Method and apparatus for automatic white balance

Abstract

A method of automatic white balance for an image capture system is disclosed. The automatic white balance mechanism ascertains the illuminant source of an image by analyzing the number of white pixels within a predefined white area in a color space diagram. The automatic white balance mechanism also determines gain adjustments based on the evaluating the average RGB values to achieve white balance.

Description

technical field [0001] The invention relates to an automatic white balance mechanism in an image acquisition system, which uses an automatic white balance algorithm to determine the light source of the image and adjust the gain of each color channel to obtain an equivalent Red (R), green (G), blue (B) values. When the RGB values ​​are equivalent and achieve white balance, the white object in the image will appear white even under different light sources. Background technique [0002] The human visual system is adapted to transform light sources by ensuring that white objects appear white. When a white object moves from sunlight with more blue light components to incandescent light with more red light components, the human visual system will make adjustments to balance the components of red, green, and blue light to ensure that the white object can It appears white in incandescent light. The technique of balancing red, green and blue light components is called white balanc...

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Problems solved by technology

[0008] In addition, the above methods cannot be used to determine the illuminant source of the image, because a single white area of ​​all types of illuminant sources does not have enough information to support further analysis to obtain an equivalent illuminant source

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