一种新的基于小波变换的自适应可视水印嵌入算法  

A New Visible Watermark Embedding Algorithm Based on DWT

作　　者：刘挺[1] 黄继风[1] 

机构地区：[1]上海师范大学数理信息学院,上海200234

出　　处：《计算机科学》2002年第9期66-68,142,共4页Computer Science

基　　金：上海教委科学技术发展基金(CL200009)

摘　　要：一、前言 随着当代信息技术的迅猛发展,各种数字化产品、电子出版物(图片、音频、视频、文本等)的发布变得日益流行,数字信息的复制也变得越来越简单.同时,伴随着Internet的日益普及,使得人们可以通过计算机网络传播多媒体资源而带来巨大的商业利润.It becomes more and more popular in the mordern life along with the growing of the Internet that people mostly choose network to publish their digital image products such as ichnography. So, it becomes a hot point of research that how to display the authority information clearly but cause no influence of enjoying the image at the same time. In this paper, we introduce an algorithm of embedding visible watermark. Through calculating the average value and difference value of the original image by 8×8 block, we adapt the watermark image according to the result to fit the luminance change of the original image.And, we use WT to embed the watermark image in low and high band differently to enhance the robustness. The algirithm could resist common image processing such as image transform.

关 键 词：自适应可视水印嵌入算法 小波变换 图像处理 水印图像 图像缩放 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN9[自动化与计算机技术—计算机科学与技术]