WO2016184336A1

WO2016184336A1 - Paper money detection method and paper money processing device

Info

Publication number: WO2016184336A1
Application number: PCT/CN2016/081769
Authority: WO
Inventors: 刘丙庆; 姜天信; 焦朋; 邢月启; 王春涛
Original assignee: 山东新北洋信息技术股份有限公司
Priority date: 2015-05-15
Filing date: 2016-05-11
Publication date: 2016-11-24
Also published as: CN106296973B; CN106296973A

Abstract

A paper money detection method and a paper money processing device. The paper money detection method comprises: collecting an optical image of paper money (S301), wherein collecting the optical image of the paper money comprises collecting a reflected light image of a first surface of the paper money and a reflected light image of a second surface of the paper money; and according to the reflected light image of the first surface of the paper money, detecting whether a transparent adhesive tape is pasted on the first surface of the paper money, and according to the reflected light image of the second surface of the paper money, detecting whether a transparent adhesive tape is pasted on the second surface of the paper money (S302). The problems in the related art of higher manufacturing costs and assembly difficulty of a paper money processing device can be effectively solved.

Description

Banknote detecting method and banknote processing device

Technical field

The present application relates to the field of banknote processing, and relates to, for example, a banknote detecting method and a banknote processing device.

Background technique

When the banknote processing apparatus such as the coin reader, the money counter, and the sorter performs banknote processing, it is usually necessary to detect whether the banknote is transported repeatedly, whether or not the transparent tape is attached, and the authenticity of the banknote is discriminated. It is detected whether the banknote is re-expanded to avoid misidentification of the banknote, whether the banknote is pasted with the transparent tape, and the authenticity of the banknote is used to prevent the flow of the counterfeit banknote.

In the related art, the banknote processing device generally includes an image sensor. During the banknote processing, the image sensor is used to collect an optical image of the banknote. If it is necessary to detect whether the surface of the banknote is pasted with a transparent tape, a thickness measuring module is also required, and the thickness measuring module is used for The thickness of the banknote is detected, and the controller of the banknote processing apparatus detects the authenticity of the banknote based on the optical image of the banknote collected by the image sensor, and determines whether the banknote is repeatedly conveyed based on the thickness of the banknote detected by the thickness measuring module or whether the surface of the banknote is pasted with a transparent tape.

As shown in FIG. 1, the thickness measuring module of the banknote processing apparatus includes a reference roller 1', a plurality of detecting assemblies, and a support shaft 3'. The reference roller 1' extends in the width direction of the bill, and the length of the reference roller 1' and the width of the bill. Suitably, the support shaft 3' is disposed in parallel with the reference roller 1', and a plurality of detecting assemblies are arranged along the support shaft 3'. Each detecting assembly includes a bracket 4' sleeved with the supporting shaft 3', and is disposed on the bracket. The thickness measuring roller 2' on 4', the elastic member 5' for biasing the holder 4' to always press the detecting roller 2' toward the reference roller 1', and the detecting member 6' provided on the holder 4' and disposed at A sensor 7' on the fixed frame that is mated or separated from the detecting member 6'. When the banknote passes between the reference roll 1' and the detecting roll 2', if there is no stick on the banknote When the transparent tape is attached and the banknote is conveyed in a single sheet, the height at which the banknote raises the detecting roller 2' is the thickness of the banknote. At this time, the sensor 7' is at a first distance from the detecting member 6', and the sensor 7' outputs the first detecting signal. If the banknote is affixed with a transparent tape or the banknote is repeatedly conveyed, the height at which the banknote raises the detecting roller 2' is the thickness of the banknote and the scotch tape and the thickness of the banknote conveyed by the double sheet, and the sensor 7' and the detection at this time The distance between the pieces 6' is greater than the first distance, and the sensor 7' outputs a second detection signal, and the controller of the banknote processing device determines whether the banknote is re-tensioned or whether the surface of the banknote is pasted with a transparent tape according to the detection signal output by the sensor 7'. .

Since the banknote processing apparatus of the related art detects whether or not the transparent tape is attached to the surface of the banknote, whether the banknote is re-transferred, and the authenticity of the banknote is discriminated, the image sensor and the thickness measuring module are separately provided to realize the detection of the banknote, and thus, to some extent, The manufacturing cost and assembly difficulty of the banknote processing apparatus are increased.

In view of the problem of the manufacturing cost and the difficulty of assembly of the banknote processing apparatus of the related art, an effective solution has not yet been proposed.

Summary of the invention

The main object of the present application is to provide a banknote detecting method and a banknote processing apparatus to solve the problems of manufacturing cost and assembly difficulty of the banknote processing apparatus of the related art.

In one aspect, the present application provides a banknote detecting method. The banknote detecting method comprises: collecting an optical image of the banknote, wherein collecting the optical image of the banknote comprises collecting the reflected light image of the first side of the banknote and the reflected light image of the second side of the banknote; and detecting the banknote according to the reflected light image of the first side of the banknote Whether the first side of the banknote is affixed with scotch tape, and the second side of the banknote is detected according to the reflected light image on the second side of the banknote Paste with scotch tape.

Optionally, collecting the optical image of the banknote further comprises collecting a transmitted light image of the banknote; and detecting whether the banknote is repeatedly conveyed according to the transmitted light image of the banknote.

Optionally, detecting whether the banknote is multi-sheeted according to the transmitted light image of the banknote comprises: calculating a mean value of the gray value of the plurality of pixel points in the transmitted light image; determining whether the average value of the gray value is greater than the first preset threshold; If the average value of the degree value is greater than the first preset threshold value, the banknote is repeatedly conveyed; if it is determined that the gray value average value is less than or equal to the first preset threshold value, it is determined that the banknote is not repeatedly conveyed.

Optionally, after collecting the optical image of the banknote, the method further comprises: detecting the authenticity of the banknote according to the reflected light image of the first side of the banknote, the reflected light image of the second side of the banknote, and the transmitted light image of the banknote.

Optionally, the banknote processing device performs detection on the banknote, and the banknote processing device includes a first image sensor and a second image sensor disposed on two sides of the banknote transport channel, and collects the reflected light image of the first side of the banknote and the second side of the banknote The reflected light image includes: collecting the reflected light image of the first side of the banknote by the first image sensor; collecting the reflected light image of the second side of the banknote by the second image sensor, wherein the reflected light image of the first side of the banknote includes the first banknote The diffuse reflection image of the surface and the specular reflection image of the first side of the banknote, the reflected light image of the second side of the banknote includes a diffuse reflection image of the second side of the banknote and a specular reflection image of the second side of the banknote. Collecting the transmitted light image of the banknote includes collecting the transmitted light image of the banknote by the first image sensor or the second image sensor.

Optionally, collecting the reflected light image of the first side of the banknote and the reflected light image of the second side of the banknote include: collecting a plurality of reflected light images of the first side of the banknote and a plurality of reflected light images of the second side of the banknote. Collecting a transmitted light image of a banknote includes collecting a plurality of transmitted light images of the banknote. Detecting whether the first surface of the banknote is pasted with a transparent tape according to the reflected light image on the first surface of the banknote, and detecting whether the second surface of the banknote is pasted with the transparent tape according to the reflected light image of the second surface of the banknote includes: according to the first side of the banknote Reflected light image Do not detect whether the first side of the banknote is pasted with a transparent tape, and detect whether the second side of the banknote is pasted with a transparent tape according to the plurality of reflected light images on the second side of the banknote. Detecting whether the banknote is re-transported according to the transmitted light image of the banknote includes: detecting whether the banknote is re-transported according to the plurality of transmitted light images of the banknote.

Optionally, the reflected light image on each side of the banknote is determined according to the following method: whether the surface of the banknote is pasted with a transparent tape: the gray value of each pixel in the reflected light image of the banknote is sequentially compared with a second preset threshold. Obtaining a comparison result; determining an abnormal pixel point in the reflected light image according to the comparison result; counting the number of adjacent abnormal pixel points in the reflected light image; determining whether the number of adjacent abnormal pixel points is greater than a third preset threshold; If it is determined that the number of adjacent abnormal pixel points is greater than a third preset threshold, it is determined that the banknote is pasted with the transparent tape, and if it is determined that the number of abnormal pixel points is less than or equal to the third predetermined threshold, it is determined that the banknote is not pasted with the transparent tape.

According to another aspect of the present application, a banknote processing apparatus is provided. The banknote processing device includes: an image acquiring unit, configured to collect an optical image of the banknote, wherein collecting the optical image of the banknote comprises collecting a reflected light image of the first side of the banknote and a reflected light image of the second side of the banknote; and a controller for A transparent tape is attached to the first surface of the banknote based on the reflected light image on the first side of the banknote, and a transparent tape is attached to the second side of the banknote based on the reflected light image on the second side of the banknote.

Optionally, the image obtaining unit is further configured to collect the transmitted light image of the banknote; the controller is further configured to detect whether the banknote is re-tensioned according to the transmitted light image of the banknote.

Optionally, the image obtaining unit comprises: a first image sensor, located at one side of the banknote conveying channel, comprising a first illuminator and a first photosensitive element array, wherein the first photosensitive element array is configured to generate the first side of the banknote The reflected light image, the reflected light image of the first side of the banknote includes a diffuse reflection image of the first side of the banknote and a specular reflection image of the first side of the banknote; and the second image sensor is located on the other side of the banknote transport channel, including the second illuminating And a second array of photosensitive elements, wherein the second array of photosensitive elements is used for a reflected light image of the second side of the banknote, the reflected light image of the second side of the banknote includes a diffuse reflection image of the second side of the banknote and a specular reflection image of the second side of the banknote, wherein the first photosensitive element array or the second photosensitive element The array of elements is also used to generate a transmitted light image of the banknote.

According to the application, it is possible to determine whether or not the transparent tape is attached without setting the thickness measuring module, and only the image sensor can be set to detect whether the banknote is re-tensioned, whether the transparent tape is pasted, and the authenticity of the banknote is discriminated, which can effectively solve the relevant The manufacturing cost and assembly difficulty of the technical banknote processing apparatus are high.

DRAWINGS

The accompanying drawings, which are incorporated in the claims of the claims In the drawing:

1 is a schematic structural view of a banknote thickness detecting device in the related art;

2 is a schematic diagram showing the module composition of a banknote processing apparatus according to a first embodiment of the present invention;

3 is a schematic structural diagram of an image acquisition unit of a banknote processing apparatus according to a first embodiment of the present invention;

4 is a schematic structural diagram of an image acquisition unit of a banknote processing apparatus according to a second embodiment of the present invention;

Figure 5 is a flow chart showing a method of detecting a banknote according to a third embodiment of the present invention.

detailed description

It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings.

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. It is an embodiment of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope shall fall within the scope of the application.

It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or order. It should be understood that the data so used may be interchanged where appropriate to facilitate the embodiments of the present application described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.

Embodiment 1

2 is a schematic diagram showing the module composition of a banknote processing apparatus according to a first embodiment of the present invention, which may be a coin reader, a money counter or a sorter. As shown, the banknote processing apparatus 1 includes a controller 2, a transport unit 3, an image acquisition unit 4, and a memory 5.

As shown, the banknote processing apparatus 1 includes a controller 2, a transport unit 3, an image acquisition unit 4, and a memory 5.

The controller 2 is for controlling other modules to perform work and performing calculation and processing of data, for example, controlling the transport unit 3 to drive the banknotes to move in the transport path of the banknote processing apparatus 1, and controlling the image acquisition unit 4 to collect optical images of the banknotes and the like.

The conveying unit 3 is for driving the banknotes to move in the conveying path of the banknote processing apparatus 1, and the conveying unit 3 includes a motor driver 31, a conveying motor 32, and a conveying roller assembly 33 disposed in the conveying path. The motor driver 31 is configured to supply an operating current to the conveying motor 32 according to a control signal output from the controller 2 to drive the conveying motor 32 to rotate. The output shaft of the conveying motor 32 is drivingly coupled to the conveying roller assembly 33, and the output shaft of the conveying motor 32 is rotated. At this time, the conveying roller assembly 33 rotates accordingly, thereby driving the banknotes to move in the conveying path.

The image acquisition unit 4 is for acquiring digital image data of a banknote, and the image acquisition unit 4 may include a first image sensor 41, a second image sensor 42, and an AD converter 43.

The first image sensor 41 and the second image sensor 42 are used to collect an optical image of the banknote and convert the optical signal into an electrical signal to output an analog image signal of the banknote. The first image sensor 41 and the second image sensor 42 may be a contact image sensor (CIS) or a charge-coupled device (CCD). In this embodiment, the first image sensor 41 and The second image sensor 42 is a CIS, the first image sensor 41 includes a first illuminator 411 and a first photosensitive element array 412, and the second image sensor 42 includes a second illuminator 421 and a second photosensitive element array 422. Since the first image sensor 41 and the second image sensor 42 operate in the same principle, for convenience of description, the first image sensor 41 and the second image sensor 42 will be collectively referred to as an image sensor, and the first illuminator 411 and the second illuminator will be hereinafter. The 421 is collectively referred to as an illuminator, and the first photosensitive element array 412 and the second photosensitive element array 422 are collectively referred to as a photosensitive element array. The illuminator is for emitting light that is irradiated on the banknote. Optionally, the illuminator comprises a plurality of sub-illuminators, such as an ultraviolet illuminator, a white illuminator, and Infrared illuminator, each sub illuminator is a line source extending along a main scanning direction (ie, a direction perpendicular to the direction in which the banknote is transported), the line source may be composed of an array of point sources, or may be a point source through the light guiding element a converted line source; the photosensitive element array includes a plurality of photosensitive elements arranged in a row in a main scanning direction, the plurality of photosensitive elements for receiving light reflected or transmitted through the banknote and converting it into an analog image signal, thereby realizing collecting banknotes The reflected light image or the transmitted light image, each time the image is captured, the photosensitive element array outputs an analog image signal corresponding to a point of the pixel of the banknote image, and each of the photosensitive elements corresponds to one pixel of the banknote image.

The AD converter 43 is for analog-to-digital conversion of the analog image signals of the banknotes output by the first image sensor 41 and the second image sensor 42, and generates digital image data of the banknotes. The AD converter 43 performs analog-to-digital conversion on the analog image signal corresponding to each pixel point of the banknote image, and outputs the gradation value of each pixel. The value range of the gray value of each pixel is related to the specification of the AD converter 43. In this embodiment, the AD converter 43 is an 8-bit AD converter, and the gray value of each pixel is in a range of 0 to 255. Optionally, the AD converter 43 includes a first AD converter 431 and a second AD converter 432, wherein the first AD converter 431 is configured to perform analog to digital conversion on the analog image signal output by the first image sensor 41. The two AD converter 432 is for performing analog to digital conversion on the analog image signal output by the second image sensor 42.

Optionally, the image acquisition unit 4 further includes a transmissive light source 44 for emitting transmitted light that is illuminated on the banknote. Optionally, the transmission light source 44 includes a plurality of transmission sub-light sources, such as an ultraviolet light transmission source, a white light transmission source, and an infrared light transmission source, each of the transmission sub-light sources being a line source extending along a main scanning direction, and the line source may be It is composed of a point source array, and may also be a line source whose point source is converted by a light guiding element.

The memory 5 is for storing a control program of the banknote processing apparatus 1 and storing data and variables generated during the operation of the control program, and the memory 5 is also for storing a digital map of the banknotes output by the AD converter 43. The image is stored, a first preset threshold for determining whether the banknote is re-bagged, a second preset threshold for detecting whether the banknote is pasted with the scotch tape, and a threshold group for determining the authenticity of the banknote are stored. Optionally, the controller 2 can detect whether the banknote is re-transported according to the data stored in the memory 5, detect whether the banknote is pasted with the transparent tape, and detect the authenticity of the banknote.

3 is a schematic structural view of an image acquisition unit 4 of the banknote processing apparatus according to the first embodiment of the present invention. As shown, the banknotes 10 are moved along the banknote transport path, and the first image sensor 41 and the second image sensor 42 are respectively located on the banknotes. Two sides of the conveying passage, wherein the first image sensor 41 is used to collect the reflected light image of the first surface 10a of the banknote 10, and the second image sensor 42 is used to collect the reflected light image of the second surface 10b of the banknote 10, optionally The second image sensor 42 is also used to collect a transmitted light image of the banknote.

The first image sensor 41 may include a first illuminator 411, a first photosensitive element array 412, a first lens array 413, a first light transmissive plate 414, and a first frame 415, and the first light transmissive plate 414 will be the first illuminator 411. The first photosensitive element array 412 and the first lens array 413 are packaged in a chamber of the first frame 415. The light incident surface 4131 of the first lens array 413 is disposed at an angle with the first light transmitting plate 414, and the light incident surface 4131 of the first lens array 413 is located at a light emitted by the first light emitting surface 4111 of the first illuminator 411. The propagation path of the reflected light generated by the specular reflection occurs on the first surface 10a of the banknote 10, and therefore, when the first illuminator 411 emits incident light for illuminating the banknote 10 from the first light-emitting surface 4111, if the banknote 10 Since the first surface 10a of the first surface 10a is not affixed with the transparent tape, since the surface of the banknote is microscopically uneven, the light emitted by the first illuminator 411 is irradiated on the surface of the banknote, and the reflected light has different reflection angles, thereby forming a diffuse reflection. Only part of the reflected light is incident on the light incident surface 4131 of the first lens array 413. The first lens array 413 concentrates the reflected light onto the first photosensitive element array 412. At this time, the first photosensitive element array 412 converts the reflected light into Simulating the image signal, realizing the diffuse reflection light image of the first surface 10a of the banknote 10; if the first surface 10a of the banknote 10 is pasted with a transparent tape, The surface of the scotch tape is smooth. Therefore, the light emitted from the first illuminator 411 is irradiated on the surface of the scotch tape, and the reflected light is reflected at the same angle to form a specular reflection. Most of the reflected light is incident on the illuminating surface of the first lens array 413. At 4131, the first lens array 413 converges the reflected light to the first photosensitive element array 412. At this time, the first photosensitive element array 412 converts the reflected light into an analog image signal, thereby realizing the specular reflection of the first surface 10a of the collecting banknote 10. Light image.

The second image sensor 42 may include a second illuminator 421, a second photosensitive element array 422, a second lens array 423, a second light transmissive plate 424, a second frame 425, and a third lens array 426, wherein the second light transmission The board 424 encloses the second illuminator 421, the second photosensitive element array 422, the second lens array 423, and the third lens array 426 in a chamber of the second frame 425. Both the second lens array 423 and the third lens array 426 converge the respective received light rays to the second photosensitive element array 422. The light incident surface 4231 of the second lens array 423 is disposed at an angle with the second light transmitting plate 424, and the light incident surface 4231 of the second lens array 423 is located on the light bank 10 by the light emitted from the light emitting surface 4211 of the second illuminator 421. On the propagation path of the reflected light generated by the specular reflection on the second surface 10b, similarly, when the second illuminator 421 emits the incident light for illuminating the second surface 10b of the banknote 10 from the light-emitting surface 4211, if the banknote The second surface 10b is not pasted with the transparent tape, and the light emitted by the second illuminator 421 is irradiated on the second surface 10b of the banknote 10, and the reflected light has a different angle of reflection, forming a diffuse reflection, and the second photosensitive element array 422 will reflect The light is converted into an analog image signal to realize the diffuse reflection light image of the second surface 10b of the banknote 10; if the second surface 10b of the banknote 10 is pasted with the transparent tape, the light emitted by the second illuminator 421 is irradiated on the surface of the transparent tape. The reflected light rays are reflected at the same angle to form a specular reflection, and the second photosensitive element array 422 converts the reflected light into an analog image signal to realize the specular reflection of the second surface 10b of the banknote 10 image.

Alternatively, the image acquisition unit 4 may further include a transmission light source 44 that is located on the same side of the banknote transport path as the first image sensor 41. As shown in FIG. 3, the transmitted light source 44 and the second image The third lens array 426 of the sensor 42 is oppositely disposed. The light-emitting surface 441 of the transmission light source 44 is parallel to the light-incident surface 4261 of the third lens array 426, and the light-incident surface 4261 of the third lens array 426 is located on the light-emitting surface 441 of the transmission light source 44. The emitted light illuminates the propagation path of the transmitted light generated after the banknote 10. When the transmitted light source 44 emits light, the light emitted from the light-emitting surface 441 of the transmitted light source 44 passes through the banknote 10 and the second transparent plate 424, and then illuminates the light-incident surface 4261 of the third lens array 426. The third lens array 426 The transmitted light is concentrated to the second photosensitive element array 422. At this time, the second photosensitive element array 422 converts the transmitted light into an analog image signal, thereby realizing the transmitted light image of the collected banknote.

Embodiment 2

4 is a schematic structural diagram of an image acquisition unit of a banknote processing apparatus according to a second embodiment of the present invention. This embodiment is different from the first embodiment. In this embodiment, the image acquisition unit 4 is not provided with a transmission light source 44, and the first image is The first illuminator 411 of the sensor 41 is further provided with a second illuminating surface 4112. The second illuminating surface 4112 is disposed at an angle with the first illuminating surface 4111. The second illuminating surface 4112 and the third lens array 426 of the second image sensor 42 are disposed. The light incident surface 4261 is parallel and oppositely disposed, and the light incident surface 4261 of the third lens array 426 is located on a propagation path of the transmitted light generated after the light emitted by the second light exit surface 4112 of the first illuminator 411 is irradiated on the banknote 10. The light emitted from the second light-emitting surface 4112 of the first illuminator 411 passes through the first light-transmitting plate 414, the banknote 10, and the second light-transmitting plate 424, and then illuminates the light-incident surface 4261 of the third lens array 426. The three lens array 4261 converges the transmitted light to the second photosensitive element array 422 of the second image sensor 42, and according to the converted light of the second photosensitive element array 422 into an analog image signal, the transmitted light image of the banknote is collected.

This embodiment reduces the transmission light source as compared with the first embodiment, and the cost of the banknote processing apparatus can be reduced.

Embodiment 3

The embodiment of the present invention further provides a banknote detecting method, which can be, but is not limited to, performing banknote detection by the banknote processing apparatus provided by the embodiment of the present invention.

5 is a flow chart of a method for detecting a banknote according to a third embodiment of the present invention. As shown, the method includes the following steps:

S201, collecting an optical image of the banknote.

The banknote processing apparatus includes an image acquisition unit 4 and a controller 2, and further includes a transport unit 3 and a memory 5.

The image acquisition unit 4 is configured to collect an optical image of the banknote, and the controller 2 is configured to control the conveying unit 3 to drive the banknote to be transported in the conveying channel. During the process of conveying the banknote, the controller 2 controls the image acquiring unit 4 to collect the reflected light image of the first side of the banknote. The reflected light image of the second side, optionally, the controller 2 also controls the image acquisition unit 4 to collect the transmitted light image of the banknote. The reflected light image on the first side of the banknote, the reflected light image on the second side of the banknote, and the transmitted light image of the banknote may be collected according to all of them, or only a part may be collected as needed, and accordingly, if only a part of the image is collected, A banknote processing apparatus having only the function of collecting partial images is employed. For example, if it is only necessary to detect whether the banknote is pasted with a transparent tape, only the reflected light image of the first side of the banknote and the reflected light image of the second side of the banknote may be collected, and only the reflected light image of the first side of the banknote and the banknote may be collected. A banknote processing device that reflects a light image on the second side.

The implementation process may be: the transport unit 3 moves a minimum unit distance (such as a line) for driving the banknotes, and the controller 2 controls the first illuminator 411 of the first image sensor 41 to emit light, and the second The second illuminator 421 of the image sensor 42 illuminates and/or transmits the light source 44 and collects an optical image of the banknote as each source illuminates. Wherein, when the first illuminator 411 of the first image sensor 41 emits light, the first photosensitive element array 412 controlling the first image sensor 41 outputs an analog image signal, and controls the first AD converter 431 to the first photosensitive element array 412. The output analog image signal is AD-converted, and the generated one-line digital image data is generated to generate a reflected light image of the first side of the banknote; when the second illuminator 421 of the second image sensor 42 emits light, the second image sensor 42 is controlled. The second photosensitive element array 422 outputs an analog image signal, and controls the second AD converter 432 to perform AD conversion on the analog image signal output by the second photosensitive element array 422 to generate a bit of digital image data to generate a second side of the banknote. The reflected light image; when the transmitted light source 44 emits light, the second photosensitive element array 422 controlling the second image sensor 42 outputs an analog image signal, and controls the second AD converter 432 to perform the analog image signal output by the second photosensitive element array 422. AD converts to generate a line of digital image data to generate a transmitted light image of the banknote.

Optionally, when the transmission light source 44 is not disposed in the image acquisition unit 4 and the first illuminator 411 of the first image sensor 41 is further provided with the second illuminating surface 4112, the controller 2 controls the first illuminating of the first image sensor 41. When the 411 is illuminated, the second photosensitive element array 422 controlling the second image sensor 42 outputs an analog image signal, and controls the second AD converter 432 to perform AD conversion on the analog image signal output by the second photosensitive element array 422, and generates a point. The digital image data is lined to generate a transmitted light image of the banknote.

S202, detecting whether the first surface of the banknote is pasted with the transparent tape according to the reflected light image on the first surface of the banknote, and detecting whether the second surface of the banknote is pasted with the transparent tape according to the reflected light image on the second surface of the banknote.

The controller 2 detects whether or not a transparent tape is attached to the first surface of the banknote based on the reflected light image on the first surface of the banknote, and detects whether or not the second surface of the banknote is pasted with the transparent tape according to the reflected light image on the second surface of the banknote. Optionally, the controller 2 determines whether the surface of the banknote is pasted with a transparent tape according to the gray value of each pixel in the reflected light image on each side of the banknote. For the reflected light image on each side of the banknote, the controller 2 performs the following operations:

a) sequentially comparing the gray value of each pixel in the reflected light image of the banknote with a second preset threshold, and determining the pixel according to the magnitude relationship between the gray value of each pixel and the second preset threshold An abnormal pixel point or a normal pixel point, for example, when the gray value of a pixel point is greater than a second preset threshold, determining that the pixel point is an abnormal pixel point, when the gray value of a pixel point is less than or equal to the second pre- When the threshold is set, it is determined that the pixel is a normal pixel.

Optionally, the second preset threshold is obtained by training the template in advance. For example, firstly, a large number of banknotes without scotch tape are used for training, and the reflected light images of the two faces of each banknote are collected, and the reflection of all the banknotes is calculated. The average value of the gray value of each pixel in the light image is obtained as the first gray value, and then a large amount of banknotes with transparent tape are used for training, and the reflected light images of the two faces of each banknote are collected, and the reflected light of all the banknotes is calculated. The average value of the gray values of the pixels in the area where the scotch tape is located in the image is the second gray value, and the average of the first gray value and the second gray value is used as the second preset threshold.

b) Counting the number of abnormally adjacent pixel points in the reflected light image of the banknote.

c) comparing the number of abnormal pixel points adjacent to each other with a third preset threshold. When the number of abnormal pixel points is greater than a third preset threshold, determining that the banknote is pasted with a transparent tape, when the number of abnormal pixel points is less than When it is equal to the third preset threshold, it is determined that the banknote is not pasted with the transparent tape.

When the banknote is not affixed with the scotch tape, the image sensor array of the image sensor receives the diffuse reflected light to generate a diffuse reflection image of the banknote. When the banknote is affixed with the scotch tape, the image sensor array of the image sensor receives the specularly reflected light to generate the banknote. Specular reflection image, when the light intensity received by the image sensor's photosensitive element array is weak when generating a diffuse reflection image, and the specular reflection image is generated The light element array receives a relatively high intensity of light, and therefore, the gray value of the pixel point in the diffuse reflection image of the banknote and the gray value of the pixel point in the specular reflection image of the banknote have a large difference, for example, in the diffuse reflection image of the banknote The gray value of the pixel is low, and the gray value of the pixel in the specular reflection image of the banknote is high. Therefore, by comparing the gray value of the pixel in the reflected light image of the banknote with the second preset threshold, it can be determined. Whether the pixel is an abnormal pixel point can further determine whether the banknote is pasted with a transparent tape.

Optionally, the banknote detecting method may further detect, according to the optical image of the banknote, whether the banknote is repeatedly conveyed or the authenticity of the banknote is discriminated.

Optionally, the controller 2 performs an arithmetic process according to the read digital image data, and detects whether the banknote is repeatedly conveyed, whether the transparent tape is pasted, and the authenticity of the banknote is discriminated.

In the embodiment of the present invention, the following method can be used to detect whether the banknote is transported repeatedly:

The controller 2 detects whether or not the banknote is re-transported based on the transmitted light image of the banknote.

The controller 2 detects whether or not the banknote is repeatedly conveyed based on the gradation value of each pixel point in the transmitted light image of the banknote. For example, the controller 2 calculates the mean value of the gray value of each pixel in the transmitted light image, and compares the calculated mean value of the gray value of each pixel with the first preset threshold stored in the memory 5, when calculating When the average value of the gray value of each pixel point is greater than the first preset threshold, it is determined that the banknote is re-sheeted. When the calculated average value of the gray value of each pixel is less than or equal to the first preset threshold, the banknote is not determined. Repeat delivery.

Optionally, the average value of the gray values of each pixel in the transmitted light image when the single banknote is transported may be calculated as the first preset threshold.

In the embodiment of the present invention, the following method can be used to detect the authenticity of the banknote:

The controller 2 is based on the reflected light image of the first side of the banknote, the reflected light image of the second side, and the banknote The transmitted light image identifies the authenticity of the banknote.

The controller 2 extracts the anti-counterfeiting feature of the banknote, and the anti-counterfeiting feature of the banknote includes a security line of the banknote, a watermark pattern, a light-changing ink pattern, and the like, and calculates a feature value of the banknote for detecting the authenticity of the banknote according to the anti-counterfeiting feature of the banknote, and each The feature value of the banknote for detecting the authenticity of the banknote is compared with a corresponding preset threshold value in the threshold group stored in the memory 5, thereby judging the authenticity of the banknote.

In the embodiment of the present invention, the execution order of detecting whether the banknote is re-tensioned, detecting whether the banknote is affixed with the scotch tape, and detecting the authenticity of the banknote may be arbitrary, and is not limited by the above embodiments.

Optionally, the controller 2 sequentially collects a plurality of reflected light images of the banknotes by time-divisionally controlling each sub-illuminator of the image sensor, and can also collect various kinds of transmitted light of the banknotes by controlling the sub-light sources of the transmissive light source by time-sharing. For example, the controller 2 illuminates the ultraviolet light reflected light image of the banknote by controlling the ultraviolet light illuminator of the image sensor, collects the white light reflected light image of the banknote by controlling the white light illuminator of the image sensor, and controls the infrared light of the image sensor. The light illuminator emits an infrared light reflected light image of the banknote; for example, the controller 2 illuminates and collects the ultraviolet light transmitted light image of the banknote by controlling the ultraviolet light source of the transmitted light source, and collects the white light transmission of the banknote by controlling the white light source of the transmitted light source. The light image, and the infrared light transmitting light image of the banknote is collected by controlling the infrared light transmitting light source of the image sensor, and the controller 2 performs banknote detection based on each of the reflected light image and the transmitted light image of the banknote.

According to the banknote detecting method or the banknote processing device of the embodiment of the present invention, it is possible to detect whether or not the transparent tape is attached or the banknote is re-transferred without providing a thickness measuring module, and the banknote processing device only needs to provide an image sensor to complete the detection of the banknote. Whether the counterfeit, the banknote is transported repeatedly, and whether the surface of the banknote is pasted with a transparent tape can effectively solve the manufacturing cost and assembly difficulty of the banknote processing device of the related art. A higher degree of problem.

The above description is only an alternative embodiment of the present invention, and is not intended to limit the present application, and various changes and modifications may be made to the present application.

Claims

A banknote detecting method, comprising:

Acquiring an optical image of the banknote, wherein acquiring the optical image of the banknote comprises collecting a reflected light image of the first side of the banknote and a reflected light image of the second side of the banknote;

A transparent tape is attached to the first surface of the banknote based on the reflected light image on the first surface of the banknote, and a transparent tape is attached to the second surface of the banknote based on the reflected light image on the second surface of the banknote.
The banknote detecting method according to claim 1, wherein

Collecting an optical image of the banknote further includes acquiring a transmitted light image of the banknote;

Whether the banknote is re-transported is detected based on the transmitted light image of the banknote.
The banknote detecting method according to claim 2, wherein detecting whether the banknote is repeatedly conveyed according to the transmitted light image of the banknote comprises:

Calculating a mean value of gray values of a plurality of pixel points in the transmitted light image;

Determining whether the average value of the gray value is greater than a first preset threshold;

If it is determined that the average value of the gray value is greater than the first preset threshold, determining that the banknote is re-tensioned; if it is determined that the gray value average is less than or equal to the first preset threshold, determining The banknotes are not conveyed repeatedly.
The method of detecting a banknote according to claim 2, wherein after the optical image of the banknote is collected, the method further comprises:

The authenticity of the banknote is detected based on the reflected light image of the first surface of the banknote, the reflected light image of the second surface of the banknote, and the transmitted light image of the banknote.
The banknote detecting method according to claim 2, wherein the banknote processing device performs detection on the banknote, the banknote processing device including a first image sensor and a second image sensor disposed on both sides of the banknote transport path,

Collecting the reflected light image of the first side of the banknote and the reflected light image of the second side of the banknote includes: collecting, by the first image sensor, a reflected light image of the first side of the banknote; and passing the second image sensor Collecting a reflected light image of the second side of the banknote, wherein the reflected light image of the first side of the banknote includes a diffuse reflection image of the first side of the banknote and a specular reflection image of the first side of the banknote, The reflected light image of the second side of the banknote includes a diffuse reflection image of the second side of the banknote and a specular reflection image of the second side of the banknote,

Acquiring the transmitted light image of the banknote includes collecting a transmitted light image of the banknote by the first image sensor or the second image sensor.
The banknote detecting method according to claim 2, wherein

Collecting the reflected light image of the first side of the banknote and the reflected light image of the second side of the banknote includes: collecting a plurality of reflected light images of the first side of the banknote and a plurality of reflected light images of the second side of the banknote ,

Collecting the transmitted light image of the banknote includes collecting a plurality of transmitted light images of the banknote,

among them:

Detecting whether a transparent tape is adhered to the first surface of the banknote according to the reflected light image of the first surface of the banknote, and detecting whether the second surface of the banknote is pasted with a transparent tape according to the reflected light image of the second surface of the banknote includes : detecting whether the first surface of the banknote is pasted with a transparent tape according to the plurality of reflected light images on the first surface of the banknote, and detecting the second of the banknotes according to the plurality of reflected light images of the second surface of the banknote Whether the surface is pasted with scotch tape,

Detecting whether the banknote is re-transported according to the transmitted light image of the banknote includes: detecting whether the banknote is repeatedly conveyed according to the plurality of transmitted light images of the banknote.
The banknote detecting method according to claim 1, wherein the reflected light image on each side of the banknote is judged by the following method as to whether or not the surface of the banknote is pasted with a transparent tape:

And sequentially comparing the gray value of each pixel in the reflected light image of the banknote with a second preset threshold to obtain a comparison result;

Determining an abnormal pixel point in the reflected light image according to the comparison result;

Counting the number of adjacent abnormal pixel points in the reflected light image;

Determining whether the number of the adjacent abnormal pixel points is greater than a third preset threshold;

If it is determined that the number of the adjacent abnormal pixel points is greater than the third preset threshold, determining that the banknote is pasted with a transparent tape, and if it is determined that the number of the abnormal pixel points is less than or equal to the third pre- When the threshold is set, it is determined that the banknote is not pasted with the transparent tape.
A banknote processing device, comprising:

An image acquisition unit (4) for collecting an optical image of the banknote, wherein acquiring the optical image of the banknote comprises collecting a reflected light image of the first side of the banknote and a reflected light image of the second side of the banknote;

The controller (2) is configured to detect, according to the reflected light image of the first surface of the banknote, whether a first surface of the banknote is pasted with a transparent tape, and detect the banknote according to the reflected light image of the second surface of the banknote Whether the two sides are pasted with scotch tape.
A banknote processing apparatus according to claim 8, wherein

The image acquisition unit (4) is further configured to collect a transmitted light image of the banknote;

The controller (2) is further configured to detect whether the banknote is repeatedly conveyed according to the transmitted light image of the banknote.
The banknote processing apparatus according to claim 9, wherein the image acquisition unit (4) comprises:

a first image sensor (41), located on one side of the banknote transport path, including a first illuminator (411) and a first photosensitive element array (412), wherein the first photosensitive element array (412) is used to generate a a reflected light image of the first side of the banknote, the reflected light image of the first side of the banknote including a diffuse reflection image of the first side of the banknote and a specular reflection image of the first side of the banknote;

a second image sensor (42), located on the other side of the banknote transport path, comprising a second illuminator (421) and a second photosensitive element array (422), wherein the second photosensitive element array (422) is And generating a reflected light image of the second surface of the banknote, wherein the reflected light image of the second surface of the banknote includes a diffuse reflection image of the second surface of the banknote and a specular reflection image of the second surface of the banknote,

Wherein, the first photosensitive element array (412) or the second photosensitive element array (412) is further used to generate a transmitted light image of the banknote.