一种彩色图像内容认证混沌脆弱水印算法  

Chaotic Fragile Watermarking Algorithm for Color Image Content Authentication

作　　者：贺文华[1,2] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083 [2]湖南人文科技学院计算机系,湖南娄底417000

出　　处：《湖南大学学报（自然科学版）》2009年第1期55-58,共4页Journal of Hunan University:Natural Sciences

基　　金：湖南省自然科学基金资助项目(06JJ5098);湖南省教育厅科研资助项目(06C437)

摘　　要：提出了一种结合彩色图像分量内容和混沌系统的脆弱数字水印算法.将原始图像R分量和B分量的像素值经混沌序列调制后映射成另一个混沌系统的初值,经多次迭代生成4灰度级的水印图像;然后把它嵌入原始图像G分量的最低2比特平面.利用混沌对初值极端敏感性的特点,能够精确地定位对加入水印图像的篡改,并且水印提取不需要原始图像.实验结果表明了所提出水印方案对篡改证明的有效性、敏感性以及良好的篡改定位能力.A fragile watermarking algorithm combined with color components content of image and chaotic system was proposed. Let the pixel values of R and B components of host image, which were modulated by the first chaotic system, map the initial values of the second chaotic mapping. The watermarks obtained by iterating several times of the second chaotic mapping were embedded into the two low hit-planes of the host image. The proposed scheme can localize the tampers on the watermarked image by using the high sensitivity on the initial value of the chaotic mapping. Moreover, no host image is needed in watermark extraction. Simulation results have shown the effectiveness, sensitivity and localization of the tamper-proofing of this algorithm.

关 键 词：彩色图像 脆弱水印 认证 混沌 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]