JOINT SPATIAL AND TEMPORAL CORRELATION EXPLOITATION FOR WYNER-ZIV FRAMES CODING IN DVC

Abstract

Source coding by exploiting the temporal and spatial correlations in an input video stream is well established in conventional video coding. However, when Distributed Video Coding (DVC) is concerned, shifting the source coding from the encoder to the decoder made this a more complicated and possibly a sub optimal process. Exploiting the temporal correlations has so far been attempted utilizing the key frames, by motion compensation using the interpolated (or extrapolated) motion field. However, exploiting the spatial correlations within the DVC framework is still an unsolved problem. In this paper, we propose to exploit both spatial and temporal correlations to generate the side information at the decoder. The proposed architecture involves a bit plane level side information refinement mechanism extracting both temporal and spatial information available at the decoder. Simulation results show that, the proposed coding scheme can achieve about 40% bit rate saving over 3D refinement algorithm proposed in [1] which is utilized as the basis for implementing the proposed technique.

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