Method for chromatic adaptation of images
US7945094B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2008 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Dec 23, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6088
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for a chromatic adaptation transformation of images using temperature and tint space comprises the steps of: acquiring a red, green, blue (RGB) image using a camera (11); providing neutral RGB values for camera specific, and at least one of a selected highlight and shadow values, to produce a 3D lookup transformation table (21); calibrating the RGB image by applying the 3D lookup transformation table to produce a calibrated RGB image (22); calculating a Von Kries transform from specific temperature and tint values (14); and applying a chromatic adaptation to the calibrated RGB image using the Von Kries transform to produce a modified RGB image chromatically adapted (15), while maintaining neutral RGB values for highlight and shadow regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.