This study concerns the multiple scattering of light in random granular
systems and the analysis of the image formed by the light scattered by a random
medium. We developed an imagery method with high grey level resolution for
visualization and analysis of the intensity profile in the backscattering spot image.
We further present statistical models for the radiative transfer in granular media
only involving the photon mean path length, the asymmetry factor and the
absorption probability of photons. A renormalization of the photon trajectory in
the medium gives a photon transport equation for anisotropic scattering and leads
to an analytical expression for the intensity profile in the backscattering spot. We
finally compare the results from imagery experiments with the predictions from
numerical simulations and statistical models.