基于CRT的图像安全认证水印算法  

SECURE IMAGE AUTHENTICATION WATERMARKING BASED ON CHINESE REMAINDER THEOREM

作　　者：邓达平[1] 邓小鸿[1,2] 谢小云[1] 

机构地区：[1]江西理工大学应用科学学院,江西赣州341000 [2]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《计算机应用与软件》2012年第12期51-53,119,共4页Computer Applications and Software

基　　金：国家自然科学基金项目(61103202);江西省教育厅科研项目(GJJ12347);江西省理工大学科研项目(jxxj11168)

摘　　要：针对网络环境下图像传输的安全性问题,提出一种基于中国剩余数定理的数字水印算法,用于图像的版权或真实性认证。首先对图像进行分块并随机选取三个像素点作为嵌入载体;然后利用中国剩余数理论调整余数对之间的关系嵌入水印。接收端在给定正确除数对的情况下能实施水印解码,并利用投票理论确保水印的鲁棒性。实验结果证明了该算法在水印图像的保真度和嵌入容量上面具有优势,另外,算法具有较好的安全性和抗盐椒噪声的能力,适用于实际有损的传输信道。In order to solve the problem of image＇ s secure transmission through open network, we present a digital watermarking algorithm for image copyright or reality authentication, which is based on Chinese Remainder Theorem. First, the original image is divided into equalsized blocks, and three pixels are selected in random as the embedding carriers ; then the watermark information is embedded by adjusting the relationship of remainder-pair with Chinese Remainder Theorem. For the legal recipients, the watermark can be decoded with right divisor- pair given, and the voting theory is used to guarantee the robustness of watermark. Experimental results show that the proposed method has superiority in terms of fidelity and embedding capacity of watermarked images. In addition, the algorithm has preferable security as well as the capacity in resisting salt-and-pepper noise, and adapts for lossy transmitting channel.

关 键 词：中国剩余数理论 数字水印 图像认证 投票理论 盐椒噪声 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]