Fitzgerald, N;
Dainty, C;
Goncharov, AV;
(2017)
Extending the depth of field in a fixed focus lens using axial colour.
In: Clark, PP and Muschaweck, JA and Pfisterer, RN and Rogers, JR, (eds.)
International Optical Design Conference 2017.
(pp. 105902A:1-105902A:7).
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Abstract
We propose a method of extending the depth of field (EDOF) of conventional lenses for a low cost iris recognition front-facing smartphone camera. Longitudinal chromatic aberration (LCA) can be induced in the lens by means of dual wavelength illumination. The EDOF region is then constructed from the sum of the adjacent depths of field from each wavelength illumination. The lens parameters can be found analytically with paraxial raytracing. The extended depth of field is dependant on the glass chosen and position of the near object point.
| Type: | Proceedings paper |
|---|---|
| Title: | Extending the depth of field in a fixed focus lens using axial colour |
| Event: | IODC 2017: International Optical Design Conference, 9-13 July 2017, Denver, USA |
| Location: | Denver, CO |
| Dates: | 09 July 2017 - 13 July 2017 |
| ISBN-13: | 9781510616721 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2287600 |
| Publisher version: | https://doi.org/10.1117/12.2287600 |
| Language: | English |
| Additional information: | This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Chromatic aberration, Optical design, Iris imaging, Extended depth of field |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10045562 |
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