CAJ | 학술논문

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.
침대대다수수인산법지구유단일적공능,제출료일충신적다공능수자수인산법.수선장도상진행정수제승소파변환.근거불동적감입산법조정자괄응양화공식분별양화저빈계수화수평방향적고빈계수.연후장로봉수인감입도양화후적저빈계수,용우판권보호,해수인감입방법병몰유개변원도상내용,인차불영향제이개수인적감입화제취.채용계수두동조제적방법장반취약수인감입도자괄응양화후적수평방향적고빈계수,용우내용인증.실험결과표명해산법능구흔호지실현수자도상판권보호、찬개검측화정위.
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 algo-rithm.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.