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

Abstract : 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.
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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, IOP Publishing, 2006, 45 (17), pp.4062-4068. ⟨hal-00514527⟩

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