Summary of full paper, presented at IWAR'99, San Francisco, October 20-21, 1999
The full article is published in the printed "Proceedings of the 2nd IWAR'99" and copyright protected by IEEE Computer Society.

Building a Hybrid Tracking System: Integration of Optical and Magnetic Tracking

Thomas Auer, Axel Pinz

Computer Graphics and Vision
Graz University of Technology


Multi-user augmented reality systems require excellent registration in order to allow cooperation among the users. In order to satisfy this need we have built a hybrid tracking system integrating magnetic and optical tracking. Prediction from the magnetic tracker allows for rather small search areas in the optical tracking subsystem. Our hybrid tracking system is faster than a standalone optical tracking system and outperforms a magnetic system in terms of accuracy and jitter.

Links and Content

The full paper (as found in the proceedings) describes in detail the tracking system used in the Studierstube augmented reality system. A brief description of the Studierstube can be found on the project web pages, and the tracking system is described here. Please refer to the full paper for an in-depth description. In addition, we provide color versions of the images in the proceedings.

The Studierstube is a joint project with the Institute of Computer Graphics at the Vienna University of Technology. The homepage of our Viennese partners can be found here.

This image depicts the optical tracking system. Black triangles denote the prediction of the magnetic tracker, and red line sindicate tracked corners. Selected features (for pose computation) are marked by green circles and finally the reprojected features are denote by blue crosses.

The augmented reality helmet is depicted here. It integrates the magnetic sensor (on top of the helmet), two CCD cameras and the display.

Calibration of the helmet in the Studierstube.

Copyright (c) 1999 IEEE. Reprinted, with permission, from IWAR'99 proceedings.

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