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Dr. Christian Perwass
Former Member
| Homepage: |
| Projects: |
| Geometric Algebras and the Perception-Action Cycle | more... |
| 2D-3D Pose Estimation | more... |
| Estimation from Uncertain Data in Geometric Algebra | more... |
| PACLib - The Perception-Action Components Library | more... |
| Teaching Geometric Algebra | more... |
| VISATEC | more... |
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| Awards: |
| 2003 | DAGM-Preis 2003, DAGM | Perwass, C., Banarer, V., Sommer, G. |
| 2005 | DAGM-Preis 2005, DAGM | Perwass, C., Gebken, C., Sommer, G. | | |
| Publications: | | 2006 | The twist representation of free-form objects
Sommer, G., Rosenhahn, B., Perwass, C.
In R. Klette, R. Kozera, L. Noakes and J. Weickert (Eds.), Geometric Properties from Incomplete Data, Computational Imaging and Vision, Vol. 31, pp 3-22, Springer-Verlag, Berlin, Heidelberg, 2006 | PDF , BibTeX |
| 2006 | Uncertain geometry with circles, spheres and conics
Perwass, C., Förstner, W.
In Geometric Properties from Incomplete Data, R. Klette, R. Kozera, L. Noakes and J. Weickert (Eds.), Computational Imaging and Vision, Vol. 31, pp. 23-41, Springer-Verlag, Berlin, Heidelberg, 2006. | PDF , BibTeX |
| 2006 | Dense optic flow with a Bayesian occlusion model
Köser, K., Perwass, C., Sommer, G.
In Spatial Coherence for Visual Motion Analysis: First International Workshop, SCVMA 2004, Prague, Czech Republic, May 15, 2004. W. James MacLean (Ed.), LNCS 3667, pp. 127-139, Springer-Verlag, Berlin, Heidelberg, 2006. | PDF , BibTeX |
| 2006 | Geometry and kinematics with uncertain data
Perwass, C., Gebken, C., Sommer, G.
In Proc. 9th European Conference on Computer Vision, ECCV 2006, Graz, Austria, May 2006, A. Leonardis, H. Bischof and A. Pinz (Eds.), LNCS 3951, pp. 225-237, Springer-Verlag, Berlin, Heidelberg, 2006 | PDF , BibTeX |
| 2006 | The inversion camera model
Perwass, C., Sommer, G.
In Proc. DAGM 2006, 28. Symposium für Mustererkennung, Berlin, Sept. 2006, K. Franke et al. (Eds.) Pattern Recognition, LNCS 4174, pp. 647-656, Springer-Verlag, Berlin, Heidelberg, 2006 | PDF , BibTeX |
| 2006 | Three vector generation of crystal space groups in geometric algebra
Hitzer, E., Perwass, C.
Bulletin of the Society for Science on Form, 1(21): 55-56, 2006 | PDF , BibTeX |
| 2006 | Space group visualizer for monoclinic space groups
Perwass, C., Hitzer, E.
Bulletin of the Society for Science and Form, 1(21):38-39, 2006. | PDF , BibTeX |
| 2006 | Perspective pose estimation from uncertain omnidirectional image data
Gebken, C., Tolvanen, A., Perwass, C., Sommer, G.
In Proc. 18th International Conference on Pattern Recognition, ICPR 2006, August 20-24, Hong-Kong, vol.1, pp. 793-796, 2006 | PDF , BibTeX |
| 2006 | Increasing pose estimation performance using multi-cue integration
Viksten, F., Söderberg, R., Nordberg, K., Perwass, C.
In Proc. IEEE Int. Conference on Robotics and Automation, ICRA06, Orlando, FL, USA, May, 2006 | PDF , BibTeX |
| 2005 | Pose estimation of 3D free-form contours
Rosenhahn, B., Perwass, C., Sommer, G.
Int. Journal of Computer Vision 62(3): 267-289, 2005 | PDF , BibTeX |
| 2005 | Twists - An operational representation of shape
Sommer, G., Rosenhahn, B., Perwass, C.
In Proceedings IWMM 2004 and GIAE 2004 - Computer Algebra and Geometric Algebra with Applications, H. Li, P.J. Olver and G. Sommer (Eds.), LNCS 3519, pp. 278-297, Springer-Verlag, Berlin, Heidelberg, 2005 | PDF , BibTeX |
| 2005 | Estimation of geometric entities and operators from uncertain data
Perwass, C., Gebken, C., Sommer, G.
In 27. Symposium für Mustererkennung, DAGM 2005, Wien, 29.8.-2.9.05, LNCS Series, Vol. 3663, pp. 459-467, Springer-Verlag, Berlin, Heidelberg, 2005 | PDF , BibTeX |
| 2005 | Projective model for central catadioptric cameras using Clifford algebra
Tolvanen, A., Perwass, C., Sommer, G.
In 27. Symposium für Mustererkennung, DAGM 2005, Wien, 29.8.-2.9.2005, LNCS Series, Vol. 3663, pp. 192-199, Springer-Verlag, Heidelberg, Berlin, 2005 | PDF , BibTeX |
| 2005 | Crystal cell and space lattice symmetries in Clifford geometric algebra
Hitzer, E., Perwass, C.
In Proc. International Conference on Numerical Analysis and Applied Mathematics, TE. Simos, G. Sihoyios, and C. Tsitouras (Eds.), pp. 922-925, Wiley-VCH, Weinheim, 2005 | PDF , BibTeX |
| 2005 | Full geometric description of all symmetry elements of crystal space groups by the suitable choice of only three vectors for each Bravais cell or crystal family
Hitzer, E., Perwass, C.
In Proceedings of the International Symposium on Advanced Mechanical Engineering, between University of Fukui (Japan), Pukyong National University (Korea) and University of Shanghai for Science and Technology (China), 23-26 Nov. 2005, pp. 19-25, 2005 | PDF , BibTeX |
| 2005 | Interactive visualization of full geometric description of crystal space groups
Perwass, C., Hitzer, E.
In Proceedings of the International Symposium on Advanced Mechanical Engineering, between University of Fukui (Japan), Pukyong National University (Korea) and University of Shanghai for Science and Technology (China), 23-26 Nov. 2005, pp. 276-282, 2005
| PDF , BibTeX |
| 2004 | Free-form pose estimation by using twist representations
Rosenhahn, B., Perwass, C., Sommer, G.
Algorithmica, 38:91-113, 2004. | PDF , BibTeX |
| 2004 | The Twist Representation of Shape
Sommer, G., Rosenhahn, B., Perwass, C.
Technical Report Number 0407, Christian-Albrechts-Universität zu Kiel, Institut für Informatik und Praktische Mathematik, July 2004. | PDF , BibTeX |
| 2004 | Analysis of Local Image Structure using Intersections of Conics
Perwass, C.
Technical Report Number 0403, Christian-Albrechts-Universität zu Kiel, Institut für Informatik und Praktische Mathematik, July 2004. | PDF , BibTeX |
| 2004 | Foundations about 2D-3D pose estimation
Rosenhahn, B., Perwass, C., Sommer, G.
CVonline, R. Fisher (ed.), 2004. | PDF , BibTeX |
| 2004 | Crystal cells in geometric algebra
Hitzer, E., Perwass, C.
In Proceedings of International Symposium on Advanced Mechanical Engineering, November 2004, Dept. of Mechanical Engineering, University of Fukui, Japan, pp. 290-295, 2004. | PDF , BibTeX |
| 2004 | Teaching gometric algebra with CLUCalc
Perwass, C.
In Proc. RIMS Symposium - Innovative Teaching in Mathematics with Geometric Algebra, Nov. 20-23, 2003, Kyoto, E. Hitzer (Ed.),Kokyuroku, Vol. 1378, ISSN 1880-2818, pp. 33-50, RIMS, Kyoto, 2004. | PDF , BibTeX |
| 2004 | Junction and corner detection through the extraction and analysis of line segments
Perwass, C.
In Proceedings Combinatorial Image Analysis, 10th International Workshop, IWCIA 2004, Auckland, New Zealand, R. Klette and J. Zunic (eds.), LNCS 3322, Springer-Verlag, pp 568-582, 2004. | PDF , BibTeX |
| 2003 | The hypersphere neuron
Banarer, V., Perwass, C., Sommer, G.
In Proc. 11th European Symposium on Artificial Neural Networks, ESANN 2003, Bruges, pp. 469-474. d-side publications, Evere, Belgium, 2003 | PDF , BibTeX |
| 2003 | Implementation of a Clifford algebra co-processor design on a field programmable gate array
Perwass, C., Gebken, C., Sommer, G.
In R. Ablamowicz, Editor, 6th International Conference on Clifford Algebras, and Applications, , Cookeville, TN, CLIFFORD ALGEBRAS: Application to Mathematics, Physics, and Engineering, pp. 561-575, Birkhäuser, Boston, Progress in Mathematical Physics, 2003 | PDF , BibTeX |
| 2003 | An iterative Bayesian technique for dense image point matching
Perwass, C., Sommer, G.
In R.P. Würtz and K. Lappe, editors, Dynamic Perception, pp. 283-288, Workshop of GI section 1.0.4 "Image Understanding" and the European Networks MUHCI and ECOVISION, Ruhr-University Bochum, Nov. 2002, IOS Press Infix, 2003 | PDF , BibTeX |
| 2003 | An introduction to the VISATEC project
Perwass, C., Pauli, J., Sommer, G.
Künstliche Intelligenz, 3:69-71, 2003. | PDF , BibTeX |
| 2003 | Pose estimation of free-form surface models
Rosenhahn, B., Perwass, C., Sommer, G.
In 25. Symposium für Mustererkennung, DAGM 2003, Magdeburg, Vol. 2781 of LNCS, pp. 574-581, Springer-Verlag, Berlin, 2003. | PDF , BibTeX |
| 2003 | Design of a multilayered feed-forward neural network using hypersphere neurons
Banarer, V., Perwass, C., Sommer, G.
In Proc. 10th Int. Conf. Computer Analysis of Images and Patterns, CAIP 2003, Groningen, The Netherlands, August 2003, In N. Petkov and M.A. Westenberg, editors, Vol. 2756 of LNCS, pp. 571-578, Springer-Verlag, 2003. | PDF , BibTeX |
| 2003 | Modeling adaptive deformations during free-form pose estimation
Rosenhahn, B., Perwass, C., Sommer, G.
Proc. 10th Int. Conf. Computer Analysis of Images and Patterns 2003, Groningen, the Netherlands, August 2003 , In N. Petkov and M.A. Westenberg, Vol. 2756 of LNCS, pp. 664-672, Springer-Verlag, 2003. | PDF , BibTeX |
| 2003 | Aspects of Geometric Algebra in Euclidean, Projective and Conformal Space
Perwass, C., Hildenbrand, D.
Technical Report Number 0310, Christian-Albrechts-Universität zu Kiel, Institut für Informatik und Praktische Mathematik, September 2003 | PDF , BibTeX |
| 2003 | Spherical decision surfaces using conformal modelling
Perwass, C., Banarer, V., Sommer, G.
25. Symposium für Mustererkennung, DAGM 2003, Magdeburg, Vol. 2781 of LNCS, pp. 9-16, Springer-Verlag, Berlin, 2003 | PDF , BibTeX |
| 2002 | Pose Estimation of 3D Free-form Contours
Rosenhahn, B., Perwass, C., Sommer, G.
Technical Report 0207, Christian-Albrechts-Universität zu Kiel, Institut für Informatik und Praktische Mathematik, August 2002 | PDF , BibTeX |
| 2002 | Pose estimation of 3D free-form contours in conformal geometry
Rosenhahn, B., Perwass, C., Sommer, G.
In D. Kenwright, editor, Proceedings of Image and Vision Computing, IVCNZ, Auckland, NZ, pp. 29-34. 2002 | PDF , BibTeX |
| 2002 | Numerical evaluation of versors with Clifford algebra
Perwass, C., Sommer, G.
In L. Dorst, C. Doran and J. Lasenby, editors, Applications of Geometric Algebra in Computer Science and Engineering, pp. 341-350. Proc. AGACSE 2001, Cambridge, UK, Birkhäuser Boston, 2002 | PDF , BibTeX |
| 2002 | Dense Image Point Matching through Propagation of Local Constraints
Perwass, C., Sommer, G.
Technical Report 0205, Christian-Albrechts-Universität zu Kiel, Institut für Informatik und Praktische Mathematik, 2002 | PDF , BibTeX |
| 2001 | A unified description of multiple view geometry
Perwass, C., Lasenby, J.
In G. Sommer, editor, Geometric Computing with Clifford Algebra, pp. 337-369. Springer-Verlag, Heidelberg, 2001 | PDF, PS , BibTeX |
| 2001 | 3D-reconstruction from vanishing points
Perwass, C., Lasenby, J.
In G. Sommer, editor, Geometric Computing with Clifford Algebra, pp. 371-392. Springer-Verlag, Heidelberg, 2001 | PDF, PS , BibTeX |
| 2001 | A fuzzy logic algorithm for dense image point matching
Perwass, C., Sommer, G.
In S.S. Beauchemin, F. Nouboud and G. Roth, editors, 14th International Conference on Vision Interface, Ottawa, Canada, pp. 39-46. Canadian Image Processing and Pattern Recognition Society, 2001 | PDF , BibTeX |
| 2000 | 22. DAGM-Symposium Mustererkennung 2000
Sommer, G., Krüger, N., Perwass, C.
Springer-Verlag, Heidelberg, 2000 | BibTeX |
| 2000 | Applications of Geometric Algebra in Computer Vision
Perwass, C.
Dissertation, Cambridge University, 2000. | PDF , BibTeX |
| 2000 | A Geometric Algebra Approach to 3D-Reconstruction from Vanishing Points
Perwass, C., Lasenby, J.
TR CUED/F - INFENG/TR.364, Cambridge University, Engineering Department, February 2000. | PDF , BibTeX |
| 1998 | A Geometric Derivation of the Trifocal Tensor and its Constraints
Perwass, C., Lasenby, J.
Technical Report CUED/F - INFENG/TR.331, Cambridge University Engineering Department, 1998. | PDF, PS , BibTeX |
| 1998 | A Geometric Analysis of the Trifocal Tensor
Perwass, C., Lasenby, J.
In R. Klette, G. GimelŽfarb and R. Kakarala, editors, Image and Vision Computing New Zealand, pp. 157-162. The University of Auckland, 1998 | PDF , BibTeX |
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