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Human Mobility Monitoring in Very Low Resolution Visual Sensor Network

Image Processing and Interpretation, Gent University/iMinds, Gent 9000, Belgium
Digital Communications, Gent University/iMinds, Gent 9000, Belgium
Ambient Intelligence Research Lab, David Packard Building, Stanford, CA 94305, USA
Author to whom correspondence should be addressed.
Sensors 2014, 14(11), 20800-20824;
Received: 19 March 2014 / Revised: 3 October 2014 / Accepted: 16 October 2014 / Published: 4 November 2014
PDF [1140 KB, uploaded 4 November 2014]


This paper proposes an automated system for monitoring mobility patterns using a network of very low resolution visual sensors (30 × 30 pixels). The use of very low resolution sensors reduces privacy concern, cost, computation requirement and power consumption. The core of our proposed system is a robust people tracker that uses low resolution videos provided by the visual sensor network. The distributed processing architecture of our tracking system allows all image processing tasks to be done on the digital signal controller in each visual sensor. In this paper, we experimentally show that reliable tracking of people is possible using very low resolution imagery. We also compare the performance of our tracker against a state-of-the-art tracking method and show that our method outperforms. Moreover, the mobility statistics of tracks such as total distance traveled and average speed derived from trajectories are compared with those derived from ground truth given by Ultra-Wide Band sensors. The results of this comparison show that the trajectories from our system are accurate enough to obtain useful mobility statistics. View Full-Text
Keywords: visual sensor network; low resolution imagery; distributed processing; tracking;mobility analysis visual sensor network; low resolution imagery; distributed processing; tracking;mobility analysis

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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

Bo, N.B.; Deboeverie, F.; Eldib, M.; Guan, J.; Xie, X.; Niño, J.; Van Haerenborgh, D.; Slembrouck, M.; Van de Velde, S.; Steendam, H.; Veelaert, P.; Kleihorst, R.; Aghajan, H.; Philips, W. Human Mobility Monitoring in Very Low Resolution Visual Sensor Network. Sensors 2014, 14, 20800-20824.

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