Image falsification detection device and image falsification detection method
US8387860B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 8, 2010 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Aug 12, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2201/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A falsification detection threshold value for falsification detection is automatically determined. A falsification detection portion (4) performs division into uniform detection units, and calculates, for each of the cells of the detection units, the variation information of differential information on respective regions that are included in the detection units and are divided as described above (S802). It is understood that cells (901), (902) and (903) have values of 8, 170 and 140, respectively. The falsification detection portion (4) uses the variations in the differential information calculated in step S802 to calculate a differential information threshold for determining a falsified region within an image read by scanning (S803). The average value and the standard deviation of a region where falsification is not conducted are relatively small, and the average value and the standard deviation of a region where falsification is conducted are relatively large.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.