For the shortcomings of current video watermarking algorithms on tamper detection, this paper proposes a video tamper detection algorithm based on semi-fragile watermark with Compressive Sensing. The image features of /-frame are extracted by Compressed Sensing algorithm, and semi-fragile content authentication watermarks are generated. The watermarks are embedded into the middle-high-frequency coefficients of /-frame, so to implement tamper detection inner frame. Through hash operation on the index of P-frames, integrity watermarks are generated. The watermarks are embedded into the motion vectors of P-frame, so to implement tamper detection among frames. Simulation results show that the algorithm has good detection ability for video tamper among frames and inner frame, whose accuracy can reach to the sub-block of image.%现针对目前的视频水印算法在篡改检测方面存在不足,提出一种基于压缩传感的半脆弱水印的视频篡改检测算法.通过压缩传感算法提取I帧的图像特征,生成半脆弱的内容认证水印,嵌入到I帧图像的中高频系数中,实现帧内篡改检测.通过对P帧的序号进行哈希运算,生成完整性水印,嵌入到P帧的运动矢量中,实现帧间篡改检测.仿真实验表明,算法对视频帧间篡改和帧内篡改具有较好的检测能力,能够精确到图像帧的子块.
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