【摘要】 针对视频水印中存在的线性共谋攻击问题,建立了线性共谋攻击的数学模型,并根据建立的数学模型提出了抵抗线性共谋攻击的视频水印设计规则.基于该规则,提出了一种有效抵抗线性共谋攻击的视频水印方案.该方案从视频帧中自适应地选取一些互不重叠的8×8的块(子帧)作为嵌入区域,嵌入强度自适应于相应子帧的方差.实验表明,该算法在经过线性共谋、帧去除、帧插入、帧重组以及MPEG-2压缩等各种攻击后,水印提取的正确率仍可达到100%.更多还原

【Abstract】 A mathematical model was established to solve the problem of linear collusion attacks in video watermarking.From this model,the design rules of video watermarking for resistance to linear collusion were put forward.In addition,an adaptive video watermarking algorithm for effective resistance to linear collusion was proposed.Furthermore,some nonoverlapping blocks(subframes) 8 by 8 were adaptively selected as embedding regions,and watermark strength was adapted proportionally to the variances of the subframes.The experimental results show that with the proposed algorithm,the correct rate to extract watermark can reach 100% after linear collusion,frame removal,frame insertion,frame reorganization and MPEG(moving picture experts group)-2 compression.更多还原