Method of classifying fingerprints

Details Method of classifying fingerprints Method of classifying fingerprints

1975-07-25

1976-06-01

Martin, Jr., William D.

Geometrical instruments

Miscellaneous

Light direction

283 7, 3401463E, G06K 900

Patent

active

039598845

ABSTRACT:
A method for identifying fingerprints is disclosed; the method produces a descriptor code which is uniquely related to a given fingerprint impression. A fingerprint pattern is transformed into an informational model which represents the relative location of all data points with respect to selected groups of other data points. The method comprises the steps of transforming the fingerprint impression into a representation of a three-dimensional surface wherein the Z-axis coordinate has a value dependent upon the frequency of occurrence of ridge lines at a specific set of X-axis and Y-axis coordinates when the origin is taken at multiple positions over a prescribed part of the fingerprint impression, determining the values of local spatial derivatives, such as the surface curvature of a plurality of different areas of the three-dimensional surface, and concatenating the values in a predetermined order to construct a descriptor code for the fingerprint.

REFERENCES:
patent: 3292149 (1966-12-01), Bourne
patent: 3419287 (1968-12-01), Rudie
patent: 3558864 (1971-01-01), French
patent: 3560928 (1971-02-01), Berger et al.
patent: 3611290 (1971-10-01), Luisi
patent: 3893080 (1975-07-01), Ho

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