Fingerprint processing system capable of detecting a core of a f

Details Fingerprint processing system capable of detecting a core of a f Fingerprint processing system capable of detecting a core of a f

1989-04-24

1991-08-13

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 5, G06K 900

Patent

active

050402242

ABSTRACT:
In a fingerprint processing system for use in detecting a core position of a fingerprint image quantized into a plurality of picture elements, statistical processing is carried out in relation to parameters which are variable in dependency upon the core position and directions and curvatures of the picture elements preliminarily detected to specify ridges of the fingerprint image. The parameters may be existence probabilities of the core position that are determined for the directions and the curvatures. Such existence probabilities are successively calculated at each picture element and adjacent picture elements to be summed up and to detect a maximum one of the existence probabilities. A position which has the maximum existence probability is judged as the core position. Alternatively, the parameters may be differences between practical curvatures extracted from the fingerprint image and reference curvatures defining a reference curve. A minimum one of the differences is statistically detected with reference to various kinds of the reference curves. In addition, the directions and the curvatures of the picture elements may be determined by deriving the density levels of the picture elements along a plurality of arcuate lines specified by line directions and line curvatures.

REFERENCES:
patent: 4151512 (1979-04-01), Piganati et al.
patent: 4185270 (1980-01-01), Fischer et al.
patent: 4310827 (1982-01-01), Asai
patent: 4747147 (1988-05-01), Sparrow

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