提出一种适用于H.264压缩标准的视频完整性认证水印算法,通过对运动矢量残差MVD分量进行调制嵌入水印.考虑到视频的运动性,将水印嵌入到绝对值较大的残差分量中,并且在调制过程中限制对宏块的选择条件,从而降低水印嵌入对视频质量的影响.实验结果表明,本算法能够对视频是否遭受篡改,即视频内容的完整与否进行认证,并且水印嵌入后对视频质量和码率仅有微弱的影响.
An integrity authentication watermarking for H. 264 video compression standard is proposed. Watermark information embedded in the video frame by modulating the component of the residual motion vector. In order to reduce the impact of video quality after watermarking, the selection criteria for the macroblock was restrained. Furthermore, taking into account the movement of the video, the watermark is embedded into the larger absolute value of the residual component. Experimental results show that the algorithm brings very small bit-rate changes and video distortion, and can be subiected to tampering with the video, authentication the integrity of the video content.