Refocusing criterion via sparsity measurements in digital holography
Authors: Memmolo P., Paturzo M., Javidi B., Netti P.A., Ferraro P.
Autors Affiliation: Center for Advanced Biomaterials for Health Care@CRIB, Istituto Italiano di tecnologia, Largo Barsanti e Matteucci 53, 80125 Napoli, Italy;
CNR-Istituto Nazionale di Ottica, via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy;
ECE Department, University of Connecticut, U-157, Storrs, Connecticut 06269, USA
ECE Department, University of Connecticut, U-157, Storrs, Connecticut 06269, USA.
Abstract: Several automatic approaches have been proposed in the past to compute the refocus distance in digital holography (DH). However most of them are based on a maximization or minimization of a suitable amplitude image contrast measure, regarded as a function of the reconstruction distance parameter. Here we show that, by using the sparsity measure coefficient regarded as a refocusing criterion in the holographic reconstruction, it is possible to recover the focus plane and, at the same time, establish the degree of sparsity of digital holograms, when samples of the diffraction Fresnel propagation integral are used as a sparse signal representation. We employ a sparsity measurement coefficient known as Gini
Journal/Review: OPTICS LETTERS
Volume: 39 (16) Pages from: 4719 to: 4722
More Information: We are very grateful to Dr. Andrea Finizio for acquiring the holograms of the mouse\’s cell and the astronaut puppet. This work was supported by Progetto Bandiera \”La Fabbrica del Futuro\” in the framework of the funded project \”Plastic lab-on-chips for the optical manipulation of single cells\” (PLUS).KeyWords: digital holography; image analysis; image reconstruction techniques; amplitude analysis; microscopyDOI: 10.1364/OL.39.004719Citations: 86data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-08-07References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here