一种视觉模型引导的小波域彩色图像盲水印算法

摘要

This paper proposed a new blind watermarking algorithm for the color image to better solve the incompatible problem between invisibility and robustness. Firstly, the RGB space model of color host image transformed to YCbCr mode, then, each component implemented block processing and one-level discrete wavelet transform, next, according to the characteristics of human visual system, a visual model established in the algorithm which could guided embedding the watermark in wavelet coefficients of middle-frequency domain. Watermark extraction is simple and it doesn' t need host image or original watermark, and the introduction of the robust regulatory factor coordinated the resistance of the algorithm to various types of attacks. Experiment results show that, the watermark algorithm balances invisibility and robustness preferable, and this algorithm has a stronger robust against those attacks such as cutting, superimposed noise, and so on.%为了较好地解决水印不可见性与鲁棒性矛盾问题,提出了一种新的彩色图像盲水印算法.将原始彩色图像转换到YCbCr色彩空间,并对各分量进行分块处理及一级离散小波变换,利用人眼视觉特性建立视觉模型并引导水印嵌入到中频系数中.水印的提取简单且不需要原始载体图像和原始水印,鲁棒调控因子的引入协调了算法对各类攻击的抵抗能力.实验结果表明,该算法能较好地平衡不可见性和鲁棒性,并且对诸如剪切、叠加噪声等攻击具有更强的鲁棒性.