离散小波变换和奇异值分解相融合的彩色图像水印算法

为加强数字多媒体的版权保护,提出了一种结合离散小波变换和奇异值分解相融合的彩色图像水印算法(DWT-SVD).首先对彩色数字载体图像进行小波分解,并对其小波系数进行奇异值分解;然后对水印信息采用Arnold进行置乱,并进行奇异值分解;最后将水印信息的奇异值嵌入到彩色图像的小波系数奇异值中,并对水印嵌入强度进行调节.仿真结果表明,DWT-SVD可以检测到完整的水印信息,具有良好的不可见性,对各种攻击具有较强的鲁棒性.

Color image watermarking based on discrete wavelet transform and singular value decomposition

In order to strengthen the digital multimedia copyright protection, this paper put forward a color image watermarking algorithm by combination of discrete wavelet transform and singular value decomposition(DWT-SVD). The color digital image are decomposed by wavelet transform, and the wavelet coefficients are decomposed by singular value decomposition; then the watermark information is scrambled by the Arnold algorithm and is decomposed singular value decomposition; finally the watermark singular values are embedded into the color image wavelet coefficients singular value, and adjusts the watermark embedding strength. The performance of DWT-SVD is test by simulation experiment, the simulation results show that the proposed algorithm can detect the watermark information well, and has good invisibility, and has strong robustness for all kinds of attacks.