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.
| Original language | English |
|---|---|
| Pages (from-to) | 1821-1829 |
| Number of pages | 9 |
| Journal | Signal processing |
| Volume | 89 |
| Issue number | 9 |
| Early online date | 1 Apr 2009 |
| DOIs | |
| Publication status | Published - Sept 2009 |
Keywords
- block artifact grid
- doctored image forensic
- grid mismatch
- JPEG compression