Gaze Point Tracking Using Polarized Light
First Claim
Patent Images
1. A process comprising:
- illuminating one eye to produce a glint on said eye;
obtaining a glint image of said eye showing said glint on said eye;
further illuminating said eye using polarized light;
obtaining, through a polarizer that can attenuate reflected polarized light, a pupil image of said eye;
determining one glint position at least in part from said glint image, anddetermining one pupil position at least in part from said pupil image.
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Abstract
A process and a system that determine a glint position and a pupil position are disclosed. The process includes illuminating one eye to produce a glint on that eye, and obtaining a glint image of that eye showing that glint on that eye. A glint position is determined at least in part from that glint image. The process further includes illuminating that eye using polarized light, and obtaining, through a polarizer that can attenuate reflected polarized light, a pupil image of that eye. A pupil position is determined at least in part from that pupil image.
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Citations
20 Claims
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1. A process comprising:
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illuminating one eye to produce a glint on said eye; obtaining a glint image of said eye showing said glint on said eye; further illuminating said eye using polarized light; obtaining, through a polarizer that can attenuate reflected polarized light, a pupil image of said eye; determining one glint position at least in part from said glint image, and determining one pupil position at least in part from said pupil image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system comprising:
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a camera for obtaining a glint image and a pupil image; a glint illuminator for illuminating an eye to produce a glint that is represented in said glint image; a pupil illuminator for illuminating said eye so that a pupil is represented in said pupil image; polarizers in an optical path between said pupil illuminator and said camera, said polarizers cooperating to attenuate light reflected by said eye relative to light scattered by said eye; and a controller which causes said glint and pupil images to be obtained within a total time interval of 0.2 s, and analyzes said images so as to compare at least one glint position with at least one pupil position, said at least one glint position being determined at least in part from said glint image, said at least one pupil position being determined from said pupil image. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification