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Flexible Piezoelectric Sensor-Based Gait Recognition
Open AccessArticle

Self-Tuning Threshold Method for Real-Time Gait Phase Detection Based on Ground Contact Forces Using FSRs

by Jing Tang 1,2, Jianbin Zheng 1,2, Yang Wang 1,2,*, Lie Yu 3, Enqi Zhan 1,2 and Qiuzhi Song 4
1
School of Information Engineering, Wuhan University of Technology, Wuhan 430070, China
2
Key Laboratory of Fiber Optic Sensing Technology and Information Processing, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China
3
School of Electronic and Electrical Engineering, Wuhan Textile University, Hongshan District, Wuhan 430070, China
4
School of Electromechanical, Beijing Institute of Technology, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(2), 481; https://doi.org/10.3390/s18020481
Received: 8 December 2017 / Revised: 20 January 2018 / Accepted: 31 January 2018 / Published: 6 February 2018
(This article belongs to the Special Issue Sensors for Gait, Posture, and Health Monitoring)
This paper presents a novel methodology for detecting the gait phase of human walking on level ground. The previous threshold method (TM) sets a threshold to divide the ground contact forces (GCFs) into on-ground and off-ground states. However, the previous methods for gait phase detection demonstrate no adaptability to different people and different walking speeds. Therefore, this paper presents a self-tuning triple threshold algorithm (STTTA) that calculates adjustable thresholds to adapt to human walking. Two force sensitive resistors (FSRs) were placed on the ball and heel to measure GCFs. Three thresholds (i.e., high-threshold, middle-threshold andlow-threshold) were used to search out the maximum and minimum GCFs for the self-adjustments of thresholds. The high-threshold was the main threshold used to divide the GCFs into on-ground and off-ground statuses. Then, the gait phases were obtained through the gait phase detection algorithm (GPDA), which provides the rules that determine calculations for STTTA. Finally, the STTTA reliability is determined by comparing the results between STTTA and Mariani method referenced as the timing analysis module (TAM) and Lopez–Meyer methods. Experimental results show that the proposed method can be used to detect gait phases in real time and obtain high reliability when compared with the previous methods in the literature. In addition, the proposed method exhibits strong adaptability to different wearers walking at different walking speeds. View Full-Text
Keywords: adaptability; force sensitive resistors; self-tuning triple threshold algorithm adaptability; force sensitive resistors; self-tuning triple threshold algorithm
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Tang, J.; Zheng, J.; Wang, Y.; Yu, L.; Zhan, E.; Song, Q. Self-Tuning Threshold Method for Real-Time Gait Phase Detection Based on Ground Contact Forces Using FSRs. Sensors 2018, 18, 481.

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