19 May 2008 Shape measurement of transparent objects with polarization imaging
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Abstract
This paper deals with a 3D measurement system based on the "Shape from Polarization" method applied for transparent objects. The method is an application of polarization imaging techniques and its principle is as follows: after being reflected, an unpolarized light becomes partially linearly polarized. By analyzing its polarization parameters and by knowing the refractive index of the object to be controlled, the surface normals can be evaluated. Finally, the 3D shape is obtained by integrating the normals field. Section 1 introduces the opportunity to use polarisation imaging, section 2 recalls the measurement method and describes the angle measurement ambiguities naturally appearing and discusses how to overcome them, section 3 introduces the measurement setup and a part of its calibration and section 4 describes some examples on transparent objects.
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Mathias Ferraton, Mathias Ferraton, Christophe Stolz, Christophe Stolz, Fabrice Mériaudeau, Fabrice Mériaudeau, } "Shape measurement of transparent objects with polarization imaging", Proc. SPIE 7000, Optical and Digital Image Processing, 70001R (19 May 2008); doi: 10.1117/12.781621; https://doi.org/10.1117/12.781621
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