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Sensors 2014, 14(2), 3293-3307; doi:10.3390/s140203293

Vertical Dynamic Deflection Measurement in Concrete Beams with the Microsoft Kinect

1,* , 2
Received: 11 December 2013 / Revised: 9 January 2014 / Accepted: 7 February 2014 / Published: 19 February 2014
(This article belongs to the Section Physical Sensors)
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The Microsoft Kinect is arguably the most popular RGB-D camera currently on the market, partially due to its low cost. It offers many advantages for the measurement of dynamic phenomena since it can directly measure three-dimensional coordinates of objects at video frame rate using a single sensor. This paper presents the results of an investigation into the development of a Microsoft Kinect-based system for measuring the deflection of reinforced concrete beams subjected to cyclic loads. New segmentation methods for object extraction from the Kinect’s depth imagery and vertical displacement reconstruction algorithms have been developed and implemented to reconstruct the time-dependent displacement of concrete beams tested in laboratory conditions. The results demonstrate that the amplitude and frequency of the vertical displacements can be reconstructed with submillimetre and milliHz-level precision and accuracy, respectively.
Keywords: Microsoft Kinect; quantization error; structural deflection measurement Microsoft Kinect; quantization error; structural deflection measurement
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.

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Qi, X.; Lichti, D.; El-Badry, M.; Chow, J.; Ang, K. Vertical Dynamic Deflection Measurement in Concrete Beams with the Microsoft Kinect. Sensors 2014, 14, 3293-3307.

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