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

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3 Author(s)
Qiumin Wu ; Sch. of Commun. & Inf. Eng., Shanghai Univ., Shanghai, China ; Shuozhong Wang ; Xinpeng Zhang

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 O(n2logn) , much lower than O(n4) 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.

Published in:

Signal Processing Letters, IEEE  (Volume:18 ,  Issue: 10 )