Patent ID: 8965099
Filing Date: 2015-02-24
Classification: G07D

Abstract:
1. A paper sheet recognition apparatus that recognizes a paper sheet having a motion thread in a thread part of which a pattern varies with a viewing angle, the paper sheet recognition apparatus comprising: a first light source that irradiates the paper sheet with a light from a first direction; a second light source that irradiates the paper sheet with a light from a second direction that is different from the first direction; a light source controller that controls the first light source and the second light source so that the paper sheet is irradiated with the light from the first direction or the second direction; a transport mechanism that transports the paper sheet; a line sensor that receives a reflected light reflected from the paper sheet that is being transported by the transport mechanism and that is irradiated with the lights from the first direction and the second direction; an image processing unit that creates, based on an output signal outputted from the line sensor, a first image captured by using the first light source and a second image captured by using the second light source; and a recognition unit that judges that the paper sheet has the motion thread if a first thread image, which is an image of the thread part included in the first image, and a second thread image, which is an image of the thread part included in the second image, are different and if an image obtained by shifting the first thread image by a predetermined distance in a predetermined direction, based on a visual relation between the first direction and the second direction from which the lights are irradiated towards the paper sheet, matches with the second thread image.