Abstract: According to the new H.264 coding standard，a video watermark scheme based on motion vector and mode selection is proposed.The watermark is embedded into the motion vector with small splitting.By minimizing the Laragian function in motion search to find the motion vector that has the best rate distortion performance.Experimental results demonstrate that the algorithm can achieve robustness to the re-encoding and noise attacks with little affect to video quality and bit rate.

Key words: video watermark, mode selection, H.264, Laragian function

摘要： 根据H.264编码的新标准，提出一种基于运动矢量和模式选择的视频水印方案。将水印嵌入到具有小分割模式的宏块中，通过在运动搜索中最小化拉格朗日函数选择嵌入水印后具有最佳率失真性能的运动矢量作为嵌入点。实验结果表明，该算法对视频的质量和码率影响较小，并且水印对视频的重量化编码和噪声攻击有一定的鲁棒性。

关键词: 视频水印, 模式选择, H.264, 拉格朗日函数