Segmentation-based scheme for very low bit rate video coding

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Abstract
A video coding/decoding system for very low bitrate video has been developed. This hybrid coding scheme employs intraframe and interframe coding techniques. For intraframe coding, a wavelet-based method is used. For interframe coding, motion-estimation is employed to compute the displaced frame differences (DFD) and the DFD image is coded using a segmentation based method wherein the displaced frame is segmented into active and inactive regions. To meet the low bit rate requirements, the motion vectors are processed so as to reduce their contribution to the overall bitrate. Preprocessing techniques are also employed to generate a smooth motion-vector field. To reduce the coding artifacts, post-processing techniques have been developed for use at the decoder. In this paper, we present simulation results for several typical video sequences coded at 16 kbits/sec and at 32 kbits/sec.

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