基于小波树调制及方向可控金字塔域特征的抗几何攻击水印  

Geometrically Robust Image Watermark Based on Wavelet Tree Modulation Incorporated with Steerable Pyramid Features

作　　者：李振宏[1,2] 吴慧中[1] 

机构地区：[1]南京理工大学计算机科学与技术学院,南京210094 [2]南京信息工程大学计算机与软件学院,南京210044

出　　处：《计算机科学》2009年第3期232-236,共5页Computer Science

基　　金：江苏省自然科学基金项目(项目编号:BK2006569);长三角重大科技联合攻关项目(项目编号:BE2004400)资助

摘　　要：基于小波变换的抗几何攻击水印是当前数字水印研究的难点之一。基于方向可控金字塔变换域能量主方向特征及子带交叉相关特征实现了水印图像旋转失真的检测与恢复,采用基于人眼视觉特性的小波树自适应调制方法在小波树中完成水印的嵌入,水印的提取基于小波超树的能量对比关系实现。仿真结果表明,该算法可较好地抵抗旋转、缩放和剪切等几何攻击。Wavelet based geometrically robust digital watermark is one of the difficulties in image watermark. Energy dominant orientation in steerable pyramid domain and cross correlation between different orientation subbands wel;e used to estimate and restore the rotation of the watermarked image, adaptive wavelet tree modulation incorporated with HVS was used to embed the watermark, and the ratio of two super-trees＇ energy was employed to extract the watermark. The emulation result indicates that the proposed algorithm can efficiently resist such geometric attack as rotating, scaling and cropping.

关 键 词：方向可控金字塔变换 小波树 人眼视觉特性 抗几何攻击 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] X824.03[自动化与计算机技术—计算机科学与技术]