Fig. 1

Scheme of the imaging setup. The source produces the field with the density matrix ρ; this field passes through the object described by the transmission function \(A(\overrightarrow {\mathbf{s}} )\) and then through the imaging system characterized by the point-spread function \(h(\overrightarrow {\mathbf{s}} ,\overrightarrow {\mathbf{r}} )\). Afterward, the field is detected at the image plane