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Method and device for measuring percolating water area of shield tunnel lining segment

A technology for shield tunneling and lining segment, which is applied in measurement devices, optical devices, instruments, etc., can solve problems such as the influence of imaging quality and the inapplicability of identification and measurement methods.

Inactive Publication Date: 2012-09-19
TONGJI UNIV
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  • Abstract
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  • 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 identification 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 to Improve the Accuracy of Leakage Water Disease Detection in Shield Tunnel Segments

Method used

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  • Method and device for measuring percolating water area of shield tunnel lining segment
  • Method and device for measuring percolating water area of shield tunnel lining segment
  • Method and device for measuring percolating water area of shield tunnel lining segment

Examples

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Embodiment 1

[0079] Such as figure 1 As shown, a method for measuring the leakage area of ​​the lining segment of a shield tunnel includes the following steps:

[0080] Step 101, using the computer vision toolkit HALCON calibration method to calibrate the camera to obtain the internal parameters of the camera;

[0081] Step 102, keep the internal parameters of the camera unchanged, use the device of the present invention to take images of water leakage damage on the front of the segment, and measure the shooting distance and shooting angle. In this implementation, the shooting distance is 4.246m, and the shooting angle is 27.8°;

[0082] Step 103, using the division distortion model to perform lens distortion correction on the collected leakage water damage images;

[0083] Step 104, converting the collected image into a grayscale image, and selecting a region of interest to be measured on the converted grayscale image;

[0084] Step 105, perform Blob analysis on the ROI: determine the ...

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Abstract

The invention relates to a method and device for measuring the percolating water area of a shield tunnel lining segment. The method comprises the specific steps of: calibrating a camera by adopting a computer vision tool kit; acquiring an image of segment percolating water, measuring a shooting distance and a shooting inclination by using a laser distance measuring instrument; carrying out lens distortion correction on the acquired percolating water disease image by adopting a division distortion model; converting the acquired image into a gray image; carrying out Blob analysis on an ROI (Region of Interest), i.e., determining a maximum threshold and a minimum threshold of the ROI, and carrying out threshold segmentation to obtain region characteristics in the image including the segment percolating water region; carrying out connecting Blob analysis on the image obtained through primary segmentation, and connecting all target pixels judged as percolating water regions into a block; filling and filtering the percolating water disease region by adopting an opening operation and a closing operation to obtain a final percolating water region; calculating the area of the percolating water region; correcting the area of the segment percolating water region; and figuring out the actual area of the segment percolating water region. The method and device have the advantages of low cost, high precision, rapidness and convenience, and the like.

Description

technical field [0001] The invention relates to a shield tunnel lining segment leakage water measurement technology, in particular to a method and device for measuring the shield tunnel lining segment leakage water area. 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 measurement method of segment leakage area estimated by human eyes has shortcomings such as high subjectivity, low accuracy and efficiency, and difficult storage and management of results. , will gradually be 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 convenience and flexibility, non-contact data acquisition, and easy image processin...

Claims

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Application Information

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IPC IPC(8): G01B11/28
Inventor 李晓军孙仕敏朱合华胡传鹏牛耘诗
Owner TONGJI UNIV
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