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Paper Abstract and Keywords
Presentation 2013-03-15 10:30
Global Illumination Computation Using Replica Exchange Method Based on Locality Relaxation of Light Path Space
Hisanari Otsu, Yonghao Yue (The Univ. of Tokyo), Qiming Hou (Zhejiang Univ.), Kei Iwasaki (Wakayama Univ.), Bing-Yu Chen (National Taiwan Univ.), Yoshinori Dobashi (Hokkaido Univ.), Tomoyuki Nishita (The Univ. of Tokyo)
Abstract (in Japanese) (See Japanese page) 
(in English) Methods for computing global illumination using Markov Chain Monte Carlo techniques generate a new light path by locally mutating an already generated light path. Such methods can generate light paths carrying large energies in high probabilities, aiming at higher computation efficiency. However, using the mutation strategies proposed in previous methods, when the energy distribution of the light paths is highly localized (i.e., there are spiky peaks), the generated light paths tend to get stuck in such localized regions, thus the computation could be non-robust. To resolve this problem, we propose a new framework for global illumination computation based on a replica exchange method. In our method, we introduce a set of auxiliary path spaces whose localities are gradually relaxed, and apply a replica exchange method to this set of spaces. Using our method, we can mutate light paths through the relaxed path spaces, even if the energy distribution in the original path space is highly localized. Hence, we can robustly generate light paths over the whole path space.
Keyword (in Japanese) (See Japanese page) 
(in English) Rendering / Global illumination / Locality relaxation / Replica exchange method / / / /  
Reference Info. ITE Tech. Rep., vol. 37, no. 17, AIT2013-33, pp. 1-4, March 2013.
Paper # AIT2013-33 
Date of Issue 2013-03-08 (AIT) 
ISSN Print edition: ISSN 1342-6893
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Conference Information
Committee AIT IIEEJ AS  
Conference Date 2013-03-15 - 2013-03-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Keio Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To AIT 
Conference Code 2013-03-AIT-IIEEJ-AS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Global Illumination Computation Using Replica Exchange Method Based on Locality Relaxation of Light Path Space 
Sub Title (in English)  
Keyword(1) Rendering  
Keyword(2) Global illumination  
Keyword(3) Locality relaxation  
Keyword(4) Replica exchange method  
1st Author's Name Hisanari Otsu  
1st Author's Affiliation The University of Tokyo (The Univ. of Tokyo)
2nd Author's Name Yonghao Yue  
2nd Author's Affiliation The University of Tokyo (The Univ. of Tokyo)
3rd Author's Name Qiming Hou  
3rd Author's Affiliation Zhejiang University (Zhejiang Univ.)
4th Author's Name Kei Iwasaki  
4th Author's Affiliation Wakayama University (Wakayama Univ.)
5th Author's Name Bing-Yu Chen  
5th Author's Affiliation National Taiwan University (National Taiwan Univ.)
6th Author's Name Yoshinori Dobashi  
6th Author's Affiliation Hokkaido University (Hokkaido Univ.)
7th Author's Name Tomoyuki Nishita  
7th Author's Affiliation The University of Tokyo (The Univ. of Tokyo)
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Speaker Author-1 
Date Time 2013-03-15 10:30:00 
Presentation Time 15 minutes 
Registration for AIT 
Paper # AIT2013-33 
Volume (vol) vol.37 
Number (no) no.17 
Page pp.1-4 
Date of Issue 2013-03-08 (AIT) 

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