Invention Grant
- Patent Title: Automatic white balance methods and systems for electronic cameras
- Patent Title (中): 自动白平衡方法和电子照相机系统
-
Application No.: US14577242Application Date: 2014-12-19
-
Publication No.: US09307214B1Publication Date: 2016-04-05
- Inventor: Changmeng Liu , Chengming Liu , Jizhang Shan
- Applicant: OmniVision Technologies, Inc.
- Applicant Address: US CA Santa Clara
- Assignee: OmniVision Technologies, Inc.
- Current Assignee: OmniVision Technologies, Inc.
- Current Assignee Address: US CA Santa Clara
- Agency: Lathrop & Gage LLP
- Main IPC: H04N9/73
- IPC: H04N9/73 ; G06K9/46 ; G06T7/40

Abstract:
A brightness-sensitive automatic white balance method includes (a) determining the brightness of a scene captured in an electronic color image, (b) selecting a color-weighting map based upon the brightness of the scene, (c) extracting auto white balance parameters from the color-weighting map, and (d) white balancing the electronic color image according to the auto white balance parameters. An adaptive automatic white balance method includes (a) refining, based upon a first electronic color image of a scene illuminated by an illuminant of a first spectral type, a color-weighting probability distribution for the illuminant of the first spectral type, wherein the color-weighting probability distribution may be brightness-specific, (b) extracting auto white balance parameters from the refined color-weighting probability distribution, and (c) white balancing, according to the auto white balance parameters, an electronic color image of a scene illuminated by the illuminant of the first spectral type.
Information query