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

页码：559 / 562

页数：4

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