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Sensors 2017, 17(6), 1305; doi:10.3390/s17061305

A High-Speed Target-Free Vision-Based Sensor for Bus Rapid Transit Viaduct Vibration Measurements Using CMT and ORB Algorithms

1
School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu 610500, China
2
School of Transportation and Logistics, Southwest Jiaotong University, Chengdu 610031, China
3
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
4
School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 26 March 2017 / Revised: 19 May 2017 / Accepted: 27 May 2017 / Published: 6 June 2017
(This article belongs to the Section Physical Sensors)

Abstract

Bus Rapid Transit (BRT) has become an increasing source of concern for public transportation of modern cities. Traditional contact sensing techniques during the process of health monitoring of BRT viaducts cannot overcome the deficiency that the normal free-flow of traffic would be blocked. Advances in computer vision technology provide a new line of thought for solving this problem. In this study, a high-speed target-free vision-based sensor is proposed to measure the vibration of structures without interrupting traffic. An improved keypoints matching algorithm based on consensus-based matching and tracking (CMT) object tracking algorithm is adopted and further developed together with oriented brief (ORB) keypoints detection algorithm for practicable and effective tracking of objects. Moreover, by synthesizing the existing scaling factor calculation methods, more rational approaches to reducing errors are implemented. The performance of the vision-based sensor is evaluated through a series of laboratory tests. Experimental tests with different target types, frequencies, amplitudes and motion patterns are conducted. The performance of the method is satisfactory, which indicates that the vision sensor can extract accurate structure vibration signals by tracking either artificial or natural targets. Field tests further demonstrate that the vision sensor is both practicable and reliable. View Full-Text
Keywords: vision-based sensor; vibration measurement; structural health monitoring; keypoint matching; CMT; BRT viaducts vision-based sensor; vibration measurement; structural health monitoring; keypoint matching; CMT; BRT viaducts
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hu, Q.; He, S.; Wang, S.; Liu, Y.; Zhang, Z.; He, L.; Wang, F.; Cai, Q.; Shi, R.; Yang, Y. A High-Speed Target-Free Vision-Based Sensor for Bus Rapid Transit Viaduct Vibration Measurements Using CMT and ORB Algorithms. Sensors 2017, 17, 1305.

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