Using liquid lenses to extend the operating range of a remote gaze tracking system

Authors:
T. Poitschke;E. Bay;F. Laquai;G. Rigoll;S. Bardins;K. Bartl;J. Vockeroth;E. Schneider
Affiliations:
Technische Univerität München, Institute for Human-Machine-Communication, Munich, Germany;Technische Univerität München, Institute for Human-Machine-Communication, Munich, Germany;Technische Univerität München, Institute for Human-Machine-Communication, Munich, Germany;Technische Univerität München, Institute for Human-Machine-Communication, Munich, Germany;Chair for Clinical Neurosciences, University of Munich Hospital, Munich, Germany;Chair for Clinical Neurosciences, University of Munich Hospital, Munich, Germany;Chair for Clinical Neurosciences, University of Munich Hospital, Munich, Germany;Chair for Clinical Neurosciences, University of Munich Hospital, Munich, Germany
Venue:
SMC'09 Proceedings of the 2009 IEEE international conference on Systems, Man and Cybernetics
Year:
2009

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Abstract

Remote eye tracking systems are widely used evaluation tools in many disciplines. Such systems have to deal with free head motions that cause a defocussing of the camera image. Hence, remote eye tracking systems usually have a limited operating range. This contribution presents a novel autofocus setup for a small and mobile remote gaze tracking system that enables a clear eye image acquisition in a large operating range. Therefore, our setup uses a miniature liquid lens to achieve smallest possible focusing latencies and installation space. Using this technology, we extended the eye tracking system's operating range to distances from 0.6 m up to 1.3 m, with a mean accuracy of 0.45° in 4 exemplary working distances.