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Edge and Contrast Enhancement Using Spatially Incoherent Correlation Holography Techniques

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posted on 2024-07-26, 14:55 authored by Vijay Anand, Joseph Rosen, Soon Hock NgSoon Hock Ng, Tomas Katkus, Denver P. Linklater, Elena Ivanova, Saulius JuodkazisSaulius Juodkazis
Image enhancement techniques (such as edge and contrast enhancement) are essential for many imaging applications. In incoherent holography techniques such as Fresnel incoherent correlation holography (FINCH), the light from an object is split into two, each of which is modulated differently from one another by two different quadratic phase functions and coherently interfered to generate the hologram. The hologram can be reconstructed via a numerical backpropagation. The edge enhancement procedure in FINCH requires the modulation of one of the beams by a spiral phase element and, upon reconstruction, edge-enhanced images are obtained. An optical technique for edge enhancement in coded aperture imaging (CAI) techniques that does not involve two-beam interference has not been established yet. In this study, we propose and demonstrate an iterative algorithm that can yield from the experimentally recorded point spread function (PSF), a synthetic PSF that can generate edge-enhanced reconstructions when processed with the object hologram. The edge-enhanced reconstructions are subtracted from the original reconstructions to obtain contrast enhancement. The technique has been demonstrated on FINCH and CAI methods with different spectral conditions.

Funding

Electro-Optical Primers for Safe Use and Clean Manufacturing

Australian Research Council

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PDF (Published version)

ISSN

2304-6732

Journal title

Photonics

Volume

8

Issue

6

Article number

224

Pagination

1 p

Publisher

MDPI AG

Copyright statement

Copyright © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

Language

eng

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