High-rise structure dynamic displacement measurement method based on unmanned aerial vehicle aerial photography

Abstract

The invention provides a high-rise structure dynamic displacement measurement method based on unmanned aerial vehicle aerial photography. The method comprises the steps of acquiring a dynamic displacement video of the top end of a high-rise structure shot by an unmanned aerial vehicle; capturing a plurality of to-be-measured points of the first frame of dynamic displacement image at the top end of the high-rise structure as measurement points; using a pyramid algorithm to carry out displacement moving point capture on the multiple frames of dynamic displacement images to obtain a plurality of optical streams; calculating optical flow vectors of the plurality of optical flows by using an optical flow method to obtain an optical flow field; performing threshold segmentation on the optical flow field to divide the multiple frames of dynamic displacement images into backgrounds and moving targets; extracting a pixel coordinate of a moving target in each frame of dynamic displacement image, and calculating a displacement coordinate of a measurement point by taking the measurement point of the first frame of dynamic displacement image as a zero point coordinate to obtain dynamic displacement initial data of the top end of the high-rise structure; and correcting initial data of dynamic displacement of the top end of the high-rise structure by using suspension displacement compensation of the unmanned aerial vehicle. According to the invention, the problem of a large measurement result error caused by the fact that the camera is far away from the moving part of the measured high-rise structure can be solved.

Description

technical field [0001] The invention relates to the technical field of structural dynamic displacement measurement, in particular to a method for measuring the dynamic displacement of towering structures based on unmanned aerial vehicles. Background technique [0002] For structural dynamic displacement, the most common method of measuring it is to lay out displacement sensors, which requires a fixed point and a moving point. Specifically, for the fixed point, the displacement sensor can be fixed on the bracket before the measurement, and it can be kept in a static state during the measurement as the fixed point, and then the movable end of the displacement sensor can be connected to the test piece. For low-slung structures, the problem of sensor fixing points can be well solved by erecting brackets, but for towering structures over 10 meters, erecting brackets firstly has safety risks, and then the cost is particularly high, and most importantly, in many occasions The supp...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the existing technology, the present invention proposes a method for measuring the dynamic displacement of towering structures based on unmanned aerial photography to solve the problem in the prior art that the distance between the camera and the moving part of the towering structure to be measured is very far, which will cause damage to the towering structure. The technical problem of the large error in the measurement result of the dynamic displacement of the towering structure

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