Log-Polar Based Scheme for Revealing Duplicated Regions in Digital Images

被引：34
|
作者：
Wu, Qiumin [1 ]
Wang, Shuozhong [1 ]
Zhang, Xinpeng [1 ]
机构：
[1] Shanghai Univ, Sch Commun & Informat Engn, Shanghai 200072, Peoples R China
来源：
IEEE SIGNAL PROCESSING LETTERS | 2011年 / 18卷 / 10期
关键词：
Image forensics; pseudo log-polar transform; regional duplication detection; rotation and scaling invariance; FOURIER-TRANSFORM; ROTATION;
D O I：
10.1109/LSP.2011.2163507
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Region duplication is a common type of digital image tampering. This paper presents a log-polar based approach to detect such forgery even if the copied area has been rotated and/or scaled. We compute log-polar fast Fourier transform (LPFFT) on image blocks to approximate the log-polar Fourier transform (LPFT). LPFFT is based on a nearly log-polar system where conversion to log-polar coordinates only involves 1-D Fourier transform and interpolation operations. In addition to rotation and scaling invariance, computation complexity of LPFFT is, much lower than O(n(4)) of LPFT when n is large. Similarity of the LPFFT results between different blocks provides indication of image tampering. Experimental results show efficacy of the proposed method.
引用
收藏
页码：559 / 562
页数：4
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