White balance method and device

A white balance and white balance correction technology, applied in the field of image processing, can solve the problems of scene color cast and inaccurate white blocks, and achieve the effect of improving accuracy and avoiding tone distortion.

Active Publication Date: 2018-09-18
ZHEJIANG DAHUA TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Embodiments of the present invention provide a white balance method and device to solve the technical problem that the white bloc...

Method used

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  • White balance method and device

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Embodiment 1

[0062] An embodiment of the present invention provides a white balance method, which can be used to perform white balance processing on image data such as captured images and videos.

[0063] See figure 1 , the flow of the white balance method in the embodiment of the present invention is described as follows.

[0064] Step 101: According to the scene brightness of the image to be adjusted and the color temperature of each white block in the image to be adjusted, respectively adjust the white balance weight value of each white block, so that when the scene brightness of the image to be adjusted is higher than the first preset scene brightness, White blocks in different color temperature ranges have different adjustment degrees of white balance weight values. Among them, the white block is the image block used as the white balance adjustment reference in the image to be adjusted, and the white balance weight value is used to represent the color of the white block The weight of...

Embodiment 2

[0129] Based on the same inventive concept, an embodiment of the present invention provides a white balance device. See Figure 5 , the white balance device includes a weight adjustment module 501 , a white balance correction value determination module 502 and a white balance adjustment module 503 . in,

[0130] The weight adjustment module 501 is used to adjust the white balance weight value of each white block respectively according to the scene brightness of the image to be adjusted and the color temperature of each white block in the image to be adjusted, so that the scene brightness of the image to be adjusted is higher than the first predetermined value. When the brightness of the scene is set, the adjustment degree of the white balance weight value of the white blocks in different color temperature ranges in each white block is different. Among them, the white block is the image block used as the white balance adjustment reference in the image to be adjusted, and the w...

Embodiment 3

[0148] Based on the same inventive concept, an embodiment of the present invention provides a device, including:

[0149] at least one processor, and

[0150] memory coupled to at least one processor;

[0151] Wherein, the memory stores instructions executable by at least one processor, and at least one processor executes the method described in Embodiment 1 by executing the instructions stored in the memory.

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Abstract

The embodiment of the invention provides a white balance method and device. The method and the device are used for solving the problem that colour cast exists in a scene of an image after white balance adjustment due to the fact that white blocks determined when the white balance adjustment is carried out are inaccurate. The method comprises the steps of adjusting a white balance weight value of each white block according to scene luminance of a to-be-adjusted image and color temperature of each white block in the to-be-adjusted image, and assuming that the adjustment degree of the white balance weight values of the white blocks within different color temperature ranges in the white blocks is different when the scene luminance of the to-be-adjusted image is greater than first preset sceneluminance, wherein the white blocks are image blocks as white balance adjustment references in the to-be-adjusted image, and the white balance weight values are used for expressing weight of color channel values of the white blocks in white balance correction value calculation; determining white balance correction values through combination of the color channel values of the white blocks and the adjusted weight balance weight values of the white blocks; and carrying out white balance adjustment on the to-be-adjusted image according to the white balance correction values.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a white balance method and device. Background technique [0002] Due to the different spectral characteristics of different light sources, the hues of objects are different under light with different color temperatures. The higher the color temperature, the bluer the object, and the lower the color temperature, the yellower the object. [0003] The human eye has a unique adaptability to color temperature, so that we sometimes cannot find that the color temperature of the object is affected by the color temperature of the light source. If you suddenly change the fluorescent light to tungsten lighting, you will feel that the color of the white paper is yellowish, but this feeling can only last for a while. It can be understood that the human eye has the function of automatic white balance. [0004] However, compared with the human eye, the sensor in the camera lacks the ...

Claims

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Application Information

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IPC IPC(8): H04N9/73
CPCH04N9/73
Inventor 王振海况璐
Owner ZHEJIANG DAHUA TECH CO LTD
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