An algorithm for the estimation of the in-focus distance for speckle holograms
Authors: Memmolo P., Distante C., Paturzo M., Finizio A., Ferraro P., Javidi B.
Autors Affiliation: CNR – Istituto Nazionale di Ottica, via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy; DIBET, Università degli Studi di Napoli “Federico II”, via Claudio 21, 80125 Napoli, Italy; CNR – Istituto Nazionale di Ottica, viale della Libertà 3, 73010 Arnesano (LE), Italy; Electrical and Computer Engineering Department, University of Connecticut, U-2157 Storrs, Connecticut 06269-2157, USA
Abstract: Searching and recovering the correct reconstruction distance in digital holography can be a cumbersome and subjective procedure. Here we show an algorithm for the automatically estimating the in-focus image and recovering the correct reconstruction distance for speckle holograms. We have tested the approach in determining the reconstruction distances of stretched digital holograms. Stretching a hologram with a variable elongation parameter gives us the possibility to change the in-focus distance of the reconstructed image. In this way, the proposed algorithm can be verified at different distances by dispensing the recording of different holograms. Experimental results are shown with the aim to demonstrate the usefulness of the proposed method and a comparative analysis has been performed with respect to other existing algorithms developed for digital holography.
Journal/Review: PROCEEDINGS OF SPIE
Volume: 8082 Pages from: 808209 to: 808209