| abstract |
(57) [Summary] PROBLEM TO BE SOLVED: To surely eliminate counterfeit paper sheets copied by a color copying machine or the like with an inexpensive configuration. SOLUTION: A paper sheet identification device 1 is constituted by an array of heat-sensitive elements so as to be smaller than the identification object on the surface of the paper sheet, and detects the height / depth of the unevenness of the identification object to generate electricity. A concavo-convex detecting unit 2 that converts the signal into a signal and outputs partial image data to be identified, an image storage unit 3 that stores the partial image data, and combines the partial image data stored in the image storage unit 3 An image construction unit 4 for constructing image data of the entire identification target, a feature extraction unit 5 for extracting a projection / recess pattern of the identification target based on the constructed image data, and the extracted projection / recess pattern previously obtained. A pattern comparing unit 6 for comparing with a reference pattern, and a determining unit 7 for determining whether the paper sheet is true or false or a paper sheet type based on the result of the pattern comparing unit 6 And |