In this paper, a new block-based pixel domain distributed video coding scheme featured with variable block modes is proposed. In addition to intra mode and Wyner-Ziv mode employed in conventional block-based distributed video coding scheme, two supplementary block modes "SKIP mode" and "zero motion mode" are introduced in the proposed scheme to improve the overall coding efficiency, as well as to reduce the decoding complexity. Moreover, the channel coding is performed on macroblcok level to reduce the coding loss due to inserted information in the parity bits. The simulation results show that the proposed scheme outperforms both the conventional frame-based transform-domain and the blockbased pixel-domain distributed coding schemes.

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Wyner-Ziv coding (WZC) has received a lot of attention lately. Based on the block unit for WZ-/intra-coding and the temporal distance between two consecutive key blocks, two techniques are proposed to improve the performance of block-based distributed video coding. Depending on the spatiotemporal analysis, the first method adjusts the mode assignment to a more precise generation of side information. In addition, the second method carries out the correlation calculation in the encoder side to ensure a better statistical estimation between the side information frame and the original frame. Thus, the more accurate side information combined with the more reliable statistical parameters results in an improved coding efficiency. The simulation results show that the compound of these two proposed methods has an improvement up to 2.7 dB with respect to the previous work in block-based WZC.