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A method for enhancing contrast of a color image based on an LAB model

A color image and contrast technology, which is applied in the field of image processing, can solve the problems of small dynamic range, poor contrast, and poor visual effects of color images, and achieve the effect of improving the visual range, obvious effect, and improving visual effects

Active Publication Date: 2019-03-29
JIANGSU UNIV OF TECH
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Problems solved by technology

[0003] The main purpose of the present invention is to provide a method for enhancing the contrast of color images based on the LAB model, aiming at the problems of small dynamic range, poor contrast and poor visual effects of some color images

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  • A method for enhancing contrast of a color image based on an LAB model
  • A method for enhancing contrast of a color image based on an LAB model
  • A method for enhancing contrast of a color image based on an LAB model

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[0051]In order to make the technical solutions of the present invention clearer and clearer to those skilled in the art, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0052] Such as figure 1 As shown, the method for enhancing the contrast of a color image based on the LAB model provided in this embodiment includes the following steps:

[0053] Step 1: convert RGB image I to LAB space;

[0054] Step 2: Calculate the histogram H(i) of the brightness channel image L;

[0055] Step 3: Calculate p≥p 0 the corresponding h 0 ;

[0056] Step 4: Use array nw to record H(i)>h 0 The gray value of , the array length is n;

[0057] Step 5: find the position coordinate idx of the gray value on the image L sequentially from nw(1)-nw(n), and write the value imageout 1(idx)=d*x+a in the corresponding position of the output image imageout1, ...

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Abstract

The invention discloses a method for enhancing contrast of a color image based on an LAB model, and belongs to the technical field of image processing. The method includes the following steps: converting the RGB image I to LAB space, calculating the histogram H (i) of the luminance channel image L, calculating the h0 corresponding to p >= p 0, recording the gray value of H (i), sequentially finding out the position coordinates of the gray value on the image L, calculating the histograms of the color channel images A and B in LAB mode, and outputting the new luminance channel and the image in LAB mode and the color channel images. For low contrast images with small dynamic range, The method can be used for image processing software and video display terminal equipment to improve image visual range and visual effect due to the adjustable contrast and color saturation parameters. The method has the advantages that the image effect enhanced by the method is particularly obvious, and the fog removal effect is certain to the fog image.

Description

technical field [0001] The invention relates to a method for enhancing the contrast of a color image, in particular to a method for enhancing the contrast of a color image based on a LAB model, and belongs to the technical field of image processing. Background technique [0002] Image enhancement is one of the basic techniques of image preprocessing. It is mainly to increase the contrast of the image and improve the visual effect of the image. When the histogram of an image is at the low gray end and the dynamic range is relatively small, the method of improving the contrast is usually adopted. Logarithmic function processing; if the histogram is at the high gray end and the dynamic range is relatively small, the antilog function is generally used; for images with a small contrast dynamic range, no matter whether the gray histogram is at the high gray end or At the low gray level, the enhancement algorithm must be able to improve the sharpness and contrast of the image; base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/40
CPCG06T5/40G06T2207/10024G06T5/73
Inventor 章怡王海峰范鑫
Owner JIANGSU UNIV OF TECH
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