CN107527422A - A kind of offset printing is to print detection method, device, terminal device and readable storage medium storing program for executing - Google Patents
A kind of offset printing is to print detection method, device, terminal device and readable storage medium storing program for executing Download PDFInfo
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- CN107527422A CN107527422A CN201710532785.0A CN201710532785A CN107527422A CN 107527422 A CN107527422 A CN 107527422A CN 201710532785 A CN201710532785 A CN 201710532785A CN 107527422 A CN107527422 A CN 107527422A
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- 238000007645 offset printing Methods 0.000 title claims abstract description 310
- 238000001514 detection method Methods 0.000 title claims abstract description 48
- 238000003860 storage Methods 0.000 title claims abstract description 14
- 238000007639 printing Methods 0.000 claims abstract description 26
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- 238000005516 engineering process Methods 0.000 description 3
- 230000006399 behavior Effects 0.000 description 2
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Classifications
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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
- G07D7/20—Testing patterns thereon
- G07D7/2016—Testing patterns thereon using feature extraction, e.g. segmentation, edge detection or Hough-transformation
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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
- G07D7/20—Testing patterns thereon
- G07D7/2008—Testing patterns thereon using pre-processing, e.g. de-blurring, averaging, normalisation or rotation
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Abstract
The invention belongs to financial machine and tool field, more particularly to a kind of offset printing is to print detection method, device, terminal device and readable storage medium storing program for executing.Methods described obtains the obverse and reverse reflected image of target bank note, and offset printing therein is extracted respectively to being patterned, after by one of offset printing to being patterned progress flip horizontal, both edge contour pixel groups are extracted respectively and calculate the number of coincident pixel point, if the number of the coincident pixel point is fallen into default number range, then judge that the offset printing of the target bank note is normal to printing, if the number of the coincident pixel point exceeds the number range, judge that the offset printing of the target bank note is abnormal to print.Print is detected by the invention it is possible to carry out effective offset printing merely with the reflectogram acquired in existing detection device, saves the cost that upgrading is carried out to existing equipment.
Description
Technical field
The invention belongs to financial machine and tool field, more particularly to a kind of offset printing is to print detection method, device, terminal device and can
Read storage medium.
Background technology
Paper money recognition is one of basic function of all kinds of ATMs, and its cardinal principle is to utilize the various marks set on bank note
Know to judge the true and false of bank note, come into the market with anti-forge coin, influence normal financial order.
Offset printing is a kind of important anti-counterfeiting technology on bank note to being patterned, it is characterized in that being respectively printed on a part of figure in positive and negative
Case, translumination observation can find that what the pattern of both sides fitted together perfectly combines.Offset printing is to being patterned on the bank note of various regions all
There is the Diagram of the Supreme Ultimate on flying horse figure and the South Korean Won in utilization, such as Hongkong dollar.RMB also adds this anti-counterfeiting characteristic since 2005 editions：
There are a circular local pattern, translumination observation in middle on the right side of main scape pattern, and front pattern is combined into a complete ancient money
Pattern.And 2015 editions newest 100 yuan of corresponding patterns for being then changed to " 100 " printed words.
Offset printing only could be observed substantially being patterned in transmitted light, and current detection device can only typically obtain paper
The reflectogram of coin, to obtain transmission plot, then need to carry out upgrading to existing equipment, add extra identification cost.
The content of the invention
In view of this, the embodiments of the invention provide a kind of offset printing to print detection method, device, terminal device and readable to deposit
Storage media, when being detected in the prior art by obtaining transmission plot to carry out offset printing to print with solution, existing equipment need to be carried out
Upgrading, the problem of adding extra identification cost.
The first aspect of the embodiment of the present invention provides a kind of offset printing to printing detection method, can include：
The head-on reflection image and backside reflection image of target bank note are obtained respectively；
The first offset printing in the head-on reflection image is extracted to being patterned；
The second offset printing in the backside reflection image is extracted to being patterned；
To first offset printing to being patterned with second offset printing to one of carry out flip horizontal in being patterned,
The 3rd offset printing is obtained to being patterned, another holding is constant, is designated as the 4th offset printing to being patterned；
The 3rd offset printing is extracted respectively to the first edge contour pixel group being patterned and the 4th offset printing to impression
The second edge contour pixel group of case；
Calculate the number of the coincident pixel point of the first edge contour pixel group and the second edge contour pixel group；
If the number of the coincident pixel point is fallen into default number range, the offset printing pair of the target bank note is judged
Print is normal；
If the number of the coincident pixel point exceeds the number range, judge that the offset printing of the target bank note is different to printing
Often.
Further, first offset printing extracted in the head-on reflection image can include to being patterned：
Estimate first offset printing to the target area being patterned in the head-on reflection image, institute according to predeterminated position
It is first offset printing to the position that is patterned in standard bank note corresponding with the target bank note to state predeterminated position；
Binary conversion treatment is carried out to the image in the target area, obtains target area bianry image；
First offset printing is gone out to being patterned in institute according to the pixel grey scale Distribution and localization of the target area bianry image
State the first position in head-on reflection image；
First offset printing is extracted to being patterned according to the first position.
Further, estimating first offset printing to being patterned in the head-on reflection image according to predeterminated position
Before target area, it can also include：
Binary conversion treatment is carried out to the head-on reflection image of the target bank note, obtains target bank note bianry image；
The corresponding pixel points of the target bank note bianry image and each default standard bank note bianry image are carried out same
Or computing and sum, each matched pixel points are obtained, the standard bank note bianry image is the head-on reflection to standard bank note
Image carries out the image obtained by binary conversion treatment；
Determine the maximum in each matched pixel points；
If the maximum is more than default threshold value, standard bank note corresponding to the maximum is defined as and the mesh
Standard bank note corresponding to millimeter paper coin.
Further, second offset printing extracted in the backside reflection image can include to being patterned：
It is determined that the first offset printing described in the standard bank note to the position being patterned and second offset printing to being patterned
Position between functional relation；
It is anti-at the back side to being patterned that second offset printing is oriented according to the functional relation and the first position
The second place penetrated in image；
Second offset printing is extracted to being patterned according to the second place.
Further, it is described to extract the 3rd offset printing respectively to the first edge contour pixel group being patterned and described
Four offset printings can include to the second edge contour pixel group being patterned：
Using medium filtering respectively to the 3rd offset printing to being patterned with the 4th offset printing to being patterned carry out denoising
Processing, obtain the 3rd offset printing after denoising to be patterned and denoising after the 4th offset printing to being patterned；
Using high-pass filtering respectively to the 3rd offset printing after denoising to be patterned and denoising after the 4th offset printing
Processing is sharpened to being patterned, the 3rd offset printing after being sharpened is to the 4th offset printing after being patterned and sharpening to being patterned；
The 3rd offset printing after sharpening is carried out to the 4th offset printing after being patterned and sharpening to being patterned respectively
Edge connection processing, the 3rd offset printing after being connected is to the 4th offset printing after being patterned and connecting to being patterned；
From the 3rd offset printing after connection to being patterned described in the closed contour conduct that middle selected pixels are counted out most
First edge contour pixel group；
From the 4th offset printing after connection to being patterned described in the closed contour conduct that middle selected pixels are counted out most
Second edge contour pixel group.
The second aspect of the embodiment of the present invention provides a kind of offset printing to printing detection means, can include：
Image collection module, for obtaining the head-on reflection image and backside reflection image of target bank note respectively；
First pattern extraction module, for extracting the first offset printing in the head-on reflection image to being patterned；
Second pattern extraction module, for extracting the second offset printing in the backside reflection image to being patterned；
Flip module, for first offset printing to being patterned with second offset printing to one of them in being patterned
Flip horizontal is carried out, obtains the 3rd offset printing to being patterned, another holding is constant, is designated as the 4th offset printing to being patterned；
Edge extracting module, for extracting the 3rd offset printing respectively to the first edge contour pixel group being patterned and institute
The 4th offset printing is stated to the second edge contour pixel group that is patterned；
First computing module, for calculating the first edge contour pixel group and the second edge contour pixel group
The number of coincident pixel point；
First determination module, if the number for the coincident pixel point is fallen into default number range, judge institute
The offset printing for stating target bank note is normal to printing；
Second determination module, if the number for the coincident pixel point exceeds the number range, judge the mesh
The offset printing of millimeter paper coin is abnormal to print.
Further, the first pattern extraction module can include：
Target area estimation unit, for estimating that first offset printing is anti-in the front to being patterned according to predeterminated position
The target area penetrated in image, the predeterminated position are first offset printing to being patterned in mark corresponding with the target bank note
Position in quasi- bank note；
Target area binarization unit, for carrying out binary conversion treatment to the image in the target area, obtain target
Region bianry image；
First position positioning unit, described in being gone out according to the pixel grey scale Distribution and localization of the target area bianry image
First offset printing is to the first position that is patterned in the head-on reflection image；
First pattern extraction unit, for extracting first offset printing to being patterned according to the first position.
Further, the offset printing can also include to print detection means：
Target bank note binarization block, for carrying out binary conversion treatment to the head-on reflection image of the target bank note, obtain
To target bank note bianry image；
Second computing module, for by the target bank note bianry image and each default standard bank note bianry image
Corresponding pixel points carry out same or computing and summed, and obtain each matched pixel points, and the standard bank note bianry image is to mark
The head-on reflection image of quasi- bank note carries out the image obtained by binary conversion treatment；
Maximum determining module, for determining the maximum in each matched pixel points；
Standard bank note determining module, if being more than default threshold value for the maximum, by corresponding to the maximum
Standard bank note is defined as standard bank note corresponding with the target bank note.
Further, the second pattern extraction module can include：
Functional relation determining unit, for determine the first offset printing described in the standard bank note to the position that is patterned and
Second offset printing is to the functional relation between the position that is patterned；
Second place positioning unit, for orienting second offset printing according to the functional relation and the first position
To the second place being patterned in the backside reflection image；
Second pattern extraction unit, for extracting second offset printing to being patterned according to the second place.
Further, the edge extracting module can include：
Median filter unit, for using medium filtering respectively to the 3rd offset printing to being patterned and the 4th offset printing
To being patterned carry out denoising, obtain the 3rd offset printing after denoising to be patterned and denoising after the 4th offset printing to being patterned；
High pass filter unit, for using high-pass filtering respectively to the 3rd offset printing after denoising to being patterned and denoising
The 4th offset printing afterwards is sharpened processing to being patterned, and the 3rd offset printing after being sharpened is to after being patterned and sharpening
Four offset printings are to being patterned；
Edge connection unit, for respectively to the 3rd offset printing after sharpening to the described 4th after being patterned and sharpening
Offset printing carries out edge connection processing to being patterned, and the 3rd offset printing after being connected is to the 4th offset printing pair after being patterned and connecting
It is patterned；
First edge chooses unit, for being counted out most from the 3rd offset printing after connection to being patterned middle selected pixels
More closed contours is as the first edge contour pixel group；
Second edge chooses unit, for being counted out most from the 4th offset printing after connection to being patterned middle selected pixels
More closed contours is as the second edge contour pixel group.
The third aspect of the embodiment of the present invention provides a kind of offset printing to printing detection terminal equipment, including memory, processing
Device and it is stored in the computer program that can be run in the memory and on the processor, it is characterised in that the place
Reason device realizes the step of any of the above offset printing is to print detection method when performing the computer program.
The fourth aspect of the embodiment of the present invention provides a kind of computer-readable recording medium, the computer-readable storage
Media storage has computer program, it is characterised in that the computer program realizes any of the above glue when being executed by processor
The step of print is to print detection method.
The existing compared with prior art beneficial effect of the present invention is：The present invention obtains the head-on reflection of target bank note respectively
Image and backside reflection image；The first offset printing in the head-on reflection image is extracted to being patterned；Extract the back side
The second offset printing in reflected image is to being patterned；To first offset printing to be patterned with second offset printing to being patterned in
It is one of to carry out flip horizontal, the 3rd offset printing is obtained to being patterned, and another holding is constant, is designated as the 4th offset printing to impression
Case；Extract respectively the 3rd offset printing to the first edge contour pixel group that is patterned and the 4th offset printing to be patterned
Two edge contour pixel groups；Calculate the coincident pixel of the first edge contour pixel group and the second edge contour pixel group
The number of point；If the number of the coincident pixel point is fallen into default number range, the offset printing of the target bank note is judged
It is normal to printing；If the number of the coincident pixel point exceeds the number range, judge the offset printing of the target bank note to print
It is abnormal.By the present invention, the obverse and reverse reflected image of target bank note is obtained, and extracts offset printing therein respectively to impression
Case, after by one of offset printing to being patterned progress flip horizontal, by the coincident pixel for judging edge contour pixel groups
Whether whether the number of point is fallen into default number range normal to being patterned to detect offset printing, can be merely with existing inspection
Reflectogram acquired in measurement equipment carries out effective offset printing and print is detected, save existing equipment is carried out upgrading into
This.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is schematic flow diagram of the offset printing provided in an embodiment of the present invention to print detection method；
Fig. 2 a are offset printing to the schematic diagram that is patterned；
Fig. 2 b are the schematic diagram for carrying out flip horizontal to being patterned to offset printing；
Fig. 3 is the schematic diagram for carrying out edge connection processing to being patterned to offset printing；
Fig. 4 is schematic block diagram of the offset printing provided in an embodiment of the present invention to print detection means；
Fig. 5 is schematic block diagram of the offset printing provided in an embodiment of the present invention to print detection terminal equipment.
Embodiment
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that disclosed below
Embodiment be only part of the embodiment of the present invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
As shown in figure 1, being a kind of offset printing provided in an embodiment of the present invention to printing the schematic flow diagram of detection method, the side
Method can include：
Step S101, the head-on reflection image and backside reflection image of target bank note are obtained respectively.
The target bank note is the bank note to being patterned containing offset printing, for example, the target bank note can be 2005 editions
100 yuans, there is the offset printing of an ancient money pattern its main scape pattern right side middle to being patterned.The target bank note is also
Can be that the Hongkong dollar, South Korean Won and other bank note, the present embodiment that are patterned are not especially limited to this containing offset printing.
Step S102, the first offset printing in the head-on reflection image is extracted to being patterned.
Fig. 2 a be bank note offset printing to the schematic diagram that is patterned, respectively there is a semicircular ring at front and the back side, if viewed in transmittance
A complete annulus can just be synthesized.One group of complete offset printing is by positive first offset printing pair of target bank note to being patterned
The second offset printing with the target bank note back side is patterned to being patterned composition.For example, 100 yuans of fronts of 2005 editions include
The half of ancient coins pattern, i.e., to being patterned, the back side includes second half of ancient coins pattern for described first offset printing, i.e., described second offset printing
To being patterned.
Preferably, step S102 can specifically include：
Step S1021, estimate first offset printing to being patterned in the head-on reflection image according to predeterminated position
Target area.
The predeterminated position is first offset printing to being patterned in standard bank note corresponding with the target bank note
Position.Due to different bank note, such as RMB, Hongkong dollar, South Korean Won all correspond to different offset printings to being patterned, and offset printing is to print
Pattern is in the diverse location of bank note, therefore to determine the currency type of target bank note in advance.
First, binary conversion treatment is carried out to the head-on reflection image of the target bank note, obtains target bank note bianry image.
It is, for example, possible to use adaptive threshold Binarization methods carry out two-value to the head-on reflection image of the target bank note
Change is handled, and is divided the image into less piece, is calculated every piece of histogram respectively, is each block according to the peak value of each histogram
Calculate its threshold value.The threshold value of each pixel is entered row interpolation according to the threshold value of adjacent block and obtained.It should be noted that can be with
Other binary processing methods are chosen according to being actually needed, the present embodiment is not especially limited to this.
Then, the respective pixel of the target bank note bianry image and each default standard bank note bianry image is clicked through
Capable same or computing is simultaneously summed, and obtains each matched pixel points.The standard bank note bianry image is the front to standard bank note
Reflected image carries out the image obtained by binary conversion treatment.
For example, the standard bank note can be respectively RMB, Hongkong dollar, South Korean Won, it is assumed that each standard bank note and the mesh
The bianry image of millimeter paper coin contains 10000 pixels, and the gray value of each pixel is 0 or 1.First by target bank note
Each corresponding pixel points of each pixel and RMB carry out same or computing, and then operation result is summed, if both have
The gray value of 9000 pixels is identical, the gray value for having 1000 pixels be it is different, then its with or computing after again
The result of summation is 9000, namely both matched pixel points are 9000.Similarly, can also try to achieve successively again target bank note with
The matched pixel points of Hongkong dollar, South Korean Won.
Finally, the maximum in each matched pixel points is determined, and it is default to judge whether the maximum is more than
Threshold value.The threshold value can be configured according to actual conditions, for example, 9000,8000,7000 etc. can be set to
Deng the present embodiment is not especially limited to this.
If the maximum is more than the threshold value, standard bank note corresponding to the maximum is defined as and the target
Standard bank note corresponding to bank note.If for example, RMB, Hongkong dollar, South Korean Won matched pixel points be respectively 9000,3000,1000,
And the threshold value is 8000, then RMB is defined as standard bank note corresponding with the target bank note.
If the maximum is less than or equal to the threshold value, it is believed that target bank note and each standard bank note are not
Match somebody with somebody.Can now select other standard bank note to continue to match, if the standard bank note has been matched, but still can not
With success, then it is considered that target bank note is abnormal coin, without carrying out subsequent detection again.
Step S1022, binary conversion treatment is carried out to the image in the target area, obtains target area bianry image.
Step S1023, first offset printing pair is gone out according to the pixel grey scale Distribution and localization of the target area bianry image
The first position being patterned in the head-on reflection image.
Step S1024, first offset printing is extracted to being patterned according to the first position.
The target area is the first offset printing for estimating to be larger than to the possible position region being patterned, its scope
First offset printing is to the actual range that is patterned, it is necessary to further be accurately positioned out the first offset printing to the position that is patterned.
It is for instance possible to use the method for sliding window is accurately positioned, it is assumed that the width of the target area is W, high
Spend for H, and known first offset printing is NW (NW to the width being patterned<W), it is highly NH (NH<H), the first moving window is root
The window formed according to known first offset printing to the height and the width of target area that are patterned, that is, it is W × NH's to choose size
Window, the first moving window is moved line by line, and obtain the pixel grey scale accumulated value of current first moving window region, for
When the pixel grey scale accumulated value of first moving window is maximum, first the first offset printing of behavior of its region is to being patterned
Region initial row.Second moving window is the window that the first offset printing known to is formed to the height and width that are patterned
Mouthful, that is, the window that size is NW × NH is chosen, moves the second moving window by column, and obtain current second moving window location
The pixel grey scale accumulated value in domain, when the pixel grey scale accumulated value for the second moving window is maximum, the of its region
One, which is classified as starting of first offset printing to the region where being patterned, arranges.Finally, according to the initial row, starting row and known the
One offset printing to be patterned height, width, orient first offset printing to be patterned in the head-on reflection image
One position simultaneously extracts first offset printing to being patterned from the first position.
Step S103, the second offset printing in the backside reflection image is extracted to being patterned.
First, it is determined that the first offset printing described in the standard bank note to the position that is patterned and second offset printing to print
Functional relation between the position of pattern.
Then, second offset printing is oriented to being patterned in the back of the body according to the functional relation and the first position
The second place in the reflected image of face.
Finally, second offset printing is extracted to being patterned according to the second place.
For example, it is assumed that the width of target bank note is A, it is highly B, the first offset printing is W to the width being patterned, and is highly
H, and the starting behavior R1 being calculated in step s 102, starting is classified as C1, then by preset function relation R2=B-R1-H, C2
=A-C1-W can in the hope of second offset printing to be patterned in the backside reflection image initial row, starting arrange, and by
In second offset printing to be patterned with first offset printing to be patterned width, height it is consistent, then can orient institute
The second offset printing is stated to the second place that is patterned in the backside reflection image and extracts described from the second place
Two offset printings are to being patterned.
It is especially noted that above step S102 and step S103 are first to position the first offset printing to being patterned, then root
The second offset printing is positioned to the position that is patterned to the functional relation between the position that is patterned according to the first and second offset printings.It is actual
In, the second offset printing can also be first positioned to being patterned, further according to the first and second offset printings between the position that is patterned
Functional relation positions the first offset printing to the position that is patterned.Detailed process is similar with step S102, step S103 description, this
Embodiment repeats no more to this.
Step S104, to first offset printing to being patterned with second offset printing to one of progress in being patterned
Flip horizontal, the 3rd offset printing is obtained to being patterned, another holding is constant, is designated as the 4th offset printing to being patterned.
As shown in Figure 2 b, it is constant to a progress flip horizontal in being patterned, another holding to two offset printings.
The process of the flip horizontal can include：
First, second offset printing is obtained under preset coordinate system to the maximum coordinate value among that is patterned on transverse axis, it is described
Coordinate system using the first pixel as the origin of coordinates, using from first pixel to the direction of the second pixel as transverse axis just
Direction, so that, as longitudinal axis positive direction, first pixel is described from first pixel to the direction of the 3rd pixel
To the pixel in the most lower left corner being patterned, second pixel is that second offset printing is most right to what is be patterned for second offset printing
The pixel of inferior horn, the 3rd pixel are second offset printing to the pixel in the most upper left corner being patterned；
Then, first coordinate value of second offset printing to each pixel in being patterned on transverse axis is obtained；
Finally, according to the maximum coordinate value among and first coordinate value determine after each pixel flip horizontal
The second coordinate value on transverse axis, second coordinate value are equal to the maximum coordinate value among and the difference of first coordinate value.
It should be noted that during the flip horizontal, coordinate of each pixel on y direction is not
Become.
Step S105, the 3rd offset printing is extracted respectively to the first edge contour pixel group being patterned and the 4th glue
Print the second edge contour pixel group to being patterned.
By extracting the edge of offset printing pattern, come analyze the two to print property, if edge just connects, without excessively heavy
Close or mutually from then it may be said that it is completely to print that gelatin, which is patterned,.The process at extraction edge can include：
Step S1051, using medium filtering respectively to the 3rd offset printing to being patterned with the 4th offset printing to impression
Case carry out denoising, obtain the 3rd offset printing after denoising to be patterned and denoising after the 4th offset printing to being patterned.
Edge is the violent place of image change, is consequently belonging to the high fdrequency component of image, but common noise is fallen within
High fdrequency component, therefore denoising is first done to image to reduce interference.
Step S1052, using high-pass filtering respectively to the 3rd offset printing after denoising to be patterned and denoising after institute
State the 4th offset printing and be sharpened processing to being patterned, the 3rd offset printing after being sharpened is to the 4th offset printing after being patterned and sharpening
To being patterned.
After previous step denoising, herein using the method for high-pass filtering, it can be removed by high-pass filtering useless
Low frequency component, maximum reserved high-frequency component, i.e., the marginal information that we need.
Step S1053, respectively to the 3rd offset printing after sharpening to the 4th offset printing pair after being patterned and sharpening
It is patterned and carries out edge connection processing, the 3rd offset printing after being connected is to the 4th offset printing after being patterned and connecting to impression
Case.
As shown in figure 3, each end points in positioning image, the end points is to have in its eight neighborhood and before only one
The special foreground point at sight spot, 16 neighborhoods of its more outer layer are searched, if there is foreground point, by the point between the end points and foreground point
Also it is changed to foreground point.The foreground point is offset printing to the pixel for the edge contour being patterned.
Step S1054, from the 3rd offset printing after connection to being patterned the closure wheel that middle selected pixels are counted out most
Exterior feature is used as the first edge contour pixel group.
Step S1055, from the 4th offset printing after connection to being patterned the closure wheel that middle selected pixels are counted out most
Exterior feature is used as the second edge contour pixel group.
Foregoing obtained edge is not necessarily available, it is also necessary to removes useless line segment, can lead in the present embodiment
Chain code search is crossed, finds a closed contour most long in image, namely the most closed contour of pixel number is as edge
Contour pixel group.
Step S106, calculate the coincident pixel of the first edge contour pixel group and the second edge contour pixel group
The number of point.
Both are placed under the same coordinate system, which picture can determine that by the pixel value for comparing both each pixels
Vegetarian refreshments is coincidence pixel.
Step S107, judges whether the number of the coincident pixel point is fallen into default number range.
The number range can be configured by reference of standard bank note in advance.If for example, coincidence picture of standard bank note
The number of vegetarian refreshments is 1000, then the number range can be arranged to the open interval from 900 to 1100.
If the number of the coincident pixel point is fallen into default number range, step S108 is performed, if the coincidence
The number of pixel exceeds the number range, then performs step S109.
Step S108, judge that the offset printing of the target bank note is normal to printing.
Step S109, judge that the offset printing of the target bank note is abnormal to print.
The embodiment of the present invention obtains the obverse and reverse reflected image of target bank note, and extracts offset printing pair therein respectively
It is patterned, after by one of offset printing to being patterned progress flip horizontal, by the coincidence for judging edge contour pixel groups
Whether whether the number of pixel is fallen into default number range normal to being patterned to detect offset printing, can be merely with existing
Detection device acquired in reflectogram carry out effective offset printing print detected, save and upgrading carried out to existing equipment
Cost.
Corresponding to the offset printing described in foregoing embodiments provided in an embodiment of the present invention one is shown to printing detection method, Fig. 4
Kind offset printing for convenience of description, illustrate only the part related to the embodiment of the present invention, institute to the schematic block diagram of print detection means
Stating device can include：
Image collection module 401, for obtaining the head-on reflection image and backside reflection image of target bank note respectively；
First pattern extraction module 402, for extracting the first offset printing in the head-on reflection image to being patterned；
Second pattern extraction module 403, for extracting the second offset printing in the backside reflection image to being patterned；
Flip module 404, for first offset printing to be patterned with second offset printing in being patterned wherein
One progress flip horizontal, obtains the 3rd offset printing to being patterned, another holding is constant, is designated as the 4th offset printing to being patterned；
Edge extracting module 405, for extracting the 3rd offset printing respectively to the first edge contour pixel group that is patterned
With the 4th offset printing to the second edge contour pixel group that is patterned；
First computing module 406, for calculating the first edge contour pixel group and the second edge contour pixel
The number of the coincident pixel point of group；
First determination module 407, if the number for the coincident pixel point is fallen into default number range, judge
The offset printing of the target bank note is normal to printing；
Second determination module 408, if the number for the coincident pixel point exceeds the number range, judge described in
The offset printing of target bank note is abnormal to print.
Further, the offset printing can also include to print detection means：
Target bank note binarization block 409, for carrying out binary conversion treatment to the head-on reflection image of the target bank note,
Obtain target bank note bianry image；
Second computing module 410, for by the target bank note bianry image and each default standard bank note binary map
The corresponding pixel points of picture carry out same or computing and summed, and obtain each matched pixel points, and the standard bank note bianry image is
To the image obtained by the head-on reflection image progress binary conversion treatment of standard bank note；
Maximum determining module 411, for determining the maximum in each matched pixel points；
Standard bank note determining module 412, it is if being more than default threshold value for the maximum, the maximum is corresponding
Standard bank note be defined as standard bank note corresponding with the target bank note.
Further, the first pattern extraction module 402 can include：
Target area estimation unit 4021, for according to predeterminated position estimate first offset printing to be patterned it is described just
Target area in the reflected image of face, the predeterminated position are first offset printing to being patterned corresponding with the target bank note
Standard bank note in position；
Target area binarization unit 4022, for carrying out binary conversion treatment to the image in the target area, obtain
Target area bianry image；
First position positioning unit 4023, for being gone out according to the pixel grey scale Distribution and localization of the target area bianry image
First offset printing is to the first position that is patterned in the head-on reflection image；
First pattern extraction unit 4024, for extracting first offset printing to being patterned according to the first position.
Further, the second pattern extraction module 403 can include：
Functional relation determining unit 4031, for determining the first offset printing described in the standard bank note to the position that is patterned
Put and second offset printing is to the functional relation between the position that is patterned；
Second place positioning unit 4032, for orienting described second according to the functional relation and the first position
Offset printing is to the second place that is patterned in the backside reflection image；
Second pattern extraction unit 4033, for extracting second offset printing to being patterned according to the second place.
Further, the edge extracting module 405 can include：
Median filter unit 4051, for using medium filtering respectively to the 3rd offset printing to being patterned and the described 4th
Offset printing to being patterned carry out denoising, obtain the 3rd offset printing after denoising to be patterned and denoising after the 4th offset printing to impression
Case；
High pass filter unit 4052, for using high-pass filtering respectively to the 3rd offset printing after denoising to being patterned and
The 4th offset printing after denoising is sharpened processing to being patterned, after the 3rd offset printing after being sharpened is to being patterned and sharpening
The 4th offset printing to being patterned；
Edge connection unit 4053, for respectively to the 3rd offset printing after sharpening to described in after being patterned and sharpening
4th offset printing carries out edge connection processing to being patterned, and the 3rd offset printing after being connected is to the 4th glue after being patterned and connecting
Print is to being patterned；
First edge chooses unit 4054, for being counted from the 3rd offset printing after connection being patterned middle selected pixels
The most closed contour of mesh is as the first edge contour pixel group；
Second edge chooses unit 4055, for being counted from the 4th offset printing after connection being patterned middle selected pixels
The most closed contour of mesh is as the second edge contour pixel group.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
It should be understood that the size of the sequence number of each step is not meant to the priority of execution sequence in above-mentioned each embodiment, respectively
The execution sequence of process should determine that the implementation process without tackling the embodiment of the present invention forms any with its function and internal logic
Limit.
Fig. 5 is schematic block diagram of the offset printing provided in an embodiment of the present invention to print detection terminal equipment.As shown in figure 5, the reality
Apply the offset printing of example includes to print detection terminal equipment 5：Processor 50, memory 51 and it is stored in the memory 51 and can
The computer program 52 run on the processor 50.The processor 50 is realized above-mentioned when performing the computer program 52
Each offset printing is to the step in print detection method embodiment, such as the step S101 to step S109 shown in Fig. 1.It is or described
Processor 50 realizes the function of each module/unit in above-mentioned each device embodiment, such as Fig. 4 when performing the computer program 52
Shown module 401 to module 408 function.
Exemplary, the computer program 52 can be divided into one or more module/units, it is one or
Multiple module/units are stored in the memory 51, and are performed by the processor 50, to complete the present invention.Described one
Individual or multiple module/units can be the series of computation machine programmed instruction section that can complete specific function, and the instruction segment is used for
The computer program 52 is described in the offset printing to the implementation procedure in print detection terminal equipment 5.For example, the computer journey
Sequence 52 can be divided into image collection module, the first pattern extraction module, the second pattern extraction module, flip module, edge
Extraction module, the first computing module, the first determination module and the second determination module.
The offset printing can be that cash inspecting machine, deposit machine, cash dispenser and cash recycling system etc. are whole to print detection terminal equipment 5
End equipment.The offset printing may include to print detection terminal equipment, but be not limited only to, processor 50, memory 51.Art technology
Personnel are appreciated that Fig. 5 is only example of the offset printing to print detection terminal equipment 5, do not form to offset printing to printing detection terminal
The restriction of equipment 5, it can include than illustrating more or less parts, either combine some parts or different parts, example
Such as described offset printing can also include input-output equipment, network access equipment, bus to print detection terminal equipment 5.
The processor 50 can be CPU (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit
(Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-
Programmable Gate Array, FPGA) either other PLDs, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor can also be any conventional processor
Deng.
The memory 51 can be the offset printing to printing the internal storage unit of detection terminal equipment 5, such as offset printing pair
Print the hard disk or internal memory of detection terminal equipment 5.The memory 51 can also be the offset printing to the outer of print detection terminal equipment 5
Portion's storage device, such as the offset printing is to the plug-in type hard disk being equipped with print detection terminal equipment 5, intelligent memory card (Smart
Media Card, SMC), secure digital (Secure Digital, SD) card, flash card (Flash Card) etc..Further,
The memory 51 can also both include the offset printing to printing the internal storage unit of detection terminal equipment 5 or including external storage
Equipment.The memory 51 be used for store the computer program and the offset printing to print detection terminal equipment 5 needed for its
Its program and data.The memory 51 can be also used for temporarily storing the data that has exported or will export.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each work(
Can unit, module division progress for example, in practical application, can be as needed and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device are divided into different functional units or module, more than completion
The all or part of function of description.Each functional unit, module in embodiment can be integrated in a processing unit, also may be used
To be that unit is individually physically present, can also two or more units it is integrated in a unit, it is above-mentioned integrated
Unit can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.In addition, each function list
Member, the specific name of module are not limited to the protection domain of the application also only to facilitate mutually distinguish.Said system
The specific work process of middle unit, module, the corresponding process in preceding method embodiment is may be referred to, will not be repeated here.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and is not described in detail or remembers in some embodiment
The part of load, it may refer to the associated description of other embodiments.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein
Member and algorithm steps, it can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
Performed with hardware or software mode, application-specific and design constraint depending on technical scheme.Professional and technical personnel
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed device/terminal device and method, can be with
Realize by another way.For example, device described above/terminal device embodiment is only schematical, for example, institute
The division of module or unit is stated, only a kind of division of logic function, there can be other dividing mode when actually realizing, such as
Multiple units or component can combine or be desirably integrated into another system, or some features can be ignored, or not perform.Separately
A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be by some interfaces, device
Or INDIRECT COUPLING or the communication connection of unit, can be electrical, mechanical or other forms.
The unit illustrated as separating component can be or may not be physically separate, show as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.
If the integrated module/unit realized in the form of SFU software functional unit and as independent production marketing or
In use, it can be stored in a computer read/write memory medium.Based on such understanding, the present invention realizes above-mentioned implementation
All or part of flow in example method, by computer program the hardware of correlation can also be instructed to complete, described meter
Calculation machine program can be stored in a computer-readable recording medium, and the computer program can be achieved when being executed by processor
The step of stating each embodiment of the method.Wherein, the computer program includes computer program code, the computer program generation
Code can be source code form, object identification code form, executable file or some intermediate forms etc..The computer-readable medium
It can include：Any entity or device, recording medium, USB flash disk, mobile hard disk, the magnetic of the computer program code can be carried
Dish, CD, computer storage, read-only storage (ROM, Read-Only Memory), random access memory (RAM,
Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It is it should be noted that described
The content that computer-readable medium includes can carry out appropriate increasing according to legislation in jurisdiction and the requirement of patent practice
Subtract, such as in some jurisdictions, electric carrier signal and electricity are not included according to legislation and patent practice, computer-readable medium
Believe signal.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to foregoing reality
Example is applied the present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each
Technical scheme described in embodiment is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed
Or replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme, all should
Within protection scope of the present invention.
Claims (10)
1. a kind of offset printing is to printing detection method, it is characterised in that including：
The head-on reflection image and backside reflection image of target bank note are obtained respectively；
The first offset printing in the head-on reflection image is extracted to being patterned；
The second offset printing in the backside reflection image is extracted to being patterned；
To first offset printing to being patterned with second offset printing to one of carry out flip horizontal in being patterned, obtain
To being patterned, another holding is constant, is designated as the 4th offset printing to being patterned for 3rd offset printing；
The 3rd offset printing is extracted respectively to the first edge contour pixel group that is patterned and the 4th offset printing to being patterned
Second edge contour pixel group；
Calculate the number of the coincident pixel point of the first edge contour pixel group and the second edge contour pixel group；
If the number of the coincident pixel point is fallen into default number range, judge the offset printing of the target bank note to printing just
Often；
If the number of the coincident pixel point exceeds the number range, judge that the offset printing of the target bank note is abnormal to print.
2. offset printing according to claim 1 is to printing detection method, it is characterised in that described to extract the head-on reflection figure
As in the first offset printing to be patterned including：
First offset printing is estimated to the target area that is patterned in the head-on reflection image according to predeterminated position, it is described pre-
If position is first offset printing to the position that is patterned in standard bank note corresponding with the target bank note；
Binary conversion treatment is carried out to the image in the target area, obtains target area bianry image；
According to the pixel grey scale Distribution and localization of the target area bianry image go out first offset printing to be patterned it is described just
First position in the reflected image of face；
First offset printing is extracted to being patterned according to the first position.
3. offset printing according to claim 2 is to printing detection method, it is characterised in that according to predeterminated position estimation described the
One offset printing to before being patterned the target area in the head-on reflection image, in addition to：
Binary conversion treatment is carried out to the head-on reflection image of the target bank note, obtains target bank note bianry image；
The corresponding pixel points of the target bank note bianry image and each default standard bank note bianry image are carried out with or transported
Calculate and sum, obtain each matched pixel points, the standard bank note bianry image is the head-on reflection image to standard bank note
Carry out the image obtained by binary conversion treatment；
Determine the maximum in each matched pixel points；
If the maximum is more than default threshold value, standard bank note corresponding to the maximum is defined as and the target basis
Standard bank note corresponding to coin.
4. offset printing according to claim 2 is to printing detection method, it is characterised in that described to extract the reflected rear view
As in the second offset printing to be patterned including：
It is determined that the first offset printing described in the standard bank note to the position that is patterned and second offset printing to the position that is patterned
Functional relation between putting；
Second offset printing is oriented to being patterned in the reflected rear view according to the functional relation and the first position
The second place as in；
Second offset printing is extracted to being patterned according to the second place.
5. offset printing according to any one of claim 1 to 4 is to printing detection method, it is characterised in that described to extract respectively
3rd offset printing is to the first edge contour pixel group that is patterned and the 4th offset printing to the second edge profile that is patterned
Pixel groups include：
Using medium filtering respectively to the 3rd offset printing to being patterned with the 4th offset printing to being patterned carry out denoising,
Obtain the 3rd offset printing after denoising to be patterned and denoising after the 4th offset printing to being patterned；
Using high-pass filtering respectively to the 3rd offset printing after denoising to be patterned and denoising after the 4th offset printing to print
Pattern is sharpened processing, and the 3rd offset printing after being sharpened is to the 4th offset printing after being patterned and sharpening to being patterned；
Respectively to the 3rd offset printing after sharpening to the 4th offset printing after being patterned and sharpening to being patterned carry out edge
Connection is handled, and the 3rd offset printing after being connected is to the 4th offset printing after being patterned and connecting to being patterned；
Most closed contours is counted out as described first to being patterned middle selected pixels from the 3rd offset printing after connection
Edge contour pixel groups；
Most closed contours is counted out as described second to being patterned middle selected pixels from the 4th offset printing after connection
Edge contour pixel groups.
6. a kind of offset printing is to printing detection means, it is characterised in that including：
Image collection module, for obtaining the head-on reflection image and backside reflection image of target bank note respectively；
First pattern extraction module, for extracting the first offset printing in the head-on reflection image to being patterned；
Second pattern extraction module, for extracting the second offset printing in the backside reflection image to being patterned；
Flip module, for first offset printing to being patterned with second offset printing to one of progress in being patterned
Flip horizontal, the 3rd offset printing is obtained to being patterned, another holding is constant, is designated as the 4th offset printing to being patterned；
Edge extracting module, for extracting the 3rd offset printing respectively to the first edge contour pixel group being patterned and described
Four offset printings are to the second edge contour pixel group that is patterned；
First computing module, for calculating the coincidence of the first edge contour pixel group and the second edge contour pixel group
The number of pixel；
First determination module, if the number for the coincident pixel point is fallen into default number range, judge the mesh
The offset printing of millimeter paper coin is normal to printing；
Second determination module, if the number for the coincident pixel point exceeds the number range, judge the target basis
The offset printing of coin is abnormal to print.
7. offset printing according to claim 6 is to printing detection means, it is characterised in that the first pattern extraction module bag
Include：
Target area estimation unit, for estimating first offset printing to being patterned in the head-on reflection figure according to predeterminated position
Target area as in, the predeterminated position are first offset printing to being patterned in standard paper corresponding with the target bank note
Position in coin；
Target area binarization unit, for carrying out binary conversion treatment to the image in the target area, obtain target area
Bianry image；
First position positioning unit, for going out described first according to the pixel grey scale Distribution and localization of the target area bianry image
Offset printing is to the first position that is patterned in the head-on reflection image；
First pattern extraction unit, for extracting first offset printing to being patterned according to the first position.
8. the offset printing according to any one of claim 6 to 7 is to printing detection means, it is characterised in that the edge extracting
Module includes：
Median filter unit, for using medium filtering respectively to the 3rd offset printing to be patterned with the 4th offset printing to print
Pattern carry out denoising, obtain the 3rd offset printing after denoising to be patterned and denoising after the 4th offset printing to being patterned；
High pass filter unit, for using high-pass filtering respectively to the 3rd offset printing after denoising to be patterned and denoising after
4th offset printing is sharpened processing to being patterned, and the 3rd offset printing after being sharpened is to the 4th glue after being patterned and sharpening
Print is to being patterned；
Edge connection unit, for respectively to the 3rd offset printing after sharpening to the 4th offset printing after being patterned and sharpening
Edge connection processing is carried out to being patterned, the 3rd offset printing after being connected is to the 4th offset printing after being patterned and connecting to impression
Case；
First edge choose unit, for from the 3rd offset printing after connection to be patterned middle selected pixels count out it is most
Closed contour is as the first edge contour pixel group；
Second edge choose unit, for from the 4th offset printing after connection to be patterned middle selected pixels count out it is most
Closed contour is as the second edge contour pixel group.
9. a kind of offset printing is to printing detection terminal equipment, including memory, processor and it is stored in the memory and can be
The computer program run on the processor, it is characterised in that realized such as during computer program described in the computing device
The step of offset printing any one of claim 1 to 5 is to print detection method.
10. a kind of computer-readable recording medium, the computer-readable recording medium storage has computer program, and its feature exists
In offset printing of the realization as any one of claim 1 to 5 is to printing detection side when the computer program is executed by processor
The step of method.
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