基于复合离散混沌迭代系统的半脆弱水印算法  

A semi-fragile watermark algorithm based on composite discrete chaotic iteratien system

作　　者：吴向东[1] 

机构地区：[1]中南林业科技大学计算机科学学院,湖南长沙410004

出　　处：《中南林业科技大学学报》2010年第7期176-180,共5页Journal of Central South University of Forestry & Technology

基　　金：中南林业科技大学青年基金项目(2008039B)

摘　　要：针对一般傅立叶域水印算法中水印嵌入点固定、易受攻击的特点,利用复合离散混沌迭代系统,选取非固定的频率点作为水印信息嵌入点,大大提高了水印信息的安全性。同时,为保证水印算法的鲁棒性,采取双重嵌入的策略,这样即便一个嵌入点受到攻击,还可以从另一点提取水印信息。实验表明,本算法安全性高,鲁棒性也好于基于傅立叶变换的单重嵌入方法。Considering the charactenistics that watermark information was embedded into low frequency point and easy to be attacked when a general watermark algorithm was used and based on discrete Fourier transform,the composite discrete chaotic iteration system was adopted to embed watermarking information,and non-fixed frequency points were chosen,thus the security of watermarking information was grealy impoved.Meanwhile,in order to guarantee the robustness of the algorithm,a dual embedding strategy was used to embed watermarking information.As a result,even for one of the points is attacked,the watermark imformation can be extracted from another point.Experimental results show that the security of this algorithm is high,and the robustness is better than single embedding strategy.

关 键 词：数字水印 半脆弱水印 离散傅立叶变换 复合离散混沌迭代系统 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]