CN115601871A - Detection device and detection method for photoluminescence of negotiable securities - Google Patents
Detection device and detection method for photoluminescence of negotiable securities Download PDFInfo
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- CN115601871A CN115601871A CN202110775957.3A CN202110775957A CN115601871A CN 115601871 A CN115601871 A CN 115601871A CN 202110775957 A CN202110775957 A CN 202110775957A CN 115601871 A CN115601871 A CN 115601871A
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- 238000001514 detection method Methods 0.000 title claims abstract description 72
- 238000005424 photoluminescence Methods 0.000 title claims abstract description 43
- 230000003287 optical effect Effects 0.000 claims abstract description 47
- 230000005284 excitation Effects 0.000 claims abstract description 41
- 238000007493 shaping process Methods 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 32
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 claims description 6
- 238000007639 printing Methods 0.000 claims description 3
- 238000000241 photoluminescence detection Methods 0.000 claims 1
- 239000000976 ink Substances 0.000 description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
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- 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
- G07D7/06—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
- G07D7/128—Viewing devices
-
- 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
- G07D7/20—Testing patterns thereon
- G07D7/202—Testing patterns thereon using pattern matching
- G07D7/206—Matching template patterns
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- Toxicology (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Abstract
The invention discloses a detection device for photoluminescence of negotiable securities, which comprises an excitation light source part, an optical shaping part and a photoelectric conversion part, wherein the excitation light source part is arranged at the upper left of the negotiable securities to be detected and used for emitting exciting light to the negotiable securities to be detected; the optical shaping part is arranged at the upper right of the valuable paper to be detected and is used for receiving light emitted from the ink on the valuable paper to be detected; and the photoelectric conversion part is connected with the optical shaping part, is arranged above the excitation light source part and the optical shaping part, and is used for acquiring the patterns of the valuable paper to be detected. The excitation light source part, the optical shaping part and the photoelectric conversion part are integrated into one device, so that the automatic detection device is suitable for automatic detection of various different securities, the detection efficiency is improved, and the detection cost is reduced; by optimizing the light path design and adopting the design of a high-brightness light source, a Bowell prism, a linear array image detection unit and the like, the high-speed and high-resolution image detection is realized.
Description
Technical Field
The invention relates to a detection device and a detection method for photoluminescence of securities, belonging to the technical field of financial authenticity identification.
Background
On the surface of securities such as bank notes, checks, bonds, stocks and the like, special printing materials and special anti-counterfeiting inks such as fluorescent inks or phosphorescent inks are generally adopted to print specific patterns, so that the anti-counterfeiting capability of the securities is improved. Therefore, the detection of the optical characteristics of the valuable documents is an important standard in the anti-counterfeiting work of the valuable documents.
The fluorescent image detection scheme on the existing currency counting machine has low detection speed and cannot meet the application requirement of high-speed detection. Moreover, once the photoluminescent security feature is altered, the detection scheme may vary widely.
In the chinese patent application No. 201010578699.1 entitled "apparatus and method for detecting photoluminescence of securities", the disclosed apparatus and method can detect photoluminescence anti-counterfeit features of securities, but cannot detect photoluminescence anti-counterfeit features of securities with high resolution in an image manner. The disadvantages of the prior art are mainly focused on two aspects: the detection speed and the detection resolution are low, so that the detection requirement of the valuable documents cannot be met.
Disclosure of Invention
The invention aims to solve the technical problem of providing a detection device for photoluminescence of valuable documents.
Another technical problem to be solved by the present invention is to provide a method for detecting photoluminescence of a valuable document.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a detecting device for photoluminescence of negotiable securities comprises an excitation light source part, an optical shaping part and a photoelectric conversion part,
the excitation light source part is arranged at the upper left of the negotiable securities to be detected and used for emitting excitation light to the negotiable securities to be detected;
the optical shaping part is arranged at the upper right part of the valuable paper to be detected and is used for receiving light emitted from the ink on the valuable paper to be detected;
and the photoelectric conversion part is connected with the optical shaping part, arranged above the excitation light source part and the optical shaping part and used for acquiring the patterns of the valuable paper to be detected.
Preferably, the angle between the excitation light emitted by the excitation light source and the light emitted by the ink on the document of value to be detected is greater than 0 ° and less than 90 °.
Wherein preferably, the exciting light source part comprises a support, a coupling light source input part and a line light source output part,
the coupling light source input part is arranged on the bracket and used for transmitting laser to the linear light source output part; the linear light source output part is arranged on the bracket, is connected with the output end of the coupling light source input part and is used for converting the exciting light transmitted from the coupling light source input part into a linear light source.
Preferably, a Powell prism is arranged in the linear light source output part, and the Powell prism converts the exciting light into a linear light source.
Preferably, the output end of the linear light source output part is provided with a light filtering part which filters the linear light source to obtain the excitation light with pure spectrum.
Preferably, the optical shaping unit is an optical lens.
Preferably, the optical shaping portion is provided with a light filtering portion, and the light filtering portion filters light emitted by ink on the valuable paper to be detected to obtain light with pure spectrum.
Wherein preferably, the photoelectric conversion part comprises a mounting groove and a strip-shaped window,
the mounting groove is a circular groove and is arranged towards the negotiable securities to be detected, the mounting groove is used for mounting the optical shaping part,
the strip-shaped window is arranged at the central part of the mounting groove, the strip-shaped window is parallel to the shape of exciting light emitted by the exciting light source part and has the same extending direction, and a linear array image detection unit is arranged in the strip-shaped window and is used for receiving light emitted by ink of negotiable securities to be detected.
Preferably, the line image detection unit is a line camera or a cis scanner.
Preferably, the line image detection unit comprises a line receiver, and the line receiver is any one of a VIS, NIR or SWIR line receiver.
Preferably, the system further comprises an image processing unit, the image processing unit receives the image information of the valuable documents shot by the photoelectric conversion part, matches the image information of the preset template, and judges the valuable documents as true valuable documents if the matching is passed, or judges the valuable documents as false valuable documents if the matching is not passed.
Preferably, the optical device further comprises a housing, and the excitation light source unit, the optical shaping unit and the photoelectric conversion unit are all disposed in the housing.
A method for detecting photoluminescence of negotiable securities adopts the detection device of the photoluminescence of the negotiable securities, and comprises the following steps:
s1: placing an opening part of a detection device for photoluminescence of the valuable papers above the valuable papers to be detected;
s2: the exciting light source part converts exciting light into a linear light source, irradiates on the negotiable securities to be detected and is used for exciting ink on the negotiable securities to be detected to emit light;
s3: an optical shaping unit for receiving light emitted from ink on a valuable document to be detected;
s4: the photoelectric conversion part acquires an image of an excited linear region of the valuable paper to be detected;
s5: moving the negotiable securities to be detected along a preset direction;
s6: repeating the steps S2-S5 until the photoelectric conversion part obtains a complete image of the valuable paper to be detected;
s7: the photoelectric conversion part transmits the acquired image of the negotiable securities to be detected to the image processing unit;
s8: the image processing unit matches the image of the negotiable securities with the image information of a preset template, if the matching is passed, the negotiable securities are judged to be true negotiable securities, and if the matching is not passed, the negotiable securities are judged to be false negotiable securities.
The invention has the following technical effects: compared with the prior art, the detection device and the detection method for the photoluminescence of the valuable documents integrate the excitation light source part, the optical shaping part and the photoelectric conversion part into one device, so that the detection device and the detection method are suitable for the automatic detection of the valuable documents with various specifications, improve the detection efficiency and reduce the detection cost; by optimizing the light path design and adopting the design of a high-brightness light source, a Bowell prism, a linear array image detection unit and the like, the high-speed and high-resolution image detection is realized.
Drawings
FIG. 1 is a schematic perspective view of a device for detecting photoluminescence of securities according to the present invention;
FIG. 2 is a schematic view of the internal structure of the apparatus for detecting photoluminescence of a valuable document according to the present invention;
FIG. 3 is a schematic structural diagram of the excitation light source unit in FIG. 2;
FIG. 4 is a schematic structural diagram of a Powell prism;
FIG. 5 is a diagram of the light path of light passing through a Powell prism;
FIG. 6 is a diagram of the light path of light rays passing through a cylindrical lens;
FIG. 7 is a schematic view of a filter portion;
FIG. 8a is a schematic perspective view of the photoelectric conversion part in FIG. 2;
fig. 8b is a schematic plan view of the photoelectric conversion part in fig. 2;
fig. 9 is a schematic view of a valuable document photographed by the detection device for photoluminescence of valuable documents provided by the present invention.
In the drawings, each reference numeral denotes:
100. a housing; 200. detecting the negotiable securities; 300. linear exciting light; 400. light for exciting ink on the valuable paper; 1. an excitation light source unit; 11. a support; 12. a coupling light source input; 13. a linear light source output unit; 131. a Powell prism; 2. an optical shaping unit; 3. a photoelectric conversion unit; 31. mounting grooves; 32. a strip-shaped window; 4. a light-filtering part.
Detailed Description
The technical contents of the invention are described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the apparatus for detecting photoluminescence of valuable documents of the present invention includes a housing 100, an excitation light source unit 1, an optical shaping unit 2, and a photoelectric conversion unit 3. The excitation light source unit 1, the optical shaping unit 2, and the photoelectric conversion unit 3 are all mounted inside the casing 100 and assembled integrally. The valuable paper 200 to be detected is placed under the opening part 101 of the shell 100, and the valuable paper 200 is subjected to anti-counterfeiting detection through the detecting device for detecting the photoluminescence of the valuable paper. Compared with the prior art, the integrated device for detecting the photoluminescence of the negotiable securities is more convenient to detect because all the parts are dispersedly arranged on different devices, realizes automatic detection and does not need to be limited by other devices. That is to say, the detection device for the photoluminescence of the valuable paper provided by the invention can be suitable for various detection environments. And the method can be suitable for detecting the securities with various specifications, and does not need to replace parts or debug again along with the difference of detection objects, thereby improving the detection efficiency and reducing the detection cost.
Specifically, as shown in fig. 2, the excitation light source unit 1 is disposed at the upper left of the valuable document 200 to be detected, and is configured to emit excitation light 300 to the valuable document 200 to be detected. The optical shaping section 2 is disposed at the upper right of the valuable document 200 to be detected, and receives light 400 emitted from ink on the valuable document 200 to be detected. The photoelectric conversion part 3 is connected with the optical shaping part 2, is arranged above the excitation light source part 1 and the light receiving part 2, and is used for acquiring patterns of the valuable paper 200 to be detected. The angle between the excitation light 300 emitted from the excitation light source section and the light 400 emitted from the ink 200 on the valuable paper to be detected is α, and 0 ° < α < 90 °, preferably 45 ° in the present embodiment. Compared with the existing detection device, the design shortens the path of light, shortens the time for acquiring the photoluminescence image of the negotiable securities immediately, and can effectively improve the speed of image detection.
As shown in fig. 3, the excitation light source unit 1 includes a holder 11, a coupling light source input unit 12, and a linear light source output unit 13. The coupling light source input portion 12 is mounted on the support 11 for delivering laser light to the linear light source output portion 13. The light source output unit 13 is mounted on the support 11 and converts the excitation light into a linear light source output. As shown in fig. 4 and 5, a powell prism 131 is provided in the linear light source output unit 13, and the powell prism 131 converts the excitation light into a linear light source 300. The powell prism 131, also called a laser line generator lens, is an optical scribing prism, and can optimally scribe a laser beam into a straight line with uniform optical density, good stability and good linearity after passing through the prism. The Bowell prism scribing mode is superior to that of a cylindrical lens, the central hot spot and the discolored edge distribution of a Gaussian beam can be eliminated, and a straight line with uniformly distributed energy is formed. As shown in fig. 6, when the gaussian laser beam passes through the cylindrical lens 132, a non-uniformly distributed straight line 500 is generated, while the top of the powell prism 131 is a complex two-dimensional aspheric surface, and when the laser beam passes through the complex two-dimensional aspheric surface, a large amount of spherical aberration is generated, and the optical path is redistributed to reduce the light in the central area and increase the light at the edge, so as to form a uniform straight line. Therefore, the Bawell prism is suitable for machine vision applications of various biomedicines, automobile assembly, food processing and the like.
Further, a filter section 4 is provided at the output end of the linear light source output section 12, and the filter section 4 filters the linear light output from the linear light source output section 12 to obtain excitation light having a pure spectrum. The error range is usually within plus or minus 10nm, and belongs to a pure spectrum. The filter 4 is formed by plating an optical absorption material on the surface of quartz glass. For example, a red filter may only pass red light, and so on. The refractive index of the quartz glass sheet is originally almost the same as that of air, all colored light can pass through the quartz glass sheet, and therefore the quartz glass sheet is transparent, but after the quartz glass sheet is coated with an optical absorption material, the passing of some light is changed. For example, a white light beam passes through a blue filter, and a blue light beam is emitted, while a little green light and a little red light are absorbed by the filter. The filter is used to filter out light in a certain wavelength range and acts as a monochromator. In the present embodiment, the optical shaping unit 2 is an optical lens. The optical lens may be provided with the above-described optical filter 4. The light filtering part filters light emitted by the printing ink on the valuable paper to be detected to obtain light with pure spectrum.
As shown in fig. 8a, 8b, the photoelectric conversion portion includes a mounting groove 31 and a strip window 32. The mounting groove 31 is a circular groove and is disposed toward the valuable document 200 to be detected, and the optical shaping unit 2 is mounted on the mounting groove 31. A strip-shaped window 32 is provided in the central portion of the mounting groove 31, the strip-shaped window 32 being parallel to the shape of the excitation light 300 emitted from the excitation light source section 1 and extending in the same direction. A line image detection unit is provided in the strip window 32 for photographing a pattern of the valuable document 200 to be detected. The linear array image detection unit is a linear array camera or a ci scanner. The core component in the line image detection unit is a line receiver, and in this embodiment, the line receiver may be any one of a VIS, NIR, or SWIR line receiver. The linear array camera has high light-emitting photosensitive intensity, can quickly acquire images, has high resolution of the acquired images, and can realize high-speed and high-resolution image detection.
The apparatus for detecting photoluminescence in a valuable document according to the present invention further includes an image processing unit (not shown). The image processing unit receives the image information of the valuable securities shot by the photoelectric conversion part, matches the image information of the preset template, judges the valuable securities as true valuable securities if the matching is passed, and judges the valuable securities as false valuable securities if the matching is not passed. In this embodiment, the image information acquired by the detection device is transmitted to the image processing unit through a standard interface such as ethernet or Camera Link. In order to improve the signal-to-noise ratio of the imaging image, the TDI technology can be adopted to carry out optimization design on the detection unit. The design improves the processing speed of the image, immediately improves the image detection speed, and realizes high-speed image detection.
Besides, the detection device for the photoluminescence of the valuable paper is also provided with an electric control part which carries out closed-loop control management on the brightness of the light source so as to keep the constant brightness at preset working parameters.
The following will explain in detail the specific process of detecting the authenticity of the valuable documents by using the photoluminescent detection device of the valuable documents.
S1: placing an opening part of a detection device for photoluminescence of the valuable securities above the valuable securities to be detected;
s2: the exciting light source part converts exciting light into a linear light source, irradiates on the negotiable securities to be detected and is used for exciting ink on the negotiable securities to be detected to emit light;
s3: an optical shaping section that receives light emitted from ink on a document of value to be detected;
s4: the photoelectric conversion part acquires an image of an excited linear region of the valuable paper to be detected;
s5: moving the negotiable securities to be detected along a preset direction;
s6: repeating the steps of S2-S5 until the photoelectric conversion portion acquires a complete image of the document of value to be detected as shown in FIG. 9;
s7: the photoelectric conversion part transmits the acquired image of the negotiable securities to be detected to the image processing unit;
s8: the image processing unit matches the image of the negotiable securities with the image information of a preset template, if the matching is passed, the negotiable securities are judged to be true negotiable securities, otherwise, the negotiable securities are judged to be false negotiable securities.
In this embodiment, high-brightness light sources such as LEDs and LDs are used. The high-energy light source is suitable for rapidly generating photoluminescence, and the condition that the photoluminescence cannot be detected due to insufficient brightness can not occur. Therefore, high-speed image detection can be realized. For example, the LD output optical power reaches 50W.
In this embodiment, taking the fluorescent ink as an example, when the optical characteristics of the valuable paper are detected, if ultraviolet light with a wavelength range of 200nm to 450nm is irradiated on the pattern printed by the fluorescent ink, preferably, ultraviolet light with a wavelength of 350nm is used for irradiation, the fluorescent ink on the valuable paper is excited to emit light visible to the naked eye, and the authenticity of the valuable paper can be determined by judging the characteristics of the light. The invention relates to a detecting device for photoluminescence of negotiable securities, which carries out anti-counterfeiting detection based on the phenomenon.
In summary, compared with the prior art, the detection device and the detection method for photoluminescence of the valuable documents integrate the excitation light source part, the optical shaping part and the photoelectric conversion part into one device, so that the detection device and the detection method are suitable for automatic detection of various valuable documents, improve the detection efficiency and reduce the detection cost; by optimizing the light path design and adopting the design of a high-brightness light source, a Bowell prism, a linear array image detection unit and the like, the high-speed and high-resolution image detection is realized.
The present invention has been described in detail. It will be apparent to those skilled in the art that any obvious modifications thereof can be made without departing from the spirit of the invention, which infringes the patent right of the invention and bears the corresponding legal responsibility.
Claims (13)
1. A detecting device for photoluminescence of negotiable securities is characterized by comprising an excitation light source part, an optical shaping part and a photoelectric conversion part,
the excitation light source part is arranged at the upper left of the negotiable securities to be detected and is used for emitting excitation light to the negotiable securities to be detected;
the optical shaping part is arranged at the upper right of the valuable paper to be detected and is used for receiving light emitted from the ink on the valuable paper to be detected;
the photoelectric conversion part is connected with the optical shaping part, is arranged above the excitation light source part and the optical shaping part, and is used for acquiring patterns of the valuable paper to be detected.
2. The apparatus for detecting photoluminescence in valuable documents as claimed in claim 1, wherein an angle between the excitation light emitted from the excitation light source section and the light emitted from the ink on the valuable document to be detected is greater than 0 ° and less than 90 °.
3. The apparatus for detecting photoluminescence in a security document of claim 1, wherein the excitation light source portion comprises a holder, a coupling light source input portion, and a line light source output portion,
the coupling light source input part is arranged on the bracket and used for transmitting laser to the linear light source output part;
the linear light source output part is arranged on the bracket, is connected with the output end of the coupling light source input part and is used for converting the exciting light transmitted from the coupling light source input part into a linear light source.
4. The apparatus for detecting photoluminescence in securities according to claim 3, wherein a Powell prism is built in the linear light source output portion, and the Powell prism converts excitation light into a linear light source.
5. The apparatus for detecting photoluminescence in a security document of claim 3, wherein the output end of the linear light source output portion is provided with a light filter portion, and the light filter portion filters the linear light source to obtain excitation light with pure spectrum.
6. The apparatus for detecting photoluminescence in a security document of value as claimed in claim 1, wherein said optical shaping portion is an optical lens.
7. The apparatus for detecting photoluminescence in a document of value as claimed in claim 1 or 6, wherein the optical shaping portion is provided with a light filter portion, and the light filter portion filters light emitted from ink on the document of value to be detected to obtain spectrally pure light.
8. The apparatus for detecting photoluminescence in a security document of value as claimed in claim 1, wherein said photoelectric conversion portion comprises a mounting groove and a strip window,
the mounting groove is a circular groove and is arranged towards the negotiable securities to be detected, the mounting groove is used for mounting the optical shaping part,
the strip-shaped window is arranged at the central part of the mounting groove, the shape of the strip-shaped window is parallel to that of exciting light emitted by the exciting light source part, the extending direction of the strip-shaped window is consistent, and a linear array image detection unit is arranged in the strip-shaped window and used for receiving light emitted by printing ink of valuable papers to be detected.
9. The apparatus for detecting photoluminescence in a security document of value as claimed in claim 8, wherein said line image detection unit is a line camera or a cis scanner.
10. A device for the detection of photoluminescence in documents of value as claimed in claim 8 or 9, wherein the line image detection unit comprises a line receiver, which is any one of a VIS, NIR or SWIR line receiver.
11. The apparatus for detecting photoluminescence in securities according to claim 1, further comprising an image processing unit, wherein the image processing unit receives the image information of the securities captured by the photoelectric conversion unit, matches the image information of the preset template, and determines that the securities are true securities if the matching is passed, and determines that the securities are false securities if the matching is not passed.
12. The apparatus for detecting photoluminescence in a security document of value as claimed in any one of claims 1 to 11, further comprising a case, wherein the excitation light source unit, the optical shaping unit and the photoelectric conversion unit are all built in the case.
13. A method for detecting photoluminescence in a document of value, using a device for detecting photoluminescence in a document of value according to any one of claims 1 to 12, comprising:
s1: placing an opening part of the photoluminescence detection device of the valuable paper above the valuable paper to be detected;
s2: the excitation light source part converts excitation light into a linear light source, irradiates on the negotiable securities to be detected and is used for exciting ink on the negotiable securities to be detected to emit light;
s3: the optical shaping part receives light emitted from ink on the valuable paper to be detected;
s4: the photoelectric conversion part acquires an image of an excited linear region of the valuable paper to be detected;
s5: the negotiable securities to be detected move along a preset direction;
s6: repeating the steps S2-S5 until the photoelectric conversion part obtains a complete image of the valuable paper to be detected;
s7: the photoelectric conversion part transmits the acquired image of the valuable paper to be detected to the image processing unit;
s8: and the image processing unit matches the image of the negotiable securities with the image information of the preset template, if the matching is passed, the negotiable securities are judged to be true negotiable securities, otherwise, the negotiable securities are judged to be false negotiable securities.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110775957.3A CN115601871A (en) | 2021-07-08 | 2021-07-08 | Detection device and detection method for photoluminescence of negotiable securities |
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| CN202110775957.3A CN115601871A (en) | 2021-07-08 | 2021-07-08 | Detection device and detection method for photoluminescence of negotiable securities |
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