CN105389883B - A kind of paper money number recognition methods of cash inspecting machine - Google Patents
A kind of paper money number recognition methods of cash inspecting machine Download PDFInfo
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Abstract
The invention discloses a kind of paper money number recognition methods of cash inspecting machine, the cash inspecting machine includes processor, memory, epigraph sensor and hypograph sensor, processor electrically connects with memory, epigraph sensor and hypograph sensor respectively, cash inspecting machine and upper mechatronics；Comprise the following steps：The present invention includes crown word number coarse localization；Extract each pixel point coordinates (f of crown word number regionx, fy), utilize (fx, fy) around 4 pixels carry out bilinear interpolation fitting, obtain the crown word number subgraph A ' of bank note；To crown word number subgraph A ' carry out binaryzations, using the method for 8 neighborhood contours extracts, the characteristic vector F of each object in A ' is extracted；Crown word number identifies and the output present invention has the characteristics of crown word number extraction rate is fast, recognition accuracy is high.
Description
Technical field
The present invention relates to cash inspecting machine technical field, more particularly, to a kind of crown word number extraction rate is fast, recognition accuracy is high
Cash inspecting machine paper money number recognition methods.
Background technology
Identified for paper money number, either which kind of classifying identification method, extract the stable premise for being characterized in identification.
Crest number is identified usually using neural net method, neural net method has following pros and cons：
Need substantial amounts of sample to be trained, staggered the time when there is character to sentence, network can only be attributed to and do not trained, then weighed
New collection batch sample is trained again；Or network structure is unreasonable, the network number of plies and node number, and excitation letter are adjusted
Number etc..If individual characters sentence mistake, want to change this state and trained again, it is necessary to put into substantial amounts of work, still,
The performance that the network newly trained has had is not ensured that, vicious circle will be caused.
If whole character picture is inputted into neutral net, global feature will be caused to be similar to, and the obvious word of local feature
It is low to accord with discrimination.Such as character 0 and D, 8 and B, S and 5,2 and Z, E and F etc..And profile chain code can reflect the local feature of character,
There is high discrimination to the obvious character of local feature.
The content of the invention
The goal of the invention of the present invention be in order to overcome crown word number identification method crown word number extraction rate of the prior art it is slow,
A kind of low deficiency of recognition accuracy, there is provided the paper money for the cash inspecting machine that crown word number extraction rate is fast, recognition accuracy is high
Number recognition methods.
To achieve these goals, the present invention uses following technical scheme：
A kind of paper money number recognition methods of cash inspecting machine, the cash inspecting machine include processor, memory, epigraph sensing
Device, hypograph sensor, display and alarm；Processor respectively with memory, epigraph sensor, hypograph sensor,
Display and alarm electrical connection；Comprise the following steps：
(1-1) when bank note passes through cash inspecting machine, epigraph sensor and hypograph sensor respectively with bank note upper and lower surface
Image is simultaneously transmitted to processor by contact, epigraph sensor and hypograph sensor collection image；
Processor identifies the angle anghori of bank note coboundary fitting a straight line and the X-axis of setting, the fitting of bank note left margin
Straight line and the angle angvert, the coordinate (O of bank note top left corner pixel point of the Y-axis of settingx, Oy)；Column direction is provided with processor
Zoom factor coefcol and line direction zoom factor coefrow；
Region where (1-2) processor coarse localization crown word number, set (nx, ny) it is crown word number area after rotation correction
The coordinate of any one pixel in the A of domain；
Utilize formulaCrown word number region A each pixel is calculated, in rotation school
Pixel point coordinates (f in just preceding original imagex, fy),
Wherein,
Processor extracts each pixel point coordinates (f of crown word number region in image is gatheredx, fy), utilize (fx,
fy) around 4 pixels carry out bilinear interpolation fitting, so as to obtain the crown word number subgraph A ' of bank note；
(1-3) processor uses Otsu dynamic thresholds to crown word number subgraph A ' carry out binaryzations, using 8 neighborhood contours extracts
Method, extract A ' in each object characteristic vector F；
Be provided with Sample Storehouse in (1-4) memory, recognition threshold Q, be provided with Sample Storehouse respectively with each prefix sign character phase
Corresponding characteristic vector template, processor are searched for and obtain the characteristic vector minimum with the characteristic vector F of each object distances
Template Tmin；
(1-5) processor utilizes formulaSimilarity ρ is calculated,
As ρ >=Q, then processor will be with TminCorresponding character is selected and preserved in memory,
As ρ ＜ Q, then processor will "" preserve in memory；
When all character recognition are completed, processor is external according to the outline of the object corresponding with each character
The order of the centre coordinate of rectangle from small to large, each character is arrayed from left to right the paper money for being identified out
Number A1；
Processor control display show A1 and A ', when in A1 any one character for "" when, processor control alarm
Alarm.
The present invention includes crown word number coarse localization；Extract each pixel point coordinates (f of crown word number regionx, fy), profit
With (fx, fy) around 4 pixels carry out bilinear interpolation fitting, obtain the crown word number subgraph A ' of bank note；To crown word number subgraph
A ' carry out binaryzations, using the method for 8 neighborhood contours extracts, extract the characteristic vector F of each object in A '；Crown word number is known
Not and export.
The present invention scans for the outline of object according to the clockwise direction of 8 neighborhoods, and Internal periphery is according to 8 neighborhoods
Counterclockwise scan for, due to having 8 possible directions to next profile point for each point of profile, chain code
Tendency simulates the tendency of character stroke well, accurate can represent each character, while extracting chain code, also obtains
2 dimension profile coordinate points of object, beneficial to the discrimination of identification later stage similar character details, profile chain code is linear character, phase
For some existing region features, faster, the present invention only needs run-down image to feature of present invention extraction rate, you can to pick
Except the stain at most of crown word number, the accuracy rate that paper money number identifies largely is improved.
Therefore, the present invention has the characteristics of crown word number extraction rate is fast, recognition accuracy is high.
Preferably, the method using 8 neighborhood contours extracts, the characteristic vector F of each object in A ' is extracted
Comprise the following specific steps that：
Object number n is provided with memory, sets search sequence number i initial value as 1；
To the crown word number subgraph of binaryzation according to from top to bottom, order from left to right progressively scans (2-1) processor, when
When running into first pixel B that pixel value is 255, current pixel point is set to；
Processor does 8 rays by current pixel point, and right, lower right, lower section, lower-left are pointed to from current pixel point
Side, left, upper left side, top, upper right side 8 rays respectively with mutually different integer chain code L1, L2, L3, L4, L5, L6,
L7, L8 are corresponding,
(2-2) processor according to from current pixel point to the right, upper right side, top, upper left side, left, lower left, under
Side, the order of lower right move a pixel successively, and when searching the pixel C that pixel value is 255, this pixel C is made
For current pixel point, when C coordinate and identical B coordinate, step (2-3) is transferred to；
When C coordinate ≠ B coordinate, return to step (2-2)；
(2-3) during search, the coordinate of each pixel searched and chain code are stored and deposited by processor
In reservoir, after search terminates, processor obtains the outline being made up of each pixel, and processor calculates the external square of outline
Shape, center point coordinate, the length and width of object are calculated according to boundary rectangle；
(2-4) processor calculates the Internal periphery number in boundary rectangle, and for each Internal periphery, processor selectes Internal periphery
In any one pixel be current pixel point, repeat step (2-2) to (2-3), according to from current pixel point to the right, it is right
Lower section, lower section, lower left, left, upper left side, top, the order in upper right side move a pixel successively, after search terminates, place
Manage device and calculate the inscribed rectangle of each Internal periphery, and obtain the centre coordinate of each inscribed rectangle；
The chain code of outline and each Internal periphery is combined and forms object chain code length, chain code tendency；
(2-5) makes i values increase by 1, and as i ＜ n, in the A ' outside the object being searched, repeat step (2-1) is extremely
(2-4), continue search for other objects；
Work as i=n, then all object search finish；By the chain code length, chain code tendency, Internal periphery of each object
Number, length, width, Internal periphery inscribed rectangle centre coordinate and outline boundary rectangle centre coordinate combination form it is special
Levy vectorial F.
Preferably, the angle of the adjacent ray is 45 °.
Preferably, the pixel sum that the object is searched for when the chain code length of each object is finished by search
Amount, the chain code tendency are made up of the chain code of the sequencing arrangement according to the pixel searched.
Preferably, the region where the processor coarse localization crown word number comprises the following steps：
When processor makes the face-up judgement of bank note according to the image of collection, processor is adopted in epigraph sensor
Choose crown word number region in the lower left region of the image of collection；
When processor makes the judgement of bank note face down according to the image of collection, processor is in epigraph sensor
The right regions of the image of collection choose crown word number region；
When processor makes the judgement of bank note reverse side upward according to the image of collection, processor is adopted in hypograph sensor
The lower right area of the image of collection chooses crown word number region；
When processor makes the judgement directed downwardly of bank note reverse side according to the image of collection, processor is adopted in hypograph sensor
The top left region of the image of collection chooses crown word number region.
Preferably, described L1, L2, L3, L4, L5, L6, L7, L8 are respectively 1,2,3,4,5,6,7,0.
Preferably, Q is 88% to 93%.
Therefore, the present invention has the advantages that：Crown word number extraction rate is fast and recognition accuracy is high.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the 8 neighborhood contour extraction methods of the present invention；
Fig. 2 is a kind of crown word number subgraph to be identified of the present invention；
Fig. 3 is a kind of chain code schematic diagram of the character 0 of the present invention；
Fig. 4 is a kind of chain code schematic diagram of the character 1 of the present invention；
Fig. 5 is a kind of flow chart of embodiments of the invention.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
Embodiment as shown in Figure 1 is a kind of paper money number recognition methods of cash inspecting machine, and cash inspecting machine includes processor, deposited
Reservoir, epigraph sensor, hypograph sensor, display and alarm；Processor senses with memory, epigraph respectively
Device, hypograph sensor, display and alarm electrical connection；Comprise the following steps：
As shown in figure 5,
Step 100, image is gathered
When bank note passes through cash inspecting machine, epigraph sensor and hypograph sensor contact with bank note upper and lower surface respectively,
Image is simultaneously transmitted to processor by epigraph sensor and hypograph sensor collection image；
Processor identifies the angle anghori of bank note coboundary fitting a straight line and the X-axis of setting, the fitting of bank note left margin
Straight line and the angle angvert, the coordinate (O of bank note top left corner pixel point of the Y-axis of settingx, Oy)；Column direction is provided with processor
Zoom factor coefcol and line direction zoom factor coefrow；
Step 200, bilinear interpolation fitting is carried out to each pixel, obtains the crown word number subgraph of bank note
Region where processor coarse localization crown word number, when processor, according to the image of collection to make bank note face-up
Judgement when, crown word number region is chosen in the lower left region of the image that processor gathers in epigraph sensor；
When processor makes the judgement of bank note face down according to the image of collection, processor is in epigraph sensor
The right regions of the image of collection choose crown word number region；
When processor makes the judgement of bank note reverse side upward according to the image of collection, processor is adopted in hypograph sensor
The lower right area of the image of collection chooses crown word number region；
When processor makes the judgement directed downwardly of bank note reverse side according to the image of collection, processor is adopted in hypograph sensor
The top left region of the image of collection chooses crown word number region；
Set (nx, ny) be any one pixel in crown word number region A after rotation correction coordinate；
Utilize formulaCrown word number region A each pixel is calculated, in rotation school
Pixel point coordinates (f in just preceding original imagex, fy),
Wherein,
Processor extracts each pixel point coordinates (f of crown word number region in image is gatheredx, fy), utilize (fx,
fy) around 4 pixels carry out bilinear interpolation fitting, so as to obtain the crown word number subgraph A ' of bank note；
Step 300, processor uses Otsu dynamic thresholds to crown word number subgraph A ' carry out binaryzations, using 8 neighborhood profiles
The method of extraction, extract the characteristic vector F of each object in A '；
Each character in crown word number subgraph A ' as shown in Figure 2 is object, and black is substrate, and white is character.
Object number n=10 is provided with memory, sets search sequence number i initial value as 1；
Step 310, processor to the crown word number subgraph of binaryzation as shown in Figure 2 according to from top to bottom, from left to right
Order progressively scans, and when running into first pixel B that pixel value is 255, is set to current pixel point；In the present embodiment, by
In character R height highests, can be scanned first.
As shown in figure 1, processor does 8 rays by current pixel point, from current pixel point point to right, lower right,
Lower section, lower left, left, upper left side, top, 8 rays in upper right side are corresponding with chain code 1,2,3,4,5,6,7,0 respectively,
Step 320, processor according to from current pixel point to the right, upper right side, top, upper left side, left, lower left,
Lower section, the order of lower right move a pixel successively, when searching the pixel C that pixel value is 255, by this pixel C
As current pixel point, when C coordinate and identical B coordinate, step 330 is transferred to；
When C coordinate ≠ B coordinate, return to step 320；
Step 330, during search, processor stores the coordinate of each pixel searched and chain code
In memory, after search terminates, processor obtains the outline being made up of each pixel, and processor calculates the external of outline
Rectangle, center point coordinate, the length and width of object are calculated according to boundary rectangle；
Step 340, processor calculates the Internal periphery number in boundary rectangle, and for each Internal periphery, processor is selected interior
Any one pixel in profile is current pixel point, repeat step 320 to 330, according to from current pixel point to the right, it is right
Lower section, lower section, lower left, left, upper left side, top, the order in upper right side move a pixel successively, after search terminates, place
Manage device and calculate the inscribed rectangle of each Internal periphery, and obtain the centre coordinate of each inscribed rectangle；
The chain code of outline and each Internal periphery is combined and forms object chain code length, chain code tendency；
Step 350, i values is increased by 1, as i ＜ 10, in the A ' outside the object being searched, repeat step 310 to
340, continue search for other objects；
Work as i=10, then all object search finish；By the chain code length, chain code tendency, Internal periphery of each object
Number, length, width, Internal periphery inscribed rectangle centre coordinate and outline boundary rectangle centre coordinate combination form it is special
Levy vectorial F.
Step 400, each object is identified, display screen shows A1 and A '
It is provided with Sample Storehouse in memory, recognition threshold Q, is provided with Sample Storehouse corresponding with each prefix sign character respectively
Characteristic vector template, processor are searched for and obtain the characteristic vector template minimum with the characteristic vector F of each object distances
Tmin；
Sample Storehouse is that the features described above of each character in batch bank note sample is extracted using the method for the present invention and is obtained
's.
Step 500, processor utilizes formulaSimilarity ρ is calculated,
As ρ >=Q, then processor will be with TminCorresponding character is selected and preserved in memory,
As ρ ＜ Q, then processor will "" preserve in memory；
When all character recognition are completed, processor is external according to the outline of the object corresponding with each character
The order of the centre coordinate of rectangle from small to large, each character is arrayed from left to right the paper money for being identified out
Number A1；
Processor control display show A1 and A ', when in A1 any one character for "" when, processor control alarm
Alarm.The angle of adjacent ray is 45 °.
As shown in Figure 3, Figure 4, abscissa is the chain code length of object, and ordinate is the chain code tendency of object；Chain code
The pixel total quantity that the object is searched for when length is finished by search, chain code tendency is by the elder generation according to the pixel searched
Tactic chain code is formed afterwards.
It is very big that the chain code schematic diagram difference of different objects is can be seen that from Fig. 3, Fig. 4, therefore can be according to chain code
Difference easily distinguishes kinds of characters.
Wherein, the region where processor coarse localization crown word number comprises the following steps：
Q is 90%, and the present invention has been used for a few money currency examination devices, and crown word number recognition accuracy reaches 99.8%.
It should be understood that the present embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that
After having read the content of the invention lectured, those skilled in the art can make various changes or modifications to the present invention, these etc.
Valency form equally falls within the application appended claims limited range.
Claims (5)
1. a kind of paper money number recognition methods of cash inspecting machine, the cash inspecting machine includes processor, memory, epigraph sensing
Device, hypograph sensor, display and alarm；Processor respectively with memory, epigraph sensor, hypograph sensor,
Display and alarm electrical connection；It is characterized in that comprise the following steps：
(1-1) when bank note passes through cash inspecting machine, epigraph sensor and hypograph sensor contact with bank note upper and lower surface respectively,
Image is simultaneously transmitted to processor by epigraph sensor and hypograph sensor collection image；
Processor identifies the angle anghori of bank note coboundary fitting a straight line and the X-axis of setting, bank note left margin fitting a straight line
With the angle angvert of the Y-axis of setting, the coordinate (O of bank note top left corner pixel pointx, Oy)；Column direction is provided with processor to scale
Coefficient coefcol and line direction zoom factor coefrow；
Region where (1-2) processor coarse localization crown word number, set (nx, ny) it is in crown word number region A after rotation correction
Any one pixel coordinate；
Utilize formulaCrown word number region A each pixel is calculated, before rotation correction
Original image in pixel point coordinates (fx, fy),
Wherein,
Processor extracts each pixel point coordinates (f of crown word number region in image is gatheredx, fy), utilize (fx, fy) around
4 pixels carry out bilinear interpolation fitting, so as to obtain the crown word number subgraph A ' of bank note；
(1-3) processor uses Otsu dynamic thresholds to crown word number subgraph A ' carry out binaryzations, using the side of 8 neighborhood contours extracts
Method, extract the characteristic vector F of each object in A '；
Object number n is provided with memory, sets search sequence number i initial value as 1；
(1-3-1) processor, according to from top to bottom, order progressive scan from left to right, works as chance to the crown word number subgraph of binaryzation
During to first pixel B that pixel value is 255, current pixel point is set to；
Processor does 8 rays by current pixel point, and right, lower right, lower section, lower left, a left side are pointed to from current pixel point
Side, upper left side, top, upper right side 8 rays respectively with mutually different integer chain code L1, L2, L3, L4, L5, L6, L7, L8
It is corresponding,
(1-3-2) processor according to from current pixel point to the right, upper right side, top, upper left side, left, lower left, lower section,
The order of lower right successively move a pixel, when search pixel value be 255 pixel C when, using this pixel C as ought
Preceding pixel point, when C coordinate and identical B coordinate, it is transferred to step (1-3-3)；
When C coordinate ≠ B coordinate, return to step (1-3-2)；
(1-3-3) during search, the coordinate of each pixel searched and chain code are stored storage by processor
In device, after search terminates, processor obtains the outline being made up of each pixel, and processor calculates the external square of outline
Shape, center point coordinate, the length and width of object are calculated according to boundary rectangle；
(1-3-4) processor calculates the Internal periphery number in boundary rectangle, and for each Internal periphery, processor is selected in Internal periphery
Any one pixel be current pixel point, repeat step (1-3-2) to (1-3-3), according to from current pixel point to the right,
Lower right, lower section, lower left, left, upper left side, top, the order in upper right side move a pixel successively, after search terminates,
Processor calculates the inscribed rectangle of each Internal periphery, and obtains the centre coordinate of each inscribed rectangle；
The chain code of outline and each Internal periphery is combined and forms object chain code length, chain code tendency；
(1-3-5) makes i values increase by 1, and as i ＜ n, in the A ' outside the object being searched, repeat step (1-3-1) is extremely
(1-3-4), continue search for other objects；
Work as i=n, then all object search finish；By the chain code length of each object, chain code tendency, Internal periphery number, length
Degree, width, Internal periphery inscribed rectangle centre coordinate and outline boundary rectangle centre coordinate combine constitutive characteristic to
Measure F；
It is provided with Sample Storehouse in (1-4) memory, recognition threshold Q, is provided with Sample Storehouse corresponding with each prefix sign character respectively
Characteristic vector template, processor searches for and obtains the characteristic vector template minimum with the characteristic vector F of each object distances
Tmin；
(1-5) processor utilizes formulaSimilarity ρ is calculated,
As ρ >=Q, then processor will be with fminCorresponding character is selected and preserved in memory,
As ρ ＜ Q, then processor will "" preserve in memory；
When all character recognition are completed, processor according to the outline of the object corresponding with each character boundary rectangle
Centre coordinate order from small to large, each character is arrayed from left to right the paper money number for being identified out
A1；
Processor control display show A1 and A ', when in A1 any one character for "" when, processor control alarm report
It is alert.
2. the paper money number recognition methods of cash inspecting machine according to claim 1, it is characterized in that, the chain code of each object
The pixel total quantity that the object is searched for when length is finished by search, the chain code tendency is by according to the pixel searched
Sequencing arrangement chain code form.
3. the paper money number recognition methods of cash inspecting machine according to claim 1, it is characterized in that, the processor is fixed roughly
Region where the crown word number of position comprises the following steps：
When processor makes the face-up judgement of bank note according to the image of collection, processor gathers in epigraph sensor
Choose crown word number region in the lower left region of image；
When processor makes the judgement of bank note face down according to the image of collection, processor gathers in epigraph sensor
The right regions of image choose crown word number region；
When processor makes the judgement of bank note reverse side upward according to the image of collection, processor gathers in hypograph sensor
The lower right area of image chooses crown word number region；
When processor makes the judgement directed downwardly of bank note reverse side according to the image of collection, processor gathers in hypograph sensor
The top left region of image chooses crown word number region.
4. the paper money number recognition methods of cash inspecting machine according to claim 2, it is characterized in that, the L1, L2, L3, L4,
L5, L6, L7, L8 are respectively 1,2,3,4,5,6,7,0.
5. the paper money number recognition methods of the cash inspecting machine according to claim 1 or 2 or 3 or 4, it is characterized in that, Q 88%
To 93%.
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| CN106503694B (en) * | 2016-12-01 | 2018-01-30 | 重庆大学 | Digit recognition method based on eight neighborhood feature |
| CN107240185B (en) * | 2017-06-23 | 2019-09-20 | 深圳怡化电脑股份有限公司 | A kind of crown word number identification method, device, equipment and storage medium |
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