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A machine vision-based tunnel over- and under-excavation detection method and detector

A technology of machine vision and detection methods, applied in instruments, measuring instruments, measuring devices, etc., can solve the problems of low efficiency and high price of 3D laser scanners, and achieve low cost, easy deployment and use, and good effects.

Active Publication Date: 2021-11-09
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 3D laser scanners are expensive and not efficient

Method used

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  • A machine vision-based tunnel over- and under-excavation detection method and detector
  • A machine vision-based tunnel over- and under-excavation detection method and detector
  • A machine vision-based tunnel over- and under-excavation detection method and detector

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Experimental program
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Embodiment 1

[0028] see figure 1 , the present invention is based on machine vision tunnel over excavation detection method, the implementation steps are as follows:

[0029] Step S1: In front of the area to be inspected in the construction tunnel, a circular laser is used to shoot a circular laser line on the tunnel wall 1 of the area to be inspected as the marking line 3;

[0030] Step S2: Observing the shape of the marking line 3 through the camera (installed with the above-mentioned circular laser), adjusting the position and attitude of the camera so that the position of the camera is located on the vertical centerline of the tunnel cross section;

[0031] Step S3: using a linear laser to shoot a linear laser line 2 on one side of the tunnel wall, so that the linear laser line 2 and the marking line 3 are kept vertical;

[0032] Step S4: manually or automatically, move the linear laser line 2 from one side to the other along the tunnel wall, and keep the linear laser line 2 and the m...

Embodiment 2

[0036] see figure 1 , the machine vision-based tunnel overbreak and underbreak detection method in this embodiment differs from Embodiment 1 in that: in step S2, the process of judging and adjusting the position and attitude of the camera is as follows: if the shape of the marking line 3 If it is a left-right symmetrical circular arc, it means that the position of the camera is located on the vertical centerline of the tunnel cross section. Otherwise, it is necessary to manually or automatically adjust the position of the camera (together with the circular laser) until the circular laser is on the tunnel wall. The mark line 3 that hits on is the circular arc shape of left and right symmetry.

Embodiment 3

[0038] see figure 1 The difference between the machine vision-based tunnel overbreak and underbreak detection method of this embodiment and embodiment 1 or embodiment 2 is that in step S3, if the linear laser line 2 and the marking line 3 are not vertical state, adjust the angle of the linear laser manually or automatically to keep the linear laser line 2 and the marking line 3 in a vertical state.

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Abstract

The invention relates to a method and device for detecting over- and under-excavation of a tunnel. A machine vision-based tunnel over- and under-excavation detection method uses a circular laser to mark a circular laser marking line on the tunnel wall in front of the area to be detected in the construction tunnel, and uses a linear laser to mark a linear laser line on one side of the tunnel wall, and Hold said linear laser line perpendicular to the circular marking line; then, keeping the linear laser line perpendicular to the circular marking line, move the linear laser line from side to side along the tunnel wall, using a camera to record the trajectory of the linear laser line , and draw the 3D contour map of the tunnel wall according to these linear laser lines; then compare the 3D structural data of the tunnel wall in the area to be detected with the data in the tunnel design drawing to obtain the tunnel overbreak and underbreak situation. A tunnel overbreak and underbreak detector based on machine vision, including a circular laser, a linear laser, a camera and a processor. The realization process of the invention is simple, economical and effective, and can effectively reduce the construction cost.

Description

technical field [0001] The invention relates to a method and device for detecting over- and under-excavation of a tunnel. Background technique [0002] Tunnel overbreak and underbreak detection is very important in the process of tunnel construction. At present, the construction site mainly uses imported 3D laser scanners to measure the over- and under-excavation of the tunnel construction. However, 3D laser scanners are expensive and not efficient. [0003] Therefore, in order to better reduce the construction cost and ensure the quality of the project, it is necessary to propose an economical, simple and effective tunnel overbreak and underbreak detection method. Contents of the invention [0004] Aiming at the deficiencies in the prior art, the present invention proposes a machine vision-based tunnel overbreak and underbreak detection method, and proposes a machine vision-based tunnel overbreak and underbreak detector. The detection method and detector have high effic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C15/00
Inventor 崔立志杨艺李冰峰王科平李新伟余琼霞杨俊起卜旭辉王福忠费树岷
Owner HENAN POLYTECHNIC UNIV