Abstract: Aiming at new feature of the H.264/AVC video coding standard, a fragile watermark algorithm based on H.264/AVC low bit-rate video stream is proposed. In video coding side that after the end of the P frame motion vector search and the best motion vector prediction, the algorithm extracts the residual motion vector, and embeds the watermark in the residual of the motion vector. In the video decoder side the algorithm extracts and detects the watermark, the watermark detection algorithm does not require the participation of the original video. Experimental results show that this algorithm has a smaller bit rate change and the video distortion, can ensure effectiveness and practicality of the algorithm.

Key words: motion vector, fragile watermark, H.264 standard

摘要： 针对H.264/AVC的编码特征，提出一种基于H.264/AVC低比特率视频流的脆弱水印算法。该算法在视频编码端的P帧经过运动矢量搜索和运动矢量预测之后，提取运动矢量残差，将水印嵌入在运动矢量残差中。在视频的解码端进行水印提取和检测，检测不需要原始视频的参与。该算法具有较小的码率变化、视频失真，以及较强的脆弱性。

关键词: 运动矢量, 脆弱水印, H.264标准