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White block hypothesis based automatic white balance method of digital camera device

A technology of automatic white balance and digital photography, applied to color signal processing circuits, etc., can solve the problems of inaccurate white balance and lack of robustness, and achieve strong robustness, intuitive and simple implementation method, and high accuracy Effect

Active Publication Date: 2015-05-13
HUNAN GOKE MICROELECTRONICS
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Problems solved by technology

[0017] It can be seen that the white block assumption algorithm has a certain risk in extracting max(R, G, B) in the case of rich colors, which will lead to inaccurate white balance
And due to the existence of noise, the algorithm based on specific pixels is not robust

Method used

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  • White block hypothesis based automatic white balance method of digital camera device
  • White block hypothesis based automatic white balance method of digital camera device
  • White block hypothesis based automatic white balance method of digital camera device

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Embodiment Construction

[0037] Such as figure 1 Shown, the inventive method flow process is as follows:

[0038] 1): Calibrate multiple color temperatures (color temperature, which is a scale representing the light color of the light source, and the unit is K (Kelvin). Color temperature has important applications in photography, video, publishing and other fields. The color temperature of the light source is determined by comparing its color and theory The thermal black body radiator is determined. The Kelvin temperature when the thermal black body radiator matches the color of the light source is the color temperature of that light source, which is directly related to Planck’s black body radiation law) The white block range under the light source:

[0039] 1) Obtain standard white raw images under various color temperature light sources, and divide each image into M×N blocks.

[0040] 2) Calculate the R of each block, G, the mean value Gavg of B, Ravg, Bavg, and obtain current gain Rgain=Gavg / Ravg,...

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Abstract

The invention discloses a white block hypothesis based automatic white balance method of a digital camera device. The white block hypothesis based automatic white balance method comprises obtaining a raw image of a standard white color code plate through the digital camera device to be calibrated and dividing the obtained raw image into M*N division blocks; calculating average values of an R channel, a G channel and a B channel of every division block and obtaining the current gain; finding a definition area of the standard white under every color temperature; dividing an image to be corrected into M*N division blocks, determining whether the gain of every division block is contained in the definition area or not in turn and performing color correction on the integral image through a default value if the gain of any division block does not fall into the definition area range; accumulating the gain and the weight of the division blocks which fall into the definition area otherwise; dividing an obtained accumulated value by a weight value corresponding to every division block respectively to obtain the gain of the image to be corrected; achieving the automatic white balance correction through the gain. The white block hypothesis based automatic white balance method of the digital camera device is high in robustness and accurate in white balance.

Description

technical field [0001] The invention relates to an automatic white balance method for a digital camera based on a white block assumption. Background technique [0002] The wide application of digital camera equipment has made the camera function an indispensable core function in mobile terminals. With the updating and upgrading of product consumption concepts, users have higher and higher requirements for the quality parameters of camera functions in mobile terminals. Among them, white balance is an extremely important quality parameter in the camera function. White balance refers to the restoration of white objects by digital cameras. Its accuracy directly determines the color quality of the photos taken. , to adjust the sensitivity intensity of each color of the photosensitive material, so that the color can be restored to the color perceived by the human eye. At present, the white balance adjustment in the digital camera equipment is manually adjusted by the user accordi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/73
Inventor 张葵阳姜黎李淼秦刚
Owner HUNAN GOKE MICROELECTRONICS
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