  The measurement of the spatio-temporal correlations of light provides an
interesting tool to overcome the traditional limitations of standard imaging,
such as the strong trade-off between spatial resolution and depth of field. In
particular, using correlation plenoptic imaging, one can detect both the
spatial distribution and the direction of light in a scene, pushing both
resolution and depth of field to the fundamental limit imposed by wave-optics.
This allows one to perform refocusing of different axial planes and
three-dimensional reconstruction without any spatial scanning. In the present
work, we investigate the resolution limit in a particular correlation plenoptic
imaging scheme, by considering periodic test patterns, which provide, through
analytical results, a deeper insight in the resolution properties of this
second-order imaging technique, also in comparison with standard imaging.
