Structural crack automatic plotting and width precise measuring method and equipment

A crack width and detection method technology, which is applied in measurement devices, image data processing, instruments, etc., can solve problems such as inability to effectively distinguish cracks and noise interference, large error in calculating width of fine cracks, and large error in measuring crack width.

Active Publication Date: 2018-08-03
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

The previous "number of pixels" type crack width measurement method is often applicable to wider cracks in the image and can achieve better results, but for fine cracks (less than 5 pixels) in the image, the recognition error is large, It is difficult to meet the measurement accuracy requirements
[0006] In general, the condition of cracks is an important detection index for regular structural inspections, laboratory experiments and other projects. The method of manually drawing cracks is time-consuming and laborious, and the error in measuring crack width is relatively large
However, there are still major defects in crack detection based on image processing, specifically: (1) The traditional automatic crack delineation technology based on image processing often requires too much human intervention, and the degree of automation is low and cannot effectively distinguish cracks from noise. interference, the existing image crack recognition technology based on deep learning has achieved certain results, but it still cannot meet the requirements of accurate crack automatic delineation; Sacrifice the size of the field of view to meet the measurement accuracy requirements

Method used

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  • Structural crack automatic plotting and width precise measuring method and equipment
  • Structural crack automatic plotting and width precise measuring method and equipment
  • Structural crack automatic plotting and width precise measuring method and equipment

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Embodiment 1

[0070] Embodiment 1: A kind of structural crack automatic drawing method, such as image 3 As shown, the description method includes the following steps, 1) a crack detection method based on multi-scale deep learning, using multi-scale deep learning to detect the range of cracks in the image to ensure that follow-up work does not miss crack information; 2) based on The "overall-local collaborative segmentation" preliminary crack extraction method based on deep learning, median filtering and Hessian matrix linear enhancement ensures that the extracted results include both wide cracks and fine cracks in the image, ensuring a high recall rate of detection results ; 3) The fine crack detection method based on deep learning, image segmentation, and image reconstruction can effectively eliminate noise interference in the results and ensure high accuracy and high precision of the detection results. The step 1) multi-scale depth Learn how to detect cracks, specifically as follows: the...

Embodiment 2

[0096] Embodiment 2: A kind of accurate measurement method of crack width based on single-pixel crack skeleton and Zernike orthogonal moment, the traditional method of calculating crack width is to calculate the method of "counting pixels" of the distance between two pixel points, for 5 The calculation effect of cracks with a width below one pixel is poor. The present invention proposes a crack width calculation method based on a single-pixel skeleton and Zernike orthogonal moments for cracks less than 5 pixels in an image, such as Image 6 shown.

[0097] The crack width calculation method based on the single-pixel skeleton and Zernike orthogonal moments is characterized in that: the single-pixel skeleton is used to determine the rotation angle of the image, and the image at this point is rotated, symmetrical, and mirrored into two symmetrical images about the y-coordinate axis , use the orthogonal moment template to calculate the second-order orthogonal moments A of the two ...

Embodiment 3

[0102] Embodiment 3: A kind of laboratory concrete specimen crack automatic drawing and width measuring equipment, such as figure 1 As shown, it includes an image calibration module 1, an image acquisition module 2, an image processing system 3, and a camera bracket 4, wherein the image processing system 3 is embedded with an automatic crack delineation algorithm module, a crack feature analysis algorithm module, a calculation result storage module and a wireless transmission module;

[0103] Automatic drawing of structural cracks and precise width measurement equipment can realize rapid and automatic drawing of cracks on the surface of structures and accurately measure the width of cracks.

[0104] The image calibration module 1 is used to correct the camera posture and calculate the resolution of the image, and paste several checkerboards of known size manually printed on the surface of the concrete specimen; the image acquisition module 2 is composed of a single-lens refle...

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Abstract

The invention discloses a structural crack automatic plotting and width precise measuring method and structural crack automatic plotting and width precise measuring equipment. The structural crack automatic plotting and width precise measuring method comprises a crack automatic plotting method and a crack width calculation method based on a single pixel framework and a Zernike orthogonal moment, the crack automatic plotting method is used for sketching cracks in a structure surface quickly and precisely, and the crack width calculation method based on the single pixel framework and the Zernikeorthogonal moment is used for calculating crack widths of wide cracks and fine cracks in an image in real time. The structural crack automatic plotting and width precise measuring method equipment integrates a testing function and an analysis function, mainly comprises an image calibration module, an image acquisition module and an image processing module, and can realize automatic detection of cracks of the structure surface, including: (1) high-precision and automatic sketching of cracks in the structure surface; (2) precise measurement of crack widths of the structure surface. The structural crack automatic plotting and width precise measuring method and the structural crack automatic plotting and width precise measuring equipment can be widely applied to periodic detection of structural appearance cracks and structural laboratory crack observation.

Description

technical field [0001] The invention relates to the field of structure detection and evaluation, in particular to a detection method and equipment for structure surface cracks based on digital image processing. Background technique [0002] In the field of civil engineering structures, the bearing capacity test of new materials and new structures is the most widely used experimental method. In the test of structural bearing capacity, in addition to measuring structural response indicators such as structural strain and deformation, the development of structural cracks is an important part of the measurement, and there is a clear correspondence between it and the bearing capacity of the structure. It is mainly done manually, and it is necessary to manually describe the cracks when the experiment is interrupted, and artificially use a crack width gauge to stick to the surface of the structure to read the crack width. In addition, no matter it is regular structural inspection, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/12G06T7/13G06T7/136G06T7/60
CPCG06T7/0002G06T7/12G06T7/13G06T7/136G06T7/60G06T2207/20032G01N33/383G06T7/155G06T7/181G06T7/0004G06T2207/10004G06T2207/20016G06T2207/20021G06T2207/20044G06T2207/20081G06T2207/20084G06T2207/20192G06T2207/30132G06T2207/30204G01B11/022G06T7/80G06T7/62G06T7/70G06T5/002G06T5/20G06T11/00G06T2207/30244
Inventor 张建倪富陶
Owner SOUTHEAST UNIV
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