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 esti⁃mation, 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 real⁃time transmission.
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