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Sensors 2018, 18(2), 468;

Flexible Piezoelectric Sensor-Based Gait Recognition

Center for Robotics Research, Korea Institute of Science and Technology, Seoul 02792, Korea
School of Electrical Engineering, Korea University, Seoul 02841, Korea
Author to whom correspondence should be addressed.
Received: 2 January 2018 / Revised: 1 February 2018 / Accepted: 3 February 2018 / Published: 5 February 2018
(This article belongs to the Special Issue Sensors for Gait, Posture, and Health Monitoring)
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Most motion recognition research has required tight-fitting suits for precise sensing. However, tight-suit systems have difficulty adapting to real applications, because people normally wear loose clothes. In this paper, we propose a gait recognition system with flexible piezoelectric sensors in loose clothing. The gait recognition system does not directly sense lower-body angles. It does, however, detect the transition between standing and walking. Specifically, we use the signals from the flexible sensors attached to the knee and hip parts on loose pants. We detect the periodic motion component using the discrete time Fourier series from the signal during walking. We adapt the gait detection method to a real-time patient motion and posture monitoring system. In the monitoring system, the gait recognition operates well. Finally, we test the gait recognition system with 10 subjects, for which the proposed system successfully detects walking with a success rate over 93 %. View Full-Text
Keywords: flexible sensor; gait recognition; piezoelectric material; wearable flexible sensor; gait recognition; piezoelectric material; wearable

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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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Cha, Y.; Kim, H.; Kim, D. Flexible Piezoelectric Sensor-Based Gait Recognition. Sensors 2018, 18, 468.

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