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Area selection-based automatic crack size measurement method

A crack size, automatic measurement technology, applied in measurement devices, instruments, optical devices, etc., can solve the problems of harsh working environment, inaccurate measurement, and high labor costs, so as to reduce measurement difficulty, increase measurement efficiency, and improve The effect of the work environment

Inactive Publication Date: 2014-01-22
北京交通大学长三角研究院
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] At present, the known crack size measurement is to measure the cracks on-site by technicians using physical tools such as rulers. This measurement method will increase the difficulty of measurement due to the irregularity of the cracks, and it will take a lot of manpower and the working environment is relatively harsh.
And the measurement will be inaccurate due to the limitation of the tool, so that the growth trend of the crack cannot be judged
Some ultrasonic crack measurement tools on the market are aimed at the measurement of crack depth, and cannot judge the length and width

Method used

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Embodiment Construction

[0030] Embodiments of the inventive method comprise the following steps:

[0031] 1) Collect the crack image, and convert the three-channel color image into a single-channel grayscale image for the collected crack image, such as figure 1 shown;

[0032] 2) Take a screenshot of the grayscale image, and the intercepted area is the interior of the N-point polygon, such as figure 2 shown;

[0033] 3) Divide the image into foreground and background parts by manually setting the threshold; it is convenient for users to visually observe the extraction status of cracks, such as image 3 - Figure 5 shown;

[0034] 4) After extracting the complete binarized crack image, use the check image whose length and width are 2 and whose reference point is (0,0) to traverse; once the traversal is completed, the image is corroded in a single step (such as Figure 6 , Figure 7 ), when the sum of the gray values ​​of each pixel in the image no longer changes, the corrosion is complete, and ...

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Abstract

The invention relates to a construction inspection technique, in particular to an area selection-based automatic crack size measurement method which is used for detecting the sizes of cracks on various facilities including buildings and bridges. The method includes the following steps: (1) a crack image is acquired and converted into a single-channel grey image; (2) the grey image is dotted and captured; (3) the image is divided into a foreground part and a background part; (4) a checking image, the length and width of which are 2 and the reference point of which is (0, 0), is applied for traversing; the image is eroded in a single step once each time when traversing is finished, and eroding frequency S1 is counted; (5) the binarized crack image is reversed, so that the crack is detailed, and the image is then reversed; (6) the detailing of the crack is improved; and a crack pixel number S2 is counted; (7) a single-step erosion width and a single-pixel width is determined: a equal to W1 divided by S1; and b equal to L1 divided by S2; (8) the maximum width and length of the crack is worked out: W equal to S1 multiplied by a, and L equal to S2 multiplied by b.

Description

technical field [0001] The invention relates to engineering detection technology, in particular to an automatic crack size measurement method based on area selection for detecting crack sizes on various buildings, bridges and other facilities. Background technique [0002] At present, the known crack size measurement is to measure the cracks on-site by technicians using physical tools such as rulers. This measurement method will increase the difficulty of measurement due to the irregularity of the cracks, and requires a lot of manpower and the working environment is relatively harsh. And the measurement will be inaccurate due to the limitation of the tool, so the growth trend of the crack cannot be judged. Some ultrasonic crack measurement tools on the market are aimed at the measurement of crack depth, and cannot judge the length and width. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the defects of traditi...

Claims

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Application Information

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IPC IPC(8): G01B11/02
Inventor 张杰齐超张宁刘峰
Owner 北京交通大学长三角研究院
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