Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Comparative analysis of autofocus functions in digital in-line phase-shifting holography

Not Accessible

Your library or personal account may give you access

Abstract

Numerical reconstruction of digital holograms relies on a precise knowledge of the original object position. However, there are a number of relevant applications where this parameter is not known in advance and an efficient autofocusing method is required. This paper addresses the problem of finding optimal focusing methods for use in reconstruction of digital holograms of macroscopic amplitude and phase objects, using digital in-line phase-shifting holography in transmission mode. Fifteen autofocus measures, including spatial-, spectral-, and sparsity-based methods, were evaluated for both synthetic and experimental holograms. The Fresnel transform and the angular spectrum reconstruction methods were compared. Evaluation criteria included unimodality, accuracy, resolution, and computational cost. Autofocusing under angular spectrum propagation tends to perform better with respect to accuracy and unimodality criteria. Phase objects are, generally, more difficult to focus than amplitude objects. The normalized variance, the standard correlation, and the Tenenbaum gradient are the most reliable spatial-based metrics, combining computational efficiency with good accuracy and resolution. A good trade-off between focus performance and computational cost was found for the Fresnelet sparsity method.

© 2016 Optical Society of America

Full Article  |  PDF Article
More Like This
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)

Autofocusing in digital holography using eigenvalues

Anik Ghosh, Rishikesh Kulkarni, and Pranab Kumar Mondal
Appl. Opt. 60(4) 1031-1040 (2021)

Fast autofocusing in digital holography using the magnitude differential

Meng Lyu, Caojin Yuan, Dayan Li, and Guohai Situ
Appl. Opt. 56(13) F152-F157 (2017)

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 Optica member, or as an authorized user of your institution.

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

Figures (7)

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

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

Tables (4)

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

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

Equations (38)

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

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

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved