CN105243648B - A kind of method and system for eliminating magnetic spot noise on press-note axis - Google Patents
A kind of method and system for eliminating magnetic spot noise on press-note axis Download PDFInfo
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- CN105243648B CN105243648B CN201510727575.8A CN201510727575A CN105243648B CN 105243648 B CN105243648 B CN 105243648B CN 201510727575 A CN201510727575 A CN 201510727575A CN 105243648 B CN105243648 B CN 105243648B
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Abstract
The invention discloses a kind of method and system for eliminating magnetic spot noise on press-note axis.This method includes：Obtain the magnetic data image of bank note；Region segmentation is carried out to the magnetic data image, obtains non-magnetic region；Obtain the doubt magnetic block in the non-magnetic region；Determine that the doubt magnetic block is less than or equal to preset threshold value for the area of during cycle distribution and doubt magnetic block, the doubt magnetic block is filtered.A kind of method for eliminating magnetic spot noise on press-note axis provided by the invention, determine the doubt magnetic block for caused by magnetic point on press-note axis by judging period profile and the area features of doubt magnetic block, the doubt magnetic block is filtered, so as to eliminate influence of the magnetic spot noise to magnetic algorithm accuracy of identification on press-note axis, the accuracy rate of money-checking is improved.
Description
Technical field
The present invention relates to data processing field, more particularly to a kind of eliminate the method for magnetic spot noise on money-checking axis and be
System.
Background technology
Under the data environment gathered using magnetic data sensor, according to tested banknote magnetic sensor magnetic point with
When the difference of genuine notes magnetic data is to differentiate authenticity of banknotes, due to the influence of various external environments, magnetic data can be noisy
In the presence of.Since the gap of sensor and press-note axis is generally 0.15~0.3mm, in the bank note data of magnetic sensor collection,
Because of the long-term influence for running paper money or high/low temperature, press-note axis inevitably can be infected with upper magnetism by weakly magnetization etc., therefore magnetic
The periodic noise of press-note axis introducing can be there are in data, this noise does not only exist low-frequency range, can also exist in high band.
It is not added with, to handle, to seriously affect the precision of magnetic algorithm identification to this noise like.
In the magnetic algorithm that presently, there are, have and removed using Fourier transformation in the low frequency background in magnetic collection data
Noise, but the part of periodic noise that press-note axis introduces is mingled in high frequency section, low frequency filtering denoising effect unobvious, and
And because sensor resolution lifted the reason for, do not allow to do Fourier transformation to whole magnetic data in timeliness, therefore now yet
Algorithm in can not effectively remove press-note axis introducing periodic noise.
The content of the invention
The present invention provides a kind of method and system for eliminating magnetic spot noise on press-note axis, by judging doubt magnetic block
Period profile and area determine the doubt magnetic block caused by magnetic point on press-note axis, to be filtered to the doubt magnetic block
Ripple, so as to eliminate influence of the magnetic spot noise to magnetic algorithm accuracy of identification on press-note axis, improves the accuracy rate of money-checking.
To realize above-mentioned design, the present invention uses following technical scheme：
On the one hand, there is provided a kind of method for eliminating magnetic spot noise on press-note axis, this method, including：
Obtain the magnetic data image of bank note；
Region segmentation is carried out to the magnetic data image, obtains non-magnetic region；
Obtain the doubt magnetic block in the non-magnetic region；
Determine that the doubt magnetic block is less than or equal to preset threshold value for the area of during cycle distribution and doubt magnetic block,
The doubt magnetic block is filtered.
Preferably：
It is described that region segmentation is carried out to the magnetic data image, non-magnetic region is obtained, including：According to the magnetic number
According to the magnetic data in image, region segmentation is carried out to the magnetic data image, is partitioned into crown word number magnetic regions, anti-counterfeiting line
Magnetic regions and pattern magnetic regions, the side of anti-counterfeiting line magnetic regions and positioned at crown word number magnetic regions top and under
Side, be partitioned into two non-magnetic regions, anti-counterfeiting line magnetic regions opposite side and positioned at pattern magnetic regions top and under
Side, is partitioned into two non-magnetic regions.
Preferably：
The magnetic data of the magnetic data image of the bank note is divided into 18 row, 1386 rows, and each column is as a passage；
It is described to determine that the doubt magnetic block is distributed for during cycle, including：Passage is at this where determining doubt magnetic block
The position of the preset quantity row of doubt magnetic block above or below, there are the same or similar another doubt magnetic block, then draws
Doubt magnetic block is distributed for during cycle, 560~600 row of preset quantity behavior；
The area of the doubt magnetic block is less than or equal to preset threshold value, including, determine that the area of the doubt magnetic block is small
In equal to 40 ranks；
The area of the doubt magnetic block is：
Using behavior ordinate, row coordinate system is established as ordinate for abscissa, amplitude；When ordinate is 2350 and 1850
When, parallel XOY plane makees the section of magnetic data respectively；Take in two sections, the corresponding columns of maximum abscissa, minimum horizontal seat
Mark the corresponding line number of corresponding columns, maximum ordinate line number corresponding with minimum ordinate；The area of doubt magnetic block=(most
The big corresponding line number of ordinate-corresponding line number+1 of minimum ordinate) × (corresponding columns-minimum abscissa of maximum abscissa
Corresponding columns+1) ranks；
It is described that the doubt magnetic block is filtered, including, using Fourier transformation logical where doubt magnetic block
The magnetic data in road is converted into magnet passage schematic diagram, and the magnet passage schematic diagram is filtered.
Preferably, it is described that region segmentation, after obtaining non-magnetic region, the acquisition are carried out to the magnetic data image
Before doubt magnetic block in the non-magnetic region, further include：Determine the crown word number magnetic regions, anti-counterfeiting line magnetic regions
Meet the magnetic characteristic of genuine notes with pattern magnetic regions.
Preferably：
The doubt magnetic block in the non-magnetic region is obtained, including：Magnetic statistics is carried out to the non-magnetic region, is obtained
Obtain the doubt magnetic block that one or more of non-magnetic region region occurs；
The doubt magnetic block, specifically, occur the magnetic block of magnetic point in non-magnetic region, the magnetic point is,
When background amplitude is 2000, amplitude is more than 2150 and/or the magnetic point less than 1850.
Preferably, the magnetic data in the magnetic data image, area is carried out to the magnetic data image
Regional partition, is partitioned into crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions, specifically includes：
The number of 18 passage magnetic points is counted, the largest number of passages of magnetic point are anti-counterfeiting line magnetic regions；
According to anti-counterfeiting line magnetic regions and bank note towards correspondence, determine that crown word number magnetic regions, pattern are magnetic
Region.
On the other hand, there is provided a kind of system for eliminating magnetic spot noise on press-note axis, the system, including：
Acquisition module, obtains the magnetic data image of bank note；
Split module, region segmentation is carried out to the magnetic data, obtains non-magnetic region；
Module is obtained, obtains the doubt magnetic block of the non-magnetic region；
Filter module, determines that the doubt magnetic block is less than or equal to for the area of during cycle distribution and doubt magnetic block
Preset threshold value, is filtered the doubt magnetic block.
Preferably, the segmentation module, is specifically used for, according to the magnetic data in the magnetic data image, to described
Magnetic data image carries out region segmentation, is partitioned into crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions,
The side of anti-counterfeiting line magnetic regions and above and below the crown word number magnetic regions, is partitioned into two non-magnetic regions,
The opposite side of anti-counterfeiting line magnetic regions and above and below the pattern magnetic regions, is partitioned into two non-magnetic regions.
Preferably：
The magnetic data of the magnetic data image of the bank note is divided into 18 row, 1386 rows, and each column is as a passage；
The filter module includes：
Cycle determination unit, preset quantity of the passage in the doubt magnetic block above or below where determining doubt magnetic block
Capable position, there are the same or similar another doubt magnetic block, then show that doubt magnetic block is distributed for during cycle, described pre-
Put 560~600 row of quantity behavior；
Area determination unit, determines that the area of the doubt magnetic block is less than or equal to 40 ranks；
The area of the doubt magnetic block is：
The area of doubt magnetic block=(maximum ordinate-minimum ordinate+1) × (maximum abscissa-minimum abscissa+
1) ranks, ordinate correspond to the line number of the magnetic data, and abscissa corresponds to the columns of the magnetic data；
The magnetic data of passage where doubt magnetic block, is converted into magnet passage using Fourier transformation and shown by filter unit
It is intended to, the magnet passage schematic diagram is filtered.
Preferably, the acquisition module, is additionally operable to, and determines the crown word number magnetic regions, anti-counterfeiting line magnetic regions and figure
Case magnetic regions meet the magnetic characteristic of genuine notes.
Compared with prior art, beneficial effects of the present invention are：Obtain the magnetic data image of bank note；To the magnetic number
Region segmentation is carried out according to image, obtains non-magnetic region；Obtain the doubt magnetic block in the non-magnetic region；Determine described doubt
Puzzled magnetic block is distributed for during cycle and the area of doubt magnetic block is less than or equal to preset threshold value, to the doubt magnetic block into
Row filtering.A kind of method for eliminating magnetic spot noise on press-note axis provided by the invention, by the cycle for judging doubt magnetic block
It is distributed with area to determine the doubt magnetic block caused by magnetic point on press-note axis, to be filtered to the doubt magnetic block, from
And influence of the magnetic spot noise to magnetic algorithm accuracy of identification on press-note axis is eliminated, the accuracy rate of money-checking is improved, and ensure that calculation
The efficiency of method.
Brief description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also implement according to the present invention
The content of example and these attached drawings obtain other attached drawings.
Fig. 1 is first of the method for magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The method flow diagram of embodiment.
Fig. 2 is second of the method for magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The method flow diagram of embodiment.
Fig. 3 is the 3 of the method for magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The method flow diagram of embodiment.
Fig. 4 is first of the system of magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The block diagram of embodiment.
Fig. 5 is second of the system of magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The block diagram of embodiment.
Fig. 6 a are 100 yuans of the positive schematic diagrames in front；Fig. 6 b are the positive magnetic numbers in 100 yuans of front
According to the corresponding schematic diagram of image；Fig. 6 c are 100 yuans of fronts reversely to schematic diagram；Fig. 6 d be 100 yuans just
The reverse corresponding schematic diagram of magnetic data image in face；Fig. 6 e are 100 yuans of reverse side forward direction schematic diagrames；Fig. 6 f are 100
Yuan reverse side forward direction the corresponding schematic diagram of magnetic data image；Fig. 6 g are that 100 yuans of reverse side is reversely illustrated
Figure；Fig. 6 h are the reverse corresponding schematic diagrames of magnetic data image of 100 yuans of reverse side.
Fig. 7 a are the magnet passage exemplary waveforms figures for not introducing noise spot；Fig. 7 b are that the magnet passage for introducing two noise spots shows
Meaning oscillogram；Fig. 7 c are the magnet passage exemplary waveforms figures for introducing three noise spots.
Embodiment
For make present invention solves the technical problem that, the technical solution that uses and the technique effect that reaches it is clearer, below
The technical solution of the embodiment of the present invention will be described in further detail with reference to attached drawing, it is clear that described embodiment is only
It is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art exist
All other embodiments obtained under the premise of creative work are not made, belong to the scope of protection of the invention.
Please refer to Fig.1, it is magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The method flow diagram of the first embodiment of method.As shown in the figure, this method, including：
Step S101：Obtain the magnetic data image of bank note.
The magnetic data of the magnetic data image of the bank note is stored in a three-dimensional matrice of X*Y*Z, forms one
Three-dimensional magnetic data image, wherein X represent columns, and Y represents line number, and Z represents that magnetic signal is converted to telecommunications by amplifier
Number amplitude, be a kind of method for the situation of change for carrying out reaction simulation amount using digital quantity.Preferably, in the embodiment of the present invention,
The magnetic data of the magnetic data image of the bank note is divided into 18 row, 1386 rows, and each column is as a passage, specifically, the model of X
Enclose for 0~17, totally 18 passages；The scope of Y is 0~1385, totally 1386 row, and according to the difference of hardware design, the scope of Y is not yet
Together；Under the magnetic head that the embodiment of the present invention uses the amplitude size fluctuation range of electric signal be 0~4000, i.e., the scope of Z be 0~
4000.The magnetic data of whole bank note is 1386 × 18 ranks, and the space shared by magnetic data region is about 900 × 16 rows
Row.
Step S102：Region segmentation is carried out to the magnetic data image, obtains non-magnetic region.
Preferably, it is described that region segmentation is carried out to the magnetic data image, non-magnetic region is obtained, including：According to institute
The magnetic data in magnetic data image is stated, region segmentation is carried out to the magnetic data image, is partitioned into crown word number magnetic area
Domain, anti-counterfeiting line magnetic regions and pattern magnetic regions, in the side of anti-counterfeiting line magnetic regions and positioned at crown word number magnetic regions
Above and below, be partitioned into two non-magnetic regions, anti-counterfeiting line magnetic regions opposite side and positioned at pattern magnetic regions
Above and below, it is partitioned into two non-magnetic regions.
Preferably, the magnetic data in the magnetic data image, carries out the magnetic data image, point
Crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions are cut out, are specifically included：
The number of 18 passage magnetic points is counted, the largest number of passages of magnetic point are anti-counterfeiting line magnetic regions；
According to anti-counterfeiting line magnetic regions and bank note towards correspondence, determine that crown word number magnetic regions and pattern are magnetic
Region.
Fig. 6 a to Fig. 6 h are 100 yuans towards schematic diagram and the corresponding schematic diagram of corresponding magnetic data image.
Exemplified by positive by 100 yuans of front, as shown in figures 6 a and 6b, Fig. 6 a are 100 yuans of the positive signals in front
Figure, Fig. 6 b are the positive corresponding schematic diagrames of magnetic data image in 100 yuans of front, if bank note is positive for front, really
After determining anti-counterfeiting line magnetic regions, according to RMB towards correspondence, then pattern magnetic regions are in anti-counterfeiting line magnetic regions
Left side central portion, crown word number magnetic regions are above the right side of anti-counterfeiting line magnetic regions, in the side of anti-counterfeiting line magnetic regions and position
Above and below crown word number magnetic regions, be partitioned into two non-magnetic regions, anti-counterfeiting line magnetic regions opposite side and
Above and below pattern magnetic regions, two non-magnetic regions are partitioned into.
Step S103：Obtain the doubt magnetic block in the non-magnetic region.
Preferably, the doubt magnetic block obtained in the non-magnetic region, including：The non-magnetic region is carried out
Magnetism statistics, obtains the doubt magnetic block that one or more of non-magnetic region region occurs；
The doubt magnetic block, specifically, occur the magnetic block of magnetic point in non-magnetic region, the magnetic point is,
When background amplitude is 2000, amplitude is more than 2150 and/or the magnetic point less than 1850.
Preferably, can be different according to different amplifiers, background amplitude, the background amplitude of the embodiment of the present invention is 2000,
The magnetic data being present between 2000~4000 is known as peak, and the magnetic data for being present in less than 2000 is known as paddy, in order to exclude
External environment, bank note is new and old and currency examination device is in itself etc. there may be the factor of noise, define threshold amplitude 1850~2150 it
Between magnetic data be noise, and amplitude be more than 2150 and/or the magnetic data less than 1850 be magnetic point magnetic data.
Step S104：Determine that the doubt magnetic block is less than or equal to for the area of during cycle distribution and doubt magnetic block
Preset threshold value, is filtered the doubt magnetic block.
It is described to determine that the doubt magnetic block is distributed for during cycle, including：Passage is at this where determining doubt magnetic block
The position of the preset quantity row of doubt magnetic block above or below, there are the same or similar another doubt magnetic block, then draws
Doubt magnetic block is distributed for during cycle, 560~600 row of preset quantity behavior；
The area of the doubt magnetic block is less than or equal to preset threshold value, including, determine that the area of the doubt magnetic block is small
In equal to 40 ranks；
The preset threshold value can also have been adjusted according to the difference of instrument, take other numerical value.
The area of the doubt magnetic block is：
Using behavior ordinate, row coordinate system is established as ordinate for abscissa, amplitude；When ordinate is 2350 and 1850
When, parallel XOY plane makees the section of magnetic data respectively；Take in two sections, the corresponding columns of maximum abscissa, minimum horizontal seat
Mark the corresponding line number of corresponding columns, maximum ordinate line number corresponding with minimum ordinate；The area of doubt magnetic block=(most
The big corresponding line number of ordinate-corresponding line number+1 of minimum ordinate) × (corresponding columns-minimum abscissa of maximum abscissa
Corresponding columns+1) ranks；
It is described that the doubt magnetic block is filtered, including, using Fourier transformation logical where doubt magnetic block
The magnetic data in road is converted into magnet passage schematic diagram, and the magnet passage schematic diagram is filtered.
In conclusion a kind of method for eliminating magnetic spot noise on press-note axis provided in an embodiment of the present invention, passes through judgement
The period profile of doubt magnetic block and area determine the doubt magnetic block as caused by magnetic point on press-note axis, to the doubt magnetic
Property block be filtered, so as to eliminate on press-note axis influence of the magnetic spot noise to magnetic algorithm accuracy of identification, improve the standard of money-checking
True rate.
Please refer to Fig.2, it is magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The method flow diagram of the second embodiment of method.As shown in the figure, this method, including：
Step S201：Obtain the magnetic data image of bank note.
The magnetic data of the magnetic data image of the bank note is stored in a three-dimensional matrice of X*Y*Z, forms one
Three-dimensional magnetic data image, wherein X represent columns, and Y represents line number, and Z represents that magnetic signal is converted to telecommunications by amplifier
Number amplitude, be a kind of method for the situation of change for carrying out reaction simulation amount using digital quantity.Preferably, in the embodiment of the present invention,
The magnetic data of the magnetic data image of the bank note is divided into 18 row, 1386 rows, and each column is as a passage, specifically, the model of X
Enclose for 0~17, totally 18 passages；The scope of Y is 0~1385, totally 1386 row, and according to the difference of hardware design, the scope of Y is not yet
Together；Under the magnetic head that the embodiment of the present invention uses the amplitude size fluctuation range of electric signal be 0~4000, i.e., the scope of Z be 0~
4000。
Step S202：Region segmentation is carried out to the magnetic data image, obtains non-magnetic region.
Preferably, it is described that region segmentation is carried out to the magnetic data image, non-magnetic region is obtained, including：According to institute
The magnetic data in magnetic data image is stated, region segmentation is carried out to the magnetic data image, is partitioned into crown word number magnetic area
Domain, anti-counterfeiting line magnetic regions and pattern magnetic regions, in the side of anti-counterfeiting line magnetic regions and positioned at crown word number magnetic regions
Above and below, be partitioned into two non-magnetic regions, anti-counterfeiting line magnetic regions opposite side and positioned at pattern magnetic regions
Above and below, it is partitioned into two non-magnetic regions.
Preferably, the magnetic data in the magnetic data image, area is carried out to the magnetic data image
Regional partition, is partitioned into crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions, specifically includes：
The number of 18 passage magnetic points is counted, the largest number of passages of magnetic point are anti-counterfeiting line magnetic regions；
According to anti-counterfeiting line magnetic regions and bank note towards correspondence, determine that crown word number magnetic regions and pattern are magnetic
Region.
Step S203：Obtain the doubt magnetic block in the non-magnetic region.
Preferably, the doubt magnetic block obtained in the non-magnetic region, including：The non-magnetic region is carried out
Magnetism statistics, obtains the doubt magnetic block that one or more of non-magnetic region region occurs；
The doubt magnetic block, specifically, occur the magnetic block of magnetic point in non-magnetic region, the magnetic point is,
When background amplitude is 2000, amplitude is more than 2150 and/or the magnetic point less than 1850.
Preferably, can be different according to different amplifiers, background amplitude, the background amplitude of the embodiment of the present invention is 2000,
The magnetic data being present between 2000~4000 is known as peak, and the magnetic data for being present in less than 2000 is known as paddy, in order to exclude
External environment, bank note is new and old and currency examination device is in itself etc. there may be the factor of noise, define threshold amplitude 1850~2150 it
Between magnetic data be noise, and amplitude be more than 2150 and/or the magnetic data less than 1850 be magnetic point magnetic data.
Step S204：Determine the preset quantity row of passage where doubt magnetic block in the doubt magnetic block above or below
Position, there are the same or similar another doubt magnetic block, then show that doubt magnetic block is distributed for during cycle.
Preferably, 560~600 row of preset quantity behavior.
The rotating speed of press-note axis is 1350 revs/min, drives banknote linear velocity 1102.7mm/ seconds, therefore press-note axis turns around,
The displacement of banknote is 1102.7*60/1350=49mm, according to the position sensor characteristic of currency checking module, the displacement of bank note：
0.846mm corresponds to ten row magnetic datas of collection, therefore press-note axis turns around, and probably gathers 49/0.846=58, i.e. 580 row magnetic numbers
According to.And whole magnetic data is 1386 rows, therefore, it is possible to introduce two noise spots in whole magnetic data, is also possible to
Three noise spots are introduced, Fig. 7 a, Fig. 7 b, Fig. 7 c are respectively magnet passage exemplary waveforms of the crown word number region magnetism under single channel
Figure, Fig. 7 a are the magnet passage exemplary waveforms figures for not introducing noise spot, and Fig. 7 b are the magnet passage signal ripples for introducing two noise spots
Shape figure, Fig. 7 c are the magnet passage exemplary waveforms figures for introducing three noise spots, it is observed that the magnetic interval in two noise spots
For 570~580 rows, according to this feature, the noise of magnetic point on this kind of press-note axis can be carried out by conditional filtering
Processing.Preferably, 580 row of preset quantity behavior of the embodiment of the present invention, other preset numbers are also can use according to different currency examination devices
Amount row, such as 560 rows, 570 rows, 590 rows, 600 rows.
Step S205：Determine that the area of the doubt magnetic block is less than or equal to 40 ranks.
Preferably, the area of the doubt magnetic block is：
Using behavior ordinate, row coordinate system is established as ordinate for abscissa, amplitude；When ordinate is 2350 and 1850
When, parallel XOY plane makees the section of magnetic data respectively；Take in two sections, the corresponding columns of maximum abscissa, minimum horizontal seat
Mark the corresponding line number of corresponding columns, maximum ordinate line number corresponding with minimum ordinate；The area of doubt magnetic block=(most
The big corresponding line number of ordinate-corresponding line number+1 of minimum ordinate) × (corresponding columns-minimum abscissa of maximum abscissa
Corresponding columns+1) ranks.
If the area of doubt magnetic block meets period profile and the feature of area, the doubt magnetic block is on press-note axis
What magnetic point introduced.When detecting counterfeit money, because the reason for material technique, even true and false splicing paper money more true to nature, non-
The feature and the feature of the magnetic point on press-note axis that doubt magnetic block in magnetic regions is presented have larger difference, and counterfeit money is non-magnetic
Property region in doubt magnetic block area it is larger, nor exist periodically.
Step S206：The magnetic data of the passage where doubt magnetic block magnet passage is converted into using Fourier transformation to show
It is intended to, the magnet passage exemplary waveforms figure is filtered.
Magnetic number using Fourier transformation the passage where the doubt magnetic block for meeting period profile and area features
According to magnet passage schematic diagram is converted into, in case there is a need, can also at any time using inverse Fourier transform to magnetic data into
Row reduction.Only the magnet passage exemplary waveforms figure is filtered, removes noise caused by magnetic point on press-note axis, it is not necessary to right
Whole magnetic data does Fourier transformation, also improves the treatment effeciency of magnetic data.By this processing mode, intactly protect
Original magnetic data has been stayed, has eliminated influence of the noise to magnetic algorithm, and the efficiency of the magnetic algorithm ensured.For vacation
Paper money, also retains the magnetic regions for not meeting feature.
Make an uproar in conclusion the embodiment of the present invention can remove the high frequency being mingled in magnetic data being introduced into by press-note axis
Sound, remove influence of noise while also intactly remain original magnetic data, only to the magnet passage exemplary waveforms figure into
Row filtering, also improves the efficiency of magnetic algorithm.
Please refer to Fig.3, it is magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The method flow diagram of the 3rd embodiment of method.As shown in the figure, this method, including：
Step S301：Obtain the magnetic data image of bank note.
Preferably, in the embodiment of the present invention, the magnetic data of the magnetic data image of the bank note is divided into 18 row, 1386
OK, each column is as a passage.
Step S302：Region segmentation is carried out to the magnetic data image, obtains non-magnetic region.
Preferably, it is described that region segmentation is carried out to the magnetic data image, non-magnetic region is obtained, including：According to institute
The magnetic data in magnetic data image is stated, region segmentation is carried out to the magnetic data image, is partitioned into crown word number magnetic area
Domain, anti-counterfeiting line magnetic regions and pattern magnetic regions, in the side of anti-counterfeiting line magnetic regions and positioned at crown word number magnetic regions
Above and below, be partitioned into two non-magnetic regions, anti-counterfeiting line magnetic regions opposite side and positioned at pattern magnetic regions
Above and below, it is partitioned into two non-magnetic regions.
Preferably, the magnetic data in the magnetic data image, carries out the magnetic data image, point
Crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions are cut out, are specifically included：
The number of 18 passage magnetic points is counted, the largest number of passages of magnetic point are anti-counterfeiting line magnetic regions；
According to anti-counterfeiting line magnetic regions and bank note towards correspondence, determine that crown word number magnetic regions and pattern are magnetic
Region.
Step S303：Determine that the crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions meet genuine notes
Magnetic characteristic.
Magnetic algorithm be exactly feature for crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions these three
Magnetic regions are matched, if the magnetic characteristic for having a region not meet genuine notes in these three magnetic regions, illustrate detection
Bank note is counterfeit money, then stops detection；If these three magnetic regions all meet the magnetic characteristic of genuine notes, illustrating the bank note of detection, have can
It can be genuine notes, then perform next step.
Step S304：Obtain the doubt magnetic block in the non-magnetic region.
Preferably, the doubt magnetic block obtained in the non-magnetic region, including：The non-magnetic region is carried out
Magnetism statistics, obtains the doubt magnetic block that one or more of non-magnetic region region occurs；
The doubt magnetic block, specifically, occur the magnetic block of magnetic point in non-magnetic region, the magnetic point is,
When background amplitude is 2000, amplitude is more than 2150 and/or the magnetic point less than 1850.
Preferably, can be different according to different amplifiers, background amplitude, the background amplitude of the embodiment of the present invention is 2000,
The magnetic data being present between 2000~4000 is known as peak, and the magnetic data for being present in less than 2000 is known as paddy, in order to exclude
External environment, bank note is new and old and currency examination device is in itself etc. there may be the factor of noise, define threshold amplitude 1850~2150 it
Between magnetic data be noise, and amplitude be more than 2150 and/or the magnetic data less than 1850 be magnetic point magnetic data.
Step S305：Determine the preset quantity row of passage where doubt magnetic block in the doubt magnetic block above or below
Position, there are the same or similar another doubt magnetic block, then show that doubt magnetic block is distributed for during cycle.
Preferably, 580 row of preset quantity behavior of the embodiment of the present invention, it is preset also to can use other according to different currency examination devices
Quantity row, such as 560 rows, 570 rows, 590 rows, 600 rows.
Step S306：Determine that the area of the doubt magnetic block is less than or equal to 40 ranks.
Preferably, the area of the doubt magnetic block is：
Using behavior ordinate, row coordinate system is established as ordinate for abscissa, amplitude；When ordinate is 2350 and 1850
When, parallel XOY plane makees the section of magnetic data respectively；Take in two sections, the corresponding columns of maximum abscissa, minimum horizontal seat
Mark the corresponding line number of corresponding columns, maximum ordinate line number corresponding with minimum ordinate；The area of doubt magnetic block=(most
The big corresponding line number of ordinate-corresponding line number+1 of minimum ordinate) × (corresponding columns-minimum abscissa of maximum abscissa
Corresponding columns+1) ranks.
If the area of doubt magnetic block meets period profile and the feature of area, the doubt magnetic block is on press-note axis
What magnetic point introduced.When detecting counterfeit money, because the reason for material technique, even true and false splicing paper money more true to nature, non-
The feature and the feature of the magnetic point on press-note axis that doubt magnetic block in magnetic regions is presented have larger difference, and counterfeit money is non-magnetic
Property region in doubt magnetic block area it is larger, nor exist periodically.
Step S307：The magnetic data of the passage where doubt magnetic block magnet passage is converted into using Fourier transformation to show
It is intended to, the magnet passage schematic diagram is filtered.
Magnetic number using Fourier transformation the passage where the doubt magnetic block for meeting period profile and area features
According to magnet passage schematic diagram is converted into, in case there is a need, can also at any time using inverse Fourier transform to magnetic data into
Row reduction.Only the magnet passage exemplary waveforms figure is filtered, removes noise caused by magnetic point on press-note axis, it is not necessary to right
Whole magnetic data does Fourier transformation, also improves the treatment effeciency of magnetic data.For counterfeit money, it also retains and not meet spy
The magnetic regions of sign.
In conclusion the embodiment of the present invention is in definite the crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic
Property region meet the magnetic characteristic of genuine notes and then further detected, the efficiency of the magnetic algorithm of raising identification.
It is the reality of the system of magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention below
Example is applied, embodiment of the embodiment based on above-mentioned method of system realizes that not most description, refer to preceding method in systems
Embodiment.
Please refer to Fig.4, it is magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The block diagram of system first embodiment.As shown in the figure, the system, including：
Acquisition module 41, obtains the magnetic data image of bank note.
The magnetic data of the magnetic data image of the bank note is stored in a three-dimensional matrice of X*Y*Z, forms one
Three-dimensional magnetic data image, wherein X represent columns, and Y represents line number, and Z represents that magnetic signal is converted to telecommunications by amplifier
Number amplitude, be a kind of method for the situation of change for carrying out reaction simulation amount using digital quantity.Preferably, in the embodiment of the present invention,
The magnetic data of the magnetic data image of the bank note is divided into 18 row, 1386 rows, and each column is as a passage, specifically, the model of X
Enclose for 0~17, totally 18 passages；The scope of Y is 0~1385, totally 1386 row, and according to the difference of hardware design, the scope of Y is not yet
Together；The amplitude size fluctuation range of electric signal is 0~4000 under the magnetic head that the embodiment of the present invention uses, i.e. the scope of Z is 0-
4000。
Split module 42, region segmentation is carried out to the magnetic data, obtains non-magnetic region.
Preferably, the segmentation module 42, is specifically used for, according to the magnetic data in the magnetic data image, to institute
State magnetic data image and be partitioned into crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions, it is magnetic in anti-counterfeiting line
The side in region and above and below the crown word number magnetic regions, is partitioned into two non-magnetic regions, magnetic in anti-counterfeiting line
The opposite side in region and above and below the pattern magnetic regions, is partitioned into two non-magnetic regions.
Preferably, the magnetic data in the magnetic data image, carries out the magnetic data image, point
Crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions are cut out, are specifically included：
The number of 18 passage magnetic points is counted, the largest number of passages of magnetic point are anti-counterfeiting line magnetic regions；
According to anti-counterfeiting line magnetic regions and bank note towards correspondence, determine that crown word number magnetic regions and pattern are magnetic
Region.
Module 43 is obtained, obtains the doubt magnetic block of the non-magnetic region.
Preferably, the doubt magnetic block obtained in the non-magnetic region, including：The non-magnetic region is carried out
Magnetism statistics, obtains the doubt magnetic block that one or more of non-magnetic region region occurs；
The doubt magnetic block, specifically, occur the magnetic block of magnetic point in non-magnetic region, the magnetic point is,
When background amplitude is 2000, amplitude is more than 2150 and/or the magnetic point less than 1850.
Preferably, can be different according to different amplifiers, background amplitude, the background amplitude of the embodiment of the present invention is 2000,
The magnetic data being present between 2000~4000 is known as peak, and the magnetic data for being present in less than 2000 is known as paddy, in order to exclude
External environment, bank note is new and old and currency examination device is in itself etc. there may be the factor of noise, define threshold amplitude 1850~2150 it
Between magnetic data be noise, and amplitude be more than 2150 and/or the magnetic data less than 1850 be magnetic point magnetic data.
Filter module 44, determines that the doubt magnetic block is less than for the area of during cycle distribution and doubt magnetic block
In preset threshold value, the doubt magnetic block is filtered.
It is described to determine that the doubt magnetic block is distributed for during cycle, including：Passage is at this where determining doubt magnetic block
The position of the preset quantity row of doubt magnetic block above or below, there are the same or similar another doubt magnetic block, then draws
Doubt magnetic block is distributed for during cycle, the preset quantity behavior 560-600 rows；
The area of the doubt magnetic block is less than or equal to preset threshold value, including, determine that the area of the doubt magnetic block is small
In equal to 40 ranks；
The preset threshold value can also have been adjusted according to the difference of instrument, take other numerical value.
The area of the doubt magnetic block is：
Using behavior ordinate, row coordinate system is established as ordinate for abscissa, amplitude；When ordinate is 2350 and 1850
When, parallel XOY plane makees the section of magnetic data respectively；Take in two sections, the corresponding columns of maximum abscissa, minimum horizontal seat
Mark the corresponding line number of corresponding columns, maximum ordinate line number corresponding with minimum ordinate；The area of doubt magnetic block=(most
The big corresponding line number of ordinate-corresponding line number+1 of minimum ordinate) × (corresponding columns-minimum abscissa of maximum abscissa
Corresponding columns+1) ranks；
It is described that the doubt magnetic block is filtered, including, using Fourier transformation logical where doubt magnetic block
The magnetic data in road is converted into magnet passage schematic diagram, and the magnet passage schematic diagram is filtered.
In conclusion a kind of system for eliminating magnetic spot noise on press-note axis provided in an embodiment of the present invention, passes through judgement
The period profile of doubt magnetic block and area determine the doubt magnetic block as caused by magnetic point on press-note axis, to the doubt magnetic
Property block be filtered, so as to eliminate on press-note axis influence of the magnetic spot noise to magnetic algorithm accuracy of identification, improve the standard of money-checking
True rate.
Fig. 5 is refer to, it is magnetic spot noise on a kind of elimination press-note axis provided in the specific embodiment of the invention
The second embodiment of system.As shown in the figure, the system, including：
Acquisition module 51, obtains the magnetic data image of bank note；
Split module 52, region segmentation is carried out to the magnetic data, obtains non-magnetic region；
Module 53 is obtained, obtains the doubt magnetic block of the non-magnetic region；
The acquisition module 53, is additionally operable to, and determines that the crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern are magnetic
Region meets the magnetic characteristic of genuine notes.
Filter module 54, determines that the doubt magnetic block is less than for the area of during cycle distribution and doubt magnetic block
In preset threshold value, the doubt magnetic block is filtered.
Preferably, the filter module 54 includes：
Cycle determination unit 541, passage is in the preset of the doubt magnetic block above or below where determining doubt magnetic block
The position of quantity row, there are the same or similar another doubt magnetic block, then show that doubt magnetic block is distributed for during cycle, institute
State 560~600 row of preset quantity behavior.
Area determination unit 542, determines that the area of the doubt magnetic block is less than or equal to 40 ranks.
The area of the doubt magnetic block is：
The area of doubt magnetic block=(maximum ordinate-minimum ordinate+1) × (maximum abscissa-minimum abscissa+
1) ranks, ordinate correspond to the line number of the magnetic data, and abscissa corresponds to the columns of the magnetic data；
The magnetic data of passage where doubt magnetic block, magnetic flux is converted into using Fourier transformation by filter unit 543
Road schematic diagram, is filtered the magnet passage schematic diagram.
By this processing mode, original magnetic data is intactly remained, eliminates shadow of the noise to magnetic algorithm
Ring, and the efficiency of the magnetic algorithm ensured.For counterfeit money, the magnetic regions for not meeting feature are also retains.
Make an uproar in conclusion the embodiment of the present invention can remove the high frequency being mingled in magnetic data being introduced into by press-note axis
Sound, original magnetic data is also intactly remained while removing influence of noise, only to the magnet passage exemplary waveforms figure
It is filtered, ensure that the efficiency of magnetic algorithm, the embodiment of the present invention is magnetic in the definite crown word number magnetic regions, anti-counterfeiting line
Region and pattern magnetic regions meet the magnetic characteristic of genuine notes and then are further detected, and the magnetic algorithm of raising is known
Other efficiency.
Above in association with the specific embodiment technical principle that the invention has been described.These descriptions are intended merely to explain the present invention's
Principle, and limiting the scope of the invention cannot be construed in any way.Based on explanation herein, the technology of this area
Personnel would not require any inventive effort the other embodiments that can associate the present invention, these modes are fallen within
Within protection scope of the present invention.
Claims (10)
- A kind of 1. method for eliminating magnetic spot noise on press-note axis, it is characterised in that including：Obtain the magnetic data image of bank note；Region segmentation is carried out to the magnetic data image, obtains non-magnetic region；Obtain the doubt magnetic block in the non-magnetic region；Determine that the doubt magnetic block is less than or equal to preset threshold value for the area of during cycle distribution and doubt magnetic block, to described Doubt magnetic block is filtered；Wherein, the doubt magnetic block, specifically, occur the magnetic block of magnetic point in non-magnetic region, the magnetic point is, When background amplitude is 2000, amplitude is more than 2150 and/or the magnetic point less than 1850.
- A kind of 2. method for eliminating magnetic spot noise on press-note axis according to claim 1, it is characterised in that：It is described that region segmentation is carried out to the magnetic data image, non-magnetic region is obtained, including：According to the magnetic data figure Magnetic data as in, carries out region segmentation to the magnetic data image, it is magnetic to be partitioned into crown word number magnetic regions, anti-counterfeiting line Region and pattern magnetic regions, in the side of anti-counterfeiting line magnetic regions and above and below crown word number magnetic regions, point Cut out two non-magnetic regions, anti-counterfeiting line magnetic regions opposite side and above and below the pattern magnetic regions, point Cut out two non-magnetic regions.
- A kind of 3. method for eliminating magnetic spot noise on press-note axis according to claim 2, it is characterised in that：The magnetic data of the magnetic data image of the bank note is divided into 18 row, 1386 rows, and each column is as a passage；It is described to determine that the doubt magnetic block is distributed for during cycle, including：Passage is in the doubt where determining doubt magnetic block The position of the preset quantity row of magnetic block above or below, there are the same or similar another doubt magnetic block, then draws doubt Magnetic block is distributed for during cycle, the preset quantity behavior 560-600 rows；The area of the doubt magnetic block is less than or equal to preset threshold value, including, determine the doubt magnetic block area be less than etc. In 40 ranks；The area of the doubt magnetic block is：Using behavior ordinate, row coordinate system is established as ordinate for abscissa, amplitude；When ordinate is 2350 and 1850, put down Row XOY plane makees the section of magnetic data respectively；Take in two sections, the corresponding columns of maximum abscissa, minimum abscissa pair The corresponding line number of columns, maximum ordinate answered line number corresponding with minimum ordinate；The area of doubt magnetic block=(maximum is vertical The corresponding line number of the coordinate-corresponding line number+1 of minimum ordinate) × (the corresponding columns of maximum abscissa-minimum abscissa corresponds to Columns+1) ranks；It is described that the doubt magnetic block is filtered, including, using Fourier transformation the passage where doubt magnetic block Magnetic data is converted into magnet passage schematic diagram, and the magnet passage schematic diagram is filtered.
- 4. a kind of method for eliminating magnetic spot noise on press-note axis according to claim 2, it is characterised in that described to institute State magnetic data image and carry out region segmentation, after obtaining non-magnetic region, the doubt obtained in the non-magnetic region Before magnetic block, further include：Determine that the crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions meet genuine notes Magnetic characteristic.
- A kind of 5. method for eliminating magnetic spot noise on press-note axis according to claim 4, it is characterised in that：The doubt magnetic block obtained in the non-magnetic region, including：Magnetic statistics is carried out to the non-magnetic region, is obtained Obtain the doubt magnetic block that one or more of non-magnetic region region occurs.
- A kind of 6. method for eliminating magnetic spot noise on press-note axis according to claim 3, it is characterised in that the basis Magnetic data in the magnetic data image, region segmentation is carried out to the magnetic data image, is partitioned into crown word number magnetism Region, anti-counterfeiting line magnetic regions and pattern magnetic regions, specifically include：The number of 18 passage magnetic points is counted, the largest number of passages of magnetic point are anti-counterfeiting line magnetic regions；According to anti-counterfeiting line magnetic regions and bank note towards correspondence, determine crown word number magnetic regions and pattern magnetic area Domain.
- A kind of 7. system for eliminating magnetic spot noise on press-note axis, it is characterised in that including：Acquisition module, obtains the magnetic data image of bank note；Split module, region segmentation is carried out to the magnetic data, obtains non-magnetic region；Module is obtained, obtains the doubt magnetic block of the non-magnetic region；Filter module, determines that the doubt magnetic block is less than or equal to preset threshold for the area of during cycle distribution and doubt magnetic block Value, is filtered the doubt magnetic block；Wherein, the doubt magnetic block, specifically, occur the magnetic block of magnetic point in non-magnetic region, the magnetic point is, When background amplitude is 2000, amplitude is more than 2150 and/or the magnetic point less than 1850.
- A kind of 8. system for eliminating magnetic spot noise on press-note axis according to claim 7, it is characterised in that the segmentation Module, is specifically used for, and according to the magnetic data in the magnetic data image, region point is carried out to the magnetic data image Cut, be partitioned into crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions, in the side of anti-counterfeiting line magnetic regions and Above and below crown word number magnetic regions, two non-magnetic regions are partitioned into, in the opposite side of anti-counterfeiting line magnetic regions And above and below pattern magnetic regions, it is partitioned into two non-magnetic regions.
- A kind of 9. system for eliminating magnetic spot noise on press-note axis according to claim 8, it is characterised in that：The magnetic data of the magnetic data image of the bank note is divided into 18 row, 1386 rows, and each column is as a passage；The filter module includes：Cycle determination unit, determines the preset quantity row of passage where doubt magnetic block in the doubt magnetic block above or below Position, there are the same or similar another doubt magnetic block, then show that doubt magnetic block is distributed for during cycle, described preset 560~600 row of quantity behavior；Area determination unit, determines that the area of the doubt magnetic block is less than or equal to 40 ranks；The area of the doubt magnetic block is：The area of doubt magnetic block=(maximum ordinate-minimum ordinate+1) × (maximum abscissa-minimum abscissa+1) Ranks, ordinate correspond to the line number of the magnetic data, and abscissa corresponds to the columns of the magnetic data；The magnetic data of passage where doubt magnetic block, magnet passage signal is converted into using Fourier transformation by filter unit Figure, is filtered the magnet passage schematic diagram.
- 10. a kind of system for eliminating magnetic spot noise on press-note axis according to claim 9, it is characterised in that described to obtain Module is obtained, is additionally operable to, determines that the crown word number magnetic regions, anti-counterfeiting line magnetic regions and pattern magnetic regions meet the magnetic of genuine notes Property feature.
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| CN108074319A (en) * | 2016-11-11 | 2018-05-25 | 深圳怡化电脑股份有限公司 | The false distinguishing method and device of magnetic signal |
| CN107369240B (en) * | 2017-07-10 | 2020-03-27 | 深圳怡化电脑股份有限公司 | Paper money counterfeit discrimination method and device, computer and storage medium |
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