Model-based Hybrid Tracking for Medical Augmented Reality

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dc.contributor.authorFischer, Janen_US
dc.contributor.authorEichler, Michaelen_US
dc.contributor.authorBartz, Dirken_US
dc.contributor.authorStraßer, Wolfgangen_US
dc.contributor.editorMing Lin and Roger Hubbolden_US
dc.date.accessioned2014-01-27T10:47:24Z
dc.date.available2014-01-27T10:47:24Z
dc.date.issued2006en_US
dc.description.abstractCamera pose estimation is one of the most important, but also one of the most challenging tasks in augmented reality. Without a highly accurate estimation of the position and orientation of the digital video camera, it is impossible to render a spatially correct overlay of graphical information. This requirement is even more crucial in medical applications, where the virtual objects are supposed to be correctly aligned with the patient. Many medical AR systems use specialized tracking devices, which can be of limited suitability for real-world scenarios. We have developed an AR framework for surgical applications based on existing medical equipment. A surgical navigation device delivers tracking information measured by a built-in infrared camera system, which is the basis for the pose estimation of the AR video camera. However, depending on the conditions in the environment, this infrared pose data can contain discernible tracking errors. One main drawback of the medical tracking device is the fact that, while it delivers a very high positional accuracy, the reported camera orientation can contain a relatively large error. In this paper, we present a hybrid tracking scheme for medical augmented reality based on a certified medical tracking system. The final pose estimation takes the inital infrared tracking data as well as salient features in the camera image into account. The vision-based component of the tracking algorithm relies on a pre-defined graphical model of the observed scene. The infrared and vision-based tracking data are tightly integrated into a unified pose estimation algorithm. This algorithm is based on an iterative numerical optimization method. We describe an implementation of the algorithm and present experimental data showing that our new method is capable of delivering a more accurate pose estimation.en_US
dc.description.seriesinformationEurographics Symposium on Virtual Environmentsen_US
dc.identifier.isbn3-905673-33-9en_US
dc.identifier.issn1727-530Xen_US
dc.identifier.urihttps://doi.org/10.2312/EGVE/EGVE06/071-080en_US
dc.publisherThe Eurographics Associationen_US
dc.subjectCategories and Subject Descriptors (according to ACM CCS): H.5.1 [Information Interfaces and Presentation]: Artificial, augmented, and virtual realities; I.4.8 [Image Processing and Computer Vision]: Tracking; J.3 [Life and Medical Sciences]: Medical information systemsen_US
dc.titleModel-based Hybrid Tracking for Medical Augmented Realityen_US
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EGVE06: 12th Eurographics Symposium on Virtual Environments