Flexible color space selection for auto-white balance processing
US8605167B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2010 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Nov 21, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Various techniques are disclosed for processing statistics data in an image signal processor (ISP). In one embodiment, a statistics collection engine may be configured to acquire statistics relating to auto white-balance. The statistics collection engine may receive raw Bayer RGB data acquired by an image sensor and may be configured to perform one or more color space conversions to obtain pixel data in other color spaces. A set of pixel filters may be configured to accumulate sums of the pixel data conditionally based upon YC1C2 characteristics, as defined by a pixel condition per pixel filter. Depending on a selected color space, the pixel filters may generate color sums, which may be used to match a current illuminant against a set of reference illuminants with which the image sensor has been previously calibrated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.