Paper sheet processing apparatus

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 processor which is capable of controlling the light emitting part and the light receiving part;
• and
• a storage part which is connected to the processor,
• wherein the processor is operative to:
• digitize the transmitted light and the reflected light which are received by the light receiving part based on respective brightness per each pixel of a predetermined size as a unit as color information having the respective brightness is included, and allow the storage part to store such digitized data in association with a location of each pixel in the images;
• determine whether the reflected light and the transmitted light at each pixel location are in a predetermined relationship;
• when the reflected light and the transmitted light at a pixel location are in a predetermined relationship, control the storage part to store a marker to indicate not to use pixel data at the pixel location;
• judge an authenticity of the paper sheet based on each pixel data stored by the storage part, excluding the pixel data at the pixel location with which the marker is associated.

A method of judging an authenticity by analyzing images by reflected light and transmitted light from a paper sheet to which light is irradiated, comprising the steps of:

• irradiating the paper sheet with a light emitter;
• acquiring transmitted light with location information thereof in the paper sheet with a light receiver;
• acquiring reflected light with location information thereof in the paper sheet with the light receiver;
• judging whether a state change occurs in a predetermined area based on the transmitted light and the reflected light of the predetermined area having been located at a predetermined position with a controller;
• and
• excluding the predetermined area for the authenticity judgment when the state change is occurred and including the predetermined area for the authenticity judgment when the state change is not occurred, with the controller.