WO2017222365A1 - Procédé de test de qualité de billet de banque et dispositif de test de qualité de billet de banque - Google Patents

Procédé de test de qualité de billet de banque et dispositif de test de qualité de billet de banque Download PDF

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Publication number
WO2017222365A1
WO2017222365A1 PCT/NL2016/050440 NL2016050440W WO2017222365A1 WO 2017222365 A1 WO2017222365 A1 WO 2017222365A1 NL 2016050440 W NL2016050440 W NL 2016050440W WO 2017222365 A1 WO2017222365 A1 WO 2017222365A1
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WO
WIPO (PCT)
Prior art keywords
banknote
angle
light
incidence
light source
Prior art date
Application number
PCT/NL2016/050440
Other languages
English (en)
Inventor
Thomas Buitelaar
Original Assignee
Thomas Buitelaar
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomas Buitelaar filed Critical Thomas Buitelaar
Priority to PCT/NL2016/050440 priority Critical patent/WO2017222365A1/fr
Publication of WO2017222365A1 publication Critical patent/WO2017222365A1/fr

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
    • G07D7/187—Detecting defacement or contamination, e.g. dirt

Definitions

  • the invention relates to a method for testing banknote quality.
  • banknotes After production and commissioning of banknotes, they are subjected to wear, either when they are stored in for instance a wallet or a pocket, or when they are used or transferred, in which case the banknote will get in touch with human hands. It is important to assess the quality of a banknote from time to time in order to determine if the banknote still complies with the required standards, in which case it should be recirculated, or if it should be rejected, in which case it may be destroyed.
  • banknotes have a paper substrate.
  • contaminations are easily detected by various methods, such as measurement of the reflection of the banknote and the color of the light reflected.
  • contamination will result in a decrease of reflection and, since blue light will be absorbed to a higher extent compared to red or yellow light, the reflected light will be more reddish or yellowish.
  • the ink used for printing polymer banknotes has a much higher tendency to set off from the substrate over time compared to paper-based banknotes, which may lead to an increase of reflection after use, instead of a decrease of reflection as seen in paper-based banknotes.
  • the light reflecting from is a banknote is captured at least twice with a difference in at least one of angle of incidence or angle of detection.
  • a two-dimensional image would be obtained from the banknote.
  • Creases will result in shadows in the image, which will change in orientation and size based on the angle of incidence and angle of detection.
  • LEDs are an example of suitable light sources, since they can be switched on and off very rapidly.
  • angles of incidence and the angles of detection are within the same plane, which plane is
  • the pattern of the shadows resulting from the creases will be different. It is easier to correlate two captures when the angles of incidence and the angles of detection are within the same plane which is perpendicular to the one face of the banknote, and more preferably parallel to the longitudinal direction of the banknote.
  • the detector comprises a camera, directed towards the one side of the banknote, which camera is at a fixed position during the first and second analysis step, wherein the angle of incidence is smaller than 90 degrees in the first analysis step and larger than 90 degrees in the second analysis step.
  • Two images are made in which the light originates from an angle or incidence is smaller and larger than 90 degrees (i.e. opposing sides of the camera), preferably at the same angle of incidence with reference to the normal to the banknote.
  • the shadows resulting from the creases in the banknote will be in different directions, which makes it possible to assess the quality of the banknote based on the two-dimensional images of the creases.
  • the light source comprises a light source of green light, such as light with a wave length of approximately 525 nm, or a light source of infrared light, for instance light with a wavelength between 800 - 1000 nm, and preferably approximately 850 nm.
  • the upper value of 1000 nm is preferred in order to reduce the chance of difficulties in detection with the camera.
  • green light and infrared light are suitable wavelengths for lighting in order to show creases in polymer banknotes.
  • the step of comparing comprises the step of subtracting the captured detected light made in the first and the second analysis step to obtain a subtracted photo with creases and plain surfaces.
  • the comparing step comprises the step of quantifying the number or surface area of the plain surfaces of the banknote from the subtracted photo.
  • the subtracted image is easy to analyse due to the absence of print patterns on the image.
  • Algorithms may be used in order to analyse the subtracted photo, e.g. by counting maxima and minima, which may take the form of, possibly coupled, pixel elements.
  • maxima and minima may take the form of, possibly coupled, pixel elements.
  • pattern recognition techniques it is possible to quantify number and/or surface area of the creases .
  • banknotes which show a low variability will typically have a good quality and may be recirculated, whereas banknotes with a high variability should be rejected.
  • the projected light is detected by at least one phototransistor , arranged at different angles of detection relative to the one face of the banknote in the first and second analysis step, wherein the comparison step comprises the steps of:
  • the banknote will be exposed to light (preferably white light) at an angle of incidence, preferably between 20 and 90 degrees with respect to the banknote face, and the light reflected will be measured using phototransistors at an angle of detection, at the opposing side of the normal to the face of the banknote, preferably also at angles between 20 and 90 degrees.
  • phototransistors photodiodes with amplifiers may also be used .
  • Each of the phototransistors will output a value
  • the method comprises the steps of:
  • the crease factor of banknotes In order to reliably assess the quality of banknotes, it is preferred to compare the crease factor of banknotes to be tested with a crease factor from a reference banknote which does meet the standards.
  • the reference banknote serves as a calibration. The degree of deviation between this reference banknote and banknotes tested will provide an indication for the quality of the banknote.
  • the method comprises, after the first and second analysis steps, the steps of:
  • the method is preferably carried out in a device in which the banknotes are moved or carried through the device, for instance by rollers, such as known in currently used devices for checking the authenticity of banknotes. This makes it possible to make the captures of only a small segment of the banknote. After moving the complete banknote along the detector, the captures of all segments under the same
  • the embodiment using phototransistors may be preferred over the embodiment using a camera, since the latter embodiment requires very rapid switching. For this reason, it is, especially in the latter embodiment, also possible to move the banknote stepwise over predetermined intervals, wherein the at least two
  • the banknote is a polymer
  • the invention further relates to a device for testing banknote quality, comprising:
  • At least one detector which detector is directed towards the carrier at an angle of detection, different from the angle of incidence, for capturing light received from the light source via a banknote carried by the carrier.
  • the device according to the invention is an example of a device suitable for carrying out the method according to the invention.
  • a banknote is arranged such that it will be exposed the light from the light source when the light source is turned on, and such that the detector will be able to detect the light reflecting from the banknote.
  • the detector comprises a camera, which camera is at a fixed position, wherein the light sources comprise a first light source arranged at an angle of
  • a camera (preferably a monochrome camera) is arranged at a distance from the carrier, such that it can detect the light from the light source.
  • a light source is arranged to light the banknote arranged in the carrier.
  • two light sources are arranged, each at the same position with respect to the camera, but on opposing sides.
  • the lights are preferably arranged in a light frame.
  • the wavelength of the light is green or infrared, since it has been found that green light and
  • infrared light are suitable wavelengths for lighting in order to show creases in polymer banknotes.
  • light sources may also be arranged in the device, such as for instance light sources used for verifying the authenticity of the banknote. These light sources may be arranged adjacent to the light sources used for the invention, but also behind the carrier, where applicable.
  • the device comprises a frame with a semicircle-shape and a radius, with a row of light sources arranged along the first half of the semicircle-shape, and wherein the at least one detector comprises a row of
  • phototransistors arranged along the opposing second half of the semicircle-shape, wherein the centre of the semicircle- shape is arranged at or near the carrier.
  • the banknote will be exposed in the device to light (preferably white light) at an angle of incidence, preferably between 20 and 90 degrees with respect to the banknote face, and the light reflected will be measured using phototransistors at an angle of detection, at the opposing side of the normal to the face of the banknote, preferably also at angles between 20 and 90 degrees.
  • light preferably white light
  • phototransistors at an angle of detection, at the opposing side of the normal to the face of the banknote, preferably also at angles between 20 and 90 degrees.
  • the row may be two-dimensional but is preferably three-dimensional, in order to be able to capture a wide area.
  • the device comprises feeding means, for feeding banknotes towards and from the carrier.
  • the carrier is connected to feeding means, such as rollers, which may feed the banknotes into and out from the carrier.
  • feeding means such as rollers
  • Figure 1 shows a top view of a device according to a first embodiment of the invention.
  • Figures 2A, 2B and 2C show the image obtained with the device according to figure 1, when using respectively the first light source, the second light source, and when
  • Figure 3 shows a device according to a second embodiment of the invention.
  • Figure 1 shows a first embodiment of a device 1 according to the invention.
  • the device 1 comprises a carrier 2 with a banknote 3 on top of it.
  • a monochromic camera 4 is arranged directed towards the banknote 3 at a 90 degrees angle to the face of the banknote 3.
  • light sources 5, 6 are arranged at respective angles a and '. Light emitted from these light sources 5, 6 may be captured by camera 4.
  • the banknote 3 may be moved in direction 14.
  • Figure 2A shows a banknote 3 with creases 7, 8, 9, 10, 11, 12.
  • light source 6 was turned on and light source 5 was turned off, resulting in shadows 7a, 8a, 9a, 10a, 11a and 12a to the right.
  • light source 5 was turned on and light source 6 was turned off, resulting in shadows 7b, 8b, 9b, 10b, lib, 12b to the left.
  • the creases 7, 8, 9, 10, 11, 12 may be assessed purely, without the image printed on the banknote 3.
  • the capture may for instance be distributed in segments 13a-i for further assessment.
  • FIG. 3 shows another device 20 according to the invention.
  • the device 20 comprises a carrier 21, with a semicircle shaped shell 22 facing the banknote 23 arranged in the carrier 21.
  • the shell 22 has a first half (A) with light sources (LEDs transmitting white light) 24, 25, 26, 27, 28, 29, 30, 31, arranged at ⁇ -angles of 20, 30, 40, 50, 60, 70, 80 and approximately 90 degrees respectively.
  • the shell also has a second half (B) with phototransistors 32, 33, 34, 35, 36, 37, 38, 39, arranged at ⁇ -angles of 20, 30, 40, 50, 60, 70, 80 and approximately 90 degrees respectively.
  • the banknote 23 may be moved in direction 40.

Abstract

L'invention concerne un procédé de test de qualité de billet de banque, comprenant les étapes consistant : - à prendre un billet de banque ; - à une première étape d'analyse, à projeter de la lumière par une source de lumière à un certain angle d'incidence sur l'une des faces du billet de banque et détecter la lumière projetée, par un détecteur, à un certain angle de détection différent de l'angle d'incidence ; - après la première étape d'analyse, à changer l'angle d'incidence et/ou l'angle de détection ; - à une seconde étape d'analyse, après avoir changé l'angle d'incidence et/ou l'angle de détection, à projeter de la lumière à l'angle d'incidence sur ladite face du billet de banque et à détecter la lumière projetée, par un détecteur, à l'angle de détection qui est différent de l'angle d'incidence à la seconde étape de projection ; et - à comparer la lumière projetée détectée de la première étape d'analyse et de la seconde étape d'analyse afin de détecter des plis et des surfaces lisses dans le billet de banque. L'invention concerne également un dispositif de test de qualité de billet de banque.
PCT/NL2016/050440 2016-06-22 2016-06-22 Procédé de test de qualité de billet de banque et dispositif de test de qualité de billet de banque WO2017222365A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/NL2016/050440 WO2017222365A1 (fr) 2016-06-22 2016-06-22 Procédé de test de qualité de billet de banque et dispositif de test de qualité de billet de banque

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NL2016/050440 WO2017222365A1 (fr) 2016-06-22 2016-06-22 Procédé de test de qualité de billet de banque et dispositif de test de qualité de billet de banque

Publications (1)

Publication Number Publication Date
WO2017222365A1 true WO2017222365A1 (fr) 2017-12-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2016/050440 WO2017222365A1 (fr) 2016-06-22 2016-06-22 Procédé de test de qualité de billet de banque et dispositif de test de qualité de billet de banque

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Country Link
WO (1) WO2017222365A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2398556A1 (fr) * 2000-01-21 2001-07-26 Flex Products, Inc. Systemes de verification automatisee et procedes d'utilisation avec des dispositifs d'interference optique
WO2001084126A2 (fr) * 2000-04-28 2001-11-08 Electro Scientific Industries, Inc. Eclairage directionnel et procede de distinction de trois informations dimensionnelles
WO2010065229A2 (fr) * 2008-11-25 2010-06-10 De La Rue North America Inc. Éclairage séquençé
US20100322503A1 (en) * 2008-01-31 2010-12-23 Universal Entertainment Corporation Paper sheet identifying device and paper sheet identifying method
WO2011085041A2 (fr) * 2010-01-07 2011-07-14 De La Rue North America Inc. Systèmes et procédés permettant de détecter un matériau optiquement variable
EP2711901A1 (fr) * 2012-09-19 2014-03-26 Kabushiki Kaisha Toshiba Appareil de lecture d'image et appareil de traitement de feuille

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2398556A1 (fr) * 2000-01-21 2001-07-26 Flex Products, Inc. Systemes de verification automatisee et procedes d'utilisation avec des dispositifs d'interference optique
WO2001084126A2 (fr) * 2000-04-28 2001-11-08 Electro Scientific Industries, Inc. Eclairage directionnel et procede de distinction de trois informations dimensionnelles
US20100322503A1 (en) * 2008-01-31 2010-12-23 Universal Entertainment Corporation Paper sheet identifying device and paper sheet identifying method
WO2010065229A2 (fr) * 2008-11-25 2010-06-10 De La Rue North America Inc. Éclairage séquençé
WO2011085041A2 (fr) * 2010-01-07 2011-07-14 De La Rue North America Inc. Systèmes et procédés permettant de détecter un matériau optiquement variable
EP2711901A1 (fr) * 2012-09-19 2014-03-26 Kabushiki Kaisha Toshiba Appareil de lecture d'image et appareil de traitement de feuille

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