n of table 1, that 
r 
5. CONCLUSIONS References from Other Literature: 
This study shows that the error of the tracking device cannotbe [6] Azuma, R.; Baillot, Y.; Behringer, R.; Feiner, S.; Julier, 
ignored. The results differ significantly between calibration S.; MacIntyre, B.: "Recent Advances in Augmented 
with and without assuming an error model for the tracker Reality", IEEE Computer Graphics and Applications 21, 6 
measurements. Especially a second tracking device improves (Nov/Dec 2001), 34-47. 
the reproducibility of the calibration results for a see-through 
f observations is 
bird is left away, 
free. Then, using 
ed consequently. 
icant differences 
thod proposed in 
with column four 
rease of accuracy 
(B). This is the 
nage points are 
ce of the tracker 
' table 2. When 
or free and only 
ts are still better 
points necessary 
y ten points, the 
Otherwise, there 
tion when using 
> accuracy of the 
f the parameters 
to the display- 
qe] 
tandard 
ation (B) 
8.2841 
7.1293 
0 
0 
0.0053 
0.0107 
0.0482 
0.0679 
0.0221 
0.0632 
  
cker is assumed 
30 
32.4118 
6.8377 
0 
0 
0.0068 
0.0035 
0.0085 
0.0764 
0.0077 
0.0813 
  
bserved image 
ed parameter. 
augmented reality system. 
6. REFERENCES 
References from websites: 
[1] 
[2] 
Ascension Technology Cooperation: "Flock of Birds", 
http://www .ascension-tech.com/products/flockofbirds, 
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Colaborative Research Center 461, http://www- 
sfb461.physik.uni-karlsruhe.de/, (cited 02.02.02). 
References from Books: 
[3] 
[4] 
[5] 
Buchholtz, A.; Rüger, W.: "Photogrammetrie: Verfahren 
und Geräte", VEB Verlag für Bauwesen Berlin, dritte 
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Gamma, E.; Helm, R.; Johnson, R.; Vlissides, J.: Design 
Patterns, Addison Wesley Publishing Company, ISBN 0- 
201-63361-2, Bonn, 1995. 
Wolf, H., Ausgleichungsrechnung I, Formeln zur 
praktischen Anwendung, 2. Auflage, Dümmlerverlag, 
Bonn, 1994. 
[7] 
[8] 
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[11] 
—539— 
Ghazisadedy, M.; Adamczyk, D.; Sandlin, D. J.; Kenyon, 
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Janin, A. L.; Mizell, D.; Caudell, T.: "Calibration of head- 
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Kindratenko, V.: "A survey of electromagnetic position 
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Raab, F.; Blood, E.; Steiner, T.; Jones, H.: "Magnetic 
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Tuceryan, M.; Navab, N.: "Single point active alignment 
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