Image gray-world white balance adjustment method and device based on color temperature curve

Abstract

The invention discloses an image gray-world white balance adjustment method and device based on a color temperature curve. The method comprises the following steps: selecting a target image block in a target image, a first color component ratio and a second color component ratio of the target image block meeting function relationship of a preset color temperature curve; calculating gain coefficients of R, G, B three color channels of the target image through a gray world algorithm according to RGB values of all pixel points in the target image block; and adjusting color values of the target image through the gain coefficients. The gain coefficients of the R, G, B three color channels of the target image are calculated based on color information of the target image block instead of color information of the whole target image; and then, the color values of the target image are adjusted based on the gain coefficients, so that the color information of the adjusted image is basically same with the original color information, color distortion does not occur, and the method is better in applicability.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method and device for adjusting grayscale world white balance of an image based on a color temperature curve. Background technique [0002] Under the illumination of light sources with different color temperatures, the color of light reflected by the same object is different, resulting in different colors of the object. Generally, the original color of an object is defined as the color that the object presents under normal sunlight (color temperature is 5500K). [0003] The human eye has a certain degree of adaptability to the color temperature. Under the illumination of different light sources, the color of the object seen by the human eye has little deviation from the original color of the object. The photosensitive device of the camera is not self-adaptive. Therefore, under the illumination of light sources with different color temperatures, the color of th...

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Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a method and device for adjusting the grayscale world white balance of an image based on a color temperature curve, so as to solve the existing grayscale world white balance adjustment method for an image, which is used to adjust a large-area monochromatic area. When the image is displayed, it is prone to color distortion and poor applicability

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