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Control method and control device for starting white balance adjustment

A technology of a control method and a control device, which is applied in the field of control, can solve problems such as reducing the reliability of image quality caused by white balance adjustment, and the inability to accurately judge white balance adjustment, so as to achieve the effect of saving software and hardware resources and improving reliability

Active Publication Date: 2013-08-21
BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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Problems solved by technology

[0007] It can be seen that the existing technology judges whether the properties of the actual light source have changed based on the average chromaticity of the entire frame of the image, while ignoring other factors that cause the average chromaticity to change. Therefore, it is impossible to accurately determine whether to start white balance adjustment, reducing the Improved reliability of white balance adjustment for image quality improvement

Method used

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  • Control method and control device for starting white balance adjustment

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Embodiment Construction

[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0042] In the embodiment of the present invention, motion detection is firstly used to obtain background regions in two consecutive frames of images. Then, calculate the average chromaticity of the background area in two consecutive frames of images, considering that the average chromaticity of the background area is usually only affected by the nature of the actual light source, so when the chromaticity of the background area in two consecutive frames of images When the difference between the average values ​​is greater than or equal to the preset first threshold, it means that the chromaticity average value of the background area in two consecutive frames of images has changed significantly, so it can be determined that the nature of the actual light s...

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Abstract

The invention discloses a control method and a control device for starting white balance adjustment. The invention utilizes a motion detection to obtain background areas of two continuous frame images, respectively calculates colourity average value of the background areas in the two continuous frame images; if the difference of the colourity average value of the background areas in the two continuous frame images is larger than or equal to a preset first threshold value, the colourity average value of the background areas in the two continuous frame images changes obviously is shown; the colourity average value of the background areas in the two continuous frame images is generally influenced only by actual light source property, thus being capable of judging that the actual light sourceproperty changes and triggering the starting of the white balance adjustment. Therefore, when a moving object in the image has influence on the colourity average value of the whole frame image, misjudgment whether the actual light source property changes can be avoided, thus being capable of avoiding triggering the white balance adjustment when the color temperature of the actual light source doesnot change, also being capable of avoiding that the white balance adjustment is not triggered when the color temperature of the actual light source changes. Therefore, the invention can improve the reliability of the white balance adjustment.

Description

technical field [0001] The present invention relates to control technology, in particular to a control method for starting white balance adjustment and a control device for starting white balance adjustment. Background technique [0002] White balance adjustment refers to adjusting the chromaticity of the whole frame image based on the white color when the sunlight is used as the light source, and according to the deviation of the actual light source characteristics such as color temperature from the reference, so as to improve the image quality. [0003] In the prior art, it is usually judged whether the actual light source property changes by using the chromaticity average value of the whole frame of images. Every frame of image needs to start white balance adjustment. [0004] However, the change in the average chromaticity of the entire frame of image is not necessarily caused by the change of the actual light source properties; and even if the actual light source prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/73
Inventor 王浩
Owner BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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