Surface Reconstruction of Transparent Objects by Polarization Imaging

Abstract

This paper focuses a method to acquire the surface of transparent objects for 3D measurement. The technique relies on the so called ¿Shape from Polarization¿ technique. The principle of this polarization imaging technique is as follows: after being reflected, an unpolarized light becomes partially linearly polarized. The surface normals can be evaluated by analyzing their polarization parameters and by knowing the refractive index of the object to be controlled. Finally, the 3D shape is obtained by integrating the normals field. After an introduction to expose the problematic, section 2 exposes the principles of polarization technique. The third and the last section deal with the polarimetric camera and the whole experimental system.