基于几何校正的双树复小波域彩色图像水印算法  

A geometric correction based color image watermarking scheme using dual tree complex wavelet transform

作　　者：刘瑞远[1] 王春鹏[2] 

机构地区：[1]辽宁师范大学计算机与信息技术学院,辽宁大连116081 [2]大连理工大学计算机科学与技术学院,辽宁大连116024

出　　处：《微型机与应用》2015年第9期46-50,共5页Microcomputer & Its Applications

摘　　要：为了使图像水印算法拥有更好的鲁棒性和不可感知性,以双树复小波变换(DTCWT)为基础,提出了一种新的彩色图像盲水印算法。本算法将彩色图像颜色空间由RGB转换到YIQ,选取亮度分量Y进行双树复小波变换,得到低频子带,然后将加密后的水印信息嵌入到低频子带中。在水印提取过程中,使用了新颖的基于四元数PHT的最小二乘支持向量(LS-SVM)几何校正方法。实验结果表明,本算法具有更好的鲁棒性和不可感知性。To make the image watermarking scheme has higher robustness and better invisibility, this paper proposes a new color image blind watermarking algorithm on the basis of dual tree complex wavelet transform （DTCWT）. This algorithm converts image color space from RGB to YIQ. Dual tree complex wavelet transform is used with the luminance component Y for getting the low frequency subband. Then it embeds the encrypted watermarks to the low frequency subband. In the process of watermarks extraction, a novel geometric correction with least, squares support vector machine （LS-SVM） using quaternion PHT moment is exploited. Experimental results confirm that the algorithm has better robustness and invisibility.

关 键 词：图像水印 双树复小波变换 四元数PHT 几何校正 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]