Image filter, image filtering method and computer program
US7539352B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2005 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Aug 31, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/20032
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A first pixel group containing a pixel of interest, a second pixel group containing the first pixel group, and a third pixel group containing the second pixel group are defined. A first reference pixel value is calculated based on the first pixel group, and a second reference pixel value is calculated based on the third pixel group. The second pixel group is divided into two sub-groups with respect to the second reference pixel value. The sub-group containing the pixel of interest is selected as a target set. In the target set, a pixel with a pixel value close to the first reference pixel value is selected as a corrective pixel. The pixel value of the pixel of interest is replaced with the pixel value of the corrective pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.