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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 36, Iss. 10 — May. 15, 2011
  • pp: 1945–1947

Automatic focusing in digital holography and its application to stretched holograms

P. Memmolo, C. Distante, M. Paturzo, A. Finizio, P. Ferraro, and B. Javidi  »View Author Affiliations


Optics Letters, Vol. 36, Issue 10, pp. 1945-1947 (2011)
http://dx.doi.org/10.1364/OL.36.001945


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Abstract

The searching and recovering of the correct reconstruction distance in digital holography (DH) can be a cumbersome and subjective procedure. Here we report on an algorithm for 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 makes it possible 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 of demonstrating the usefulness of the proposed method, and a comparative analysis has been performed with respect to other existing algorithms developed for DH.

© 2011 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(090.1995) Holography : Digital holography

ToC Category:
Holography

History
Original Manuscript: January 19, 2011
Revised Manuscript: March 23, 2011
Manuscript Accepted: April 16, 2011
Published: May 13, 2011

Citation
P. Memmolo, C. Distante, M. Paturzo, A. Finizio, P. Ferraro, and B. Javidi, "Automatic focusing in digital holography and its application to stretched holograms," Opt. Lett. 36, 1945-1947 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-10-1945

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