Method for detecting fissure on surface of subway tunnel

A detection method and technology for surface cracks, applied in the field of rail transit, can solve problems such as small edge spacing, and achieve the effect of improving accuracy

Active Publication Date: 2014-06-04
北京协同创新轨道交通研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For small cracks, the distance between two crack edges represented by pixels is very small, and there will be a large error in the minimum distance method

Method used

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  • Method for detecting fissure on surface of subway tunnel
  • Method for detecting fissure on surface of subway tunnel
  • Method for detecting fissure on surface of subway tunnel

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Experimental program
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Embodiment 1

[0025] figure 1 It is a schematic diagram of a method for detecting cracks on the surface of a subway tunnel provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the method mainly includes the following steps:

[0026] Step 11. Using a vision system composed of high-speed area array cameras, high-speed image acquisition is performed on the surface of the subway tunnel cavity.

[0027] In the embodiment of the present invention, a vision system installed on a rail car or an electric passenger car is used together with strong light photos to collect high-quality images of the surface of the subway tunnel body.

[0028] Step 12. Perform preprocessing on the collected image to obtain a binarized image.

[0029] In the embodiment of the present invention, grayscale erosion processing is performed on the collected image to obtain a contrast-enhanced grayscale image; then, local histogram stretching processing and local Otsu (Otsu algorithm) segmentation a...

Embodiment 2

[0036] In order to facilitate understanding of the present invention, below in conjunction with Figure 2-6 The present invention will be further described. Such as figure 2 As shown, the detection method of a kind of subway tunnel surface crack that the embodiment of the present invention provides mainly comprises following 1-4 steps:

[0037] 1. High-speed acquisition of tunnel images.

[0038] In the embodiment of the present invention, a vision system composed of a high-speed area array camera is used to collect high-speed images on the surface of the subway tunnel cavity. The vision system can be installed on rail cars or electric passenger cars to realize fast-moving image acquisition, and obtain high-quality tunnel images with strong lighting.

[0039] 2. Tunnel image preprocessing.

[0040] The preprocessing described in the embodiment of the present invention mainly includes three steps: grayscale erosion, local histogram stretching and local Otsu (Otsu algorithm...

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Abstract

The invention discloses a method for detecting a fissure on the surface of a subway tunnel. The method for detecting the fissure on the surface of the subway tunnel comprises the steps that high-speed image acquisition is conducted on the surface of a subway tunnel body by means of a visual system formed by high-speed area-array cameras; an acquired image is preprocessed to enable a binary image to be obtained; the communication area of the binary image is calculated, multi-level filtering processing is conducted based on the communication area, and a tunnel surface image with irregular noise points which are irregularly distributed filtered out is obtained; detection of the fissure on the surface of the tunnel is conducted according to the tunnel surface image with the irregular noise points which are irregularly distributed filtered out, and the size of the fissure is calculated after the fissure is detected. By the adoption of the method for detecting the fissure on the surface of the subway tunnel, a complicated noise background can be eliminated effectively, and the fissure detection accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a method for detecting cracks on the surface of a subway tunnel. Background technique [0002] With the rapid development of domestic subway lines, the subway tunnel infrastructure built in the early days has entered the maintenance period, and the newly built subway tunnels will also induce deformation and cracks in the tunnel body, affecting the normal use of the tunnel and threatening driving safety. If the cracks in the subway tunnel body are not warned in time, the tunnel infrastructure will be further damaged, and once an accident occurs, it will bring huge losses to life and property. At present, the detection of cracks in subway tunnels mainly adopts the method of manual static inspection, supplemented by a small number of dynamic inspection vehicles, and is mainly carried out at night when there is no operation task on the line. This manual-based naked eye detectio...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06K9/54
Inventor 余祖俊王耀东朱力强郭保青白彪
Owner 北京协同创新轨道交通研究院有限公司
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