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; and
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.
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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.
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Citations
54 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; and
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. - 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, 39)
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40. 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; and
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. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. An apparatus for pupil detection, said apparatus comprising:
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a detector for receiving light reflected from a subject;
a light source for emitting light substantially along the axis of said detector; and
a controller coupled to said detector, wherein said controller identifies eyes of said subject by comparing features of an image generated by said detector against a feature that is characteristic of a region containing said eyes, wherein pupils of said eyes are detectable as relatively bright spots within said region. - View Dependent Claims (53, 54)
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Specification