Hybrid keywynerziv frames with flexible macroblock ordering for improved low delay distributed video coding This paper proposes a concealment based approach to generating the side information and estimating the correlation noise for lowdelay, pixelbased, distributed video coding. The proposed method employs a macroblock pattern similar to the one used in the dispersed type FMO of H.264 for grouping the macroblocks of each frame into intra coded (key) and WynerZiv groups. Temporal concealment is then used at the decoder for concealing the missing macroblocks (estimating the side information  predicting the WynerZiv macroblocks). The actual intra codeddecoded macroblocks are used for estimating the correlation noise. The results indicate significant performance improvements relative to existing motion extrapolation based approaches (up to 25% bit rate reduction).

A simple reversedcomplexity wynerziv video coding mode based on a spatial reduction framework A spatialresolution reduction based framework for incorporation of a WynerZiv frame coding mode in existing video codecs is presented, to enable a mode of operation with low encoding complexity. The core WynerZiv frame coder works on the Laplacian residual of a lowerresolution frame encoded by a regular codec at reduced resolution. The quantized transform coefficients of the residual frame are mapped to cosets to reduce the bitrate. A detailed ratedistortion analysis and procedure for obtaining the optimal parameters based on a realistic statistical model for the transform coefficients and the side information is also presented. The decoder iteratively conducts motionbased sideinformation generation and coset decoding, to gradually refine the estimate of the frame. Preliminary results are presented for application to the H.263 video codec.