基于边信息抗仿射变换的数字图像水印算法  

Side-information-based image watermarking resistant to affine transformations

作　　者：袁大洋[1] 王颖[1] 

机构地区：[1]信息安全国家重点实验室(中国科学院研究生院),北京100049

出　　处：《中国科学院研究生院学报》2007年第1期86-92,共7页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：国家863计划项目(2003AA144080)资助

摘　　要：设计抗几何攻击的图像水印算法是数字水印技术研究中的难点.仿射变换是典型的几何攻击,能够使目前大多数数字水印算法失效.基于带边信息的水印模型,本文提出了一种利用Zernike矩的抗仿射变换多比特图像水印算法.该算法将归一化图像的Zernike矩作为边信息,利用量化技术对水印信息进行编码和嵌入.实验证明,本文提出的算法不仅具有很好的抗仿射变换和抗JPEG压缩的鲁棒性,而且具有较小的嵌入失真和较大的水印容量.Image watermarking resistant to geometric attacks is challenging at present. As a typical geometric attack, affine transformation can defeat most of existing watermarking schemes. This paper proposes a watermarking algorithm based on the watermarking model with side-information and using Zemike moments of cover image. Employing dither modulation, watermark is coded and embedded by taking the Zemike moments of the normalized image as side information. It has been proved by experiments that this algorithm has high imperceptibility, high capacity, and is robust to affine transformation and JPEG lossy compression.

关 键 词：数字水印 边信息 图像归一化 仿射变换 ZERNIKE矩 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]