基于SIFT特征区域的抗几何攻击图像水印算法  

Geometrically Robust Image Watermarking Based on SIFT Feature Regions

作　　者：邓成[1] 高新波[1] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071

出　　处：《光子学报》2009年第4期1005-1010,共6页Acta Photonica Sinica

基　　金：教育部长江学者和创新团队支持计划(IRT0645);国家自然科学基金(60771068;60702061)资助

摘　　要：提出了一种基于局部特征区域的抗几何攻击图像水印算法.首先利用尺度不变特征变换在载体图像的尺度空间上提取特征点并形成特征区域,该区域具有缩放、平移不变性;然后通过主方向归一化,使这些区域具有旋转不变性;最后将水印信息重复嵌入到多个不重叠的局部特征区域的DFT中频系数中.仿真结果表明,该算法在获得较好的不可见性的同时,对几何攻击和常规信号处理均具有良好的鲁棒性.A novel robust image watermarking method using local feature regions is proposed. Scale Invariant Feature Transform （SIFT） is first adopted to extract feature points and to construct local circular feature regions which are invariant to scaling and translation. Then, these regions can achieve rotation invariance by normalizing their corresponding domiant orientations. Finally, watermarks are embedded in the mid frequency DFT coefficents of these non-overlapped local regions. Experimental results show that the proposed scheme not only gains high image quality, but also is robust against geometric attacks as well as common signal processing attacks, even some combined attacks.

关 键 词：数字水印 几何攻击 局部特征区域 主方向归一化 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]