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Method and device for automatic white balance processing of the image

An automatic white balance and white balance technology, applied in the field of image processing, can solve problems such as inability to apply, and achieve the effect of convenient and flexible use

Inactive Publication Date: 2008-06-04
BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The disadvantage of the above-mentioned method in the prior art is: this method requires the standard white point in the image as a reference object to perform white balance adjustment processing on the image
In practical application, it brings some inconvenience to users
For example, this method cannot be applied when there is no standard white point in the image

Method used

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  • Method and device for automatic white balance processing of the image

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Embodiment Construction

[0022] The present invention provides a method and device for performing automatic white balance processing on an image.

[0023] The present invention is described in detail below with reference to the accompanying drawings. The processing flow of the embodiment of the method of the present invention is as follows: figure 1 shown, including the following steps:

[0024] Step 1-1. Determine the Y, Cr, and Cb values ​​of the color reference point at different color temperatures.

[0025] In practical applications, there are four common light sources, namely fluorescent lamps, incandescent lamps, sunny days, and cloudy days, corresponding to 4 different color temperatures, namely: 4200, 2700, 5500 and 7500.

[0026] The present invention is first based on the definition of gray:

[0027] R=G=B (1)

[0028] Cr=Cb=0 (2)

[0029] In the Y, Cr, Cb color space, the Y, Cr, and Cb values ​​of the 6 standard gray values ​​on the grayscale test card below the above 4 different color ...

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Abstract

The invention discloses a method for automatically processing white balance of image and a device thereof. The method mainly includes the following steps: a color reference point setting in color space and a color representative point in image are determined; the color representative point and the color reference point are compared in the position information of the setting color space and color temperature of the image is determined according to the result of the comparison; and according to the color temperature, the image is adjusted and processed by the white balance. The device mainly includes a reference point determining module, a representative point determining module, a color temperature determining module and a color component adjusting module. By using the invention, white balance adjustment of image can be automatically performed without depending on a standard white point in the image.

Description

technical field [0001] The present invention relates to the field of image processing, in particular to a method and device for performing automatic white balance processing on an image. Background technique [0002] CMOS (complementary metal-oxide semiconductor, complementary metal-oxide semiconductor) image sensors have gained more and more extensive applications due to their small size, low power consumption, low cost and high integration, occupying a large proportion of the middle and low end. market. [0003] In a CMOS image sensor system, the real colors in the same image scene will show different colors under different light sources. This is because different light sources have different spectral distributions, so that objects in the image scene may show different colors. A color different from its true color. The white color is most obviously affected by the above-mentioned different light sources. Therefore, in order to ensure the true reproduction of colors in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/73
Inventor 王超银李志纬袁红星
Owner BEIJING SUPERPIX MICRO TECHNOLOGY CO LTD
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