A real-time integrated calibration system for virtual reality environments has been developed that enables accurate electromagnetic tracking of user motions. Electromagnetic tracking systems suffer degradation in accuracy due to the presence of metals and other electromagnetic distortions in the environment. Calibration of the virtual environment to account for these distortions is essential for VR applications in engineering where correlation between the virtual environment and the physical world is important. The major contribution of the paper is the presentation of a comprehensive methodology for calibrating the VR space, the numerical/mathematical techniques proposed for the calibration, and case studies for calibration accuracy and execution time to enable using these techniques in real time in an integrated setup.

Issue Section:
Technical Papers
Keywords:
virtual reality, engineering computing, calibration, real-time systems, tracking, electromagnetic fields
Topics:
Calibration, Interpolation, Virtual reality, Algorithms, Errors
1.
Angster, S. R., Gowda, S., and Jayaram. S., 1996, “Using VR for Design and Manufacturing Applications-A Feasibility Study,” ASME Computers in Engineering Conference.
2.
Vance, J., 1998, “Current Applications of Virtual Reality to Engineering Problems,” Chapter in Applied Virtual Reality SIGGRAPH Course Notes, Proceedings of the ACM SIGGRAPH.
3.
Dani
,
T.
, and
Gadh
,
R.
,
1997
, “
Creation of Concept Shape Designs via a Virtual Reality Interface
,”
Comput.-Aided Des.
,
29
(
8
), pp.
555
–
563
.
4.
Jayaram
,
S.
,
Jayaram
,
U.
,
Wang
,
Y.
,
Tirumali
,
H.
,
Lyons
,
K.
, and
Hart
,
P.
,
1999
, “
VADE: A Virtual Assembly Design Environment
,”
IEEE Comput. Graphics Appl.
,
19
(
6
), pp.
44
–
50
.
5.
Meyer,K., Applewhite, H. L., and Biocca, F. A., 1992, “A Survey of Position Trackers,” Presence: Teleoperators, and Virtual Environments, 1(2), pp. 173–200.
6.
Williams, M., 1993, “A Comparison of Two Examples of Magnetic Tracker Systems,” Proceedings, Virtual Interfaces: Research and Applications (pp. 14/1-19). Neuilly sur Seine, France: AGARD.
7.
Raab
,
F. H.
,
Blood
,
E. B.
,
Steiner
,
T. O.
, and
Jones
,
H. R.
,
1979
, “
Magnetic Position and Orientation Tracking System
,”
IEEE Trans. Aerosp. Electron. Syst.
,
AES-15
(
5
), pp.
709
–
718
.
8.
Kalawsky, R. S., 1993, The Science of Virtual Reality and Virtual Environments, Addison-Wesley Publishing Co. Reading, Massachusetts.
9.
Jayaram
,
S.
,
Vance
,
J.
,
Gadh
,
R.
,
Jayaram
,
U.
, and
Srinivasan
,
H.
,
2001
, “
Assessment of VR Technology and its Applications to Engineering Problems
,”
Journal of Computing and Information Science in Engineering
,
1
,
March
, pp.
72
–
83
.
10.
Ikits, M., Brederson, J.D., Hansen, C.D., and Hollerbach, J.M., 2001, “An Improved Calibration Framework for Electromagnetic Tracking Devices,” Proc Virtual Real Annu Int Symp, pp. 63–70.
11.
Nixon, M. A., McCallum, B. C., Fright, W. R., and Price, N. B., 1998, “The Effects of Metals and Interfering Fields on Electromagnetic Trackers,” Presence, 7(2), April, pp. 204–218.
12.
Bryson, S., 1992, “Measurement and Calibration of Static Distortion of Position Data from 3D Trackers,” Proceedings SPIE-Stereoscopic Displays and Applications III, 1669, pp. 244–255.
13.
Bryson, S., and Fisher, S. S., 1990, “Defining, Modeling, and Measuring System Lag in Virtual Environments,” Proceedings SPIE-Stereoscopic Displays and Applications, 1256, pp. 98–109.
14.
Burdea, G., and Coiffet., P., 1994, Virtual Reality Technology, John Wiley & Sons.
15.
Bryson, S., 1993, “Measurement and Calibration of Static Distortion for Position Data from 3D Trackers,” SIGGRAPH-20th International Conference on Computer Graphics and Interactive Techniques (August).
16.
Ghazisaedy, M., et al., 1995, “Ultrasonic Calibration of Magnetic Tracker in a Virtual Reality Space,” VRAIS, pp. 179–187.
17.
Briggs, W., 1999, “Magnetic Calibration by Tetrahedral Interpolation,” Proceedings of the NIST-ASME Industrial Virtual Reality Symposium. Vol. MH-5/MED-9. pp. 27–32. Chicago, IL, Nov.
18.
Livingston, M. A., and State, A., 1998, “Magnetic Tracker Calibration for Improved Augmented Reality Registration,” Presence: Teleoperators and Virtual Environments, 7(2), pp. 204–218.
19.
Kindratenko, V.,1999, “ Calibration of Electromagnetic Tracking Devices,” Virtual Reality: Research, Development, and Applications, 4, Nov., pp. 139–150.
20.
Liang, J., Shaw, C., and Green, M., 1991, “On Temporal-Spatial Realism in the Virtual Reality Environment,” Proceedings, UIST Fifth Annual Symposium in User Interface Software and Technology, pp. 19–25.
21.
Stone, R. J., 1996, “Position and Orientation Sensing in Virtual Environments,” Sensor Review, 16(1), pp. 40–46.
22.
Gowda, S., 1996, “The Calibration of Virtual Prototypes for Engineering Design and Analysis,” Master’s Thesis, Washington State University.
23.
Nielson, G. M., Hagen, H., and Muller, H., 1997, “Scientific Visualization: Overviews, Methodologies, and Techniques,” IEEE Computer Society, April, pp. 97–105.
24.
Kindratenko, V., and Bennett. A., 2000, “Evaluation of Rotation Correction Techniques for Electromagnetic Position Tracking Systems,” Proceedings of the Virtual Environments 2000 Eurographics Workshop, Amsterdam, The Netherlands, June.
25.
Kenwright
,
D. N.
, and
Lane
,
D. A.
,
1996
, “
Interactive Time-Dependent Particle Tracing Using Tetrahedral Decomposition
,”
IEEE Trans. Vis. Comput. Graph.
,
2
(
2
), Jun., pp.
120
–
129
.
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