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Förslaget inkom 2004-06-18

Monte Carlo simulation of the light scattering from a network of paper fibres

OBS! ANSÖKNINGSTIDEN FÖR DETTA EXJOBB HAR LÖPT UT.
The primary function of printed paper is to visually communicate information and its quality depends on how it scatters light. Printed paper is ultimately assessed subjectively when it is seen and experienced by humans. The Visual Interfaces group at Acreo is developing a model for print quality based on the three-dimensional structure of printed paper and the sensitivity of the human visual system. Our goal is to virtually assess the quality rating of simulated printed paper samples.
Acreo¿s Grace model is a Monte-Carlo simulation program for calculating light scattering from printed paper. It describes paper as a three-dimensional structure including rough surfaces and a statistical description of the paper components such as fibres or fillers. The paper is divided in several layers such as coatings, basesheets, and print layers.
Most of the Monte-Carlo simulation part has been recently rewritten in C++ with significant speed increase as a result. The goal of this Master¿s thesis is to implement and improve a C++ version of the scattering in a network of fibres for which a first model is implemented in Matlab. The first task is thus to translate the code and adapt the code structure to the main program. Several enhancements will then be implemented and tested. The second task is to develop routines dedicated to the optimisation of the input parameters to experimental measurements.
Goal
The goal of the master¿s thesis is to implement and further develop our Monte-Carlo model for light scattering by a network of paper fibres. The work involves implementing a model previously written in Matlab into C++ and then developing some optimisation routines to fit the model parameters to experi-mental measurements.
Activities
 Project background and literature study
 Implement the standard model in C++
 Tests and proposals to improvement
 Development of optimisation routines
 Documentation and report
Time schedule
5 months. Start as soon as possible.

General information
20 points Master¿s thesis.
For this master¿s thesis we are looking for a student with good programming skills in Matlab and C++ and preferably some background in physics with interest in optics and electromagnetism.
Contact:
Ludovic.Coppel@acreo.se, Project leader
Marie-Claude.Beland@acreo.se, Group manager



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