White balance method and device

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.

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...

AI Technical Summary

Problems solved by technology

[0004] Therefore, it is necessary to provide a white balance technical solution to solve the problems of white balance errors, cumbersome steps, and complicated operations when the existing white balance algorithm processes the skin color block on the image.

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