Gaze Tracking Using Polarized Light
First Claim
Patent Images
1. A process comprising:
- illuminating at least one eye to produce a glint on said eye;
obtaining a glint image of an eye showing said glint on said eye;
illuminating said eye using polarized light;
obtaining a pupil image of said eye using a polarizer to attenuate reflected polarized light; and
determining at least one glint position at least in part from said glint image and at least one pupil position at least in part from said pupil image.
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Abstract
A gaze-tracking system uses separate “glint” and “pupil” images to determine the position of the pupil relative to the position of the glint. Since separate images are obtained, the exposures can be independently optimized for each image'"'"'s intended purpose (e.g., locating the glint or locating the pupil, respectively). Polarizers are used to eliminate the glint in one image. This more saliently reveals the pupil, allowing its position relative to the glint to be determined more precisely, and enhancing the accuracy and robustness of the system.
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Citations
18 Claims
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1. A process comprising:
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illuminating at least one eye to produce a glint on said eye; obtaining a glint image of an eye showing said glint on said eye; illuminating said eye using polarized light; obtaining a pupil image of said eye using a polarizer to attenuate reflected polarized light; and determining at least one glint position at least in part from said glint image and at least one pupil position at least in part from said pupil image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system comprising:
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one or more cameras for obtaining glint and pupil images; a glint illuminator for illuminating at least one eye to produce at least one glint that is represented in said glint image; a pupil illuminator for illuminating said at least one eye so that at least one 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 at least one eye relative to light scattered by said at least one eye; and a controller for causing said glint and pupil images to be obtained within one second of each other and for analyzing 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 at least one pupil image. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification