A fingerprint sensor acquires fingerprint information of an object being in contact. A light source irradiates a light to the object from a lateral side of the fingerprint sensor. A measuring unit measures a diffusion pattern of the light passing through the object. A determining unit determines whether...http://www.google.com/patents/US7783088?utm_source=gb-gplus-sharePatent US7783088 - Fingerprint authenticating apparatus, live-finger determining apparatus, and live-finger determining method
