Hans du Buf

Keywords: visual perception, modeling, image processing, pattern recognition, computer graphics, parallel processing

Brief CV:

I started at the HTS Venlo (The Netherlands), a sort of polytechnic, in electrical engineering. See nostalgia (in Dutch). Then I did my Masters at the Techical University of Eindhoven in 1983. I obtained my PhD, working at the Institute for Perception Research (IPO), from the same University in 1987. I worked for 7 years at the Swiss Federal Institute of Technology in Lausanne (EPFL) before moving to the University of the Algarve in Faro, Portugal, in March 1994. Now I am associate professor; my teaching includes digital systems, computer architecture, computer graphics as well as image processing (the latter two courses also at the Masters' level).

My PhD was on visual psychophysics, more specifically on the perception of brightness and contrast for spatial patterns, and the modeling of visual perception. This work still continues by studies concerning the role of Gabor phase information for an accurate detection of lines and edges in images, now also the detection of isolated bars and periodic gratings, in the development of advanced visual models with applications in pattern recognition. I also work on texture feature extraction and segmentation. I was the first to publish practical algorithms for 2D phase unwrapping (Signal Processing Vol 21, 1990, pp 221-240).

New research lines include optical sectioning microscopy, triangle-mesh smoothing and reduction, direct volume rendering, diatom identification as well as tools for parallel computing on Beowulf clusters. If you scan the publications you'll see that painterly rendering, i.e. translating photographs into paintings using models of perception, is the most recent activity. This hopefully results in research concerning colour emotions, image abstraction and visual aesthetics.

I was the coordinator of the European diatom project ADIAC. The final scientific report: Automatic Diatom Identification, H du Buf and MM Bayer (eds), World Scientific, Series in Machine Perception and Artificial Intelligence, Vol. 51, 2002. DETAILS.

I am Associate Editor of the Int J of Pattern Recognition and Artificial Intelligence: IJPRAI.

I am a member of the ISR - Institute for Systems and Robotics at the Tecnico in Lisbon, the IEEE Computer Society, as well as the Portuguese Association for Pattern Recognition APRP and the International Association for Pattern Recognition IAPR

You can get my complete CV in html (needs a lot of updating)

For a brief description of the Vision Lab (people, equipment, projects), click HERE.
You can also go directly to the project pages:
SmartVision - Active vision for the blind
MOVIDE - Modeling visual detection
EXOCET/D - Extreme ecosystems in the deep ocean
ISACS - 3D Sonar data of the seafloor
ADIAC - Diatom identification
AMOVIP - Visual information processing
SPMDlib - Parallel image processing
IP-over-SCSI - Alternative interconnects
3D modeling from video
New student projects may concern AMD 3DNow! and Sony PS2 vectorisation
See Linux PS2 cluster
PlayStation2 running Linux - read ps2.txt
Beowulf cluster at UALG: see CALHAU
As you see, a lot of old stuff. We're now having two NVIDIA TESLA boards, each with 240 cores, and NVIDIA just announced the new generation with 512 cores!

Appeared in 2002: Automatic diatom identification, Hans du Buf and Micha M. Bayer (eds), World Scientific, only US$72 (all you wanted to know about diatom identification but never dared to ask). DETAILS.

A few recent journal papers and book chapters:

1. van Deemter, JH and du Buf, JMH (2001) Line and edge detection by curvature- adaptive neural networks. Chapter 10 in: Plausible neural networks for biological modelling, HAK Mastebroek and JE Vos (Eds), Kluwer Academic, pp219-239.
2. du Buf, J.M.H. (2001) Modeling brightness perception. Chapter 2 in: Vision models and applications to image and video processing, C.J. van den Branden Lambrecht (ed.), Kluwer Academic, pp 21-36.
3. Loke, du Buf, Bayer and Mann (2004) Diatom classification in ecological applications. Pattern Recognition 37, pp 1283-1285.
4. Loke, R.E. and du Buf, J.M.H. (2004) Quadtree-guided 3D interpolation of irregular sonar data sets. IEEE J. of Oceanic Engineering 29/2, pp 457-471.
5. du Buf, J.M.H., Rodrigues, J., Nunes, S., Almeida, D., Brito, V., Carvalho, J. (2006) Painterly rendering using human vision. To appear in: VIRTUAL, Advances in Computer Graphics AICG06, pp. 12. http://virtual.inesc.pt
6. Rodrigues, J. and du Buf, J.M.H. (2006) Multi-scale keypoints in V1 and beyond: object segregation, scale selection, saliency maps and face detection. BioSystems (Elsevier) doi:10.1016/j.biosystems.2006.02.019
7. du Buf, J.M.H. (2006) Improved grating and bar cell models in cortical area V1 and texture coding. Image and Vision Computing (Elsevier) doi:10.1016/j.imavis.2006.06.005

New conference and workshop papers (2006):

1. Lam, R., Rodrigues, J. and du Buf, J. (2006) Looking through the eyes of the painter: from visual perception to non-photorealistic rendering. Proc. 14th Int. Conf. Computer Graphics, Visualization and Computer Vision (WSCG 2006), Plzen, Czech Republic, pp. 147-154. http://wscg.zcu.cz/wscg2006/wscg2006.htm
2. Loke, R.E., Jansen, F.W. and du Buf, J. (2006) A background-priority discrete boundary triangulation method. Proc. 14th Int. Conf. Computer Graphics, Visualization and Computer Vision (WSCG 2006), Plzen, Czech Republic, pp. 61-68. http://wscg.zcu.cz/wscg2006/wscg2006.htm
3. Rodrigues, J. and du Buf, J.M.H. (2006) Cortical object segregation and categorization by multi-scale line and edge coding. Proc. Int. Conf. Computer Vision, Theory and Applications (VISAPP2006), Setubal, Portugal, Feb. 25-28, Vol. 2, pp. 5-12.
4. Rodrigues, J. and du Buf, J.M.H. (2006) Face segregation and recognition by cortical multi-scale line and edge coding. Proc. 6th Int. Worksh. Pattern Recogn. in Information Systems (PRIS2006), Paphos, Cyprus, May 23-24, pp. 5-14.
5. Rodrigues, J. and du Buf, J.M.H. (2006) Face recognition by cortical multi-scale line and edge representations. Proc. Int. Conf. Image Analysis and Recognition (ICIAR2006), Povoa do Varzim, Portugal, 18-20 Sept., Springer LNCS 4142, pp. 329-340.
6. Nunes, S., Almeida, D., Brito, V., Carvalho, J., Rodrigues, J., du Buf, J.M.H. (2006) Perception-based painterly rendering: functionality and interface design. Proc. 3rd Ibero-American Symp. Computer Graphics (SIACG), Santiago de Compostela, Spain, July 5-7, P. Brunet et al. (eds), the Eurographics Association, pp. 53-60.

You can see my complete, updated PUBLICATION LIST

Address etc:

Prof.dr.ir. J.M.H. du Buf Dept. of Electronics and Computer Science - FCT, University of Algarve, Campus de Gambelas, 8000 Faro, Portugal Email: dubuf@ualg.pt Tel: (+351) 289 800900 extension 7761 Fax: (+351) 289 818560

This page has been visited times since August 15, 1997.