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

Niamh Fitzgerald; Christopher Dainty; Alexander V. Goncharov

doi:10.1117/12.2287600

27 November 2017 Extending the depth of field in a fixed focus lens using axial colour

Niamh Fitzgerald, Christopher Dainty, Alexander V. Goncharov

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Proceedings Volume 10590, International Optical Design Conference 2017; 105902A (2017) https://doi.org/10.1117/12.2287600
Event: International Optical Design Conference - IODC 2017, 2017, Denver, United States

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.

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Niamh Fitzgerald, Christopher Dainty, and Alexander V. Goncharov "Extending the depth of field in a fixed focus lens using axial colour", Proc. SPIE 10590, International Optical Design Conference 2017, 105902A (27 November 2017); https://doi.org/10.1117/12.2287600

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