视频编码标准H.264运动矢量搜索算法

Research of The Motion Vector Search Algorithm of H.264

高清视频的信息量巨大,传输比较困难。H.264作为视频压缩的主流标准,可以有效去除视频的冗余信息,提高视频的网络传输能力。针对H.264中运动估计算法耗时严重的问题,提出一种新的X型搜索算法。X型算法由粗到细地进行搜索,先以X型快速搜索确定运动矢量的可能范围,然后在可能范围内进行局部全搜索,最终确定运动矢量。试验结果表明,X型搜索能够在保证视频质量的情况下大幅度缩短编码时间,有效提高运动估计算法的效率,兼顾了速度与精度,为高清视频的实时传输提供了保障。

HD video has large amount of message,so it’s difficult to transport. To improve the real-time transmission ability of HD video,we can use H.264 to compress it. Aiming at the problem of the serious time-consuming of H.264？s motion estimation ,this paper propose a new method X- research. X-research search from widely range to details, first search for the pos-sible range of motion estimate algorithm with X form ,then search completely in partition. Considering of both sufficiency and precision,then fix the motion estimate algorithm finally. Based on the experiment,X-research can reduce the coding time greatly,and improve the efficiency of H.264’s motion estimation effectively. It provide guarantee to HD video’s realtime transmission.