; Carson, Jeffrey J. L.

    2014-04-01

    Multispectral imaging is a highly desirable modality for material-based analysis in diverse areas such as food production and processing, satellite-based reconnaissance, and biomedical imaging. Here, we present nanofilter-based multispectral videography (nMSV) in the 700 to 950 nm range made possible by the tunable extraordinary-optical-transmission properties of 3D metallic nanostructures. Measurements made with nMSV during a bolus injection of an intravascular tracer in the ear of a piglet resulted in spectral videos of the microvasculature. Analysis of the multispectral videos generated contrast measurements representative of arterial pulsation, the distribution of microvascular transit times, as well as a separation of the venous and arterial signals arising from within the tissue. Therefore, nMSV is capable of acquiring serial multispectral images relevant to tissue hemodynamics, which may have application to the detection and identification of skin cancer.

  3. Bolus tracking with nanofilter-based multispectral videography for capturing microvasculature hemodynamics.

    PubMed

    Najiminaini, Mohamadreza; Kaminska, Bozena; St Lawrence, Keith; Carson, Jeffrey J L

    2014-04-24

    Multispectral imaging is a highly desirable modality for material-based analysis in diverse areas such as food production and processing, satellite-based reconnaissance, and biomedical imaging. Here, we present nanofilter-based multispectral videography (nMSV) in the 700 to 950 nm range made possible by the tunable extraordinary-optical-transmission properties of 3D metallic nanostructures. Measurements made with nMSV during a bolus injection of an intravascular tracer in the ear of a piglet resulted in spectral videos of the microvasculature. Analysis of the multispectral videos generated contrast measurements representative of arterial pulsation, the distribution of microvascular transit times, as well as a separation of the venous and arterial signals arising from within the tissue. Therefore, nMSV is capable of acquiring serial multispectral images relevant to tissue hemodynamics, which may have application to the detection and identification of skin cancer.

  4. Bolus tracking with nanofilter-based multispectral videography for capturing microvasculature hemodynamics

    PubMed Central

    Najiminaini, Mohamadreza; Kaminska, Bozena; St. Lawrence, Keith; Carson, Jeffrey J. L.

    2014-01-01

    Multispectral imaging is a highly desirable modality for material-based analysis in diverse areas such as food production and processing, satellite-based reconnaissance, and biomedical imaging. Here, we present nanofilter-based multispectral videography (nMSV) in the 700 to 950 nm range made possible by the tunable extraordinary-optical-transmission properties of 3D metallic nanostructures. Measurements made with nMSV during a bolus injection of an intravascular tracer in the ear of a piglet resulted in spectral videos of the microvasculature. Analysis of the multispectral videos generated contrast measurements representative of arterial pulsation, the distribution of microvascular transit times, as well as a separation of the venous and arterial signals arising from within the tissue. Therefore, nMSV is capable of acquiring serial multispectral images relevant to tissue hemodynamics, which may have application to the detection and identification of skin cancer. PMID:24759647

  5. Digital image processing for lithological and alteration mapping using SPOT multispectral data: a case study of Pariz area, Kerman Province, Iran

    NASA Astrophysics Data System (ADS)

    Ranjbar, Hojjatollah; Roonwal, Ganpat S.

    2002-01-01

    Tertiary porphyry deposits in Iran are an important source of Cu, Mo and locally Au. Most of the known porphyry Cu deposits are located in the Central Iranian Volcanic Belt(CIVB). Pariz area is located within this belt and is chosen as a test area to evaluate remote sensing data at one such area, and use of these data in exploration of the other parts of CIVB. Eight known mineralization sites were chosen in the area, which are mainly porphyry type. SPOT images in XS mode are used to study geology as well as hydrothermal alteration in the Pariz area, where soil and vegetation cover is substantially poor. Different approaches such as band ratioing, principal component analysis, I-S-H decorrelation processing, digital filtering and hybrid composite were used to enhance the diagnostic features associated with the lithologies as well as the hydrothermal alteration. Color combinations of the principal components, I-S-H transformation and 2/1 ratio have proved to be the best image enhancement techniques for geological studies in such areas. Lineament analysis has shown that the areas with known ore occurrence and the hydrothermally altered areas are closely associated with the higher photolineament factor values. Comparison of geophysical and remote sensing data has shown that there is a good correlation between the airborne geophysical and remote sensing data in the area.

  6. Multispectral metamaterial absorber.

    PubMed

    Grant, J; McCrindle, I J H; Li, C; Cumming, D R S

    2014-03-01

    We present the simulation, implementation, and measurement of a multispectral metamaterial absorber (MSMMA) and show that we can realize a simple absorber structure that operates in the mid-IR and terahertz (THz) bands. By embedding an IR metamaterial absorber layer into a standard THz metamaterial absorber stack, a narrowband resonance is induced at a wavelength of 4.3 μm. This resonance is in addition to the THz metamaterial absorption resonance at 109 μm (2.75 THz). We demonstrate the inherent scalability and versatility of our MSMMA by describing a second device whereby the MM-induced IR absorption peak frequency is tuned by varying the IR absorber geometry. Such a MSMMA could be coupled with a suitable sensor and formed into a focal plane array, enabling multispectral imaging.

  7. THE ACCURACY OF DIGITAL-VIDEO RETINAL IMAGING TO SCREEN FOR DIABETIC RETINOPATHY: AN ANALYSIS OF TWO DIGITAL-VIDEO RETINAL IMAGING SYSTEMS USING STANDARD STEREOSCOPIC SEVEN-FIELD PHOTOGRAPHY AND DILATED CLINICAL EXAMINATION AS REFERENCE STANDARDS

    PubMed Central

    Lawrence, Mary Gilbert

    2004-01-01

    ABSTRACT Purpose To evaluate the accuracy of two digital-video retinal imaging (DVRI) systems to detect diabetic retinopathy. Methods A prospective, masked, technology assessment was conducted for two DVRI systems at a tertiary care Veterans Affairs Medical Center. Group A (n = 151 patients) was imaged with a 640 × 480 resolution system and group B (n = 103 patients) with an 800 × 600 resolution system. Four retinal evaluations were performed on each patient: DVRI with undilated pupils using one imaging field (U-DVRI), DVRI with dilated pupils using three imaging fields (D-DVRI), dilated clinical examination, and Early Treatment Diabetic Retinopathy Study stereoscopic seven-field photography (ETDRS-P). Two analyses of accuracy were conducted, one using ETDRS-P as a “gold standard” (ETDRS-GS) and one using dilated clinical examination as a “gold standard” (C-GS). Results For group A, using the ETDRS-GS, sensitivities of U-DVRI and D-DVRI were 0.66 and 0.66; specificities of U-DVRI and D-DVRI were 0.66 and 0.86. Using the C-GS, sensitivities of U-DVRI and D-DVRI were 0.79 and 0.80; specificities of U-DVRI and D-DVRI were 0.68 and 0.85. For group B, using the ETDRS-GS, sensitivities of U-DVRI and D-DVRI were 0.76 and 0.85; specificities of U-DVRI and D-DVRI were 0.45 and 0.80. Using the C-GS, sensitivities of U-DVRI and D-DVRI were 0.81 and 0.87; specificities of U-DVRI and D-DVRI were 0.45 and 0.69. For both groups, dilation significantly improved specificities. Conclusions The 800 × 600 resolution DVRI system offers an accurate method of detecting diabetic retinopathy, provided there is adequate pupillary dilation and three retinal images are taken. DVRI technology may help facilitate retinal screenings of growing diabetic populations. PMID:15747766

  8. The Case of Design-Oriented Pedagogy: What Students' Digital Video Stories Say about Emerging Learning Ecosystems

    ERIC Educational Resources Information Center

    Anu, Liljeström; Jorma, Enkenberg; Sinikka, Pöllänen

    2014-01-01

    This paper presents a case study in which multi-age students (aged 6-12, N?=?32) in small groups made autonomous inquiries about the phenomenon of winter fishing within the framework of design-oriented pedagogy. The research analyzed storytelling videos that the students produced as learning objects. These videos revealed a picture of the…

  9. The Case of Design-Oriented Pedagogy: What Students' Digital Video Stories Say about Emerging Learning Ecosystems

    ERIC Educational Resources Information Center

    Anu, Liljeström; Jorma, Enkenberg; Sinikka, Pöllänen

    2014-01-01

    This paper presents a case study in which multi-age students (aged 6-12, N?=?32) in small groups made autonomous inquiries about the phenomenon of winter fishing within the framework of design-oriented pedagogy. The research analyzed storytelling videos that the students produced as learning objects. These videos revealed a picture of the…

  10. Polarimetric Multispectral Imaging Technology

    NASA Technical Reports Server (NTRS)

    Cheng, L.-J.; Chao, T.-H.; Dowdy, M.; Mahoney, C.; Reyes, G.

    1993-01-01

    The Jet Propulsion Laboratory is developing a remote sensing technology on which a new generation of compact, lightweight, high-resolution, low-power, reliable, versatile, programmable scientific polarimetric multispectral imaging instruments can be built to meet the challenge of future planetary exploration missions. The instrument is based on the fast programmable acousto-optic tunable filter (AOTF) of tellurium dioxide (TeO2) that operates in the wavelength range of 0.4-5 microns. Basically, the AOTF multispectral imaging instrument measures incoming light intensity as a function of spatial coordinates, wavelength, and polarization. Its operation can be in either sequential, random access, or multiwavelength mode as required. This provides observation flexibility, allowing real-time alternation among desired observations, collecting needed data only, minimizing data transmission, and permitting implementation of new experiments. These will result in optimization of the mission performance with minimal resources. Recently we completed a polarimetric multispectral imaging prototype instrument and performed outdoor field experiments for evaluating application potentials of the technology. We also investigated potential improvements on AOTF performance to strengthen technology readiness for applications. This paper will give a status report on the technology and a prospect toward future planetary exploration.

  11. Multispectral imaging system for contaminant detection

    NASA Technical Reports Server (NTRS)

    Poole, Gavin H. (Inventor)

    2003-01-01

    An automated inspection system for detecting digestive contaminants on food items as they are being processed for consumption includes a conveyor for transporting the food items, a light sealed enclosure which surrounds a portion of the conveyor, with a light source and a multispectral or hyperspectral digital imaging camera disposed within the enclosure. Operation of the conveyor, light source and camera are controlled by a central computer unit. Light reflected by the food items within the enclosure is detected in predetermined wavelength bands, and detected intensity values are analyzed to detect the presence of digestive contamination.

  12. One hundred case studies of Asia-Pacific telemedicine using a digital video transport system over a research and education network.

    PubMed

    Shimizu, Shuji; Nakashima, Naoki; Okamura, Koji; Tanaka, Masao

    2009-01-01

    Although the use of video in telemedicine is most helpful, the transmission of high-quality moving images is difficult in conventional systems due to the limitation of network bandwidth and the quality of service. We have established a new system via the academic broadband network that can preserve the original quality and assure smooth movement of the image. Here we report on 100 case studies and discuss the lessons we have learned. Kyushu University Hospital in Fukuoka, Japan, was linked to 53 medical institutions and meeting venues in 13 countries and regions over the Asia-Pacific Advanced Network, an international research and education consortium. The digital video transport system (DVTS), free software that transforms digital video signals directly into Internet Protocol, was installed on a personal computer (PC) with a network bandwidth of 30 Mbps per channel. Between February 2003 and June 2007, 100 telecommunication sessions were held, 94 of which were international and 6 domestic. Furthermore, 47 involved real-time demonstrations and 53 interactive teleconferences using video or PC presentations. Multiple stations were connected in 37 events, and the number of connected stations in total reached 269. The time delay was restricted to 0.3-1.0 seconds between the stations. Participants provided feedback via questionnaires, and with respect to image quality, 509 (68.3%) participants reported "very good," 206 (27.7%) reported "good," 19 (2.6%) reported "poor," and 11 (1.5%) reported "very poor." DVTS is both economical, with a minimal initial investment, and simple to set up, and this is the first time that this advanced system has been used so widely in the Asia-Pacific region. Because the high-speed academic network for research and education is available worldwide, we believe our cutting-edge technology will facilitate medical standardization beyond geographic borders in the world.

  13. Digital video display system

    NASA Technical Reports Server (NTRS)

    Zygielbaum, A. I.; Martin, W. L.; Engle, A.

    1973-01-01

    System displays image data in real time on 120,000-element raster scan with 2, 4, or 8 shades of grey. Designed for displaying planetary range Doppler data, system can be used for X-Y plotting, displaying alphanumerics, and providing image animation.

  14. Exploring the Use of Interactive Digital Storytelling Video: Promoting Student Engagement and Learning in a University Hybrid Course

    ERIC Educational Resources Information Center

    Shelton, Catharyn C.; Warren, Annie E.; Archambault, Leanna M.

    2016-01-01

    This study explores interactive digital storytelling in a university hybrid course. Digital stories leverage imagery and narrative-based content to explore concepts, while appealing to millennials. When digital storytelling is used as the main source of course content, tensions arise regarding how to engage and support student learning while…

  15. Computer-based video digitizer analysis of surface extension in maize roots: kinetics of growth rate changes during gravitropism

    NASA Technical Reports Server (NTRS)

    Ishikawa, H.; Hasenstein, K. H.; Evans, M. L.

    1991-01-01

    We used a video digitizer system to measure surface extension and curvature in gravistimulated primary roots of maize (Zea mays L.). Downward curvature began about 25 +/- 7 min after gravistimulation and resulted from a combination of enhanced growth along the upper surface and reduced growth along the lower surface relative to growth in vertically oriented controls. The roots curved at a rate of 1.4 +/- 0.5 degrees min-1 but the pattern of curvature varied somewhat. In about 35% of the samples the roots curved steadily downward and the rate of curvature slowed as the root neared 90 degrees. A final angle of about 90 degrees was reached 110 +/- 35 min after the start of gravistimulation. In about 65% of the samples there was a period of backward curvature (partial reversal of curvature) during the response. In some cases (about 15% of those showing a period of reverse bending) this period of backward curvature occurred before the root reached 90 degrees. Following transient backward curvature, downward curvature resumed and the root approached a final angle of about 90 degrees. In about 65% of the roots showing a period of reverse curvature, the roots curved steadily past the vertical, reaching maximum curvature about 205 +/- 65 min after gravistimulation. The direction of curvature then reversed back toward the vertical. After one or two oscillations about the vertical the roots obtained a vertical orientation and the distribution of growth within the root tip became the same as that prior to gravistimulation. The period of transient backward curvature coincided with and was evidently caused by enhancement of growth along the concave and inhibition of growth along the convex side of the curve, a pattern opposite to that prevailing in the earlier stages of downward curvature. There were periods during the gravitropic response when the normally unimodal growth-rate distribution within the elongation zone became bimodal with two peaks of rapid elongation separated by

  16. Computer-based video digitizer analysis of surface extension in maize roots: kinetics of growth rate changes during gravitropism

    NASA Technical Reports Server (NTRS)

    Ishikawa, H.; Hasenstein, K. H.; Evans, M. L.

    1991-01-01

    We used a video digitizer system to measure surface extension and curvature in gravistimulated primary roots of maize (Zea mays L.). Downward curvature began about 25 +/- 7 min after gravistimulation and resulted from a combination of enhanced growth along the upper surface and reduced growth along the lower surface relative to growth in vertically oriented controls. The roots curved at a rate of 1.4 +/- 0.5 degrees min-1 but the pattern of curvature varied somewhat. In about 35% of the samples the roots curved steadily downward and the rate of curvature slowed as the root neared 90 degrees. A final angle of about 90 degrees was reached 110 +/- 35 min after the start of gravistimulation. In about 65% of the samples there was a period of backward curvature (partial reversal of curvature) during the response. In some cases (about 15% of those showing a period of reverse bending) this period of backward curvature occurred before the root reached 90 degrees. Following transient backward curvature, downward curvature resumed and the root approached a final angle of about 90 degrees. In about 65% of the roots showing a period of reverse curvature, the roots curved steadily past the vertical, reaching maximum curvature about 205 +/- 65 min after gravistimulation. The direction of curvature then reversed back toward the vertical. After one or two oscillations about the vertical the roots obtained a vertical orientation and the distribution of growth within the root tip became the same as that prior to gravistimulation. The period of transient backward curvature coincided with and was evidently caused by enhancement of growth along the concave and inhibition of growth along the convex side of the curve, a pattern opposite to that prevailing in the earlier stages of downward curvature. There were periods during the gravitropic response when the normally unimodal growth-rate distribution within the elongation zone became bimodal with two peaks of rapid elongation separated by

  17. Multispectral thermal imaging

    SciTech Connect

    Weber, P.G.; Bender, S.C.; Borel, C.C.; Clodius, W.B.; Smith, B.W.; Garrett, A.; Pendergast, M.M.; Kay, R.R.

    1998-12-01

    Many remote sensing applications rely on imaging spectrometry. Here the authors use imaging spectrometry for thermal and multispectral signatures measured from a satellite platform enhanced with a combination of accurate calibrations and on-board data for correcting atmospheric distortions. The approach is supported by physics-based end-to-end modeling and analysis, which permits a cost-effective balance between various hardware and software aspects. The goal is to develop and demonstrate advanced technologies and analysis tools toward meeting the needs of the customer; at the same time, the attributes of this system can address other applications in such areas as environmental change, agriculture, and volcanology.

  18. MULTISPECTRAL THERMAL IMAGER - OVERVIEW

    SciTech Connect

    P. WEBER

    2001-03-01

    The Multispectral Thermal Imager satellite fills a new and important role in advancing the state of the art in remote sensing sciences. Initial results with the full calibration system operating indicate that the system was already close to achieving the very ambitious goals which we laid out in 1993, and we are confident of reaching all of these goals as we continue our research and improve our analyses. In addition to the DOE interests, the satellite is tasked about one-third of the time with requests from other users supporting research ranging from volcanology to atmospheric sciences.

  19. Video gaming and gender differences in digital and printed reading performance among 15-year-olds students in 26 countries.

    PubMed

    Borgonovi, Francesca

    2016-04-01

    Video games are a favorite leisure-time activity among teenagers worldwide. This study examines cross-national gender differences in reading achievement and video gaming and whether video gaming explains gender differences in reading achievement and differences in performance between paper-based and computer-based reading. We use data from a representative sample of 145,953 students from 26 countries who sat the PISA 2012 assessments and provided self-reports on use of video games. Although boys tend to have poorer results in both the computer-based and the paper-based reading assessments, boys' under achievement is smaller when the assessment is delivered on computer than when it is delivered on paper. Boys underperformance compared to girls in the two reading assessments is particularly pronounced among low-achieving students. Among both boys and girls moderate use of single-player games is associated with a performance advantage. However, frequent engagement with collaborative online games is generally associated with a steep reduction in achievement, particularly in the paper-based test and particularly among low-achieving students. Excessive gaming may hinder academic achievement, but moderate gaming can promote positive student outcomes. In many countries video gaming explains the difference in the gender gap in reading between the paper-based and the computer-based assessments.

  20. 47 CFR 25.212 - Narrowband analog transmissions, digital transmissions, and video transmissions in the GSO Fixed...

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... unacceptable levels of interference caused by other satellite networks shall be established on the basis of... digital SCPC using frequency division multiple access (FDMA) or time division multiple access (TDMA) technique, N is equal to one. For digital SCPC using code division multiple access (CDMA) technique, N...

  1. Does Digital Video Enhance Student Learning in Field-Based Experiments and Develop Graduate Attributes beyond the Classroom?

    ERIC Educational Resources Information Center

    Fuller, Ian C.; France, Derek

    2016-01-01

    The connection between fieldwork and development of graduate attributes is explored in this paper. Digital technologies present opportunities to potentially enhance the learning experience of students undertaking fieldwork, and develop core digital attributes and competencies required by Higher Education Institutions (HEIs) and employers. This…

  2. Does Digital Video Enhance Student Learning in Field-Based Experiments and Develop Graduate Attributes beyond the Classroom?

    ERIC Educational Resources Information Center

    Fuller, Ian C.; France, Derek

    2016-01-01

    The connection between fieldwork and development of graduate attributes is explored in this paper. Digital technologies present opportunities to potentially enhance the learning experience of students undertaking fieldwork, and develop core digital attributes and competencies required by Higher Education Institutions (HEIs) and employers. This…

  3. Multispectral imaging and image processing

    NASA Astrophysics Data System (ADS)

    Klein, Julie

    2014-02-01

    The color accuracy of conventional RGB cameras is not sufficient for many color-critical applications. One of these applications, namely the measurement of color defects in yarns, is why Prof. Til Aach and the Institute of Image Processing and Computer Vision (RWTH Aachen University, Germany) started off with multispectral imaging. The first acquisition device was a camera using a monochrome sensor and seven bandpass color filters positioned sequentially in front of it. The camera allowed sampling the visible wavelength range more accurately and reconstructing the spectra for each acquired image position. An overview will be given over several optical and imaging aspects of the multispectral camera that have been investigated. For instance, optical aberrations caused by filters and camera lens deteriorate the quality of captured multispectral images. The different aberrations were analyzed thoroughly and compensated based on models for the optical elements and the imaging chain by utilizing image processing. With this compensation, geometrical distortions disappear and sharpness is enhanced, without reducing the color accuracy of multispectral images. Strong foundations in multispectral imaging were laid and a fruitful cooperation was initiated with Prof. Bernhard Hill. Current research topics like stereo multispectral imaging and goniometric multispectral measure- ments that are further explored with his expertise will also be presented in this work.

  4. Writing in Video.

    ERIC Educational Resources Information Center

    Carraher, David; Nemirovsky, Ricardo; DiMattia, Cara; Lara-Meloy, Teresa; Earnest, Darrell

    1999-01-01

    Video and electronic media have the potential to bridge the gap between classroom research and practice by providing rich and detailed data for grounded discussions about teaching and learning. Describes attempts to use digital video technologies to increase collaboration between researchers and practitioners. (WRM)

  5. Multispectral Resource Sampler Workshop

    NASA Technical Reports Server (NTRS)

    1979-01-01

    The utility of the multispectral resource sampler (MRS) was examined by users in the following disciplines: agriculture, atmospheric studies, engineering, forestry, geology, hydrology/oceanography, land use, and rangelands/soils. Modifications to the sensor design were recommended and the desired types of products and number of scenes required per month were indicated. The history, design, capabilities, and limitations of the MRS are discussed as well as the multilinear spectral array technology which it uses. Designed for small area inventory, the MRS can provide increased temporal, spectral, and spatial resolution, facilitate polarization measurement and atmospheric correction, and test onboard data compression techniques. The advantages of using it along with the thematic mapper are considered.

  6. Multispectral imaging radar

    NASA Technical Reports Server (NTRS)

    Porcello, L. J.; Rendleman, R. A.

    1972-01-01

    A side-looking radar, installed in a C-46 aircraft, was modified to provide it with an initial multispectral imaging capability. The radar is capable of radiating at either of two wavelengths, these being approximately 3 cm and 30 cm, with either horizontal or vertical polarization on each wavelength. Both the horizontally- and vertically-polarized components of the reflected signal can be observed for each wavelength/polarization transmitter configuration. At present, two-wavelength observation of a terrain region can be accomplished within the same day, but not with truly simultaneous observation on both wavelengths. A multiplex circuit to permit this simultaneous observation has been designed. A brief description of the modified radar system and its operating parameters is presented. Emphasis is then placed on initial flight test data and preliminary interpretation. Some considerations pertinent to the calibration of such radars are presented in passing.

  7. Multispectral Microimager for Astrobiology

    NASA Technical Reports Server (NTRS)

    Sellar, R. Glenn; Farmer, Jack D.; Kieta, Andrew; Huang, Julie

    2006-01-01

    A primary goal of the astrobiology program is the search for fossil records. The astrobiology exploration strategy calls for the location and return of samples indicative of environments conducive to life, and that best capture and preserve biomarkers. Successfully returning samples from environments conducive to life requires two primary capabilities: (1) in situ mapping of the mineralogy in order to determine whether the desired minerals are present; and (2) nondestructive screening of samples for additional in-situ testing and/or selection for return to laboratories for more in-depth examination. Two of the most powerful identification techniques are micro-imaging and visible/infrared spectroscopy. The design and test results are presented from a compact rugged instrument that combines micro-imaging and spectroscopic capability to provide in-situ analysis, mapping, and sample screening capabilities. Accurate reflectance spectra should be a measure of reflectance as a function of wavelength only. Other compact multispectral microimagers use separate LEDs (light-emitting diodes) for each wavelength and therefore vary the angles of illumination when changing wavelengths. When observing a specularly-reflecting sample, this produces grossly inaccurate spectra due to the variation in the angle of illumination. An advanced design and test results are presented for a multispectral microimager which demonstrates two key advances relative to previous LED-based microimagers: (i) acquisition of actual reflectance spectra in which the flux is a function of wavelength only, rather than a function of both wavelength and illumination geometry; and (ii) increase in the number of spectral bands to eight bands covering a spectral range of 468 to 975 nm.

  8. Streaming Video--The Wave of the Video Future!

    ERIC Educational Resources Information Center

    Brown, Laura

    2004-01-01

    Videos and DVDs give the teachers more flexibility than slide projectors, filmstrips, and 16mm films but teachers and students are excited about a new technology called streaming. Streaming allows the educators to view videos on demand via the Internet, which works through the transfer of digital media like video, and voice data that is received…

  9. Streaming Video--The Wave of the Video Future!

    ERIC Educational Resources Information Center

    Brown, Laura

    2004-01-01

    Videos and DVDs give the teachers more flexibility than slide projectors, filmstrips, and 16mm films but teachers and students are excited about a new technology called streaming. Streaming allows the educators to view videos on demand via the Internet, which works through the transfer of digital media like video, and voice data that is received…

  10. MSS D Multispectral Scanner System

    NASA Technical Reports Server (NTRS)

    Lauletta, A. M.; Johnson, R. L.; Brinkman, K. L. (Principal Investigator)

    1982-01-01

    The development and acceptance testing of the 4-band Multispectral Scanners to be flown on LANDSAT D and LANDSAT D Earth resources satellites are summarized. Emphasis is placed on the acceptance test phase of the program. Test history and acceptance test algorithms are discussed. Trend data of all the key performance parameters are included and discussed separately for each of the two multispectral scanner instruments. Anomalies encountered and their resolutions are included.

  11. Magnetic Braking: A Video Analysis

    ERIC Educational Resources Information Center

    Molina-Bolivar, J. A.; Abella-Palacios, A. J.

    2012-01-01

    This paper presents a laboratory exercise that introduces students to the use of video analysis software and the Lenz's law demonstration. Digital techniques have proved to be very useful for the understanding of physical concepts. In particular, the availability of affordable digital video offers students the opportunity to actively engage in…

  12. Magnetic Braking: A Video Analysis

    ERIC Educational Resources Information Center

    Molina-Bolivar, J. A.; Abella-Palacios, A. J.

    2012-01-01

    This paper presents a laboratory exercise that introduces students to the use of video analysis software and the Lenz's law demonstration. Digital techniques have proved to be very useful for the understanding of physical concepts. In particular, the availability of affordable digital video offers students the opportunity to actively engage in…

  13. We All Stream for Video

    ERIC Educational Resources Information Center

    Technology & Learning, 2008

    2008-01-01

    More than ever, teachers are using digital video to enhance their lessons. In fact, the number of schools using video streaming increased from 30 percent to 45 percent between 2004 and 2006, according to Market Data Retrieval. Why the popularity? For starters, video-streaming products are easy to use. They allow teachers to punctuate lessons with…

  14. We All Stream for Video

    ERIC Educational Resources Information Center

    Technology & Learning, 2008

    2008-01-01

    More than ever, teachers are using digital video to enhance their lessons. In fact, the number of schools using video streaming increased from 30 percent to 45 percent between 2004 and 2006, according to Market Data Retrieval. Why the popularity? For starters, video-streaming products are easy to use. They allow teachers to punctuate lessons with…

  15. Skin chromphore mapping by means of a modified video-microscope for skin malformation diagnosis

    NASA Astrophysics Data System (ADS)

    Bekina, Amina; Rubins, Uldis; Lihacova, Ilze; Zaharans, Janis; Spigulis, Janis

    2013-09-01

    Many spectral imaging devices are commercially available and used to detect certain skin pathology; however an alternative cost-efficient device can provide an advanced spectral analisys of skin. Multispectral device for diagnosis of pigmented skin lesions was developed and tested. Possibilities to map skin chromophores using a modified low-cost digital video-microscope is discussed. It was adapted for an advanced skin microscopy and used for detailed spectral analysis of skin. The device comprises CMOS digital imaging sensor, four-colour LED illumination system and image acquisition optics. The main goal is to obtain a set of spectral images of the skin area of interest for further conversion into maps of the main skin chromophores.

  16. Analysis of simulated multispectral data from earth resources satellites

    NASA Technical Reports Server (NTRS)

    White, D. A.; Rouse, J. W., Jr.; Scheel, J. A.

    1971-01-01

    The validity of the applicability assumption was determined through the simulation of ERTS and Skylab data using available aircraft scanner systems. The research techniques compared aircraft multispectral scanner data obtained under nominal conditions at low altitudes. Maximum likelihood decision criteria algorithms implemented on a digital computer were used to classify training set data. Comparisons between percentages of correct classifications were made, along with implications as to the techniques of satellite analysis.

  17. Airborne system for testing multispectral reconnaissance technologies

    NASA Astrophysics Data System (ADS)

    Schmitt, Dirk-Roger; Doergeloh, Heinrich; Keil, Heiko; Wetjen, Wilfried

    1999-07-01

    There is an increasing demand for future airborne reconnaissance systems to obtain aerial images for tactical or peacekeeping operations. Especially Unmanned Aerial Vehicles (UAVs) equipped with multispectral sensor system and with real time jam resistant data transmission capabilities are of high interest. An airborne experimental platform has been developed as testbed to investigate different concepts of reconnaissance systems before their application in UAVs. It is based on a Dornier DO 228 aircraft, which is used as flying platform. Great care has been taken to achieve the possibility to test different kinds of multispectral sensors. Hence basically it is capable to be equipped with an IR sensor head, high resolution aerial cameras of the whole optical spectrum and radar systems. The onboard equipment further includes system for digital image processing, compression, coding, and storage. The data are RF transmitted to the ground station using technologies with high jam resistance. The images, after merging with enhanced vision components, are delivered to the observer who has an uplink data channel available to control flight and imaging parameters.

  18. Innovative Solution to Video Enhancement

    NASA Technical Reports Server (NTRS)

    2001-01-01

    Through a licensing agreement, Intergraph Government Solutions adapted a technology originally developed at NASA's Marshall Space Flight Center for enhanced video imaging by developing its Video Analyst(TM) System. Marshall's scientists developed the Video Image Stabilization and Registration (VISAR) technology to help FBI agents analyze video footage of the deadly 1996 Olympic Summer Games bombing in Atlanta, Georgia. VISAR technology enhanced nighttime videotapes made with hand-held camcorders, revealing important details about the explosion. Intergraph's Video Analyst System is a simple, effective, and affordable tool for video enhancement and analysis. The benefits associated with the Video Analyst System include support of full-resolution digital video, frame-by-frame analysis, and the ability to store analog video in digital format. Up to 12 hours of digital video can be stored and maintained for reliable footage analysis. The system also includes state-of-the-art features such as stabilization, image enhancement, and convolution to help improve the visibility of subjects in the video without altering underlying footage. Adaptable to many uses, Intergraph#s Video Analyst System meets the stringent demands of the law enforcement industry in the areas of surveillance, crime scene footage, sting operations, and dash-mounted video cameras.

  19. The Monster and Lover?Girl: Mapping Complex Relations in Preschool Children's Digital Video Productions

    ERIC Educational Resources Information Center

    McClure, Marissa

    2013-01-01

    In this article, I propose that research which focuses on young children's experiences with the interactivity of new media not only furthers findings about young children's digital lives but also enriches the conclusion that children's engagement with artmaking--in general and in traditional ways--is richly complex, affective, and…

  20. Miniature snapshot multispectral imager

    NASA Astrophysics Data System (ADS)

    Gupta, Neelam; Ashe, Philip R.; Tan, Songsheng

    2011-03-01

    We present a miniature snapshot multispectral imager based on using a monolithic filter array that operates in the short wavelength infrared spectral region and has a number of defense and commercial applications. The system is low-weight, portable with a miniature platform, and requires low power. The imager uses a 4×4 Fabry-Pérot filter array operating from 1487 to 1769 nm with a spectral bandpass ~10 nm. The design of the filters is based on using a shadow mask technique to fabricate an array of Fabry-Pérot etalons with two multilayer dielectric mirrors. The filter array is installed in a commercial handheld InGaAs camera, replacing the imaging lens with a custom designed 4×4 microlens assembly with telecentric imaging performance in each of the 16 subimaging channels. We imaged several indoor and outdoor scenes. The microlens assembly and filter design is quite flexible and can be tailored for any wavelength region from the ultraviolet to the longwave infrared, and the spectral bandpass can also be customized to meet sensing requirements. In this paper we discuss the design and characterization of the filter array, the microlens optical assembly, and imager and present imaging results.

  1. Multispectral Mapping of the Moon by Clementine

    NASA Technical Reports Server (NTRS)

    Eliason, Eric M.; McEwen, Alfred S.; Robinson, M.; Lucey, Paul G.; Duxbury, T.; Malaret, E.; Pieters, Carle; Becker, T.; Isbell, C.; Lee, E.

    1998-01-01

    One of the chief scientific objectives of the Clementine mission at the Moon was to acquire global multispectral mapping. A global digital map of the Moon in 11 spectral bandpasses and at a scale of 100 m/pixel is being produced at the U.S. Geological Survey in Flagstaff Arizona Near-global coverage was acquired with the UVVIS camera (central wavelengths of 415, 750, 900, 950, and 1000 nm) and the NIR camera (1102, 1248, 1499, 1996, 2620, and 2792 nary). We expect to complete processing of the UVVIS mosaics before the fall of 1998, and to complete the NIR mosaics a year later. The purpose of this poster is to provide an update on the processing and to show examples of the products or perhaps even a wall-sized display of color products from the UVVIS mosaics.

  2. A multispectral scanner survey of the Rocky Flats Environmental Technology Site and surrounding area, Golden, Colorado

    SciTech Connect

    Brewster, S.B. Jr.; Brickey, D.W.; Ross, S.L.; Shines, J.E.

    1997-04-01

    Aerial multispectral scanner imagery was collected of the Rocky Flats Environmental Technology Site in Golden, Colorado, on June 3, 5, 6, and 7, 1994, using a Daedalus AADS1268 multispectral scanner and coincident aerial color and color infrared photography. Flight altitudes were 4,500 feet (1372 meters) above ground level to match prior 1989 survey data; 2,000 feet (609 meters) above ground level for sitewide vegetation mapping; and 1,000 feet (304 meters) above ground level for selected areas of special interest. A multispectral survey was initiated to improve the existing vegetation classification map, to identify seeps and springs, and to generate ARC/INFO Geographic Information System compatible coverages of the vegetation and wetlands for the entire site including the buffer zone. The multispectral scanner imagery and coincident aerial photography were analyzed for the detection, identification, and mapping of vegetation and wetlands. The multispectral scanner data were processed digitally while the color and color infrared photography were manually photo-interpreted to define vegetation and wetlands. Several standard image enhancement techniques were applied to the multispectral scanner data to assist image interpretation. A seep enhancement was applied and a color composite consisting of multispectral scanner channels 11, 7, and 5 (thermal infrared, mid-infrared, and red bands, respectively) proved most useful for detecting seeps, seep zones, and springs. The predawn thermal infrared data were also useful in identifying and locating seeps. The remote sensing data, mapped wetlands, and ancillary Geographic Information System compatible data sets were spatially analyzed for seeps.

  3. Pathway — Using a State-of-the-Art Digital Video Database for Research and Development in Teacher Education

    NASA Astrophysics Data System (ADS)

    Adrian, Brian; Zollman, Dean; Stevens, Scott

    2006-02-01

    To demonstrate how state-of-the-art video databases can address issues related to the lack of preparation of many physics teachers, we have created the prototype Physics Teaching Web Advisory (Pathway). Pathway's Synthetic Interviews and related video materials are beginning to provide pre-service and out-of-field in-service teachers with much-needed professional development and well-prepared teachers with new perspectives on teaching physics. The prototype was limited to a demonstration of the systems. Now, with an additional grant we will extend the system and conduct research and evaluation on its effectiveness. This project will provide virtual expert help on issues of pedagogy and content. In particular, the system will convey, by example and explanation, contemporary ideas about the teaching of physics and applications of physics education research. The research effort will focus on the value of contemporary technology to address the continuing education of teachers who are teaching in a field in which they have not been trained.

  4. PC Based Video on Demand Trials.

    ERIC Educational Resources Information Center

    Branch, Philip; Durran, Jennifer

    Many educational institutions have a substantial personal computer (PC) network that can be adapted to provide digital video on demand, as well as PCs that can be used as video on demand clients. To gain insight into the issues involved in using this technology in an educational environment that relies heavily on video, a simple, low cost video on…

  5. Utilization of digital LANDSAT imagery for the study of granitoid bodies in Rondonia: Case example of the Pedra Branca massif

    NASA Technical Reports Server (NTRS)

    Parada, N. D. J. (Principal Investigator); Almeidafilho, R.; Payolla, B. L.; Depinho, O. G.; Bettencourt, J. S.

    1984-01-01

    Analysis of digital multispectral MSS-LANDSAT images enhanced through computer techniques and enlarged to a video scale of 1:100.000, show the main geological and structura features of the Pedra Branca granitic massif in Rondonia. These are not observed in aerial photographs or adar images. Field work shows that LANDSAT photogeological units correspond to different facies of granitic rocks in the Pedra Branca massif. Even under the particular characteristics of Amazonia (Tropical Forest, deep weathering, and Quaternary sedimentary covers), an adequate utilization of orbital remote sensing images can be important tools for the orientation of field works.

  6. Trophic classification of Colorado lakes utilizing contact data, Landsat and aircraft-acquired multispectral scanner data

    NASA Technical Reports Server (NTRS)

    Boland, D. H. P.; Blackwell, R. J.

    1978-01-01

    Multispectral scanner data, acquired over several Colorado lakes using Landsat-1 and aircraft, were used in conjunction with National Eutrophication Survey contact-sensed data to determine the feasibility of assessing lacustrine trophic levels. A trophic state index was developed using contact-sensed data for several trophic indicators (chlorophyll a, inverse of Secchi disk transparency, conductivity, total phosphorous, total organic nitrogen, algal assay yield). Relationships between the digitally processed multispectral scanner data, several trophic indicators, and the trophic index were examined using a supervised multispectral classification technique and regression techniques. Statistically significant correlations exist between spectral bands, several of the trophic indicators (chlorophyll a, Secchi disk transparency, total organic nitrogen), and the trophic state index. Color-coded photomaps were generated which depict the spectral aspects of trophic state. Multispectral scanner data acquired from satellite and aircraft platforms can be used to advantage in lake monitoring and survey programs.

  7. Computerized tomography using video recorded fluoroscopic images

    NASA Technical Reports Server (NTRS)

    Kak, A. C.; Jakowatz, C. V., Jr.; Baily, N. A.; Keller, R. A.

    1975-01-01

    A computerized tomographic imaging system is examined which employs video-recorded fluoroscopic images as input data. By hooking the video recorder to a digital computer through a suitable interface, such a system permits very rapid construction of tomograms.

  8. Multispectral imaging method and apparatus

    DOEpatents

    Sandison, David R.; Platzbecker, Mark R.; Vargo, Timothy D.; Lockhart, Randal R.; Descour, Michael R.; Richards-Kortum, Rebecca

    1999-01-01

    A multispectral imaging method and apparatus adapted for use in determining material properties, especially properties characteristic of abnormal non-dermal cells. A target is illuminated with a narrow band light beam. The target expresses light in response to the excitation. The expressed light is collected and the target's response at specific response wavelengths to specific excitation wavelengths is measured. From the measured multispectral response the target's properties can be determined. A sealed, remote probe and robust components can be used for cervical imaging

  9. Multispectral imaging method and apparatus

    DOEpatents

    Sandison, D.R.; Platzbecker, M.R.; Vargo, T.D.; Lockhart, R.R.; Descour, M.R.; Richards-Kortum, R.

    1999-07-06

    A multispectral imaging method and apparatus are described which are adapted for use in determining material properties, especially properties characteristic of abnormal non-dermal cells. A target is illuminated with a narrow band light beam. The target expresses light in response to the excitation. The expressed light is collected and the target's response at specific response wavelengths to specific excitation wavelengths is measured. From the measured multispectral response the target's properties can be determined. A sealed, remote probe and robust components can be used for cervical imaging. 5 figs.

  10. Video indirect ophthalmoscopy using a hand-held video camera.

    PubMed

    Shanmugam, Mahesh P

    2011-01-01

    Fundus photography in adults and cooperative children is possible with a fundus camera or by using a slit lamp-mounted digital camera. Retcam TM or a video indirect ophthalmoscope is necessary for fundus imaging in infants and young children under anesthesia. Herein, a technique of converting and using a digital video camera into a video indirect ophthalmoscope for fundus imaging is described. This device will allow anyone with a hand-held video camera to obtain fundus images. Limitations of this technique involve a learning curve and inability to perform scleral depression.

  11. Accelerating video carving from unallocated space

    NASA Astrophysics Data System (ADS)

    Kalva, Hari; Parikh, Anish; Srinivasan, Avinash

    2013-03-01

    Video carving has become an essential tool in digital forensics. Video carving enables recovery of deleted video files from hard disks. Processing data to extract videos is a computationally intensive task. In this paper we present two methods to accelerate video carving: a method to accelerate fragment extraction, and a method to accelerate combining of these fragments into video segments. Simulation results show that complexity of video fragment extraction can be reduced by as much as 75% with minimal impact on the videos recovered.

  12. High-fidelity video and still-image communication based on spectral information: natural vision system and its applications

    NASA Astrophysics Data System (ADS)

    Yamaguchi, Masahiro; Haneishi, Hideaki; Fukuda, Hiroyuki; Kishimoto, Junko; Kanazawa, Hiroshi; Tsuchida, Masaru; Iwama, Ryo; Ohyama, Nagaaki

    2006-01-01

    In addition to the great advancement of high-resolution and large-screen imaging technology, the issue of color is now receiving considerable attention as another aspect than the image resolution. It is difficult to reproduce the original color of subject in conventional imaging systems, and that obstructs the applications of visual communication systems in telemedicine, electronic commerce, and digital museum. To breakthrough the limitation of conventional RGB 3-primary systems, "Natural Vision" project aims at an innovative video and still-image communication technology with high-fidelity color reproduction capability, based on spectral information. This paper summarizes the results of NV project including the development of multispectral and multiprimary imaging technologies and the experimental investigations on the applications to medicine, digital archives, electronic commerce, and computer graphics.

  13. Advanced Multispectral Scanner (AMS) study. [aircraft remote sensing

    NASA Technical Reports Server (NTRS)

    1978-01-01

    The status of aircraft multispectral scanner technology was accessed in order to develop preliminary design specifications for an advanced instrument to be used for remote sensing data collection by aircraft in the 1980 time frame. The system designed provides a no-moving parts multispectral scanning capability through the exploitation of linear array charge coupled device technology and advanced electronic signal processing techniques. Major advantages include: 10:1 V/H rate capability; 120 deg FOV at V/H = 0.25 rad/sec; 1 to 2 rad resolution; high sensitivity; large dynamic range capability; geometric fidelity; roll compensation; modularity; long life; and 24 channel data acquisition capability. The field flattening techniques of the optical design allow wide field view to be achieved at fast f/nos for both the long and short wavelength regions. The digital signal averaging technique permits maximization of signal to noise performance over the entire V/H rate range.

  14. Real-time video-image analysis

    NASA Technical Reports Server (NTRS)

    Eskenazi, R.; Rayfield, M. J.; Yakimovsky, Y.

    1979-01-01

    Digitizer and storage system allow rapid random access to video data by computer. RAPID (random-access picture digitizer) uses two commercially-available, charge-injection, solid-state TV cameras as sensors. It can continuously update its memory with each frame of video signal, or it can hold given frame in memory. In either mode, it generates composite video output signal representing digitized image in memory.

  15. RGB-NIR multispectral camera.

    PubMed

    Chen, Zhenyue; Wang, Xia; Liang, Rongguang

    2014-03-10

    A multispectral imaging technique with a new CMOS camera is proposed. With a four channel Bayer patterns, the camera can acquire four spectral images simultaneously. We have developed a color correction process to obtain accurate color information, and we have also demonstrated its applications on portrait enhancement, shadow removal, and vein enhancement.

  16. A New Methodology for Studying Dynamics of Aerosol Particles in Sneeze and Cough Using a Digital High-Vision, High-Speed Video System and Vector Analyses

    PubMed Central

    Nishimura, Hidekazu; Sakata, Soichiro; Kaga, Akikazu

    2013-01-01

    Microbial pathogens of respiratory infectious diseases are often transmitted through particles in sneeze and cough. Therefore, understanding the particle movement is important for infection control. Images of a sneeze induced by nasal cavity stimulation by healthy adult volunteers, were taken by a digital high-vision, high-speed video system equipped with a computer system and treated as a research model. The obtained images were enhanced electronically, converted to digital images every 1/300 s, and subjected to vector analysis of the bioparticles contained in the whole sneeze cloud using automatic image processing software. The initial velocity of the particles or their clusters in the sneeze was greater than 6 m/s, but decreased as the particles moved forward; the momentums of the particles seemed to be lost by 0.15–0.20 s and started a diffusion movement. An approximate equation of a function of elapsed time for their velocity was obtained from the vector analysis to represent the dynamics of the front-line particles. This methodology was also applied for a cough. Microclouds contained in a smoke exhaled with a voluntary cough by a volunteer after smoking one breath of cigarette, were traced as the visible, aerodynamic surrogates for invisible bioparticles of cough. The smoke cough microclouds had an initial velocity greater than 5 m/s. The fastest microclouds were located at the forefront of cloud mass that moving forward; however, their velocity clearly decreased after 0.05 s and they began to diffuse in the environmental airflow. The maximum direct reaches of the particles and microclouds driven by sneezing and coughing unaffected by environmental airflows were estimated by calculations using the obtained equations to be about 84 cm and 30 cm from the mouth, respectively, both achieved in about 0.2 s, suggesting that data relating to the dynamics of sneeze and cough became available by calculation. PMID:24312206

  17. Analyzing the Dynamics and Morphology of Cast-off Pattern at Different Speed Levels Using High-speed Digital Video Imaging.

    PubMed

    Kunz, Sebastian Niko; Adamec, Jiri; Grove, Christina

    2017-03-01

    During a bloodstain pattern analysis, one of the essential tasks is to distinguish between different kinds of applied forces as well as to estimate their level of intensity. In this study, high-speed digital imaging has been used to analyze the formation of cast-off patterns generated by a simulated backswing with a blood-bearing object. For this purpose, 0.5 mL blood was applied evenly over the last 5 cm of a blade simulant. Bloodstains were created through the controlled acceleration of a backswing at different speed levels between 1.1 m/sec and 3.8 m/sec. The flight dynamics of blood droplets were captured with an Olympus(®) i-Speed 3 high-speed digital camera with a Nikon(®) AF Nikkor 50 mm f/1.8 D lens and analyzed using the Olympus i-Speed 3 Viewer software. The video analysis showed that, during the backswing, blood droplets would move toward the lower end of the knifepoint and would be tangentially thrown off. These droplets impacted on the horizontal surface according to the arc of the swing. An increase in velocity led to longer cast-off patterns with distinct morphological characteristics. Under laboratory conditions, bloodstain pattern analysis allows certain conclusions about the intensity of a backswing and provides instructions on the position of the offender. However, due to the number of unknown variables at a crime scene, such interpretation of cast-off patterns is extremely limited and should be performed with extreme caution.

  18. A new methodology for studying dynamics of aerosol particles in sneeze and cough using a digital high-vision, high-speed video system and vector analyses.

    PubMed

    Nishimura, Hidekazu; Sakata, Soichiro; Kaga, Akikazu

    2013-01-01

    Microbial pathogens of respiratory infectious diseases are often transmitted through particles in sneeze and cough. Therefore, understanding the particle movement is important for infection control. Images of a sneeze induced by nasal cavity stimulation by healthy adult volunteers, were taken by a digital high-vision, high-speed video system equipped with a computer system and treated as a research model. The obtained images were enhanced electronically, converted to digital images every 1/300 s, and subjected to vector analysis of the bioparticles contained in the whole sneeze cloud using automatic image processing software. The initial velocity of the particles or their clusters in the sneeze was greater than 6 m/s, but decreased as the particles moved forward; the momentums of the particles seemed to be lost by 0.15-0.20 s and started a diffusion movement. An approximate equation of a function of elapsed time for their velocity was obtained from the vector analysis to represent the dynamics of the front-line particles. This methodology was also applied for a cough. Microclouds contained in a smoke exhaled with a voluntary cough by a volunteer after smoking one breath of cigarette, were traced as the visible, aerodynamic surrogates for invisible bioparticles of cough. The smoke cough microclouds had an initial velocity greater than 5 m/s. The fastest microclouds were located at the forefront of cloud mass that moving forward; however, their velocity clearly decreased after 0.05 s and they began to diffuse in the environmental airflow. The maximum direct reaches of the particles and microclouds driven by sneezing and coughing unaffected by environmental airflows were estimated by calculations using the obtained equations to be about 84 cm and 30 cm from the mouth, respectively, both achieved in about 0.2 s, suggesting that data relating to the dynamics of sneeze and cough became available by calculation.

  19. Multispectral filter array design without training images

    NASA Astrophysics Data System (ADS)

    Shinoda, Kazuma; Yanagi, Yudai; Hayasaki, Yoshio; Hasegawa, Madoka

    2017-08-01

    Multispectral images (MSIs) have been studied for many applications; however, limitations persist in techniques to capture them due to the complexity of assembling one or more prisms and multiple sensor arrays in order to detect signals. Inspired by the application of color filter arrays to commercial digital RGB cameras, a number of researchers have studied multispectral filter arrays (MSFAs) to solve this problem. Determining the measurement wavelength and pattern of an MSFA is important for improving the quality of the demosaicked image. Some conventional studies for designing MSFAs have used training data and have optimized the measurement wavelengths and the pattern by iteratively minimizing the error between the training data and the demosaicked images. We propose a metric to evaluate an MSFA without MSIs, and optimize the measurement wavelengths and the pattern of the MSFA by minimizing the metric. The proposed metric measures the sampling distance between filters in a spatial-spectral domain and quantifies the dispersion of the sampling points by average nearest-neighbor distance (ANND) under a given arbitrary MSFA. Since the quality of the demosaicked image is assumed to be proportional to the degree of dispersion of the sampling points in the spatial-spectral domain, we optimize the MSFA by minimizing the ANND in a nested simulated annealing process. Experimental results show that the optimized MSFA obtained using our method attained a higher peak signal-to-noise ratio (PSNR) than conventional untrained MSFAs in many cases. In addition, the performance difference between some trained MSFAs and the proposed MSFA was small. We also confirmed the validity of the proposed ANND by a comparison with the mean square error obtained from MSI datasets.

  20. Multispectral filter array design without training images

    NASA Astrophysics Data System (ADS)

    Shinoda, Kazuma; Yanagi, Yudai; Hayasaki, Yoshio; Hasegawa, Madoka

    2017-06-01

    Multispectral images (MSIs) have been studied for many applications; however, limitations persist in techniques to capture them due to the complexity of assembling one or more prisms and multiple sensor arrays in order to detect signals. Inspired by the application of color filter arrays to commercial digital RGB cameras, a number of researchers have studied multispectral filter arrays (MSFAs) to solve this problem. Determining the measurement wavelength and pattern of an MSFA is important for improving the quality of the demosaicked image. Some conventional studies for designing MSFAs have used training data and have optimized the measurement wavelengths and the pattern by iteratively minimizing the error between the training data and the demosaicked images. We propose a metric to evaluate an MSFA without MSIs, and optimize the measurement wavelengths and the pattern of the MSFA by minimizing the metric. The proposed metric measures the sampling distance between filters in a spatial-spectral domain and quantifies the dispersion of the sampling points by average nearest-neighbor distance (ANND) under a given arbitrary MSFA. Since the quality of the demosaicked image is assumed to be proportional to the degree of dispersion of the sampling points in the spatial-spectral domain, we optimize the MSFA by minimizing the ANND in a nested simulated annealing process. Experimental results show that the optimized MSFA obtained using our method attained a higher peak signal-to-noise ratio (PSNR) than conventional untrained MSFAs in many cases. In addition, the performance difference between some trained MSFAs and the proposed MSFA was small. We also confirmed the validity of the proposed ANND by a comparison with the mean square error obtained from MSI datasets.

  1. Analysis of growth patterns during gravitropic curvature in roots of Zea mays by use of a computer-based video digitizer

    NASA Technical Reports Server (NTRS)

    Nelson, A. J.; Evans, M. L.

    1986-01-01

    A computer-based video digitizer system is described which allows automated tracking of markers placed on a plant surface. The system uses customized software to calculate relative growth rates at selected positions along the plant surface and to determine rates of gravitropic curvature based on the changing pattern of distribution of the surface markers. The system was used to study the time course of gravitropic curvature and changes in relative growth rate along the upper and lower surface of horizontally-oriented roots of maize (Zea mays L.). The growing region of the root was found to extend from about 1 mm behind the tip to approximately 6 mm behind the tip. In vertically-oriented roots the relative growth rate was maximal at about 2.5 mm behind the tip and declined smoothly on either side of the maximum. Curvature was initiated approximately 30 min after horizontal orientation with maximal (50 degrees) curvature being attained in 3 h. Analysis of surface extension patterns during the response indicated that curvature results from a reduction in growth rate along both the upper and lower surfaces with stronger reduction along the lower surface.

  2. Analysis of growth patterns during gravitropic curvature in roots of Zea mays by use of a computer-based video digitizer

    NASA Technical Reports Server (NTRS)

    Nelson, A. J.; Evans, M. L.

    1986-01-01

    A computer-based video digitizer system is described which allows automated tracking of markers placed on a plant surface. The system uses customized software to calculate relative growth rates at selected positions along the plant surface and to determine rates of gravitropic curvature based on the changing pattern of distribution of the surface markers. The system was used to study the time course of gravitropic curvature and changes in relative growth rate along the upper and lower surface of horizontally-oriented roots of maize (Zea mays L.). The growing region of the root was found to extend from about 1 mm behind the tip to approximately 6 mm behind the tip. In vertically-oriented roots the relative growth rate was maximal at about 2.5 mm behind the tip and declined smoothly on either side of the maximum. Curvature was initiated approximately 30 min after horizontal orientation with maximal (50 degrees) curvature being attained in 3 h. Analysis of surface extension patterns during the response indicated that curvature results from a reduction in growth rate along both the upper and lower surfaces with stronger reduction along the lower surface.

  3. Conversations over Video Conferences: An Evaluation of the Spoken Aspects of Video-Mediated Communication.

    ERIC Educational Resources Information Center

    O'Conaill, Brid; And Others

    1993-01-01

    Considers reasons for the lack of acceptance of video communication; examines differences between spoken characteristics of video-mediated communication and face-to-face interaction; and evaluates two video communication systems in the United Kingdom, an Integrated Services Digital Network and LIVE-NET (London Interactive Video Education Network).…

  4. Desktop Video Productions. ICEM Guidelines Publications No. 6.

    ERIC Educational Resources Information Center

    Taufour, P. A.

    Desktop video consists of integrating the processing of the video signal in a microcomputer. This definition implies that desktop video can take multiple forms such as virtual editing or digital video. Desktop video, which does not imply any particular technology, has been approached in different ways in different technical fields. It remains a…

  5. Active modulation of laser coded systems using near infrared video projection system based on digital micromirror device (DMD)

    NASA Astrophysics Data System (ADS)

    Khalifa, Aly A.; Aly, Hussein A.; El-Sherif, Ashraf F.

    2016-02-01

    Near infrared (NIR) dynamic scene projection systems are used to perform hardware in-the-loop (HWIL) testing of a unit under test operating in the NIR band. The common and complex requirement of a class of these units is a dynamic scene that is spatio-temporal variant. In this paper we apply and investigate active external modulation of NIR laser in different ranges of temporal frequencies. We use digital micromirror devices (DMDs) integrated as the core of a NIR projection system to generate these dynamic scenes. We deploy the spatial pattern to the DMD controller to simultaneously yield the required amplitude by pulse width modulation (PWM) of the mirror elements as well as the spatio-temporal pattern. Desired modulation and coding of high stable, high power visible (Red laser at 640 nm) and NIR (Diode laser at 976 nm) using the combination of different optical masks based on DMD were achieved. These spatial versatile active coding strategies for both low and high frequencies in the range of kHz for irradiance of different targets were generated by our system and recorded using VIS-NIR fast cameras. The temporally-modulated laser pulse traces were measured using array of fast response photodetectors. Finally using a high resolution spectrometer, we evaluated the NIR dynamic scene projection system response in terms of preserving the wavelength and band spread of the NIR source after projection.

  6. Interventional video tomography

    NASA Astrophysics Data System (ADS)

    Truppe, Michael J.; Pongracz, Ferenc; Ploder, Oliver; Wagner, Arne; Ewers, Rolf

    1995-05-01

    Interventional Video Tomography (IVT) is a new imaging modality for Image Directed Surgery to visualize in real-time intraoperatively the spatial position of surgical instruments relative to the patient's anatomy. The video imaging detector is based on a special camera equipped with an optical viewing and lighting system and electronic 3D sensors. When combined with an endoscope it is used for examining the inside of cavities or hollow organs of the body from many different angles. The surface topography of objects is reconstructed from a sequence of monocular video or endoscopic images. To increase accuracy and speed of the reconstruction the relative movement between objects and endoscope is continuously tracked by electronic sensors. The IVT image sequence represents a 4D data set in stereotactic space and contains image, surface topography and motion data. In ENT surgery an IVT image sequence of the planned and so far accessible surgical path is acquired prior to surgery. To simulate the surgical procedure the cross sectional imaging data is superimposed with the digitally stored IVT image sequence. During surgery the video sequence component of the IVT simulation is substituted by the live video source. The IVT technology makes obsolete the use of 3D digitizing probes for the patient image coordinate transformation. The image fusion of medical imaging data with live video sources is the first practical use of augmented reality in medicine. During surgery a head-up display is used to overlay real-time reformatted cross sectional imaging data with the live video image.

  7. Feasibility of low-dose digital pulsed video-fluoroscopic swallow exams (VFSE): effects on radiation dose and image quality.

    PubMed

    Weiss, Jakob; Notohamiprodjo, Mike; Neumaier, Klement; Li, Minglun; Flatz, Wilhelm; Nikolaou, Konstantin; Pomschar, Andreas

    2017-09-01

    Background Fluoroscopy is a frequently used examination in clinical routine without appropriate research evaluation latest hardware and software equipment. Purpose To evaluate the feasibility of low-dose pulsed video-fluoroscopic swallowing exams (pVFSE) to reduce dose exposure in patients with swallowing disorders compared to high-resolution radiograph examinations (hrVFSE) serving as standard of reference. Material and Methods A phantom study (Alderson-Rando Phantom, 60 thermoluminescent dosimeters [TLD]) was performed for dose measurements. Acquisition parameters were as follows: (i) pVFSE: 76.7 kV, 57 mA, 0.9 Cu mm, pulse rate/s 30; (ii) hrVFSE: 68.0 kV, 362 mA, 0.2 Cu mm, pictures 30/s. The dose area product (DAP) indicated by the detector system and the radiation dose derived from the TLD measurements were analyzed. In a patient study, image quality was assessed qualitatively (5-point Likert scale, 5 = hrVFSE; two independent readers) and quantitatively (SNR) in 35 patients who subsequently underwent contrast-enhanced pVFSE and hrVFSE. Results Phantom measurements showed a dose reduction per picture of factor 25 for pVFSE versus hrVFSE images (0.0025 mGy versus 0.062 mGy). The DAP (µGym(2)) was 28.0 versus 810.5 (pVFSE versus hrVFSE) for an average examination time of 30 s. Direct and scattered organ doses were significantly lower for pVFSE as compared to hrVFSE ( P < 0.05). Image quality was rated 3.9 ± 0.5 for pVFSE versus the hrVFSE standard; depiction of the contrast agent 4.8 ± 0.3; noise 3.6 ± 0.5 ( P < 0.05); SNR calculations revealed a relative decreased of 43.9% for pVFSE as compared to hrVFSE. Conclusion Pulsed VFSE is feasible, providing diagnostic image quality at a significant dose reduction as compared to hrVFSE.

  8. [Video documentation in forensic practice].

    PubMed

    Schyma, C; Schyma, P

    1995-01-01

    The authors report in part 1 about their experiences with the Canon Ex1 Hi camcorder and the possibilities of documentation with the modern video technique. Application examples in legal medicine and criminalistics are described autopsy, scene, reconstruction of crimes etc. The online video documentation of microscopic sessions makes the discussion of findings easier. The use of video films for instruction produces a good resonance. The use of the video documentation can be extended by digitizing (Part 2). Two frame grabbers are presented, with which we obtained good results in digitizing of images captured from video. The best quality of images is achieved by online use of an image analysis chain. Corel 5.0 and PicEd Cora 4.0 allow complete image processings and analysis. The digital image processing influences the objectivity of the documentation. The applicabilities of image libraries are discussed.

  9. Magnetic Braking: A Video Analysis

    NASA Astrophysics Data System (ADS)

    Molina-Bolívar, J. A.; Abella-Palacios, A. J.

    2012-10-01

    This paper presents a laboratory exercise that introduces students to the use of video analysis software and the Lenz's law demonstration. Digital techniques have proved to be very useful for the understanding of physical concepts. In particular, the availability of affordable digital video offers students the opportunity to actively engage in kinematics in introductory-level physics.1,2 By using digital videos frame advance features and "marking" the position of a moving object in each frame, students are able to more precisely determine the position of an object at much smaller time increments than would be possible with common time devices. Once the student collects data consisting of positions and times, these values may be manipulated to determine velocity and acceleration. There are a variety of commercial and free applications that can be used for video analysis. Because the relevant technology has become inexpensive, video analysis has become a prevalent tool in introductory physics courses.

  10. A video event trigger for high frame rate, high resolution video technology

    NASA Technical Reports Server (NTRS)

    Williams, Glenn L.

    1991-01-01

    When video replaces film the digitized video data accumulates very rapidly, leading to a difficult and costly data storage problem. One solution exists for cases when the video images represent continuously repetitive 'static scenes' containing negligible activity, occasionally interrupted by short events of interest. Minutes or hours of redundant video frames can be ignored, and not stored, until activity begins. A new, highly parallel digital state machine generates a digital trigger signal at the onset of a video event. High capacity random access memory storage coupled with newly available fuzzy logic devices permits the monitoring of a video image stream for long term or short term changes caused by spatial translation, dilation, appearance, disappearance, or color change in a video object. Pretrigger and post-trigger storage techniques are then adaptable for archiving the digital stream from only the significant video images.

  11. Personal video manager: managing and mining home video collections

    NASA Astrophysics Data System (ADS)

    Wu, Peng; Obrador, Pere

    2005-07-01

    Home video collections constitute an important source of content to be experienced within the digital entertainment context. To make such content easy to access and reuse, various video analysis technologies have been researched and developed to extract video assets for management tasks, including video shot/scene detection, keyframe extraction, and video skimming/summarization. However, one less addressed issue is to investigate how useful those assets are in helping consumers managing their video collections and the usage pattern of the assets. In this paper, we present Personal Video Manager, both as a home video management system and an explorative research platform to enable a systematic analysis and understanding of consumers" demand on video assets and video processing technologies. For understanding consumer"s interest, PVM adopts database management technologies to model and archive how consumers identify video assets and utilize them for management tasks. The PVM mining engine performs data mining on such archived data to mine useful knowledge of consumer"s preference on video assets and behavior on utilizing the assets. As revealed in the experiment, consumer's interaction embeds rich information to be leveraged in developing more effective video analysis technologies.

  12. Multispectral Analysis of NMR Imagery

    NASA Technical Reports Server (NTRS)

    Butterfield, R. L.; Vannier, M. W. And Associates; Jordan, D.

    1985-01-01

    Conference paper discusses initial efforts to adapt multispectral satellite-image analysis to nuclear magnetic resonance (NMR) scans of human body. Flexibility of these techniques makes it possible to present NMR data in variety of formats, including pseudocolor composite images of pathological internal features. Techniques do not have to be greatly modified from form in which used to produce satellite maps of such Earth features as water, rock, or foliage.

  13. Multispectral Analysis of NMR Imagery

    NASA Technical Reports Server (NTRS)

    Butterfield, R. L.; Vannier, M. W. And Associates; Jordan, D.

    1985-01-01

    Conference paper discusses initial efforts to adapt multispectral satellite-image analysis to nuclear magnetic resonance (NMR) scans of human body. Flexibility of these techniques makes it possible to present NMR data in variety of formats, including pseudocolor composite images of pathological internal features. Techniques do not have to be greatly modified from form in which used to produce satellite maps of such Earth features as water, rock, or foliage.

  14. Video Cases. [SITE 2002 Section].

    ERIC Educational Resources Information Center

    Talley, Sue, Ed.

    This document contains the following papers on video case studies from the SITE (Society for Information Technology & Teacher Education) 2002 conference: (1) "Developing Digital Video Resources To Improve Teaching with Technology: The PT3--'Best Practices' Project"; (2) "Portraits of Three Schools from the U.S.A. Exemplary Technology-Supported…

  15. Encrypted IP video communication system

    NASA Astrophysics Data System (ADS)

    Bogdan, Apetrechioaie; Luminiţa, Mateescu

    2010-11-01

    Digital video transmission is a permanent subject of development, research and improvement. This field of research has an exponentially growing market in civil, surveillance, security and military aplications. A lot of solutions: FPGA, ASIC, DSP have been used for this purpose. The paper presents the implementation of an encrypted, IP based, video communication system having a competitive performance/cost ratio .

  16. High resolution multispectral photogrammetric imagery: enhancement, interpretation and evaluations

    NASA Astrophysics Data System (ADS)

    Roberts, Arthur; Haefele, Martin; Bostater, Charles; Becker, Thomas

    2007-10-01

    A variety of aerial mapping cameras were adapted and developed into simulated multiband digital photogrammetric mapping systems. Direct digital multispectral, two multiband cameras (IIS 4 band and Itek 9 band) and paired mapping and reconnaissance cameras were evaluated for digital spectral performance and photogrammetric mapping accuracy in an aquatic environment. Aerial films (24cm X 24cm format) tested were: Agfa color negative and extended red (visible and near infrared) panchromatic, and; Kodak color infrared and B&W (visible and near infrared) infrared. All films were negative processed to published standards and digitally converted at either 16 (color) or 10 (B&W) microns. Excellent precision in the digital conversions was obtained with scanning errors of less than one micron. Radiometric data conversion was undertaken using linear density conversion and centered 8 bit histogram exposure. This resulted in multiple 8 bit spectral image bands that were unaltered (not radiometrically enhanced) "optical count" conversions of film density. This provided the best film density conversion to a digital product while retaining the original film density characteristics. Data covering water depth, water quality, surface roughness, and bottom substrate were acquired using different measurement techniques as well as different techniques to locate sampling points on the imagery. Despite extensive efforts to obtain accurate ground truth data location errors, measurement errors, and variations in the correlation between water depth and remotely sensed signal persisted. These errors must be considered endemic and may not be removed through even the most elaborate sampling set up. Results indicate that multispectral photogrammetric systems offer improved feature mapping capability.

  17. Multispectral Analysis of Indigenous Rock Art Using Terrestrial Laser Scanning

    NASA Astrophysics Data System (ADS)

    Skoog, B.; Helmholz, P.; Belton, D.

    2016-06-01

    Multispectral analysis is a widely used technique in the photogrammetric and remote sensing industry. The use of Terrestrial Laser Scanning (TLS) in combination with imagery is becoming increasingly common, with its applications spreading to a wider range of fields. Both systems benefit from being a non-contact technique that can be used to accurately capture data regarding the target surface. Although multispectral analysis is actively performed within the spatial sciences field, its extent of application within an archaeological context has been limited. This study effectively aims to apply the multispectral techniques commonly used, to a remote Indigenous site that contains an extensive gallery of aging rock art. The ultimate goal for this research is the development of a systematic procedure that could be applied to numerous similar sites for the purpose of heritage preservation and research. The study consisted of extensive data capture of the rock art gallery using two different TLS systems and a digital SLR camera. The data was combined into a common 2D reference frame that allowed for standard image processing to be applied. An unsupervised k-means classifier was applied to the multiband images to detect the different types of rock art present. The result was unsatisfactory as the subsequent classification accuracy was relatively low. The procedure and technique does however show potential and further testing with different classification algorithms could possibly improve the result significantly.

  18. An LED-based lighting system for acquiring multispectral scenes

    NASA Astrophysics Data System (ADS)

    Parmar, Manu; Lansel, Steven; Farrell, Joyce

    2012-01-01

    The availability of multispectral scene data makes it possible to simulate a complete imaging pipeline for digital cameras, beginning with a physically accurate radiometric description of the original scene followed by optical transformations to irradiance signals, models for sensor transduction, and image processing for display. Certain scenes with animate subjects, e.g., humans, pets, etc., are of particular interest to consumer camera manufacturers because of their ubiquity in common images, and the importance of maintaining colorimetric fidelity for skin. Typical multispectral acquisition methods rely on techniques that use multiple acquisitions of a scene with a number of different optical filters or illuminants. Such schemes require long acquisition times and are best suited for static scenes. In scenes where animate objects are present, movement leads to problems with registration and methods with shorter acquisition times are needed. To address the need for shorter image acquisition times, we developed a multispectral imaging system that captures multiple acquisitions during a rapid sequence of differently colored LED lights. In this paper, we describe the design of the LED-based lighting system and report results of our experiments capturing scenes with human subjects.

  19. The Land Analysis System (LAS) for multispectral image processing

    USGS Publications Warehouse

    Wharton, S. W.; Lu, Y. C.; Quirk, Bruce K.; Oleson, Lyndon R.; Newcomer, J. A.; Irani, Frederick M.

    1988-01-01

    The Land Analysis System (LAS) is an interactive software system available in the public domain for the analysis, display, and management of multispectral and other digital image data. LAS provides over 240 applications functions and utilities, a flexible user interface, complete online and hard-copy documentation, extensive image-data file management, reformatting, conversion utilities, and high-level device independent access to image display hardware. The authors summarize the capabilities of the current release of LAS (version 4.0) and discuss plans for future development. Particular emphasis is given to the issue of system portability and the importance of removing and/or isolating hardware and software dependencies.

  20. Processing of multispectral thermal IR data for geologic applications

    NASA Technical Reports Server (NTRS)

    Kahle, A. B.; Madura, D. P.; Soha, J. M.

    1979-01-01

    Multispectral thermal IR data were acquired with a 24-channel scanner flown in an aircraft over the E. Tintic Utah mining district. These digital image data required extensive computer processing in order to put the information into a format useful for a geologic photointerpreter. Simple enhancement procedures were not sufficient to reveal the total information content because the data were highly correlated in all channels. The data were shown to be dominated by temperature variations across the scene, while the much more subtle spectral variations between the different rock types were of interest. The image processing techniques employed to analyze these data are described.