%0 Journal Article
%T Stereo Image Coding Based on Hierarchical Disparity Estimation<br>基于分层视差估计的立体图象编码
%A AN Ping
%A ZHANG Zhao-yang
%A <br>安平
%A 张兆扬
%J 中国图象图形学报
%D 2002
%I 
%X To compress the stereo video data, we propose an algorithm for stereo image coding based on hierarchical disparity estimation/compensation. A stereo image pair consists of a reference image and a target image. The reference image is coded by method using JPEG standard, while the target image is coded using the disparity estimation/compensation technique. We apply the wavelet transformation to code the created residual image, and use DPCM(difference pulse coding modulation) to code the disparity fields. Hierarchical Markov Random Field(MRF) model, Rate-Distortion(RD) model and the overlapped block matching/compensation are applied in the hybrid disparity estimation method to obtain a smooth and consistent disparity field. In terms of peak signal to noise ratio(PSNR) of the disparity compensated image, the proposed disparity estimation algorithm achieves about 2 5 dB higher PSNR, as compared to conventional variable size block matching. The experimental results also show that the disparity estimation/compensation in half pixel accuracy and dual-direction can obtain a 3dB higher performance than that of integer pixel accuracy only in horizontal direction. In the same quality of reconstructed image, our coding system can obtain 0 387 bits reduction in terms of coding bit rate of the target image compared to VSBM based scheme, and 1 003 bits reduction compared to the one using JPEG standard to code the target image. The proposed hierarchical model for disparity estimation effectively improves the efficiency of stereo image coding.
%K Stereo image coding
%K Disparity estimation
%K Markov random field(MRF)
%K Rate-distortion(RD) cost function<br>分层视差估计
%K 立体图象编码
%K 图象压缩
%K 马尔可夫随机场
%K RD
%K 率失真代价函数
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=D06194629680C940ACE75262F54B9D85&aid=FFDA191592691D59&yid=C3ACC247184A22C1&vid=DF92D298D3FF1E6E&iid=F3090AE9B60B7ED1&sid=E6E6318AC4BCBFDB&eid=FA63B973BAB5E93D&journal_id=1006-8961&journal_name=中国图象图形学报&referenced_num=1&reference_num=7