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Imagerie polarimétrique active adaptative infrarouge pour des applications de détection et de décamouflage

Nicolas Vannier 1
1 Laboratoire Charles Fabry / Spim
LCF - Laboratoire Charles Fabry
Abstract : We designed and built an active polarimetric imager with laser illumination at 1:55 um wavelength. It cangenerate and analyze any polarization state on the Poincaré sphere. It let us the possibility to perform apolarimetric contrast optimization by analyzing the scene with an ultrafast active-contour-based segmentationalgorithm. This imagins systeme allow to compare several imaging modes having different numbers ofpolarimetric degrees of freedom. We address the detection of manufactured objects in different types ofenvironments with active polarimetric imaging to illustrate the capabilities of the techniques. We demonstratethe effciency of active polarimetric imaging for decamouffage and hazardous object detection, and underlinethe characteristics that a polarimetric imager aimed at this type of application should possess. We show thatin most encountered scenarios the Mueller matrices are nearly diagonal, and suffcient detection performancecan be obtained with simple polarimetric imaging systems having reduced degrees of freedom. Moreover,intensity normalization of images is of paramount importance to better reveal polarimetric contrast.
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Nicolas Vannier. Imagerie polarimétrique active adaptative infrarouge pour des applications de détection et de décamouflage. Optique [physics.optics]. Université Paris Saclay (COmUE), 2016. Français. ⟨NNT : 2016SACLO008⟩. ⟨tel-01445747⟩

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