  We first extend our recent experiments of correlation imaging through
scattering media to the case of a thick medium, composed of two phase
scatterers placed respectively in the image and the Fourier planes of the
crystal. The spatial correlations between twin photons are still detected but
no more in the form of a speckle. Second, a numerical simulation of the
biphoton wave function is developed and applied to our experimental situation,
with a good agreement.
