Wearable computing: accelerometers' data classification of body postures and movements

Authors:
Wallace Ugulino;Débora Cardador;Katia Vega;Eduardo Velloso;Ruy Milidiú;Hugo Fuks
Affiliations:
Informatics Department, Pontifical Catholic University of Rio de Janeiro, Brazil;Informatics Department, Pontifical Catholic University of Rio de Janeiro, Brazil;Informatics Department, Pontifical Catholic University of Rio de Janeiro, Brazil;School of Computing and Communications, Lancaster University, UK;Informatics Department, Pontifical Catholic University of Rio de Janeiro, Brazil;Informatics Department, Pontifical Catholic University of Rio de Janeiro, Brazil
Venue:
SBIA'12 Proceedings of the 21st Brazilian conference on Advances in Artificial Intelligence
Year:
2012

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Abstract

During the last 5 years, research on Human Activity Recognition (HAR) has reported on systems showing good overall recognition performance. As a consequence, HAR has been considered as a potential technology for e-health systems. Here, we propose a machine learning based HAR classifier. We also provide a full experimental description that contains the HAR wearable devices setup and a public domain dataset comprising 165,633 samples. We consider 5 activity classes, gathered from 4 subjects wearing accelerometers mounted on their waist, left thigh, right arm, and right ankle. As basic input features to our classifier we use 12 attributes derived from a time window of 150ms. Finally, the classifier uses a committee AdaBoost that combines ten Decision Trees. The observed classifier accuracy is 99.4%.