Method and apparatus for correcting lens shading
US8406557B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 8, 2010 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | Jan 23, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A lens shading correction method and apparatus are provided for removing vignetting occurring in digital images due to lens shading. A white image captured by an image pickup device and an image pickup unit is separated into reference white images corresponding to color channels. A vignetting center having a maximum light intensity is estimated in each of the reference white images. Multiple reference segments on each of the reference white images are defined. A lens shading correction value corresponding to each pixel constituting the reference segments are calculated using a corresponding light intensity. A lens shading correction function corresponding to each reference segment is derived using a corresponding lens shading correction value. Vignetting of a general image received in a general image processing mode is removed, using the derived multiple lens shading correction functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.