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Extended depth-of-field biometric system

  • US 9,727,783 B2
  • Filed: 10/12/2016
  • Issued: 08/08/2017
  • Est. Priority Date: 04/23/2015
  • Status: Expired due to Fees
First Claim
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1. A method of processing an extended depth-of-field (EDOF) image of an iris at an imaging wavelength λ

  • IM, comprising;

    capturing a raw image of the iris, wherein the raw image has a reduced modulation transfer function (MTF) based on an optical system having an amount of spherical aberration (SA) of 0.2λ

    IM

    SA≦



    IM;

    normalizing the raw image;

    performing an MTF enhancement of the normalized raw image in polar coordinates to generate a MTF enhanced image; and

    generating an iris code from the MTF enhanced image.

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