Passive detection of doctored JPEG image via block artifact grid extraction

Authors:
Weihai Li;Yuan Yuan;Nenghai Yu
Affiliations:
MOE-Microsoft Key Laboratory of Multimedia Computing and Communication, University of Science and Technology of China, Hefei, Anhui 230027, China;School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK;MOE-Microsoft Key Laboratory of Multimedia Computing and Communication, University of Science and Technology of China, Hefei, Anhui 230027, China
Venue:
Signal Processing
Year:
2009

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Abstract

It has been noticed that the block artifact grids (BAG), caused by the blocking processing during JPEG compression, are usually mismatched when interpolating or concealing objects by copy-paste operations. In this paper, the BAGs are extracted blindly with a new extraction algorithm, and then abnormal BAGs can be detected with a marking procedure. Then the phenomenon of grid mismatch or grid blank can be taken as a trail of such forensics. Experimental results show that our method can mark these trails efficiently.