几何变换攻击下数字水印新的同步方法  

A NEW SYNCHRONIZATION METHOD OF DIGITAL WATERMARK UNDER GEOMETRICAL ATTACK

作　　者：张仁昌[1] 耿国华[1] 

机构地区：[1]西北大学计算机科学系,陕西西安710069

出　　处：《计算机应用与软件》2007年第7期58-59,148,共3页Computer Applications and Software

基　　金：国家现代远程教育工程(中央财政专项)教育部专题<西北大学考古数字博物馆>项目(2001-234)内容。

摘　　要：目前,大多数鲁棒图像水印所面临的最大问题就是几何攻击,而现有水印技术大都难以抵抗几何变换类攻击,如旋转、尺度变换等,由于几何攻击破坏了水印分量的同步,即使微小幅度的图像旋转或尺度变换都可能导致水印检测过程失败。提出了一种新颖的基于傅立叶变换的方法来估计图像经历的几何变换。实验证明,提出的方案对几何变换攻击的水印同步具有很高的精确度。Geometric attacks are the challenging problems that most robust image watermarking systems face today. And most present watermarking technology is difficult to resist geometrical attacks such as rotation and scaling. Even the most slight rotation and scaling will lead to the failing of watermark detecting because the geometric attacks destroy the synchronization of watermarks. In this paper we report a novel method to estimate geometrical attacks the image has undergone based on Fourier Transformation. Experiments indicate that the scheme proposed in this paper has high precision of geometrically attacked watermark＇s synchronization.

关 键 词：几何攻击 数字水印 傅立叶变换 同步 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]