Iris imaging using reflection from the eye
First Claim
Patent Images
1. An iris imaging system comprising an imaging subsystem, the imaging subsystem comprising:
- a camera for capturing images of irises with sufficient resolution for biometric identification;
a light source for producing light to illuminate eyes; and
a fine tracking system comprising an adaptive optics loop including;
a deformable mirror for adjusting a wavefront of an eye reflection of the light illuminating the eyes;
a wavefront sensor for sensing the wavefront of the eye reflected light; and
a controller coupled between the deformable mirror and the wavefront sensor, for adjusting the deformable mirror based on the sensed wavefront to steer a field of view of the camera to the eyes,wherein the fine tracking system can track irises to better than 0.5 cm accuracy.
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Abstract
A rapid iris acquisition, tracking, and imaging system can be used at longer standoff distances and over larger capture volumes, without the active cooperation of subjects. The captured iris images can be used for biometric identification. Light illuminates the subjects'"'"' eyes. Eye reflection from the eyes is used to steer a high resolution camera to the eyes in order to capture images of the irises.
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Citations
65 Claims
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1. An iris imaging system comprising an imaging subsystem, the imaging subsystem comprising:
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a camera for capturing images of irises with sufficient resolution for biometric identification; a light source for producing light to illuminate eyes; and a fine tracking system comprising an adaptive optics loop including; a deformable mirror for adjusting a wavefront of an eye reflection of the light illuminating the eyes; a wavefront sensor for sensing the wavefront of the eye reflected light; and a controller coupled between the deformable mirror and the wavefront sensor, for adjusting the deformable mirror based on the sensed wavefront to steer a field of view of the camera to the eyes, wherein the fine tracking system can track irises to better than 0.5 cm accuracy. - 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, 42)
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27. An iris imaging system comprising an imaging subsystem, the imaging subsystem comprising:
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a camera for capturing images of irises with sufficient resolution for biometric identification; a light source for producing light to illuminate eyes; and a fine tracking system comprising an adaptive optics loop for steering a field of view of the camera to the eyes and also for focusing the camera on the irises, based on an eye reflection of the light illuminating the eyes, wherein the fine tracking system can track irises to better than 0.5 cm accuracy. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A method for imaging an iris of and eye, comprising:
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illuminating the eye with light; sensing a wavefront of an eye reflection from the eye; steering a field of view of a camera to the eye and focusing the camera on an iris of the eye, based on the wavefront of the eye-reflected light; and the camera capturing an image of the iris with at least 200 micron resolution for biometric identification. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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Specification