Identification device, identification method, and computer-readable medium including identification program

Abstract

An identification device includes, an imaging condition determinator configured to determine an imaging condition as to whether or not an optical change in the anti-counterfeit medium is imageable from an observation angle that is an angle of captured image data in an imaging direction with respect to a reference line on an observation object surface of the anti-counterfeit medium being designed such that an observed pattern of light varies as the observation angle varies, a similarity calculator configured to obtain similarity between the captured image data and correct image data generated from the optical change corresponding to the observation angle when it is determined that the optical change is imageable under the imaging condition; and an authenticity determinator configured to perform authenticity determination as to whether or not the anti-counterfeit medium is correct based on whether or not the similarity exceeds a preset similarity threshold.