基于混沌和BEMD分解的小波域彩色图像数字水印算法  

A color image watermarking algorithm in DWT domain based on chaos system and BEMD

作　　者：刘程浩[1] 柏森[1] 刘博文[1] 徐庶[2] 

机构地区：[1]重庆通信学院 [2]71426部队

出　　处：《微型机与应用》2011年第11期45-48,共4页Microcomputer & Its Applications

摘　　要：提出了一种基于离散小波变换、混沌系统和二维经验模式分解的彩色图像数字水印算法。首先,对彩色载体图像的G通道进行一级小波分解,将其低频分量进行混沌位置置乱;然后将置乱后的低频分量进行二维经验模式分解,分解成5个基本模式分量和1个残差分量;最后,用水印信息代替第4个中低频基本模式分量实现信息嵌入。利用归一化互相关函数和峰值信噪比对算法进行评定,并对含水印的图像进行攻击。实验结果表明,该算法嵌入容量较大,且具有较好的透明性和鲁棒性。A watermarking algorithm based on chaos system and BEMD is presented to embed watermark in color image. Firsly the G channel of host color image is decomposed by wavelet transform and its low frequency components are scrambled by the chaos system. Then the scrambled low frequency components is decomposed into five IMF and a residue by BEMD. Finally, watermark is embedded by replacing the four intermediate frequency IMF components with the watermark. The algorithm was assessed by the normalization function and the PSNR, and the watermarked color image is attacked.Experimental results show that the watermarked color image has a high capacity of watermark information hiding, better imperceptibility and robustness.

关 键 词：数字水印 混沌系统 二维经验模式分解 离散小波变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]