Vitor Pamplona

Innovation on Vision: Imaging , Enhancement and Simulation

History of Photorealistic Models for Pupil Light Reflex and Iridal Pattern Deformation

We introduce a physiologically-based model for pupil light reflex (PLR) and an image-based model for iridal pattern deformation. Our PLR model expresses the pupil diameter as a function of the environment lighting, and is described by a delay-differential equation, naturally adapting the pupil diameter even to abrupt changes in light conditions. Since the parameters of our PLR model were derived from measured data, it correctly simulates the actual behavior of the human pupil. Another contribution of our work is a model for realist deformation of the iris pattern as a function of pupil dilation and constriction. Our models produce high-fidelity appearance effects and can be used to produce real-time predictive animations of the pupil and iris under variable lighting conditions. We assess the predictability and quality of our simulations through comparisons of modeled results against measured data derived from experiments also described in this work. Combined, our models can bring facial animation to new photorealistic standards.

References

Vitor F. Pamplona, Manuel M. Oliveira and Gladimir V. G. Baranoski. Photorealistic models for pupil light reflex and iridal pattern deformation . ACM Transactions on Graphics. [To Appear], 2009. [ PDF,  Video]

Vitor F. Pamplona. Photorealistic models for pupil light reflex and iridal pattern deformation . Master's thesis. Porto Alegre: CPGCC-UFRGS, Apr. 2008. [ PDF,    Video (Portuguese only)]

Vitor F. Pamplona. Estudo sobre a íris humana para síntese de imagens foto-realísticas . TechReport n. 1284. Porto Alegre: CPGCC-UFRGS, Ago. 2007. [  PDF] (Portuguese only)

BibTex

@ARTICLE{Pamplona2009,
author = {Vitor F. Pamplona, Manuel M. Oliveira and Gladimir V. G. Baranoski},
title = {Photorealistic Models for Pupil Light Reflex and Iridal Pattern Deformation},
journal = {ACM Transactions on Graphics},
year = {2009},
volume = {[To Appear]},
pages = {18},
}

@MASTERSTHESIS{Pamplona2008a,
author = {Vitor F. Pamplona},
title = {Photorealistic Models for Pupil Light Reflex and Iridal Pattern Deformation},
school = {Universidade Federal do Rio Grande do Sul {(UFRGS)}},
year = {2008},
address = {Porto Alegre, Brazil},
month = {April},
}

@TECHREPORT{Pamplona2007,
author = {Vitor F. Pamplona},
title = {Estudo sobre a íris humana para síntese de imagens fotorealísticas},
institution = {Universidade Federal do Rio Grande do Sul. Instituto de Informática},
year = {2007},
type = {Trabalho Individual},
number = {1284},
address = {Porto Alegre},
}

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Posted in Jul 8, 2009 by Vitor Pamplona - Edit History - History

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