29 January 2007 Distributed video coding based on constrained rate adaptive low density parity check codes
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Abstract
In this paper, we present a distributed video coding scheme based on zero motion identification at the decoder and constrained rate adaptive low density parity check (LDPC) codes. Zero-motion-block identification mechanism is introduced at the decoder, which takes the characters of video sequence into account. The constrained error control decoder can use the bits in the zero motion blocks as a constraint to achieve a better decoding performance and further improve the overall video compression efficiency. It is only at the decoder side that the proposed scheme exploits temporal and spatial redundancy without introducing any additional processing at the encoder side, which keeps the complexity of the encoding as low as possible with certain compression efficiency. As a powerful alternative to Turbo codes, LDPC codes have been applied to our scheme. Since video data are highly non-ergodic, we use rate-adaptive LDPC codes to fit this variation of the achievable compression rate in our scheme. We propose a constrained LDPC decoder not only to improve the decoder efficiency but also to speed the convergence of the iterative decoding. Simulation demonstrates that the scheme has significant improvement in the performances. In addition, the proposed constrained LDPC decoder may benefit other application.
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Rong Ke Liu, Rong Ke Liu, Guo Gang Hua, Guo Gang Hua, Chang Wen Chen, Chang Wen Chen, } "Distributed video coding based on constrained rate adaptive low density parity check codes", Proc. SPIE 6508, Visual Communications and Image Processing 2007, 65080R (29 January 2007); doi: 10.1117/12.701060; https://doi.org/10.1117/12.701060
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