11 June 2012 Polarimetric imaging and radiometry in shallow waters
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Abstract
Imaging in scattering media with the purpose of object identification has always been a challenging task. In the ocean, and especially in coastal areas, the situation is one of the worst: absorption and scattering by suspended and dissolved particles take away most of the information and blur the image of the target to be identified. In addition, one has also to take into account the variability of the bottom which, being close to the surface, plays an important role in the resulting integrated light field. Our goal in this study is to gain insight into the effects of the variable environments on the complex polarized underwater realm. We analyze the polarized tridimensional underwater environment. The instruments deployed were an underwater hyperspectral and multi-angular polarimeter, whose accuracy and exactness of results have been previously validated by the means of different radiative transfer calculations; and a green band full-Stokes polarimetric video camera, enclosed in a custom made underwater housing. The results presented here were collected during the first field deployment of the imaging camera. An in-situ validation of the camera with the polarimeter has been obtained and the results have been used to validate the values of the Stokes elements in the images, both for the water column itself and for the underlying bottom.
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Alberto Tonizzo, Alexander Gilerson, Carlos Carrizo, Jean-Paul Israel, Sam Ahmed, "Polarimetric imaging and radiometry in shallow waters", Proc. SPIE 8364, Polarization: Measurement, Analysis, and Remote Sensing X, 83640U (11 June 2012); doi: 10.1117/12.919938; https://doi.org/10.1117/12.919938
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