  Techniques based on classical and quantum correlations in light beams, such
as ghost imaging, allow us to overcome many limitations of conventional imaging
and sensing protocols. Despite their advantages, applications of such
techniques are often limited in practical scenarios where the position and the
longitudinal extension of the target object are unknown. In this work, we
propose and experimentally demonstrate a novel imaging technique, named Light
Field Ghost Imaging, that exploits light correlations and light field imaging
principles to enable going beyond the limitations of ghost imaging in a wide
range of applications. Notably, our technique removes the requirement to have
prior knowledge of the object distance allowing the possibility of refocusing
in post-processing, as well as performing 3D imaging while retaining all the
benefits of ghost imaging protocols.
