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Long-range polarimetric imaging through fog

Abstract : We report an experimental implementation of long-range polarimetric imaging through fog over kilometric distance in real field atmospheric conditions. An incoherent polarized light source settled on a telecommunication tower is imaged at a distance of 1.3 km with a snapshot polarimetric camera including a birefringent Wollaston prism, allowing simultaneous acquisition of two images along orthogonal polarization directions. From a large number of acquisitions datasets and under various environmental conditions (clear sky/fog/haze, day/night), we compare the efficiency of using polarized light for source contrast increase with different signal representations (intensity, polarimetric difference, polarimetric contrast, etc.). With the limited-dynamics detector used, a maximum fourfold increase in contrast was demonstrated under bright background illumination using polarimetric difference image.
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Submitted on : Monday, March 16, 2015 - 4:49:43 PM
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Julien Fade, Swapnesh Panigrahi, Anthony Carré, Ludovic Frein, Cyril Hamel, et al.. Long-range polarimetric imaging through fog. Applied optics, Optical Society of America, 2014, 53 (18), pp.3854-3865. ⟨10.1364/AO.53.003854⟩. ⟨hal-01025267⟩



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