双正交提升小波和奇异值分解的彩色水印算法研究

在现有彩色图像水印提取技术基础上, 提出一种结合9/7双正交提升小波和图像矩阵奇异值分解的彩色图像水印加密算法。首先将彩色原始图像和彩色水印图像R、G、B分离, 将图像相应分量进行提升小波三级分解得到低频部分, 并将该低频信息进行奇异值分解, 把水印信息视做扰动矩阵按一定的量加在低频信息的对角阵上, 其中彩色水印图像预处理结合了骑士巡游变换和Arnold置乱算法。实验结果表明算法在确保水印不可见性的基础上有效地增强了水印的强度和鲁棒性, 实现了水印图像的盲检验。

Research of color image watermarking algorithm based onbiorthogonal lifting wavelet and singular value decomposition

On the basis of the existing color image watermarking extraction technology, this paper proposed a color image watermark encryption algorithm which based on the 9/7 biorthogonal lifting wavelet and singular value decomposition. Firstly, it divided the color original image and color watermarking image intoR, G, B separation. The image components conducted the lifting wavelet transform three level decomposition and get the low frequency part. The watermark algorithm disposed the low frequency information by singular value decomposition and treated watermark information as matrix disturbance adding to diagonal matrix with a certain content. The pre-treatment of watermark information adopted the algorithm of knight-tour transform and Arnold scrambling. The experimental results show that the algorithm in the basis to ensure the invisibility of watermark effectively enhances the strength and the robustness of the watermark. The algorithm realizes blind test.