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    Error concealment for packet video

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    azu_td_9706173_sip1_c.pdf
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    Author
    Yu, Gong-san, 1962-
    Issue Date
    1996
    Keywords
    Engineering, Electronics and Electrical.
    Computer Science.
    Advisor
    Marcellin, Michael W.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Two new algorithms are proposed for error concealment in the presence of cell/packet loss for packet video. Under packet switching network environments like Ethernet or ATM, some video packets may be lost or discarded due to transmission delay or channel congestion. Because video is normally compressed, small data losses may completely destroy the received video signal. Thus, lost block recovery or concealment becomes an essential issue for video communication over networks. The proposed algorithms use block DCT coding with one pixel overlap. Without any assumption on the smoothness of block boundaries, the combination of these two algorithms provide consistently good performance in lost block recovery. Experimental results show that the quality of the recovered video is much better than that obtained with maximally smooth methods. One additional advantage of the one pixel overlap structure is that it removes blocking effects automatically. Blocking effects are annoying problems for all block transform based image or video CODECs. With simple averaging operations on the overlapped pixels, all blocking effects can be suppressed. One-pixel overlapped block coding generally decreases the compression ratio for a given quantization step size. However, increases in PSNR achieved by overlapped block coding largely compensate for this effect. Experimental results show that for a given PSNR, the decrease in compression ratio is negligible. To demonstrate the proposed algorithms, a standard CCITT H.261 software encoder and decoder were created using C++. With minor modification, the standard CODEC is easily combined with our proposed error concealment algorithms to provide high performance block loss recovery for packet video.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Electrical and Computer Engineering
    Degree Grantor
    University of Arizona
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