  We propose a experimental scenario of edge enhancement ghost imaging of phase
objects with nonlocal orbital angular momentum (OAM) phase filters. Spatially
incoherent thermal light is separated into two daughter beams, the test and
reference beams, in which the detected objects and phase filters are
symmetrically placed,respectively. The results of simulation experiment prove
that the edge enhanced ghost images of phase objects can be achieved through
the second-order light field intensity correlation measurement owing to the OAM
correlation characteristics. Further simulation results demonstrate that the
edge enhanced ghost imaging system dose not violate a Bell-type inequality for
the OAM subspace, which reveals the classical nature of the thermal light
correlation.
