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OSGAR: a scene graph with uncertain transformations

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3 Author(s)
Coelho, E.M. ; Coll. of Comput., Georgia Inst. of Technol., Atlanta, GA, USA ; Julier, S.J. ; Maclntyre, B.

An important problem for augmented reality is registration error. No system can be perfectly tracked, calibrated or modeled. As a result, the overlaid graphics are not aligned perfectly with objects in the physical world. This can be distracting, annoying or confusing. In this paper, we propose a method for mitigating the effects of registration errors that enables application developers to build dynamically adaptive AR displays. Our solution is implemented in a programming toolkit called OSGAR. Built upon OpenSceneGraph (OSG), OSGAR statistically characterizes registration errors, monitors those errors and, when a set of criteria are met, dynamically adapts the display to mitigate the effects of the errors. Because the architecture is based on a scene graph, it provides a simple, familiar and intuitive environment for application developers. We describe the components of OSGAR, discuss how several proposed methods for error registration can be implemented, and illustrate its use through a set of examples.

Published in:

Mixed and Augmented Reality, 2004. ISMAR 2004. Third IEEE and ACM International Symposium on

Date of Conference:

2-5 Nov. 2004