Active lighting applied to three-dimensional reconstruction of specular metallic surfaces by polarization imaging

Olivier Morel (1) , Christophe Stolz (1) , Fabrice Mériaudeau (1) , Patrick Gorria (1)

1 Le2i - Laboratoire Electronique, Informatique et Image [UMR6306]

In the field of industrial vision, the three-dimensional inspection of highly reflective metallic objects is still a delicate task. We deal with a new automated three-dimensional inspection system based on polarization analysis. We first present an extension of the shape-from-polarization method for dielectric surfaces to metallic surfaces. Then, we describe what we believe to be a new way of solving the ambiguity concerning the normal orientation with an active lighting system. Finally, applications to shape-defect detection are discussed, and the efficiency of the system to discriminate defects on specular metallic objects made by stamping and polishing is presented.

Mots clés: polarization imaging; shape from polarization; metallic surfaces; active lighting

Domaines: Vision par ordinateur et reconnaissance de formes [cs.CV]

Olivier Morel, Christophe Stolz, Fabrice Mériaudeau, Patrick Gorria. Active lighting applied to three-dimensional reconstruction of specular metallic surfaces by polarization imaging. Journal of Optics A: Pure and Applied Optics, 2006, 45 (17), pp.4062-4068. ⟨hal-00514527⟩