中文摘要：

为了解决H．264压缩视频版权保护问题，提出一种新的低比特率视频水印算法。根据H．264中DCT系数分布特点，通过系数的符号编码，水印信息被嵌入到I帧DCT量化系数中。引入量化失真补偿的办法，降低了水印嵌入时引起的视频失真。水印检测时采用了符号相关检测思想，不需要原视频作参考，实现了盲检测功能。实验结果显示，新算法在保证较小视频失真的同时，能够很好地抵制H．264压缩攻击。

英文摘要：

In order to solve the problem of copyright protection for H.264 compressed video, a novel watermark algorithm of low bit-rate video is proposed. According to the distribution of DCT coefficients in H,264, by using the sign coding of the coefficients, watermark is embedded into the quantized DCT coefficients of the intra frame. For the sake of reducing the video distortion in watermarking, a quantized distortion compensation method is used. By using the mechanism of sign correlation detection, the original video is not needed in detection process which means the algorithm is blind. Experiment results show that the new algorithm can keep small distortion to video and well survive the H.264 compression attack.