Figure 2
From: High-resolution far-field ghost imaging via sparsity constraint

The characters of some important parameters used in the experiment.
(a). The profile of the laser beam through the hole before the lens f and its cross-section at maximum value (along the red-line direction of the image); (b). the profile of the laser beam on the diffuser and its cross-section at maximum value (along the red-line direction of the image); (c). an image of a single speckle pattern record by the CCD camera Dr; (d). the normalized second-order correlation distribution of light field at the reference detection plane; (e). the Fourier-transform distribution of (d).