COMBINED IRIS IMAGER AND WAVEFRONT SENSOR
First Claim
1. An iris imaging system for biometric identification, the system comprising an optical detector array positioned at an image plane of the iris imaging system, the detector array having a first and second regions, the first region receiving glint light reflected from a target eye and the second region receiving an image of the iris of the target eye;
- wherein the first region senses a wavefront of the glint light reflected from the target eye and the second region images the iris of the target eye.
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Abstract
An iris imaging system used for biometric identification provides a combined iris imager and wavefront sensor. The detector array allows for independent readout of different regions, such that a wavefront sensor region can be read out fast while allowing signal to integrate on the iris imaging region. Alternatively, the entire array may be used for wavefront sensing during an acquisition phase, and then at least a portion of the array may be switched to be used for iris imaging during a subsequent imaging phase. An optical periscope optionally allows various optics to be inserted in front of the combined iris imager and wavefront sensor. In another embodiment, the glint image of an on-axis or near on-axis illumination source is picked off at the image plane and directed to the wavefront sensor optics, while allowing all of the light from the iris field to pass through to the iris imaging camera.
102 Citations
17 Claims
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1. An iris imaging system for biometric identification, the system comprising an optical detector array positioned at an image plane of the iris imaging system, the detector array having a first and second regions, the first region receiving glint light reflected from a target eye and the second region receiving an image of the iris of the target eye;
- wherein the first region senses a wavefront of the glint light reflected from the target eye and the second region images the iris of the target eye.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of imaging an iris of an eye using an iris imaging system:
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sensing a wavefront of light reflected from the eye using substantially all of a detector array; establishing an initial tip-tilt and focus position for the iris imaging system based on the sensed wavefront; switching a majority of the detector array from wavefront sensing to iris imaging while maintaining a portion of the detector array for wavefront sensing; and imaging the iris with the majority of the detector array. - View Dependent Claims (9, 10, 11, 12)
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13. A method of imaging an iris of an eye using an iris imaging system:
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sensing a wavefront of light reflecting from the eye using substantially all of a detector array; performing tip-tilt and focus correction based on the sensed wavefront of the light reflection from the eye; switching substantially all of the detector array from wavefront sensing to iris imaging; and imaging the iris with substantially all of the detector array to obtain a first iris image. - View Dependent Claims (14)
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15. An iris imaging system for biometric identification, the system comprising:
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an illumination source providing a glint reflection occurring within a pupil of a target eye; a pickoff splitter placed near a focal plane of the iris imaging system, the pickoff splitter having a reflecting spot surrounded by a transparent surface, the reflecting spot reflecting the glint light, the transparent surface passing light reflected from the iris of the target eye; a wavefront sensor assembly for sensing the wavefront of the glint light reflected from the reflecting spot of the pickoff splitter; and an image sensor for imaging the iris of the target eye from the light reflected from the iris of the target eye and passed through the transparent surface of the pickoff splitter. - View Dependent Claims (16, 17)
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Specification