基于HVS特性的混沌自适应水印算法  

An Adaptive Watermarking Algorithm via HVS Character and Chaotic Encryption

作　　者：楚君[1] 王玲[1] 王紫湘[1] 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《计算机仿真》2007年第6期304-306,共3页Computer Simulation

摘　　要：提出了一种DCT域自适应水印算法,该算法利用了经典的Logistic方程对水印进行混沌置乱加密,并将水印嵌入在图像视觉感觉最重要的部分-DCT域的直流或低频分量中,提高了水印的稳健性和安全性。同时.该算法还综合考虑了人类视觉掩蔽特性,根据原图像的特征进行分类分块,将水印以不同的强度嵌入在不同类的分块中,使水印在不可见性和稳健性上都能达到较好效果。实验结果给出了经历常见攻击后提取的水印图像,并计算出了相关系数,实验证明了该算法抗JPEG压缩性能好,对其它常见攻击的稳健性也较好。In this paper an adaptive watermarking algorithm in DCT domain is proposed. It embeds the image watermarking which is encrypted and scrambled by the typical Logistic equation into DC components or low frequency components,which are the most important parts for human vision, to improve the watermarking＇s robustness and security. Considering human visual model, it can achieve good effects both on invisibility and robustness by splitting the original image into blocks and classifying the blocks according to the image＇s characters, then inserting the watermarking into different blocks. The experiment results give watermarkings after normal attack. ,and calculate correlative coefficient. The results prove that this algorithm can strongly resist common attack ,especially the JPEG attack.

关 键 词：数字水印 人类视觉系统 自适应 混沌加密 离散余弦变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]