Method and apparatus for fingerprint verification
First Claim
1. An optical processor fingerprint verification apparatus comprising:
- (a) a source of incoherent light for providing an illuminating beam along a beam path;
(b) input means including means to receive at least one fingerprint or fingerprint recording of an individual located in said beam path for producing an optical information beam modulated with data from said at least one fingerprint or fingerprint recording along an optical information beam path;
(c) optical Fourier transform means in said optical information beam path for providing a Fourier transformed optical information beam in a transform plane;
(d) supporting means for supporting a reference data record including a pre-recorded reflection hologram of at least one reference fingerprint in said transform plane, said pre-recorded reflection hologram for reflecting and filtering a Fourier transformed optical information beam to provide light having an intensity distribution representing the correlation between said pre-recorded reflection hologram and said Fourier transformed optical information beam; and
(e) verification indicating means responsive to the intensity distribution of light reflected from said pre-recorded reflection hologram when said pre-recorded reflection hologram is illuminated by a Fourier transformed optical information beam.
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Accused Products
Abstract
The invention relates to an optical processing fingerprint verification device. A light source illuminates a prism upon which the user has placed two fingers to that light reflected from the prism is modulated by the data of the users fingerprints. The fingerprint data beam passes through a lens and undergoes a Fourier transform at a card including a reflection hologram matched to two fingerprints of a reference individual. The intensity distribution of the ligh reflected from the hologram determines whether a match exists. Use of a reflection hologram allows use of an incoherent light source. The two fingers are located on the prism by movable guides positioned by information on the card as to the relative length and the width of the two fingers of the reference individual. This provides a second level of verification. Scaling sensitivity may be reduced by utilizing a frequency multiplexed hologram.
66 Citations
11 Claims
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1. An optical processor fingerprint verification apparatus comprising:
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(a) a source of incoherent light for providing an illuminating beam along a beam path; (b) input means including means to receive at least one fingerprint or fingerprint recording of an individual located in said beam path for producing an optical information beam modulated with data from said at least one fingerprint or fingerprint recording along an optical information beam path; (c) optical Fourier transform means in said optical information beam path for providing a Fourier transformed optical information beam in a transform plane; (d) supporting means for supporting a reference data record including a pre-recorded reflection hologram of at least one reference fingerprint in said transform plane, said pre-recorded reflection hologram for reflecting and filtering a Fourier transformed optical information beam to provide light having an intensity distribution representing the correlation between said pre-recorded reflection hologram and said Fourier transformed optical information beam; and (e) verification indicating means responsive to the intensity distribution of light reflected from said pre-recorded reflection hologram when said pre-recorded reflection hologram is illuminated by a Fourier transformed optical information beam. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9)
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7. A method of fingerprint verification comprising:
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(a) illuminating an input means upon which at least one fingerprint has been placed with a beam of incoherent light whereupon incidence of said beam on said at least one fingerprint causes a fingerprint data beam to be produced; (b) passing said fingerprint data beam through an optical Fourier transform means; (c) filtering the Fourier transform of said fingerprint data beam with a pre-recorded reflection hologram of a Fourier transform of at least one reference fingerprint to provide reflected light having an intensity distribution representing the correlation between said Fourier transform of said fingerprint beam and said pre-recorded reflection hologram; (d) indicating a match or a mismatch between said at least one fingerprint and said at least one reference fingerprint in response to the intensity distribution of light reflected from said reflection hologram. - View Dependent Claims (10, 11)
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Specification