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Issue No.08 - August (2011 vol.17)

pp: 1108-1121

Anthony Pajot , IRIT, Université Paul Sabatier IRIT-CNRS, Toulouse

Loïc Barthe , IRIT, Université Paul Sabatier IRIT-CNRS, Toulouse

Mathias Paulin , IRIT, Université Paul Sabatier IRIT-CNRS, Toulouse

Pierre Poulin , Universite de Montreal, Montreal

DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TVCG.2010.230

ABSTRACT

We present a general method enhancing the robustness of estimators based on multiple importance sampling (MIS) in a numerical integration context. MIS minimizes variance of estimators for a given sampling configuration, but when this configuration is less adapted to the integrand, the resulting estimator suffers from extra variance. We address this issue by introducing the notion of "representativity” of a sampling strategy, and demonstrate how it can be used to increase robustness of estimators, by adapting them to the integrand. We first show how to compute representativities using common rendering informations such as BSDF, photon maps, or caches in order to choose the best sampling strategy for MIS. We then give hints to generalize our method to any integration problem and demonstrate that it can be used successfully to enhance robustness in different common rendering algorithms.

INDEX TERMS

Monte-Carlo, three-dimensional graphics and realism.

CITATION

Anthony Pajot, Loïc Barthe, Mathias Paulin, Pierre Poulin, "Representativity for Robust and Adaptive Multiple Importance Sampling",

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