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新一代视频编码标准H.264/AVC支持多种块模式的运动估计,一个宏块(MB)最多可能有16个运动矢量,这些信息都可用于时域误码掩盖。为此该文提出了一种基于宏块分割模式的时域误码掩盖算法,同时为了减少边界效应,引入了重叠块运动补偿来提高人眼的主观满意度。仿真结果表明:对于不同运动程度的序列和宏块丢失率,该算法的性能优于传统算法。当宏块丢失率为20%时,该算法恢复的视频峰值信噪比(PSNR)较传统算法可提高0.9~1.2 dB。
The next-generation video coding standard H.264 / AVC supports motion estimation in multiple block modes. Up to 16 motion vectors per macroblock (MB) may be used for time-domain bit error concealment. Therefore, a time-domain error concealment algorithm based on macroblock partitioning mode is proposed in this paper. In order to reduce the boundary effect, overlapping block motion compensation is introduced to improve the subjective satisfaction of the human eye. The simulation results show that the performance of this algorithm is better than the traditional algorithm for the loss of sequences and macroblocks with different degrees of motion. When the macroblock loss rate is 20%, the PSNR of this algorithm can be improved by 0.9 ~ 1.2 dB compared with the traditional algorithm.