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Image white balance method and camera device

A camera device and white balance technology, which is applied in the field of image white balance, can solve problems such as time-consuming and poor white balance adjustment effects, and achieve the effect of reducing the number of calculations, reducing the time of white balance, and reducing the time of white balance

Inactive Publication Date: 2016-11-30
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not work well with white balance adjustments
[0003] At present, the industry still uses a histogram stretching method (Color Histogram Stretching, CHS) for image white balance, but the sampling length span usually takes a value of 2 when statistical histograms are used, so it will take a lot of time to calculate the histogram of an original image

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  • Image white balance method and camera device
  • Image white balance method and camera device
  • Image white balance method and camera device

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Embodiment Construction

[0023] see Figure 1 to Figure 8 , an embodiment of the present invention provides an image white balance method 100, which includes the following steps:

[0024] Step S1: Take an original image, the original image represented by red (R), green (G) and blue (B) is as follows Figure 8 shown.

[0025] Step S2: if Figure 2 to Figure 4 As shown, the three color channels of R, G, and B of the original image are counted into a histogram respectively. The abscissa of the histogram in the figure indicates the gray level of each pixel, and the ordinate indicates the appearance of each pixel on the gray level. times or probabilities.

[0026] Step S3: if Figure 5 to Figure 7 As shown, the three color histograms of R, G, and B are extended by interpolation. as well as

[0027] Step S4: Adjust the color of the original image according to the extended R, G, and B color histograms to obtain a white-balanced image.

[0028] Wherein, in step S2, the virtual program of the statistica...

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Abstract

The present invention relates to an image white balance method, which includes the steps of: shooting an original image; counting the R, G, and B color channels of the original image respectively into a histogram, and the sampling length spanm of the statistical histogram satisfies spanm=min{( 2h,H),(2w,W)}, where H represents the height of the original image, W represents the width of the original image, h=[log2H]+1; w=[log2W]+1, [] represents the Gaussian symbol operation, () means the greatest common factor operation, min{} means to take the smaller one; extend the R, G, B histogram; and adjust the original image according to the extended R, G, B three color histograms color to get a white balanced image. The invention also relates to a camera device, which includes a lens, an image sensor and an image processing module. The image processing module includes an automatic white balance circuit, and the automatic white balance circuit executes the above-mentioned image white balance method.

Description

technical field [0001] The invention relates to image white balance, in particular to an image white balance method and an imaging device adopting the image white balance method. Background technique [0002] Human eyes can automatically correct the color they see under different color temperatures, so even if the object is under different light sources, the color of the object seen remains roughly the same. This phenomenon of maintaining the same color performance under different lighting is called color constancy. However, the photosensitive component of the camera device does not have such a function. Therefore, automatic white balance is often used to estimate the light source parameters at that time with limited image information to adjust the image color without knowing the light source parameters. However, this method does not work well for white balance adjustment. [0003] At present, the industry still uses a histogram stretching method (Color Histogram Stretchin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/73H04N9/04
Inventor 林国宏
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD