基于Contourlet变换和子空间投影的非对称数字水印  

Asymmetric watermarking based on Contourlet transform and subspace projection

作　　者：何密[1] 成礼智[1] 

机构地区：[1]国防科技大学理学院,湖南长沙410073

出　　处：《通信学报》2009年第4期27-34,共8页Journal on Communications

基　　金：国家自然科学基金资助项目(60573027;60603014)~~

摘　　要：为保护数字图像的版权,提出一种新的基于Contourlet变换的特征子空间投影的非对称水印方法。构造的嵌入矩阵(私钥)和检测矩阵(公钥)不同,且嵌入矩阵保密,检测矩阵公开,同时可实现嵌入矩阵不依赖宿主图像。采用Contourlet变换获得顽健性子空间,用嵌入矩阵将任意水印嵌入顽健性空间中,并构造检测函数判断待测图像是否含有水印,因此该方法具有较好的安全性、较高的检测概率和较低的虚警概率,同时实验数据表明具有较强的顽健性,可以抵抗多种攻击。For the copyright protection of the digital image, a new asymmetric watermarking method of feature subspace projection based on Contourlet transform was presented. Embedding matrix （private key） and detecting matrix （public key） were constructed differently, where embedding matrix was kept secretly while detecting matrix was public. At the same time, the embedding matrix was independent on the host images. Robust subspace was obtained by Contourlet transformation. Using the embedding matrix, the arbitrary watermarking was embedded in the robust subspace. The detection function was constructed to detect whether an image had watermarking or not. The proposed method has good security, high detection probability and low false alarm probability. The stimulation shows that the proposed method is robust to many attacks.

关 键 词：非对称数字水印 CONTOURLET变换 版权保护 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TP309[自动化与计算机技术—计算机科学与技术]