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Color constancy method in two steps under complex illumination

A color constancy and complex technology, applied in image data processing, instrumentation, computing, etc., can solve problems such as color constancy and physical model ill-fitting, achieve complete and clear details, good visual effect, and improve contrast and brightness

Inactive Publication Date: 2010-12-29
赵全友 +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

The traditional physical model of color constancy mixes color information and brightness information, thus forming an ill-posed problem in the physical model of color constancy

Method used

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  • Color constancy method in two steps under complex illumination
  • Color constancy method in two steps under complex illumination
  • Color constancy method in two steps under complex illumination

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0013] For most pictures, edge automatic white balance can be used for white balance processing, but when there are large-scale colored textures in the image, the white balance will fail because the edges of the color texture dominate. So the specific process of the method proposed by the present invention according to step (1) and step (2) is as follows:

[0014] 1) Convert the original image to YCbCr space by using formula (1);

[0015] 2) Carry out Canny edge extraction and binarization on the Cb and Cr components respectively, and then use formula (2) to obtain the chroma edge;

[0016] 3) Use formula (3) to suppress the chromaticity edge, use formula (4) to obtain the pixels on both sides of the edge after morphological operation, and use formula (5) to multiply the original image to get the color edge;

[0017] 4) Calculate t...

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Abstract

The invention discloses a color constancy method in two steps under complex illumination, belonging to the technical fields of computer vision, image processing and pattern recognition. The invention provides a novel color constancy method in two steps according to principles that a human visual system has independent color passage and bright passage at early stage and visual information processing has modularity. The method comprises the following steps: firstly, utilizing pixels nearby edges to estimate color offset information of an original image, correcting color offset of a color-offset image through white balance; and secondly, according to the color relativity characteristic of three components in an RGB color space, performing same proportion enhancement on the three components of RGB of a color image through obtaining a bright gain curved surface to finally obtain a color image with unchanged color. The method of the invention solves the mal posed problems of traditional color constancy, can preferably maintain the constancy of color under color offset, low luminance and other complex illumination, can effectively improve the contrast and brightness of the image simultaneously and has good universality.

Description

technical field [0001] The invention relates to a two-step color constancy method under complex illumination, and belongs to the technical fields of computer vision, image processing and pattern recognition. Background technique [0002] Color constancy is a characteristic of the human eye, which means that under different lighting conditions, people can generally correctly reflect the inherent color of the object itself. Visual recognition is more and more widely used in production and life, such as video surveillance, content-based image and video retrieval, and the most important thing is to solve the problem of color recognition. Since visual recognition mainly has three influencing factors, namely illumination, scene reflection performance, and sensor performance of the imaging system, one of the effects directly affected is the change of the spectral energy of the color, which makes the difference of the three RGB color channels collected. very big. Therefore, it is ...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 赵全友杜敏张淑军
Owner 赵全友
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