User-independent motion state recognition using smartphone sensors

Gu, F, Kealy, A, Khoshelham, K and Shang, J 2015, 'User-independent motion state recognition using smartphone sensors', Sensors (Switzerland), vol. 15, no. 12, pp. 30636-30652.

Document type: Journal Article
Collection: Journal Articles

Title User-independent motion state recognition using smartphone sensors
Author(s) Gu, F
Kealy, A
Khoshelham, K
Shang, J
Year 2015
Journal name Sensors (Switzerland)
Volume number 15
Issue number 12
Start page 30636
End page 30652
Total pages 17
Publisher Copernicus GmbH
Abstract The recognition of locomotion activities (e.g., walking, running, still) is important for a wide range of applications like indoor positioning, navigation, location-based services, and health monitoring. Recently, there has been a growing interest in activity recognition using accelerometer data. However, when utilizing only acceleration-based features, it is difficult to differentiate varying vertical motion states from horizontal motion states especially when conducting user-independent classification. In this paper, we also make use of the newly emerging barometer built in modern smartphones, and propose a novel feature called pressure derivative from the barometer readings for user motion state recognition, which is proven to be effective for distinguishing vertical motion states and does not depend on specific users' data. Seven types of motion states are defined and six commonly-used classifiers are compared. In addition, we utilize the motion state history and the characteristics of people's motion to improve the classification accuracies of those classifiers. Experimental results show that by using the historical information and human's motion characteristics, we can achieve user-independent motion state classification with an accuracy of up to 90.7%. In addition, we analyze the influence of the window size and smartphone pose on the accuracy.
Subject Navigation and Position Fixing
Keyword(s) Activity recognition
Feature selection
Indoor location-based services
Indoor positioning
Motion state
Pressure derivative
DOI - identifier 10.3390/s151229821
Copyright notice © 2015 by the authors; licensee MDPI, Basel, Switzerland. Creative Commons by Attribution (CC-BY) license
ISSN 1424-8220
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