Patent ID: 9305209
Filing Date: 2016-04-05
CPC Classification: G06K

Claim Text:
1. A biometric authentication apparatus comprising: a storage unit which stores first shape data representing a shape of biometric information of a hand of a registered user in a state in which fingers of the hand take a first posture, a first index representing the first posture, second shape data representing a shape of biometric information of the hand of the registered user in a state in which the fingers of the hand take a second posture, and a second index representing the second posture; a biometric information acquisition unit which generates a biometric image representing biometric information of a hand of a user; a posture specification unit which calculates a third index representing a third posture of fingers of the hand of the user captured in the biometric image from the biometric image; a biometric information extraction unit which generates third shape data representing a shape of the biometric information of the hand of the user captured in the biometric image based on the biometric image; a correction unit which obtains corrected shape data by correcting the first shape data or the second shape data to cancel a shape difference of the biometric information due to a difference between the third posture and the first posture or the second posture according to a ratio of a difference between the third index and the first index or the second index to a difference between the first index and the second index; and a matching unit which matches the third shape data and the corrected shape data.