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Sensors 2009, 9(11), 8508-8546; doi:10.3390/s91108508
Article

Classifying Human Leg Motions with Uniaxial Piezoelectric Gyroscopes

,
 and
*
Department of Electrical and Electronics Engineering, Bilkent University, Bilkent 06800 Ankara, Turkey
* Author to whom correspondence should be addressed.
Received: 10 August 2009 / Revised: 21 September 2009 / Accepted: 28 September 2009 / Published: 27 October 2009
(This article belongs to the Special Issue Motion Detectors)
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Abstract

This paper provides a comparative study on the different techniques of classifying human leg motions that are performed using two low-cost uniaxial piezoelectric gyroscopes worn on the leg. A number of feature sets, extracted from the raw inertial sensor data in different ways, are used in the classification process. The classification techniques implemented and compared in this study are: Bayesian decision making (BDM), a rule-based algorithm (RBA) or decision tree, least-squares method (LSM), k-nearest neighbor algorithm (k-NN), dynamic time warping (DTW), support vector machines (SVM), and artificial neural networks (ANN). A performance comparison of these classification techniques is provided in terms of their correct differentiation rates, confusion matrices, computational cost, and training and storage requirements. Three different cross-validation techniques are employed to validate the classifiers. The results indicate that BDM, in general, results in the highest correct classification rate with relatively small computational cost.
Keywords: gyroscope; inertial sensors; motion classification; Bayesian decision making; rule-based algorithm; least-squares method; k-nearest neighbor; dynamic time warping; support vector machines; artificial neural networks gyroscope; inertial sensors; motion classification; Bayesian decision making; rule-based algorithm; least-squares method; k-nearest neighbor; dynamic time warping; support vector machines; artificial neural networks
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Tunçel, O.; Altun, K.; Barshan, B. Classifying Human Leg Motions with Uniaxial Piezoelectric Gyroscopes. Sensors 2009, 9, 8508-8546.

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