Topic
Videoconferencing
About: Videoconferencing is a research topic. Over the lifetime, 5364 publications have been published within this topic receiving 78029 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: It is shown that the long-range dependence property allows us to clearly distinguish between measured data and traffic generated by VBR source models currently used in the literature, and gives rise to novel and challenging problems in traffic engineering for high-speed networks.
Abstract: We analyze 20 large sets of actual variable-bit-rate (VBR) video data, generated by a variety of different codecs and representing a wide range of different scenes. Performing extensive statistical and graphical tests, our main conclusion is that long-range dependence is an inherent feature of VBR video traffic, i.e., a feature that is independent of scene (e.g., video phone, video conference, motion picture video) and codec. In particular, we show that the long-range dependence property allows us to clearly distinguish between our measured data and traffic generated by VBR source models currently used in the literature. These findings give rise to novel and challenging problems in traffic engineering for high-speed networks and open up new areas of research in queueing and performance analysis involving long-range dependent traffic models. A small number of analytic queueing results already exist, and we discuss their implications for network design and network control strategies in the presence of long-range dependent traffic. >
1,216 citations
Patent•
03 Jun 2002
TL;DR: In this article, a digital rights manager for enforcing a set of externally supplied restrictions associated with the received audio and/or video data is incorporated, with a cryptographic processor for selectively cryptoprocessing audio and video data in dependence on said rights manager being provided to limit access to the audio and or video data content.
Abstract: An intelligent media device, comprising a packet data communications interface; a media communication interface for receiving audio and/or video data; a digital memory for persistently storing received audio and/or video data; and an intelligent server for generating a virtual interface for controlling the media communication interface and the digital memory through said packet data communications interface. The intelligent server may be adaptive. A variety of devices may be interfaced through the packet data communications interface, including telephony, imaging, videoconferencing, security, alarm, environmental control, vehicular, illumination system, domestic appliance; fluid and handling systems, as well as consumer electronic devices. A digital rights manager for enforcing a set of externally supplied restrictions associated with the received audio and/or video data may be incorporated, with a cryptographic processor for selectively cryptoprocessing audio and/or video data in dependence on said rights manager being provided to limit access to the audio and/or video data content.
781 citations
TL;DR: The feasibility and acceptability of using Zoom to collect qualitative interview data within a health research context is explored in order to better understand its suitability for qualitative and mixed-methods researchers.
Abstract: Advances in communication technologies offer new opportunities for the conduct of qualitative research. Among these, Zoom—an innovative videoconferencing platform—has a number of unique features th...
766 citations
PARC1
735 citations
Book•
26 Jan 2014
TL;DR: An introduction to the algorithms and architectures that form the underpinnings of the image and video compressions standards, including JPEG, H.261 and H.263, while fully addressing the architecturalconsiderations involved when implementing these standards.
Abstract: From the Publisher:
Image and Video Compression Standards: Algorithms and Architectures, Second Edition presents an introduction to thealgorithms and architectures that form the underpinnings of the imageand video compressions standards, including JPEG (compression ofstill-images), H.261 and H.263 (video teleconferencing), and MPEG-1and MPEG-2 (video storage and broadcasting). The next generation ofaudiovisual coding standards, such as MPEG-4 and MPEG-7, are alsobriefly described. In addition, the book covers the MPEG and DolbyAC-3 audio coding standards and emerging techniques for image andvideo compression, such as those based on wavelets and vectorquantization.
Image and Video Compression Standards: Algorithms andArchitectures, Second Edition emphasizes the foundations ofthese standards; namely, techniques such as predictive coding,transform-based coding such as the discrete cosine transform (DCT),motion estimation, motion compensation, and entropy coding, as well ashow they are applied in the standards. The implementation details ofeach standard are avoided; however, the book provides all the materialnecessary to understand the workings of each of the compressionstandards, including information that can be used by the reader toevaluate the efficiency of various software and hardwareimplementations conforming to these standards. Particular emphasis isplaced on those algorithms and architectures that have been found tobe useful in practical software or hardware implementations.
Image and Video Compression Standards: Algorithms andArchitectures, Second Edition uniquely covers all majorstandards (JPEG, MPEG-1, MPEG-2, MPEG-4, H.261, H.263) in asimple andtutorial manner, while fully addressing the architecturalconsiderations involved when implementing these standards. As such, itserves as a valuable reference for the graduate student, researcher orengineer. The book is also used frequently as a text for courses onthe subject, in both academic and professional settings.
726 citations