Two-dimensional Displacement and Strain Monitoring Method of Structure Based on Digital Image Processing Technology

Abstract

The invention provides a method for monitoring the two-dimensional displacement and the strain of a structure based on the digital image processing technology. The method is characterized in that a circular pattern is adopted as a target, wherein the target is a shooting object used for being shot to acquire a digital image, the displacement or the strain of a corresponding point, to be monitored, of the structure can be determined by processing the digital image, the circular pattern guarantees the non-directional feature of the cross section of the target, namely, the target does not need to be strictly adjusted to be right during monitoring of physical quantities of the structure, in common words, the situation that due to inclination of the target, the circular pattern becomes rhombic from being square like a square pattern is avoided, and the circular pattern can be kept circular all the time; a square pattern with the known side length is adopted as a calibration plate, wherein the calibration plate is a shooting object for calibration of a current vision monitoring system; a circular circle center is selected as the feature of the image of the target to be extracted, wherein the feature is a monitoring calculation point selected for determining the corresponding displacement or strain of the structure from the shot digital image of the target.

Description

technical field [0001] The invention discloses a method for monitoring two-dimensional displacement and strain of a non-contact structure, in particular a method for monitoring two-dimensional displacement and strain of a non-contact structure based on digital image processing and an implementation process of the method. Background technique [0002] In order to ensure structural safety and people's life, property and safety, it is very necessary to conduct structural health monitoring. There are many contents of structural health monitoring, such as load monitoring, temperature monitoring, acceleration monitoring, displacement monitoring, strain monitoring and so on. Among them, structural displacement and strain monitoring is an important part of structural health monitoring. By monitoring the displacement and strain of the structure under construction, we can know whether the structure meets the design requirements, and make timely corrections when there is a large displ...

AI Technical Summary

Problems solved by technology

When LED lights are used as the target, the requirements for the shooting environment are relatively strict, and it is best to shoot in a completely dark environment. Therefore, the design of this target limits the scope of application of the method, so that it can only be used in nighttime displacement. Monitoring or deformation monitoring inside the subway tunnel

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