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Measuring method of shield tunnel lining segment seam open width and apparatus thereof

A technology for lining segments and shield tunnels, applied in measuring devices, using optical devices, neural learning methods, etc., can solve problems such as inapplicability of identification measurement methods and impact on imaging quality

Inactive Publication Date: 2013-05-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual shield tunnel, light, occlusion, and various stains and scratches will seriously affect the image quality, making the recognition and measurement method for the ideal wide target object in the recent photo unsuitable, and it is necessary to find a suitable new one. method

Method used

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  • Measuring method of shield tunnel lining segment seam open width and apparatus thereof
  • Measuring method of shield tunnel lining segment seam open width and apparatus thereof
  • Measuring method of shield tunnel lining segment seam open width and apparatus thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Such as figure 1 As shown, a method for measuring the opening width of shield tunnel lining segment joints includes the following steps:

[0077] Step 101, using the computer vision toolkit HALCON calibration method to calibrate the camera to obtain the internal parameters of the camera;

[0078] Step 102, collect the image of the segment seam by a digital camera, and measure the shooting distance by a laser rangefinder. In this implementation, the shooting distance l is 0.681m;

[0079] Step 103, converting the acquired image into a grayscale image, and selecting a region of interest (Region Of Interest, hereinafter referred to as ROI) to be measured on the converted grayscale image;

[0080] Step 104, select appropriate filtering parameters, and use Gauss filter to smooth the ROI region image selected in (3);

[0081] Step 105, determine the maximum threshold 40 and the minimum threshold 20 of the smoothed image, and perform Canny hysteresis threshold segmentation ...

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Abstract

The invention relates to a measuring method of a shield tunnel lining segment seam open width and an apparatus thereof. The method comprises the following steps: using a computer vision kit to demarcate cameras, collecting segment seam images through the digital cameras and determining a shooting distance through a laser range finder; converting the collected images into grayscale images, selecting an appropriate filtering parameter and using a Gauss filter to smooth the images in a selected region of interest (ROI); determining a maximum threshold and a minimum threshold after the images aresmoothed and carrying out Canny lag threshold segmentation so as to obtain a sub-pixel linear characteristic of the images and a segment seam edge; screening needed sub-pixel segment seam edge imagesfrom the sub-pixel linear characteristic; using a normal vertical minimum distance method to respectively calculate a largest width and a mean width according to the obtained two sub-pixel segment seam edge images; determining a conversion proportion between a pixel dimension and an actual dimension according to a predetermined internal parameter of the cameras and calculating so as to obtain an actual width of the segment seam. The method and the apparatus have advantages of low costs and high precision. The method can be used rapidly and conveniently.

Description

technical field [0001] The invention relates to a shield tunnel lining segment joint measurement technology, in particular to a method and device for measuring the opening width of a shield tunnel lining segment joint. Background technique [0002] High-precision, high-efficiency, digital and automatic disease detection mode are the prerequisites for high-quality shield tunnel operation and maintenance. With the advancement of detection technology, the traditional method of measuring the segment seam width by human eyes or using simple instruments such as rulers, reading magnifiers, etc., due to the subjectivity of the results, the accuracy and efficiency The disadvantages such as lower, and the results are not easy to save and manage, will be gradually replaced by new methods. With the rapid development of computer technology and the continuous improvement of the quality of camera hardware, digital image technology has rapidly penetrated into various disciplines due to its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/14G06N3/08
Inventor 朱合华李晓军胡传鹏
Owner TONGJI UNIV
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