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Color constancy processing method based on single image

A color constancy and processing method technology, applied in the field of color constancy processing based on a single image, can solve the problem of low applicability

Active Publication Date: 2012-01-04
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Since this algorithm needs the assistance of reference color objects, the applicability of this algorithm is not high

Method used

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  • Color constancy processing method based on single image
  • Color constancy processing method based on single image
  • Color constancy processing method based on single image

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Embodiment Construction

[0067] As shown in Figure 1, first briefly summarize the steps of a color constancy processing method based on a single image in the present invention, assuming that the image size is N*M:

[0068] (1) Preliminarily process the image by using the median filter to eliminate the mutation pixels, thereby reducing the pressure of the MeanShift algorithm;

[0069] (2) Use the MeanShift algorithm to smooth the obtained two-dimensional digital image I, and process it to obtain I M ;

[0070] (3) Decompose the IM image to obtain the illumination estimation grayscale image I of the three color layers of the I image Rl , I Gl , I Bl ;

[0071] (4) Use the RGB three-color layer illumination estimation map obtained in step 3) to calculate the reflection component I of the three-color layer grayscale image Rr , I Gr , I Br ;

[0072] (5) will I Rr , I Gr , I Br The reflection components of the three color layers are combined to obtain image I r ;

[0073] (6) to I r The image...

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Abstract

The invention discloses a color constancy processing method based on a single image. The method comprises the following steps of: 1, primarily processing the image by using median filtering, and eliminating an abruptly-changed pixel point, so relieving pressure of a MeanShift algorithm during operation; 2, smoothing an acquired two-dimensional digital image I by using the MeanShift algorithm to obtain an image IM; 3, decomposing the image IM to obtain illumination estimation grayscale maps IR1, IG1 and IB1 of three chromatographs of the image I; 4, calculating reflection components IRr, IGr and IBr of the grayscale maps of the three chromatographs by using the illumination estimation maps RGB of the three chromatographs obtained in the step 3; 5, combining the reflection components IRr, IGr and IBr of the three chromatographs to obtain an image Ir; and 6, performing defogging on the image Ir to obtain an image Irf. By the method, the operation speed of the algorithm is increased, and a blocking effect of a filtered image is enhanced. A gray world theory processing method is adopted in a system, so nature color of the image can be restored better by the system.

Description

technical field [0001] The invention relates to the technical field of computer vision image processing, in particular to a method for processing color constancy based on a single image. Background technique [0002] In the field of computer vision, it is often necessary to obtain information related to visual processing from the obtained two-dimensional digital images, so as to make corresponding judgments and processing. Among them, computer vision algorithms based on the processing of object colors in images are widely used in this field. For example, the skin color extraction algorithm in the field of gesture recognition has high requirements for maintaining the essential color of objects in images. However, due to the fact that the photographed object is often in a relatively complex lighting environment, coupled with the distortion caused by the image sensor itself, the color of the two-dimensional digital image acquired by the computer through the sensor often changes...

Claims

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Application Information

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IPC IPC(8): G06T7/40
Inventor 徐向民翁俊武叶佳木
Owner SOUTH CHINA UNIV OF TECH