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RESEARCH PRODUCT
Active lighting applied to three dimensional reconstruction of specular metallic surfaces by polarization imaging
Olivier Morelsubject
imagerie polarimétriqueéclairage actifacquisition tridimensionnellespecular metallic surfacesactive lighting systemshape from polarizationsurfaces métal- liques spéculaireschamp de normalestridimensional acquisitionheight from gradients[SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processingdescription
This thesis deals with a new automated tridimensional inspection system for specular metallic surfaces, based on polarization analysis. We first present an extension of the ‘Shape from Polarization' method for dielectric to metallic surfaces. After being reflected, an unpolarized light wave becomes partially linearly polarized, depending on the surface normal and on the refractive index of the media it impinges on. Hence, by measuring the polarization parameters of the reflected light, the surface normals are computed. The ambiguity concerning the normals orientation is solved here with a new active lighting system. Then, we describe and compare numerical methods for reconstructing the tridimensional shape from the normals. Finally, the description of the whole acquisition prototype is given, and an application on shape defects detection is discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-01-01 |