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Proceedings Paper

Extending the depth of field in a fixed focus lens using axial colour
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Paper 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.

Paper Details

Date Published: 27 November 2017
PDF: 7 pages
Proc. SPIE 10590, International Optical Design Conference 2017, 105902A (27 November 2017); doi: 10.1117/12.2287600
Show Author Affiliations
Niamh Fitzgerald, National Univ. of Ireland, Galway (Ireland)
Christopher Dainty, FotoNation Ltd. (Ireland)
Alexander V. Goncharov, National Univ. of Ireland, Galway (Ireland)

Published in SPIE Proceedings Vol. 10590:
International Optical Design Conference 2017
Peter P. Clark; Julius A. Muschaweck; Richard N. Pfisterer; John R. Rogers, Editor(s)

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