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Sensors 2018, 18(9), 2890; https://doi.org/10.3390/s18092890

Non-Contact Measurement of the Surface Displacement of a Slope Based on a Smart Binocular Vision System

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
*
Author to whom correspondence should be addressed.
Received: 14 July 2018 / Revised: 18 August 2018 / Accepted: 25 August 2018 / Published: 31 August 2018
(This article belongs to the Section Physical Sensors)
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Abstract

The paper presents an intelligent real-time slope surface deformation monitoring system based on binocular stereo-vision. To adapt the system to field slope monitoring, a design scheme of concentric marking point is proposed. Techniques including Zernike moment edge extraction, the least squares method, and k-means clustering are used to design a sub-pixel precision localization method for marker images. This study is mostly focused on the tracking accuracy of objects in multi-frame images obtained from a binocular camera. For this purpose, the Upsampled Cross Correlation (UCC) sub-pixel template matching technique is employed to improve the spatial-temporal contextual (STC) target-tracking algorithm. As a result, the tracking accuracy is improved to the sub-pixel level while keeping the STC tracking algorithm at high speed. The performance of the proposed vision monitoring system has been well verified through laboratory tests. View Full-Text
Keywords: slope monitoring; surface deformation; binocular vision; subpixel resolution; user defined target slope monitoring; surface deformation; binocular vision; subpixel resolution; user defined target
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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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He, L.; Tan, J.; Hu, Q.; He, S.; Cai, Q.; Fu, Y.; Tang, S. Non-Contact Measurement of the Surface Displacement of a Slope Based on a Smart Binocular Vision System. Sensors 2018, 18, 2890.

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