CN103593907B - A kind of detection foreign body method - Google Patents
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- CN103593907B CN103593907B CN201310553957.4A CN201310553957A CN103593907B CN 103593907 B CN103593907 B CN 103593907B CN 201310553957 A CN201310553957 A CN 201310553957A CN 103593907 B CN103593907 B CN 103593907B
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
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Abstract
The invention provides a kind of paper currency high-speed identification device and detection foreign body method thereof, described device includes transmission channel, imageing sensor group, Magnetic Sensor, one group of opposite type sensor, on the premise of the paper money recognition speed keeping paper currency high-speed identification device and precision, imageing sensor group is utilized to replace the major function of the two groups of opposite type sensor reduced, device inside is carried out foreign bodies detection, enhances the accuracy of foreign bodies detection；Decrease two groups of opposite type sensor, and then reduce the complexity of board design, components' placement, simplify apparatus structure, reduce the volume of paper currency high-speed identification device, reduce the manufacturing cost of device.
Description
Technical field
The present invention relates to paper money recognition technological system field, particularly relate to a kind of paper currency high-speed identification device and detect different
Thing method.
Background technology
Fig. 1 is the paper money identifier currently used, as it is shown in figure 1, arrange correlation in the front end of imageing sensor group 10
Type optical pickocff 20, the front end of Magnetic Sensor 130 arrange correlation type optical pickocff the 21, first imageing sensor group front end and set
Put correlation type optical pickocff 22, realize paper money recognition whereby.Correlation type optical pickocff also has a critical function to be detection dress
Put whether retained foreign body.
But, owing to correlation type sensor is too many, cause corresponding control circuit, communication cable, power cable etc. other
Element is complicated, various, and then makes the layout of device there is redundancy, and the volume ratio of device is relatively big, adds manufacturing cost,
Increasingly can not meet that the development trend that becomes more meticulous of finance device product, i.e. volume are little, processing speed block, capacity are big, precision is high.
Summary of the invention
In view of this, the present invention provides a kind of paper currency high-speed identification device and detection foreign body method thereof, to solve above-mentioned one
Series of problems.
A kind of paper currency high-speed identification device, including: transmission channel, imageing sensor group, Magnetic Sensor, one group of correlation sensing
Device；
Described imageing sensor group, for identifying the initial information of bank note and according to described initial information, identifies the figure of bank note
As true and false information, and detect whether described device exists foreign body；
Described Magnetic Sensor is for according to described initial information, identifying the magnetic true and false information of bank note；
Described opposite type sensor enters its interior moment for detecting bank note.
Preferably, imageing sensor group includes；First imageing sensor and the second imageing sensor；
The initial information of described first imageing sensor identification bank note, and detect whether described device exists foreign body；Institute
State the second imageing sensor according to described initial information, identify the image true-false information of bank note, and whether detect described device
There is foreign body.
A kind of detection foreign body method, based on paper currency high-speed identification device, described device includes: transmission channel, image sensing
Device group, Magnetic Sensor, one group of opposite type sensor；
Described method includes:
Paper currency high-speed identification device enters foreign bodies detection pattern, triggers imageing sensor group n time, obtains n row signal, is formed
Array signal, described n is positive integer；
Connected domain in detection array signal, selects the connected domain that area is maximum；
Calculate the height of the maximum connected domain of described area, if height is more than threshold value, then judge foreign body to be detected, otherwise,
Judge to be not detected by foreign body.
Preferably, described n is more than 1, and described array signal is two-dimensional array signal.
Preferably, also include before the connected domain in detection array signal:
The mode using High frequency filter removes the random noise in two-dimensional array signal.
Preferably, described n is 1, and described array signal is one-dimensional array signal.
A kind of detection foreign body method, based on paper currency high-speed identification device, described device includes: transmission channel, image sensing
Device group, Magnetic Sensor, one group of opposite type sensor；
Described method includes:
S1, paper currency high-speed identification device enter foreign bodies detection pattern, trigger imageing sensor group n time, obtain n row signal,
Forming array signal, described n is positive integer；
Connected domain in S2, detection array signal, calculates the height of connected domain；If described height is less than threshold value, then continue
The height of other connected domains in detection, computing array signal, until having detected the connected domain in array signal, then judges do not have
Foreign body detected, otherwise, if height is more than threshold value, then judges foreign body to be detected, stop.
Preferably, described n is more than 1, and described array signal is two-dimensional array signal.
Preferably, described S2 is:
A line signal in A1, selected array signal；
A2, detect non-zero point from left to right, make it as the starting point of connected domain, calculate the height of connected domain, if the most non-
0, perform A3；Without non-zero point being detected, continuing to detect from next line signal, performing A2, until having detected all row；
Whether the point below A3, the current point of detection is 0, if not being 0, the point of lower section is set to current point, and height increases 1,
Reenter A3 step, if 0, perform A4；
Whether A4, the point of detection current some right are 0, if not being 0, the point of right being set to current point, performing A3, as
Fruit is 0, performs A5；
If A5 height is more than threshold value, then judge foreign body to be detected；If highly less than threshold value, then continually looking for other
The starting point of connected domain, performs A2.
Preferably, described n is 1, and described array signal is one-dimensional array signal.
A kind of paper currency high-speed identification device and the detection foreign body method of present invention offer are provided, are keeping paper currency high-speed identification
On the premise of the paper money recognition speed of device and precision, imageing sensor group is utilized to replace the master of the two groups of opposite type sensor reduced
Want function, device inside is carried out foreign bodies detection, enhance the accuracy of foreign bodies detection；Decrease two groups of opposite type sensor, enter
And reduce the complexity of board design, components' placement, simplify apparatus structure, reduce device volume, manufacturing cost
Reduce.
Accompanying drawing explanation
Fig. 1 is the structural representation of the paper money identifier currently used；
Fig. 2 is paper currency high-speed identification device one preferred structure schematic diagram disclosed in the embodiment of the present invention；
Fig. 3 is the primary signal schematic diagram that the present invention implements that disclosed sensor scan bank note obtains;
Fig. 4 is imageing sensor group scanning motion banknote image schematic diagram disclosed in the embodiment of the present invention；
Fig. 5 is the picture signal schematic diagram that imageing sensor group disclosed in the embodiment of the present invention obtains；
Fig. 6 is a kind of flow chart detecting foreign body disclosed in the embodiment of the present invention；
Fig. 7 is the flow chart of another kind of detection foreign body disclosed in the embodiment of the present invention；
Fig. 8 is the flow chart that the present invention implements disclosed a kind of method for optimizing；
Fig. 9 a is foreign schematic diagram in device disclosed in the embodiment of the present invention；
Fig. 9 b is the signal pattern that in Fig. 9 a disclosed in the embodiment of the present invention, imageing sensor group obtains；
Fig. 9 c is the signal pattern obtained after Fig. 9 b disclosed in the embodiment of the present invention filters；
Fig. 9 d is that the embodiment of the present invention is disclosed obtains the connected domain that area is maximum；
Figure 10 a is the schematic diagram of the interior residual bank note of device disclosed in the embodiment of the present invention；
Figure 10 b is the signal pattern that in Figure 10 a disclosed in the embodiment of the present invention, imageing sensor group obtains；
Figure 10 c is the signal pattern obtained after Figure 10 b disclosed in the embodiment of the present invention filters；
Figure 10 d is that the embodiment of the present invention is disclosed obtains the maximum connected domain of area and height image thereof；
Figure 11 a is the schematic diagram of the interior residual fritter scraps of paper of device disclosed in the embodiment of the present invention；
Figure 11 b is the signal pattern that in Figure 11 a disclosed in the embodiment of the present invention, imageing sensor group obtains；
Figure 11 c is the signal pattern obtained after Figure 11 b disclosed in the embodiment of the present invention filters；
Figure 11 d is that the embodiment of the present invention is disclosed obtains the maximum connected domain of area and height image thereof.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
The embodiment of the present invention provides a kind of paper currency high-speed identification device, and detection based on paper currency high-speed identification device is different
Thing method.
Paper currency high-speed identification device disclosed in the embodiment of the present invention includes: transmission channel, imageing sensor group, magnetic sense
Device, one group of opposite type sensor；
Imageing sensor group is for identifying the initial information of bank note, and according to initial information, identifies the image true-false of bank note
Information, and detect whether described device exists foreign body.Initial information include the currency type of bank note, face amount, towards etc. information, figure
The information such as surface image and the transmission image of bank note are included as true and false information.Magnetic Sensor, for according to initial information, identifies
The magnetic true and false information of bank note, magnetic true and false information includes magnetic ink information and the metallic airbag line coding info of note surface
Deng.One group of opposite type sensor is positioned at the front end of imageing sensor group, and detection bank note enters the moment of opposite type sensor.
Fig. 2 is preferred embodiment disclosed by the invention, sees Fig. 2, and imageing sensor group includes: the first imageing sensor and
Second imageing sensor；
First first imageing sensor identifies bank note initial information, it is determined that the currency type of bank note, face amount, towards etc. information.
Magnetic Sensor, according to initial information, identifies magnetic ink information and the metallic airbag line coding info of note surface targetedly
Deng.Second imageing sensor image, according to initial information, identifies surface image and the transmission image etc. of bank note targetedly.By
In the first imageing sensor first determine the currency type of bank note, face amount, towards etc. initial information, Magnetic Sensor and the second image pass
Sensor absorbs specific anti-counterfeiting mark information according to initial information, therefore can be by effectively identifying corresponding true and false information.
The present invention, on the basis of the paper money recognition speed maintaining device and precision, utilizes imageing sensor group to replace subtracting
The major function of two groups of few opposite type sensor, enhances the accuracy of foreign bodies detection.
First, the paper money recognition principle of apparatus of the present invention is: the first situation, bank note is translational speed in the passage of device
Stable.Because the layout of the devices such as the sensor within device is fixing, therefore opposite type sensor and imageing sensor group, magnetic
The distance of sensor is fixing.Opposite type sensor detects bank note and enters the moment of its investigative range, it is known that paper currency transmission
Speed, and then bank note enters imageing sensor group, the moment of Magnetic Sensor can be obtained by calculating, therefore, each sensor
Startup time can obtain.
The second situation, owing to the structure of special reason such as device designs designs such as including motor, bearing, wheel hub,
It cannot be guaranteed that bank note is stable mobile in the passage of device.Opposite type sensor detects bank note and enters the moment of its investigative range,
And then obtain bank note and enter the moment of the first imageing sensor.First imageing sensor is according to sign mutation when bank note being detected
Obtain bank note and entered the exact time of its investigative range, and then calculate the moment of bank note entrance Magnetic Sensor.Magnetic Sensor root
Obtain bank note according to sign mutation when bank note being detected and entered the exact time of its investigative range, and then calculated bank note and enter the
The moment of two imageing sensors.The sign mutation produced during by detection sensor identification bank note, determines that bank note enters sensing
The correct time principle of device, as it is shown on figure 3, the i.e. bank note in position of mark enters the moment.
Secondly, in apparatus of the present invention sense channel, the principle of foreign body is: utilize imageing sensor group to substitute two groups reduced
The foreign bodies detection function of opposite type sensor, under machinery static state, applied image sensor group obtains row signal, utilizes row signal
Feature, it is judged that whether there is foreign body in device.One group of opposite type sensor is made up of some sensors, has certain between them
Spacing distance, and imageing sensor is made up of continuous print photo-sensitive cell, and the interval of photo-sensitive cell is negligible, if
Foreign body is less than the interval between each sensor in one group of opposite type sensor, and opposite type sensor the most probably cannot detect different
Thing, then imageing sensor detects that the accuracy of foreign body will be apparently higher than opposite type sensor.
Imageing sensor gathers the principle of picture signal: imageing sensor triggers and once gathers a line image information, bank note
Moving at device passage, imageing sensor is pressed certain frequency and is triggered, and gathers multirow signal, just can get the complete of certain resolution
Banknote image signal.
As shown in Figure 4, frequency f(Hz pressed by imageing sensor) trigger, gather row signal, bank note is the most straight with speed v (m/s)
Line moves, and the longitudinal resolution of image is 0.025f/v(dpi) (counting of per inch scanning).Imageing sensor group collects
Picture signal is as shown in Figure 5.
The present invention, under the paper money recognition speed keeping paper currency high-speed identification device and precision premise, utilizes imageing sensor
Group replaces the major function of the two groups of opposite type sensor reduced, and device inside is carried out foreign bodies detection, enhances foreign bodies detection
Accuracy；Decrease the number of sensor, and then reduce the complexity of board design, components' placement, reduce bank note
The volume of high-speed identification device, reduces the manufacturing cost of device.
Based on above-mentioned paper currency high-speed identification device, the embodiment of the invention discloses a kind of foreign matter detecting method
Seeing Fig. 6, described method includes:
S1, paper currency high-speed identification device enter foreign bodies detection pattern, trigger imageing sensor group n time, obtain n row signal,
Forming array signal, described n is positive integer；
When whether having foreign body in detection device, paper currency high-speed identification device enters foreign bodies detection pattern, triggers image sensing
Device group n time, obtains n row signal, forms array signal.Imageing sensor group is preferably: the first imageing sensor and the second figure
As sensor, therefore, form two group pattern signals.
When n is 1, imageing sensor only acquires a line signal, and formation is one-dimensional array signal, it is judged that foreign body process ratio
Easier, but signal acquisition process is probably due to the impact (such as electric field, magnetic field, the impact of mechanical movement) of system environments produces
Noise, such as Figure 10, thus cause erroneous judgement.
In order to improve the degree of accuracy of detection, imageing sensor needs to gather more signal, when n is more than 1, and imageing sensor
Gather n row signal, form two-dimensional array signal, at this moment use High frequency filter mode, remove the stochastic signal in two-dimensional array.
Connected domain in S2, detection array signal, selects the connected domain that area is maximum；
When n is 1, detection one-dimensional array signal is more than the some set of 0, selects the connected domain that area is maximum.
When n is more than 1, the connected domain in detection two-dimensional array signal, select the connected domain that area is maximum.
S3, calculate the height of the maximum connected domain of described area, if height is more than threshold value, then judge foreign body to be detected, no
Then, it is judged that be not detected by foreign body.
When n is 1, it is judged that whether one-dimensional array signal exists the set of non-zero continuity point, if it is not, judge to be not detected by
Foreign body, if so, judges foreign body to be detected.
When n is more than 1, the height h that the largest connected territory of reference area accounts for, if height h is more than threshold value H(such as, threshold value is set to
10), it is judged that device detects foreign body, otherwise, it is judged that be not detected by foreign body.
It is equally based on above-mentioned paper currency high-speed identification device, the method that the embodiment of the invention discloses another kind of detection foreign body；
Seeing Fig. 7, described method includes:
S1, paper currency high-speed identification device enter foreign bodies detection pattern, trigger imageing sensor group n time, obtain n row signal,
Forming array signal, described n is positive integer；
When n is 1, imageing sensor only triggers once, gathers a line signal, forms one-dimensional array signal.
When n is more than 1, imageing sensor triggers n time, gathers n row signal, forms two-dimensional array signal, at this moment uses high frequency
Filtering mode, removes the stochastic signal in two-dimensional array.
Connected domain in S2, detection array signal, calculates the height of connected domain；If described height is less than threshold value, then continue
The height of other connected domains in detection, computing array signal, until having detected the connected domain in array signal, then judges not
Foreign body detected, otherwise, if height is more than threshold value, then judges foreign body to be detected, terminate this flow process.
When n is 1, present in detection one-dimensional array signal, value is the set of non-zero continuity point, if so, judges to detect
Foreign body, if it is not, judge to be not detected by foreign body.
When n is more than 1, with reference to a line signal in Fig. 8, A1, selected array signal；
A2, detect non-zero point from left to right, make it as the starting point of connected domain, calculate the height of connected domain, if the most non-
0, perform A3；Without non-zero point being detected, continuing to detect from next line signal, performing A2, until having detected all row；
Below A3, the current point of detection, whether the point of (y-coordinate adds 1) is 0, if not being 0, is set to currently by the point of lower section
Point, height increases 1, reenters A3 step, if 0, performs A4；
Whether the point of right (x coordinate adds 1) is currently put in A4, detection is 0, if not being 0, is set to currently by the point of right
Point, performs A3, if 0, performs A5；
If A5 height is more than threshold value, then judge foreign body to be detected；If highly less than threshold value, then continually looking for other
The starting point of connected domain, performs A2.
Because the signal of image sensor scan is metastable, actual application has only to search for above 10 row letter
Number, it is already possible to meet the precision of foreign bodies detection.
Below, the process simulation of three typical case of above-mentioned foreign matter detecting method is listed:
As shown in Fig. 9 a-9d, the first situation, the detection case simulation of foreign.
Foreign in device as illustrated in fig. 9, the signal pattern that when Fig. 9 b is foreign, imageing sensor group obtains, Fig. 9 c
For the signal pattern obtained after the signal pattern filtering that imageing sensor group during foreign obtains, Fig. 9 d is for obtaining area in Fig. 9 c
Maximum connected domain.The connected domain of area maximum is that noise causes, and its area is the least, is highly unsatisfactory for condition, it is judged that be as good as
Thing.
As shown in figures 10 a-10d, the second situation, device leaves bank note, the major part of bank note againsts imageing sensor.
As shown in Figure 10 a, residual bank note in device, the major part of bank note againsts imageing sensor, and Figure 10 b is image sensing
The signal pattern that device obtains when the major part of bank note againsts imageing sensor, Figure 10 c is the letter obtained after signal pattern filters
Number image, Figure 10 d is to obtain the maximum connected domain of area and height image thereof.Connected domain in scanning image out is width
Wider rectangular area, it highly meets condition, it is judged that have foreign body.
As shown in Figure 11 a-11d, the third situation, device exists fritter foreign body, such as paper scrap, it is attached to imageing sensor
Part less.
Figure 11 a is shown, and the residual fritter scraps of paper in device, its part being attached to imageing sensor is less, and Figure 11 b is image
When sensor remains the fritter scraps of paper in device, it is thus achieved that signal pattern, Figure 11 c is the signal pattern that obtains after Figure 11 b filtering,
Figure 11 d is to obtain the maximum connected domain of area and height image thereof.Scan out the square that the connected domain in image is narrower width
Shape region, it the most also meets condition, it is judged that foreign body detected.
The correlation technique of imageing sensor is applied to present device the most maturely, improved method in this paper,
Prior art can be directly utilized, upgrade on its basis, it is not necessary to setting of the software and hardware architecture of change signal pattern sensing system
Meter scheme, only need to revise the part of detection algorithm, greatly save and design and develop cost.
The present invention proposes a kind of paper currency high-speed identification device and foreign matter detecting method thereof, has simplified two groups of correlation sensings
Device, utilizes existing imageing sensor to detect device internal motion bank note (other medium), and enters device inside
The static foreign bodies detection of row, thus keep paper money recognition speed and the precision of existing apparatus, and strengthen the accuracy of foreign bodies detection.
After having simplified two groups of opposite type sensor, simplifying the structure identifying device, reduce the volume of device, in actual application, device sets
Meter length, the most all reduce 1/5 than existing scheme, manufacturing cost is decreased obviously.
Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like be used merely to by
One entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operation
Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant meaning
Containing comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that
A little key elements, but also include other key elements being not expressly set out, or also include for this process, method, article or
The key element that equipment is intrinsic.In the case of there is no more restriction, statement " including ... " key element limited, and
It is not precluded within and includes the process of described key element, method, article or equipment there is also other identical element.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (1)
1. a detection foreign body method, it is characterised in that based on paper currency high-speed identification device, described device includes: transmission channel,
Imageing sensor group, Magnetic Sensor, one group of opposite type sensor；Described imageing sensor group for identify bank note initial information and
According to described initial information, identify the image true-false information of bank note, and detect whether described device exists foreign body；Described magnetic passes
Sensor is for according to described initial information, identifying the magnetic true and false information of bank note；Described opposite type sensor is used for detecting bank note and enters
Its interior moment；
Described method includes:
S1, paper currency high-speed identification device enter foreign bodies detection pattern, trigger imageing sensor group n time, obtain n row signal, are formed
Array signal, described n is positive integer, and described n is more than 1, and described array signal is two-dimensional array signal；
Connected domain in S2, detection array signal, calculates the height of connected domain；If described height is less than threshold value, then continue detection,
The height of other connected domains in computing array signal, until having detected the connected domain in array signal, then judges not detection
To foreign body, otherwise, if height is more than threshold value, then judges foreign body to be detected, terminate this flow process；
Wherein, described S2 is:
A line signal in A1, selected array signal；
A2, detect non-zero point from left to right, make it as the starting point of connected domain, calculate the height of connected domain, if the most non-zero, hold
Row A3；Without non-zero point being detected, continuing to detect from next line signal, performing A2, until having detected all row；
Whether the point below A3, the current point of detection is 0, if not being 0, the point of lower section is set to current point, highly increasing 1, again
Enter A3 step, if 0, perform A4；
Whether A4, the point of detection current some right are 0, if not being 0, the point of right being set to current point, performing A3, if
0, perform A5；
If A5 height is more than threshold value, then judge foreign body to be detected；If highly less than threshold value, then continually look for other connections
The starting point in territory, performs A2.
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| CN201310553957.4A CN103593907B (en) | 2013-11-08 | 2013-11-08 | A kind of detection foreign body method |
| PCT/CN2014/071198 WO2015066978A1 (en) | 2013-11-08 | 2014-01-23 | High-speed banknote recognition device and foreign matter detection method thereof |
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| CN201310553957.4A CN103593907B (en) | 2013-11-08 | 2013-11-08 | A kind of detection foreign body method |
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| CN104802514B (en) * | 2015-05-13 | 2017-12-22 | 广州广电运通金融电子股份有限公司 | A kind of flaky medium detection means of surface mount foreign matter |
| CN107123185A (en) * | 2017-06-20 | 2017-09-01 | 深圳怡化电脑股份有限公司 | A kind of identifying device and method of valuable document magnetic character |
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| WO2015066978A1 (en) | 2015-05-14 |
| CN103593907A (en) | 2014-02-19 |
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