针对H.264/AVC的时域错误隐藏算法

H.264/AVC采用了新的编码特征工具，充分利用它们能有效地改进错误隐藏的性能。树型结构的可变分块大小运动估计，使得与错误宏块直接相邻的分块数最多可达16个。本文提出一种基于平面拟合的时域错误隐藏算法。通过把与受损宏块直接相邻的每个分块的运动矢量定义为3维空间的一个点，采用平面拟合的方法表征小范围内相邻运动矢量的变化趋势，拟合得到受损宏块的运动矢量实现时域错误隐藏。对多种视频序列的仿真实验结果表明，相对于典型的错误隐藏算法，主观视觉质量和客观质量评价都有一定的提高。

Temporal error concealment algorithm for H.264/AVC video stream

A new unique encoding tools are adopted in H.264/AVC. Fully utilization of these tools in error concealment will greatly improve the concealment performance. The tree-structure macroblock division mode with variable sizes is used in H.264/AVC so that the amount of the divided blocks directly adjacent to the lost macro-block may be up to 16. The motion vector of each divided block surrounding the lost macro-block is projected to one point in 3D space. Then the plane fitting based MV recovery algorithm is proposed, in which one plane is constituted to present the MV changing tendency in small regions. Experimental results demonstrate the proposed algorithm is superior to other common used algorithm in both subjective and objective quality review.