Fields of expertise
Color prediction models, Visual document protection, Control of color printers
MissionThe 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.
BiographyRoger 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 PUBLICATIONSR. D. Hersch. Spectral prediction model for color prints on paper with fluorescent additives, Applied Optics, Vol. 47, No. 26, 6710-6722, 2008.
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
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
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
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
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
Band Moiré Images
R.D. Hersch, S. Chosson
Proc. SIGGRAPH 2004, ACM Trans. on Graphics, Vol. 23, No.3, 239-248
Protecting identity documents by microstructure color differences
N. Rudaz, R.D. Hersch,
Journal of Electronic Imaging, Vol. 1, No. 2, April 2004, 315-323
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
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
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
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
Main patentsInk 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
Authentication of documents and articles by moire patterns
US Pat. 7,194,105, inventors R.D. Hersch; S. Chosson, issued March 20, 2007
[ Full text]
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
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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
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Current workFluorescent 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.
M. Hébert; R. Hersch : Review of spectral reflectance models for halftone prints: principles, calibration, and prediction accuracy; Color Research & Application. 2015. DOI : 10.1002/col21907.
P. Pjanic; R. Hersch : Color Imaging and Pattern Hiding on a Metallic Substrate. 2015. Proc. SIGGRAPH 2015, Los Angeles, CA, USA, August 9-13, 2015. DOI : 10.1145/2766944.
S. M. Chosson; R. D. Hersch : Beating Shapes Relying on Moire Level Lines; ACM Transactions on Graphics (TOG). 2014. DOI : 10.1145/2644806.
R. D. Hersch : Spectral prediction model for color prints on paper with fluorescent additives; Applied Optics. 2008. DOI : 10.1364/AO.47.006710.
R. D. Hersch; P. Donzé; S. Chosson : Color images visible under UV light. 2007. SIGGRAPH 2007, 2007. p. 75. DOI : 10.1145/1276377.1276471.
M. Hebert; R. D. Hersch : Reflectance and transmittance model for recto-verso halftone prints; Journal of the Optical Society of America A. 2006. DOI : 10.1364/JOSAA.23.002415.
L. Saroul; O. Figueiredo; R. D. Hersch : Distance preserving flattening of surface sections; IEEE Transactions on Visualization and Computer Graphics. 2006. DOI : 10.1109/TVCG.2006.7.
R. D. Hersch; P. Emmel; F. Collaud; F. Crete : Spectral reflection and dot surface prediction models for color halftone prints; Journal of Electronic Imaging. 2005. DOI : 10.1117/1.1989987.
R. D. Hersch; F. Crete : Improving the Yule-Nielsen modified spectral Neugebauer model by dot surface coverages depending on the ink superposition conditions. 2005. IS&T/SPIE Electronic Imaging Symposium, Conf. Color Imaging X: . p. 434-445.
R. D. Hersch; S. Chosson : Band Moire images. 2004. SIGGRAPH 2004, Los Angeles, CA, United States. p. 239-247. DOI : 10.1145/1015706.1015709.
N. Rudaz; R. Hersch : Protecting identity documents by microstructure color differences; Journal of Electronic Imaging. 2004. DOI : 10.1117/1.1687731.
R. D. Hersch; F. Collaud; P. Emmel : Reproducing color images with embedded metallic patterns. 2003. SIGGRAPH 2003, San Diego, CA, USA, July 27 - 31, 2003. p. 427-436. DOI : 10.1145/1201775.882288.
S. Gerlach; R. D. Hersch : DPS - Dynamic Parallel Schedules. 2003. Proc. of 8th Int'l Workshop on High-Level Parallel Programming Models and Supportive Environments (HIPS 2003). p. 15-24.
C. Hu; R. D. Hersch : Parameterizable fonts based on shape components; IEEE Computer Graphics and Applications. 2001.
R. D. Hersch; C. Betrisey; J. Bur; A. Gurtler : Perceptually tuned generation of grayscale fonts; IEEE Computer Graphics and Applications. 1995. DOI : 10.1109/38.469511.