基于小波变换的数字水印稳定性与隐蔽性  

Digital Watermarking Hidden Stability Based on Wavelet Transform

作　　者：唐林海[1] TANG Lin-hai （KaiLi University, Kaili 556001, China）

机构地区：[1]凯里学院,贵州凯里556001

出　　处：《电脑知识与技术》2011年第3期1597-1599,共3页Computer Knowledge and Technology

基　　金：贵州省教育厅自然科学项目（黔教科2008078）资助;凯里学院院级课题（Z1018）资助

摘　　要：为解决数字水印的稳定性与隐蔽性，提出一种基于JND门限的水印嵌入算法，将宿主图像的小波变换系数做基于门限值的修改，并将修改的系数的位置和修改参数作为密钥保存，由于小系数对图像处理产生的PSNR的影响，对PSNR的计算公式采用阈值化处理，在提高水印嵌入冗余的同时保证水印的隐蔽性。考虑到灰度水印嵌入的水印信息量大，通过合理设计强度因子．在基本不影响水印透明性的情况下最大化嵌入水印的强度和信息量。In order to solve the stability of digital watermarking and hidden, JND threshold is proposed based on the watermark embedding algorithm, The host image wavelet coefficients do change based on threshold, And to modify the position of the coefficient as a key save and modify the parameters, Image processing due to the small coefficient on the impact produced by PSNR, PSNR is calculated on the threshold of treatment with, Increased redundancy in the watermark embedding while ensuring the invisibility of the watermarko Taking into account the gray watermark embedding large amount of information, Intensity factors through the rational design, Does not influence the watermark in the case of transparency to maximize the strength and amount of information embedded watermark.

关 键 词：水印 稳定性 失真 

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]