Tag Archives: OSGAR

OSGAR: A Scene Graph with Uncertain Transformations

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Abstract
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.

Reference:
Enylton Machado Coelho, Blair MacIntyre, and Simon Julier (2004) “OSGAR: A Scene Graph with Uncertain Transformations” To appear in International Symposium on Mixed and Augmented Reality (ISMAR04), November 2-5, 2004, Washington, D.C., USA.

DART and OSGAR to be presented and demonstrated at ISMAR 2004

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During ISMAR 2004, we will present a paper on the design of OSGAR (our AR software architecture that supports uncertain transformations).  Integrating uncertain transformations into a 3D scene graph is vital for building AR applications that function in realistic environments.  OSGAR provides a high-level abstraction to programmers for representing uncertainty and building applications that adapt as uncertainty changes. We will demonstrate OSGAR as part of the ISMAR demo session.  (more information)

During the ISMAR demo session, we will also demonstrate DART‘s advanced capabilities for handling multiple sensors and fusing them together in a simple and useful way.  (more information)