Tutorial 6: Simulation of light interaction with human skin
Tuesday, August 30th, 2005. 08:30 - 12:30 (Half Day)
VENUE: Emmet Theatre.
| ORGANISER: |
Gladimir Baranoski, University of Waterloo
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| SPEAKERS: |
Gladimir Baranoski (U. of Waterloo)
Aravind Krishnaswamy (U. of Waterloo) |
Outline and Syllabus
Despite the notable progress in rendering, there is still
a long way to go before one can automatically generate predictable images of
biological materials. This tutorial addresses an important topic
in this area, namely the predictive simulation of skin's appearance. The
modeling approaches, algorithms and data examined during this
tutorial can be also applied to the rendering of other organic
materials such as muscles, hair, fur and eyes.
The tutorial begins with a review of optics and appearance
concepts used in the design and validation of models of
light interaction with organic matter, followed by a presentation of
biological factors involved in the processes of light propagation
and absorption in skin tissues. These phenomena not only affect
skin's appearance, but also its health. Accordingly, there is
a considerable amount of research on skin optics available in the biomedical literature. However,
the models developed in this field are mostly aimed at the reproduction of skin spectral properties to determine the content and distribution
of various substances, i.e., scattering properties affecting
skin's appearance are usually not addressed. In computer graphics,
on the other hand, the focus has been on the development
of scattering models for image synthesis
frameworks. Nevertheless, these models incorporate algorithms
and techniques used in the biomedical field, and recent research
efforts are directed toward the
development of comprehensive simulation algorithms that
take as input biological data and compute
both spectral and scattering properties for skin tissues.
Taking into account these aspects, this tutorial
provides a review of relevant modeling approaches used
in biomedical applications followed by a detailed
examination of models of light interaction with human skin
available in the graphics literature. The
tutorial will conclude with a discussion of
open problems and current trends in the predictive
rendering of human skin.
- Module I - Biophysical Background
- Introduction - Baranoski (5 min)
- Light, Optics and Appearance - Krishnaswamy (35 min)
- Biological Issues - Krishnaswamy (25 min)
- Review of Models used in Biomedical Applications - Baranoski (40 min)
- Module II - Computer Graphics Modeling
- The Multilayer Scattering Model (Hanrahan and Krueger, 1993) - Baranoski (25 min)
- The Discrete-Ordinate Model (Stam, 2001) - Baranoski (20 min)
- The Diffusion Theory Based Model (Jensen et al. 2001) - Krishnaswamy (20 min)
- The BioSpec Model (Krishnaswamy and Baranoski, 2004) - Krishnaswamy (25 min)
- What's next? - Baranoski (10 min)
- Conclusion - Baranoski (5 min)
- Panel Discussion - Baranoski and Krishnaswamy (variable)
Presenters’ Background
Gladimir Baranoski received a Ph.D. in Computer Science from the University of Calgary in 1998.
Currently, he is a faculty member at the School of Computer Science and the leader of the Natural
Phenomena Simulation Group at the University of Waterloo. The results of his research on
biophysically-based rendering have been made available to the graphics community through the publication
of articles in journals and conference proceedings. He has also organized tutorial presentations
for conferences (CGI 2000, EUROGRAPHICS (2001 and 2002) and SIGGRAPH (2002 and
2003)), and he has recently authored a book on topics related to his research.
Aravind Krishnaswamy is senior software architect at Inscriber Technology Corporation where he
has been since 1999. During this time, he has led the IncaStudio team whose main activities involve
the research and development of 3D technology for broadcast television. He is also a candidate for
a MMath in Computer Science and a member of the Natural Phenomena Simulation Group at the
University of Waterloo. His current research involves the simulation of light interaction with human
skin. Recently, he has co-authored several papers related to his research, and he has also co-presented
an introductory tutorial on this topic at SIBGRAPI’2004.
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