System and method for tracking the point of gaze of an observer
First Claim
Patent Images
1. A system for tracking a point of gaze of an observer observing an object, wherein the system comprises:
- a device for recording an image of an eye of the observer;
a light source configured to provide a luminous marker on or associated with the observed object, said marker being selectively movable within a field of view of the observer; and
a control unit comprising a first image analyzer configured to analyze the image recorded by the image recording device, said first image analyzer being configured to determine, from the image, a corneal reflection of the marker on the eye of the observer and a center of a pupil of the eye of the observer,wherein the system for tracking further comprises;
said first image analyzer being configured to determine relative positions of the corneal reflection of the marker and the pupil center;
said control unit comprising a second analyzer configured to receive the determined relative positions of the corneal reflection of the marker and the pupil center, and configured to generate data for repositioning the marker in order to lessen a difference between the determined relative positions of the corneal reflection of the marker and the pupil, until the position of the corneal reflection of the marker and the position of the pupil substantially coincide; and
means for repositioning the marker in response to the repositioning data.
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Abstract
A system for tracking the point of gaze of an observer observing an object comprises a camera for recording an image of an eye of the observer, comprises a means for providing a luminous marker, and means for analyzing the image of the eye to determine the reflection of the marker on the eye and the centre of the pupil. The relative positions of the corneal reflection of the marker and the pupil centre are measured. The marker is repositioned, in dependence on the determined relative positions, to improve correspondence between the corneal reflection of the marker and the pupil center.
64 Citations
18 Claims
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1. A system for tracking a point of gaze of an observer observing an object, wherein the system comprises:
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a device for recording an image of an eye of the observer; a light source configured to provide a luminous marker on or associated with the observed object, said marker being selectively movable within a field of view of the observer; and a control unit comprising a first image analyzer configured to analyze the image recorded by the image recording device, said first image analyzer being configured to determine, from the image, a corneal reflection of the marker on the eye of the observer and a center of a pupil of the eye of the observer, wherein the system for tracking further comprises; said first image analyzer being configured to determine relative positions of the corneal reflection of the marker and the pupil center; said control unit comprising a second analyzer configured to receive the determined relative positions of the corneal reflection of the marker and the pupil center, and configured to generate data for repositioning the marker in order to lessen a difference between the determined relative positions of the corneal reflection of the marker and the pupil, until the position of the corneal reflection of the marker and the position of the pupil substantially coincide; and means for repositioning the marker in response to the repositioning data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for tracking the point of gaze of an observer observing an object, wherein the method comprises:
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recording an image of an eye of the observer; providing a luminous marker on or associated with the observed object, said marker being selectively movable within a field of view of the observer; and analyzing the image recorded by the image recording device in order to determine, from the image, a corneal reflection of the marker and a center of a pupil of the eye of the observer, wherein the method further comprises; determining relative positions of the corneal reflection of a marker and the pupil center; generating data for repositioning the marker in order to lessen a difference between the determined relative positions of the corneal reflection of the marker and the pupil; and repositioning the marker in response to the repositioning data. - View Dependent Claims (17, 18)
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Specification