Gesellschaft fr Informatik e.V.

Lecture Notes in Informatics

INFORMATIK 2009 - Im Focus das Leben P-154, 2181-2194 (2008).

Gesellschaft für Informatik, Bonn


Stefan Fischer, Erik Maehle, Rüdiger Reischuk (eds.)

Copyright © Gesellschaft für Informatik, Bonn


Activity recognition using optical sensors on mobile phones

Michael Wittke , Uwe Jänen , Aret Duraslan , Emre Cakar , Monika Steinberg and Jürgen Brehm


Each mobile phone with a built-in CMOS sensor can inherently be seen as sophisticated optical sensor being able to analyze its environment in terms of visual events and its own mobility. Due to mass production their price decreases steadily, although their processing capacity increases. Mobile phones are usually attached to people, who are driven by mobility. We define activities arising from this mobility as internal activities in contrast to external activities, that are caused by visual events. Both activities can be recognized by measuring the sensor's optical flow. We present a method to identify internal activities based on optical flow measurements and probabilistic reasoning. We implement a lifelogging application, running on a Linux-based mobile phone, that can detect internal activities such as moving left-hand, right-hand or walking with a recognition rate of 80\%. While standing still external activities are recognized using object detection.

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Gesellschaft für Informatik, Bonn
ISBN 978-3-88579-241-3

Last changed 24.01.2012 22:10:21