In this work we investigate building indoor location based applications for a mobile augmented reality system. We believe that augmented reality is a natural interface to visualize spacial information such as position or direction of locations and objects for location based applications that process and present information based on the user´s position in the real world. To enable such applications we construct an indoor tracking system that covers a substantial part of a building. It is based on visual tracking of fiducial markers enhanced with an inertial sensor for fast rotational updates. To scale such a system to a whole building we introduce a space partitioning scheme to reuse fiducial markers throughout the environment. Finally we demonstrate two location based applications built upon this facility, an indoor navigation aid and a library search application.
G. Reitmayr, D. Schmalstieg: "Location Based Applications for Mobile Augmented Reality"; in: "Proceedings of the 4th Australasian User Interface Conference", Australian Computer Society, 2003, ISBN: 0-909925-96-8, 65 - 73.
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