Method and apparatus for identifying an imaging device
US7616237B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2006 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Jan 4, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V20/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A new technique for identifying whether images are derived from a common imager, e.g., a camera, or other imaging device such as a scanner, based on the device's measured or inferred reference noise pattern, a unique stochastic characteristic of all common digital imaging sensors, including CCD, CMOS (Foveon™ X3), and JFET. The measured or inferred noise pattern of two images may be extracted and then cross correlated, with a high correlation being consistent with a common imager. Various preprocessing techniques may be used to improve tolerance to various types of image transform. It is also possible to perform the analysis without explicit separation of inferred image and inferred noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.