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2010

Density-based Outlier Rejection in Monte Carlo Rendering

8 years 6 months ago
Density-based Outlier Rejection in Monte Carlo Rendering
The problem of noise in Monte-Carlo rendering arising from estimator variance is well-known and well-studied. In this work, we concentrate on identifying individual light paths as outliers that lead to significant spikes of noise and represent a challenge for existing filtering methods. Most noise-reduction methods, such as importance sampling and stratification, attempt to generate samples that are expected a priori to have lower variance, but do not take into account actual sample values. While these methods are essential to decrease overall noise, we show that filtering samples a posteriori allows for greater reduction of spiked noise. In particular, given evaluated sample values, outliers can be identified and removed. Conforming with conventions in statistics, we emphasize that the term "outlier" should not be taken as synonymous with "incorrect", but as referring to samples that distort the empirically-observed distribution of energy relative to the true unde...
Christopher DeCoro, Tim Weyrich, Szymon Rusinkiewi
Added 09 Dec 2010
Updated 09 Dec 2010
Type Journal
Year 2010
Where CGF
Authors Christopher DeCoro, Tim Weyrich, Szymon Rusinkiewicz
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