title: Advancing from offline to online activity recognition with wearable sensors.
abstract: Activity recognition with wearable sensors could motivate people to perform a variety of different sports and other physical exercises. We have earlier developed algorithms for offline analysis of activity data collected with wearable sensors. In this paper, we present our current progress in advancing the platform for the existing algorithms to an online version, onto a PDA. Acceleration data are obtained from wireless motion bands which send the 3D raw acceleration signals via a Bluetooth link to the PDA which then performs the data collection, feature extraction and activity classification. As a proof-of-concept, the online activity system was tested with three subjects. All of them performed at least 5 minutes of each of the following activities: lying, sitting, standing, walking, running and cycling with an exercise bike. The average second-by-second classification accuracies for the subjects were 99%, 97%, and 82 %. These results suggest that earlier developed offline analysis methods for the acceleration data obtained from wearable sensors can be successfully implemented in an online activity recognition application.
authors.affiliation: VTT Technical Research Centre of Finland, P.O. Box 1300, FI-33101, Tampere, Finland. miikka.ermes@vtt.fi
authors.forename: Miikka
authors.initials: M
authors.lastname: Ermes
authors.forename: Juha
authors.initials: J
authors.lastname: Parkka
authors.forename: Luc
authors.initials: L
authors.lastname: Cluitmans
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D001698:Biomedical Engineering / Q000379:methods*; D003195:Computer Communication Networks; D004582:Electronics, Medical; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008838:Microcomputers; D015233:Models, Statistical; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods*; D009068:Movement; D012815:Signal Processing, Computer-Assisted; D016138:Walking