Image preprocessing method for processing nonuniform illumination of miner face image and coal surface

A technology for image preprocessing and uneven illumination, applied in image enhancement, image data processing, instruments, etc., can solve problems such as focusing on image boundary enhancement, and achieve the effect of enhancing image contrast, weakening the influence of illumination, and increasing adjustability.

Inactive Publication Date: 2012-10-24
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

This method focuses on image boundary enhancement, but is not sui

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  • Image preprocessing method for processing nonuniform illumination of miner face image and coal surface
  • Image preprocessing method for processing nonuniform illumination of miner face image and coal surface
  • Image preprocessing method for processing nonuniform illumination of miner face image and coal surface

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[0027] according to figure 1 The realization process of homomorphic filtering in the embodiment is carried out with the help of image processing software (such as matlab software) image 3 with Figure 4 Carry out illumination processing, the specific implementation is as follows:

[0028] (1) Convert the color image image 3 with Figure 4 Converted to a grayscale image, and take the logarithm of the grayscale image function, the formula is as follows:

[0029] z(x,y)=lnf(x,y)

[0030] Where f(x, y) is a gray-scale image function, z(x, y) is a function obtained by taking the logarithm;

[0031] (2) Perform center Fourier transform on the function z(x, y) to obtain the frequency domain function Z(u, v);

[0032] (3) Design a homomorphic filter function. The key point of the homomorphic filtering algorithm is the selection of the homomorphic filtering transfer function H(u, v). The illumination component and the reflection component are respectively controlled by the transfer function. ...

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Abstract

The invention discloses an image preprocessing method for processing nonuniform illumination of a miner face image and a coal surface. According to the image preprocessing method, by using a homomorphic filtering principle algorithm, illumination components are weakened and reflection components are enhanced, and meanwhile excessive inhibition to low frequency components is avoided. A homomorphic filtering function of the preprocessing method is used for separately processing the low frequency components and the high frequency components, and processing the low frequency components at different levels by segments, the inhibiting radius of the low frequency components is determined to be five pixel numbers according to the image filtering effect when the limiting frequency radius of the traditional low pass filter is five. The image preprocessing method has strong pertinence and remarkable effects to the processing of strong illumination influence in the miner face image and the coal surface.

Description

technical field [0001] The invention relates to the field of image preprocessing of an underground coal mine monitoring system, and relates to an image preprocessing method for processing uneven illumination of an underground image with low light intensity and enhancing image contrast. Background technique [0002] In the coal mine underground monitoring system, due to the complex environment in the coal mine roadway and the dark background, the illumination mainly comes from the lighting lamp, the brightness contrast between the light area and the backlight area is very large, and the strong flash of the CCD camera and other factors lead to uneven illumination of the image , seriously affecting the quality of image acquisition. For complex underground conditions, the collected images in the coal mine underground monitoring system must be fully preprocessed before they can be used for image analysis and recognition. The phenomenon of image uneven illumination mainly include...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 田子建贾旭芬
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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