Automatic white balance method and device
An automatic white balance and white balance technology, applied in the direction of color signal processing circuits, etc., can solve the problems of unavailable light source for determining the image, long adjustment process of color gain value, and lack of fast response ability for light source changes , to achieve good color temperature estimation and improve system flexibility
Active Publication Date: 2008-04-23
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0006] The disadvantage of using a single white pixel criterion is that it cannot be used to determine the illuminant source of the image, because a single white pixel criterion for all types of illumination sources does not have enough information to support further analysis to obtain an equivalent illuminant source
In addition, the above method does not have a fast response to the change of the light source, because the adjustment process of the color gain value will be very long
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[0029] Such as figure 1 Shown is a schematic flow chart of the automatic white balance method of the present invention.
[0030] First, in step 101, the current image captured by the image capture device is divided into pixel blocks, such as m*m pixel blocks, wherein the selection of m depends on the height and width of the image, which is understood by those skilled in the art What is familiar is that each pixel block includes one or more pixel points. Such as figure 2 Shown is an example of dividing a captured image into 64 (8*8=64) blocks.
[0031] Then, enter step 102, and respectively calculate the average value of R, G, and B of the pixels contained in each pixel block obtained by segmentation.
[0032] In step 103, the color space of each pixel block is linearly transformed from (R, G, B) into a space composed of a brightness signal (Y) and two color difference signals (Cb, Cr), namely (Y, Cb, Cr). In one embodiment, the linear conversion relationship can be repre...
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The invention can eliminate color distortion of object caused by that the image contains object with bulk of high saturation, and can adjust yield value of white balance of three base color components: red, green, and blue under each condition of light source. The method includes steps: dividing the captured image into pixel block; determining light emitting source of the image; the step for iterative computing yield value of white balance is in use for obtaining a suitable yield value of white balance; using the said suitable yield value of white balance to carry out adjustment of white balance for pixel points in entire image. The device for automatic white balance includes the image segmentation module, the module for determining light emitting source of image, the module for iterative computing yield value of white balance, and the image correction module.
Description
technical field [0001] The invention relates to a fast iterative automatic white balance method based on prior knowledge. The invention also relates to a device for realizing the automatic white balance method. Background technique [0002] The human visual system is capable of shifting light sources by ensuring that white objects appear white. Under different light source environments, the intensities of the three primary color components of red, green, and blue vary greatly, and the blue component in sunlight is more than that in cool white fluorescent light. The human visual system balances the components of red, green, and blue light to ensure that white objects appear white in both daylight and fluorescent light. This technique is called white balancing. The automatic white balance device in the image acquisition system uses the automatic white balance algorithm to simulate the human visual system, so as to reproduce the true white of the white object in the image in...
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Inventor 罗小伟冯晓光林福辉
Owner SPREADTRUM COMM (SHANGHAI) CO LTD