Patent ID: 9727773
Date: 2017-08-08
CPC Classifications: G06K

Claim:
1. A fingerprint core extraction device for fingerprint matching, comprising a main core extraction processor which generates a skeleton image based on a ridgeline shape within a fingerprint image and extracts a fingerprint core for aligning fingerprint positions when performing fingerprint matching of the fingerprint image based on the skeleton image, wherein: the main core extraction processor comprises a data processing controller; and a memory storing instructions that when executed by the data processing controller implement; a core extraction unit including an endpoint processing function which extracts bifurcations in the skeleton image and executes endpoint processing on each of the bifurcations to generate an endpoint image, and a skeleton image generation/extraction unit which executes generation processing of the skeleton image by changing a density inverted image formed by white-black inverting density colors of the endpoint image generated thereby into the skeletons; and the core extraction unit includes a core determination function which specifies a loop-like vertex pixel with a highest loop score value that shows a degree of bend in a skeleton shape of the density inverted image and determines it as the fingerprint core.