White balance method and device

A white balance and averaging technology, which is applied to TVs, color TV parts, electrical components, etc., can solve problems such as cumbersome steps, complicated operations, and white balance errors, and achieve the goals of simplifying the algorithm process, improving execution efficiency, and intelligent equipment Effect
CN105681775AActive Publication Date: 2016-06-15FUZHOU ROCKCHIP SEMICON
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUZHOU ROCKCHIP SEMICON
Publication Date
2016-06-15

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Abstract

The invention provides a white balance method and device. The method includes the following steps of: firstly receiving an RGB data stream, and calculating red gain and blue gain of pixel points in the data stream; then calculating average red gain and average blue gain of all the skin color points; mapping the average red gain and the average blue gain to a skin color characteristic color temperature curve, and determining the color temperature value of a current environment; mapping the color temperature value of the current environment to an ideal white point characteristic temperature color temperature curve, and determining an ideal red gain value and an ideal blue gain value; and performing white balance correction according to the ideal red gain value and the ideal blue gain value. The white balance method in which skin color characteristics are mapped to the white point characteristic color temperature curve is employed, the interference of the skin color to the white balance can be fully removed, and the problem that large area skin color photograph pictures have color bias is solved.
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Description

technical field

[0001] The invention relates to the field of computer image processing, in particular to a white balance method and device. Background technique

[0002] The imaging process of the image is mainly affected by three factors: the light source, the reflection coefficient of the object, and the spectral response function of the camera module. The traditional grayscale world white balance or white spot method white balance algorithm is easy to mistake the skin color as a white point under certain color temperature conditions, resulting in wrong white balance calculation. In order to solve this problem, people have added face recognition or skin color recognition to remove the interference of skin color on white balance. The existing algorithm will count some pixels that are too dark or too bright as normal white points, resulting in deviations in the color of photos taken when taking selfies or close-ups of people, and the skin color on the image cannot be restor...

Claims

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