CN108074324B - Paper money counterfeit distinguishing method and device - Google Patents
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- CN108074324B CN108074324B CN201611036893.0A CN201611036893A CN108074324B CN 108074324 B CN108074324 B CN 108074324B CN 201611036893 A CN201611036893 A CN 201611036893A CN 108074324 B CN108074324 B CN 108074324B
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Abstract
The invention belongs to the field of paper money detection, and provides a paper money counterfeit distinguishing method and a device, wherein the paper money counterfeit distinguishing method comprises the following steps: identifying whether the paper money is spliced paper money or not; if so, performing pixel quantity matching judgment on the image corresponding to the paper currency based on a first pixel matching threshold value to determine the authenticity of the paper currency; if not, performing pixel quantity matching on the image corresponding to the paper currency based on a second pixel matching threshold value to determine the authenticity of the paper currency; wherein the first pixel matching threshold is greater than the second pixel matching threshold. According to the invention, the first pixel matching threshold value and the second pixel matching threshold value are set, the first pixel matching threshold value is larger than the second pixel matching threshold value, when the paper money is identified as spliced paper money, the paper money is identified based on the first pixel matching threshold value, when the paper money is identified as non-spliced paper money, the paper money is identified based on the first pixel matching threshold value, different threshold values are used for identifying the spliced paper money and the non-spliced paper money, and the identification accuracy of the paper money identification is improved.
Description
Technical Field
The invention belongs to the technical field of paper money detection, and particularly relates to a paper money counterfeit distinguishing method and device.
Background
With the rapid development of national economy, the issue volume and the throughput of the RMB increase year by year, but in daily life, two genuine banknotes are spliced together for use due to partial defect of the banknotes.
In the existing method for identifying counterfeit paper money, a counterfeit threshold is preset for identifying the counterfeit paper money, and the existing counterfeit threshold is usually determined by experience, but when the counterfeit threshold is too high in the process of identifying the counterfeit paper money, the genuine paper money is mistakenly identified as counterfeit paper money, and when the counterfeit threshold is too low, the counterfeit paper money is mistakenly identified as the genuine paper money. Therefore, the prior art has the problem of low identification accuracy when the paper money is identified.
Disclosure of Invention
The invention provides a paper money counterfeit distinguishing method and device, and aims to solve the problem that in the prior art, the recognition accuracy rate is low when paper money is distinguished.
The invention provides a paper money counterfeit discriminating method, which comprises the following steps:
identifying whether the paper money is spliced paper money or not;
if so, performing pixel quantity matching judgment on the image corresponding to the paper currency based on a first pixel matching threshold value to determine the authenticity of the paper currency;
if not, performing pixel quantity matching on the image corresponding to the paper currency based on a second pixel matching threshold value to determine the authenticity of the paper currency;
wherein the first pixel matching threshold is greater than the second pixel matching threshold.
The invention also provides a paper money counterfeit discriminating device, which comprises:
the identification module is used for identifying whether the paper money is spliced paper money or not;
the first counterfeit detection module is used for carrying out pixel quantity matching judgment on the image corresponding to the paper money based on a first pixel matching threshold value so as to determine the authenticity of the paper money when the paper money is identified as spliced paper money;
the second counterfeit distinguishing module is used for matching the number of pixels of the image corresponding to the paper money based on a second pixel matching threshold value to determine the authenticity of the paper money when the paper money is identified as the non-spliced paper money;
wherein the first pixel matching threshold is greater than the second pixel matching threshold.
According to the invention, the first pixel matching threshold value and the second pixel matching threshold value are set, and the first pixel matching threshold value is larger than the second pixel matching threshold value, when the paper money is identified as spliced paper money, the image of the paper money is subjected to pixel quantity matching based on the first pixel matching threshold value to identify the paper money, and when the paper money is identified as non-spliced paper money, the image of the paper money is subjected to pixel quantity matching based on the first pixel matching threshold value to identify the paper money, so that the different pixel matching threshold values can be used for identifying the spliced paper money and the non-spliced paper money, and the identification accuracy of the paper money identification is improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
FIG. 1 is a flow chart of a method for identifying counterfeit paper money according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a banknote authentication device according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a paper money counterfeit discrimination method and device for improving the recognition accuracy of the paper money counterfeit discrimination, wherein a first pixel matching threshold value and a second pixel matching threshold value are mainly set, the first pixel matching threshold value is larger than the second pixel matching threshold value, when the paper money is recognized to be spliced, the image of the paper money is subjected to pixel quantity matching based on the first pixel matching threshold value to counterfeit the paper money, when the paper money is recognized to be non-spliced, the image of the paper money is subjected to pixel quantity matching based on the first pixel matching threshold value to counterfeit the paper money, different pixel matching threshold values are used for counterfeit the spliced paper money and the non-spliced paper money, and therefore the recognition accuracy of the counterfeit paper money is improved.
To specifically describe the above method and apparatus for identifying counterfeit paper money, the following detailed description is made with reference to specific embodiments:
the first embodiment is as follows:
fig. 1 shows a flow of implementing a banknote authentication method according to a first embodiment of the present invention, and for convenience of description, only the relevant parts of the embodiment are shown, which are detailed as follows:
in step S101, whether the banknote is a spliced banknote is identified.
Specifically, step S101 includes the following steps:
acquiring a horizontal crown word number and a vertical crown word number of the paper money;
judging whether the transverse crown word number is consistent with the vertical crown word number;
if so, determining that the paper money is non-spliced paper money;
if not, determining the paper money as spliced paper money.
It should be noted that the crown word number refers to the code on the paper money of the RMB, wherein, the crown word is two or three English letters printed on the paper money for marking the printing batch, and the two or three English letters are arranged and printed by a bank note printer according to a certain rule; the number is an Arabic numeral serial number printed behind the crown word and used for indicating the arrangement sequence of each banknote in the same crown word batch. When the horizontal crown word number of the paper money is consistent with the vertical crown word number, the paper money can be confirmed to be not spliced, and when the horizontal crown word number of the paper money is inconsistent with the vertical crown word number, the paper money can be confirmed to be not spliced.
In step S102, if yes, a pixel number matching judgment is performed on the image corresponding to the banknote based on the first pixel matching threshold value to determine authenticity of the banknote.
When the paper currency is recognized as spliced paper currency, the counterfeit paper currency needs to be identified by adopting a requirement with a high matching degree, namely, the image corresponding to the paper currency is subjected to pixel quantity matching judgment based on a first pixel matching threshold value so as to determine the authenticity of the paper currency. The first pixel matching threshold is the minimum pixel quantity required to be matched when the image corresponding to the paper currency is subjected to pixel quantity matching and can be identified as a true paper currency under the condition that the paper currency is spliced.
Specifically, the step S102 of performing pixel number matching judgment on the image corresponding to the banknote based on the first pixel matching threshold to determine authenticity of the banknote includes:
acquiring images of the paper money and obtaining corresponding paper money images;
judging whether the number of matched pixels between the paper money image and the preset template image is greater than a first pixel matching threshold value or not;
if yes, determining the paper money as true paper money;
if not, determining the paper money as false paper money.
Further, the above image obtaining of the banknote and obtaining of the corresponding banknote image specifically include:
and acquiring the whole or local characteristics of the paper money to obtain a paper money image corresponding to the whole or local characteristics of the paper money.
Here, it should be noted that: the method comprises the steps of obtaining a banknote image corresponding to the whole or local features of a banknote by obtaining the whole or local feature image of the banknote, judging whether the number of matched pixels between the banknote image and a preset template image is larger than a first pixel matching threshold value, determining the banknote to be a true banknote if the judgment result is yes, and determining the banknote to be a false banknote if the judgment result is not. The preset template image is a preset real banknote template image used for performing pixel matching judgment on the acquired banknote image.
In step S103, if not, the image corresponding to the banknote is subjected to pixel number matching based on the second pixel matching threshold to determine authenticity of the banknote. Wherein the first pixel matching threshold is greater than the second pixel matching threshold.
When the paper money is identified to be the non-spliced paper money, the counterfeit money is identified by adopting the requirement of low matching degree, namely, the image corresponding to the paper money is subjected to pixel quantity matching judgment based on the second pixel matching threshold value so as to determine the authenticity of the paper money. The second pixel matching threshold is the minimum pixel quantity required to be matched when the image corresponding to the paper currency is subjected to pixel quantity matching and can be identified as a true paper currency under the condition that the paper currency is not spliced.
Specifically, the step S103 of performing pixel number matching judgment on the image corresponding to the banknote based on the second pixel matching threshold to determine authenticity of the banknote includes:
acquiring images of the paper money and obtaining corresponding paper money images;
judging whether the number of matched pixels between the paper money image and the preset template image is greater than a second pixel matching threshold value or not;
if yes, determining the paper money as true paper money;
if not, determining the paper money as false paper money.
Further, the above image obtaining of the banknote and obtaining of the corresponding banknote image specifically include:
and acquiring the whole or local characteristics of the paper money to obtain a paper money image corresponding to the whole or local characteristics of the paper money.
Here, it should be noted that: the method comprises the steps of obtaining a banknote image corresponding to the whole or local features of the banknote by obtaining the whole or local feature image of the banknote, judging whether the number of matched pixels between the banknote image and a preset template image is larger than a second pixel matching threshold value, determining that the banknote is a true banknote if the judgment result is yes, and determining that the banknote is a false banknote if the judgment result is not. The preset template image is a preset real banknote template image used for performing pixel matching judgment on the acquired banknote image.
In this embodiment, when the whole or local features of the banknote are obtained to obtain a banknote image corresponding to the whole or local features of the banknote, the local features may be white watermarks or other feature portions on the banknote. For example: and acquiring the white watermark part of the paper currency, wherein the obtained paper currency image is the white watermark image.
The paper currency counterfeit distinguishing method provided by the embodiment of the invention is characterized in that a first pixel matching threshold and a second pixel matching threshold are set, the first pixel matching threshold is larger than the second pixel matching threshold, when the paper currency is recognized to be spliced, a whole or local characteristic image of the paper currency is obtained to obtain a paper currency image corresponding to the whole or local characteristic of the paper currency, whether the number of matched pixels between the paper currency image and a preset template image is larger than the first pixel matching threshold is judged, if the judgment result is yes, the paper currency is determined to be true, if the judgment result is not, the paper currency is determined to be counterfeit, when the paper currency is recognized to be non-spliced, the whole or local characteristic image of the paper currency is obtained to obtain the paper currency image corresponding to the whole or local characteristic of the paper currency, and whether the number of matched pixels between the paper currency image and the preset template image is larger than the second pixel matching threshold is judged, and if the judgment result is yes, determining that the paper currency is a true paper currency, and if the judgment result is no, determining that the paper currency is a false paper currency, and carrying out false identification on spliced paper currency and non-spliced paper currency by using different pixel matching threshold values, so that the identification accuracy of the false identification of the paper currency is improved.
Example two:
in order to implement the method for identifying counterfeit paper money as shown in fig. 1 in the first embodiment of the present invention, the present embodiment provides a device for identifying counterfeit paper money. Fig. 2 shows the structure of the paper money discriminating apparatus, and for convenience of explanation, only the parts related to the present embodiment are shown, which will be described in detail as follows:
the paper money discriminating apparatus 20 includes a recognition module 201, a first discriminating module 202, and a second discriminating module 203.
The identification module 201 is used for identifying whether the paper money is spliced.
The first counterfeit detection module 202 is configured to perform pixel number matching judgment on an image corresponding to a banknote based on a first pixel matching threshold value to determine authenticity of the banknote when the banknote is recognized as a spliced banknote.
The second counterfeit detection module 203 is configured to perform pixel quantity matching on the image corresponding to the banknote based on the second pixel matching threshold value to determine authenticity of the banknote when the banknote is identified as the non-spliced banknote. Wherein the first pixel matching threshold is greater than the second pixel matching threshold.
Specifically, the identification module 201 includes:
the serial number acquisition module is used for acquiring the transverse serial number and the vertical serial number of the paper money;
the crown word number judging module is used for judging whether the transverse crown word number is consistent with the vertical crown word number or not;
the spliced banknote judging module is used for determining that the banknote is a non-spliced banknote when the transverse crown word number is consistent with the vertical crown word number; and when the transverse crown word number is not consistent with the vertical crown word number, determining the paper money as spliced paper money.
Specifically, the first authentication module 202 includes:
the paper money image acquisition module is used for acquiring images of paper money and obtaining corresponding paper money images;
the first judging module is used for judging whether the number of matched pixels between the paper money image and the preset template image is greater than a first pixel matching threshold value or not; if yes, determining the paper money as true paper money; if not, determining the paper money as false paper money.
Specifically, the second authentication module 203 comprises:
the paper money image acquisition module is used for acquiring images of paper money and obtaining corresponding paper money images;
the second judging module is used for judging whether the number of matched pixels between the paper money image and the preset template image is greater than a second pixel matching threshold value or not; if yes, determining the paper money as true paper money; if not, determining the paper money as false paper money.
The banknote image acquiring module is specifically configured to acquire an image of the whole or local features of the banknote to obtain a banknote image corresponding to the whole or local features of the banknote.
It will be clear to those skilled in the art that, for convenience and simplicity of description, the above-mentioned division of the functional modules is merely illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the banknote counterfeit detection device is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional modules are only used for distinguishing one functional module from another, and are not used for limiting the protection scope of the application. For the specific working process of the module in the financial transaction device, reference may be made to the corresponding process in the first method embodiment, which is not described herein again.
It should be noted that, since the banknote authentication device provided in the embodiment of the present invention is based on the same concept as the method embodiment shown in fig. 1 of the present invention, the technical effect thereof is the same as the method embodiment shown in fig. 1 of the present invention, and specific contents thereof can be referred to the description of the method embodiment shown in fig. 1 of the present invention, and are not repeated herein.
Therefore, the paper currency false distinguishing device that this embodiment provided can be equally through setting up first pixel matching threshold and second pixel matching threshold, and first pixel matching threshold is greater than second pixel matching threshold, when discerning paper currency for the concatenation paper currency, carry out the pixel quantity matching to paper currency to distinguish false based on the image of first pixel matching threshold to paper currency, when discerning paper currency for non-concatenation paper currency, carry out the pixel quantity matching to the image of paper currency to distinguish false to paper currency based on first pixel matching threshold, thereby can use different threshold to distinguish false to concatenation paper currency and non-concatenation paper currency, thereby improve the discernment accuracy of paper currency false distinguishing.
It will be further understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent alternatives or obvious modifications, all of which have the same properties or uses, without departing from the spirit of the invention, should be considered as falling within the scope of the invention as defined by the appended claims.
Claims (10)
1. A paper currency identification method is characterized by comprising the following steps:
identifying whether the paper money is spliced paper money or not;
if so, performing pixel quantity matching judgment on the image corresponding to the paper currency based on a first pixel matching threshold value to determine the authenticity of the paper currency, wherein the first pixel matching threshold value is the minimum pixel quantity which is required to be matched when the image of the paper currency is subjected to pixel quantity matching and can be identified as true paper currency under the condition that the paper currency is spliced;
if not, performing pixel quantity matching on the image corresponding to the paper currency based on a second pixel matching threshold value to determine the authenticity of the paper currency, wherein the second pixel matching threshold value is the minimum pixel quantity which is required to be matched when the image of the paper currency is subjected to pixel quantity matching and can be identified as true paper currency under the condition that the paper currency is not spliced;
wherein the first pixel matching threshold is greater than the second pixel matching threshold.
2. The method of claim 1, wherein the identifying whether the banknote is a spliced banknote comprises:
acquiring a transverse crown word number and a vertical crown word number of the paper money;
judging whether the transverse crown word number is consistent with the vertical crown word number;
if so, determining that the paper money is non-spliced paper money;
if not, determining the paper money as spliced paper money.
3. The method for authenticating the paper currency according to claim 1, wherein the judging of the authenticity of the paper currency by performing pixel number matching on the image corresponding to the paper currency based on the first pixel matching threshold value comprises:
acquiring images of the paper money and obtaining corresponding paper money images;
judging whether the number of matched pixels between the banknote image and a preset template image is greater than the first pixel matching threshold value or not;
if yes, determining that the paper money is true paper money;
if not, determining that the paper money is false paper money.
4. The method for authenticating the paper currency according to claim 1, wherein the judging of the authenticity of the paper currency by performing pixel number matching on the image corresponding to the paper currency based on the second pixel matching threshold value comprises:
acquiring images of the paper money and obtaining corresponding paper money images;
judging whether the number of matched pixels between the banknote image and a preset template image is greater than the second pixel matching threshold value or not;
if yes, determining that the paper money is true paper money;
if not, determining that the paper money is false paper money.
5. The method according to claim 3 or 4, wherein the image obtaining of the banknote and the corresponding image of the banknote comprises:
and acquiring the whole or local characteristics of the paper money to obtain a paper money image corresponding to the whole or local characteristics of the paper money.
6. A paper money discriminating apparatus, characterized by comprising:
the identification module is used for identifying whether the paper money is spliced paper money or not;
the first false distinguishing module is used for carrying out pixel quantity matching judgment on an image corresponding to the paper currency based on a first pixel matching threshold value to determine the authenticity of the paper currency when the paper currency is identified as spliced paper currency, wherein the first pixel matching threshold value is the minimum pixel quantity which is required to be matched when the image of the paper currency is subjected to pixel quantity matching and can be identified as true paper currency under the condition that the paper currency is the spliced paper currency;
the second false distinguishing module is used for matching the number of pixels of the image corresponding to the paper currency based on a second pixel matching threshold value to determine the authenticity of the paper currency when the paper currency is identified as non-spliced paper currency, wherein the second pixel matching threshold value is the minimum number of pixels which are required to be matched when the image of the paper currency is matched in number of pixels and can be identified as true paper currency under the condition that the paper currency is not spliced paper currency;
wherein the first pixel matching threshold is greater than the second pixel matching threshold.
7. The paper money discriminating apparatus as claimed in claim 6, wherein the recognition module comprises:
the serial number acquisition module is used for acquiring the transverse serial number and the vertical serial number of the paper money;
the crown word number judging module is used for judging whether the transverse crown word number is consistent with the vertical crown word number or not;
the spliced banknote judging module is used for determining that the banknote is a non-spliced banknote when the transverse crown word number is consistent with the vertical crown word number; and when the transverse crown word number is not consistent with the vertical crown word number, determining the paper money to be spliced.
8. The banknote authentication device according to claim 6, wherein the first authentication module comprises:
the paper money image acquisition module is used for acquiring images of the paper money and obtaining corresponding paper money images;
the first judging module is used for judging whether the number of matched pixels between the paper money image and a preset template image is greater than the first pixel matching threshold value or not; if yes, determining that the paper money is true paper money; if not, determining that the paper money is false paper money.
9. The banknote discriminating device as claimed in claim 6, wherein the second discriminating module comprises:
the paper money image acquisition module is used for acquiring images of the paper money and obtaining corresponding paper money images;
the second judging module is used for judging whether the number of matched pixels between the paper money image and a preset template image is greater than the second pixel matching threshold value or not; if yes, determining that the paper money is true paper money; if not, determining that the paper money is false paper money.
10. The banknote authentication device according to claim 8 or 9, wherein the matching image obtaining module is specifically configured to:
and acquiring the whole or local characteristics of the paper money to obtain a paper money image corresponding to the whole or local characteristics of the paper money.
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| DE102010021803A1 (en) * | 2010-05-27 | 2011-12-01 | Giesecke & Devrient Gmbh | Apparatus for checking the authenticity of documents of value |
| CN104778778B (en) * | 2015-03-23 | 2017-12-08 | 深圳怡化电脑股份有限公司 | A kind of banknote detection method and system |
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| CN1653479A (en) * | 2002-03-11 | 2005-08-10 | 数字验证有限公司 | Currency verification |
| WO2007011187A1 (en) * | 2005-07-21 | 2007-01-25 | Seetech Co., Ltd. | Method and apparatus for recognizing denomination of paper money |
| KR20090060004A (en) * | 2007-12-07 | 2009-06-11 | 엘지엔시스(주) | Apparatus and method for medium recognition, auto teller machine |
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