Preprocessing techniques for context recognition from accelerometer data

Authors:
Davide Figo;Pedro C. Diniz;Diogo R. Ferreira;João M. Cardoso
Affiliations:
IST, Technical University of Lisbon, Porto Salvo, Portugal 2744-016;IST, Technical University of Lisbon, Porto Salvo, Portugal 2744-016;IST, Technical University of Lisbon, Porto Salvo, Portugal 2744-016;Faculty of Engineering, University of Porto (FEUP), Porto, Portugal 4200-465
Venue:
Personal and Ubiquitous Computing
Year:
2010

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Abstract

The ubiquity of communication devices such as smartphones has led to the emergence of context-aware services that are able to respond to specific user activities or contexts. These services allow communication providers to develop new, added-value services for a wide range of applications such as social networking, elderly care and near-emergency early warning systems. At the core of these services is the ability to detect specific physical settings or the context a user is in, using either internal or external sensors. For example, using built-in accelerometers, it is possible to determine whether a user is walking or running at a specific time of day. By correlating this knowledge with GPS data, it is possible to provide specific information services to users with similar daily routines. This article presents a survey of the techniques for extracting this activity information from raw accelerometer data. The techniques that can be implemented in mobile devices range from classical signal processing techniques such as FFT to contemporary string-based methods. We present experimental results to compare and evaluate the accuracy of the various techniques using real data sets collected from daily activities.