基于POCS的分组视频错误隐藏

G.-S. Yu, M. Marcellin, M.M.-K. Liu
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摘要

只提供摘要形式。本文提出了一种新的分组视频错误隐藏算法,有效地消除了错误传播的影响。大多数标准视频编解码器使用运动补偿来消除时间冗余。通过这种帧间运动补偿处理,任何丢包都可能在超过10个连续帧中产生严重的错误传播。这种类型的错误传播导致感知上令人讨厌的工件。因此,需要使用适当的错误隐藏算法来减少这种影响。该算法采用一像素块重叠编码结构,解决了误差传播问题。在没有丢包的情况下,重叠区域的解码像素强度应该是一致的(由于量化误差造成的差异很小)。当丢包发生时,相应的重构帧和引用它的所有帧都被损坏。这种损坏会导致损坏帧重叠区域的像素强度不一致。所提出的错误隐藏方法将丢包恢复问题作为参数估计问题之一。利用凸集投影法(POCS)估计损失变换系数。所述估计以使重构帧的重叠区域中像素强度的一致性最大化的方式执行。实验结果表明(使用改进版的CCITT H.261),即使在损坏帧丢失所有DCT系数的情况下,该方法仍能取得良好的错误隐藏效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
POCS based error concealment for packet video
Summary form only given. This paper proposes a new error concealment algorithm for packet video, effectively eliminating error propagation effects. Most standard video codecs use motion compensation to remove temporal redundancy. With such motion compensated interframe processing, any packet loss may generate serious error propagation over more than 10 consecutive frames. This kind of error propagation leads to perceptually annoying artifacts. Thus, proper error concealment algorithms need to be used to reduce this effect. The proposed algorithm adopts a one pixel block overlap coding structure to solve the error propagation problem. If no packet loss occurs, the decoded pixel intensities on the overlap areas should be consistent (with small differences caused by quantization error). When a packet loss occurs, the corresponding reconstructed frame and any frames referring to it are all damaged. Such damage causes inconsistent pixel intensities on the overlap areas of damaged frames. The proposed error concealment method poses the packet loss recovery problem as one of parameter estimation. Lost transform coefficients are estimated by the method of projection onto convex sets (POCS). The estimation is performed in a manner that maximizes the consistency of pixel intensities in the overlap areas of the reconstructed frames. Experimental results (using a modified version of CCITT H.261) show that it can have good error concealment results even when the damaged frame loses all the DCT coefficients.
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