一种基于伪随机数调制的混合域盲水印算法  

A Blind Watermarking Algorithm Based on Pseudo-random Number Modulation in the Mixed-domain

作　　者：王志伟[1] 龚晓静 韩绍程[3] WANG Zhi-wei, GONG Xiao-jing, HAN Shao-cheng （1.College of Continuing Education of Civil Aviation University of China, Tianjin 300300, China; 2.Basic Experimental Centor of Civil Aviation University of China, Tianjin 300300, China; 3.General Semiconductor （China） Co., Ltd., Tianjin 300457, China）

机构地区：[1]中国民航大学继续教育学院,天津300300 [2]通用半导体中国有限公司,天津300457 [3]中国民航大学基础实验中心,天津300300

出　　处：《电脑知识与技术》2010年第01Z期437-439,共3页Computer Knowledge and Technology

摘　　要：提出了一种基于伪随机调制技术的混合域彩色图像盲水印算法，先将彩色图像由RGB空间转换到HSI空间，并取出饱和度分量S，随后对S分量多小波变换后的中频区域进行分块DCT变换，对每个DCT系数子块，按一定的方案提取出若干个中频系数。然后使用密钥产生两个互不相关的伪随机数列，用其调制前面选出的DCT系数来嵌入水印。通过比较两个伪随机数列和待检测系数相关性的大小来实现水印的提取，不需要原始图像参与。实验结果表明，该算法能有效抵抗剪切JPEG压缩、放缩和较大强度的噪声攻击等攻击操作。A blind watermarking algorithm based on pseudo-random modulation technique in the mixed-domain for color images is proposed, First color image is converted from R.GB space to HSI space, and the saturation component S is got, then the S-component after multi-wavelet transform generate some mid-frequency regions, then apply block DCT transform on the regions, at last pick out some midfrequency coefcients for each DCT sub-block according to a certain program. Generate two unrelated pseudo-random series with keys, with which modulation the DCT coefficients selected in the front to embed watermark.. The Watermark is extracted through comparing correlation coefficient between the coefficients to be detected and each pseudo-random series, which do not need the original image. Experimental results show that the algorithm can resist shear, JPEG compression, zoom and greater intensity noise attack and so on effectively.

关 键 词：数字水印 伪随机数调制 多小波变换 DCT变换 盲提取 

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