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Optical fingerprint sensor with scattered light image detection

  • US 10,354,116 B2
  • Filed: 07/06/2017
  • Issued: 07/16/2019
  • Est. Priority Date: 07/06/2017
  • Status: Active Grant
First Claim
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1. A method for authenticating an input object, comprising:

  • identifying a first pixel within image data associated with the input object, wherein the first pixel is a first ridge pixel or a first valley pixel;

    determining a light scattering characteristic of the input object based on differences in pixel values between the first pixel and one or more pixels neighboring the first pixel;

    identifying at least a second ridge pixel and a second valley pixel within image data associated with a plurality of images;

    determining a first correlation value based on differences in pixel values between the second ridge pixel and one or more pixels neighboring the second ridge pixel;

    determining a second correlation value based on differences in pixel values between the second valley pixel and one or more pixels neighboring the second valley pixel;

    determining a reference light scattering characteristic based on at least one of the first correlation value or the second correlation value; and

    comparing the light scattering characteristic with the reference light scattering characteristic to determine an authentication status of the input object; and

    generating a validation signal indicating the authentication status of the input object.

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