DEVICE/METHOD FOR DETECTING ILLEGALITY AND COMPUTER- READABLE RECORDING MEDIUM WITH PROGRAM FOR MAKING COMPUTER PERFORM THE METHOD RECORDED THEREON

摘要

PROBLEM TO BE SOLVED: To provide a device/method for detecting illegality and a recording medium and a recording medium capable of coping with illegality using residual fingerprints efficiently without changing hardware. SOLUTION: Picture data 1 is obtained in a state where an inner light source 12 is off under the control of a control part 16 and the light source 12 is turned on to obtain picture data 2 after then. Then, a discrimination part 18 discriminates the presence/no-presence of illegality based on the brightness difference between the data 1 and the data 2.