System and method for color normalization of board images
US6570612B1 · kind B1 · utility
53Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1998 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Sep 21, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method are provided to normalize colors in an image of a board surface so as to eliminate effects of variable illumination, and in the case of mosaic images, to eliminate visible seams between tiles. Each pixel is classified as foreground or background, where foreground pixels contain ink marks. An efficient smoothing process estimates the ideal background color of all pixels, including the foreground pixels. The estimated background color is used to normalize each pixel's color such that in the final image, artifacts arising from camera gain and uneven lighting of the board surface are eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.