Incoherent digital holograms acquired by interferenceless coded aperture correlation holography system without refractive lenses

TL;DR

This paper introduces a lensless, interferenceless digital holography method using coded aperture correlation, enabling 3D imaging without lenses, suitable for thick and multi-plane objects, with noise suppression techniques demonstrated.

Contribution

The paper presents a novel lensless, interferenceless digital holography approach based on coded aperture correlation, expanding 3D imaging capabilities without traditional lenses.

Findings

Successful 3D reconstruction of multi-plane objects

Effective noise suppression in hologram reconstruction

Comparable results to lens-based imaging for thick objects

Abstract

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.