Diffusion Based Photon Mapping

TY - GEN

T1 - Diffusion Based Photon Mapping

AU - Schjøth, Lars

AU - Olsen, Ole Fogh

AU - Sporring, Jon

N1 - Conference code: 1

PY - 2006

Y1 - 2006

N2 - Density estimation employed in multi-pass global illumination algorithms give cause to a trade-off problem between bias and noise. The problem is seen most evident as blurring of strong illumination features. In particular this blurring erodes fine structures and sharp lines prominent in caustics. To address this problem we introduce a novel photon mapping algorithm based on nonlinear anisotropic diffusion. Our algorithm adapts according to the structure of the photon map such that smoothing occurs along edges and structures and not across. In this way we preserve the important illumination features, while eliminating noise. We call our method diffusion based photon mapping.

AB - Density estimation employed in multi-pass global illumination algorithms give cause to a trade-off problem between bias and noise. The problem is seen most evident as blurring of strong illumination features. In particular this blurring erodes fine structures and sharp lines prominent in caustics. To address this problem we introduce a novel photon mapping algorithm based on nonlinear anisotropic diffusion. Our algorithm adapts according to the structure of the photon map such that smoothing occurs along edges and structures and not across. In this way we preserve the important illumination features, while eliminating noise. We call our method diffusion based photon mapping.

M3 - Article in proceedings

SP - 168

EP - 175

BT - Proceeding of the First International conference on Computer Graphics -- Theory and Applications -- (GRAPP)

T2 - International Conference on Computer Graphics Theory and Applications

Y2 - 29 November 2010

ER -