  Entangled-photon coincidence imaging is a method to nonlocally image an
object by transmitting a pair of entangled photons through the object and a
reference optical system, respectively. The image of the object can be
extracted from the coincidence rate of these two photons. From a classical
perspective, the image is proportional to the fourth-order correlation function
of the wave field. Using classical statistical optics, we study a particular
aspect of coincidence imaging with incoherent sources. As an application, we
give a proposal to realize lensless Fourier-transform imaging, and discuss its
applicability in x-ray diffraction.
