| 摘要 |
A biometric authentication apparatus includes a biometric information acquiring unit which captures an image of a first body part of a user carrying biometric information to generate a biometric image representing the biometric information, a storage unit which stores a reference table representing a relationship between the user's position relative to a predetermined reference position, a rotation angle of the biometric information and a template for registered biometric information of each registered user, and a processing unit. The processing unit determines a position of a second body part of the user different from the first body part on a position detection image in which an image of the second body part is captured to determine the user's position relative to the predetermined reference position, determines the rotation angle corresponding to the user's position with reference to the reference table, rotates the registered biometric information or the biometric information on the biometric image according to the rotation angle so as to make the direction of the registered biometric information substantially parallel to the direction of the biometric information on the biometric image, and compares the registered biometric information and the biometric information to each other, the direction of the registered biometric information and the direction of the biometric information having been made substantially parallel to each other. |
