Master projects 2011-2012
Some of the projects can be carried out in collaboration with industry or
with another university (grants available). On request, additional
projects of collaboration with industry can be made available.
Please consult the responsible assistant or/and Prof. R.D. Hersch before registering at
your section as well as at our secretary (Mrs Maria Anitua).
COLOR REPRODUCTION & IMAGING
- Microcomputer LED based sensing system
- Model-based color separation for custom inks (possible industry collaboration)
- Analysis of optical and physical dot gain by microscopic imaging methods
DOCUMENT SECURITY
- Nouvelles méthodes de protection contre la contrefaçon (collaboration avec industrie)
For more information on EPFL's basic spectral prediction model, consult the paper
Spectral prediction and dot surface estimation models for halftone prints .
In order to be able to print correct colors, future printers will incorporate
non-expensive color measuring devices. LEDs have the capability of both emitting light and
sensing light within a given range of wavelengths. Create a LED based measurement system,
by interfacing one or several LEDs to a microcomputer. Conceive an appropriate
setup for calibrating this measurement system. The microcomputer, the LEDS and an optical
bench comprising various light sources and a spectrophotometer are available.
- Responsables:
- Romain Rossier, tél. 36744 (r.rossier@epfl.ch)
- Roger D. Hersch, tél. 34357 (RD.Hersch@epfl.)
The Peripheral Systems Lab of EPFL has developed a model for predicting the color of printed patches.
Enhance that model to compute the color separation for custom inks, by introducing additional
constraints. Experiences can be carried out on a 9 color ink-jet printer, as well as on commercial offset proofing
machines (http://www.images3.ch/).
- Responsables:
- Romain Rossier, tél. 36744 (r.rossier@epfl.ch)
- Roger D. Hersch, tél. 34357 (RD.Hersch@epfl.)
Monte-Carlo simulation of the interaction between light, substrate and inks (collaboration with
Université de St-Etienne)
Various phenomena influence the reflection spectrum of a color halftone
patch printed on a given substrate (e.g. paper). These phenomena comprise
the surface (Fresnel) reflection at the interface between the air and the paper, light
scattering and reflection within the substrate (i.e. the paper bulk), and the internal (Fresnel)
reflections at the interface between the paper and the air.
We would like to deduce the reflectance of halftone prints (BRDF) according to the observation angle
by performing a Monte-Carlo simulation, i.e. by launching many light rays
across a parametrisable model of the print.
- Responsables:
- Roger D. Hersch, tél. 34357 (RD.Hersch@epfl.)
The spectral prediction models developed at our laboratory
(ink-spreading enhanced Yule-Nielsen modified spectral Neugebauer) allow predicting
the physical and optical dot gain present in halftone prints. Verify if the same values can
be obtained by macroscopic and microscopic imaging techniques. Available aquisition devices are
a 2400 dpi scanner, a Proscope imaging microscope and an olympus microscope connected to a camera.
- Responsables:
- Roger D. Hersch, tél. 34357 (RD.Hersch@epfl.)
Nous développons de nouvelles méthodes pour sécuriser des documents de valeur
(cartes de crédit, chèques, billets de banque, etc..).
Des projets peuvent être proposés dans les domaines suivants:
rendu d'images par microstructures couleur cachées,
nouveaux effets de moiré, effets stéréo.
Veuillez contacter directement le professeur R.D. Hersch.
- Responsables:
- Roger D. Hersch, tél. 34357 (RD.Hersch@epfl.)
<basile.schaeli@epfl(add: .ch)>
