Patent ID: 9418276
Filing Date: 2016-08-16
CPC Classification: G06K

Claim Text:
1. A fingerprint authentication method comprising: acquiring, using a processor, an image that includes at least a part of a fingerprint; first detecting, using the processor, an orientation of a ridge that forms the fingerprint from the image; second detecting, using the processor, a singular point of the fingerprint from the image; calculating, using the processor, angles formed, on circumferences of a plurality of reference circles which concentric circles share the singular point as a center point, by the orientation of the ridge and the direction of a tangent line that comes into contact with the reference circle; creating, using the processor, narrow down data that is used to narrow down matching data that is used to match the fingerprint by associating the angle with positions on the circumferences of the plurality of reference circles; calculating, using the processor, a similarity from the narrow down data corresponding to the image and narrow down data corresponding to registration matching data registered by a computer; extracting, using the processor, the matching data from the registration matching data based on the similarity calculated at the calculating; weighting, using the processor, both of the narrow down data in accordance with radiuses of the concentric circles; and matching, using the processor, the image against the matching data extracted.