Sun, 27 Jul 2008 07:31:45 BST CiteULike: p2pstreaming's conferencing http://www.citeulike.org/user/p2pstreaming/tag/conferencing CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/p2pstreaming/article/2822435 <i>IEEE/ACM Trans. Netw., Vol. 4, No. 3. (June 1996), pp. 340-351.</i> Videoconferencing on the Internet Thierry Turletti Christian Huitema doi:10.1109/90.502233 IEEE/ACM Trans. Netw., Vol. 4, No. 3. (June 1996), pp. 340-351. 2008-05-22T06:46:42-00:00 1996 IEEE/ACM Trans. Netw. 1063-6692 4 3 340 351 IEEE Press conferencing video http://www.citeulike.org/user/p2pstreaming/article/2822354 <i>Circuits and Systems for Video Technology, IEEE Transactions on, Vol. 10, No. 1. (2000), pp. 63-67.</i><br /><br />We propose an analytically tractable approach to model compressed video traffic called C-DAR(1). The C-DAR(1) model combines an approach utilizing a discrete-time Markov chain with a continuous-time Markov chain. We show that this approach accurately models the distribution and exponential autocorrelation characteristics of video conferencing traffic. Also, we show that by comparing our analytical results against a simulation using actual video conferencing data, our model provides realistic results. In addition to presenting this new approach, we address the effects of long-range dependencies (LRD) in the video traffic. Based on our analytical and simulation results, we are able to conclude that the LRD have minimal impact on videoconference traffic modeling An analytically tractable model for video conference traffic Shugong Xu Zailu Huang Yan Yao doi:10.1109/76.825860 Circuits and Systems for Video Technology, IEEE Transactions on, Vol. 10, No. 1. (2000), pp. 63-67. 2008-05-22T06:02:15-00:00 2000 Circuits and Systems for Video Technology, IEEE Transactions on 10 1 63 67 analysis conferencing video http://www.citeulike.org/user/p2pstreaming/article/2822254 <i>Consumer Electronics, IEEE Transactions on, Vol. 42, No. 3. (1996), pp. 781-786.</i><br /><br />In this paper, a video coding algorithm suitable for video conference application, and an investigation of a video conference system over a LAN are presented. The proposed video coding algorithm is called the region base hybrid coding algorithm. This method can perform foreground and background segmentation. This is based on the characteristic of an unchanged background on most of the video conference applications. This property can reduce both data rate and computation load. The proposed algorithm is verified on a video conference system over a LAN, and it can work successfully A multimedia video conference system: using region base hybrid coding Hsu-Tung Chen Po-Cheng Wu Yeong-Kang Lai Liang-Gee Chen doi:10.1109/30.536185 Consumer Electronics, IEEE Transactions on, Vol. 42, No. 3. (1996), pp. 781-786. 2008-05-22T05:45:15-00:00 1996 Consumer Electronics, IEEE Transactions on 42 3 781 786 coding conferencing http://www.citeulike.org/user/p2pstreaming/article/2822178 <i>Circuits and Systems for Video Technology, IEEE Transactions on, Vol. 13, No. 10. (2003), pp. 982-992.</i><br /><br />This paper presents a region of interest transcoding scheme for multipoint video conferencing to enhance visual quality. In a multipoint video conference, usually there are only one or two active conferees at one time, which are the regions of interest to the other conferees involved. We propose a dynamic sub-window skipping scheme to firstly identify the active participants from the multiple incoming encoded video streams by calculating the motion activity of each sub-window and then dynamically reduce the frame rates of the motion inactive participants by skipping these less-important sub-windows. The bits saved from the skipping operation are reallocated to the active sub-windows to enhance the regions of interest. We also propose a low-complexity scheme to compose, as well as trace, the unavailable motion vectors with a good accuracy in the dropped inactive sub-windows after performing sub-window skipping. Simulation results show that the proposed methods not only significantly improve the visual quality of the active sub-windows without introducing serious visual quality degradation in the inactive ones, but also reduce the computational complexity and avoid whole-frame skipping. Moreover, the proposed algorithm is fully compatible with the H.263 video coding standard. Dynamic region of interest transcoding for multipoint video conferencing Chia-Wen Lin Yung-Chang Chen Ming-Ting Sun doi:10.1109/TCSVT.2003.816505 Circuits and Systems for Video Technology, IEEE Transactions on, Vol. 13, No. 10. (2003), pp. 982-992. 2008-05-22T04:55:40-00:00 2003 Circuits and Systems for Video Technology, IEEE Transactions on 13 10 982 992 conferencing transcoding video http://www.citeulike.org/user/p2pstreaming/article/2822059 <i>Networking, IEEE/ACM Transactions on, Vol. 8, No. 4. (2000), pp. 479-492.</i><br /><br />Videoconferencing is an important global application-it enables people around the globe to interact when distance separates them. In order for the participants in a videoconference call to interact naturally, the end-to-end delay should be below human perception; even though an objective and unique figure cannot be set, 100 ms is widely recognized as the desired one-way delay requirement for interaction. Since the global propagation delay can be about 100 ms, the actual end-to-end delay budget available to the system designer (excluding propagation delay) can be no more than 10 ms. We identify the components of the end-to-end delay in various configurations with the objective of understanding how it can be kept below the desired 10-ms bound. We analyze these components step-by-step through six system configurations obtained by combining three generic network architectures with two video encoding schemes. We study the transmission of raw video and variable bit rate (VBR) MPEG video encoding over (1) circuit switching; (2) synchronous packet switching; and (3) asynchronous packet switching. In addition, we show that constant bit rate (CBR) MPEG encoding delivers unacceptable delay-on the order of the group of pictures (GOP) time interval-when maximizing the quality for static scenes. This study aims at showing that having a global common time reference, together with time-driven priority (TDP) and VBR MPEG video encoding, provides adequate end-to-end delay, which is (1) below 10 ms; (2) independent of the network instant load; and (3) independent of the connection rate. The resulting end-to-end delay (excluding propagation delay) can be smaller than the video frame period, which is better than what can be obtained with circuit switching End-to-end delay analysis of videoconferencing over packet-switched networks M Baldi Y Ofek doi:10.1109/90.865076 Networking, IEEE/ACM Transactions on, Vol. 8, No. 4. (2000), pp. 479-492. 2008-05-22T04:19:00-00:00 2000 Networking, IEEE/ACM Transactions on 8 4 479 492 conferencing delay http://www.citeulike.org/user/p2pstreaming/article/669081 <i>(1998), pp. 55-60.</i> Measuring perceived quality of speech and video in multimedia conferencing applications Anne Watson Angela Sasse doi:10.1145/290747.290755 (1998), pp. 55-60. 2006-05-24T21:30:00-00:00 1998 55 60 ACM Press conferencing multimedia perceived quality video