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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004 
multiple objects are present in the image and how the 
combinations of multiple solutions each for a different object 
affect the accuracy of the results. 
REFERENCES 
Chia K., A. Cheok, S. Prince 2002 Online 6 DOF Augmented 
Reality Registration from Natural Features, International 
Symposium on Mixed and Augmented Reality (ISMAR'02) 
September 30 - October 01, 2002 Darmstadt, Germany pp. 305- 
313. 
Georgiadis Ch., A. Stefanidis, and P. Agouris, 2002 Fast 
Recovery of Image Orientation using Virtual Urban Models, 
International Archives of Photogrammetry & Remote Sensing, 
34 (5), Corfu, pp. 161-166. 
Petsa, E., P. Patias, 1994. Formulation and assessment of 
straight line based algorithms for digital photogrammetry. 
International Archives of Photogrammetry and Remote Sensing, 
30(5):310-317. 
Simon G., M.-O Berger. 2002. Pose Estimation for Planar 
Structures. [EEE Computer Graphics and Applications, 22 (2), 
pp. 46-53. 
Stefanidis A., P. Agouris, M. Bertoloto, J. Carswell, and Ch. 
Georgiadis, 2002. Scale- and Orientation-Invariant Scene 
Similarity Metrics for Image Queries, International Journal of 
Geographical Information Science, 16(8), pp. 749-772. 
Stefanidis A., Ch Georgiadis., P. Agouris 2003. Registration of 
Urban Imagery to VR Models Through Radiometric Queries 
Videometrics VII, SPIE Proceedings Vol. 5013, Santa Clara, 
CA, pp. 176-185. 
ACKNOWLEDGEMENTS 
This work is supported by the National Science Foundation 
through grant ITR-0121269 and by the National Geospatial 
Intelligence Agency (NGA) through NMA 401-02-1-2008. We 
would also like to acknowledge Dr. Arie Croitoru, for providing 
us with the simulation software.