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Proceedings Paper

Joint trilateral filtering for depth map compression
Author(s): Shujie Liu; PoLin Lai; Dong Tian; Cristina Gomila; Chang Wen Chen
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Paper Abstract

New data formats including 2D video and the corresponding depth maps enable new video applications in which virtual views can be rendered, such as 3DTV and free-viewpoint video (FVV). Different from video frames, depth maps typically consist of homogeneous areas (with no textures) separated by sharp edges representing depth value changes such as between foreground and background. Conventional video coding techniques with transforms followed by quantization typically result in large artifacts along such sharp edges. To suppress these coding artifacts while preserving edges, we propose in this paper a novel filtering method for depth coding, joint trilateral filter. The main contribution in the proposed filter design is the utilization of edge information in the collocated video frame as well as in the depth map. The filtering weights are determined by the following three factors: a domain (spatial) filter which measures the proximity of pixel positions, and two range filters. One range filter takes into account the similarity among depth samples and the other one considers the similarity among the collocated pixels in the video frame. By replacing the deblocking filter in H.264/AVC with the proposed trilateral filter, simulation results demonstrate up to 0.8 dB gain in rendering quality at given bitrate for depth signal.

Paper Details

Date Published: 14 July 2010
PDF: 10 pages
Proc. SPIE 7744, Visual Communications and Image Processing 2010, 77440F (14 July 2010); doi: 10.1117/12.863341
Show Author Affiliations
Shujie Liu, Univ. at Buffalo (United States)
PoLin Lai, Technicolor (United States)
Dong Tian, Technicolor (United States)
Cristina Gomila, Technicolor (United States)
Chang Wen Chen, Univ. at Buffalo (United States)

Published in SPIE Proceedings Vol. 7744:
Visual Communications and Image Processing 2010
Pascal Frossard; Houqiang Li; Feng Wu; Bernd Girod; Shipeng Li; Guo Wei, Editor(s)

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