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F. Ledermann, G. Reitmayr, D. Schmalstieg:
"Dynamically Shared Optical Tracking";
Vortrag: First IEEE International Workshop on ARTToolKit (ART02), Darmstadt, Germany; 29.09.2002; in: "Proceedings of the First IEEE International Workshop on ARTToolKit (ART02)", (2002), ISBN: 0-7803-7680-3.

Optical Tracking using ARToolkit provides us with the
base technology for a wealth of Augmented Reality applications.
However, marker-based optical tracking using a
single camera has some drawbacks. Markers must be fully
visible to the camera all the time to produce tracking output
- occlusion by other objects and limited camera field
of view constrain the area that can be effectively tracked by
ARToolkit. In our approach to improve tracking availability,
tracking data from multiple hosts is shared across the
network. Pairwise camera-to-camera relationships are established
automatically, as soon as any marker is seen by
two cameras, independent of the cameras´ placement (e.g.
cameras worn by a user or mounted at a "hot spot" location
to improve tracking in that area). The setup is completely
dynamic: both cameras can be continuously moving,
and there is no "special marker" that must be seen by both
cameras - as soon as any one marker in the system is visible
to both cameras, all missing tracking information can
be calculated from the data sent over the network. In this
paper, we describe such a configuration for multiple hosts
in detail, as well as special aspects such as automatically
selecting the best marker to use as a reference point, a description
of the system´s data flow, scalability and accuracy
issues and future work such as automatic configuration of
the system.

http://www.ims.tuwien.ac.at/media/documents/publications/SharedTrackingFinal.pdf