关键词: H.264, 视频水印, 压缩传感, 随机投影, 视频认证

Abstract: For the problem of integrity authentication about compressed video streams, this paper proposed a video watermarking algorithm based on Compressive Sensing (CS). The H.264 compressed video stream was taken as the research object. By conducting random projection on the I frames of video sequences, a slight amount of measurements were obtained. Through quantization and replacement encryption, the measurements were embedded into the macro block which had the maximum amplitude in the motion vector in P frame. While authenticating, the watermark was extracted from the P frame that contains watermarked video sequences, and the similarly random CS projection on the I frames was conducted. By comparing the difference between the measurements, the integrity of video could be authenticated. The simulation results show that the intended video watermarking algorithm ensures high video quality, and little effect on the encoding rate, and it has strong robustness against attacks such as frame deletion and frame insertion.

Key words: H.264, video watermarking, Compressive Sensing (CS), random projection, video authentication