DCT域内视频分形脆弱水印算法

A Fragile Video Watermarking Algorithm Based on Fractal Theory

针对视频完整性认证问题,提出一种DCT域内视频分形脆弱水印算法。首先把视频I帧的RGB色彩模式转换为YUV色彩模式,并对Y分量进行DWT变换;然后提取I帧的分形特征,结合每一帧的位置特征生成认证码,用Logistic混沌映射将认证码置乱;最后将置乱的认证码嵌入每一帧DCT块最后2个非0系数的LSB位上。在视频认证过程中,无需参考原视频,实现了盲检测。实验结果表明,该方法在保证原视频质量的情况下,能有效检测到对原视频的篡改和攻击,并能定位篡改和攻击的位置。

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 YUVand embeds the watermark into the component Y.Transformed by DWT,the fractal feature of I-frame is extracted,which combines witli the position feature of each frame to gener-ate 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 detec-tion without reference to the original video. The experimental results showthat the proposed algorithm can effectively detect andlocate the position of the original video which is attacked and tampered with,without degrading im