Biometric authentication apparatus and biometric authentication method

A computer-implemented biometric authentication method comprising:

• displaying, on a screen of a display device, a guidance indicating a target area to be in contact with a part of a human body;
• detecting whether the part of the human body is in contact with the target area;
• when the part of the human body is in contact with the target area, determining a distance between an imaging device and another part of the human body in accordance with an image captured by the imaging device, the image including the other part of the human body;
• and
• changing a display position of the guidance in accordance with the determined distance,
• wherein the part of the human body is a plurality of fingers,
• the target area includes two areas to be in contact with respective two fingers, and
• the changing includes changing a distance between the two areas.

A non-transitory computer-readable medium storing a program that causes a biometric authentication apparatus to execute a process comprising:

• displaying, on a screen of a display device, a guidance indicating a target area to be in contact with a part of a human body;
• detecting whether the part of the human body is in contact with the target area;
• when the part of the human body is in contact with the target area, determining a distance between an imaging device and another part of the human body in accordance with an image captured by the imaging device, the image including the other part of the human body;
• and
• changing a display position of the guidance in accordance with the determined distance,
• wherein the part of the human body is a plurality of fingers,
• the target area includes two areas to be in contact with respective two fingers, and
• the change includes changing a distance between the two areas.