Patent ID: 8611614

Claim:
A personal authentication device comprising: an image acquisition unit including a lens array composed of two or more lenses and an image taking unit that takes as a compound eye image a set of images of a living body held at the lens array, the images being formed through the lenses of the lens array; a shift estimation unit that estimates an image shift amount between ommatidium images of the compound eye image acquired by the image acquisition unit; an image restructuring unit that restructures a single image from the plural ommatidium images of the compound eye image acquired by the image acquisition unit using the image shift amount of the compound eye image estimated by the shift estimation unit; a registration pattern storage unit that correspondingly stores a registration pattern and the image shift amount, the registration pattern being the single image which is restructured by the image restructuring unit, or a characteristic-amount vector which is extracted from the single image at authentication, the image shift amount being estimated by the shift estimation unit at the authentication; a size correction unit that corrects a size of the single image, which is restructured by one of the image restructuring unit and the characteristic-amount vector, using a magnification ratio which is determined based on the image shift amount, which is read from the registration pattern storage unit, and the image shift amount which is estimated by the shift estimation unit; and an authentication processing unit that verifies the single image of which the size is corrected by the size correction unit or a characteristic-amount vector extracted from the single image against the registration pattern read from the registration pattern storage unit.