Device for recognizing latent information

Details Device for recognizing latent information Device for recognizing latent information

1991-03-21

1993-06-08

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 2, 73644, 310335, G06K 900

Patent

active

052186440

ABSTRACT:
A device for recognizing latent information including an asymmetrical reading head in the form of a truncated cone which is inclined (oblique). The image of the latent information furnished by the reading head is deformed or "warped" with respect to the image which would be furnished by a perfectly symmetrical reading head (a right truncated cone). Hence, different categories of users of an installation can be provided with device having different reading heads furnishing each user with a proper image for the information he is permitted to access so as to prevent access to non-permitted information, each category of users having access to a part of the information corresponding to the specific image furnished by the proper reading head of his device.

REFERENCES:
patent: 3947128 (1976-03-01), Weinberger et al.
patent: 4120585 (1978-10-01), DePalma et al.
patent: 4414684 (1983-11-01), Blonder
patent: 4777958 (1988-10-01), Ophir
patent: 4972476 (1990-11-01), Nathans
patent: 4977601 (1990-12-01), Bicz
Follette et al., "Direct Optical Input System for Fingerprint Verification", IBM Technical Disclosure Bulletin, vol. 16, No. 11, Apr. 1974, pp. 3572-3573.

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