一种基于DWT域的彩色图像数字水印算法  

An Algorithm of Color Image Digital Watermarking Based on 2-dimension DWT

作　　者：何冰[1] 

机构地区：[1]渭南师范学院物理与电气工程学院,渭南714000

出　　处：《计算机与数字工程》2011年第6期126-130,共5页Computer & Digital Engineering

基　　金：渭南师范学院科研计划项目(编号:11YKS015)资助

摘　　要：针对目前实用的彩色图像数字水印技术不多,特别是灰度级水印信号的嵌入算法比较少,文章提出一种二维的DWT彩色图像数字水印的新算法。基本思想是:选取二维条形码作为嵌入的水印,在嵌入之前对其进行二值化,再对结果进行分块并且对各个子块进行编码,最后将各个子块合并后的图像按照某种顺序排列作为水印。考虑到人类的视觉系统(HVS)特点,我们采用YIQ色彩空间,将水印信号嵌入到载体图像的亮度分量Y的DWT后的低频系数上。实验结果证明该算法对加噪,JPEG压缩,低通滤波,中值滤波,几何剪切等攻击具有很好的鲁棒性。The existing practical techniques in color image digital watermarking is lesser studied,especially for the embedding algorithm of grayscale watermarking signal,this paper proposes a new algorithm of 2-dimension DWT color image digital watermarking.The basic idea is first carries on 0,1 two values to the 2D barcode,then divides result into block,and carries on encoding to each block,finally organizes the picture which is formed by merging each sub-block according to specific arranged as the watermark.considering human visual system,we transform RGB space to YIQ space and embed watermark image into the low frequence of luminance Y of the color image by using discrete wavelet transform.The experiment show that the proposed method is better robust to adding noise,JPEG compression,low frequence filtering,mean frequence filtering,geomertic croping attack etal.

关 键 词：DWT YIQ色彩空间 二维条形码 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]