NCSA  CAVERNUS

Tracker Calibration Libraries

Electromagnetic trackers are sensitive to electrically or magnetically conductive objects. If there is a metal near the electromagnetic tracker's transmitter or receiver, the transmitter signals are distorted and the resulting position/orientation measurements contain errors. There are two components that contribute to the total error: static error and dynamic error. Static errors as high as 4 feet have been observed near the maximum range of the tracker. The purpose of the document, Electromagnetic Tracker Calibration by Volodymyr Kindratenko of NCSA, is to collect all the information related to the problem of correcting the static error.

NCSA libTrCalibr 2.00
    NCSA libTrCalibr 2.00 implements two different techniques to calibrate electromagnetic tracking systems: high order polynomial fit and interpolation on an irregularly spaced tracked grid. This is in contrast to EVL's approach where the measurements for the calibration table need to be done on the regular grid in the tracked space. Both techniques perform calibration of both position and rotation distortions.

Tracker Calibration Option in VRCO trackd
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The National Center for Supercomputing Applications
University of Illinois at Urbana-Champaign

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Last modified: February 24, 2000