Method and apparatus for fingerprint verification

Details Method and apparatus for fingerprint verification Method and apparatus for fingerprint verification

G - Physics

06

K

41/1, 354/58, 88

G06K 9/00 (2006.01) A61B 5/117 (2006.01) G06K 9/76 (2006.01) G07C 9/00 (2006.01)

Patent

CA 1291572

ABSTRACT OF THE DISCLOSURE The invention relates to an optical processing finger- print verification device. A light source illuminates a prism upon which the user has placed two fingers so 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 inten- sity distribution of the light reflected from the hologram deter- mines 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 verifica- tion. Scaling sensitivity may be reduced by utilising a frequency multiplexed hologram.

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