Method of determining a pseudo-identity on the basis of...

G - Physics – 06 – K

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G06K 9/00 (2006.01)

Patent

CA 2735405

Additional information regarding a fingerprint is estimated, with a given level of confidence, on the basis of characteristics of a set of minutiae corresponding to this print. Local descriptors are determined around some at least of the minutiae, so that they comprise, in relation to zones comprising additional information estimated with the given confidence level, values calculated on the basis of said information and, in relation to zones not comprising such information, erasures. The local descriptors determined are quantized according to a given number of integer values, a value being reserved for erasures. The quantized local descriptors are coded with the aid of an error-tolerant coding algorithm associated with a decoding algorithm devised to take account of errors and erasures. And a pseudo-identity is determined on the basis of some at least of the coded quantized local descriptors.

On estime, avec un niveau de confiance donné, des informations supplémentaires sur une empreinte digitale à partir de caractéristiques d'un ensemble de minuties correspondant à cette empreinte. On détermine des descripteurs locaux autour de certaines au moins des minuties, de façon qu'ils comprennent, relativement à des zones comportant des informations supplémentaires estimées avec le niveau de confiance donné, des valeurs calculées à partir desdites informations et, relativement à des zones ne comportant pas de telles informations, des effacements. On quantifie les descripteurs locaux déterminés selon un nombre donné de valeurs entières, une valeur étant réservée aux effacements. On code les descripteurs locaux quantifiés à l'aide d'un algorithme de codage tolérant des erreurs et associé à un algorithme de décodage agencé pour tenir compte des erreurs et des effacements. Et on détermine une pseudo-identité à partir de certains au moins des descripteurs locaux quantifiés codés.

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