一种基于子采样的混合域稳健零水印算法  

A Robust Zero-Watermark Algorithm in Hybrid Transform Domains Based on Subsampling

作　　者：韩绍程[1] 张兆宁[2] 

机构地区：[1]中国民航大学基础实验中心,天津300300 [2]中国民航大学空中交通管理学院,天津300300

出　　处：《图学学报》2013年第3期20-24,共5页Journal of Graphics

基　　金：国家自然科学基金资助项目(71171190);中国民航大学科研基金资助项目(2012KYE02)

摘　　要：为了实现对图像数据版权的有效保护,论文提出了一种新的基于子采样的混合变换域零水印算法。先将载体图像进行非下采样剪切波变换,变换后的低频分量经过子采样后得到4幅子图,然后对每一幅子图进行分块处理,最后通过比较两幅随机子图中规定映射位置上子块DCT变换后的直流分量的大小关系构造零水印。实验结果表明,该算法能够较稳健地抵抗添加噪声、JPEG压缩和剪切等多种常见的攻击操作,同时具有较高的安全性。A novel zero-watermark algorithm is proposed based on subsampling in hybrid transform domain for the copyright protection of image dates.In this method,the host image is performed with Non-Subsampled Shearlet Transform（NSST） firstly,and low-frequency component is divided into four sub-images by subsampling,then block processing is done to every sub-image.Finally,the zero-watermark is constructed by judging the numerical relationship between the DC coefficients of two special blocks from different sub-images randomly.Experimental results show that the method is very robust to common attack operations such as Adding noise,JPEG compression,Cropping and so on.

关 键 词：零水印 子采样 剪切波变换 DCT 

分 类 号：TP911.73[自动化与计算机技术]