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Method for correcting automatic white balance

A technology of automatic white balance and correction method, applied in the direction of color signal processing circuit, etc., can solve problems such as color cast, and achieve the effect of correct image

Inactive Publication Date: 2010-10-27
SERVICE & QUALITY TECHNOLOGY CO LTD
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Problems solved by technology

[0010] In the color space, there is a problem of overlap between the color gamuts of different light sources. The falling points of these overlapping color gamuts will cause misjudgment as other light sources and cause color shift. The present invention then adjusts the falling points of the overlapping areas Appropriate weighting to account for possible color casts

Method used

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  • Method for correcting automatic white balance

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Embodiment Construction

[0031] The present invention is also an automatic white balance developed on the basis of the general gray world (GrayWorld) assumption. It first proposes a preset gain value for all light sources, from the preset light source gain value and the preset white ( Gray) area, using linear combination to form a new gain value. From the commonly used color space diagram, it can be known that the color gamuts of different light sources overlap, so it is easy to cause misjudgment of the light source, and cause color shift when adjusting the color through the gain value used later, so the present invention can also pass Adjust the weight ratio to correct the misjudgment area of ​​light source overlap, so that some error-prone parts can be corrected back.

[0032] see image 3 The color space reference diagram utilized by an embodiment of the present invention, the color space shows the relationship between the proportions of red, green, and blue colors in each pixel of an input image,...

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Abstract

The invention discloses a method for correcting automatic white balance. The method comprises the following steps of: calculating color values of each pixel in an input image by using a preset gain value; then obtaining a new gain value by using the linear combination after calculating the number dropped in a special gray area within a color space; and in order to solve the possible problem of color cast caused by gamut overlapping, correcting points of positions of the repeated areas in the color space through certain proportion so that the image output by the automatic white balance is more correct. Therefore, users also can determine the effect on the color cast of the image by adjusting the preset gain value.

Description

technical field [0001] The present invention is an automatic white balance correction method, especially using the number of each gray area in the color space to obtain a new white balance gain value through linear combination to output more correct images. Background technique [0002] Under different light sources, the human eye can adapt to the light source and automatically correct it, so that white objects still appear white. However, digital video recording devices, such as digital cameras and digital cameras, only faithfully present the proportion of reflected light from objects, so in greenish Under fluorescent lamps, white objects will have a green tint, while under yellowish street lights, they will have a yellow tint. Although the human eye is not able to completely correct white objects as white under all light sources, digital video recording devices will cause serious chromatic aberration problems. Automatic white balance (AWB) was developed to solve this probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/73H04N9/64
Inventor 张仲皓
Owner SERVICE & QUALITY TECHNOLOGY CO LTD
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