CN107038794B - Method, device and equipment for identifying authenticity of paper money and storage medium - Google Patents
Method, device and equipment for identifying authenticity of paper money and storage medium Download PDFInfo
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- CN107038794B CN107038794B CN201710243266.2A CN201710243266A CN107038794B CN 107038794 B CN107038794 B CN 107038794B CN 201710243266 A CN201710243266 A CN 201710243266A CN 107038794 B CN107038794 B CN 107038794B
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Abstract
The embodiment of the invention discloses a method, a device, equipment and a storage medium for identifying the authenticity of paper money, wherein the method for identifying the authenticity of the paper money comprises the following steps: determining a gray reference value according to the pixel gray value of at least one preset reference area in the paper money to be detected; calculating the ratio of the pixel gray value of the preset contrast area of the paper money to be detected to the gray reference value; and determining the authenticity of the paper money to be detected according to the matching result of the ratio and the preset pixel comparison template. According to the technical scheme of the embodiment of the invention, the authenticity of the paper money to be detected is determined by acquiring the pixel gray value of the preset contrast area of the paper money to be detected and carrying out corresponding data processing, and the method has low requirement on hardware and is easy to realize.
Description
Technical Field
The embodiment of the invention relates to a paper money identification technology, in particular to a method, a device, equipment and a storage medium for identifying the authenticity of paper money.
Background
At present, all banks are equipped with cash recycling machines, and when a user deposits money, the cash recycling machines need to identify the true or false of the deposited paper money.
In the prior art, the authenticity of the paper currency is identified by identifying the special ink used at a fixed position on the paper currency, but in general, the printing area of the special ink on the paper currency is small, so that the difficulty of obtaining the characteristics of the special ink on the paper currency is increased, and on the other hand, the ultraviolet light emitting device is added due to the matching of the special ink required for identifying.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for identifying the authenticity of paper money, so as to realize simple and effective identification of the authenticity of the paper money and reduce hardware devices required to be configured.
In a first aspect, an embodiment of the present invention provides a method for identifying authenticity of a banknote, including:
determining a gray reference value according to the pixel gray value of at least one preset reference area in the paper money to be detected;
calculating the ratio of the pixel gray value of the preset contrast area of the paper money to be detected to the gray reference value;
and determining the authenticity of the paper money to be detected according to the matching result of the ratio and the preset pixel comparison template.
Further, the preset contrast area is a black watermark area.
Further, determining a gray reference value according to the pixel gray value of at least one preset reference area in the paper money to be detected comprises:
acquiring a pixel gray value of at least one preset reference area in the paper money to be detected;
and when the number of the pixel gray values of the preset reference area is more than one, calculating the average value of the pixel gray values of the preset reference area as the gray reference value.
Further, before determining the authenticity of the paper money to be detected according to the matching result of the ratio and the preset pixel comparison template, the method further comprises the following steps:
determining a template gray reference value according to the pixel gray value of at least one preset template reference area in the template paper money;
calculating a template ratio between the pixel gray value of a template paper money preset template comparison area and the template gray reference value;
determining the distribution proportion of the number of the templates in at least two preset ratio intervals;
and generating the preset pixel comparison template according to the template number distribution ratio and/or the arrangement position of the pixels of the preset template comparison area corresponding to each template ratio.
Further, determining the authenticity of the paper money to be detected according to the matching result of the ratio and the preset pixel comparison template comprises:
determining the quantity distribution proportion of the ratio in the at least two preset ratio intervals;
and determining the authenticity of the paper money to be detected according to the quantity distribution ratio and/or the matching result of the arrangement position of the pixels of the preset comparison area corresponding to each ratio and the preset pixel comparison template.
In a second aspect, an embodiment of the present invention further provides an apparatus for identifying authenticity of a banknote, including:
the gray reference value determining module is used for determining a gray reference value according to the pixel gray value of at least one preset reference area in the paper money to be detected;
the ratio calculation module is used for calculating the ratio between the pixel gray value of the preset contrast area of the paper money to be detected and the gray reference value;
and the paper currency authenticity determining module is used for determining the authenticity of the paper currency to be detected according to the matching result of the ratio and the preset pixel comparison template.
Further, the preset contrast area is a black watermark area.
Further, the gray reference value determining module includes:
the pixel gray value acquisition unit is used for acquiring the pixel gray value of at least one preset reference area in the paper money to be detected;
and the gray reference value calculating unit is used for calculating the average value of the pixel gray values of the preset reference area as the gray reference value when the number of the pixel gray values of the preset reference area is more than one.
Further, the apparatus for discriminating authenticity of a bill further comprises:
the template gray reference value determining module is used for determining a template gray reference value according to the pixel gray value of at least one preset template reference area in the template paper money;
the template ratio calculation module is used for calculating a template ratio between the pixel gray value of a template paper money preset template comparison area and the template gray reference value;
the template number distribution ratio determining module is used for determining the template number distribution ratio of the template ratio in at least two preset ratio intervals;
and the preset pixel comparison template generation module is used for generating the preset pixel comparison template according to the template number distribution proportion and/or the arrangement position of the pixels of the preset template comparison area corresponding to each template ratio.
Further, the banknote authenticity determination module includes:
a ratio distribution ratio determining unit, configured to determine a quantity distribution ratio of the ratio in the at least two preset ratio intervals;
and the banknote authenticity determining unit is used for determining the authenticity of the banknote to be detected according to the quantity distribution proportion and/or the matching result of the arrangement position of the pixels of the preset comparison area corresponding to each ratio and the preset pixel comparison template.
In a third aspect, an embodiment of the present invention further provides an apparatus, where the apparatus includes:
one or more processors;
storage means for storing one or more programs;
the image sensor is used for acquiring an image;
when executed by the one or more processors, cause the one or more processors to carry out a method of authenticating a banknote as described in the first aspect.
In a fourth aspect, the embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for authenticating a banknote according to the first aspect.
The invention determines the authenticity of the paper money to be detected by acquiring the pixel gray value of the preset contrast area of the paper money to be detected and carrying out corresponding data processing, solves the problem that an ultraviolet light source is required for identifying the authenticity of the paper money in the prior art, realizes the effect of reducing hardware for identifying the authenticity of the paper money and ensures that the authenticity identification of the paper money is easy to realize.
Drawings
FIG. 1 is a flow chart of a method for authenticating a banknote according to one embodiment of the present invention;
FIG. 2 is a flow chart of a method for identifying the authenticity of a banknote in a second embodiment of the invention;
FIG. 3 is a schematic structural diagram of an apparatus for discriminating authenticity of a banknote according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus in the fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a method for authenticating paper currency according to an embodiment of the present invention, where the embodiment is applicable to a cash recycling system for authenticating a deposited paper currency, the method may be implemented by a device for authenticating a paper currency, the device may be implemented by hardware and/or software, and the method for authenticating a paper currency specifically includes the following steps:
The preset reference area can be preset according to currency and face value, one or more preset areas can be selected, the preset reference area can be selected on the front and/or back of the paper currency, and an area without ink or with relatively less ink on the paper currency is usually selected as the preset reference area. When the authenticity of the paper money needs to be identified, the image of each preset reference area is obtained through the image sensor, and the pixel gray value corresponding to the pixel point in the image is calculated. Alternatively, when only one pixel gray value in one preset reference region is obtained, the pixel gray value is directly used as the gray reference value. Or, the number of the acquired pixel gray values of the preset reference region is more than one, the number of the pixel gray values in different preset gray value intervals can be counted according to the size of the pixel gray value, and the midpoint of the preset gray value interval containing the largest number of the pixel gray values is used as the template gray reference value. Or acquiring a pixel gray value of at least one preset reference area in the paper money to be detected; and when the number of the pixel gray values of the preset reference area is more than one, calculating the average value of the pixel gray values of the preset reference area as a gray reference value.
And 120, calculating the ratio of the pixel gray value of the preset contrast area of the paper money to be detected to the gray reference value.
The preset contrast area can be preset according to the currency and the face value, the preset contrast area can be selected on the front face and/or the back face of the paper money, the area with the printed patterns on the paper money is usually selected as the preset contrast area, optionally, the preset contrast area is a black watermark area, and correspondingly, the preset reference area can be selected as the area within the preset distance around the black watermark. When the authenticity of the paper money needs to be identified, the image of the preset contrast area is obtained through the image sensor, the image of the preset contrast area can be obtained and the image of the preset reference area can be obtained synchronously, the ratio between the pixel gray value corresponding to the pixel point in the image of the preset contrast area and the gray reference value is calculated, because the paper money has errors in the printing process, the exposure is different when the image of the paper money is obtained every time, the paper money can be stained in the circulation process, the normalization processing is carried out, and the influence caused by the factors can be reduced.
And step 130, determining the authenticity of the paper money to be detected according to the matching result of the ratio and the preset pixel comparison template.
The preset pixel comparison template can comprise a real coin preset pixel comparison template and/or a counterfeit coin preset pixel comparison template, the real coin preset pixel comparison template establishes a corresponding template according to a real coin, the counterfeit coin preset pixel comparison template establishes a corresponding template according to a counterfeit coin, the ratio can be respectively matched with the real coin preset pixel comparison template and the counterfeit coin preset pixel comparison template, when the ratio is successfully matched with a certain template, the authenticity of the paper money to be detected can be determined according to the authenticity of the paper money corresponding to the template successfully matched, or when the ratio is not successfully matched with the real coin preset pixel comparison template, the paper money to be detected is determined to be a counterfeit coin.
According to the technical scheme of the embodiment, the authenticity of the paper money to be detected is determined by obtaining the pixel gray value of the preset contrast area of the paper money to be detected and carrying out corresponding data processing, the problem that an ultraviolet light source is needed for identifying the authenticity of the paper money in the prior art is solved, hardware for identifying the authenticity of the paper money is reduced, and the effect of easily realizing the authenticity identification of the paper money is achieved.
Example two
Fig. 2 is a flowchart of a method for identifying authenticity of a banknote according to a second embodiment of the present invention, where the technical solution of this embodiment is further detailed on the basis of the above technical solution, and the method specifically includes:
And 120, calculating the ratio of the pixel gray value of the preset contrast area of the paper money to be detected to the gray reference value.
The template paper money is true money or false money, the image of the preset template reference area is obtained through the image sensor, and then the pixel gray value of the image of the preset template reference area is calculated. It should be noted that the preset template reference area selected from the template paper money and the preset reference area selected from the paper money to be tested are the same area on the paper money, and the manner of determining the template grayscale reference value is also the same as the manner of determining the grayscale reference value in the above technical solution.
And 150, calculating a template ratio between the pixel gray value of the template paper money preset template comparison area and the template gray reference value.
The preset template comparison area selected from the template paper money and the preset comparison area selected from the paper money to be detected are the same area on the paper money, and in the example, the preset template comparison area is a black watermark area. The image of the preset template comparison area is obtained through the image sensor, the image of the preset template comparison area and the image of the preset template reference area can be obtained synchronously, and the ratio between the pixel gray value corresponding to the pixel point in the image of the preset template comparison area and the template gray reference value is calculated.
And step 160, determining the distribution proportion of the number of the templates in the template ratio in at least two preset ratio intervals.
The template ratio is compared with the end point values of the preset ratio intervals, the preset ratio intervals to which the template ratios belong are determined, the number of the template ratios contained in each preset ratio interval is counted, and therefore the template number distribution proportion of the template ratios in at least two preset ratio intervals is determined.
And 170, generating a preset pixel comparison template according to the distribution proportion of the number of the templates and/or the arrangement position of the pixels of the preset template comparison area corresponding to the ratio of each template.
The arrangement position of the pixels of the preset template contrast area is the arrangement position of the pixels of the acquired image of the preset target contrast area in the image. The target ratio corresponding to each pixel may be configured into a matrix according to the arrangement position of the pixels of the image in the preset target contrast area in the image. And generating a preset pixel comparison template according to the number distribution proportion of the templates and/or the arrangement positions of the pixels of the preset template comparison area corresponding to the template ratios, wherein the preset pixel comparison template is used for matching the ratio of the paper money to be detected with the preset pixel comparison template when the authenticity of the paper money is identified.
Accordingly, step 130 includes:
and 131, determining the quantity distribution proportion of the ratio in at least two preset ratio intervals.
The ratio of the paper money to be detected is compared with the end point values of the preset ratio intervals, the preset ratio interval to which the ratio belongs is determined, the number of the ratios contained in each preset ratio interval is counted, and therefore the number distribution proportion of the ratios in at least two preset ratio intervals is determined.
And 132, determining the authenticity of the paper money to be detected according to the matching result of the arrangement position of the pixels of the preset comparison area corresponding to the quantity distribution ratio and/or each ratio and the preset pixel comparison template.
Matching the quantity distribution proportion with the template quantity distribution proportion in a preset pixel comparison template, and judging that the paper money to be detected and the template paper money are successfully matched in the quantity distribution proportion when the difference value between the quantity distribution proportion and the distribution proportion of the template quantity distribution in each preset ratio interval is smaller than a first threshold value; and when the ratio corresponding to the pixels of the preset contrast area and the template ratio of the pixels of the preset template contrast area arranged at the same position are different from each other by less than a second threshold value, judging that the pixels are matched, and when the proportion of the matched pixels in all the pixels is greater than or equal to a third threshold value, judging that the matching between the paper money to be detected and the template paper money is successful in the arrangement of the pixel positions. And when the two types of matching are successful or at least one type of matching is successful, the matching between the paper money to be detected and the template paper money is considered to be successful.
According to the technical scheme, the preset pixel comparison template is established according to the template paper money, and the authenticity of the paper money is identified by comparing the ratio of the paper money to be detected with the preset pixel comparison template.
EXAMPLE III
Fig. 3 is a schematic structural diagram of an apparatus for authenticating a banknote according to a third embodiment of the present invention, where the apparatus may be configured on a cash recycling machine. As shown in fig. 3, the apparatus 30 for discriminating the authenticity of a bill includes:
the gray reference value determining module 310 is configured to determine a gray reference value according to a pixel gray value of at least one preset reference area in the banknote to be detected;
the ratio calculation module 320 is used for calculating the ratio between the pixel gray value of the preset contrast area of the paper money to be detected and the gray reference value;
and the banknote authenticity determining module 330 is configured to determine authenticity of the banknote to be detected according to a matching result of the ratio and the preset pixel comparison template.
Optionally, the preset contrast area is a black watermark area.
Further, the gray reference value determining module 310 includes:
the pixel gray value acquisition unit is used for acquiring the pixel gray value of at least one preset reference area in the paper money to be detected;
and the gray reference value calculating unit is used for calculating the average value of the pixel gray values of the preset reference area as the gray reference value when the number of the pixel gray values of the preset reference area is more than one.
Further, the apparatus 30 for discriminating the authenticity of a bill further includes:
the template gray reference value determining module is used for determining a template gray reference value according to the pixel gray value of at least one preset template reference area in the template paper money;
the template ratio calculation module is used for calculating a template ratio between the pixel gray value of the template paper money preset template comparison area and the template gray reference value;
the template number distribution ratio determining module is used for determining the template number distribution ratio of the template ratio in at least two preset ratio intervals;
and the preset pixel comparison template generation module is used for generating a preset pixel comparison template according to the template number distribution ratio and/or the arrangement position of the pixels of the preset template comparison area corresponding to each template ratio.
Further, the banknote authenticity determination module 330 includes:
the ratio distribution proportion determining unit is used for determining the quantity distribution proportion of the ratio in at least two preset ratio intervals;
and the banknote authenticity determining unit is used for determining the authenticity of the banknote to be detected according to the matching result of the arrangement position of the pixels of the preset comparison area corresponding to the number distribution proportion and/or each ratio and the preset pixel comparison template.
According to the technical scheme of the embodiment, the authenticity of the paper money to be detected is determined by obtaining the pixel gray value of the preset contrast area of the paper money to be detected and carrying out corresponding data processing, the problem that an ultraviolet light source is needed for identifying the authenticity of the paper money in the prior art is solved, hardware for identifying the authenticity of the paper money is reduced, and the effect of easily realizing the authenticity identification of the paper money is achieved.
The product can execute the method provided by any embodiment one and embodiment two of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 4 is a schematic structural diagram of an apparatus according to a fourth embodiment of the present invention, as shown in fig. 4, the apparatus includes a processor 410, a memory 420, an image sensor 430, an input device 440, and an output device 450; the number of the processors 410 in the device may be one or more, and one processor 410 is taken as an example in fig. 4; the processor 410, the memory 420, the image sensor 430, the input device 440, and the output device 450 may be connected by a bus or other means, as exemplified by the bus connection in fig. 4.
The memory 420 serves as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the method for authenticating a bill in an embodiment of the present invention (e.g., the gray reference value determining module 310, the ratio calculating module 320, and the bill authenticity determining module 330 in the apparatus for authenticating a bill). The processor 410 executes various functional applications of the device and data processing by executing software programs, instructions and modules stored in the memory 420, so as to realize the method for authenticating the banknote.
The memory 420 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 420 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 420 may further include memory located remotely from the processor 410, which may be connected to the device/terminal/server via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The image Sensor 430 may be a CCD (Charge-coupled Device), a CMOS (Complementary Metal Oxide Semiconductor), a CIS (contact image Sensor), or other sensors for acquiring an image.
The input device 440 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the apparatus. The output device 450 may include a display device such as a display screen.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the computer-executable instructions are executed by a computer processor to perform a method for authenticating a banknote, and the method includes:
determining a gray reference value according to the pixel gray value of at least one preset reference area in the paper money to be detected;
calculating the ratio of the pixel gray value of the preset contrast area of the paper money to be detected to the gray reference value;
and determining the authenticity of the paper money to be detected according to the matching result of the ratio and the preset pixel comparison template.
Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the operations of the method described above, and may also perform related operations in the method for authenticating a banknote provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the above search apparatus, each included unit and module are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method of authenticating a banknote comprising:
determining a gray reference value according to the pixel gray value of at least one preset reference area in the paper money to be detected;
calculating the ratio of the pixel gray value of the preset contrast area of the paper money to be detected to the gray reference value;
determining a template gray reference value according to the pixel gray value of at least one preset template reference area in the template paper money;
calculating a template ratio between the pixel gray value of a template paper money preset template comparison area and the template gray reference value;
determining the distribution proportion of the number of the templates in at least two preset ratio intervals;
generating a preset pixel comparison template according to the template number distribution proportion and/or the arrangement position of the pixels of the preset template comparison area corresponding to each template ratio;
and determining the authenticity of the paper money to be detected according to the matching result of the ratio and the preset pixel comparison template.
2. The method of claim 1, wherein:
the preset contrast area is a black watermark area.
3. The method according to claim 1, wherein the determining of the grey reference value according to the grey value of the pixels of at least one preset reference area of the banknote to be tested comprises:
acquiring a pixel gray value of at least one preset reference area in the paper money to be detected;
and when the number of the pixel gray values of the preset reference area is more than one, calculating the average value of the pixel gray values of the preset reference area as the gray reference value.
4. The method according to claim 1, wherein determining the authenticity of the banknote to be tested according to the matching result of the ratio and the preset pixel comparison template comprises:
determining the quantity distribution proportion of the ratio in the at least two preset ratio intervals;
and determining the authenticity of the paper money to be detected according to the quantity distribution ratio and/or the matching result of the arrangement position of the pixels of the preset comparison area corresponding to each ratio and the preset pixel comparison template.
5. An apparatus for discriminating between genuineness of a bill, comprising:
the gray reference value determining module is used for determining a gray reference value according to the pixel gray value of at least one preset reference area in the paper money to be detected;
the ratio calculation module is used for calculating the ratio between the pixel gray value of the preset contrast area of the paper money to be detected and the gray reference value;
the template gray reference value determining module is used for determining a template gray reference value according to the pixel gray value of at least one preset template reference area in the template paper money;
the template ratio calculation module is used for calculating a template ratio between the pixel gray value of a template paper money preset template comparison area and the template gray reference value;
the template number distribution ratio determining module is used for determining the template number distribution ratio of the template ratio in at least two preset ratio intervals;
the preset pixel comparison template generation module is used for generating a preset pixel comparison template according to the template number distribution proportion and/or the arrangement position of the pixels of the preset template comparison area corresponding to each template ratio;
and the paper currency authenticity determining module is used for determining the authenticity of the paper currency to be detected according to the matching result of the ratio and the preset pixel comparison template.
6. The apparatus of claim 5, wherein:
the preset contrast area is a black watermark area.
7. The apparatus of claim 5, wherein the gray reference value determining module comprises:
the pixel gray value acquisition unit is used for acquiring the pixel gray value of at least one preset reference area in the paper money to be detected;
and the gray reference value calculating unit is used for calculating the average value of the pixel gray values of the preset reference area as the gray reference value when the number of the pixel gray values of the preset reference area is more than one.
8. The apparatus according to claim 5, wherein the bill authenticity determination module includes:
a ratio distribution ratio determining unit, configured to determine a quantity distribution ratio of the ratio in the at least two preset ratio intervals;
and the banknote authenticity determining unit is used for determining the authenticity of the banknote to be detected according to the quantity distribution proportion and/or the matching result of the arrangement position of the pixels of the preset comparison area corresponding to each ratio and the preset pixel comparison template.
9. An apparatus for authenticating a banknote, the apparatus comprising:
one or more processors;
storage means for storing one or more programs;
the image sensor is used for acquiring an image;
when executed by the one or more processors, cause the one or more processors to implement a method of authenticating a banknote as claimed in any one of claims 1 to 4.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, carries out a method of authenticating banknotes according to any one of claims 1 to 4.
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| CN107958531B (en) * | 2017-12-06 | 2020-08-18 | 深圳怡化电脑股份有限公司 | Paper money identification method and device and equipment |
| CN108198325B (en) * | 2018-01-25 | 2019-10-11 | 深圳怡化电脑股份有限公司 | Technique of composite-RMB bank note detection method, device and storage medium |
| CN110378351B (en) * | 2019-07-26 | 2021-11-26 | 中国工商银行股份有限公司 | Seal identification method and device |
| CN110867015A (en) * | 2019-09-29 | 2020-03-06 | 广州国瀚计算机通讯科技有限公司 | RMB counterfeit discriminating method |
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| JP5897090B2 (en) * | 2013-10-22 | 2016-03-30 | キヤノン・コンポーネンツ株式会社 | Image sensor unit, image reading device, and paper sheet identification device |
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