CN1916975A - Processing method for guiding against false of paper currency - Google Patents
Processing method for guiding against false of paper currency Download PDFInfo
- Publication number
- CN1916975A CN1916975A CNA2006100156392A CN200610015639A CN1916975A CN 1916975 A CN1916975 A CN 1916975A CN A2006100156392 A CNA2006100156392 A CN A2006100156392A CN 200610015639 A CN200610015639 A CN 200610015639A CN 1916975 A CN1916975 A CN 1916975A
- Authority
- CN
- China
- Prior art keywords
- code
- paper
- tone screen
- characteristic
- screen code
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
An falseproof processing method of paper money includes fetching paper veins code being used to judge said paper money uniquely at characterized region defined on paper preparing paper money, printing out paper veins code in net-screen coding mode and covering paper money drawings on it, judging realness of paper money by identifying out code value of net-screen coding in paper money drawing then comparing it with paper veins code at characterized region.
Description
Technical field
The invention belongs to field of information processing, especially a kind of processing method for guiding against false of paper currency.
Background technology
In recent years, the incident of counterfeit note both at home and abroad often takes place, and counterfeit money spreads unchecked has directly influenced social stability, has upset financial order, the serious harm financial security, and its harm that causes has become worldwide problem.Traditional guiding against false of paper currency is handled main employing specialty inks, watermark, is imbedded bonding jumper, intaglio ink, yin yang complementarity to method for anti-counterfeit such as seals, along with the raising of printing equipment precision and the continuous development of other technologies, the paper money anti-counterfeiting technology of classic method more and more loses due usefulness, and up-to-date in the world processing method for guiding against false of paper currency mainly contains now:
1. adopt the Line View and the Metallic View of holographic technique false proof, as: 10,000 yen and 1,000 yen of antifalsification labels that use holographic technique recently of yen, when changing the direction of bank note, can see two kinds of different literal.The characteristics of this method are very directly perceived, but ordinary people's naked eyes Direct Recognition bank note true and false just.But, this is a kind of method for anti-counterfeit that relies on the antiforge equipment that becomes more readily available on the market to realize, therefore, the effect of this guiding against false of paper currency does not comply with one's wishes, also, more be not suitable for the application of the automatic anti-counterfeit recognition of bank note on equipment such as automatic machine or automatic vending machine because it does not have the characteristic that is automatically recognized.
2. adopt the Copy Check of floating word of printing screen and heavy word technology false proof, after in a single day bank note be copied, invisible literal of naked eyes or pattern can display on copy.
3. adopt the mode of the identification of photoelectricity distinguishingly dot matrix: this method is discerned automatically in order to carry out bank note on equipment such as automatic machine or automatic vending machine, is printed with different dot matrix on some position of bank note, so that can judge it is the sort of bank note during optoelectronic scanning.But, under the condition of high precision scanning machine that is seen everywhere on the market and high precision printing machine, the unauthorized person that this method give to be made counterfeit money provides chance, utilize at present equipment such as automatic machine or automatic vending machine carry out unlawful activities very wildness be exactly an example.
4. employing digital watermark technology: this method is utilized digital watermark technology to imbed certain anti-counterfeiting characteristic information on bank note to carry out the printing of bank note, and the method that can discern anti-counterfeiting characteristic information.This employing digital watermark technology carries out guiding against false of paper currency, has represented the trend of guiding against false of paper currency.But information is in any case imbedded, and all is the distribution that presents two-dimensional lattice on bank note, and by high-precision scanner, the content of its digital watermarking all can be duplicated fully, and therefore, this method can not solve the anti-pseudo problem of bank note fully.
Generally speaking, above-mentioned paper money anti-counterfeiting technology all can not thoroughly solve the problem that bank note is forged, and can not carry out effective recognition to counterfeit money.People wait in expectation and a kind ofly can carry out property settings to each bank note, even use high-precision scanning and copying device also can't forge to bank note, and the problem that is forged with thorough solution bank note.
Day patent of the present disclosure " paper identification according to attach together put and paper identification according to closing method " (spy opens 2004-102562) proposed a kind of method that can set the unique trait of every a piece of paper by the image of observing the indefinite shape that the stochastic distribution by being interweaved in the vegetable fibre produces in the paper.This method is called the paper fingerprint with the image of the indefinite shape that vegetable fibre in the paper is produced by the stochastic distribution that is interweaved, and that is to say that the paper fingerprint is equivalent to have the characteristics of people's fingerprint.But what should arouse attention is: in this patent only to paper in the size of vegetable fibre done such description, promptly the diameter of vegetable fibre is 4-70 μ m in the paper, length is 0.25-50mm.But to the distribution character of vegetable fibre, the size of viewing area etc. is not elaborated.The result who passes through to come with the transmissivity of viewing area integral image the computation paper line that this method provides, error ratio is bigger.Can not solve by paper and pollute, outmoded grade is brought the problem of the variation of transmissivity.This method also provides the recognition methods of similar fingerprint in addition, has both discerned the result of paper fingerprint by the position of intersecting point that calculates vegetable fibre, because of the paper fingerprint does not have fingerprint lines like that clearly, so acquire a certain degree of difficulty in practical application.Having, how this technical scheme will be configured to the difficult problem of computer code by the paper fingerprint that vegetable fibre constitutes if having been avoided again, and need the original together paper fingerprint image of preserving to shine when identification and close.Therefore, this technical scheme can not be applied to not specific bank note is carried out truth identification.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, proposition will make that distinctive paper line characteristic information is embedded in this paper in the paper of bank note, and can effectively discern a kind of processing method for guiding against false of paper currency with thorough solution guiding against false of paper currency problem to being embedded in paper line characteristic information in this paper.
The present invention solves its technical matters and takes following technical scheme to realize:
This processing method for guiding against false of paper currency is characterized in that: comprise the generation disposal route of bank note and the identification disposal route of bank note, wherein, the generation process method step of bank note is as follows:
(1) use transmitted light source type scanister to read the view data in several features zone on the bank note by the transmission scan mode;
(2) calculate the transmissivity of each pixel of the view data of each characteristic area respectively, discern the cloud form characteristic of each characteristic area, convert thereof into paper line code according to the result of identification;
(3) this paper line code is converted to the half-tone screen code image of latticed form;
(4) the half-tone screen code image printing after will changing is on this bank note paper;
(5) designed bank note pattern covers is printed on this half-tone screen code image-region;
The identification process method step of bank note is as follows:
(1) use transmitted light source type scanister to read transmitted light images data on the bank note by the transmission scan mode;
(2) by reading the transmissivity at half-tone screen code position, obtain the half-tone screen code image;
(3) discern this half-tone screen code image, and this half-tone screen code image transitions is become the represented paper line code of half-tone screen code;
(4) calculate the transmissivity of each pixel of the view data of each characteristic area respectively, discern the cloud form characteristic of each characteristic area, convert thereof into paper line code according to the result of identification;
(5) half-tone screen code is represented paper line code compares with the paper line code that identifies, thereby can judge the true or false of this bank note.
And, after described paper line code converts half-tone screen code to, this half-tone screen code is encrypted as follows: the numerical value of half-tone screen code or lattice position r ∈ R, with secret key k ∈ K and encryption function ￠ (k, c) carry out following calculating, realize the encryption of half-tone screen code:
R * K → C and r → ￠ (k, c);
Can realize as follows encrypted half-tone screen code is decrypted: encrypted half-tone screen code c ∈ C, usefulness secret key k ∈ K and decryption function ￡ (k c) carries out following calculating, realizes the deciphering of half-tone screen code:
C * K → R and ￡ (k, c) k ∈ K.
And described cloud form characteristic is under the irradiation of transmitted light, resulting black clouds characteristic, thin cloud characteristic and cloudless characteristic after the transmissivity of each pixel by the paper print image data in the calculated characteristics zone.
And described paper line code is that the code value by the black clouds characteristic in each characteristic area, thin cloud characteristic and cloudless characteristic representative constitutes.
And described half-tone screen code is with paper line code and check code is combined and be that rule below 1/2 constitutes according to maximum similar degree between code.
And described half-tone screen code can use one dimension bar shaped half-tone screen code, perhaps uses two-dimentional half-tone screen code.
And, described characteristic area can be on paper continuous distribution, can also be on paper Discrete Distribution.
And described transmitted light source type scanister comprises transmitted light source type scanner and the transmitted light source type CCD camera head that can observe paper line cloud form characteristic.
And the printing material that comprises ink powder of laser printer, ink for ink-jet printer, infrared ray ink, fluorescent ink and magnetic ink is adopted in the printing of described half-tone screen code image.。
Advantage of the present invention and good effect are:
1. the present invention has utilized specific paper line feature in the paper of making bank note, distinctive paper line feature in the bank note is directly converted to computer code, and the form of this code with half-tone screen code be embedded on the bank note, because it is unique having the paper line feature of former person's character on the bank note, can't duplicate; Therefore when bank note being carried out whether true and false identification, paper line code and the half-tone screen code that has paper line feature on this bank note can be compared, promptly can accurately judge the true and false of bank note, simultaneously, also can carry out encryption and decryption processing to the half-tone screen code of imbedding, further strengthen its security, adopted this method can thoroughly solve the problem that bank note is forged.
2. the present invention is the below that half-tone screen code is printed on the bank note pattern, half-tone screen code is covered by the bank note pattern fully, therefore, half-tone screen code is in hidden state fully, although use high-accuracy scanning device also the half-tone screen code information of imbedding on the bank note all cannot be duplicated out, this is to have the advantages that thoroughly to solve the bank note forgery problem on from another point of view.
3. because bank note paper line Feature Recognition is carried out automatically, therefore be particularly suitable for the application on the equipment such as automatic vending machine, automatic machine, can take precautions against the illegal activity that utilizes automatic vending machine, automatic machine to carry out counterfeit note effectively.
4. because paper line feature has not evanescent characteristic and high robust that half-tone screen code had, damaged even bank note occurs, under the situation about polluting etc., still have the characteristics that can accurately discern forge or true or paper money.
Description of drawings
Fig. 1 is the generation process flow figure of bank note;
Fig. 2 is the identification process flow figure of bank note;
The paper line design sketch that Fig. 3 sees at microscopically;
The scanning synoptic diagram of Fig. 4 transmitted light source type scanner;
The scanning synoptic diagram of Fig. 5 transmitted light source type CCD camera;
The paper line synoptic diagram of the characteristic area of Fig. 6 continuous distribution;
The paper line synoptic diagram of the characteristic area of Fig. 7 Discrete Distribution;
The synoptic diagram of Fig. 8 one dimension bar shaped half-tone screen code;
The synoptic diagram of Fig. 9 two dimension half-tone screen code;
Figure 10 is embedded with the schematic cross-section of the bank note of half-tone screen code.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is further described, but embodiment of the present invention is illustrative, rather than determinate.
The paper line is meant when paper is made, be by a large amount of such as the such vegetable fibre of timber through being processed into, on the finished product paper, can see with magnifier that the different vegetable fibre of thickness is crisscross and have such as the similar lines of the lines of the hand.Have data to show that these lines are when papermaking, by width at 4 μ m to 70 μ m, to be 0.25mm form by irregular arrangement to the vegetable fibre of 50mm length, this irregular arrangement is artificially can not imitate to produce.In addition, the result proves through bulk sampling, though also each tool difference of its paper line of paper of same model, and also this paper can not cause big influence even paper is subjected to variable color, pollution etc. to the result of identification after using for many years.
The little image that certain position on a piece of paper shown in Fig. 3 (a) reads, the present embodiment is found during such as such pattern on observing a large amount of paper, on macroscopic view, on so little image, do not see crisscross vegetable fibre, but the spot of picture cloud form.But when amplifying more than 100 times shown in Fig. 3 (b); Can find, the width of crisscross vegetable fibre and length become the state of two-stage differentiation on the paper, both little vegetable fibre width has only tens um, and the length majority is about tens of μ m, and big vegetable fibre width is hundreds of μ m greater than tens μ m length majority unexpectedly.And the quantity of big vegetable fibre is well below the quantity of little vegetable fibre.The density of the distribution of a large amount of little vegetable fibres also has the situation of two-stage differentiation, the situation polarization that both high density has distributed and low-density distributes.And when high density distributed, a large amount of often little vegetable fibres clustered round one or several big vegetable fibre.Cluster round one or several big vegetable fibre weave in by these a large amount of little vegetable fibres just and present netted backbone, the centre of the mesh that is surrounded by netted backbone also has some empty phenomenons, has both presented the zone that does not have or have only seldom little vegetable fibre.Above-mentioned just such situation, what see on macroscopic view on the paper is the spot of picture cloud form.Therefore,, depend merely on the transmissivity in a certain zone of observation, be easy to the influence that polluted by paper if the observation area is not limited.In addition, by a certain vegetable fibre of identification and the crossing position of another vegetable fibre, difficulty is very big in practical application.
We are with the size dimension characteristic of the vegetable fibre that has in the above-mentioned characteristic area, or the thick vegetable fibre Density Distribution characteristic different respectively with thin vegetable fibre, or the thick vegetable fibre distribution of shapes characteristic different respectively with thin vegetable fibre is called the cloud form characteristic of characteristic area, during the netted backbone state that wherein as (002) among Fig. 3 (b), clusters round by a large amount of little vegetable fibres that one or several big vegetable fibre weave in constitutes, be called the black clouds characteristic; The centre of the mesh that is surrounded by netted backbone as (001) among Fig. 3 (b) also has some empty phenomenons, has both presented when not having or having only seldom little vegetable fibre regional, is called cloudless characteristic; As (003) among Fig. 3 (b), during by the little vegetable fibre weave in of majority regional, also can be described as thin cloud characteristic.
The present invention is at first to viewing area, the size dimension that is characteristic area limits: characteristic area is square, this foursquare length of side only should narrow down to bigger than the mean breadth of the summation that is clustered round one or several big vegetable fibre weave in by a large amount of little vegetable fibres, is generally tens of μ m and is advisable to hundreds of μ m.Then, according to cloud form phenomenon on the paper, focus on the transmissivity of each pixel of paper print image in the recognition feature zone, rather than as disclosed technology, just observe the projection ratio of entire image, from the transmissivity result of each pixel, infer the cloud form characteristic that the paper print image is had in each characteristic area, if characteristic area is the black clouds characteristic, this characteristic area is defined as code " 2 ", if characteristic area is cloudless characteristic, this characteristic area is defined as code " 1 ", if characteristic area is defined as code " 0 " for thin cloud characteristic with this characteristic area.Specifically convert computer code to as shown in Table 1:
Table one
| The black clouds characteristic | Thin cloud characteristic | Cloudless characteristic | Code value |
| ● | 0 | ||
| ● | 1 | ||
| ● | 2 |
Can be defined by last table: the paper line code with characteristic area of thin cloud characteristic is 0, and the paper line code with characteristic area of cloudless characteristic is 1, and the paper line code with characteristic area of black clouds characteristic is 2.
The present invention infers the cloud form characteristic that the paper print image is had in each characteristic area from the transmissivity result of each pixel, like that only observe certain regional projection ratio that in essence difference is arranged with public technology; If use and only to observe the gimmick of certain regional transmissivity be, when cloudless or black clouds just are in a half of viewing area, the differences in transmission when all being on the viewing area with cloudless or black clouds is bigger, causes the mistake in the differentiation easily.And the present embodiment is by the method for pattern-recognition, as long as find cloudlessly at characteristic area, black clouds or thin cloud just can be made right judgement.And the correct judgement of making by the method for pattern-recognition also is not subjected to the pollution of paper and outmoded influence.
More than, just provide the example that paper line state transformation on the deciding characteristic area is become computer code, these several modes not only, all utilize the cloud form characteristic of paper line, both utilized the size dimension characteristic of above-mentioned vegetable fibre in the paper, or the big vegetable fibre Density Distribution characteristic different respectively with little vegetable fibre, or the big vegetable fibre distribution of shapes characteristic different respectively with little vegetable fibre, or the size constraint characteristic of viewing area, the definition of computer code that viewing area is carried out all belong in the scope of this implementation method.
The present invention utilizes distinctive unique paper line characteristic in the paper just, paper line eigentransformation unique in the bank note is become computer code, and be transformed into half-tone screen code with this code or with this code dependent code value, and imbed on the bank note with the form of half-tone screen code, be printed on the zone of half-tone screen code then, republish the bank note pattern, the half-tone screen code of imbedding is covered up tightly.Though the fake producer can adopt high-precision scanner that image informations whole on the bank note is all duplicated out, but the paper line feature on the bank note is unique not reproducible, have the half-tone screen code of imbedding also to be covered up again, this also is important measures that can't copy tightly.Therefore when needed, as long as judge whether the paper line code of bank note is consistent with the half-tone screen code of imbedding in advance, just can be easy to identify the true and false of bank note.
Transmitted light source type scanister used in the present invention can be a transmitted light source type scanner, also can be transmitted light source type CCD camera.Shown in Figure 4 is the scanning synoptic diagram of transmitted light source type scanner, wherein, light source 101 be positioned at be scanned paper 103 directly over, linear CCD photoelectric coupled device 102 is positioned on the guide rail 104 that is scanned paper sheet underneath, the linear CCD photoelectric coupled device move left and right that drive motor 105 drives on the guide rail scans being scanned paper, light source irradiation is being scanned on the paper, and impinges upon on the linear CCD photoelectric coupled device through paper, and the linear CCD photoelectric coupled device carries out the picture signal conversion.
The scanning synoptic diagram of transmitted light source type CCD camera shown in Figure 5, wherein light source 201 is being scanned a side of paper 202, the CCD camera is positioned at the opposite side that is scanned paper, its course of work: light source irradiation is being scanned on the paper, and see through paper and impinge upon on the transmitted light source type CCD camera, transmitted light source type CCD camera carries out the picture signal conversion to its signal.
The present invention can use one dimension bar shaped half-tone screen code as shown in Figure 8, and its bar shaped half-tone screen code is made up of with disperseing the site concentrated site, and this half-tone screen code has provided composition and 16 corresponding encoded radios thereof of half-tone screen code.Fig. 8 is an example of one dimension bar shaped half-tone screen code, but is not only the one dimension bar coding that has only above-mentioned a kind of mode, and all half-tone screen codes of forming according to similar type all belong to scope of the present invention.As: the screen site can also be made up of with disperseing the site the concentrated site of other gray shade scales, or by the half-tone screen code that other geometry forms or physics form are formed, can be 8 codings, also can be 16,32 or more high-order coding.
The present invention can also use two-dimentional bar shaped half-tone screen code as shown in Figure 9.Here a listed just example of a two-dimentional half-tone screen code, but be not only the two-dimentional half-tone screen code that has only above-mentioned a kind of mode, all half-tone screen codes of forming according to similar type all belong to scope of the present invention.
In the present invention, the mode in selected characteristic zone, can be as shown in Figure 6, choose the characteristic area of the continuous distribution of a fixed area on the paper 301, demonstrate the inside paper line cloud form feature of continuous n characteristic area of this areal distribution after this fixed area is amplified, from the image of these characteristic areas, be transformed into computer code respectively as stated above respectively.
The mode in selected characteristic zone can also be chosen the characteristic area of n Discrete Distribution on the paper 301 as shown in Figure 7, is transformed into computer code from the image of these characteristic areas as stated above respectively.
The number n of above-mentioned characteristic area can select different numbers as required, can be the Any Digit greater than 0, and the value with n is made as 8 in the present embodiment.
Process flow diagram below in conjunction with Fig. 1 and Fig. 2 is specifically described the present invention:
A kind of processing method for guiding against false of paper currency comprises the generation disposal route of bank note and the identification disposal route of bank note, during realization, form by the bank note print process system and the paper money recognition disposal system of the identification disposal route that realizes bank note of the generation disposal route that is contained in the realization bank note in the computing machine in advance.Bank note generates disposal system and the paper money recognition disposal system is made a plate by CTS, the recognition device of being made up of transmitted light source type scanner is discerned the paper line code of each bank note, and high-speed printer (HSP) is printed the cooperation of equipment such as a half-tone screen code and a bank note intaglio press printing paper pattern and finished the inventive method.
The present invention is not limited to said method to the printing of half-tone screen code, and is relatively good for what half-tone screen code was hidden, can identify easily again, and half-tone screen code also can use the infrared ray ink printing, the fluorescent ink printing.Can also print magnetic ink on the paper earlier, then, paper line code and half-tone screen code are being recorded in the magnetic ink.
As shown in Figure 1, the generation process method step of bank note is as follows:
(1) use transmitted light source type scanister to utilize the transmission scan mode to read the view data in several features zone on the bank note paper, here, we can read the characteristic area of 8 continuous distribution;
(2) calculate the transmissivity of each pixel of the paper print image of each characteristic area respectively, and the cloud form characteristic of pressing the paper line, both utilized the size dimension characteristic of above-mentioned vegetable fibre in the paper, or the big vegetable fibre Density Distribution characteristic different respectively with little vegetable fibre, or the big vegetable fibre distribution of shapes characteristic different respectively with little vegetable fibre, and according to the result of the transmissivity of each pixel of each characteristic area that calculates, discern the cloud form characteristic that is had of each characteristic area respectively, result according to identification is transformed into paper line code, if promptly characteristic area is the black clouds characteristic, then the paper line code of this characteristic area representative is " 2 ", if characteristic area is cloudless characteristic, then the paper line code of this characteristic area representative is " 1 ", if characteristic area is thin cloud characteristic, then the paper line code of this characteristic area representative is " 0 ";
(3) convert the half-tone screen code image of dot matrix distribution form to this paper line code or with the code dependent code value of this paper line, here half-tone screen code can use one dimension bar shaped half-tone screen code;
(4) the half-tone screen code image printing after will changing is on this bank note paper;
(5) with designed bank note pattern through repeatedly printing, cover on the zone of this half-tone screen code image place bank note paper, make the zone be printed on half-tone screen code be covered and be hidden by the bank note pattern.
Pass through said method, paper line eigentransformation unique in the bank note paper can be become computer code, and the form of this code with half-tone screen code be embedded on the bank note, republish the bank note pattern in the zone that is printed on half-tone screen code then, finish the making of paper line feature bank note.
In the present embodiment, the transmissivity of pixel is calculated as follows:
t＝t2/t1
Wherein, the transmissivity of this pixel of t, t1 is clog-free transmitted light intensity, t2 is the characteristic area transmitted light intensity.The bank note that is embedded with half-tone screen code that prints as stated above, its cross section signal as shown in figure 10, on the shading 401 of paper, be embedded with half-tone screen code 402 as can be seen, on half-tone screen code, be coated with bank note pattern 403, the bank note of Xing Chenging is irregular at last, promptly has the position of half-tone screen code to have other positions trickle protrusion is arranged.Utilize material different of material and printing bank note pattern of the half-tone screen code of printing, to the difference of the transmissivity of a certain spectrum, or to the characteristics on an equal basis of the absorptivity of a certain spectrum, the method by digital filtering extracts the image of half-tone screen code.
The printing of half-tone screen code also can be adopted as transparent infrared ray ink or transparent fluorescent ink etc. and can directly be printed on the bank note.Half-tone screen code also can be by imbedding with the displacement information of carrying out of bank note pattern image vegetarian refreshments.For the photograph that can realize paper line code and half-tone screen code closes, all can carry out screen coding embedded method and all belong in the scope of the invention.
Change the mode that reads characteristic area in the foregoing description into generation processing capacity that the characteristic area that reads 8 discontinuous distributions also can be realized bank note, method is the same, no longer repeats at this.
Change the one dimension half-tone screen code that uses in the foregoing description into two-dimentional half-tone screen code, can realize the function of the generation processing of bank note equally, method is the same, no longer repeats at this.
As shown in Figure 2, the identification process method step of bank note is as follows:
(1) use transmitted light source type scanister to read transmitted light images data on the bank note by the transmission scan mode, here, what read is the view data of the characteristic area of 8 continuous distribution or Discrete Distribution on the bank note;
(2) transmissivity of each pixel by reading half-tone screen code station diagram picture obtains the half-tone screen code image;
(3) discern this half-tone screen code image, and this half-tone screen code image transitions is become the represented paper line code of half-tone screen code;
(4) calculate the transmissivity of each pixel of the paper print image of each characteristic area respectively, and the cloud form characteristic of pressing the paper line, both utilized the size dimension characteristic of above-mentioned vegetable fibre in the paper, or the big vegetable fibre Density Distribution characteristic different respectively with little vegetable fibre, or the big vegetable fibre distribution of shapes characteristic different respectively with little vegetable fibre, and according to the result of the transmissivity of each pixel of each characteristic area that calculates, discern the cloud form characteristic that is had of each characteristic area respectively, result according to identification is transformed into paper line code, if promptly characteristic area is the black clouds characteristic, then the paper line code of this characteristic area representative is " 2 ", if characteristic area is cloudless characteristic, then the paper line code of this characteristic area representative is " 1 ", if characteristic area is thin cloud characteristic, then the paper line code of this characteristic area representative is " 0 ";
(5) half-tone screen code is represented paper line code compares with the paper line code that calculates, and can judge the true or false of this bank note.
By said method, can identify the half-tone screen code data that are embedded in the bank note, compare the true and false of judging this bank note by paper line code that half-tone screen code is represented and paper line code on the bank note that calculates, finish identification disposal route to bank note.
Compare with disclosed technology, the present invention is based on the gray-scale value of the transmissivity of each pixel of paper print image when the paper print image of identification viewing area, and the method by pattern-recognition calculates the pairing code value of this paper print image.Rather than only handle at the gray scale of the whole transmissivity of the paper print image of viewing area.
When the extraction of the identification of carrying out paper line code and half-tone screen code, because paper pollutes, the mistake that reasons such as outmoded or breakage might cause identification of paper line and half-tone screen code to extract.For addressing this problem, the present invention provides the minimized notion of maximum similar degree between code, and the implication of similar degree is exactly the similarity degree between code between so-called code, and the big more representative of its value is similar more, and resolution is low more, discerns difficult more; Otherwise similar degree is more little between code, and resolution is high more, and it is easy more to discern.
In half-tone screen code, establish S
kFor message code, n are that code is long, when m is the quantity of code, maximum similar degree A between described half-tone screen code
MaxBe to be expressed from the next:
[formula 1]
d
min＝min d(S
k，S
l)
[formula 2]
In the formula: d (S
k, S
l) be code S
kWith S
lBetween both number of different code position between code of distance, k, l=0,1,2 ... m-1.
Table two is that maximum similar degree is the example of the half-tone screen code below 1/2 between code.In these 16 codes each other between immediate any one group of code the number of different value bit be greater than half the quantity that equals code length.Therefore code length of this group code is 8, and the number of different value bit is greater than and equals 4 between any one group of code.Therefore, the maximum similar degree between the code of the half-tone screen code that the present embodiment adopts has higher recognition resolution below 1/2 in the identification of half-tone screen code.In addition, maximum similar degree is that an important characteristic of the half-tone screen code below 1/2 is between code, and the form of each code is in advance as can be known, even mistake appears in the position of half code, still can judge the numerical value of code, therefore have from the function of effect from error correction.Can make following amplification according to this principle:
If S
kFor maximum similar degree between code is that message code, n below 1/2 is that code is long, when m is the quantity of code, desirable k (k=0,1,2 ..., odd number m-1) be i (i=0,2 ..., m-2), the even number of getting k be j (j=1,3 ..., m-1), and establish S
iCode is a paper line code, establishes S
jCode is paper line code S
iCheck code, by paper line code S
iWith check code S
jCan constitute the half-tone screen code S that will imbed on the bank note together by the merging of the method shown in the following table two
k, this is with paper line code and the twin example together of half-tone screen code.This half-tone screen code has equally that maximum similar degree is 1/2 between code, even and the position of half code mistake appears, still can judge the function of error correction of the numerical value of code.
Table two
| Paper line code value | Paper line code S i S 0S 2S 4S 6 | Check code S j S 1S 3S 5S 7 | Half-tone screen code S k S 0S 1S 2S 3S 4S 5S 6S 7 | Net sign indicating number code value |
| 0 | 0 0 0 0 | 0 0 0 0 | 0 0 0 0 0 0 0 0 | G 0 |
| 1 | 1 0 0 0 | 1 1 1 1 | 0# 1 0 1 0 1 0 1 | G B |
| 2 | 0 1 0 0 | 0 0 1 1 | 1# 0 1 0 0 1 0 1 | G A |
| 3 | 1 1 0 0 | 1 1 0 0 | 1 1 1 1 0 0 0 0 | G 1 |
| 4 | 0 0 1 0 | 0 1 0 1 | 1# 0 0 1 1 0 0 1 | G 9 |
| 5 | 1 0 1 0 | 1 0 1 1 | 1 1 0 0 1 1 0 1 | G 2 |
| 6 | 0 1 1 0 | 0 1 1 0 | 0 0 1 1 1 1 0 0 | G B |
| 7 | 1 1 1 0 | 1 0 0 1 | 0# 1 1 0 1 0 0 1 | G 8 |
| 8 | 0 0 0 1 | 1 0 0 1 | 1# 1 0 0 0 0 1 1 | G C |
| 9 | 1 0 0 1 | 0 1 1 0 | 1 0 0 1 0 1 1 0 | G 7 |
| A | 0 1 0 1 | 1 0 1 0 | 0 1 1 0 0 1 1 0 | G 6 |
| B | 1 1 0 1 | 0 1 0 1 | 0# 0 1 1 0 0 1 1 | G D |
| C | 0 0 1 1 | 1 1 0 0 | 0 1 0 1 1 0 1 0 | G 5 |
| D | 1 0 1 1 | 0 0 1 1 | 0# 0 0 0 1 1 1 1 | G e |
| E | 0 1 1 1 | 1 1 1 1 | 1# 1 1 1 1 1 1 1 | G f |
| F | 1 1 1 1 | 0 0 0 0 | 1 0 1 0 1 0 1 0 | G 4 |
" # " expression in the table two; G
8, G
9, G
a, G
b, G
c, G
d, G
e, G
fFirst S
0First S with paper line code
0Numerical value is opposite, but because this is known code corresponding relation, does not influence conversion and identification between the code.According to shown in the table two; Paper line code is S
iThe time, just can on bank note, imbed half-tone screen code S
k
Above-mentioned error correction method is an example, can have a lot of methods can carry out the effect and the error correction of code.Every is that the verification below 1/2 and the method for error correction all belong within the scope of authority of the present patent application with maximum similar degree between code.
The present invention also can encrypt the half-tone screen code that is embedded on the bank note, can further strengthen the function that guiding against false of paper currency is made.Concrete grammar is as follows:
1. ciphering process: the half-tone screen code after the conversion is encrypted as follows: the numerical value of half-tone screen code or lattice position r ∈ R, with secret key k ∈ K and encryption function ￠ (k c) carries out following calculating, realizes the encryption of half-tone screen code:
R * K → C and r → ￠ (k, c);
2. decrypting process: as follows encrypted half-tone screen code is decrypted: the numerical value of encrypted half-tone screen code or lattice position c ∈ C, with secret key k ∈ K and decryption function ￡ (k c) carries out following calculating, realizes the deciphering of half-tone screen code:
C * K → R and ￡ (k, c) k ∈ K.
Have only decryption function could encrypted half-tone screen code be decrypted by key reaches and encryption function is complementary.
Encryption and decryption at the lattice position of half-tone screen code also are suitable for above-mentioned method.Concrete technical scheme is: the half-tone screen code of Two dimensional Distribution is arranged in row with front and back ordinal relation by the method that last site of previous row is connected with the top site of next line.If being arranged in the preceding serial number of encryption of the half-tone screen code site of row is r ∈ R, with secret key k ∈ K and encryption function ￠ (k, c) serial number after the encryption is c ∈ C, at an example of the encryption of the lattice position of half-tone screen code is to be that the site of r ∈ R and site that serial number is c ∈ C exchange with serial number, like this, all exchanged up to all sites through repeated calculation, just can be realized the encryption of whole half-tone screen code on lattice position.
Method at the deciphering of the lattice position of half-tone screen code is: will be arranged in the serial number c ∈ C after the encryption of half-tone screen code site of row, with secret key k ∈ K and decryption function ￡ (k, c) carry out the preceding serial number r ∈ R of encryption that above-mentioned result of calculation obtains certain site, as long as the pairing site of serial number r ∈ R before pairing site of serial number c ∈ C after will encrypting and the encryption is carried out an anticommuting again, same process repeated calculation, just can realize the decrypted result of whole half-tone screen code on lattice position all by anticommuting up to all sites.
It more than is a kind of processing method for guiding against false of paper currency that the present invention proposes, but not only being suitable for guiding against false of paper currency handles, all requirements that comprise securities, cash in bank check, commercial invoice etc. have the printed matter of the paper medium of anti-tamper security function all to be applicable to the method that the present invention proposes, and all belong within the interest field of the present invention.
Claims (9)
1. processing method for guiding against false of paper currency, it is characterized in that: comprise the generation disposal route of bank note and the identification disposal route of bank note, wherein, the generation process method step of bank note is as follows:
(1) use transmitted light source type scanister to read the view data in several features zone on the bank note by the transmission scan mode;
(2) calculate the transmissivity of each pixel of the view data of each characteristic area respectively, discern the cloud form characteristic of each characteristic area, convert thereof into paper line code according to the result of identification;
(3) this paper line code is converted to the half-tone screen code image of latticed form;
(4) the half-tone screen code image printing after will changing is on this bank note paper;
(5) designed bank note pattern covers is printed on this half-tone screen code image-region;
The identification process method step of bank note is as follows:
(1) use transmitted light source type scanister to read transmitted light images data on the bank note by the transmission scan mode;
(2) by reading the transmissivity at half-tone screen code position, obtain the half-tone screen code image;
(3) discern this half-tone screen code image, and this half-tone screen code image transitions is become the represented paper line code of half-tone screen code;
(4) calculate the transmissivity of each pixel of the view data of each characteristic area respectively, discern the cloud form characteristic of each characteristic area, convert thereof into paper line code according to the result of identification;
(5) half-tone screen code is represented paper line code compares with the paper line code that identifies, and judges the true or false of this bank note.
2. a kind of processing method for guiding against false of paper currency according to claim 1, it is characterized in that: after described paper line code converts half-tone screen code to, this half-tone screen code is encrypted as follows: the numerical value of half-tone screen code or lattice position r ∈ R, with secret key k ∈ K and encryption function ￠ (k, c) carry out following calculating, realize the encryption of half-tone screen code:
R * K → C and r → ￠ (k, c);
Realize as follows encrypted half-tone screen code is decrypted: encrypted half-tone screen code c ∈ C, usefulness secret key k ∈ K and decryption function ￡ (k c) carries out following calculating, realizes the deciphering of half-tone screen code:
C * K → R and ￡ (k, c) k ∈ K.
3. a kind of processing method for guiding against false of paper currency according to claim 1, it is characterized in that: described cloud form characteristic is under the irradiation of transmitted light, resulting black clouds characteristic, thin cloud characteristic and cloudless characteristic after the transmissivity of each pixel by the paper print image data in the calculated characteristics zone.
4. according to claim 1 or 3 described a kind of processing method for guiding against false of paper currency, it is characterized in that: described paper line code is that the code value by the black clouds characteristic in each characteristic area, thin cloud characteristic and cloudless characteristic representative constitutes.
5. a kind of processing method for guiding against false of paper currency according to claim 1 and 2 is characterized in that: described half-tone screen code is with paper line code and check code is combined and be that rule below 1/2 constitutes according to maximum similar degree between code.
6. a kind of processing method for guiding against false of paper currency according to claim 5 is characterized in that: described half-tone screen code can use one dimension bar shaped half-tone screen code, perhaps uses two-dimentional half-tone screen code.
7. a kind of processing method for guiding against false of paper currency according to claim 1 is characterized in that: described characteristic area can be on paper continuous distribution, can also be on paper Discrete Distribution.
8. a kind of processing method for guiding against false of paper currency according to claim 1 is characterized in that: described transmitted light source type scanister comprises transmitted light source type scanner and the transmitted light source type CCD camera head that can observe paper line cloud form characteristic.
9. a kind of processing method for guiding against false of paper currency according to claim 1 is characterized in that: the printing material that comprises ink powder of laser printer, ink for ink-jet printer, infrared ray ink, fluorescent ink and magnetic ink is adopted in the printing of described half-tone screen code image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100156392A CN1916975B (en) | 2006-09-13 | 2006-09-13 | Processing method for guiding against false of paper currency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100156392A CN1916975B (en) | 2006-09-13 | 2006-09-13 | Processing method for guiding against false of paper currency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1916975A true CN1916975A (en) | 2007-02-21 |
| CN1916975B CN1916975B (en) | 2011-12-21 |
Family
ID=37737965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100156392A Active CN1916975B (en) | 2006-09-13 | 2006-09-13 | Processing method for guiding against false of paper currency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1916975B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102955930A (en) * | 2011-08-21 | 2013-03-06 | 深圳兆日科技股份有限公司 | Anti-counterfeiting method and system by identification by self-physical characteristics of substance |
| CN103745523A (en) * | 2013-12-26 | 2014-04-23 | 北京中科金财科技股份有限公司 | Apparatus and method for identifying bill mixed invisible anti-counterfeit information |
| CN103818136A (en) * | 2014-02-18 | 2014-05-28 | 立德高科(北京)数码科技有限责任公司 | Method using printer to cover lattice graph with monochromatic color blocks and false proof mark |
| CN103942881A (en) * | 2014-04-11 | 2014-07-23 | 立德高科(北京)数码科技有限责任公司 | Equipment and method for carrying out batch anti-fake detection on presswork with raster graphics |
| CN105006058A (en) * | 2015-07-24 | 2015-10-28 | 深圳怡化电脑股份有限公司 | Paper money alteration information identification method and device |
| CN109844502A (en) * | 2016-09-15 | 2019-06-04 | 奥里拉股份有限公司 | The system and method for product certification |
| CN110599665A (en) * | 2018-06-13 | 2019-12-20 | 深圳兆日科技股份有限公司 | Paper pattern recognition method and device, computer equipment and storage medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2155989C2 (en) * | 1995-03-30 | 2000-09-10 | ВХД Электронише Прюфтехник ГмбХ | Method and device for checking documents, which are protection against faking |
| CN1598873B (en) * | 2004-08-17 | 2010-04-28 | 顾泽苍 | Network screen coding control method capable of recording mass data on paper |
-
2006
- 2006-09-13 CN CN2006100156392A patent/CN1916975B/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102955930A (en) * | 2011-08-21 | 2013-03-06 | 深圳兆日科技股份有限公司 | Anti-counterfeiting method and system by identification by self-physical characteristics of substance |
| CN102955930B (en) * | 2011-08-21 | 2021-05-11 | 深圳兆日科技股份有限公司 | Anti-counterfeiting method and system using physical characteristics of substance to identify |
| CN103745523A (en) * | 2013-12-26 | 2014-04-23 | 北京中科金财科技股份有限公司 | Apparatus and method for identifying bill mixed invisible anti-counterfeit information |
| CN103818136A (en) * | 2014-02-18 | 2014-05-28 | 立德高科(北京)数码科技有限责任公司 | Method using printer to cover lattice graph with monochromatic color blocks and false proof mark |
| CN103818136B (en) * | 2014-02-18 | 2016-01-20 | 立德高科(北京)数码科技有限责任公司 | Utilize printer on dot pattern, cover method and the anti-counterfeiting mark of monochromatic color lump |
| CN103942881A (en) * | 2014-04-11 | 2014-07-23 | 立德高科(北京)数码科技有限责任公司 | Equipment and method for carrying out batch anti-fake detection on presswork with raster graphics |
| CN105006058A (en) * | 2015-07-24 | 2015-10-28 | 深圳怡化电脑股份有限公司 | Paper money alteration information identification method and device |
| CN109844502A (en) * | 2016-09-15 | 2019-06-04 | 奥里拉股份有限公司 | The system and method for product certification |
| CN110599665A (en) * | 2018-06-13 | 2019-12-20 | 深圳兆日科技股份有限公司 | Paper pattern recognition method and device, computer equipment and storage medium |
| CN110599665B (en) * | 2018-06-13 | 2021-08-24 | 深圳兆日科技股份有限公司 | Paper pattern recognition method and device, computer equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1916975B (en) | 2011-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1259634C (en) | Encryption antiforgery method based on substance characteristics | |
| CN101159799B (en) | The digital watermarking of vital document and method | |
| CN1209730C (en) | Digital anti-fake method | |
| CN1928916A (en) | Printing medium certificate documents and false proof handling method of copy thereof | |
| CN1916975A (en) | Processing method for guiding against false of paper currency | |
| JP5685677B2 (en) | Method of generating information embedding code for mobile phone, information embedding method, and reading method thereof | |
| CN101537751B (en) | Novel method for processing anti-counterfeit printing | |
| CN101540005B (en) | Method for processing random figure code | |
| CN1252653C (en) | Method for preventing counterfeiting or alteration of printed or engraved surface | |
| CN1452116A (en) | Device and method for making and identifying file capable of verifying forging or changing thereof | |
| EP1864825A1 (en) | Printed matter, method and device for detecting such printed matter, and authentication method and device | |
| KR101712167B1 (en) | Printed materials and method for checking the authenticity of the print using the security element | |
| CN1635533A (en) | Digital stamp system | |
| CN101030294A (en) | Production of electronic-physical seal and its synthetic seal | |
| CN1290047C (en) | File anti-fake method and its device based on digital water print | |
| CN1598873A (en) | Network screen coding control method capable of recording mass data on paper | |
| CN1856797A (en) | Machine readable data | |
| CN105718981A (en) | Processing method for preparing novel 2D code image holographic anti-counterfeiting label | |
| CN1955986A (en) | A personal authentication card with vision inspection security and a method of manufacturing the same | |
| CN1217290C (en) | Automatic identification for double dimension barcode personal certificate antifakery system | |
| TWI378387B (en) | Manufacturing method of printed article having hidden bar code | |
| CN1932852A (en) | Tax control machine material characteristic encrypted antifaking method | |
| CN1691087A (en) | System and method for decoding digital coding image | |
| CN1828666A (en) | Fake proof method for printing optical holographic watermark certificate | |
| CN207123861U (en) | Bank money with hidden anti-fake code |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |