Patent ID: 6028949
Filing Date: 2000-02-22
Classification: G06K

Abstract:
A method for verifying that an eye is present in an image comprised of pixels each having an x, y coordinate location in the image and determining its location comprised of the steps of:a. selecting an image which is believed to contain an eye having an iris comprised of a set of pixels and a pupil comprised of a second set of pixels, a radius of the pupil being given as r.sub.p and a radius of the iris being given as r.sub.i ; and the eye is believed to be located at a selected location;b. computing r.sub.p /r.sub.ic. if r.sub.p /r.sub.i is less than 0.5 then determining a centerpoint x.sub.i ; y.sub.i of the iris and a centerpoint x.sub.p ; y.sub.p of the pupil and calculatingD=((x.sub.i -x.sub.p).sup.2 +(y.sub.i,-y.sub.p).sup.2).sup.1/2d. if D<0.1 r.sub.i reporting an eye image is present at the selected location; ande. if r.sub.p /r.sub.i is greater than or equal to 0.5 or D is greater than or equal to 0.1 r.sub.i then concluding that an eye is not present at the selected location.