Mission

The Peripheral Systems Lab aims at creating and exploring new paradigms in fields related to color imaging and media servers. The main focus of our research is directed towards novel imaging techniques such as spectral color prediction models, color reproduction, moiré phenomena and artistic imaging. We have also created a new approach for exploring human anatomy (Visible Human) and have developed a fault-tolerant framework for creating non-trivial parallel programs running on clusters of PCs.

Biography

Roger D. Hersch is professor of Computer Science and head of the Peripheral Systems Laboratory at EPFL. He received his engineering degree from ETHZ in 1975, worked in industry from 1975 to 1980, and obtained his PhD degree from EPFL in 1985. He directed the widely known Visible Human Web Server project, which offers a number of services for the visualization of human anatomy.


His current research focuses on color reproduction, spectral color prediction models, moiré imaging, and visual document security. Recent achievements include the PhotoProtect technology, which incorporates text as chromatic differences in order to protect identity photographs (Swiss driving license), microstructure imaging, which is used by railways companies (SNCF, RENFE) and festival organizers (Paleo) to print tickets at home and the band moire imaging technology for the protection of security documents.

MAIN PUBLICATIONS

R. D. Hersch. Spectral prediction model for color prints on paper with fluorescent additives, Applied Optics, Vol. 47, No. 26, 6710-6722, 2008.
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Color images visible under UV light,
R.D. Hersch, P. Donzé, S. Chosson, Proc. SIGGRAPH 2007, ACM Trans. on Graphics, Vol. 26, No.3, Article 75 , 10 pages
Details

Reflectance and transmittance model for recto-verso halftone prints
M. Hébert, R.D. Hersch
J. Opt. Soc. Am. A, Vol. 23, No. 10, October 2006, pp. 2415-2432
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Distance preserving flattening of surface sections
L. Saroul, O. Figueiredo and R.D. Hersch
IEEE Transactions on Visualization and Computer Graphics, 12 (2006) 26-35
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Spectral reflection and dot surface prediction models for color halftone prints
R.D. Hersch, P. Emmel, F. Collaud, F. Crété
Journal of Electronic Imaging, Vol. 14, No. 3, August 2005, pp. 33001-12
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Improving the Yule-Nielsen modified spectral Neugebauer model by dot surface coverages depending on the ink superposition conditions
R.D. Hersch, F. Crété
IS&T/SPIE Electronic Imaging Symposium, Conf. Imaging X: Processing, Hardcopy and Applications, Jan. 05, SPIE Vol. 5667, 434-445
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Band Moiré Images
R.D. Hersch, S. Chosson
Proc. SIGGRAPH 2004, ACM Trans. on Graphics, Vol. 23, No.3, 239-248
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Protecting identity documents by microstructure color differences
N. Rudaz, R.D. Hersch,
Journal of Electronic Imaging, Vol. 1, No. 2, April 2004, 315-323
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Reproducing color images with embedded metallic patterns
R.D. Hersch, F. Collaud, P. Emmel
Proc. SIGGRAPH 2003, ACM Trans. on Graphics, Vol. 22, No.3, 427-436
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DPS - Dynamic Parallel Schedules
S. Gerlach, R.D. Hersch
Proc. of 8th Int'l Workshop on High-Level Parallel Programming Models and Supportive Environments (HIPS 2003), 17th International Parallel and Distributed Processing Symposium (IPDPS), April 22-26, Nice, France, 2003, IEEE Press, 15-24
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Parameterizable Fonts Based on Shape Components
C. Hu, R.D. Hersch
IEEE Computer Graphics and Applications, Vol. 21, No. 3, May/June 2001, 70-85
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Perceptually-Tuned Generation of Grayscale Fonts
R.D. Hersch, J. Bur, C. Betrisey, A. Guertler
IEEE Computer Graphics and Applications, Vol. 15, No. 6, Nov. 1995, 78-89
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Main patents

Ink thickness variations for the control of color printers
US Pat. 7,252,360, inventors R.D. Hersch, P. Amrhyn, M. Riepenhoff, issued Aug. 7, 2007
[Full text]

Authentication of documents and articles by moire patterns
US Pat. 7,194,105, inventors R.D. Hersch; S. Chosson, issued March 20, 2007
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Images incorporating microstructures
US Pat. 7,027,660, inventors R.D.Hersch, B. Wittwer, E. Forler, P. Emmel, D. Biemann, D. Gorostidi, D. Bongard, issued April 11, 2006
[ Full text]

Authentication of documents and valuable particles by using moire intensity profiles
US Pat. 6,819,775, inventors I.Amidror, R.D.Hersch, issued Nov. 16, 2004
[ Full text]

Current work

Fluorescent images
Advanced spectral prediction models
Control of printing presses

Roger Hersch's research is sponsored by the Swiss National Science Foundation, the Swiss Federal Commission for Technology Innovation (CTI), the Hasler Foundation, and from revenues of licensing agreements.