Device and method for shooting tunnel wall crack based on dome camera

Abstract

The invention relates to a device and method for shooting tunnel wall cracks based on a dome camera. The device comprises a dome camera and a plane mirror device, wherein the rotation angle of a mirror surface and the camera is obtained through mathematical calculation, a plane mirror is installed near a crack area, after the angle of the plane mirror is adjusted and the sight line of the dome camera is perpendicular to a crack virtual image plane, crack imaging in the mirror surface is shot, the focal length of the camera is adjusted in the shooting process, crack information on the tunnel wall surface is covered as much as possible, and crack pictures are obtained. According to the invention, by using the dome camera shooting method of the plane mirror device, the interference of a large number of irrelevant backgrounds on tunnel wall crack imaging can be avoided, and the definition of tunnel wall crack pictures is greatly improved; and on the premise that it is guaranteed that the picture obtained in each time of shooting is in a front view, the complexity of related work of later tunnel wall crack analysis can be greatly reduced, and the accuracy of tunnel wall crack data analysis is improved.

Description

technical field [0001] The invention relates to a device and method for photographing cracks on a tunnel wall based on a spherical camera, which belongs to the field of health monitoring of civil engineering structures, in particular to the technical field of crack monitoring. Background technique [0002] Cracks are the most common defects in civil engineering with complex causes. The appearance of cracks will have an impact on the safety and use of the building itself. With the invasion of external harmful components, the cracks will continue to expand and deteriorate, which is very likely to cause engineering accident. At present, due to the long service life of existing tunnels in China, accidents caused by aging deformation of various parts, crack leakage and other problems are common, so its monitoring is extremely necessary. [0003] At present, most of the cracks in the tunnel are analyzed and monitored by computer vision, that is, signs are installed next to the cr...

AI Technical Summary

Problems solved by technology

In actual engineering, when the spherical camera shoots with cracks as the main background, most of the photos obtained will be blurred, resulting in low precision of the photos, which is not conducive to the development of follow-up analysis work; at the same time, due to the cracks The position plane is not perpendicular to the camera's line of sight, and the obtained photos will show an oblique angle, resulting in a large error in the data of the cracks obtained in the later image analysis

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