  We present a lensless, interferenceless incoherent digital holography
technique based on the principle of coded aperture correlation holography. The
acquired digital hologram by this technique contains a three-dimensional image
of some observed scene. Light diffracted by a point object is modulated using a
random-like coded phase mask (CPM) and the intensity pattern is recorded and
composed as a point spread hologram (PSH). A library of PSH is created using
the same CPM by moving the pinhole to all possible axial locations. Intensity
diffracted through the same CPM from an object placed within the axial limits
of the PSH library is recorded by a digital camera. The recorded intensity this
time is composed as the object hologram. The image of the object at any axial
plane is reconstructed by cross-correlating the object hologram with the
corresponding component of the PSH library. The reconstruction noise attached
to the image is suppressed by various methods. The reconstruction results of
multi-plane and thick objects by this technique are compared with regular
lens-based imaging.
