Abstract: Aiming at the video integrity authentication problem, this paper proposes a fragile video watermarking algorithm based on fractal theory, which converts the color pattern RGB into color pattern YUV and embeds the watermark into the component Y. Transformed by DWT, the fractal feature of I-frame is extracted, which combines with the position feature of each frame to generate authentication code. Then, the authentication code which is scrambled by Logistic chaos mapping is embedded into the LSB bit of last two non-zero coefficients of DCT block. In the process of video authentication, it is possible to realize the blind detection without reference to the original video. The experimental results show that the proposed algorithm can effectively detect and locate the position of the original video which is attacked and tampered with, without degrading image quality.

Key words: fragile watermarking, DWT, DCT, fractal