Passive detection of doctored JPEG image via block artifact grid extraction

Weihai Li*, Yuan Yuan, Nenghai Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)1821-1829
Number of pages9
JournalSignal processing
Issue number9
Early online date1 Apr 2009
Publication statusPublished - Sept 2009


  • block artifact grid
  • doctored image forensic
  • grid mismatch
  • JPEG compression

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