How is the similarity of two fingerprints determined based on minutia?
Successively recorded fingerprints are never identical, rather are at best highly ‘similar’ due to differences in finger position, application pressure, finger angle, dirtiness, and the physiological constitution of the user. The measure of similarity is given a score. The higher this score, the more similar the fingerprint, and vice versa. During the matching process in minutia based systems, one tries to minimize the influence of positioning and angle discrepancy, and incidentally size variations (in order to calculate out the effects of growth until around 18 years). The actual picture is adjusted and rotated with respect to the reference picture until the distance between minutia is minimized. The resulting similarity score, then depends on the following: • Number of minutia in agreement • Exactness of the positioning agreement • Degree of agreement of the minutia directions • Type of minutia agreement (line ending versus branching) • All values will be weighted with the picture qu
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- How is the similarity of two fingerprints determined based on minutia?
