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Method of eye aliveness testing and device for eye aliveness testing

  • US 8,061,842 B2
  • Filed: 08/30/2007
  • Issued: 11/22/2011
  • Est. Priority Date: 09/07/2006
  • Status: Active Grant
First Claim
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1. A method of automatically testing whether a human eye is alive, the method comprising the steps:

  • stimulating the pupil of the eye with light radiation emitted by an illuminator at a pre-defined profile of changing light intensity over a time period;

    generating a sequence of images of the pupil with a camera during the time period;

    calculating characteristic dimensions of a hypothetical pupil from each image in the sequence;

    determining a function ƒ

    from the sequence of images, wherein ƒ

    defines changes in the characteristic dimensions of the hypothetical pupil during the time period;

    estimating values for parameters θ

    of a pre-defined mathematical eye aliveness model comprising the parameters θ

    on the basis of the function ƒ

    of the changes of the hypothetical pupil;

    comparing the values of the determined parameters θ

    for the function ƒ

    with a statistical template of values of the parameters θ

    for the selected mathematical eye aliveness model by a classification process; and

    determining whether the eye is alive based on the comparison.

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