Visual measurement method for geometrical parameters of apparent crack

Abstract

The invention discloses an apparent crack geometric parameter visual measurement method, which comprises the following steps of: carrying out image acquisition and distance measurement, acquiring pixel precision, acquiring the pixel precision, acquiring the nearest distance between a pixel of a crack without a skeleton region and a skeleton; s5, acquiring the distance between the pixel of the crack edge removal area and the skeleton, marking the coverage part of the connection line of the two to obtain a corresponding marking array, acquiring the nearest distance between the pixel of the crack edge removal area and the skeleton, marking the coverage part of the connection line of the two to obtain a corresponding marking array, fusing the arrays marked in S4 and S5, performing color mapping, and exporting a measurement result. Measurement and calculation are carried out on the basis of a crack image of a related area acquired by image acquisition equipment, a crack width visualization result can be provided for people, and the average width, length and area of the crack can be measured and calculated; meanwhile, during image acquisition, a laser range finder is selected, the working distance of a camera is obtained, the image pixel precision is calculated in combination with the used focal length, and then the width of each position, the actual crack length value, the actual crack area and the actual average crack width value are calculated.

Description

technical field [0001] The invention relates to the field of repair and maintenance of buildings and roads, in particular to a visual measurement method for geometric parameters of apparent cracks. Background technique [0002] With the development of society, as people's living and production requirements for infrastructure continue to increase, the stock of various buildings and roads is also increasing. Routine inspection and maintenance is an important guarantee to ensure that these infrastructures are in service safely and on schedule. Among them, the measurement and statistics of apparent cracks are an important part of this kind of work. Such cracks are narrow in shape, widely distributed, and randomly located in disorder, consuming a lot of energy. So this year, researchers have tried to propose and use various new statistical methods for apparent cracks. Compared with the existing common methods, the calculation of apparent crack-related parameters based on digit...

AI Technical Summary

Problems solved by technology

However, the existing algorithm can only calculate the average width of cracks and cannot give visual width measurement results, and it is difficult for front-line staff to intuitively understand the specific values ​​of crack widths everywhere

In addition, most of the images obtained based on existing methods fail to obtain their pixel accuracy, that is, most of them can only understand the pixel distance value according to the measurement results, and it is difficult to obtain the actual value of geometric dimensions such as width and length

These have brought troubles to a detailed understanding of the development of cracks everywhere

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