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.
出处
《计算机科学》
CSCD
北大核心
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
