Method of precision eye-tracking through use of iris edge based landmarks in eye geometry
First Claim
1. A method of identifying at least one landmark in the eye comprising the steps of:
- digitizing an image of the eye;
identifying at least a portion of the edge of the iris from the digitized image of the eye; and
calculating a centroid of an area defined by the identified edge portion of the iris wherein the centroid forms at least one landmark in the eye.
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Accused Products
Abstract
In the field of eye tracking, greater accuracy or resolution in monitoring movement of the eye can be gained by digitizing the eye, and tracking the movement of a landmark with fixed size and a fixed location relative to the eye'"'"'s local coordinate system. The edge of the iris can be used as such a fixed landmark. Through the location and or establishment of at least a portion of the outer edge of the iris and/or an iris center point, both large and small scale eye movements, including but not limited to micro-tremors, can be traced with a higher degree of accuracy. This will aid in the diagnosis of diseases, assessing state of consciousness, and defining brainstem death.
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Citations
18 Claims
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1. A method of identifying at least one landmark in the eye comprising the steps of:
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digitizing an image of the eye; identifying at least a portion of the edge of the iris from the digitized image of the eye; and calculating a centroid of an area defined by the identified edge portion of the iris wherein the centroid forms at least one landmark in the eye. - View Dependent Claims (2, 3, 4, 5)
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6. A method of eye tracking comprising the steps of:
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digitizing an image of the eye; identifying at least a portion of the edge of the iris from the digitized image of the eye; establishing at least one fixed landmark based upon the identified portion of the edge of the iris; and tracking the movement of the at least one landmark over time. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method of assessing the state of consciousness of a subject comprising the steps of:
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digitizing an image of the eye; identifying at least a portion of the edge of the iris from the digitized image of the eye; establishing at least one fixed landmark based upon the identified portion of the edge of the iris; tracking the movement of the at least one landmark over time; identifying small eye movements including micro-tremors from a review of the tracking of the movement of the at least one landmark over time; and utilizing the tracked small eye movement in an assessment of the state of consciousness of a subject. - View Dependent Claims (15, 16, 17, 18)
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Specification