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Edge-preserving Intra mode for efficient depth map coding based on H.264/AVC

SIGNAL PROCESSING-IMAGE COMMUNICATION 2014年第7期29卷 711-724页

作者： Zamarin, M. Forchhammer, S. Tech Univ Denmark Dept Photon Engn DK-2800 Lyngby Denmark

depth-image-based-rendering (DIBR) algorithms for 3D video communication systems based on the "multi-view video plus depth" format are very sensitive to the accuracy of depth information. Specifically, edge regions in the depth data should be preserved in the coding/decoding process to ensure good view synthesis performance, which directly affects the overall system performance. This paper proposes a novel scheme for edge-aware Intra depth compression based on the H.264/AVC framework enabled on both Intra (I) and Inter (P) slices. The proposed scheme includes a new Intra mode specifically targeted to depth macroblocks with arbitrarily shaped edges, which are typically not predicted well by the standard Intra modes of H.264/AVC and result in high rate-distortion costs. The proposed algorithm segments edge macroblocks into two regions each approximated by a flat surface. A binary mask identifying the two regions is defined and encoded by means of context-coding with adaptive template selection. As a novel contribution, the proposed mode allows exploiting the correlation with causal neighboring edge macroblocks to improve the performance of context-coding of binary masks and allow significant bit rate savings. The proposed method has been exhaustively compared with different state-of-the-art algorithms for edge-aware depth coding and the results highlight significant improvements in most of the cases, both in terms of reconstructed depth quality, view synthesis performance, and overall texture plus depth rate-distortion performance. (C) 2014 Elsevier B.V. All rights reserved.

关键词： multi-view plus depth video coding Edge-aware depth map coding Context based coding depth-image-based rendering H.264/AVC

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