Method and apparatus for the identification of not-enrolled...

Details Method and apparatus for the identification of not-enrolled... Method and apparatus for the identification of not-enrolled...

G - Physics

06

K

G06K 9/20 (2006.01) G06K 9/00 (2006.01) G06K 9/60 (2006.01)

Patent

CA 2236048

For a better recognition of unrolled images of fingerprints, a picture is taken of the skin lines of two adjacent fingers (1, 2). The directions of both finger length axis (L1, L2) are determined according to an N standard direction and a guiding device (13) prevents fingers from rotating about their length axis, thereby allowing for a number of definite and substantially consistent partial images (B3, B4) of the completely unrolled fingerprint (A) to be captured and those images to be converted on the basis of assessment algorithms into a lowered data quantity, thus significantly improving recognition reliability, reducing the storage capacity needed and simplifying the assessment algorithms.

Pour mieux reconnaître des images non déroulées d'empreintes digitales, on photographie les lignes de la peau de deux doigts juxtaposés (1, 2). Les orientations des axes longitudinaux des doigts (L1, L2) sont déterminées par rapport à une direction normale N, et l'on utilise un mécanisme de guidage (13) pour éviter que les doigts ne tournent autour de leur axe longitudinal, en sorte que des quantités d'images partielles (B3, B4) définies et pratiquement concordantes de l'empreinte digitale (A) entièrement déroulée sont saisies et converties au moyen d'algorithmes d'évaluation en une quantité de données plus réduite. Cela permet d'accroître sensiblement la fiabilité de reconnaissance avec moins de mémoire et avec des algorithmes d'évaluation simplifiés.

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