基于复Hadamard变换的盲数字水印算法  

A complex Hadamard-based blind watermarking for digital image

作　　者：王振飞[1,3] 张玉凤[3] 施保昌[2] 王能超[2] 

机构地区：[1]华中科技大学计算机科学与技术学院,湖北武汉430074 [2]华中科技大学并行计算研究所 [3]郑州大学信息工程学院,河南郑州450001

出　　处：《华中科技大学学报（自然科学版）》2006年第7期30-32,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60473015);河南省科技攻关项目(423020300).

摘　　要：提出一种基于复Hadamard变换的盲数字图像水印算法.复Hadamard变换系数具有重要的半谱特性,利用复Hadamard变换这一独特性质嵌入一幅二值水印图案.为了增加水印的稳健性,采用(7,4)汉明编码将水印的校验图也嵌入到复Hadamard变换域中.特别是,水印图案的提取不需要原始图像.实验结果表明这种方法对迭加噪声、JPEG压缩、滤波、剪切、图像增强、马赛克等常见攻击具有很好的稳健性.Proposed was a method for embedded watermarks in digital images based on complex Hadamard transforms, whose transform coefficients are characterized by important half spectra property （HSP）. According to this half spectra property, a binary logo was embedded into the complex hadamard transform domain of an image. The watermarked images were recovered without original images. （7,4） Hamming code was used to encode the watermark to improve its robustness, and also embed its verified pattern into the complex hadamard transform domain of an image. Especially, the wa- termark recovery does not require the original image. The experimental results show that our scheme is robust to variety of attacks such as adding noise, PEG compression, filtering, cropping, image en- hancement and mosaic.

关 键 词：复Hadamard变换 数字水印 汉明编码 半谱特性 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]