一类数字图像篡改的被动认证  

Passive authentication of copy-move forgery in digital images

作　　者：魏为民[1] 王朔中[1] 唐振军[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《东南大学学报（自然科学版）》2007年第A01期58-61,共4页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(60372090);上海大学研究生创新基金资助项目(06820117)

摘　　要：在没有被嵌入水印也没有辅助信息可利用的前提下,针对一类特殊的图像篡改——复制遮盖篡改即遮盖的内容复制自同一幅图像中,提出一种基于小波分解的自相关检测方法.将图像划分为相互重叠的小块,提取每一个小块的小波分解低频子带作为特征向量,采用Pearson相关系数进行块相似性匹配检测.实验结果表明该方法能够抵抗图像复制部位的无缝处理,对一般的高斯噪声、低通滤波、JPEG压缩等噪声攻击具有较好的鲁棒性.Aiming at a special type of digital forgery——the copy-move attack in which a part of the image is copied and pasted somewhere else in the identical image, an autocorrelation detection method based on discrete wavelet transform is proposed without watermark and any auxiliary information. The image is divided into overlapped blocks and the 2-D wavelet transform is applied on each block. Extract the eigenvectors from the low frequency bands of each block and calculate their Pearson correlation coefficient to deject the similar blocks. The experimental results show that the proposed method can resist the image duplication seamless processing, and be robust to Gauss noise, low pass filter, JPEG compression.

关 键 词：数字水印 图像认证 篡改检测 被动认证 小波变换 

分 类 号：TN911.73[电子电信—通信与信息系统]