Small reliable image input apparatus incorporated in finger-prin

Details Small reliable image input apparatus incorporated in finger-prin Small reliable image input apparatus incorporated in finger-prin

1998-02-09

2000-01-04

Couso, Jose L.

Image analysis

Applications

Personnel identification

382124, G06K 900

Patent

active

060118601

ABSTRACT:
An image input device has a optical guide plate exposed to a window of a photo-shield case, a pair of light emitting diodes attached to side surfaces of the optical guide plate for radiating light into it, an area image sensor provided under the optical guide plate, a gradient index lens unit provided between the optical guide plate and the area image sensor and a filter connected to the area image sensor for eliminating a low frequency component from an image carrying signal; when a person presses a finger on the optical guide plate, the fingerprint scatters the light toward the gradient index lens unit, and the area image sensor produces the image carrying signal from the incident light; the reflection on valley lines is gradually varied along the width of the finger, and the elimination of the low frequency component makes the contrast of the image clear.

REFERENCES:
patent: 5073949 (1991-12-01), Takeda et al.
patent: 5621516 (1997-04-01), Shinzaki et al.
patent: 5650842 (1997-07-01), Maase et al.

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