Collation of a streaked pattern at a high speed

Details Collation of a streaked pattern at a high speed Collation of a streaked pattern at a high speed

1991-05-30

1993-01-05

Goldstein, Herbert

Image analysis

Histogram processing

For setting a threshold

382 5, G06K 900

Patent

active

051777924

ABSTRACT:
On collating an input streaked pattern (fingerprint) with a reference streaked pattern, a local streak direction is extracted from a local area defined in the input streaked pattern by one of reference feature positions of reference feature points of the reference streaked pattern. Direction coincidence or non-coincidence is checked by comparing the extracted streak direction with a reference streak direction at the above-mentioned one reference feature position. If direction coincident, the presence or absence of one of the input feature points of the input streaked pattern is confirmed in the local area. If present, pattern coincidence is judged when a count of the input feature points reaches a threshold value. If the value is not reached, collation repeat and pattern non-coincidence is judged when all reference feature positions and streak directions are not yet or already used in extraction and subsequent check, respectively. If direction non-coincident, if absent, or if the collation should be repeated, extraction and check are continued by using different reference feature positions and streak directions. Preferably, the above-mentioned one reference feature position is used together with a position of an adjacent reference point and additionally with the number of reference streaks between the reference feature point and the adjacent reference feature point.

REFERENCES:
patent: 4310827 (1982-01-01), Asai
patent: 4944021 (1990-07-01), Hoshino et al.
patent: 5040223 (1991-08-01), Kamiya et al.

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