H.264是一种高压缩比、高视频质量、高复杂度的新一代视频压缩标准，因为其高压缩率的特性，一些常用的水印方案无法直接运用于该视频压缩标准。提出了一种利用运动矢量的区域特性来隐藏水印信息的视频水印方案，该算法的最大特点为简单、实用，并且在隐藏水印信息的过程中还可以降低H.264编码中运动估计部分的运算复杂度。实验结果表明，通过该算法对视频图像嵌入水印后，主观上无法分别图像区别，PSNR值的波动被有效的控制在±0.1范围内，码率的增加在2%左右，并且插入的水印信息能够被100%的正确提取，运动估计中的搜索点减少1/2。由此表明，该算法是一种简单、高效的视频水印隐藏方案，并且细化区域的分类，可以达到使隐藏的水印信息加倍的效果。

H264 is a new video compression standard with high compression rate, high video quality and high complexity. Because of the high compression rate, some normal watermarking scheme cant be used in H264 directly. In this paper, a video watermarking scheme base on the region character of motion vectors is proposed. Moreover, computational complexity is reduced by 50%. From the experimental result, after embedded the watermark, there is no difference between the original image and that of embedded watermark. The fluctuation of PSNR is controlled within ±01 and the increase of bit rate is controlled within 1%. In motion estimation, Search points are half of the original one. So this scheme is an easy and high efficient method to embed watermark. And the capacity of watermark can be doubled by judging four regions.