Method and system for detecting appearance crack of structure

A detection method and technology for structures, which are applied in the field of detection methods and systems for the appearance of cracks in structures, can solve the problems of inability to accurately identify crack targets, complex identification algorithms, slow processing speed, etc., and reduce uneven illumination and image background noise. The effect of point influence, high detection accuracy, and small crack detection error

Inactive Publication Date: 2015-06-10
CHANGAN UNIV
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  • Application Information

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Problems solved by technology

When the background grayscale of the collected appearance image of the structure is inconsistent and there is a lot of noise, these algorithms cannot accurately identify the crack ta

Method used

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  • Method and system for detecting appearance crack of structure
  • Method and system for detecting appearance crack of structure
  • Method and system for detecting appearance crack of structure

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Experimental program
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Embodiment

[0058] First of all, it should be noted that the original object processed by the structure appearance crack detection method of the present invention is the structure appearance image, such as figure 1 As shown, in this embodiment, the acquisition device for the appearance image of the structure is composed of a digital SLR camera, a telephoto lens, a telemeter, a camera flash, an infrared distance sensor and an angle sensor. Aiming at the detection accuracy requirements of long-distance non-contact structure appearance cracks, Nikon D300 is selected as a digital SLR camera with a resolution of 4288×2048 pixels. According to the imaging principle, the focal length of the lens is required to reach 1000mm or more to detect 0.1mm cracks at a distance of 20m, and the cost factor is also considered; a 500mm telephoto lens is used with a teleconverter to make the imaging focal length reach 1000mm. When shooting images, the computer can be used to control the camera shutter to avoid...

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Abstract

The invention discloses a method and a system for detecting an appearance crack of a structure. The method comprises the steps of reading a pavement image; intercepting a rectangular interested area from the pavement image; performing the Contourlet transformation algorithm on the rectangular interested area to obtain an enhanced image; extracting edges of a target crack in the enhanced image; performing processing on an area adjacent to the edge pixel points by using a Canny edge detection operator; using the edge pixel points to replace the GAC model edge pixel points to obtain a binary image; acquiring the final target crack; calculating the difference between transverse and longitudinal coordinates of two end points of the final target crack to obtain an included angle between the final target crack and the horizontal direction; rotating the crack to be in the horizontal direction; calculating the maximum value and the minimum value and average value of the width of the crack; calculating the actual physical width of the target crack. With the adoption of the method, the system operation time can be effectively reduced; the crack edge in the cut image can be kept completely consistent with the crack edge of the original image, and thus the crack detection error is extremely small.

Description

technical field [0001] The invention belongs to the technical field of structure appearance crack detection, and in particular relates to a detection method and system for structure appearance cracks. Background technique [0002] It is an important means to effectively reduce its disease state and its impact to regularly detect whether the cracks on the appearance of the structure are generated and expanded. When cracks appear in structures such as buildings, roads, bridges, tunnels, and steel structures, they must be repaired in time, otherwise it will cause damage or corrosion inside the structure and seriously endanger the safety of the structure. The traditional crack detection method is contact detection, which requires inspectors to use scaffolding or ladders to observe closely on the surface of structures. Generally, inspectors use reading microscopes to manually read and record, which is extremely dangerous and labor-intensive. serious lack of objectivity. However...

Claims

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Application Information

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IPC IPC(8): G06T7/00
Inventor 李刚贺拴海巨永锋
Owner CHANGAN UNIV
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