基于图像不变特征与三角剖分的水印算法  

Image Watermarking Scheme Against RST Attack Based on SIFT Feature and Optimal Triangulation

作　　者：刘晶[1] 张九龙[1] 李晔[1] 王竹荣[1] 

机构地区：[1]西安理工大学计算机科学与工程学院,陕西西安710048

出　　处：《西安理工大学学报》2009年第2期227-230,共4页Journal of Xi'an University of Technology

基　　金：陕西省教育厅专项科研基金资助项目(05JK273)

摘　　要：针对数字水印抗几何攻击问题,提出了一种基于尺度不变特征变换(SIFT)筛选特征点的算法,以增强提取特征点的鲁棒性。基于筛选的SIFT特征点,在载体图像中生成一凸多边形区域,利用动态规划算法最优三角剖分该区域,通过密钥K对剖分得到的三角弦等间隔采样,获得更小的三角形。水印信息嵌入在以每个小三角形的质心为圆心的圆周区域内。实验结果表明,该方法对RST攻击具有鲁棒性。With an aim at the problem of the geometric attacks, a novel robust image watermarking method is proposed based on scale invariant feature transform （SIFT）. SIFT feature points are sifted to form a convex polygon, which is then optimally triangulated by dynamic programming. The triangle strings inside the polygon are then sampled equispacedly with secret key K to obtain smaller triangles. The watermark is then embedded into the circles centering around the centeroid of each triangle. The experiments show that method is considerably robust against rotation, scale, and translation （RST） attacks.

关 键 词：尺度不变特征变换 动态规划算法 凸多边形 最优三角剖分 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]