Personal identification device and method

摘要

A personal identification device prevents the reduction in the finger vein recognition rate which otherwise occur due to erroneous insertion of a finger (1) by a user not accustomed to operation or insertion of a false finger (1) at low cost. The device includes an image pickup unit (2), a light source (3) for emitting light adapted to be transmitted through the finger (1) and incident on said image pickup unit (2), and an image operating unit (11) for generating a vein pattern from the image picked up by said image pickup unit (2). The device may further include a display (15) for displaying a guide (61; 64) together with the generated vein pattern to allow setting the finger (1) to a registration position. Alternatively, the personal identification device may be arranged to control the light power of said light source (3) based on the brightness of the image. Finally, the processing unit (11) may be adapted to determine whether the finger (1) is that of an organism or not by evaluating the fluctuation of the power of light received by a light-sensitive element (50) from another light source (51) in a fingertip guide unit (4).