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EP-3951699-B1 - PAPER SHEET SORTING DEVICE, WHITE REFERENCE DATA ADJUSTMENT METHOD, AND PROGRAM

EP3951699B1EP 3951699 B1EP3951699 B1EP 3951699B1EP-3951699-B1

Inventors

  • SEKI TORU
  • YUJI Kenta

Dates

Publication Date
20260506
Application Date
20200303

Claims (4)

  1. A paper sheet sorting device (100) comprising: a transport unit (101) that is configured to move a paper sheet along a transport path (4); a light emitting unit (4) that is configured to irradiate one surface of the paper sheet being moved with detection light; a plurality of light receiving units (Gb) that are placed at locations facing the other surface of the paper sheet being moved to receive the detection light having passed through the paper sheet and that are arranged along a width direction orthogonal to a moving direction of the paper sheet; an image data generating unit (104) that is configured to generate image data of tones corresponding to the detection light having entered the light receiving units (Gb); a white-reference-data storing unit (105) that is configured to store therein white reference data obtained by irradiating a white reference member (10) to be used for shading correction of the image data with the detection light; a movement restricting unit (7a, 7b) that is located at end parts in a width direction of the transport path (4) and that forms a right side wall (7a) and a left side wall (7b) of the transport path (4); an adjusting unit (109) that is configured to adjust the white reference data for shading correction of image data of the light receiving units (Gb) to a predetermined value on a condition that locations in the width direction of the light receiving units (Gb) are in a predetermined specific region (Ra, Rb); and an abutment unit that is provided between the light emitting unit (Ga) and the light receiving units (Gb) to abut on one surface or the other surface of the paper sheet and that is formed of a member transmitting light, wherein a location in the width direction of the abutment unit (8) is in the specific region (Ra, Rb), wherein the abutment unit comprises a right guide part (8R) and a left guide part (8L), which are provided on an upper tray (8) of the paper sheet sorting device (100), wherein the right guide part (8R) is plate-like and is erected along the right side wall (7a) of the transport path (4), wherein a lower end of the right guide part (8R) abuts on the vicinity of the right end of a banknote placed on a bottom surface of the transport path (4) and restricts movement of the banknote in an upper direction, and wherein the left guide part (8L) is plate-like and is erected along the left side wall (7a) of the transport path (4), wherein a lower end of the left guide part (8L) abuts on the vicinity of the left end of the banknote placed on the bottom surface of the transport path (4) and restricts movement of the banknote in an upper direction.
  2. The paper sheet sorting device (100) according to claim 1, wherein the specific region (Ra, Rb) is a region of which a distance in the width direction to the movement restricting unit (7a, 7b) is equal to or less than a predetermined distance.
  3. An adjustment method of white reference data that is used in a paper sheet sorting device (100) including: a transport unit (101) that moves a paper sheet along a transport path (4); a light emitting unit (Ga) that irradiates one surface of the paper sheet being moved with detection light; a plurality of light receiving units (Gb) that are placed at locations facing the other surface of the paper sheet being moved to receive the detection light having passed through the paper sheet and that are arranged along a width direction orthogonal to a moving direction of the paper sheet; an image data generating unit (104) that generates image data of tones corresponding to the detection light having entered the light receiving units (Gb); a movement restricting unit (7a, 7b) that is located at end parts in a width direction of the transport path (4) and that forms side walls of the transport path (4); and an abutment unit that is provided between the light emitting unit (Ga) and the light receiving units (Gb) to abut on one surface or the other surface of the paper sheet and that is formed of a member transmitting light, wherein a location in the width direction of the abutment unit (8) is in a predetermined specific region (Ra, Rb), wherein the abutment unit comprises a right guide part (8R) and a left guide part (8L), which are provided on an upper tray (8) of the paper sheet sorting device (100), wherein the right guide part (8R) is plate-like and is erected along the right side wall (7a) of the transport path (4), wherein a lower end of the right guide part (8R) abuts on the vicinity of the right end of a banknote placed on a bottom surface of the transport path (4) and restricts movement of the banknote in an upper direction, and wherein the left guide part (8L) is plate-like and is erected along the left side wall (7a) of the transport path (4), wherein a lower end of the left guide part (8L) abuts on the vicinity of the left end of the banknote placed on the bottom surface of the transport path (4) and restricts movement of the banknote in an upper direction, the method comprising a step of adjusting the white reference data for shading correction of the image data of the light receiving units (Gb) to a predetermined value on a condition that locations in the width direction of the light receiving units (Gb) are in the predetermined specific region (Ra, Rb).
  4. A program that causes a computer to adjust white reference data to be used in a paper sheet sorting device (100) including: a transport unit (101) that is configured to move a paper sheet along a transport path (4); a light emitting unit (Ga) that is configured to irradiate one surface of the paper sheet being moved with detection light; a plurality of light receiving units (Gb) that are placed at locations facing the other surface of the paper sheet being moved to receive the detection light having passed through the paper sheet and that are arranged along a width direction orthogonal to a moving direction of the paper sheet; an image data generating unit (104) that is configured to generate image data of tones corresponding to the detection light having entered the light receiving units (Gb); and a movement restricting unit that is located at end parts in a width direction of the transport path (4) and that forms side walls of the transport path (4); and an abutment unit that is provided between the light emitting unit (Ga) and the light receiving units (Gb) to abut on one surface or the other surface of the paper sheet and that is formed of a member transmitting light, wherein a location in the width direction of the abutment unit (8) is in a predetermined specific region (Ra, Rb), wherein the abutment unit comprises a right guide part (8R) and a left guide part (8L), which are provided on an upper tray (8) of the paper sheet sorting device (100), wherein the right guide part (8R) is plate-like and is erected along the right side wall (7a) of the transport path (4), wherein a lower end of the right guide part (8R) abuts on the vicinity of the right end of a banknote placed on a bottom surface of the transport path (4) and restricts movement of the banknote in an upper direction, and wherein the left guide part (8L) is plate-like and is erected along the left side wall (7a) of the transport path (4), wherein a lower end of the left guide part (8L) abuts on the vicinity of the left end of the banknote placed on the bottom surface of the transport path (4) and restricts movement of the banknote in an upper direction, the program causing the computer to function as an adjusting unit (109) that adjusts the white reference data for shading correction of the image data of the light receiving units (Gb) to a predetermined value on a condition that locations in the width direction of the light receiving units (Gb) are in the predetermined specific region (Ra, Rb).

Description

Field The present invention relates to a paper sheet sorting device, a white-reference-data adjustment method, and a program. Background Paper sheet sorting devices that receive a paper sheet inserted from an insertion port into a transport path and perform sorting processing by the authenticity, the denomination, or the like of the paper sheet are conventionally known. In these paper sheet sorting devices, an image of a paper sheet transported on the transport path is taken by an image sensor to generate image data indicating the paper sheet. This image data is used for authentication of the paper sheet and the like. For example, Patent Literature 1 discloses a paper sheet sorting device that includes an image sensor including a light emitting unit that irradiates one surface of a paper sheet on a transport path with detection light, and a light receiving unit on which the detection light having passed through the paper sheet to the other surface side is incident. In such a paper sheet sorting device, a technique of performing shading correction of an image generated by the image sensor is adopted in some cases. Patent Literature 2 discloses an image reading device comprising a reading section capable of reading images of a first surface and a second surface of an original, configured to acquire a signal to be acquired by reading a base material, and generate a first correction value to correct image data of the first surface and a second correction value to correct image data of the second surface on the basis of the signal. The image data read by the reading section is corrected using the generated first correction value and second correction value. Based on the signal, the first correction value is generated by acquiring a signal in a first area which corresponds to generation of the first correction value, and the second correction value is generated by acquiring a signal in a second area which corresponds to generation of the second correction value at a timing different from that in the first area. Patent Literature 3 discloses an image reader which is provided with a shading correction data acquisition means, and a plastic plate which emits luminescence by radiation of exciting light or a plate made of a ceramic phosphorescent material which emits light continuously for several tens of minutes after radiation of sunlight or the like for a certain period of time is used as a carrier for shading correction to read an image to obtain shading correction data for a luminescence image or shading correction data for a chemical luminescence image. Patent Literature 4 discloses an image reading apparatus including an illumination unit to irradiate a sheet that is conveyed by a conveyance unit with visible light and infrared light, an imaging unit to receive visible light and infrared light reflected from the sheet and to capture a visible image and an infrared image, and a background member including an infrared light low reflective part that is positioned within an imaging range of the imaging unit so as to overlap at least a side edge portion of the sheet and that diffusely reflects visible light and reflects infrared light at a lower reflectance than the sheet. Citation List Patent Literature Patent Literature 1: Japanese Patent Application Laid-open No. 2009-295125Patent Literature 2: Japanese Patent Application Laid-open No. 2016-208126Patent Literature 3: Japanese Patent Application Laid-open No. 2003-315944Patent Literature 4: United States Patent Application Laid-open No. 2014/063567 Summary Technical Problem White reference data used for shading correction is generated by a predetermined method. However, it is difficult to appropriately generate white reference data for correcting image data of pixels located in a predetermined specific region (for example, near side walls of the transport path) depending on methods for generating white reference data (for example, depending on shapes of a white reference member). In view of these circumstances, the present invention has an object to enable adjustment of white reference data of pixels located in the specific region described above. Solution to Problem The scope of the invention is defined by the appended claims. In order to achieve the above object, a paper sheet sorting device according to the present invention according to claim 1 includes a transport unit that moves a paper sheet along a transport path, a light emitting unit that irradiates one surface of the paper sheet being moved with detection light, a plurality of light receiving units that are placed at locations facing the other surface of the paper sheet being moved to receive the detection light having passed through the paper sheet and that are arranged along a width direction orthogonal to a moving direction of the paper sheet, an image data generating unit that generates image data of tones corresponding to the detection light having entered the light receiving units, a white-referenc