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Registration tasks for a hybrid tracking system for medical augmented reality

: Schwald, B.; Seibert, H.

Skala, V. ; European Association for Computer Graphics -EUROGRAPHICS-:
WSCG 2004, International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision. Proceedings. Part 3
Plzen: University of West Bohemia, 2004 (Journal of WSCG 12,3)
ISSN: 1213-6972
International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision (WSCG) <12, 2004, Plzen, Czech Republic>
Fraunhofer IGD ()
hybrid tracking system; registration; virtual and augmented reality (VR/AR); interaction

Tracking technologies for medical Virtual or Augmented Reality (VR/AR) applications have to fulfill demanding requirements. A hybrid tracking system can merge positive attributes of different tracking technologies, for example optical and electromagnetic, and try to compensate the bad ones. The alignment of two or more tracking systems by means of transforming all measured data from different systems into one common coordinate system is a fundamental precondition. Usage and processing of time stamps assigned to each measurement is a very effective element in order to achieve a higher accuracy in the alignment procedure and during later use. The algorithms for the alignment of tracking systems can also be used for the registration of the patient, another typical task in medical VR/AR applications. This paper describes both procedures in detail, including algorithms and results from test sequences. The representative tests illustrate, that the proposed algorithms provide satisfying results. An overview of the integration of the hybrid tracking system in a medical AR system is given. Adverse conditions like environmental influences on the tracking systems and the identification of corresponding measurements of two tracking systems are discussed.