基于时空二维混沌的数字水印算法

本文提出一种将时空二维混沌应用到数字水印中去的算法。首先利用时空二维混沌直
接生成信息模板，加入到作品图像离散余弦变换（DCT）域的频率成分中去。合法使用者通过时空混沌中的初值和耦合系数来重新生成信息模板，与作品进行相关比较进行检测。由于时空二维混沌具有密钥空间大、参数敏感性的特点，该算法具有很高的安全性。实验表明，该算法对于抵抗各种噪声、滤波和压缩等攻击具有很好的鲁棒性。
Abstract: A new digital watermarking algorithm based on spatiotemporal chaos is proposed. This method firstly used two-dimensional chaos to generate template. After DCT transformation, graph’s frequency component was added with the template. The receiver used chaos’s initial value and coupling coefficient to regenerate the template. Through the comparison, the user can confirm the work’s copyright. Because the spatiotemporal chaos system has huge key space and was sensitive to the initial parameter, this method shows great security. Experimental results show that this scheme is very robust against the typical image processing attacks such as noise , filtering and lossy compression.