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An Error Bound for Decoupled Visibility with Application to Relighting

Schwenk, Karsten and Behr, Johannes and Fellner, Dieter W. (2011):
An Error Bound for Decoupled Visibility with Application to Relighting.
Eurographics Association, In: Eurographics 2011. Short Papers, pp. 25-28, [Conference or Workshop Item]

Abstract

Monte Carlo estimation of direct lighting is often dominated by visibility queries. If an error is tolerable, the calculations can be sped up by using a simple scalar occlusion factor per light source to attenuate radiance, thus decoupling the expensive estimation of visibility from the comparatively cheap sampling of unshadowed radiance and BRDF. In this paper we analyze the error associated with this approximation and derive an upper bound. We demonstrate in a simple relighting application how our result can be used to reduce noise by introducing a controlled error if a reliable estimate of the visibility is already available.

Item Type: Conference or Workshop Item
Erschienen: 2011
Creators: Schwenk, Karsten and Behr, Johannes and Fellner, Dieter W.
Title: An Error Bound for Decoupled Visibility with Application to Relighting
Language: English
Abstract:

Monte Carlo estimation of direct lighting is often dominated by visibility queries. If an error is tolerable, the calculations can be sped up by using a simple scalar occlusion factor per light source to attenuate radiance, thus decoupling the expensive estimation of visibility from the comparatively cheap sampling of unshadowed radiance and BRDF. In this paper we analyze the error associated with this approximation and derive an upper bound. We demonstrate in a simple relighting application how our result can be used to reduce noise by introducing a controlled error if a reliable estimate of the visibility is already available.

Publisher: Eurographics Association
Uncontrolled Keywords: Forschungsgruppe Semantic Models, Immersive Systems (SMIS), Business Field: Virtual engineering, Research Area: Confluence of graphics and vision, 3D Computer graphics, Photorealistic rendering, Lighting
Divisions: 20 Department of Computer Science
20 Department of Computer Science > Interactive Graphics Systems
Event Title: Eurographics 2011. Short Papers
Date Deposited: 12 Nov 2018 11:16
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