Patent ID: 7084415

Claim:
A fingerprint reading apparatus comprising: a first light source for emitting a detection beam having a first luminescent monochromatic color onto a fingerprint collation surface for receiving a finger tip; a second light source for emitting a detection beam having a second luminescent monochromatic color different from said first luminescent monochromatic color onto said fingerprint collation surface; an image pick up unit for acquiring images from said fingerprint collation surface; and a determination section for determining authenticity of a finger tip pressed against said fingerprint collation surface based on a difference between a first monochromatic image acquired from illumination of said fingerprint collation surface by said first luminescent monochromatic color and a second monochromatic image acquired from illumination of said fingerprint collation surface by said second luminescent monochromatic color, said determining authenticity in said determination section is carried out by comparing a predetermined threshold value with a difference between a differential contrast in said first monochromatic image and a differential contrast in said second monochromatic image.