Adapting magnetic resonant coupling based relative positioning technology for wearable activitiy recogniton

Authors:
Gerald Pirkl;Karl Stockinger;Kai Kunze;Paul Lukowicz
Affiliations:
Embedded Systems Lab, University of Passau, Germany;Embedded Systems Lab, University of Passau, Germany;Embedded Systems Lab, University of Passau, Germany;Embedded Systems Lab, University of Passau, Germany
Venue:
ISWC '08 Proceedings of the 2008 12th IEEE International Symposium on Wearable Computers
Year:
2008

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Abstract

We demonstrate how modulated magnetic field technology that is well established in high precision, stationary motion tracking systems can be adapted to wearable activity recognition. To this end we describe the design and implementation of a cheap (components cost about 20 Euro for the transmitter and 15 Euro for the receiver), low power (17mA for the transmitter and 40mA for the receiver), and easily wearable (the main size constraint are the coils which are about 25mm3) system for tracking the relative position and orientation of body parts. We evaluate our system on two recognition tasks. On a set of 6 subtle nutrition related gestures it achieves 99.25% recognition rate compared to 94.1% for a XSense inertial device ( operated calibrated, euler angle mode). On the recognition of 8 Tai Chi moves it reaches 94 % compared to 86% of an accelerometer. Combining our sensor with the accelerometer leads to 100% correct recognition (as compared to 90% when combining the accelerometer with a gyro).