Importance

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Abstract

In a method for checking fingerprints, reference partial areas are compared with slightly larger current partial areas in different relative positions. The comparison between a reference partial area and a current partial area begins with the reference partial area centered in relation to the current partial area. Thereafter, the reference partial area is moved in stages in a spiral shape out towards the edges of the current partial area. As soon as a relative is found for which a predetermined requirement of likeness is satisfied, the reference partial area is considered to match the current partial area and the comparison is interrupted. As soon as a predetermined number of matching reference partial areas have been found, the checked fingerprint is approved and the check is terminated. The check can be carried out in two phases with different sizes of reference partial areas. The method has the advantage of being so rapid that it can be carried out on a JAVA smart card in reasonable time. A device and a computer program are also disclosed.

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First Claim