With the increasing application of advanced video coding (H.264/AVC) in the multimedia field, a great significance to research in\nvideo watermarking based on this video compression standard has been established. We propose a semifragile video watermarking\nalgorithm, which can simultaneously implement frame attack and video tamper detection, herein. In this paper, the frame number\nis selected as the watermark information, and the relationship of the discrete cosine transform (DCT) nonzero coefficients is used as\nthe authentication code. The 4 * 4 subblocks, whose DCT nonzero coefficients are sufficiently complex, are selected to embed the\nwatermark. The parities of these nonzero coefficients in the medium frequency are modulated to embed watermarks. The\nexperimental results show that the visual quality of the embedded watermarked video is virtually unaffected, and the algorithm\nexhibits good robustness. Furthermore, the algorithm can correctly implement frame attack and video tamper detection.
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