基于改进型奇异值分解的数字水印算法

The Algorithm of Digital Watermarking based on Improved SVD

针对目前比较流行的基于小波变换和奇异值分解相结合的数字水印算法存在的一些缺陷,提出了如下两点改进:一是采取错位补偿的方法,改进了奇异值分解算法的对角失真。二是针对奇异值分解算法错警率高缺点,提出了将水印信息嵌入到RGB空间的B分量上的方案,并根据提出的波动率,选取合适的水印。实验结果表明:该算法不仅保持了很好的不可见性和鲁棒性,同时大大降低了错警率。

Two proposed methods improving digital watermarking algorithm based on multi-wavelet transform and SVD are given in this paper.Firstly,a improved method is used to reduce the distortion which is produced by SVD.Secondly,the other improved method is used to add the information of watermarking to B component which is in RGB space to reduce the error value because the SVD produces very high probability of error alarm.And according to probability of fluctuation,a proper watermarking is easy to choose.The experiment based on this algorithm demonstrates that the proposed method is robust to several attacks,and also this algorithm reduces the probability of error alarm.