基于Schur分解和混沌置乱的彩色图像鲁棒水印算法

针对传统的彩色图像水印算法往往仅是将一个随机信号或二值图像嵌入到彩色载体图像中这一问题,结合混沌系统和Schur分解的优点,提出一种将彩色水印图像嵌入到彩色载体图像中的鲁棒水印算法.首先,对彩色水印图像进行Arnold置乱和混沌加密,提高了待嵌入彩色水印图像的安全性能;其次,将彩色载体图像分离成3个通道,每一通道被划分为4×4的不重叠分块并对选择的分块进行Schur分解;最后,将预处理后的水印信号嵌入到Schur分解后的最大值元素中.实验结果表明,提出的算法具有较好的不可感知性,对滤波攻击、噪声攻击、JPEG压缩攻击和多种组合攻击都具有较好的鲁棒性.与基于Schur分解的相似水印算法相比,对于大多数攻击本文提出的算法具有更优越的抗攻击性能.

A color image robust watermarking algorithm based on Schur decomposition and chaotic scrambling

Aiming at the problem that the traditional color image watermarking algorithm usually only embeds a random signal or binary image into the color carrier image, by combining the advantages of chaotic system and Schur decomposition, a robust watermarking algorithm is proposed, which embeds a color watermarking image into a color cover image. Firstly, the Arnold scrambling and chaotic encryption are performed on the color watermarking image to improve the security performance of the color watermarking image. Secondly, the color cover image is separated into three channels, each channel is divided into 4×4 non-overlapping blocks, and Schur decomposition is done on the selected block. Finally, the pre-processed watermarking signal is embedded into the maximum energy element after Schur decomposition. The experimental results show that the proposed algorithm has better imperceptibility, and has better robustness to filter attacks, noise attacks, JPEG compression attacks, and multiple combined attacks. Compared with similar watermarking algorithms based on Schur decomposition, this algorithm has better anti-attack performance for most attacks.