KIAM Main page Web Library  •  Publication Searh   
Publication

KIAM Preprint  107, Moscow, 2020
Authors: Ershov S.V., Birukov .D., Voloboy A.G.
Efficient Calculation of the Optimal MIS Weights in Bidirectional Ray Tracing with Photon Maps
Abstract:
Bidirectional stochastic ray tracing (in particular, with photon maps) is well known technique for realistic computer graphics. However, its results are noisy, like all stochastic methods, which is clearly visible in the image. An approach called Multiple Importance Sampling can significantly reduce noise with the optimal weights used in it. In the paper we solved the partial optimization problem for mixing two strategies determined by the number of diffuse scattering events of the camera ray. Optimal weights that minimize noise obey an integral equation which can be solved in a closed form, and we present a numerical method to calculate its terms. It is based on Monte Carlo integration and stochastic ray tracing. The weights obtained in this way lead to noise reduction. The analysis of results for the test scene is presented.
Keywords:
stochastic ray tracing, denoising, multiple importance sampling, optimal weights
Publication language: russian,  pages: 22
Research direction:
Mathematical modelling in actual problems of science and technics
Russian source text:
Export link to publication in format:   RIS    BibTeX
View statistics (updated once a day)
over the last 30 days 4 (-5), total hit from 21.12.2020 122
About authors:
  • Ershov Sergey Valentinovich,  orcid.org/0000-0002-5493-1076KIAM RAS
  • Birukov lissey Dmitrievich,  orcid.org/0000-0003-4297-6813KIAM RAS
  • Voloboy Alexey Gennadievich,  orcid.org/0000-0003-1252-8294KIAM RAS