I3D '01 Proceedings of the 2001 symposium on Interactive 3D graphics
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For inter frame coding, the motion-compensated residual takes a large proportion of the total bits and the efficiency of the followed transform greatly affects the compression performance. In this paper, we propose an adaptive transform scheme to further exploit the non-local correlation for the motion-compensated residual. For a video sequence, there are usually repeating similar contents, especially between adjacent frames, known as temporal redundancy. We then use these content-similar blocks of the coding block, which most probably reflect the characteristic of the coding block, to train the adaptive transform. The predicted block together with the boundary reconstructed pixels of the coding block forms the target patch and is used to guide the searching of similar blocks. By fully exploring the correlation of abundant similar blocks, the proposed scheme achieves 0.1~0.5 dB gain in term of PSNR at high bit rate over the state-of-the-art scheme. For Mobile and BQSquare, 1dB gain is obtained at high bit rate.