Skip to Main content Skip to Navigation
New interface
Journal articles

Interactive Virtual Relighting of Real Scenes

Céline Loscos 1 George Drettakis 1 Luc Robert 2 
1 iMAGIS - Models, Algorithms and Geometry for Computer Generated Image Graphics
GRAVIR - IMAG - Laboratoire d'informatique GRAphique, VIsion et Robotique de Grenoble, Inria Grenoble - Rhône-Alpes
Abstract : Computer augmented reality (CAR) is a rapidly emerging field which enables users to mix real and virtual worlds. Our goal is to provide interactive tools to perform common illumination, i.e., light interactions between real and virtual objects, including shadows and relighting (real and virtual light source modification). In particular, we concentrate on virtually modifying real light source intensities and inserting virtual lights and objects into a real scene; such changes can be very useful for virtual lighting design and prototyping. To achieve this, we present a three-step method. We first reconstruct a simplified representation of real scene geometry using semi-automatic vision-based techniques. With the simplified geometry, and by adapting recent hierarchical radiosity algorithms, we construct an approximation of real scene light exchanges. We next perform a preprocessing step, based on the radiosity system, to create unoccluded illumination textures. These replace the original scene textures which contained real light effects such as shadows from real lights. This texture is then modulated by a ratio of the radiosity (which can be changed) over a display factor which corresponds to the radiosity for which occlusion has been ignored. Since our goal is to achieve a convincing relighting effect, rather than an accurate solution, we present a heuristic correction process which results in visually plausible renderings. Finally, we perform an interactive process to compute new illumination with modified real and virtual light intensities. Our results show that we are able to virtually relight real scenes interactively, including modifications and additions of virtual light sources and objects.
Document type :
Journal articles
Complete list of metadata

Cited literature [32 references]  Display  Hide  Download
Contributor : Team Artis Connect in order to contact the contributor
Submitted on : Monday, October 25, 2010 - 2:12:18 PM
Last modification on : Wednesday, May 11, 2022 - 4:48:02 PM
Long-term archiving on: : Wednesday, January 26, 2011 - 2:39:42 AM


  • HAL Id : inria-00527523, version 1



Céline Loscos, George Drettakis, Luc Robert. Interactive Virtual Relighting of Real Scenes. IEEE Transactions on Visualization and Computer Graphics, 2000, 6 (3), pp.289 - 305. ⟨inria-00527523⟩



Record views


Files downloads