Display of an analytical model for backscattered luminance and a full-field range gated imaging system for vision in fog

Vision through diuse media (fog, rain, smoke, snow, etc) is a large problem due to interactions between light and particles composing the medium. In this paper, one focuses particulary on scattering media as fog. Therefore, an analytical model for the determination of backscattered luminance induced by fog is described here. The model is based on the Mie's theory and takes the optical device geometry into account. An analysis of its resulst leads to several conclusions. The most notable and obvious one is that eliminate backscattering light is necessary to have good-contrasted images. Starting from this premise, one presents here a range-gated active imaging system enable to perform a temporal selection between backscattering pollution and photons holding optical information.