MCRD: Motion coherent region detection in H.264 compressed video

One of the challenging issues in video watermarking is robustness against collusion attacks. To resist collusion attack, the same video scene should carry the same watermark, whenever and wherever it appears in the video. Inter-frame correlation is more within a short video neighborhood when no scene change is detected. Motion coherency has recently been recognized as a desirable property for watermarks to resist temporal frame averaging attacks. To the best of our knowledge, motion coherent watermarking in compressed domain has not yet been well explored. In this paper, a compressed domain technique has been proposed to detect motion coherent regions within a short video neighborhood. The time complexity of the proposed method is discussed. Simulation results evaluate the effectiveness of the proposed method.