Relighting Photographs of Tree Canopies

Marcio Cabral 1 Nicolas Bonneel 2 Sylvain Lefebvre 1 George Drettakis 1
1 REVES - Rendering and virtual environments with sound
CRISAM - Inria Sophia Antipolis - Méditerranée
2 UBC-Computer Science - Computer Science Department
Abstract : We present an image-based approach to relighting photographs of tree canopies. Our goal is to minimize capture overhead; thus the only input required is a set of photographs of the tree taken at a single time of day, while allowing relighting at any other time. We first analyze lighting in a tree canopy both theoretically and using simulations. From this analysis, we observe that tree canopy lighting is similar to volumetric illumination. We assume a single-scattering volumetric lighting model for tree canopies, and diffuse leaf reflectance; we validate our assumptions with synthetic renderings. We create a volumetric representation of the tree from 10-12 images taken at a single time of day and and use a single-scattering participating media lighting model. An analytical sun and sky illumination model provides consistent representation of lighting for the captured input and unknown target times. We relight the input image by applying a ratio of the target and input time lighting representations. We compute this representation efficiently by simultaneously coding transmittance from the sky and to the eye in spherical harmonics. We validate our method by relighting images of synthetic trees and comparing to path-traced solutions. We also present results for photographs where sparse, validating with time-lapse ground truth sequences.
keyword : Image based rendering relighting
Type de document :
Article dans une revue
IEEE Transactions on Visualization and Computer Graphics, Institute of Electrical and Electronics Engineers, 2011, 〈10.1109/TVCG.2010.236〉
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https://hal.inria.fr/inria-00607042
Contributeur : Team Reves <>
Soumis le : jeudi 7 juillet 2011 - 17:04:33
Dernière modification le : samedi 27 janvier 2018 - 01:31:22
Document(s) archivé(s) le : samedi 8 octobre 2011 - 02:40:09

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Marcio Cabral, Nicolas Bonneel, Sylvain Lefebvre, George Drettakis. Relighting Photographs of Tree Canopies. IEEE Transactions on Visualization and Computer Graphics, Institute of Electrical and Electronics Engineers, 2011, 〈10.1109/TVCG.2010.236〉. 〈inria-00607042〉

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