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Eyelid shape estimation

  • US 10,089,526 B2
  • Filed: 08/16/2016
  • Issued: 10/02/2018
  • Est. Priority Date: 08/21/2015
  • Status: Active Grant
First Claim
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1. A method for eye tracking, comprising:

  • under control of a hardware processor;

    generating an eye-box over an eye in an eye image for determining an eye pose of the eye in the eye image, wherein the eye pose comprises a direction toward which the eye is looking,wherein the eye-box has an upper edge and a lower edge,wherein the upper edge overlays a portion of an upper eyelid of the eye, andwherein the lower edge overlays a portion of a lower eyelid of the eye;

    generating a plurality of radial lines extending from approximately the center of the eye-box to the upper edge or the lower edge;

    determining candidate points on the plurality of radial lines using an edge detector;

    determining parameters of a parabolic fit curve from a subset of the candidate points, wherein the parabolic fit curve is an estimation of an eyelid shape of the eye in the eye image;

    determining a score of the parabolic fit curve is above a threshold score using the parameters of the parabolic fit curve;

    determining that the parabolic fit curve is a preferred estimation of the eyelid shape of the eye in the eye image; and

    determining the eye pose of the eye in the eye image using parameters of the preferred estimation of the eyelid shape; and

    tracking the eye in the eye image using the eye pose of the eye in the eye image.

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