Vitor Pamplona

Innovation on Vision: Imaging , Enhancement and Simulation

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.

Source Code

Source code containing all PLR and latency models described in the literature is available under GPL here. Feel free to use, integrate and change the code in any non-commercial application.  

References

  • Photorealistic models for pupil light reflex and iridal pattern deformation
    Vitor F. Pamplona, Manuel M. Oliveira, Gladimir V. G. Baranoski
    ACM Transactions on Graphics (TOG). 28, 4, pp. 106:1 - 106:12, Aug. 2009.
    http://doi.acm.org/10.1145/1559755.1559763
     PDF        Video

  • Photorealistic models for pupil light reflex and iridal pattern deformation
    Vitor F. Pamplona
    Master's thesis. Porto Alegre: PPGC-UFRGS, Apr. 2008.
     PDF        Video        Presentation

  • Modelos Foto-realistas para o Reflexo Pupilar à Luz e Deformação dos Padrões da Íris
    Vitor F. Pamplona, Manuel M. Oliveira, Gladimir V. G. Baranoski
    Proc. of XXIX Brazilian Computer Society Congress (BCSC 2009) . Porto Alegre: SBC, 2009.
     PDF        Video        Presentation

  • Estudo sobre a íris humana para síntese de imagens foto-realísticas
    Vitor F. Pamplona
    Tech Report
    n. 1284 . Porto Alegre: PPGC-UFRGS, Ago. 2007.
     PDF
    (only in portuguese)

BibTex

@article{Pamplona2009,
author = {Vitor F. Pamplona and Manuel M. Oliveira and Gladimir V. G. Baranoski},
title = {Photorealistic models for pupil light reflex and iridal pattern deformation},
journal = {ACM Trans. Graph.},
volume = {28},
number = {4},
year = {2009},
issn = {0730-0301},
pages = {106:1--106:12},
doi = {http://doi.acm.org/10.1145/1559755.1559763},
publisher = {ACM},
address = {New York, NY, USA},
url = {\url{http://vitorpamplona.com/deps/papers/2009_TOG_IRIS.pdf}}, 
}

@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},
  url = {\url{http://vitorpamplona.com/deps/papers/2009_UFRGS_DISS.pdf}}, 
}
@InProceedings{Pamplona2009b,
author = {Vitor F. Pamplona and Manuel M. Oliveira and Gladimir V. G. Baranoski},
title = {Modelos Foto-realistas para o Reflexo Pupilar à Luz e Deformação dos Padrões da Íris},
booktitle = {Proc. of XXIX Brazilian Computer Society Congress (BCSC 2009)},
year = {2009},
address = {Porto Alegre: SBC},
  url = {\url{http://vitorpamplona.com/deps/papers/2009_CTD_IRIS.pdf}}, 
}
@TECHREPORT{Pamplona2007,
author = {Vitor F. Pamplona},
title = {Estudo sobre a íris humana para síntese de imagens foto-realísticas},
institution = {Universidade Federal do Rio Grande do Sul. Instituto de Informática},
year = {2007},
type = {Trabalho Individual},
number = {1284},
address = {Porto Alegre: PPGC-UFRGS},
}

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Posted in Mar 21, 2011 by Vitor Pamplona - Edit - History

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