Robert Boschgmbh

Jan Lichtermann

Mario Kroeninger

Jie Ge

Identification of a fingermark is performed by obtaining for a fingermark a fingermark image, storing reference fingermarks in a databank, comparing the obtained fingermark image with the reference fingermarks for identification, before the identification determining for each reference fingermark in comparison with the obtained fingermark image a similarity degree, sorting the reference fingermarks in the databank in accordance with the similarity degree, and performing the identification of the fingermark beginning with the reference fingermark which leads to the greatest similarity degree.

Method of and device for identification of fingermarks

A method for determining reference points in a fingerprint image is used for determining similarity values using a determination of orientation patterns and a comparison with reference orientation patterns, in which the similarity values are compared with a first threshold value to determine whether a reference point is identified or not. Whorl, delta or core points are identified as core points. Both a linear and a nonlinear reference orientation pattern are used for core points. The orientation pattern for an image area is converted into a vector field for comparison with the reference orientation patterns. A scattering is computed from the spectral power density, which is determined for computation of orientation patterns, and severely distorted image areas are thereby eliminated from the determination of reference points.

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Vaihingen-Ensingen, Germany

Jan Lichtermann