Radiometric compensation for a low-cost immersive projection system

Julien Dehos (1) , Eric Zéghers (2) , Christophe Renaud (1) , François Rousselle (1) , Laurent Sarry (3)

1 LIL - Laboratoire d'Informatique du Littoral
2 LLAIC1 - Laboratoire de Logique, Algorithmique et Informatique
3 ERIM-ERI 14 - Equipe de Recherche en Signal et Imagerie Medicale

Catopsys is a low-cost projection system aiming at making mixed reality (virtual, augmented or diminished reality) affordable. It combines a videoprojector, a camera and a convex mirror and works in a non-specific room. This system displays an immersive environment by projecting an image onto the different parts of the room. However, the presence of an uncalibrated projector, heterogeneous materials and light inter-reflections influence the colors of the environment displayed in the room. Radiometric compensation of the projection process enables the system to reduce this problem. In this paper, we present our low-cost immersive projection system and propose a radiometric model and a compensation method which handle the projector response, surface materials and inter-reflections between surfaces. Our method works in two stages. First, the radiometric response of the projection process is evaluated. Then, this radiometric response is used to compensate the projection process in the desired environments.

Mots clés: radiometric compensation; mixed reality; virtual reality; immersive projection

Domaines: Synthèse d'image et réalité virtuelle [cs.GR]

Julien Dehos, Eric Zéghers, Christophe Renaud, François Rousselle, Laurent Sarry. Radiometric compensation for a low-cost immersive projection system. 15th ACM Symposium on Virtual Reality Software and Technology, Oct 2008, Bordeaux, France. pp.130--133, ⟨10.1145/1450579.1450607⟩. ⟨hal-00598693⟩