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Open AccessArticle

On-Body Sensor Positions Hierarchical Classification

Department of Computer and Information Sciences, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan
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Sensors 2018, 18(11), 3612; https://doi.org/10.3390/s18113612
Received: 21 September 2018 / Revised: 21 October 2018 / Accepted: 22 October 2018 / Published: 24 October 2018
(This article belongs to the Section Physical Sensors)
Many motion sensor-based applications have been developed in recent years because they provide useful information about daily activities and current health status of users. However, most of these applications require knowledge of sensor positions. Therefore, this research focused on the problem of detecting sensor positions. We collected standing-still and walking sensor data at various body positions from ten subjects. The offset values were removed by subtracting the sensor data of standing-still phase from the walking data for each axis of each sensor unit. Our hierarchical classification technique is based on optimizing local classifiers. Many common features are computed, and informative features are selected for specific classifications. In this approach, local classifiers such as arm-side and hand-side discriminations yielded F1-scores of 0.99 and 1.00, correspondingly. Overall, the proposed method achieved an F1-score of 0.81 and 0.84 using accelerometers and gyroscopes, respectively. Furthermore, we also discuss contributive features and parameter tuning in this analysis. View Full-Text
Keywords: sensor position; inertial measurement unit; feature selection; fractal dimension; hierarchical classification sensor position; inertial measurement unit; feature selection; fractal dimension; hierarchical classification
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Sang, V.N.T.; Yano, S.; Kondo, T. On-Body Sensor Positions Hierarchical Classification. Sensors 2018, 18, 3612.

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