The present invention relates to a technique for checking if the reflected
image of a light emitting diode for lighting is detected in the image of
an iris and determining whether the iris is a living one in order to
prevent an illegal intrusion using a simulacrum such as a photograph or
dynamic image. The object of the present invention is achieved by a first
step of imaging an eye of the user when the user approaches the field of
view, processing the image signal, and capturing the image of the iris and
pupil, a second step of selectively lighting LEDs for lighting installed
on the both sides of a camera while imaging the eye of the user and
detecting the reflected image of a corresponding LED in the image of the
iris and pupil, a third step of determining that the iris is a
falsification and informing the system of the fact if the reflect image of
a the corresponding light emitting diode is not detected in the above
steps, and determining that the iris is really recognized if detected, and
a fourth step of performing a recognition of an iris image signal using a
database if the iris is proven to be really recognized and determining
whether the image is data registered in the database.
