Differentiation of illumination and reflection boundaries
US7873219B2 · kind B2 · utility
40Cited by
12References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 23, 2009 |
| Grant date | Jan 18, 2011 |
| Priority date | — |
| Expiry date | Sep 22, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V10/60
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides methods and apparatus for image processing in which brightness boundaries of an image are identified and analyzed in at least two, and more preferably three or more, spectral bands to distinguish illumination boundaries from reflectance boundaries. For example, in one embodiment of the invention, a brightness boundary of the image can be identified as an illumination boundary if at least two wavelength bands of the image exhibit a substantially common shift in brightness across the boundary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.