Deflection measurement system and method based on stereoscopic vision

Abstract

The invention discloses a deflection measurement system based on stereoscopic vision. The deflection measurement system comprises an image collection module, a distance measurement and angle measurement module, a control module and a data processing module, wherein the control module controls the image collection module and the distance measurement and angle measurement module to perform data collection respectively, the image collection module and the distance measurement and angle measurement module respectively transmit the collected data to the data processing module in real time, the data processing module reconstructs the three-dimensional geometric information of a measured target by using the parallax error principle, and obtains a deflection value of each measured point by calculating a space coordinate change of each measured point on adjacent spaced image frames. The invention further discloses a deflection measurement method based on stereoscopic vision. The deflection measurement system disclosed by the invention adopts a dual measurement station mode, the two measurement stations are independent and have the same structural configuration, and can be used for both close-range measurement and long-distance large-field-of-view measurement, meanwhile, the effects of uneven illumination and haze are eliminated by using an image enhancement algorithm, so that the deflection measurement accuracy is improved, and the actual needs of engineering inspection are better satisfied.

Description

technical field [0001] The invention relates to the technical field of detection and monitoring of large facility engineering structures such as bridges, in particular to a deflection measurement system and method based on stereo vision. Background technique [0002] With the development of national infrastructure construction, different types of bridges, tunnels and other large-scale facilities are constantly emerging. As an important indicator for evaluating the safety and service life of large-scale facility structures, deflection measurement has become an important part of the health and safety assessment of large-scale facility structures. Work. [0003] Traditional deflection measurement often uses contact displacement sensors, dial indicators, etc. This method is low in cost and simple in structure, but it is time-consuming and laborious, cannot be installed under conditions such as crossing rivers and canyons, and cannot be measured in real time. Optical surveying a...

AI Technical Summary

Problems solved by technology

[0003] Traditional deflection measurement often uses contact displacement sensors, dial indicators, etc. This method is low in cost and simple in structure, but it is time-consuming and laborious, and cannot be installed under conditions such as crossing rivers and canyons, and cannot be measured in real time.

Optical surveying and mapping instruments such as total stations and theodolites can provide high measurement accuracy, but their detection range is limited, and they can only achieve point-by-point measurement, and cannot achieve large-scale detection of the entire field, resulting in low work efficiency

In recent years, the image measurement method has become a hot spot in the research of large-scale facility deflection non-contact measurement technology, but most of them use monocular vision image measurement method, which needs to use the object of known size in the scene as a reference object to realize the size measurement of the target object , it is not applicable to occasions where the reference object cannot be placed, and there are certain limitations in practical applications; in addition, only using a single camera will compress the pictures collected in the three-dimensional space to a two-dimensional plane, when the target surface of the camera is not parallel to the measured surface , its measurement accuracy will also be greatly affected by

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