一种图像篡改可恢复的认证水印方法  

Restorable Authentication Watermark Method for Image Tampering

作　　者：黄良永[1] 

机构地区：[1]柳州师范高等专科学校数学与计算机科学系,广西柳州545004

出　　处：《计算机工程》2011年第5期175-178,共4页Computer Engineering

基　　金：广西教育厅科研基金资助项目(200911MS294);柳州师专基金资助项目(LZSZ010004)

摘　　要：针对数字图像的篡改恢复问题,提出一种自嵌入的脆弱认证水印方法。提取图像2×2分块的灰度均值,经混沌映射加密、嵌入位平面确定和自同构映射后,作为水印信息嵌入原始图像所有像素的2个最低有效位中。该方法在图像认证时无需原始图像和任何有关水印的附加信息,可实现对细小图像篡改的准确检测定位并恢复到图像分块。实验结果与分析表明,该方法对任意的篡改极其敏感,恢复图像质量较好,安全性能较高。Aiming at the image tamper restore problem,this paper proposes a self-fragile authentication watermark embedding method.The method extracts the image sub-block size of 2×2 gray mean by chaotic encryption mapping to determine the embedded bit-plane and the automor-phism mapping information as a watermark,embeds it into the original image for all pixels in the two least significant bit.This method does not need any original image and additional information relating to a watermark,it can implement the exact detection and location of small image tampering and restore it to the image sub-block.Experiment and analysis show that the method of arbitrary tampering with extremely sensitive to restore image quality and better safety performance.

关 键 词：认证水印 图像认证 篡改定位 篡改恢复 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]