基于ZIG-ZAG交织的H.264/AVC容错编码算法

本文提出了一种基于ZIG-ZAG交织的灵活宏块排列算法ZFMO,按ZIG-ZAG扫描方式沿次对角线方向上交织排列宏块,从而在低位率下达到了编码效率和容错性能的最佳平衡点.实验结果表明,ZFMO在低丢包率的网络环境下比当前H.264/AVC的推荐算法具有更好的编码效率和容错性能.经过率失真优化后的ZFMO算法性能进一步提高.

An Error Resilient H.264/AVC Video Coding Algorithm Using ZIG-ZAG Interleaved FMO

In accordance with the increasing requirements for video transmission over unreliable channels, the issue of error resifient video coding technology has been paid enough attention. Based on ZIG-ZAG interleaved flexible macroblock ordering, a novel algorithm called ZFMO is proposed in this paper.Different with the traditional raster .scan order,ZFMO achieves a good tradeoff between coding efficiency and error resilience by rearranging macroblocks in ZIG-ZAG scanning order and partitioning the macmblocks into different slice groups in an interleaved way. Experimental results show that ZFMO outperforms H.264/AVC recommended algorithm in low packet loss environments. The using of ZFMO influences intra frame prediction and motion estimation because of the macroblocks rearrangements, so the coding mode selection must be reconsidered. The rate distortion optimization based ZFMO decreases the redundancy bitrate while maintain recovery video quality and error resilience performance. Simulation results based on H.264/AVC reference software JM9 suggest that the performance of rote-distortion optimized ZFMO can be further improved.