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 Andy |
| 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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