Real-Time Hand and Head Tracking for Virtual Environments Using Infrared Beacons
CAPTECH '98 Proceedings of the International Workshop on Modelling and Motion Capture Techniques for Virtual Environments
Correction of Location and Orientation Errors in Electromagnetic Motion Tracking
Presence: Teleoperators and Virtual Environments
Applying natural neighbor coordinates for electromagnetic tracker calibration
ISCIS'06 Proceedings of the 21st international conference on Computer and Information Sciences
Näprä: affordable fingertip tracking with ultrasound
EGVE'05 Proceedings of the 11th Eurographics conference on Virtual Environments
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Electro-magnetic tracking systems are in wide-spread use for measuring 6D positions. However, their accuracy is impaired seriously by distortions of the magnetic fields caused by many types of metal which are omnipresent at real sites. We present a fast and robust method for ``equalizing'' those distortions win order to yield accurate tracking. The algorithm is based on global scattered data interpolation using a ``snap-shot'' of the magnetic field's distortion measured once in advance. The algorithm is fast (it does not introduce any further lag in the data flow), robust, the samples of the field's ``snap-shot'' can be arranged in any way, and it is easy to implement. The distortion is visualized in an intuitive way to provide insight into its nature, and the correction algorithm is evaluated in terms of accuracy and performance. Finally, a qualitative comparison of the suceptibility of a Polhemus and an Ascension tracking system is carried out.