基于分形编码的数字水印攻击算法  

An Algorithm for Digital Watermarking Based on Fractal Coding

作　　者：龚理[1] 邹北骥[1] 孙家广[2] 

机构地区：[1]湖南大学计算机与通信学院,湖南长沙410082 [2]清华大学计算机科学与技术系,北京100084

出　　处：《计算机工程与科学》2005年第3期108-110,共3页Computer Engineering & Science

基　　金：湖南省自然科学基金资助项目(02JJY3049)

摘　　要：本文提出了一种新的数字水印攻击算法。该算法对嵌入水印的图像运用分形编码,使含有特定水印信息的图像块被压缩映射后的其他块代替,压缩映射后的块和被代替块中的水印信息具有弱相关性。我们对一种基于多分辨率分解的数字水印嵌入方案进行了攻击实验,分析了攻击对图像质量的影响。结果表明,该算法使水印提取算子的相关性检测结果显著下降。This paper presents a new attacking scheme on digital watermarking systems based on fractal coding. In this scheme, the image blocks marked with particular watermarking information are substituted by the other parts of image in the form of contracted mapping. The watermarking information in the contracted mapping has little correlation with that in the original blocks. An attack experiment on a multiresolution decomposition based watermarking algorithm is given, and the in ffluence on image quality is analyzed. Experimental results show that the extracted correlation decreases remarkably after the attack.

关 键 词：图像编码 分形编码 数字水印攻击算法 水印嵌入技术 

分 类 号：TN919.81[电子电信—通信与信息系统]