Apparatus and method for detecting pupils
First Claim
1. An apparatus for pupil detection, said apparatus comprising:
- a first detector for receiving reflected light;
a first light source for emitting first light at a first illumination angle relative to the axis of said first detector;
a second light source for emitting second light at a second illumination angle relative to said axis, said second illumination angle greater than said first illumination angle, said first light and said second light having substantially equal intensity;
wherein pupils of a subject'"'"'s eyes are detectable using the difference between reflected first light and reflected second light received at said first detector; and
a plurality of additional light sources that are sequentially illuminated to measure pupil diameter.
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Accused Products
Abstract
Methods and apparatus for pupil detection are described. First light is emitted from a first light source at a first illumination angle relative to the axis of a detector. Second light is emitted from a second light source at a second illumination angle relative to the axis. The first light and the second light can have substantially equal intensities. The second illumination angle is greater than the first illumination angle. Reflected first light and reflected second light are received at the detector. The difference between the reflected first light and the reflected second light can be determined. The difference can be used to detect the pupils of a subject'"'"'s eyes.
66 Citations
51 Claims
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1. An apparatus for pupil detection, said apparatus comprising:
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a first detector for receiving reflected light; a first light source for emitting first light at a first illumination angle relative to the axis of said first detector; a second light source for emitting second light at a second illumination angle relative to said axis, said second illumination angle greater than said first illumination angle, said first light and said second light having substantially equal intensity; wherein pupils of a subject'"'"'s eyes are detectable using the difference between reflected first light and reflected second light received at said first detector; and a plurality of additional light sources that are sequentially illuminated to measure pupil diameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for pupil detection, said method comprising:
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emitting first light from a first light source at a first illumination angle relative to the axis of a detector; emitting second light from a second light source at a second illumination angle relative to said axis, said second illumination angle greater than said first illumination angle, said first light and said second light having substantially equal brightness; receiving reflected first light and reflected second light at said detector; determining the difference between said reflected first light and said reflected second light, wherein pupils of a subject'"'"'s eyes are detectable from said difference; receiving reflected light from a plurality of additional light sources that are sequentially illuminated; and determining pupil diameter using said reflected light. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. An apparatus for pupil detection, said apparatus comprising:
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a first detector for receiving reflected light; a first light source for emitting first light at a first illumination angle relative to the axis of said first detector; a second light source for emitting second light at a second illumination angle relative to said axis, said second illumination angle greater than said first illumination angle, said first light and said second light having substantially equal intensity; wherein pupils of a subject'"'"'s eyes are detectable using the difference between reflected first light and reflected second light received at said first detector; and a series of adjacent additional light sources that are positioned at different illumination angles and that are sequentially illuminated to measure pupil diameter, wherein measuring pupil diameter comprises comparing retinal return to the illumination angles of the light sources.
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51. A method for pupil detection, said method comprising:
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emitting first light from a first light source at a first illumination angle relative to the axis of a detector; emitting second light from a second light source at a second illumination angle relative to said axis, said second illumination angle greater than said first illumination angle, said first light and said second light having substantially equal brightness; receiving reflected first light and reflected second light at said detector; determining the difference between said reflected first light and said reflected second light, wherein pupils of a subject'"'"'s eyes are detectable from said difference; receiving reflected light from a series of adjacent additional light sources that are positioned at different illumination angles and that are sequentially illuminated; and determining pupil diameter using said reflected light, wherein determining pupil diameter using said reflected light comprises comparing retinal return to the illumination angles of the light sources.
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Specification