CN106898084A - A kind of method and device for determining image procossing threshold value - Google Patents
A kind of method and device for determining image procossing threshold value Download PDFInfo
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- CN106898084A CN106898084A CN201710169253.5A CN201710169253A CN106898084A CN 106898084 A CN106898084 A CN 106898084A CN 201710169253 A CN201710169253 A CN 201710169253A CN 106898084 A CN106898084 A CN 106898084A
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
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- Engineering & Computer Science (AREA)
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- Inspection Of Paper Currency And Valuable Securities (AREA)
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Abstract
The embodiment of the invention discloses a kind of method and device for determining image procossing threshold value, the method includes：Gather banknote image and determine the up-and-down boundary of bank note in the banknote image；The border of up-and-down boundary and the banknote image according to the bank note determines the target background region of the banknote image；Image procossing threshold value is determined according to the average value of the image pixel value of special ratios scope in the target background region and threshold value setting rule.Based on the above method and device, by gathering background area image and calculating the average value of the pixel value of image in the range of the region special ratios, compare with rule is set according to threshold value, rationally calling for image procossing threshold value can be realized, ensure that sensor calls image procossing threshold value according to different working environments, dramatically reduce the luminance difference for gathering image.
Description
Technical field
The present embodiments relate to technical field of image processing, more particularly to a kind of method for determining image procossing threshold value and
Device.
Background technology
At present, during bank finance traction equipment carries out false distinguishing detection to bank note, imageing sensor be used to adopt
Collect the view data of bank note, but sensor works in different environments, acquired image luminance difference is larger.Specifically
, either temperature rises caused by the change of environment temperature or working sensor heating, to the image data acquiring of bank note
All there is considerable influence.Such as, the overall brightness of the banknote image data that sensor is gathered in high temperature environments can be than normal
The overall brightness of the banknote image data gathered under warm environment is strong, therefore, need to consider to pass during to the image real time transfer of bank note
The processing mode difference that the working environment difference of sensor is brought, and how bank note is adjusted according to the working environment difference of sensor
The processing mode of view data is technical problem urgently to be resolved hurrily.
The content of the invention
The embodiment of the present invention provides a kind of method and device for determining image procossing threshold value, to realize that sensor is based on work
Dynamic adjustment of the environment to image procossing threshold value.
In a first aspect, the embodiment of the present invention provides a kind of method for determining image procossing threshold value, including：
Gather banknote image and determine the up-and-down boundary of bank note in the banknote image；
The border of up-and-down boundary and the banknote image according to the bank note determines the target background of the banknote image
Region；
Rule is set according to the average value of the image pixel value of special ratios scope in the target background region and threshold value
Determine image procossing threshold value.
Further, it is described true according to the up-and-down boundary of the bank note and the border of the banknote image in the above method
The target background region of the fixed banknote image, including：
Coboundary, the coboundary of the banknote image according to the bank note determine the first background area of the banknote image
Domain；
The first background area and first threshold according to the banknote image determine the first start bit in target background region
Put；
The first background area and Second Threshold according to the banknote image determine first stop bits in target background region
Put；
The first object background that the banknote image is determined with first end position is put according to the first start bit
Region.
Further, it is described true according to the up-and-down boundary of the bank note and the border of the banknote image in the above method
The target background region of the fixed banknote image, including：
Lower boundary, the lower boundary of the banknote image according to the bank note determine the second background area of the banknote image
Domain；
The second background area and the 3rd threshold value according to the banknote image determine second start bit in target background region
Put；
The second background area and the 4th threshold value according to the banknote image determine second stop bits in target background region
Put；
The second target background of the banknote image is determined according to second original position and second end position
Region.
Further, in the above method, the image according to specific value proportion in the target background region
The average value of pixel value determines image procossing threshold value with threshold value setting rule, including：
Count the image pixel value histogram in the target background region；
The pixel value of special ratios scope in described image pixel value histogram is chosen, and calculates its average value；
Rule is set based on threshold value, corresponding image procossing threshold value is matched according to the average value.
Further, in the above method, the special ratios scope is 0.7~0.9.
Second aspect, the embodiment of the present invention also provides a kind of device for determining image procossing threshold value, including：
Up-and-down boundary determining module, for gathering banknote image and determining the up-and-down boundary of bank note in the banknote image；
Target area determining module, the border for the up-and-down boundary according to the bank note and the banknote image determines institute
State the target background region of banknote image；
Threshold determination module, for according in the target background region image pixel value of special ratios scope it is average
Value determines image procossing threshold value with threshold value setting rule.
Further, in said apparatus, the target area determining module includes：
First area determining unit, the coboundary for the coboundary according to the bank note, the banknote image determines institute
State the first background area of banknote image；
First start bit puts determining unit, for being determined according to the first background area of the banknote image and first threshold
The first start bit in target background region is put；
First end position determining unit, for being determined according to the first background area of the banknote image and Second Threshold
First end position in target background region；
First object area determination unit, institute is determined for being put according to the first start bit with first end position
State the first object background area of banknote image.
Further, in said apparatus, the target area determining module includes：
Second area determining unit, the lower boundary for the lower boundary according to the bank note, the banknote image determines institute
State the second background area of banknote image；
Second original position determining unit, determines for the second background area according to the banknote image and the 3rd threshold value
Second original position in target background region；
Second end position determining unit, determines for the second background area according to the banknote image and the 4th threshold value
Second end position in target background region；
Second target area determining unit, for determining institute according to second original position and second end position
State the second target background region of banknote image.
Further, in said apparatus, the threshold determination module includes：
Pixel value statistic unit, for counting the image pixel value histogram in the target background region；
Average calculation unit, the pixel value for choosing special ratios scope in described image pixel value histogram, and
Calculate its average value；
Threshold value determination unit, for setting rule based on threshold value, corresponding image procossing threshold is matched according to the average value
Value.
Further, in said apparatus, the special ratios scope is 0.7~0.9.
The method and device of a kind of determination image procossing threshold value that the embodiment of the present invention is provided, by gathering background area
Image simultaneously calculates the average value of the pixel value of image in the range of the region special ratios, compares with rule is set according to threshold value, can
To realize rationally calling for image procossing threshold value, ensure that sensor calls image procossing threshold according to different working environments
Value, dramatically reduces the luminance difference for gathering image.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of schematic flow sheet of the method for determination image procossing threshold value that the embodiment of the present invention one is provided；
Fig. 2 is a kind of structural representation of the method for determination image procossing threshold value that the embodiment of the present invention two is provided.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, in order to just
Part rather than entire infrastructure related to the present invention is illustrate only in description, accompanying drawing.
Embodiment one
Accompanying drawing 1 is referred to, is a kind of schematic flow sheet of the method for determination image procossing threshold value of the embodiment of the present invention one,
The method using image pixel value and the related algorithm of threshold value suitable for such as being processed bank note, and sensor be used to adopt
Collection banknote image data, and it needs to be determined that the scene of image procossing threshold value, the method is come by the device of determination image procossing threshold value
Perform, the device can be realized by software and/or hardware, can be integrated in inside image processor or financial transaction apparatus.The party
Method specifically includes following steps：
S110, gather banknote image and determine the up-and-down boundary of bank note in the banknote image.
It should be noted that the banknote image gathered by sensor in the present embodiment S110 determines the upper of bank note in image
The method of lower boundary, it is preferred that it by obtaining brightness in often the going of image is higher than the point of luminance threshold that pre-sets that can be
Number (it is exemplary, luminance threshold can for 40), and in the between-line spacing for pre-setting obtains next line brightness higher than advance
The points (exemplary, the between-line spacing for pre-setting can be 100 rows) of the luminance threshold of setting；Obtained further according to adjacent rows
Points determine bank note coboundary and lower boundary；Then respectively according to the information of the corresponding adjacent rows of up-and-down boundary, shorten
The between-line spacing for pre-setting, further obtains the position of coboundary and the position of lower boundary in the adjacent rows, so that real
Now fast and effectively orient the border of bank note and background.
The border of S120, the up-and-down boundary according to the bank note and the banknote image determines the target of the banknote image
Background area.
It should be noted that because sensor is when banknote image is gathered, it is difficult to there is position error with avoiding, therefore
The region part of centre is chosen in the background area of the up-and-down boundary of bank note and the borders of banknote image, can be with rejection image
The abnormal influence of edge brightness and the influence of feature modeling error, and the selection of middle region part can be by rule of thumb setting
The mode of fixed fixed segmentation threshold is realized.Exemplary, if the banknote image of collection is high by 100, bank note is located at picture centre,
I.e. lower boundary is high by 25, and coboundary is high by 75, then target background region can be the middle region part between 0~25 and 75~100,
Can be for example 5~20 and 80~95, eliminate the abnormal area part of bank note up-and-down boundary and banknote image up-and-down boundary.
Preferably, it is described that the banknote image is determined according to the up-and-down boundary of the bank note and the border of the banknote image
Target background region, first aspect includes：Described in the coboundary of coboundary, the banknote image according to the bank note determines
First background area of banknote image；The first background area and first threshold according to the banknote image determine target background area
The first start bit in domain is put；The first background area and Second Threshold according to the banknote image determine the of target background region
One end position；Put according to the first start bit and determine that the first object of the banknote image is carried on the back with first end position
Scene area.
Second aspect also includes：Lower boundary, the lower boundary of the banknote image according to the bank note determine the bank note
Second background area of image；The second background area and the 3rd threshold value according to the banknote image determine target background region
Second original position；The second background area and the 4th threshold value according to the banknote image determine second knot in target background region
Beam position；The second target background area of the banknote image is determined according to second original position and second end position
Domain.
It should be noted that the first threshold, Second Threshold, the 3rd threshold value and the 4th threshold value in the above can bases
It is actually needed and is configured, exemplary, when the banknote image of collection is high by 100, it is high that bank note is located at picture centre, i.e. lower boundary
25, coboundary it is high 75 when, first threshold can for 80, Second Threshold can be 95, then the first object background area is 80
~95；3rd threshold value can be 5, and the 4th threshold value can be 20, then the 3rd target background region is 5~20.
Based on first object background area and the second target background region that above-mentioned first aspect and second aspect determine, institute
The target background region for stating banknote image can be the first object background area, or the second target background area
Domain, can also be the combination in the first object background area and the second target background region, depending on actual conditions.
S130, set according to the average value of the image pixel value of special ratios scope in the target background region and threshold value
Rule determines image procossing threshold value.
Specifically, counting the image pixel value histogram in the target background region；Choose described image pixel value straight
The pixel value of special ratios scope in square figure, and calculate its average value；Rule is set based on threshold value, is matched according to the average value
Corresponding image procossing threshold value.
Preferably, the special ratios may range from 0.7~0.9.The foundation for so determining is to only focus on sensor
The brighter part that residing working environment change causes, and eliminate the influence of most bright foreign matter (on such as sensor
The white line that dust is caused in IMAQ)
A more step is exemplary specifically, count the number of all image pixel values in the target background region, than
If the number that statistical picture pixel value is 50 is for 5, image pixel value is that 60 number is 6, and is represented in histogrammic form
Each image pixel value is in overall accounting in the target background region.Exemplary, if wherein image pixel value is 50
Number to 60 just falls in the special ratios scope 0.7-0.9, then statistical picture pixel value is 50 to 60 pixel value
Average value, final image procossing threshold value is determined rule is set by threshold value.
It should be noted that because sensor works in different environments, the larger (ratio of acquired image luminance difference
Such as the difference of environment temperature, high temperature hypograph can integrally brighten compared with normal temperature hypograph), therefore needed in the image procossing to bank note
Consider the processing mode difference that working environment difference is brought, such as its threshold value just needs to adjust with some algorithms of pixel value correlation
It is whole (such as new and old allocation algorithm, is stained algorithm, defect detection algorithm etc., in new and old grade, identical grade, under high temperature its
Judge that interval is higher than normal temperature；New and old sorting under high temperature needs to be given based on the statistical value under high temperature, no longer using under normal temperature
Value).
The threshold value setting rule can be by obtaining under different operating environment, the banknote image that sensor correspondence is collected
Brightness, the corresponding relation further according to the image procossing threshold value after operating ambient temperature, brightness of image and actual adjustment sets up threshold value
Setting rule, and store to realize that sensor is based on dynamic adjustment of the working environment to image procossing threshold value.
Explanation is needed further exist for, in the embodiment of the present invention, the determination link of image procossing threshold value is present in bank note figure
In as the whole flow process for the treatment of, so as to the temperature change of real-time control working sensor environment.
In sum, the technical scheme that the embodiment of the present invention is provided, by gathering background area image and calculating the area
The average value of the pixel value of image in the range of the special ratios of domain, compares, it is possible to achieve image procossing with rule is set according to threshold value
Rationally calling for threshold value, ensure that sensor calls image procossing threshold value according to different working environments, dramatically drop
The luminance difference of low gathered image.
Embodiment two
Accompanying drawing 2 is referred to, is that a kind of structure of the device of determination image procossing threshold value that the embodiment of the present invention two is provided is shown
It is intended to, the device is specifically comprising such as lower module：
Up-and-down boundary determining module 21, for gathering banknote image and determining the upper following of bank note in the banknote image
Boundary；
Target area determining module 22, the border for the up-and-down boundary according to the bank note and the banknote image determines
The target background region of the banknote image；
Threshold determination module 23, for according in the target background region image pixel value of special ratios scope it is flat
Average determines image procossing threshold value with threshold value setting rule.
Preferably, the target area determining module includes：
First area determining unit, the coboundary for the coboundary according to the bank note, the banknote image determines institute
State the first background area of banknote image；
First start bit puts determining unit, for being determined according to the first background area of the banknote image and first threshold
The first start bit in target background region is put；
First end position determining unit, for being determined according to the first background area of the banknote image and Second Threshold
First end position in target background region；
First object area determination unit, institute is determined for being put according to the first start bit with first end position
State the first object background area of banknote image.
Preferably, the target area determining module includes：
Second area determining unit, the lower boundary for the lower boundary according to the bank note, the banknote image determines institute
State the second background area of banknote image；
Second original position determining unit, determines for the second background area according to the banknote image and the 3rd threshold value
Second original position in target background region；
Second end position determining unit, determines for the second background area according to the banknote image and the 4th threshold value
Second end position in target background region；
Second target area determining unit, for determining institute according to second original position and second end position
State the second target background region of banknote image.
Preferably, the threshold determination module includes：
Pixel value statistic unit, for counting the image pixel value histogram in the target background region；
Average calculation unit, the pixel value for choosing special ratios scope in described image pixel value histogram, and
Calculate its average value；
Threshold value determination unit, for setting rule based on threshold value, corresponding image procossing threshold is matched according to the average value
Value.
Preferably, the special ratios scope is 0.7~0.9.
The embodiment of the present invention is by gathering banknote image and determining the up-and-down boundary of bank note in the banknote image；According to institute
The border of the up-and-down boundary and the banknote image of stating bank note determines the target background region of the banknote image；According to the mesh
The average value of the image pixel value of special ratios scope determines image procossing threshold value with threshold value setting rule in mark background area.Base
In the above method and device, by gathering background area image and calculating the pixel value of image in the range of the region special ratios
Average value, compares with rule is set according to threshold value, it is possible to achieve rationally calling for image procossing threshold value, ensure that sensor root
Image procossing threshold value is called according to different working environments, the luminance difference for gathering image is dramatically reduced.
Said apparatus can perform the method that any embodiment of the present invention is provided, and possess the corresponding functional module of execution method
And beneficial effect.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. it is a kind of determine image procossing threshold value method, it is characterised in that including：
Gather banknote image and determine the up-and-down boundary of bank note in the banknote image；
The border of up-and-down boundary and the banknote image according to the bank note determines the target background region of the banknote image；
Determined according to the average value of the image pixel value of special ratios scope in the target background region and threshold value setting rule
Image procossing threshold value.
2. method according to claim 1, it is characterised in that the up-and-down boundary and the bank note according to the bank note
The border of image determines the target background region of the banknote image, including：
Coboundary, the coboundary of the banknote image according to the bank note determine the first background area of the banknote image；
The first background area and first threshold according to the banknote image determine that the first start bit in target background region is put；
The first background area and Second Threshold according to the banknote image determine first end position in target background region；
The first object background area that the banknote image is determined with first end position is put according to the first start bit.
3. method according to claim 1, it is characterised in that the up-and-down boundary and the bank note according to the bank note
The border of image determines the target background region of the banknote image, including：
Lower boundary, the lower boundary of the banknote image according to the bank note determine the second background area of the banknote image；
The second background area and the 3rd threshold value according to the banknote image determine second original position in target background region；
The second background area and the 4th threshold value according to the banknote image determine second end position in target background region；
The second target background region of the banknote image is determined according to second original position and second end position.
4. method according to claim 1, it is characterised in that described according to specific value ratio in the target background region
The average value of the image pixel value of example scope determines image procossing threshold value with threshold value setting rule, including：
Count the image pixel value histogram in the target background region；
The pixel value of special ratios scope in described image pixel value histogram is chosen, and calculates its average value；
Rule is set based on threshold value, corresponding image procossing threshold value is matched according to the average value.
5. method according to claim 4, it is characterised in that the special ratios scope is 0.7~0.9.
6. it is a kind of determine image procossing threshold value device, it is characterised in that including：
Up-and-down boundary determining module, for gathering banknote image and determining the up-and-down boundary of bank note in the banknote image；
Target area determining module, the border for the up-and-down boundary according to the bank note and the banknote image determines the paper
The target background region of coin image；
Threshold determination module, for according to the average value of the image pixel value of special ratios scope in the target background region with
Threshold value setting rule determines image procossing threshold value.
7. device according to claim 6, it is characterised in that the target area determining module includes：
First area determining unit, the coboundary for the coboundary according to the bank note, the banknote image determines the paper
First background area of coin image；
First start bit puts determining unit, for determining target according to the first background area of the banknote image and first threshold
The first start bit of background area is put；
First end position determining unit, for determining target according to the first background area of the banknote image and Second Threshold
First end position of background area；
First object area determination unit, the paper is determined for being put according to the first start bit with first end position
The first object background area of coin image.
8. device according to claim 6, it is characterised in that the target area determining module includes：
Second area determining unit, the lower boundary for the lower boundary according to the bank note, the banknote image determines the paper
Second background area of coin image；
Second original position determining unit, target is determined for the second background area according to the banknote image and the 3rd threshold value
Second original position of background area；
Second end position determining unit, target is determined for the second background area according to the banknote image and the 4th threshold value
Second end position of background area；
Second target area determining unit, for determining the paper according to second original position and second end position
Second target background region of coin image.
9. device according to claim 6, it is characterised in that the threshold determination module includes：
Pixel value statistic unit, for counting the image pixel value histogram in the target background region；
Average calculation unit, for choosing the pixel value of special ratios scope in described image pixel value histogram, and calculates
Its average value；
Threshold value determination unit, for setting rule based on threshold value, corresponding image procossing threshold value is matched according to the average value.
10. device according to claim 9, it is characterised in that the special ratios scope is 0.7~0.9.
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