关键词: 鲁棒性，脆弱性，交流系数，运动矢量

Abstract: Proposed an improve mixed video watermarking scheme. 13y embedding the robust and fragile watermarkings into AC coefficients of the middle frequency in the I}CT macroblock and the horizontal component of motion vector to a- chieve the gold of hiding the secret and verifying information in the video, we can protect the video copyright with the a- bility of the integrity certification. I}he results show that; compared to the mixed video watermarking scheme proposed by U. Qiu et al, when embedding the robust watermark, the code rate decreases by 6 % on average and it owns a better resistance to attacks; the fragile watermark is more sensitive to attacks.

Key words: Robustness, Fragile, AC coefficients, Motion vectors