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Sensors 2017, 17(3), 430; doi:10.3390/s17030430

PTZ Camera-Based Displacement Sensor System with Perspective Distortion Correction Unit for Early Detection of Building Destruction

School of Electronics Engineering, Kyungpook National University, Daegu 41566, Korea
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Academic Editor: Jonathan Li
Received: 5 December 2016 / Revised: 12 February 2017 / Accepted: 20 February 2017 / Published: 23 February 2017
(This article belongs to the Section Remote Sensors)
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Abstract

This paper presents a pan-tilt-zoom (PTZ) camera-based displacement measurement system, specially based on the perspective distortion correction technique for the early detection of building destruction. The proposed PTZ-based vision system rotates the camera to monitor the specific targets from various distances and controls the zoom level of the lens for a constant field of view (FOV). The proposed approach adopts perspective distortion correction to expand the measurable range in monitoring the displacement of the target structure. The implemented system successfully obtains the displacement information in structures, which is not easily accessible on the remote site. We manually measured the displacement acquired from markers which is attached on a sample of structures covering a wide geographic region. Our approach using a PTZ-based camera reduces the perspective distortion, so that the improved system could overcome limitations of previous works related to displacement measurement. Evaluation results show that a PTZ-based displacement sensor system with the proposed distortion correction unit is possibly a cost effective and easy-to-install solution for commercialization. View Full-Text
Keywords: structural health monitoring; displacement measurement; non-contact measurement; vision-based system; PTZ camera; perspective transformation structural health monitoring; displacement measurement; non-contact measurement; vision-based system; PTZ camera; perspective transformation
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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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Jeong, Y.; Park, D.; Park, K.H. PTZ Camera-Based Displacement Sensor System with Perspective Distortion Correction Unit for Early Detection of Building Destruction. Sensors 2017, 17, 430.

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