EYE TRACKING SYSTEM AND METHOD
First Claim
1. An eye tracking system which tracks a gaze point of a user, said system comprising:
- a head tracking system which determines the location and orientation of the head of said user;
an eye tracking system which determines the location and orientation of an eye of said user;
a display device which presents a calibrating image to said user; and
a processor which calculates the location of the center of rotation of said eye and the location of the gaze point of said user based on the location and orientation of the head of said user, the location and orientation of the center of said eye, and the location of a plurality of calibration points presented within the calibrating image.
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Accused Products
Abstract
An eye tracking system and method is provided giving persons with severe disabilities the ability to access a computer through eye movement. A system comprising a head tracking system, an eye tracking system, a display device, and a processor which calculates the gaze point of the user is provided. The eye tracking method comprises determining the location and orientation of the head, determining the location and orientation of the eye, calculating the location of the center of rotation of the eye, and calculating the gaze point of the eye. A method for inputting to an electronic device a character selected by a user through alternate means is provided, the method comprising placing a cursor near the character to be selected by said user, shifting the characters on a set of keys which are closest to the cursor, tracking the movement of the character to be selected with the cursor, and identifying the character to be selected by comparing the direction of movement of the cursor with the direction of movement of the characters of the set of keys which are closest to the cursor.
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Citations
23 Claims
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1. An eye tracking system which tracks a gaze point of a user, said system comprising:
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a head tracking system which determines the location and orientation of the head of said user; an eye tracking system which determines the location and orientation of an eye of said user; a display device which presents a calibrating image to said user; and a processor which calculates the location of the center of rotation of said eye and the location of the gaze point of said user based on the location and orientation of the head of said user, the location and orientation of the center of said eye, and the location of a plurality of calibration points presented within the calibrating image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15, 22)
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9. An eye tracking method for locating the gaze point of a user, said method comprising the steps of:
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determining the location and orientation of the head of said user; determining the location and orientation of an eye of said user; presenting a calibrating image to said user, said calibrating image having calibration points; calculating the location of the center of rotation of said eye; and calculating the location of the gaze point of said eye based on the location and orientation of the head, the location and orientation of said eye, the location of the calibration points, and the location of the center of rotation of said eye. - View Dependent Claims (10, 11, 12, 13, 14)
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16. A method for inputting to an electronic device a character selected by a user controlling a cursor, said method comprising:
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displaying an array of characters, said array of characters comprising keys having multiple characters displayed thereon; placing the cursor near the character to be selected by said user; shifting the characters on a set of keys which are closest to the cursor such that characters not at similar positions on adjacent keys move in different directions and characters on the same key move in different directions; tracking the movement of the character to be selected with the cursor; and identifying the character to be selected by comparing the direction of movement of the cursor with the direction of movement of the characters of said set of keys which are closest to the cursor. - View Dependent Claims (17, 18, 19, 20, 21, 23)
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Specification