Method and device for realizing white balance correction
A white balance and correction parameter technology, applied in the field of image processing, can solve problems such as image distortion and poor image quality, achieve good image quality, good user experience, and avoid poor white balance correction effect
Inactive Publication Date: 2009-11-25
VIMICRO CORP
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[0005] The present invention provides a method and device for realizing white balance correction, so as to solve the problems of image distortion and poor image quality in the prior art because the influence of the light source is not considered.
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[0065] The main idea of the embodiment of the present invention is as follows: firstly, collect the color image generated when each light source irradiates a color material, and determine the color temperature curve on the chromaticity value space according to the chromaticity value of the pixel in the color image; Then, determine the chromaticity value of the pixel point in the image to be processed; again, according to the distance between the chromaticity value of the pixel point and the chromaticity value of each point on the color temperature curve, determine the corresponding value of each point on the color temperature curve Weight; finally, determine a weight that reaches the threshold, and perform white balance correction according to the chromaticity value of the point corresponding to the weight.
[0066] Below in conjunction with accompanying drawing, describe the present invention in detail,
[0067] As shown in Figure 1(a) and Figure 1(b), it is a device for re...
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The invention discloses a method for realizing white balance correction. The method includes: determining the color temperature curve on the chromaticity value space through training; determining the chromaticity value of the pixel point in the image to be processed; The distance between the chromaticity value and the chromaticity value of each point on the color temperature curve, determine the weight corresponding to each point on the color temperature curve; determine a weight that reaches the threshold, and perform white balance correction according to the chromaticity value of the point corresponding to the weight . Through the present invention, the distortion caused by mistakes caused by ignoring the influence of the current light source on the correction parameters during the automatic white balance process is avoided, and at the same time, the problem of being unable to identify mixed light sources is solved, and the white balance correction effect caused by the limited types of training light sources is avoided. The poor problem makes the image quality better and the user experience better. The invention also discloses a device for realizing white balance correction.
Description
technical field [0001] The invention relates to image processing technology, in particular to a method and device for realizing white balance correction. Background technique [0002] Video camera equipment such as digital video cameras and digital cameras generally include optical lenses, image sensors, image processing chips, image transmission modules, and image display modules. In fact, a color will appear different under the illumination of different light sources, for example, gray will appear yellow under the illumination of incandescent lamp, and it will appear cyan under the illumination of cold light. The human eye has the function of automatic adjustment, and can distinguish between gray and colored objects even under different light sources. However, the output color of the gray object after passing through the optical lens and image sensor is not necessarily gray. Experiments show that in A light The original image output by the illuminated gray object through ...
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IPC IPC(8): H04N1/60H04N9/73
Inventor 黄英沈操王浩
Owner VIMICRO CORP