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Dynamic detection method for crack of bridge bottom surface

A dynamic detection and bottom surface technology, applied in measuring devices, instruments, optical devices, etc., can solve the problems of large manpower and high risk factor, and achieve the effect of reducing labor force and improving safety.

Inactive Publication Date: 2014-01-22
北京交通大学长三角研究院
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing measurement methods that consume more manpower and have a higher risk factor, and provide a dynamic detection method for cracks on the bottom of the bridge, so that the method can not only detect whether there are cracks on the bottom of the bridge , and can conveniently mark and dynamically monitor cracks

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  • Dynamic detection method for crack of bridge bottom surface
  • Dynamic detection method for crack of bridge bottom surface
  • Dynamic detection method for crack of bridge bottom surface

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Embodiment Construction

[0017] The embodiment of bridge bottom surface crack dynamic detection method of the present invention comprises the following steps:

[0018] Step 1: Collect the video image of the bottom surface of the bridge, and convert the three-channel color image into a single-channel grayscale image for each frame of the video (such as figure 1 );

[0019] Step 2: Divide the grayscale image into foreground and background parts by dynamically setting the threshold, that is, binarize the grayscale image (such as figure 2 ), the dynamic segmentation of the image is realized by the traditional OTSU algorithm; this algorithm can calculate the threshold value for the gray distribution of each frame image, and this method can avoid the inaccuracy of crack extraction caused by setting a unified threshold value;

[0020] Step three, such as image 3 , after the cracks are divided through the above steps, the area of ​​the connected domain and the ratio of the major and minor axes of the circ...

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Abstract

The invention relates to the bridge detection technology, in particular to a dynamic detection method for a crack of a bridge bottom surface, which can be used for performing dynamic detection on the crack of the bridge bottom surface. The method comprises the following steps: S1, acquiring video images of the bridge bottom surface, and graying the color images; S2, performing binaryzation of gray level images; S3, screening a connected domain through area and the major-minor axis ratio of a minimum enclosing rectangle, and judging the connected domain meeting the following conditions a and b to be the crack; S4, drawing the minimum enclosing rectangle of a target area in an original drawing, so that the location of the crack can be visually observed, and the identification of the crack is realized. According to the dynamic detection method provided by the invention, the dynamic detection can be performed on the acquired video images, and therefore, the labor force is reduced, and the safety during a detection process is improved. Detection personnel can visually observe the location of the crack by marking the crack.

Description

technical field [0001] The invention relates to bridge detection technology, in particular to a dynamic detection method for bridge bottom cracks which can dynamically monitor bridge bottom cracks. Background technique [0002] At present, the known detection of cracks on the bottom surface of bridges is to observe the bottom surface of bridges by technicians and identify cracks by human eyes. This traditional detection method takes a lot of manpower, and is affected by the environment and the location of the bridge, which will bring danger to technicians. In addition, there are ultrasonic testing and shock elastic wave testing, etc. These testing methods are mainly used to detect the depth of cracks, and it is impossible to visually observe the location of cracks. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing measurement methods that consume more manpower and have a higher ri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
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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