基于整数提升小波变换的多功能数字水印  

Multi-purpose digital watermark based on integer lifting wavelet transformation

作　　者：陈光喜[1] 尹柳[1] 易招师[2] 

机构地区：[1]桂林电子科技大学计算科学与数学学院,广西桂林541004 [2]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《计算机工程与应用》2010年第11期115-118,共4页Computer Engineering and Applications

基　　金：国家自然科学基金No.10501009;国家自然科学基金No.10661005;广西研究生教育创新计划资助项目(No.2008105950701M430)~~

摘　　要：针对大多数水印算法只具有单一的功能,提出了一种新的多功能数字水印算法。首先将图像进行整数提升小波变换,根据不同的嵌入算法调整自适应量化公式分别量化低频系数和水平方向的高频系数。然后将鲁棒水印嵌入到量化后的低频系数,用于版权保护,该水印嵌入方法并没有改变原图像内容,因此不影响第二个水印的嵌入和提取。采用系数抖动调制的方法将半脆弱水印嵌入到自适应量化后的水平方向的高频系数,用于内容认证。实验结果表明该算法能够很好地实现数字图像版权保护、篡改检测和定位。Due to the majority watermark algorithms have the sole function,this paper presents a novel multi-purpose digital watermark algorithm.At first,the image is transformed with the integer lifting wavelet,the coefficients of low frequency and the coefficient of horizontal high frequency are quantified using different quantitative formulas,which adjust to different embedding algorithm.Then,the robust watermark is embedded in the coefficients of low frequency to protect copyright;the original image content is hold,so it does not affect the second watermark embedding and extracting.The semi-fragile watermark is embedded in the coefficient of horizontal high frequency based on coefficient dither modulation to achieve the goal of content authentication.The experimental result shows this algorithm can realize copyright protection,tamper detection and localization well.

关 键 词：版权水印 认证水印 自适应量化 整数提升小波变换 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]