一种用于图像认证的半脆弱数字水印算法  

A semi-fragile Watermarking Algorithm for Authenticating the Visual Content of Digital Images

作　　者：魏伟一[1] 张贵仓[1] 秦娜[1] 

机构地区：[1]西北师范大学数学与信息科学学院,甘肃兰州730070

出　　处：《计算机仿真》2008年第7期121-124,共4页Computer Simulation

摘　　要：数字水印作为数字媒体版权保护的有效办法之一,近年来越来越为人们所重视。新型的基于CDMA调制可以进行图像认证的半脆弱数字水印算法。首先利用混沌序列生成的规格化序列将二值水印数据进行加密并扩频调制后嵌入到图像的DWT低频域,检测时利用规格化序列的特性不仅有效实现了盲检测,又实现了图像内容认证和图像的篡改定位。实验结果表明,算法对JPEG有损压缩、滤波和噪声等水印攻击显示出较强的鲁棒性。As an effective way for protecting copyright of digital media,watermark is receiving more and more attention.This paper proposes a new semi-fragile watermarking algorithm for authenticating the visual content of digital images based on CDMA modulation.The algorithm maps the watermark data using standardized sequence stemmed from chaotic sequence and embeds them in the lowest frequency domain of wavelet transform,which realizes not only blind detection but also authenticates the visual content of digital images and tampers localization effectively.Experimental results show that the proposed method is robust against JPEG compression,and attacks such as filtering and noise.

关 键 词：扩频调制 混沌序列 半脆弱水印 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]