期刊
SIGNAL PROCESSING
卷 89, 期 9, 页码 1821-1829出版社
ELSEVIER
DOI: 10.1016/j.sigpro.2009.03.025
关键词
Doctored image forensic; JPEG compression; Block artifact grid; Grid mismatch
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. (C) 2009 Elsevier B.V. All rights reserved.
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