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OSGAR: A scene graph with uncertain transformations

Coelho, EM; MacIntyre, B; Julier, SJ; (2004) OSGAR: A scene graph with uncertain transformations. In: ISMAR 2004: Proceedings of the Third IEEE and ACM International Symposium on Mixed and Augmented Reality. (pp. 6 - 15).

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An important problem for augmented reality is registration error. No system can be perfectly tracked, calibrated or modeled. As a result, the overlaid graphics will not align 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. © 2004 IEEE.

Type:Proceedings paper
Title:OSGAR: A scene graph with uncertain transformations
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Computer Science

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