基于可变尺寸块运动矢量恢复的H.264时域差错掩盖算法

Temporal Error Concealment Algorithm for H.264 Based on Variable Size Block Motion Vector Recovery

针对H.264帧间预测编码的新特点,提出了一种基于可变尺寸块运动矢量恢复的时域差错掩盖算法。该算法首先利用相邻宏块编码模式的相关性,根据周围宏块的编码模式判断受损宏块的编码模式及运动矢量恢复的宏块划分方式,分别对各个划分的子块进行运动矢量的恢复;然后利用相邻块运动矢量参考帧的相关性,根据相邻块运动矢量的参考帧确定匹配使用的参考帧;最后采用边缘失真匹配方法恢复运动矢量。实验结果表明,该算法同传统的差错掩盖算法相比,由于支持不同尺寸块运动矢量的恢复,因此,算法对差错信号能够获得更好的恢复效果。

The latest video coding standard H. 264 supports variable size block motion prediction and compensation. Adapt to this new feature, a new temporal error concealment algorithm based on variable size block motion vector resilience, is proposed in this paper. Exploiting the correlation of adjacent macroblocks, the encoding mode of lost macroblock, partition pattern of lost macroblock, and the reference frame used in matching can be decided according to neighboring macroblocks＇ encoding mode and used reference frame information, and then motion vector is recovered for each partitioned subblocks using side distortion matching method. Finally, simulation results show the proposed algorithm is superior to conventional temporal concealment methods for H. 264 standard.