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Proceedings Paper

High speed image techniques for construction safety net monitoring in outdoor conditions
Author(s): Belen Ferrer; Juan C. Pomares; Ramón Irles; Julian Espinosa; David Mas
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Paper Abstract

The behaviour of a construction safety net and its supporting structure was monitored with a high speed camera and image processing techniques. A 75 kg cylinder was used to simulate a falling human body from a higher location in a sloped surface of a building under construction. The cylinder rolled down over a ramp until it reaches the net. The behaviour of the net and its supporting structure was analysed through the movement of the cylinder once it reaches the net. The impact was captured from a lateral side with a high speed camera working at 512 frames per second. In order to obtain the cylinder position each frame of the sequence was binarized. Through morphological image processing the contour of the cylinder was isolated from the background and with a Hough transform the presence of the circle was detected. With this, forces and accelerations applying on the net and the supporting structure have been described, together with the trajectory of the cylinder. All the experiment has been done in a real structure in outdoors location. Difficulties found in the preparation on the experiment and in extracting the final cylinder contour are described and some recommendations are giving for future implementations.

Paper Details

Date Published: 1 May 2012
PDF: 8 pages
Proc. SPIE 8436, Optics, Photonics, and Digital Technologies for Multimedia Applications II, 84361B (1 May 2012); doi: 10.1117/12.922732
Show Author Affiliations
Belen Ferrer, Univ. of Alicante (Spain)
Juan C. Pomares, Univ. of Alicante (Spain)
Ramón Irles, Univ. of Alicante (Spain)
Julian Espinosa, Univ. of Alicante (Spain)
David Mas, Univ. of Alicante (Spain)

Published in SPIE Proceedings Vol. 8436:
Optics, Photonics, and Digital Technologies for Multimedia Applications II
Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editor(s)

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