Patent ID: 8522949

Claim:
A paper sheet processing apparatus comprising: a light emitting part which irradiates a paper sheet with light; a light receiving part which receives transmitted light through the paper sheet and reflected light from the paper sheet, the paper sheet being irradiated by the light emitting part; a converter which converts the transmitted light and reflected light received by the light receiving part into data including color information having brightness per pixel of a predetermined size as a unit; a storage part which stores a transmitted light image constituted of a plurality of pixels converted by the converter from the transmitted light received by the light receiving part, a reflected light image constituted of a plurality of pixels converted by the converter from the reflected light received by the light receiving part, and a reference data for authenticity judgment; a determining part which determines whether a predetermined area has a state change based on a comparison result between brightness of pixels in the predetermined area of the transmitted image and brightness of pixels of the reflected image corresponding to the predetermined area of the transmitted image; and a comparison judgment part which compares an image data of the paper sheet with the reference data in order to judge authenticity of the paper sheet, wherein when the predetermined area has no state change, an image data of the predetermined area is included in the image data of the paper sheet and when the predetermined area has the state change, the image data of the predetermined area is excluded from the image data of the paper sheet.