CN106373255B - A kind of paper money discrimination method and device - Google Patents
A kind of paper money discrimination method and device Download PDFInfo
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- CN106373255B CN106373255B CN201610834871.2A CN201610834871A CN106373255B CN 106373255 B CN106373255 B CN 106373255B CN 201610834871 A CN201610834871 A CN 201610834871A CN 106373255 B CN106373255 B CN 106373255B
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- characteristic area
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- change interval
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- 238000012850 discrimination method Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000002845 discoloration Methods 0.000 claims description 46
- 230000001419 dependent effect Effects 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/20—Testing patterns thereon
- G07D7/2016—Testing patterns thereon using feature extraction, e.g. segmentation, edge detection or Hough-transformation
Abstract
The embodiment of the invention discloses a kind of paper money discrimination method and devices.The described method includes: obtaining the infrared external reflection figure to false distinguishing bank note；According to the default characteristic area to the corresponding genuine note of false distinguishing bank note, corresponding characteristic area in the infrared external reflection figure is determined；Obtain the pixel value of pixel in the characteristic area；The display feature of the characteristic area is determined according to the pixel value；False distinguishing is carried out to false distinguishing bank note to described according to the display feature.The display feature of corresponding each characteristic area is recognized in infrared external reflection figure of the embodiment of the present invention by treating false distinguishing bank note, false distinguishing is carried out to treat false distinguishing bank note, solve the problems, such as that false distinguishing result is undesirable in the prior art, improves the accuracy of paper money discrimination result.
Description
Technical field
The present embodiments relate to bank note inspection technology field more particularly to a kind of paper money discrimination method and devices.
Background technique
The presence and sprawling of counterfeit money are that people's lives bring adverse effect, more bring prestige to financial circles safe operation
The side of body, the normal economic order of interference country.
Existing frequently-used method is to carry out false distinguishing, such as benefit to bank note using the security feature under visible light or under ultraviolet light
The true and false of detection bank note is carried out with features such as bank note size, watermark, safety line or fluorescent characteristics.
But when the corresponding device of these methods is integrated in finance device, bank note is examined using these methods
It tests, often occurs detecting the unstable problem of feature, sometimes even genuine note, can not also detect accurately as a result, leading to false distinguishing
As a result undesirable.
Summary of the invention
The embodiment of the present invention provides a kind of paper money discrimination method and device, to improve the accuracy of false distinguishing result.
In a first aspect, the embodiment of the invention provides a kind of paper money discrimination methods, this method comprises:
Obtain the infrared external reflection figure to false distinguishing bank note；According to the default characteristic area to the corresponding genuine note of false distinguishing bank note
Domain determines corresponding characteristic area in the infrared external reflection figure；Obtain the pixel value of pixel in the characteristic area；According to institute
State the display feature that pixel value determines the characteristic area；False distinguishing is carried out to false distinguishing bank note to described according to the display feature.
Second aspect, the embodiment of the invention also provides a kind of paper money discrimination device, which includes:
Infrared external reflection figure obtains module, for obtaining the infrared external reflection figure to false distinguishing bank note；Characteristic area determining module is used
According to the default characteristic area to the corresponding genuine note of false distinguishing bank note, corresponding characteristic area in the infrared external reflection figure is determined
Domain；Pixel value obtains module, for obtaining the pixel value of pixel in the characteristic area；It shows characteristic determination module, is used for
The display feature of the characteristic area is determined according to the pixel value；Paper money discrimination module, for according to the display feature pair
It is described to carry out false distinguishing to false distinguishing bank note.
The display feature of corresponding each characteristic area in infrared external reflection figure of the embodiment of the present invention by treating false distinguishing bank note
It is recognized, carries out false distinguishing to treat false distinguishing bank note, solve the problems, such as that false distinguishing result is undesirable in the prior art, improves mirror
The accuracy of pseudo- result.
Detailed description of the invention
Fig. 1 is a kind of paper money discrimination method flow diagram that the embodiment of the present invention one provides；
Fig. 2 is a kind of paper money discrimination method flow diagram provided by Embodiment 2 of the present invention；
Fig. 3 a is the natural light reflectogram of the part Iran coin in paper money discrimination method provided in an embodiment of the present invention；
Fig. 3 b is the infrared external reflection figure of the part Iran coin in paper money discrimination method provided in an embodiment of the present invention；
Fig. 4 is a kind of paper money discrimination schematic device that the embodiment of the present invention three provides.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of paper money discrimination method flow diagram that the embodiment of the present invention one provides.This method be suitable for bank note into
The case where row false distinguishing, this method can be executed by paper money discrimination device, the device can by the mode of software and/or hardware Lai
It realizes, is generally integrated in the equipment such as cash inspecting machine or cash recycling system.This method specifically includes:
The infrared external reflection figure of S110, acquisition to false distinguishing bank note；
It is irradiated to described to false distinguishing bank note by infrared light supply, and the biography by being located at the same side with the infrared light supply
Sensor obtains the image to false distinguishing bank note under Infrared irradiation, since the infrared light issued from infrared light supply is passed through to false distinguishing bank note
It is reflected into sensor, therefore, the image got is exactly the infrared external reflection figure.Wherein, the infrared external reflection figure is grayscale image.
S120, the default characteristic area according to the corresponding genuine note of false distinguishing bank note, determine in the infrared external reflection figure
Corresponding characteristic area；
The default characteristic area of genuine note is made of different materials, this different materials meeting in infrared external reflection figure
Different display features is shown, the true and false of this bank note being made of unlike material can be distinguished according to this display feature.
It, can be according to described corresponding true to false distinguishing bank note in determining the infrared external reflection figure when corresponding characteristic area
The feature of the default characteristic area of coin is identified by feature and is determined to have same characteristic features in the infrared external reflection figure of false distinguishing bank note
Characteristic area；Corresponding characteristic area in infrared external reflection figure can also be determined by sliding window.
Optionally, according to the default characteristic area to the corresponding genuine note of false distinguishing bank note, the infrared external reflection figure is determined
In corresponding characteristic area include: default characteristic area according to described to the corresponding genuine note of false distinguishing bank note, it is determining with it is described pre-
If the corresponding sliding window of characteristic area；The sliding window is slided in infrared external reflection figure, determines the characteristic area
Domain.Using the method location feature region of sliding window, accurate positioning.
Optionally, the default characteristic area can be the region including color shifting ink feature, using color shifting ink pair
The difference of light absorption ability and realize feature identification, can be bank's character area.Text in bank's character area by
The ink of unlike material is constituted, so that different display features can be presented in infrared external reflection light.
S130, the pixel value for obtaining pixel in the characteristic area；
The light to the reflection of false distinguishing bank note can be reflected on sensor, and light intensity is converted voltage value by sensor, then passes through
Analog-to-digital conversion is crossed, digital quantity is obtained, which is pixel value.The reflecting brightness value of pixel value reflection, due to unlike material
Pixel value difference will cause to the albedo difference of infrared light.
S140, the display feature that the characteristic area is determined according to the pixel value；
According to the pixel value of pixel each in characteristic area, determines the display feature of the characteristic area, that is, determine institute
State in characteristic area whether and meanwhile the Partial Feature comprising discoloration and non-discoloration Partial Feature.
S150, false distinguishing is carried out to false distinguishing bank note to described according to the display feature.
When the Partial Feature of Partial Feature and non-discoloration in the characteristic area simultaneously comprising discoloration, determine it is described to
False distinguishing bank note is genuine note；When the Partial Feature of Partial Feature or non-discoloration in the characteristic area only comprising discoloration, really
Fixed described to false distinguishing bank note is counterfeit money.
The display feature of corresponding each characteristic area in infrared external reflection figure of the embodiment of the present invention by treating false distinguishing bank note
It is recognized, carries out false distinguishing to treat false distinguishing bank note, solve the problems, such as that false distinguishing result is undesirable in the prior art, improves paper
The accuracy of coin false distinguishing result.
Embodiment two
Fig. 2 is a kind of flow chart of the paper money discrimination method provided in the embodiment of the present invention two, and the present embodiment is real upper one
It applies and is optimized on the basis of example, in the present embodiment, default characteristic area includes presetting non-color change interval and default transformation region
Domain, respectively to " according to the default characteristic area to the corresponding genuine note of false distinguishing bank note, determining in the infrared external reflection figure corresponding
Characteristic area ", " the display feature of the characteristic area is determined according to the pixel value ", " according to the display feature to institute
State and carry out false distinguishing to false distinguishing bank note " it is advanced optimized, specifically includes the following steps:
The infrared external reflection figure of S210, acquisition to false distinguishing bank note；
S220, non-color change interval is preset according to described, determines corresponding non-color change interval in the characteristic area；
S230, according to the default color change interval, determine corresponding color change interval in the characteristic area；
Illustratively, default characteristic area can be bank's character area of Iranian coin, and Fig. 3 a mentions for the embodiment of the present invention
The natural light reflectogram of part Iran coin in the paper money discrimination method of confession, as shown in Figure 3a, since bank's character area is not by
The ink of same material is printed, and different display features can be presented under infrared light, and therefore, which is default
Characteristic area, wherein bank's character area includes presetting non-color change interval 310 and default color change interval 320, presets non-discoloration
Bank's text in region 310 can normally be shown under the reflection of infrared light, and bank's text in default color change interval 320
It conceals, cannot show under the reflection of infrared light.Fig. 3 b is in paper money discrimination method provided in an embodiment of the present invention
The infrared external reflection figure of the Iranian coin in part, as shown in Figure 3b, 330 be non-color change interval, and 340 be color change interval, in non-color change interval
Include the case where half of letter in 330, this is because the letter is made of different materials.According to presetting non-color change interval
310, determine corresponding non-color change interval 330 in the characteristic area；According to default color change interval 320, the characteristic area is determined
Corresponding color change interval 340 in domain.It can more intuitively be identified using color change interval and non-color change interval this method is distinguished
The display feature of characteristic area.
S240, the pixel value for obtaining pixel in the characteristic area；
The mean value of pixel value described in S250, the statistics characteristic area；
S260, according to the relationship of the pixel value and the preset ratio threshold value of the mean value, determine the non-color change interval
The corresponding pixel of bank's text in the middle corresponding pixel of bank's text and the color change interval；
Since the corresponding pixel pixel value of bank's text is small compared with background area thresholding, then when the pixel value is divided by described equal
When being worth resulting value less than preset ratio threshold value, determine that the corresponding pixel of the pixel value is bank in the non-color change interval
The corresponding pixel of text；When the pixel value is greater than or equal to preset ratio threshold value divided by the resulting value of the mean value, really
Determining the corresponding pixel of the pixel value is the corresponding pixel of bank's text in the color change interval.It illustratively, can be by
Background and bank's text are distinguished according to a preset threshold value, such as preset ratio threshold value can be 60%, that is, be less than mean value
60% point is the corresponding pixel of bank's text.Background and bank's text can be efficiently differentiated in this way, be convenient for
Further analyze the display feature of characteristic area.
S270, to calculate the corresponding pixel of bank's text in the non-color change interval shared in the non-color change interval
Ratio as non-discoloration ratio, and calculates in the color change interval the corresponding pixel of bank's text in the color change interval
Shared ratio, as discoloration ratio；
Illustratively, for the image of a specified resolution, settable non-electrochrome pixel point threshold value is 300 pixels,
The ratio of this non-electrochrome pixel point threshold value and the non-total pixel number of color change interval is non-discoloration proportion threshold value, when non-discoloration
When ratio is greater than non-discoloration proportion threshold value, then determine that the non-color change interval meets genuine note feature.This method combines practical true
The feature of coin, it is with strong points.
Likewise, being directed to the image of a specified resolution, settable electrochrome pixel point threshold value is 100 pixels, this change
The ratio of colour vegetarian refreshments threshold value and the total pixel number of the color change interval is the proportion threshold value that changes colour, when discoloration ratio is less than discoloration
When proportion threshold value, then determine that the color change interval meets genuine note feature, wherein the setting of electrochrome pixel point threshold value is to distinguish
Noise and set.This method has detected the text points of color change interval, improves the accuracy of identification.
S280, feature is shown according to the non-discoloration ratio and the discoloration ratio-dependent；
S290, false distinguishing is carried out to false distinguishing bank note to described according to the display feature.
Specifically, non-discoloration proportion threshold value and the discoloration ratio are preset it is less than default change when the non-discoloration ratio is greater than
When color proportion threshold value, determine that described to false distinguishing bank note is genuine note.
The non-discoloration ratio of comprehensive non-color change interval and the discoloration ratio of color change interval, when meeting genuine note feature, just really
Fixed described to false distinguishing bank note is genuine note.
The technical solution of the present embodiment, to the characteristic area display feature is determined in preceding embodiment, this be with a portion of
It is described in detail, increases the preset ratio threshold value of the mean value for distinguishing bank's text and background, and increase non-discoloration ratio
Example and discoloration two parameters of ratio are further mentioned for solving the problems, such as how to show that feature is determined this to characteristic area
High paper money discrimination accuracy.
Embodiment three
Fig. 4 is a kind of schematic diagram of the paper money discrimination device provided in the embodiment of the present invention three, is specifically included:
Infrared external reflection figure obtains module 410, for obtaining the infrared external reflection figure to false distinguishing bank note；
Characteristic area determining module 420, for the default characteristic area according to the corresponding genuine note of false distinguishing bank note, really
Corresponding characteristic area in the fixed infrared external reflection figure；
Pixel value obtains module 430, for obtaining the pixel value of pixel in the characteristic area；
Characteristic determination module 440 is shown, for determining the display feature of the characteristic area according to the pixel value；
Paper money discrimination module 450, for carrying out false distinguishing to false distinguishing bank note to described according to the display feature.
Optionally, characteristic area determining module 420 includes:
Sliding window determination unit, for determining according to the default characteristic area to the corresponding genuine note of false distinguishing bank note
Sliding window corresponding with the default characteristic area；
Characteristic area determination unit determines the spy for sliding the sliding window in infrared external reflection figure
Levy region.
Specifically, the default characteristic area includes color shifting ink feature, and the default characteristic area is bank's literal field
Domain.
Preferably, presetting characteristic area includes presetting non-color change interval and default color change interval；
The characteristic area determining module 420 includes:
Non- color change interval determination unit determines corresponding in the characteristic area for presetting non-color change interval according to described
Non- color change interval；
Color change interval determination unit, for determining corresponding change in the characteristic area according to the default color change interval
Color region；
The display characteristic determination module 440 includes:
Mean value statistic unit, for counting the mean value of pixel value described in the characteristic area；
Text point determination unit is determined for the relationship according to the pixel value and the preset ratio threshold value of the mean value
The corresponding pixel of bank's text in the corresponding pixel of bank's text and the color change interval in the non-color change interval；
Ratio computing unit, for calculating in the non-color change interval the corresponding pixel of bank's text in the non-discoloration
Shared ratio in region as non-discoloration ratio, and calculates in the color change interval the corresponding pixel of bank's text in institute
Ratio shared in color change interval is stated, as discoloration ratio；
Characteristics determining unit is shown, for showing spy according to the non-discoloration ratio and the discoloration ratio-dependent
Sign.
Further, the paper money discrimination module 450 is specifically used for: presetting non-discoloration ratio when the non-discoloration ratio is greater than
When example threshold value and the discoloration ratio are less than default discoloration proportion threshold value, determine that described to false distinguishing bank note is genuine note.
Paper money discrimination provided by any embodiment of the invention can be performed in paper money discrimination device provided in an embodiment of the present invention
Method has the corresponding functional module of execution method and beneficial effect.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (6)
1. a kind of paper money discrimination method characterized by comprising
Obtain the infrared external reflection figure to false distinguishing bank note；
According to the default characteristic area to the corresponding genuine note of false distinguishing bank note, corresponding feature in the infrared external reflection figure is determined
Region；
Obtain the pixel value of pixel in the characteristic area；
The display feature of the characteristic area is determined according to the pixel value；
False distinguishing is carried out to false distinguishing bank note to described according to the display feature；
Wherein, the default characteristic area includes color shifting ink feature, and the default characteristic area is bank's character area；
The default characteristic area includes presetting non-color change interval and default color change interval；
According to the default characteristic area to the corresponding genuine note of false distinguishing bank note, corresponding feature in the infrared external reflection figure is determined
Region includes:
Non- color change interval is preset according to described, determines corresponding non-color change interval in the characteristic area；
According to the default color change interval, corresponding color change interval in the characteristic area is determined；
The display feature for determining the characteristic area according to the pixel value includes:
Count the mean value of pixel value described in the characteristic area；
According to the relationship of the pixel value and the preset ratio threshold value of the mean value, bank's text in the non-color change interval is determined
The corresponding pixel of bank's text in corresponding pixel and the color change interval；
The ratio that the corresponding pixel of bank's text is shared in the non-color change interval in the non-color change interval is calculated, as
Non- discoloration ratio, and calculate the ratio that the corresponding pixel of bank's text is shared in the color change interval in the color change interval
Example, as discoloration ratio；
Feature is shown according to the non-discoloration ratio and the discoloration ratio-dependent.
2. the method according to claim 1, wherein according to the default spy to the corresponding genuine note of false distinguishing bank note
Region is levied, determines that corresponding characteristic area includes: in the infrared external reflection figure
According to the default characteristic area to the corresponding genuine note of false distinguishing bank note, determining cunning corresponding with the default characteristic area
Dynamic window；
The sliding window is slided in infrared external reflection figure, determines the characteristic area.
3. the method according to claim 1, wherein being carried out to described to false distinguishing bank note according to the display feature
False distinguishing includes:
It presets non-discoloration proportion threshold value and the discoloration ratio when the non-discoloration ratio is greater than and is less than the default proportion threshold value that changes colour
When, determine that described to false distinguishing bank note is genuine note.
4. a kind of paper money discrimination device characterized by comprising
Infrared external reflection figure obtains module, for obtaining the infrared external reflection figure to false distinguishing bank note；
Characteristic area determining module, described in determining according to the default characteristic area to the corresponding genuine note of false distinguishing bank note
Corresponding characteristic area in infrared external reflection figure；
Pixel value obtains module, for obtaining the pixel value of pixel in the characteristic area；
Characteristic determination module is shown, for determining the display feature of the characteristic area according to the pixel value；
Paper money discrimination module, for carrying out false distinguishing to false distinguishing bank note to described according to the display feature；
Wherein, the default characteristic area includes color shifting ink feature, and the default characteristic area is bank's character area；
Default characteristic area includes presetting non-color change interval and default color change interval；
The characteristic area determining module includes:
Non- color change interval determination unit determines corresponding non-in the characteristic area for presetting non-color change interval according to described
Color change interval；
Color change interval determination unit, for determining corresponding transformation region in the characteristic area according to the default color change interval
Domain；
The display characteristic determination module includes:
Mean value statistic unit, for counting the mean value of pixel value described in the characteristic area；
Text point determination unit, for the relationship according to the pixel value and the preset ratio threshold value of the mean value, determine described in
The corresponding pixel of bank's text in the corresponding pixel of bank's text and the color change interval in non-color change interval；
Ratio computing unit, for calculating in the non-color change interval the corresponding pixel of bank's text in the non-color change interval
In shared ratio, as non-discoloration ratio, and calculate in the color change interval the corresponding pixel of bank's text in the change
Shared ratio in color region, as discoloration ratio；
Characteristics determining unit is shown, for showing feature according to the non-discoloration ratio and the discoloration ratio-dependent.
5. device according to claim 4, which is characterized in that characteristic area determining module includes:
Sliding window determination unit, for according to the default characteristic area to the corresponding genuine note of false distinguishing bank note, determining and institute
State the corresponding sliding window of default characteristic area；
Characteristic area determination unit determines the characteristic area for sliding the sliding window in infrared external reflection figure
Domain.
6. device according to claim 4, which is characterized in that the paper money discrimination module is specifically used for: when the non-change
Color ratio example is greater than when presetting non-discoloration proportion threshold value and the discoloration ratio and being less than default discoloration proportion threshold value, determine described in wait reflect
Pseudo- bank note is genuine note.
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| CN201610834871.2A CN106373255B (en) | 2016-09-20 | 2016-09-20 | A kind of paper money discrimination method and device |
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Families Citing this family (3)
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| CN107093259B (en) * | 2017-03-09 | 2019-07-26 | 深圳怡化电脑股份有限公司 | A kind of recognition methods of forge or true or paper money and its device |
| CN107067533A (en) * | 2017-04-14 | 2017-08-18 | 深圳怡化电脑股份有限公司 | The method and device that a kind of bank note differentiates |
| CN111599080B (en) * | 2019-02-20 | 2022-04-12 | 深圳怡化电脑股份有限公司 | Spliced paper money detection method and device, financial machine tool equipment and storage medium |
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| CN101290689A (en) * | 2007-04-19 | 2008-10-22 | 蔡永权 | Banknote quality checking and recognition method |
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