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http://dx.doi.org/10.5909/JEB.2011.16.2.274

A Depth-map Coding Method using the Adaptive XOR Operation  

Kim, Kyung-Yong (Media Lab., College of Electronics and Information, Kyung Hee University)
Park, Gwang-Hoon (Media Lab., College of Electronics and Information, Kyung Hee University)
Publication Information
Journal of Broadcast Engineering / v.16, no.2, 2011 , pp. 274-292 More about this Journal
Abstract
This paper proposes an efficient coding method of the depth-map which is different from the natural images. The depth-map are so smooth in both inner parts of the objects and background, but it has sharp edges on the object-boundaries like a cliff. In addition, when a depth-map block is decomposed into bit planes, the characteristic of perfect matching or inverted matching between bit planes often occurs on the object-boundaries. Therefore, the proposed depth-map coding scheme is designed to have the bit-plane unit coding method using the adaptive XOR method for efficiently coding the depth-map images on the object-boundary areas, as well as the conventional DCT-based coding scheme (for example, H.264/AVC) for efficiently coding the inside area images of the objects or the background depth-map images. The experimental results show that the proposed algorithm improves the average bit-rate savings as 11.8 % ~ 20.8% and the average PSNR (Peak Signal-to-Noise Ratio) gains as 0.9 dB ~ 1.5 dB in comparison with the H.264/AVC coding scheme. And the proposed algorithm improves the average bit-rate savings as 7.7 % ~ 12.2 % and the average PSNR gains as 0.5 dB ~ 0.8 dB in comparison with the adaptive block-based depth-map coding scheme. It can be confirmed that the proposed method improves the subjective quality of synthesized image using the decoded depth-map in comparison with the H.264/AVC coding scheme. And the subjective quality of the proposed method was similar to the subjective quality of the adaptive block-based depth-map coding scheme.
Keywords
3D Video Coding; Depth-map Coding; FTV(Free view-point TV); MVC(Multi-view Video Coding);
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