基于混沌加密和SVD的数字图像水印算法

摘要

为提高传统数字图像水印算法的安全性,提出一种基于混沌加密和奇异值分解的水印算法.采用Chebyshev混沌映射产生的混沌序列加密水印图像,将加密后的水印图像与原始图像进行分块,再对每一块进行奇异值分解,从而实现水印的嵌入.仿真实验结果证明,该算法对JPEG压缩、高斯噪声、椒盐噪声、滤波等具有较高的鲁棒性,同时能较好地抵抗剪切攻击.%In order to improve the security of digital image watermarking algorithm, a watermarking algorithm based on chaos-encryption and Singular Value Decomposition(SVD) is proposed. It applies Chebyshev chaos mapping to encrypt the watermarking image, makes the encrypted watermarking image and the host image into several blocks, and does SVD on every block. Hence the watermark is embedded into the host image. Simulation result shows that the algorithm is robust against JPEG compression, noise attack and filter attack, and it can resist crop attack.