White balance control method and white balance control device

Abstract

The invention discloses a white balance control method and a white balance control device. The white balance control method includes a first step of defining reference points and a coordinate range in a corresponding color space, a second step of dividing observation areas of images according to some kind of rules, a third step of carrying out separate calculation to obtain chromaticity component statistic information of the reference points of the observation areas of two frames of continuous images, and a fourth step of analyzing the variation tendency of the chromaticity component statistic information of the reference points of the observation areas of two frames of images, and triggering a white balance regulation module when the variation tendency of the statistic information of the observation areas. The white balance control method and the white balance control device are capable of well distinguishing changes of a scene and changes of the color temperature of a light source and preventing white balance regulation failure through an introduced protection mechanism. Experiment results show that compared with other methods, the white balance control method can enable white pieces not to generate color cast to the maximum extent under the same testing environment.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a white balance control method and device thereof. Background technique [0002] The purpose of white balance is to adjust the chromaticity gain of the image by taking the image illuminated by a light source with a certain color temperature as the target value, and eliminate or weaken the influence of the scene light source on the image quality when the scene light source changes in different color temperatures, so that the image quality is as close as possible to the target color temperature. Consistent under light source illumination. [0003] It is not difficult to see that the essence of white balance control is to track the change of the color temperature of the light source, and dynamically adjust the chroma gain of the image according to this change value. In practical applications, in addition to the fact that the scene light source may change at different color...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a simple and feasible white balance control method and its device, which can solve the problem of estimating the change of the color temperature of the light source in the scene by the mean value of the statistical information of the observation area commonly used in the current white balance control method, which may cause white The problem of balance failure, while improving the reliability of white balance adjustment, does not increase the computational complexity

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