A white balance method and device

Abstract

The present invention provides a white balance method and device, the method includes the following steps: firstly receive the RGB data stream, and calculate the red gain and blue gain of the pixels in the data stream; then calculate the average red gain and the blue gain of all skin color points The average blue gain; then map the average red gain and average blue gain to the skin color characteristic color temperature curve to determine the color temperature value of the current environment; then map the current environment color temperature value to the ideal white point characteristic color temperature curve to determine the ideal red color The gain value and the ideal blue gain value; then according to the determination of the ideal red gain value and the ideal blue gain value, the white balance correction is performed. The present invention adopts the white balance method of mapping the skin color feature to the characteristic color temperature curve of the ideal white point, which can completely eliminate the interference of the skin color to the white balance, and effectively solve the problem of color cast in large-area skin color photographing pictures.

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. Traditional gray-scale world white balance or white spot method white balance algorithms can easily mistake skin tones as white points under certain color temperature conditions, resulting in white balance calculation errors. 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. However, in some special scenes, the remaining image information after the skin color point is subtracted basically has no white point. In this case Existing algorithms will count some pixels that are too dark or too bright as normal white points, causing th...

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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