METHOD OF FORMING FINGERPRING BIOMETRICAL CODE Russian patent published in 2010 - IPC G06K9/00 

FIELD: information technology.

SUBSTANCE: when processing an electronic image of a ridge pattern, the said image undergoes binarisation through filtration, joining false discontinuities on the image, removal of false lime merging and levelling pixels of the electronic image relative a given pixel intensity threshold, after which the skeleton of the binary electronic image is formed by thinning its lines to given thickness. After determination of munitia coordinates on the skeleton of the ridge pattern, their centre of mass is calculated. In order to define arguments of the biometrical code function, cores of the ridge pattern are isolated, for which distance from the centre of mass is calculated for each munitia. The core is the munitia with the shortest distance from the centre of mass. A tree is constructed from each core to the rest of the munitia. The length of the branches of each tree is calculated and the values are graded. Munitia concentration arguments are calculated and the values are used to form the biometrical code of the ridge pattern.

EFFECT: more reliable fingerprint biometrical code, reduced number of operations when comparing codes and formation of the code taking into account increase in probability of occurrence of false munitia moving from the centre of the fingerprint image.

9 cl, 9 dwg