同幅数字图像中Copy-Move型篡改的盲检测  

Passive-Blind Detection of Copy-Move Forgery in One Digital Image

作　　者：何德龙[1] 倪林[1] 吴巧玲[1] 

机构地区：[1]中国科学技术大学信息科学技术学院,合肥230027

出　　处：《数据采集与处理》2013年第2期149-154,共6页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(61172157)资助项目

摘　　要：为了快速有效地检测复制-粘贴(Copy-Move)图像篡改,提出了一种基于重叠块统计值的Copy-Move型篡改图像盲认证方式。该算法先将图像进行一次离散小波变换(Discrete wavelet transform,DWT)并取其低频部分分解为重叠块,接着统计各重叠块的7个统计值并计算重叠块间的相似性找出相似块,最后返回原篡改图像找出篡改部分。仿真结果表明,该方法能快速有效地检测出篡改部分经过JPEG有损压缩、高斯白噪声污染和这两者结合的篡改图像。An efficient and robust algorithm is proposed for detecting and localizing Copy-Move forgery. Firstly, discrete wavelet transform （DWT） is applied to a tampered image, then the low-frequency component in wavelet sub-band is divided into overlapped blocks. Seven statis- tics of each block are calculated and lexicographically sorted so that duplicated blocks are iden-tified by searching for rows being closer to other rows after sorting. After finding out the du-plicated region in the wavelet sub-band, the duplicated region can be found in the tampered im-age. Simulation results show the efficiency of the proposed algorithm.

关 键 词：离散小波变换 复制-粘贴篡改 篡改检测 重叠块 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]