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Color image enhancement method based on color constancy

A color constancy, color image technology, applied in image enhancement, image data processing, instruments, etc., to reduce time consumption, improve contrast and brightness, and enhance the effect of

Active Publication Date: 2012-06-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of method is time-consuming due to the need for color space conversion, which is not conducive to real-time image enhancement.

Method used

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  • Color image enhancement method based on color constancy
  • Color image enhancement method based on color constancy
  • Color image enhancement method based on color constancy

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Embodiment Construction

[0030] The technical scheme of the present invention can adopt computer software technology to carry out the process automatically. In order to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The embodiment of the present invention is to enhance the color image in the Simon Fraser University (SFU) image storehouse, refer to figure 1 , the process of the embodiment of the present invention includes the following steps:

[0031] Step a: Calculating an initial value of brightness gain, which is used for brightness enhancement.

[0032] To calculate the scale parameter , first convert the original color image into a brightness image, set a certain pixel in the original color image as the current pixel, and the corresponding brightness value of the current pixel in the brightness image is calculated by the following formula:

[0033]...

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Abstract

The invention relates to a color image enhancement method based on color constancy, which comprises the following steps: firstly, the brightness gain of each pixel is calculated in a self-adapting manner by utilizing a quadratic function according to the brightness mean value of the color images; secondly, the color gain and proportion parameter are calculated, the brightness gain effect is reinforced, and the color brightness is improved at the same time; and finally, margin specific information is extracted, the translational parameter is calculated, the enhanced image is subject to margin restoration, and the final color enhancement image is obtained through utilizing the proportion parameter and the translational parameter. According to the invention, under the condition of ensuring the color constancy, the contrast degree and brightness are effectively improved, the favorable specific integrity is maintained, better enhancement effect of images under various lighting conditions can be obtained, and preferable universality is realized.

Description

technical field [0001] The invention belongs to the technical field of image enhancement and relates to a color image enhancement method based on color constancy. Background technique [0002] Color image enhancement technology is helpful to improve people's visual perception and facilitate image understanding and analysis, so it is of great significance. Human vision has color constancy, which can eliminate the influence of lighting conditions on color to a certain extent, and correctly restore the inherent color of the object itself. Due to the need to keep some color information unchanged, traditional grayscale image enhancement techniques are not suitable for direct application to color images. [0003] Land et al. studied color constancy and proposed the Retinex model. Based on this, Jobson et al. developed single-scale Retinex (SSR), multi-scale Retinex (MSR) and multi-scale Retinex color restoration (MSRCR) methods, which were successfully applied to Image enhanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 刘军邵振峰
Owner WUHAN UNIV
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