Extended depth-of-field imaging and ranging in a snapshot

Zammit, P., Harvey, A. R. and Carles Santacana, G. (2014) Extended depth-of-field imaging and ranging in a snapshot. Optica, 1(4), pp. 209-216. (doi:10.1364/OPTICA.1.000209)

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Abstract

Traditional approaches to imaging require that an increase in depth of field is associated with a reduction in numerical aperture, and hence with a reduction in resolution and optical throughput. In their seminal work, Dowski and Cathey reported how the asymmetric point-spread function generated by a cubic-phase aberration encodes the detected image such that digital recovery can yield images with an extended depth of field without sacrificing resolution [Appl. Opt. 34, 1859 (1995)]. Unfortunately recovered images are generally visibly degraded by artifacts arising from subtle variations in point-spread functions with defocus. We report a technique that involves determination of the spatially variant translation of image components that accompanies defocus to enable determination of spatially variant defocus. This in turn enables recovery of artifact-free, extended depth-of-field images together with a two-dimensional defocus and range map of the imaged scene. We demonstrate the technique for high-quality macroscopic and microscopic imaging of scenes presenting an extended defocus of up to two waves, and for generation of defocus maps with an uncertainty of 0.036 waves.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Carles Santacana, Dr Guillem and Zammit, Mr Paul and Harvey, Professor Andrew
Authors: Zammit, P., Harvey, A. R., and Carles Santacana, G.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optica
Publisher:Optical Society of America
ISSN:2334-2536
ISSN (Online):2334-2536
Published Online:26 September 2014
Copyright Holders:Copyright © 2014 The AuthorsOptical Society of America
First Published:First published in Optica 1(4):209-216
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
608951Engineering and Physical Sciences Doctoral Training Grant 2012-16Mary Beth KneafseyEngineering & Physical Sciences Research Council (EPSRC)EP/K503058/1VPO VICE PRINCIPAL RESEARCH & ENTERPRISE