Abstract

A holographic fingerprint sensor has been developed for a system that identifies a person by his or her fingerprints. The sensor uses a laser as its light source and consists of a light-conducting plate, which is a transparent glass plate with a plain grating-type hologram, and a focusing lens system just under the hologram. Since the sensor uses a plane-parallel plate, all the optical paths from each point of a fingerprint to the hologram are equal, and a bright fingerprint can be created without the trapezoidal distortion that is inherent in conventional prism-type sensors.

© 1992 Optical Society of America

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References

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  1. M. Kawagoe, A. Tojo, “Fingerprint pattern classification,” Pattern Recognition 17, 295–303 (1984).
    [CrossRef]
  2. A. Shimisu, M. Hase, “Entry method of fingerprint image using a prism,” Trans. Inst. Electron. Commum. Eng. Jpn. J67-D, 627–628 (1984).

1984

M. Kawagoe, A. Tojo, “Fingerprint pattern classification,” Pattern Recognition 17, 295–303 (1984).
[CrossRef]

A. Shimisu, M. Hase, “Entry method of fingerprint image using a prism,” Trans. Inst. Electron. Commum. Eng. Jpn. J67-D, 627–628 (1984).

Hase, M.

A. Shimisu, M. Hase, “Entry method of fingerprint image using a prism,” Trans. Inst. Electron. Commum. Eng. Jpn. J67-D, 627–628 (1984).

Kawagoe, M.

M. Kawagoe, A. Tojo, “Fingerprint pattern classification,” Pattern Recognition 17, 295–303 (1984).
[CrossRef]

Shimisu, A.

A. Shimisu, M. Hase, “Entry method of fingerprint image using a prism,” Trans. Inst. Electron. Commum. Eng. Jpn. J67-D, 627–628 (1984).

Tojo, A.

M. Kawagoe, A. Tojo, “Fingerprint pattern classification,” Pattern Recognition 17, 295–303 (1984).
[CrossRef]

Pattern Recognition

M. Kawagoe, A. Tojo, “Fingerprint pattern classification,” Pattern Recognition 17, 295–303 (1984).
[CrossRef]

Trans. Inst. Electron. Commum. Eng. Jpn.

A. Shimisu, M. Hase, “Entry method of fingerprint image using a prism,” Trans. Inst. Electron. Commum. Eng. Jpn. J67-D, 627–628 (1984).

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Figures (20)

Fig. 1
Fig. 1

Principle of the prism-type fingerprint sensor.

Fig. 2
Fig. 2

Variation of the prism-type fingerprint sensor.

Fig. 3
Fig. 3

Principle of the holographic fingerprint sensor.

Fig. 4
Fig. 4

Model with fiat glass plate.

Fig. 5
Fig. 5

Relation between the relative intensity and the scattering angle.

Fig. 6
Fig. 6

Relation between the outgoing position and the scattering angle.

Fig. 7
Fig. 7

Angle of incidence for hologram construction.

Fig. 8
Fig. 8

Hologram reconstruction.

Fig. 9
Fig. 9

Relation between the hologram construction angle and the wavelength ratio: Ng, 1.54; Nh, 1.60.

Fig. 10
Fig. 10

Astigmatism generation mechanism: (a) reconstruction (front view); (b) reconstruction of a plane grating by a divergent spherical wave (solid figure).

Fig. 11
Fig. 11

Principle of astigmatism correction by the orthogonal cylindrical lens method.

Fig. 12
Fig. 12

Improved resolution by using a spatial filter: (a) blurred image; (b) effect of the spatial filter.

Fig. 13
Fig. 13

Detected image of a fingerprint.

Fig. 14
Fig. 14

Relation between contrast and lighting angle from inside a flat glass plate: (a) experimental system; (b) experimental data.

Fig. 15
Fig. 15

Removal of influence of a latent fingerprint by optimizing the lighting angle.

Fig. 16
Fig. 16

Ridge-selective lighting method: (a) problem of direct lighting method; (b) lighting using total internal reflection light.

Fig. 17
Fig. 17

Relation between the signal light S/N ratio and illuminating and information light crossing angle.

Fig. 18
Fig. 18

Trial fingerprint sensor unit.

Fig. 19
Fig. 19

Practical optical system of a holographic fingerprint sensor.

Fig. 20
Fig. 20

Detected image of a fingerprint.

Equations (11)

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L = ( m + 1 ) t tan ϕ .
I o I i = k m cos ϕ [ exp - α ( m + 1 ) cos ϕ ] .
t _ W 2 tan ϕ .
ϕ = 45 ° ,             m = 2 ,             t = 10 mm .
θ 3 g > 42 ° .
θ 3 g = 45 ° .
θ 3 g = 45 ° ,             θ 4 = 0 ° .
θ 1 = 14.1 ° ,             θ 2 = 54.3 ° .
f = 1286 lines / mm ,             δ = 21.0 ° .
d z = ( a 1 + b 1 ) - ( a 2 + b 2 ) .
d z = f 1 ( M 1 + 1 ) 2 M 1 - f 2 ( M 2 + 1 ) 2 M 2 .

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