Image processing device and white balance adjustment device
US7593043B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 2005 |
| Grant date | Sep 22, 2009 |
| Priority date | — |
| Expiry date | Jun 15, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a white balance adjustment device that is capable of adjusting white balance by estimating a color of a light source with a high degree of accuracy, even for a scene in which an object such as a leaf is present. The white balance adjustment device divides a captured image into a plurality of blocks, and extracts a representative color difference (Tg, Ti) from each block, and a characteristic pixel (Tg0, Ti0) having a maximum color difference in each block. The white balance adjustment device calculates a light source color estimation vector from a representative value pixel and a characteristic pixel for each block, and estimates a convergence point of light source color estimation vectors of the plurality of blocks as the color of the light source used for the input image to adjust the white balance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.