Biometric authentication system

A biometric authentication system, which is configured to execute authentication by using registered biometric information that is registered, the biometric authentication system comprising:

• a light source unit, which is provided above a living body, and is configured to irradiate the living body with light;
• an image pickup unit, which is provided below the living body, and is configured to photograph a vessel image with light radiated from the light source unit and transmitted through the living body;
• a control unit configured to generate authentication biometric information from the vessel image photographed by the image pickup unit;
• a category selection unit configured to select a category that corresponds to the authentication biometric information, based on supplementary information including information that has been obtained about a position and posture of the living body at timing of photographing the vessel image, wherein the supplementary information further includes contrast value information indicating the sharpness of the authentication biometric information;
• and
• an authentication unit configured to execute authentication processing by comparing registered biometric information of the selected category and the authentication biometric information.

A biometric authentication system, which is configured to execute authentication by using registered biometric information that is registered, the biometric authentication system comprising:

• an image pickup unit configured to photograph an image with light reflected by a living body;
• a control unit configured to generate authentication biometric information from the image photographed by the image pickup unit;
• a category selection unit configured to select a category that corresponds to the authentication biometric information, based on supplementary information including background information that is extracted from an area of the photographed image outside the living body, wherein the supplementary information further includes contrast value information indicating the sharpness of the authentication biometric information;
• and
• an authentication unit configured to execute authentication processing by comparing registered biometric information of the selected category and the authentication biometric information.