Auto white balance apparatus and white balance adjusting method
US7705892B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 2005 |
| Grant date | Apr 27, 2010 |
| Priority date | — |
| Expiry date | Feb 25, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To provide an auto white balance apparatus and a white balance adjusting method capable of performing more stable white balance adjustment. For every block, a characteristic pixel determination circuit 106 determines a characteristic pixel from among a pixel group in a block and a light-source reflection determination circuit 108 determines whether the typical value of a block reflects the light source of an input image, by comparing the color difference of a characteristic pixel of the block with the typical color difference of the block. Then, as a result of the determination, a white balance evaluating circuit 110 determines the light source of an image by using blocks that reflect the light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.