Abstract

This Letter presents an alternative approach for image refocusing in digital Fresnel holography. In the literature, a large majority of reported focus detection criteria is based on amplitude contrast or phase contrast. We propose a focus detection criterion based on the speckle phase coherence factor. This factor reaches its maximum value at the best focus distance. At any reconstruction distance, estimation of the coherence factor is based on robust noise estimation from anisotropic diffusion. We propose a theoretical relation to estimate the coherence factor from the measured standard deviation. Experimental results for the case of three-color holographic imaging and interferometry are provided. Experimental results show the suitability of the proposed approach for image plane refocusing.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Reduction of speckle noise in holographic images using spatial jittering in numerical reconstructions

Mohamed Haouat, Jorge Garcia-Sucerquia, Abdelhamid Kellou, and Pascal Picart
Opt. Lett. 42(6) 1047-1050 (2017)

Refocus criterion for both phase and amplitude objects in digital holographic microscopy

Frank Dubois, Ahmed El Mallahi, Jérôme Dohet-Eraly, and Catherine Yourassowsky
Opt. Lett. 39(15) 4286-4289 (2014)

Quality assessment of refocus criteria for particle imaging in digital off-axis holography

Soumaya Kara Mohammed, Larbi Bouamama, Derradji Bahloul, and Pascal Picart
Appl. Opt. 56(13) F158-F166 (2017)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription