Journal
IEEE SIGNAL PROCESSING LETTERS
Volume 18, Issue 10, Pages 559-562Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSP.2011.2163507
Keywords
Image forensics; pseudo log-polar transform; regional duplication detection; rotation and scaling invariance
Categories
Funding
- Natural Science Foundation of China [60872116, 60832010]
- Graduate Innovation Foundation of Shanghai University [SHUCX112111]
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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.
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