CN1763763A - Method for recognizing watermark bar code and its recognizing device - Google Patents
Method for recognizing watermark bar code and its recognizing device Download PDFInfo
- Publication number
- CN1763763A CN1763763A CNA2004100864109A CN200410086410A CN1763763A CN 1763763 A CN1763763 A CN 1763763A CN A2004100864109 A CNA2004100864109 A CN A2004100864109A CN 200410086410 A CN200410086410 A CN 200410086410A CN 1763763 A CN1763763 A CN 1763763A
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- CN
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- Prior art keywords
- bar code
- product
- watermark bar
- watermark
- photodetector
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000000149 penetrating effect Effects 0.000 claims description 19
- 230000005622 photoelectricity Effects 0.000 claims description 19
- 230000000875 corresponding effect Effects 0.000 claims description 11
- 238000007639 printing Methods 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000003854 Surface Print Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
Images
Abstract
The invention discloses a watermark bar code identification method and device, which comprises the following steps: detecting the translucent curve reference value of detected water bar code region; picking up the watermark bar code region feature through photoelectric translucent device; comparing the corresponding region translucent curve with the reference value; solving the relative coefficient; judging the detected object not the homogenous with the setting detected object; outputting the identified result at physical quantity.
Description
Technical field
The present invention relates to the recognition methods and the device thereof of bar code, particularly a kind of recognition methods and recognition device thereof that can be used for the watermark bar code of aspects such as bank note, ticket.
Background technology
Digital watermark has been widely used in the various par value moneys in countries in the world, various ticket and the document identification as a big anti-counterfeiting technology.The formation mechanism of watermark is in the process of system paper, owing on the version that system paper uses some convex-concave lines are arranged, causes when paper is shaped, corresponding local cellulose settling ratio is more, so than other places is thick, therefore, the relevant position transmittance just has remarkable different with the place that does not have watermark.And watermark bar code thickness is even, the striped rule, and can there be obviously difference in its light transmission features with other watermark recoveries and tickets sample surface printing pattern, thus the feature that can be used as other information such as identification tickets sample Currency Type and face amount is discerned.Therefore, a kind of watermark bar code recognition methods and recognition device thereof that can be practical press for and its practical significance are arranged.
For example, distribution in 2002 Euro adopted watermark bar code, along with the different in width of face amount and variation to some extent at interval, in fact some coded messages of corresponding value of money bank note have been carried, realization can make full use of the advantage that its anti-counterfeiting characteristic is difficult for forgery to the identification of its watermark bar code, can realize that the bank note of each face amount mixes point.
Therefore, provide a kind of recognition technology scheme of brand-new bank note, financial note and document, be widely used in anti-counterfeit recognition, in the data pick device, not only can verify, can also provide data according to picking up watermark bar code for other computings simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is: recognition methods and recognition device thereof that a kind of watermark bar code is provided, this method is discerned and the individual features of extracting different survey product in the related coefficient mode, its recognition device can be discerned surveying product effectively, picks up the bar code feature.
For this reason, the present invention is a kind of recognition methods of watermark bar code, wherein,
Set and survey other watermark bar code zone printing opacity curve reference point of category;
Utilizing the photoelectricity penetrating apparatus that feature is carried out in the watermark bar code zone of surveying product picks up;
Survey product respective regions printing opacity curve that picks up and reference point relevance ratio are obtained related coefficient;
When related coefficient was lower than a specific thresholding, it was non-similar with the survey product classification of setting then to be judged to be the product of surveying.
Aforesaid watermark bar code recognition methods, wherein, the related coefficient that described related coefficient can be correlated with for the Person that linearity fits, its expression formula is:
R in the formula
XyBe the related coefficient of curve x and y, the related coefficient interval is [1,1], ss
Xy, ss
XxAnd ss
YyDefinition is respectively:
ss
xx＝∑(x
i- x)
2＝∑x
2-2n x
2+n x
2＝∑x
2-n x
2
ss
yy＝∑(y
i- y)
2＝∑y
2-2n y
2+n y
2＝∑y
2-n y
2
ss
xy＝∑(x
i- x)(y
i- y)＝∑xy-n xy
Wherein, X
i, Y
iThe physical values of respectively corresponding two curve respective regions.
Aforesaid watermark bar code recognition methods, wherein, described X
i, Y
iThe magnitude of voltage of respectively corresponding two curve respective regions is surveyed the product magnitude of voltage and is picked up acquisition with the photoelectricity penetrating apparatus.
Aforesaid watermark bar code recognition methods, wherein, the sampling interval that the product of survey are picked up by the photoelectricity penetrating apparatus is 0.5mm.
Aforesaid watermark bar code recognition methods, wherein, described related coefficient is more than or equal to 0.9.
Aforesaid watermark bar code recognition methods, wherein, described photoelectricity penetrating apparatus picks up the feature of surveying product watermark bar code zone and comprises with laser radiation survey product, receives transmitted light with photodetector, the variation of the light intensity that the output of photodetector measures and changing.
A kind of recognition device that is used for above-mentioned recognition methods, comprise a photoelectricity penetrating apparatus and analyze output unit, wherein, its photoelectricity penetrating apparatus is provided with a laser instrument, with a photodetector, between described laser instrument and described photodetector collimation lens and diaphragm are set in regular turn, one surveys product is placed between collimation lens and the diaphragm.
Aforesaid recognition device, wherein, described laser instrument adopts the laser instrument of the 808nm wavelength of 50MW.
Aforesaid recognition device, wherein, described photodetector adopts the silicon photo diode photodetector, and its output signal is a voltage signal.
Aforesaid recognition device, wherein, described laser instrument and photodetector fixedly install, and the survey product move with the horizontal direction of its watermark bar code, and the slit of described diaphragm and watermark bar code direction be arranged in parallel.
Advantage and characteristics that the present invention compared with prior art has are:
The recognition methods of watermark bar code of the present invention and recognition device thereof make full use of the characteristics of watermark bar code, identification survey product have been realized technically, and pick up the bar code feature exactly, and the result that will discern exports with physical quantity, created condition for using this recognition result.The characteristics that watermark bar code recognition methods of the present invention possesses accurately, fast, do not decrease measured object.Watermark bar code recognition device of the present invention is simple and reliable for structure, and the device of use has good reliability, and can carry out the acquisition of business procurement easily from the market, and is therefore with low cost.Owing to adopt the laser instrument of near-infrared wavelength, can reduce the influence of the product of survey picture on surface variation to transmittance, the coupling of each parts is used, and makes watermark bar code recognition methods of the present invention possess very high consistance and repeatability.The recognition methods of watermark bar code of the present invention and recognition device thereof can be applicable to possess purposes widely in the inspection machines such as cash inspecting machine.
Description of drawings
Fig. 1 is the step block diagram of watermark bar code recognition methods of the present invention;
Fig. 2 is the curve map of the recognition result of expression watermark bar code recognition methods of the present invention;
Fig. 3 is the synoptic diagram of watermark bar code recognition device of the present invention.
Embodiment
Now contrast recognition methods and recognition device thereof that accompanying drawing describes watermark bar code of the present invention in detail, thereby the technical problem to be solved in the present invention, the technical solution of taking and the technique effect that reached are had more deep understanding.
At first, see also Fig. 1, it is the step block diagram of watermark bar code recognition methods of the present invention.Recognition methods of the present invention comprises setting surveys other watermark bar code zone printing opacity curve reference point of category; Utilizing the photoelectricity penetrating apparatus that feature is carried out in the watermark bar code zone of surveying product picks up; Survey product respective regions printing opacity curve that picks up and reference point relevance ratio are obtained related coefficient; When related coefficient was lower than a specific thresholding, it was non-similar with the survey product classification of setting then to be judged to be the product of surveying, otherwise judgement survey product are similar with the survey product classification of setting.
In the method, the photoelectricity penetrating apparatus utilizes laser radiation to survey product, accepts transmitted light with photodetector, by measuring the Strength Changes of transmitted light, extracts the characteristic signal of the product of survey.Because the characteristics of watermark, laser radiation have the position of watermark and the position of the no watermark of irradiation, there is different transmitted intensities, in the present invention, the transmitted intensity variation of surveying product is converted into comparable physical quantity.
Relatively adopt correlation coefficient process, the related coefficient that can be correlated with for the Person that linearity fits, its expression formula is:
R in the formula
XyBe exactly the related coefficient of curve x and y, the related coefficient interval is [1,1], value is big more just illustrate between two curves similar more; Ss
Xy, ss
XxAnd ss
YyDefinition is respectively:
ss
xx＝∑(x
i- x)
2＝∑x
2-2n x
2+n x
2＝∑x
2-n x
2
ss
yy＝∑(y
i- y)
2＝∑y
2-2n y
2+n y
2＝∑y
2-n y
2
ss
xy＝∑(x
i- x)(y
i- y)＝∑
xy-n xy
Wherein, X
i, Y
iThe physical values of respectively corresponding two curve respective regions.In the present embodiment, described X
i, Y
iThe magnitude of voltage of respectively corresponding two curve respective regions is surveyed the product magnitude of voltage and is picked up acquisition with above-mentioned photoelectricity penetrating apparatus.Survey product by the photoelectricity penetrating apparatus pick up can interval sampling.When this method of application, X
i, Y
iPromptly can be the magnitude of voltage of other watermark bar code zone printing opacity curve of survey category of surveying product output voltage curve and setting.
See also Fig. 2, it is the curve map of the recognition result of watermark bar code recognition methods of the present invention.In this embodiment, the product of survey are the bank note of one 50 Ou Yuan, and it has the watermark bar code of three portrait configuration.Three curve B, C, D correspondences are surveyed three horizontal sampling locations of passing watermark bar code of product among the figure, are spaced apart 0.5mm in the present embodiment.By can seeing among the figure, the curve of the A district of corresponding watermark bar code part, promptly the output voltage curve of photoelectricity penetrating apparatus possesses tangible distinguishing characteristics, by the comparison of correlation coefficient process described with it, can differentiate that whether the product of survey are one 50 Euros bank note.
In watermark bar code recognition methods of the present invention, set described related coefficient more than or equal to 0.9.In other words, when other watermark bar code zone printing opacity curve correlation coefficient of the survey category of output voltage curve and setting more than or equal to 0.9, can differentiate that then the product of survey are the bank note for one 50 Euros.Otherwise, be lower than 0.9, can differentiate that then the product of survey are not the bank note for one 50 Euros.
Fig. 3 is the synoptic diagram of watermark bar code recognition device of the present invention.As seen from the figure, the watermark bar code recognition device comprises a photoelectricity penetrating apparatus and analyzes output unit, wherein, the photoelectricity penetrating apparatus is provided with a laser instrument 1, with a photodetector 5, survey product 3 and be placed between collimation lens 2 and the diaphragm 4 in that collimation lens 2 and diaphragm 4, is set between described laser instrument 1 and the described photodetector 5 in regular turn.
The laser intensity that photodetector detects depends primarily on the surperficial regions of different colours of the product of survey to absorption of incident light and the product of survey thickness, the inventor will give prominence to the transmittance variation that the product of survey variation in thickness is brought as far as possible in the selection of device, weaken the influence of other factors.
In the present embodiment, described laser instrument 1 adopts the laser instrument of the 808nm wavelength of 50MW.Described photodetector 5 adopts the silicon photo diode photodetector, and its output signal is a voltage signal, should make its laser instrument to the 808nm wavelength that higher responsiveness is arranged, as PDA555 silicon photo diode photodetector.
In watermark bar code recognition device of the present invention, described laser instrument 1 and photodetector 5 fixedly install, and survey product 3 move with the horizontal direction of its watermark bar code, and the slit of described diaphragm 4 and watermark bar code direction be arranged in parallel.
Utilize watermark bar code recognition device of the present invention, can realize by to the identification of watermark bar code with extract corresponding feature.For example, to different denominations Euro, corresponding different printing opacity curve reference point can carry out accurately, fast, not decrease the identification of measured object.Make the recognition methods and the recognition device thereof of watermark bar code of the present invention can be applicable to possess purposes widely in the inspection machines such as cash inspecting machine.
More than be a specific embodiment of the present invention only; undoubtedly the present invention is not limited to the foregoing description and the description of the drawings thereof, this area those of ordinary skill to modification of the present invention and be equal to replacement should be within the protection domain of claims of the present invention.
Claims (10)
1, a kind of recognition methods of watermark bar code is characterized in that:
Set and survey other watermark bar code zone printing opacity curve reference point of category;
Utilizing the photoelectricity penetrating apparatus that feature is carried out in the watermark bar code zone of surveying product picks up;
Survey product respective regions printing opacity curve that picks up and reference point relevance ratio are obtained related coefficient;
When related coefficient was lower than a specific thresholding, it was non-similar with the survey product classification of setting then to be judged to be the product of surveying.
2, watermark bar code recognition methods as claimed in claim 1 is characterized in that: the related coefficient that described related coefficient can be correlated with for the Person that linearity fits, and its expression formula is:
R in the formula
XyBe the related coefficient of curve x and y, the related coefficient interval is [1,1], ss
Xy, ss
XxAnd ss
YyDefinition is respectively:
ss
xx＝∑(x
i- x)
2＝∑x
2-2n x
2+n x
2＝∑x
2-n x
2
ss
yy＝∑(y
i- y)
2＝∑y
2-2n y
2+n y
2＝∑y
2-n y
2
ss
xy＝∑(x
i- x)(y
i- y)＝∑xy-n xy
Wherein, X
i, Y
iThe physical values of respectively corresponding two curve respective regions.
3, watermark bar code recognition methods as claimed in claim 2 is characterized in that: described X
i, Y
iThe magnitude of voltage of respectively corresponding two curve respective regions is surveyed the product magnitude of voltage and is picked up acquisition with the photoelectricity penetrating apparatus.
4, watermark bar code recognition methods as claimed in claim 3 is characterized in that: the sampling interval that the product of survey are picked up by the photoelectricity penetrating apparatus is 0.5mm.
5, watermark bar code recognition methods as claimed in claim 2, it is characterized in that: described related coefficient is more than or equal to 0.9.
6, watermark bar code recognition methods as claimed in claim 1, it is characterized in that: described photoelectricity penetrating apparatus picks up the feature of surveying product watermark bar code zone and comprises with laser radiation survey product, receive transmitted light with photodetector, the variation of the light intensity that the output of photodetector measures and changing.
7, a kind of recognition device that is used for the described recognition methods of claim 1, comprise a photoelectricity penetrating apparatus and analyze output unit, it is characterized in that: its photoelectricity penetrating apparatus is provided with a laser instrument, with a photodetector, between described laser instrument and described photodetector collimation lens and diaphragm are set in regular turn, one surveys product is placed between collimation lens and the diaphragm.
8, recognition device as claimed in claim 7 is characterized in that: described laser instrument adopts the laser instrument of the 808nm wavelength of 50MW.
9, recognition device as claimed in claim 7 is characterized in that: described photodetector adopts the silicon photo diode photodetector, and its output signal is a voltage signal.
10, recognition device as claimed in claim 7 is characterized in that: described laser instrument and photodetector fixedly install, and the survey product move with the horizontal direction of its watermark bar code, and the slit of described diaphragm and watermark bar code direction be arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100864109A CN100392665C (en) | 2004-10-20 | 2004-10-20 | Method for recognizing watermark bar code and its recognizing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100864109A CN100392665C (en) | 2004-10-20 | 2004-10-20 | Method for recognizing watermark bar code and its recognizing device |
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| Publication Number | Publication Date |
|---|---|
| CN1763763A true CN1763763A (en) | 2006-04-26 |
| CN100392665C CN100392665C (en) | 2008-06-04 |
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ID=36747889
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100864109A Expired - Fee Related CN100392665C (en) | 2004-10-20 | 2004-10-20 | Method for recognizing watermark bar code and its recognizing device |
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|---|---|
| CN (1) | CN100392665C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615970A (en) * | 2015-02-10 | 2015-05-13 | 优品保技术（北京）有限公司 | Anti-counterfeiting mark identifying device and identifying method thereof as well as article identification system and method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2122408U (en) * | 1991-07-11 | 1992-11-18 | 莫保民 | Paper money true-false identifying instrument |
| CN2278247Y (en) * | 1996-07-11 | 1998-04-08 | 谭伟基 | Hand-holding type false not indentifier |
| CN1286054C (en) * | 2004-06-09 | 2006-11-22 | 天津大学 | Rapid machine-readable detecting and identifying method for watermark bar codes on effective tickets |
-
2004
- 2004-10-20 CN CNB2004100864109A patent/CN100392665C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104615970A (en) * | 2015-02-10 | 2015-05-13 | 优品保技术（北京）有限公司 | Anti-counterfeiting mark identifying device and identifying method thereof as well as article identification system and method thereof |
| CN104615970B (en) * | 2015-02-10 | 2018-03-02 | 优品保技术（北京）有限公司 | Anti-counterfeiting mark identification device and its recognition methods, article discrimination system and method |
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| Publication number | Publication date |
|---|---|
| CN100392665C (en) | 2008-06-04 |
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Granted publication date: 20080604 |