Contactless biometric authentication device, contactless biometric authentication system and contactless biometric authentication method

A contactless biometric authentication system comprising:

• an insertion chamber which includes an opening in one side and a space into which an authenticator's finger is inserted from the opening toward a far side of the insertion chamber;
• a shooting device which is installed at a position to capture the ventral side of the finger inserted into the insertion chamber;
• a first light source which is installed at a position on the far side of the shooting device in the insertion chamber and emits light toward the shooting device, the light being blocked by the inserted finger;
• a second light source which is provided at a higher position than a height at which the finger is inserted and emits light within a predetermined range including the shooting device when the light from the first light source is blocked by the finger, the light being absorbed by a blood vessel of the finger;
• and
• a reflection surface which is provided in the insertion chamber and receives and reflects the light from the second light source,
• wherein a position and direction of the reflection surface are adjusted to reflect the light from the second light source in a proportion corresponding to the height of the inserted finger when the light from the first light source is blocked by the finger, and
• the shooting device includes a contactless biometric authentication device which captures an image including the light reflected from the reflection surface and the ventral side of the inserted finger, and an information processing device which is communicably coupled to the contactless biometric authentication device,
• wherein the information processing device
• instructs the second light sources to emit light upon determining that the light from the first light source is blocked by a fingertip of the finger inserted into the insertion chamber,
• identifies a vein pattern of the inserted finger based on a region of the light of the second light source included in the image captured by the shooting device, and
• compares the identified vein pattern of the finger with a pre-registered vein pattern to perform authentication of the finger of the authenticator.

A contactless biometric authentication method comprising:

• providing an insertion chamber which includes an opening in one side and a space into which an authenticator's finger is inserted from the opening toward a far side of the insertion chamber;
• installing a shooting device at a position to capture the ventral side of the finger inserted into the insertion chamber;
• installing a first light source at a position on the far side of the shooting device in the insertion chamber, which emits light toward the shooting device, the light being blocked by the inserted finger;
• installing a second light source at a higher position than a height at which the finger is inserted, which emits light within a predetermined range, including the shooting device, when the light from the first light source is blocked by the finger, the light being absorbed by a blood vessel of the finger;
• installing a reflection surface in the insertion chamber, which receives and reflects the light from the second light source;
• adjusting a position and direction of the reflection surface to reflect the light from the second light source in a proportion corresponding to the height of the inserted finger when the light from the first light source is blocked by the finger;
• and
• with the shooting device, capturing an image including the light reflected from the reflection surface and the ventral side of the inserted finger.