Hall of Visitors : 1998

Brian Wyvill Afiliation : University of Calgary, Department of Computer Science Address: 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4 Phone: (403) 220-6015 Fax: (403) 284-4707 E-mail: blob@cpsc.ucalgary.ca Research area : Computer animation, solid modelling, scientific visualisation Period of visit : October 1998

Brian Wyvill is a full professor in the department of computer science at the University of Calgary. After gaining his PhD in the UK in 1975, he worked at the Royal College of Art as a post doc. in London to produce a computer animation system, which he used to make some sequences for the original Alien movie. Since coming to Calgary in 1981, Brian's research has concentrated on building the Graphics and Animation and visualization system. Brian has directed several animations (two shown at SIGGRAPH) that feature implicit modelling. Recent work is in the areas of implicit surface modeling, animation techniques and scientific visualization.

Currently he is interested in a very efficient adaptive tiling algorithms for implicit surfaces and CSG, as well as new techniques for warping, blending and collision detection using implicit surfaces.

Bart ter Haar Romeny Afiliation : Image Sciences Institute, University Hospital Utrecht Address: Heidelberglaan 100, AZU-room E01.334, 3584 CX Utrecht, The Netherlands Phone: +31 30 250 8197 Fax: +31 30 251 3399 E-mail: bart@isi.uu.nl Research area : Computer Vision Period of visit : July and August 1998

Bart M. ter Haar Romeny is associate professor in the Image Sciences Institute (ISI) of Utrecht University since 1989. He received a M.S. in Applied Physics from Delft University of Technology in 1978 and his Ph.D. from Utrecht University in 1983. He then became the principal physicist of the Utrecht University Hospital Radiology Department and (1986-1989) clinical project leader of the Dutch PACS project. He has been supervising a number of PhD students and undergraduate students and heads the multiscale image analysis research at ISI since 1989.

His interests are medical image analysis, its foundations and clinical applications. In order to understand image structure and anlysis, a close look is taken to the human visual system. His interests are in particular the mathematical modeling of front-end vision, linear and non-linear scale-space theory, medical computer vision applications, picture archiving and communication systems, differential geometry and visual perception. He authored several papers and bookchapters on these issues, edited a recent book on non-linear diffusion theory in Computer Vision and is involved in (resp. initiated) a number of international collaborations on these subjects.

Bram van Ginneken Afiliation : Image Sciences Institute, University Hospital Utrecht Address: Heidelberglaan 100, AZU-room E01.334, 3584 CX Utrecht, The Netherlands Phone: +31 30 250 8353 Fax: +31 30 251 3399 E-mail: bram@isi.uu.nl Research area : Computer Vision Period of visit : July and August 1998

Bram van Ginneken studied Physics at the Eindhoven University of Technology and at Utrecht University. He graduated in 1995 on a reflection model for rough materials at the Helmholtz Institute where he continued to work on reflection properties and textural appearance of materials until november 1996. Since then he is a Ph.D. student at the ISI working on a project entitled Computer assisted thorax screening, a collaboration between the ISI and Oldelft, a manufacturer of x-ray equipment, funded by the Dutch Ministry of Economic Affairs.

Davi Geiger Afiliation : New York University, Department of Computer Science , Courant Institute of Mathematical Sciences Address: Warren Weaver Hall, 251 Mercer Street, New York, EUA Phone: +212 998-3235 Fax: +212 995-4124 E-mail: geiger@cs.nyu.edu Research area : Computer Vision Period of visit : July and August 1998

Professor Davi Geiger is a visiting assistant professor at the Courant Institute, New York University. He received the Ph.D. from MIT in Physics working also at the Artificial Intelligence Laboratory. Dr. Geiger has held a visiting position at the Isaac Newton Institute for Mathematics and Applications, in Cambridge, England. Dr. Geiger has also worked in Medical Imaging at Siemens Corporate Research, NJ.

Dr. Geiger's research interest are in computer vision as a visual information science and its applications. In particular, he has been interested on using statistical and robust techniques to detect reliable features for recognition schemes. He has been interested on techniques, methods, and models capable of efficiently combining local features with global ones from a Bayesian framework, e.g. dynamic programming for hidden Markov models and generalizations for Markov random fields. He has succesfully applied these methods on medical and biochemistry imaging, for the detection and analysis (i) of the evolution of the heart, from MRI images (now a product of the Siemens MRI machines) and (ii) of the DNA molecules from miscroscopic imaging (now being used for the GENOME project at the W. M. Keck Laboratory for Biomolecular Imaging, Dept. of Chemistry, NYU.)

Dr. Geiger was the keynote speaker of the 1993, 10th Israeli Symposium on Aritificial Intelligence, Computer Vision and Neural Neworks, and invited speaker on the 1992 SIAM Conference on Linear Algebra and its Applications.

Antonio Elias Fabris Afiliation : University of São Paulo, Department of Applied Mathematics Address: Rua do Matão 1010; CEP 05508-900; São Paulo - SP; Brazil Phone: +55/11/818-6136 Fax: +55/11/818-6131 E-mail: aef@ime.usp.br Research area : Computer Graphics, Applied Computational Geometry, Image Processing Period of visit : Jan to Feb 1998

Antonio Elias Fabris graduated in Applied Mathematics from the Institute of Mathematics and Statistics (IME) at the University of São Paulo, Brazil, where he has been a lecturer since 1986. He received his Ph.D. in Computer Graphics ("Robust Antialiasing of Curves") from the University of East Anglia. He is also the coordinator of the Computer Graphics and Applied Computational Geometry Project (CGCAP) at IME-USP.

His current research interests include sampling, filtering and antialiasing; consistency and robustness of geometric computation in Applied Computational Geometry; Visual Simulation of Natural Phenomena; and the relationship between Computer Graphics and Image Processing for rendering.

Thomas de Araujo Buck Afiliation :Universidade Federal da Bahia,Departamento de Ciencia da Computação Address: Av. Ademar de Barros s/n, Ondina, 40170-110 Salvador BA, Brasil Phone: (071) 247-3405 Fax: (071) 245-7436 E-mail: thomas@ufba.br Research area : Computer Vision Period of visit : July and August 1998

Thomas de Araujo Buck graduated in Mechanical Engineering at the Escola Politécnica of the Universidade Federal da Bahia (1986), and got the Master in Electrical Engineering at the Faculdade de Engenharia Elétrica of the Universidade Estadual de Campinas (1989), both in Brasil.

Thereafter, in July 1995, he got his PhD at the Fakultät für Informatik at the Universität Tübingen , Germany, with the title "Interactive Interpretation of Volume Data". Since August 1995 he is Collaborating Professor at the Departamento de Ciencia da Computação at the Instituto de Matemática of the Universidade Federal da Bahia, in Salvador BA.

He is interested in Visual Computing (Computer Graphics, Image Processing, Computer Vision and Geometric Modeling), Artificial Intelligence and Applications in the Biomedical Sciences.