Journal
PERVASIVE AND MOBILE COMPUTING
Volume 10, Issue -, Pages 138-154Publisher
ELSEVIER
DOI: 10.1016/j.pmcj.2012.07.003
Keywords
Streaming; Online; Real-time; Activity recognition; Mutual information
Funding
- National Science Foundation (NSF) [CNS-0852172]
- National Institutes of Health (NIBIB) [R01EB009675]
- Life Sciences Discovery Fund
- Direct For Computer & Info Scie & Enginr
- Div Of Information & Intelligent Systems [1064628] Funding Source: National Science Foundation
- Division Of Computer and Network Systems
- Direct For Computer & Info Scie & Enginr [1262814] Funding Source: National Science Foundation
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Many real-world applications that focus on addressing needs of a human, require information about the activities being performed by the human in real-time. While advances in pervasive computing have led to the development of wireless and non-intrusive sensors that can capture the necessary activity information, current activity recognition approaches have so far experimented on either a scripted or pre-segmented sequence of sensor events related to activities. In this paper we propose and evaluate a sliding window based approach to perform activity recognition in an on line or streaming fashion; recognizing activities as and when new sensor events are recorded. To account for the fact that different activities can be best characterized by different window lengths of sensor events, we incorporate the time decay and mutual information based weighting of sensor events within a window. Additional contextual information in the form of the previous activity and the activity of the previous window is also appended to the feature describing a sensor window. The experiments conducted to evaluate these techniques on real-world smart home datasets suggests that combining mutual information based weighting of sensor events and adding past contextual information to the feature leads to best performance for streaming activity recognition. (C) 2012 Elsevier B.V. All rights reserved.
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