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Mathematical Problems in Engineering
Volume 2015, Article ID 790412, 8 pages
http://dx.doi.org/10.1155/2015/790412
Research Article

Daily Human Physical Activity Recognition Based on Kernel Discriminant Analysis and Extreme Learning Machine

School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received 10 September 2014; Accepted 26 November 2014

Academic Editor: Amaury Lendasse

Copyright © 2015 Wendong Xiao and Yingjie Lu. 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.

Abstract

Wearable sensor based human physical activity recognition has extensive applications in many fields such as physical training and health care. This paper will be focused on the development of highly efficient approach for daily human activity recognition by a triaxial accelerometer. In the proposed approach, a number of features, including the tilt angle, the signal magnitude area (SMA), and the wavelet energy, are extracted from the raw measurement signal via the time domain, the frequency domain, and the time-frequency domain analysis. A nonlinear kernel discriminant analysis (KDA) scheme is introduced to enhance the discrimination between different activities. Extreme learning machine (ELM) is proposed as a novel activity recognition algorithm. Experimental results show that the proposed KDA based ELM classifier can achieve superior recognition performance with higher accuracy and faster learning speed than the back-propagation (BP) and the support vector machine (SVM) algorithms.