H.264压缩域安全型视频水印算法

针对已有的视频水印算法安全性较差的问题，本文结合H.264的编解码特性，提出一种H.264压缩域安全型视频水印算法。算法首先对宏块中的16个子块进行标记，然后利用Logistic混沌序列、帧内预测模式和边缘特征选出前8个子块并将其分成两组，最后利用子块间能量差来嵌入水印。算法利用混沌序列对子块分组进行置乱增加了攻击者对水印信息进行篡改的难度，从而提高了算法的安全性。仿真实验证明该算法具有高安全性，另外具有较好的鲁棒性和透明性。

THE SECURITY OF VIDEO WATERMARKING ALGORITHM IN H.264 COMPRESSED DOMAIN

In terms of the poor security issue on existing video watermarking algorithm and combining with the features of the H.264 coding and decoding standard, a security of video watermarking algorithm in H.264 compressed domain is proposed. First, this algorithm needs to mark 16 sub blocks in a macro block; then choose the top 8 sub blocks according to Logistic chaotic sequence, the intra prediction mode, and edge property and classify them into two groups; finally, embed watermark information by energy difference between sub blocks. It uses Logistic chaotic sequence to scramble sub blocks in order to increases the difficulty for attacker to tamper watermark information and improve the security of this algorithm. The simulation experiment shows that this algorithm has higher security, better robustness and transparency.