Dependent Tests Driven Filtering in Monte-Carlo Global Illumination

Csonka, Ferenc; Szirmay-Kalos, Laszlo; Kelemen, Csaba; Antal, György

Dependent Tests Driven Filtering in Monte-Carlo Global Illumination

Files

short9.pdf (795.9 KB)

Date

2002

Authors

Csonka, Ferenc
Szirmay-Kalos, Laszlo
Kelemen, Csaba
Antal, György

Publisher

Eurographics Association

Abstract

This paper presents a multi-phase algorithm to solve the global illumination problem. In the first phase dependent tests are applied, i.e. the random walks of different pixels are built from the same random numbers. The result of the first phase is used to identify homogeneous pixel groups in the image. The criterion of the formation of such groups is that averaging the color inside these groups should result in less error than handling the pixels independently. The second phase of the algorithm is a conventional random walk method that uses independent random samples in different pixels. The final result is calculated as the average of the results of the dependent tests and the lowpass filtered version of the independent tests. This low-pass filter averages the pixel values inside the homogenous groups. The algorithm takes advantage of the fact that the image can contain larger homogeneous regions that can be calculated from much less number of samples. Thus we can focus on those pixels where significant changes happen.

        @inproceedings{:10.2312/egs.20021043
,
booktitle = {Eurographics 2002 - Short Presentations
},
editor = {},
title = {{Dependent Tests Driven Filtering in Monte-Carlo Global Illumination
}},
author = {Csonka, Ferenc and 
Szirmay-Kalos, Laszlo and 
Kelemen, Csaba and 
Antal, György
},
year = {2002
},
publisher = {Eurographics Association
},
ISSN = {1017-4656
},
ISBN = {},
DOI = {/10.2312/egs.20021043
}
}