Multi-vision-based bridge three-dimensional deformation monitoring method

Abstract

The invention provides a multi-vision-based bridge three-dimensional deformation monitoring method which comprises the following steps of: (1) obtaining the images of calibration plates and extracting the feature points on the multiple calibration plates by multiple video cameras respectively; (2) establishing a mapping model based on a BP neural network; (3) obtaining each video camera image at the bridge edge feature points; (4) eliminating the error point pairs by use of RANSAC to obtain the correct matching point pairs; (5) extracting the two-dimensional coordinates of each video camera image at the bridge edge feature points, obtaining the three-dimensional world coordinates of the feature points according to the mapping model based on BP neutral network, and drawing a three-dimensional curve of the bridge surface; and (6) extracting the bridge deformation rule according to the bridge curves of the bridge at different moments, and judging the bridge deformation trend. The method provided by the invention can perform non-contact three-dimensional measurement on the bridge deformation, and has the advantages of continuous measurement, instant measurement, synchronous measurement of multiple points, high precision, repeatability, low cost and the like.

Description

[0001] technical field [0002] The invention belongs to the technical field of object measurement, in particular to a method for monitoring three-dimensional deformation of bridges based on multi-eye vision. [0003] Background technique [0004] With the rapid development of social economy and science and technology, bridge-building technology continues to improve, and bridge structures are gradually developing towards lightness and slenderness. At the same time, the load, span and deck width of the bridge are constantly increasing, and the structural type is constantly changing. The traditional deformation monitoring methods are increasingly unable to meet the requirements of deformation monitoring, which urgently needs more reliable equipment to monitor the deformation of bridges. [0005] At present, the existing bridge deformation monitoring technology can be divided into two categories: contact measurement and non-contact measurement. The summary is summarized in T...

AI Technical Summary

Problems solved by technology

This method has the advantages of high measurement accuracy and reliable data; but at the same time, there are some disadvantages when using the geodetic method: firstly, the monitoring speed is slow, and it is impossible to complete the observation of multiple deformation points in a short time; secondly, it is limited by the site conditions , unable to complete homework in some small spaces and insufficient light

The disadvantage is that the number of observation points is limited, because each observation point needs to be equipped with a receiver, the measurement cost is high, and indoor or underground operations cannot be realized.

[0016] To sum up, the existing deformation measurement technology generally has the following defects: (1) It is impossible to accurately record the information of the subject in an instant, and obtain the instant point-position relationship; (2) The precision equipment is expensive and the cost (3) Most high-precision measurement systems are contact measurement methods; (4) It is difficult to learn and train operators

(5) The measurement of irregular objects is difficult

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