29 January 2007 Unequal error protection using Wyner-Ziv coding for error resilience
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Abstract
Compressed video is very sensitive to channel errors. A few bit losses can derail the entire decoding process. Thus, protecting compressed video is imperative to enable visual communications. Since different elements in a compressed video stream vary in their impact on the quality of the decoded video, unequal error protection can be used to provide efficient protection. This paper describes an unequal error protection method for protecting data elements in a video stream, via a Wyner--Ziv encoder that consists of a coarse quantizer and a Turbo coder based lossless Slepian--wolf encoder. Data elements that significantly impact the visual quality of decoded video, such as modes and motion vectors as used by H.264, are provided more parity bits than coarsely quantized transform coefficients. This results in an improvement in the quality of the decoded video when the transmitted sequence is corrupted by transmission errors, than obtained by the use of equal error protection.
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Liang Liang, Paul Salama, Edward J. Delp, "Unequal error protection using Wyner-Ziv coding for error resilience", Proc. SPIE 6508, Visual Communications and Image Processing 2007, 65080S (29 January 2007); doi: 10.1117/12.704361; https://doi.org/10.1117/12.704361
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