Gaze tracking system, eye-tracking assembly and an associated method of calibration
First Claim
1. A method of calibrating a gaze tracking system relative to an object, wherein the gaze tracking system includes an eye tracking assembly capable of tracking movement of at least one eye of an operator and a head tracking sensor capable of tracking movement of a head of the operator, said method comprising:
- repeatedly moving the head tracking sensor to a plurality of different positions;
measuring a position of the at least one eye and an angle offset of a line of sight of the at least one eye relative to a first reference point, and measuring the position of the head tracking sensor and an angle offset of the head tracking sensor relative to a second reference position, wherein measuring occurs for each of the plurality of different positions; and
calibrating the gaze tracking system based upon the measured positions of the at least one eye, the offset angles of the at least one eye, the positions of the head tracking sensor and the offset angles of the head tracking sensor relative to the second reference position.
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Abstract
A system for tracking a gaze of an operator includes a head-mounted eye tracking assembly, a head-mounted head tracking assembly and a processing element. The head-mounted eye tracking assembly comprises a visor having an arcuate shape including a concave surface and an opposed convex surface. The visor is capable of being disposed such that at least a portion of the visor is located outside a field of view of the operator. The head-mounted head tracking sensor is capable of repeatedly determining a position of the head to thereby track movement of the head. In this regard, each position of the head is associated with a position of the at least one eye. Thus, the processing element can repeatedly determine the gaze of the operator, based upon each position of the head and the associated position of the eyes, thereby tracking the gaze of the operator.
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Citations
15 Claims
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1. A method of calibrating a gaze tracking system relative to an object, wherein the gaze tracking system includes an eye tracking assembly capable of tracking movement of at least one eye of an operator and a head tracking sensor capable of tracking movement of a head of the operator, said method comprising:
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repeatedly moving the head tracking sensor to a plurality of different positions; measuring a position of the at least one eye and an angle offset of a line of sight of the at least one eye relative to a first reference point, and measuring the position of the head tracking sensor and an angle offset of the head tracking sensor relative to a second reference position, wherein measuring occurs for each of the plurality of different positions; and calibrating the gaze tracking system based upon the measured positions of the at least one eye, the offset angles of the at least one eye, the positions of the head tracking sensor and the offset angles of the head tracking sensor relative to the second reference position. - View Dependent Claims (2, 3, 4, 5)
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6. A calibration system for calibrating a gaze tracking system relative to an object, wherein the gaze tracking system includes an eye tracking assembly capable of tracking movement of at least one eye of an operator and a head tracking sensor capable of tracking movement of a head of the operator, said calibration system comprising:
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a processing element capable of repeatedly prompting movement of the head tracking sensor to a plurality of different positions, wherein the processing element is capable of measuring a position of the at least one eye and an angle offset of a line of sight of the at least one eye relative to a first reference point, and measuring the position of the head tracking sensor and an angle offset of the head tracking sensor relative to a second reference position, wherein measuring occurs for each of the plurality of different positions, and wherein the processing element is capable of calibrating the gaze tracking system based upon the measured positions of the at least one eye, the offset angles of the at least one eye, the positions of the head tracking sensor and the offset angles of the head tracking sensor relative to the second reference position. - View Dependent Claims (7, 8, 9, 10)
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11. A method for tracking movement of at least one eye of an operator, said method comprising:
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providing an eye tracking assembly, the eye tracking assembly comprising; an at least partially reflective visor capable of being disposed such that the visor is capable of reflecting an image of the at least one eye, wherein the visor is capable of being disposed such that at least a portion of the visor is located outside a field of view of the operator; an image capture device disposed in optical communication with the visor; and a lens disposed in an optical path of the image capture device, the image capture device having an effective focus based upon an optical power of the visor and an optical power of the lens; and tracking movement of the at least one eye at the image capture device based upon the image of the at least one eye reflected by the visor. - View Dependent Claims (12, 13, 14, 15)
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Specification