CN101159806A - Anti-false processing method of embedding information at the edge of floating letters - Google Patents
Anti-false processing method of embedding information at the edge of floating letters Download PDFInfo
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Abstract
The invention relates to an anti-counterfeiting processing method to embedded information on the edge of floating words, belonging to the information processing filed. The embedment method is that a floating format anti-counterfeiting pattern image at the same time is printed on the background of certificate content of a printed media certificate, and on the basis of not changing the floating words pattern screen performance, the screen coding anti-counterfeiting information embedment is carried out on the edge of the floating words. Even if the professional personnel adopts the professional equipment and they can not identify whether and where the information is embedded. The invention is able to easily distinguish the original from the copy through the floating words effect generated during copying. The embedded anti-counterfeiting information can be completely remained on the copy after being copied; therefore, the truth and the fault of the copy can be recognized. The method can realize the anti-counterfeiting process on the common paper and has the advantages of lower induction cost and good promotion.
Description
Technical field
The invention belongs to field of information processing, especially a kind of anti-fake processing method at the edge embedded information that floats word.
Background technology
Continuous development along with business automation equipment innovative technologies such as photocopier, printer, scanners, its printing or scanning resolution are more and more higher, use the said equipment to print or to duplicate printing medium certificate documents, its effect can reach fully and mix the spurious with the genuine.In addition, printing medium certificate documents is scanned up to the purpose that forms data image in the computer, utilizes the image processing software in the computer to make amendment and to distort this image very simply by scanner to reach.
Nowadays, employed in the society not only is the original paper of various printing medium certificate documents, and under many circumstances, the copy of various printing medium certificate documents is used especially in a large number.Doing when examination as relevant department, often requiring to provide the copy of various testimonial materials, above-mentioned various printing medium certificate documents are easy to be forged or are distorted, for the forgery of copy or distort more easy.Therefore, how to printing medium certificate documents carry out false proof, and to carry out false proof to the copy of this printing medium certificate documents be the big problem of pendulum in current society, be badly in need of a kind ofly can carrying out effective false proof anti-tamper technical support to printing medium certificate documents and copy thereof.
Printing medium certificate documents is carried out false proof anti-tamper, traditional method can be adopted and anti-duplicate special-purpose paper verification documented evidence part and carry out false proof processing.It uses the special anti-counterfeiting paper that has shading to carry out the making of certificate documents, when this certificate documents is duplicated, will present the floating word information that is hidden in the shading on the copy, therefore can distinguish certificate documents and copy thereof at an easy rate.But said method need use special-purpose cheque paper, problem such as therefore have processing cost height, popularization difference and cost an arm and a leg, and also this method can only be carried out false proof processing at original paper.The up-to-date anti-counterfeiting technology of Japan mainly is to make some codings on printing medium certificate documents Chinese glyph, and these codings are embedded on the paper, in case certificate documents is distorted, coding will change, and can judge whether certificate documents is distorted.Because what this method adopted is the technology of digital watermarking, can not imbed bulk information on paper, coding can only carry out on literal seldom, is difficult to prevent that fully the content of certificate documents from being distorted.In addition, especially seldom for the report of the tamper-resistance techniques of the copy of certificate documents.
Adopt the half-tone screen code technology can realize that not only the printed words of floating words such as " duplicating " or engineering noise appear in certificate documents after duplicating, and can be with the issuing date of certificate documents, the patent that data such as distribution unit are embedded in the floating word is delivered " anti-fake processing method of printing medium certificate documents and copy thereof " (200610015373.1)., the data of this certificate documents are imbedded method, are found the information that is embedded with than being easier to somewhere by the professional.
In sum, prior art can't thoroughly solve the existing false proof anti-tamper problem of printing medium certificate documents, especially copy.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, though propose that a kind of professional is difficult to also that discovery is embedded with information somewhere carry out false proof anti-tamper processing method at printing medium certificate documents.
The present invention solves its technical problem and takes following technical scheme to realize:
Should it is characterized in that at the anti-fake processing method of the edge embedded information of floating word: the anti-fake processing method step in the information of imbedding at the edge of floating word is as follows:
(1) reads all data in the certificate documents that comprises document, image, and be converted into the certificate documents image;
(2) read the anti-counterfeiting information that to imbed, and convert this anti-counterfeiting information to half-tone screen code;
(3) on the background of certificate documents image, make the shading image that constitutes by big pixel of shading and the little pixel of shading; Search the point on the floating word image edge of shading, simultaneously do not changing the floating word that pixel constituted big in the shading, or figure, or on the edge of image on the basis of pixel characteristic, use the floating word of the site of half-tone screen code with the big pixel formation of shading in the shading, or figure, or edge of image place pixel replaces, and will have the edge of the floating word image of screen coding embedded shading of anti-counterfeiting information;
(4) certificate documents image and the printing image that the shading image of imbedding anti-counterfeiting information constitutes are printed output.
And, the displacement of point that in the described screen coding embedded shading image that will have an anti-counterfeiting information is the edge of the floating word that constitutes with the big pixel of shading by half-tone screen code realizes, anti-counterfeiting information be embedded in by the big pixel of shading arrange form comprise literal, figure, image is in the edge of the floating word image of screen of interior arbitrary shape.
And, after described anti-counterfeiting information 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.
And described half-tone screen code is made up of the site of the half-tone screen code of the geometry form that comprises shape, direction, size and location.
And described half-tone screen code is made up of the site of the half-tone screen code of the physics form that comprises concentrated dispersion, modulation system, the direction of propagation and mechanics center of gravity.
And, be to realize that with the displacement of the big pixel of shading promptly anti-counterfeiting information is to be embedded in the big pixel of shading in the described screen coding embedded shading image that will have an anti-counterfeiting information by half-tone screen code.
And described shading image is the image of the Two dimensional Distribution that is arranged to form of more than one figures of being made of big pixel of shading and the little pixel of shading.
And described shading image comprises the floating word image of screen that is arranged in the arbitrary shape that comprises literal by the big pixel of shading.
And described shading pixel comprises pixel and the little pixel of shading that shading is big.
And the described anti-counterfeiting information content of imbedding comprises certificate documents content, trace information, duplicates a kind of or wherein several the synthesizing of forbidding in code, the secret writing information.
And described trace information comprises printing device type, printing person, time-write interval.
Description of drawings
Fig. 1 is the method flow diagram of imbedding of the present invention;
Fig. 2 is the schematic diagram of one group of shading pixel;
Fig. 3 is the schematic diagram of the site of half-tone screen code;
Fig. 4 is the schematic diagram of the site form of other a few networking screen codings;
Fig. 5 is that maximum similar degree is the example of 1/2 half-tone screen code between code;
Fig. 6 is the example with the half-tone screen code of the site formation of the half-tone screen code of geometry form and physics form;
Fig. 7 is the enlarged diagram of the figure of shading pixel composition;
Fig. 8 is arranged in the shading master drawing that comprises the floating word function of having of literal by the big pixel of shading;
Fig. 9 is that the site of half-tone screen code is embedded in the enlarged diagram in the floating word of shading;
Figure 10 is with screen coding embedded certificate documents and copy schematic diagram thereof in floating word shading;
The 101st, the pixel that shading is big;
The 102nd, imbed the half-tone screen code site of anti-counterfeiting information;
The 201st, the pixel that shading is big;
The 202nd, the pixel that shading is little;
The 203rd, imbed the half-tone screen code site of anti-counterfeiting information.
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.
Pixel described in the present invention is the least unit of composing images, the site is the pairing screen least unit of pixel with the least unit of composing images, the least unit point that the site can be printed by printing equipment is formed, and half-tone screen code is made up of the site.
Shading pixel characteristic is to be the number of the point on the unit are by the shading gray values of pixel points, and the shape of shading pixel is profile particularly, particularly center these three parameters decisions of the position of shading pixel.In the present embodiment, according to printing screen principle, when pixel is not on the gradation of image border,, can think that the pixel characteristic can not change even some variations take place for the shape of pixel or direction.In addition, when pixel was not on the gradation of image border, the center of pixel or size some variation a little can think that also the pixel characteristic can not change.
Fig. 2 be present embodiment employed be two kinds of shading pixels, wherein Fig. 2 (a) is the big pixel of shading, this pixel is the pixel that can be copied, Fig. 2 (b) is the little pixel of shading, generally is designed to the pixel that can not duplicate.
Fig. 2 has only listed the example of one group of shading pixel, in fact not only has only the shading pixel of above-mentioned form, and all shading pixels of forming according to similar type all belong within the scope of the present invention.
Fig. 3 is the example of the site of the employed half-tone screen code of present embodiment, and big spot distribution site, this site all are the site that can duplicate, and the shape of promptly duplicating the site, back big variation can not take place.
Fig. 4 is the site of the half-tone screen code of the site of half-tone screen code of other several geometry forms and physics form, (a wherein, b) the place line display is the site of the half-tone screen code that is made of different shapes, and (c, d) the place line display is the site of the half-tone screen code that is made of different directions.(e, f) the place line display is the site of the half-tone screen code that is made of different modulation systems, (e wherein, f) be expert at the left side for concentrating the site of the half-tone screen code that distributes, the present invention can be considered as the site of concentrating the half-tone screen code of distribution the site of amplitude modulation half-tone screen code, the i.e. site of AM half-tone screen code; (e, f) the right of being expert at is the site of the half-tone screen code of dispersed and distributed, the present invention can be considered as the site of the half-tone screen code of dispersed and distributed the site of frequency modulation half-tone screen code, the i.e. site of FM half-tone screen code.(g, h) being expert at also is the site of the half-tone screen code that is made of different modulation systems of expression, it be with (e, f) be expert at the site of half-tone screen code of the right dispersed and distributed carry out a little some distortion just constituted (g, h) be expert on the right of the site of half-tone screen code of dispersed and distributed.(i, j) the place line display is the site of the half-tone screen code that is made of the different directions of propagation.(k, l) the place line display is the site of the half-tone screen code that is made of different centers of gravity.Code " 1 " is represented in the site of the half-tone screen code of the left side one row among Fig. 4, and code " 0 " is represented in the site of the half-tone screen code of the right one row.
Fig. 4 has only listed the example of site of the half-tone screen code of the site of half-tone screen code of several geometry forms and physics form.Not only have only this several forms, every all geometry forms of difformity, different directions, different size, diverse location that comprise all can constitute the site of half-tone screen code of the present invention; And every property that comprises concentrated dispersing mode, different modulating mode, the different direction of propagation, different centers of gravity form of science all can constitute the site of half-tone screen code of the present invention, and all site forms according to the half-tone screen code that similar type is formed all belong within the scope of the present invention.
For following description, we guide goes into the minimized notion of maximum similar degree between the screen 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 distance be the number of different code position between code, k, l=0,1,2 ... m-1.
Fig. 5 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 present embodiment adopts has higher recognition resolution below 1/2 in the identification of half-tone screen code.
The site of the site of the half-tone screen code of several geometry forms that provide among Fig. 4 and the half-tone screen code of physics form can be the example formation half-tone screen code of the half-tone screen code below 1/2 by maximum similar degree between Fig. 5 code all.
Fig. 6 is that the site of the half-tone screen code of the site of half-tone screen code of several geometry forms that will provide among Fig. 4 and physics form is the example of the half-tone screen code that constitutes under the situation of G4 (10101010) by the code value among Fig. 5.
Fig. 7 arranges the enlarged diagram that constitutes a width of cloth shading image by several graphics combine that the big pixel of shading and little these the two kinds of shading pixels of pixel of shading constitute.These figures can be different shapes such as square, circular, octangle.In the present invention, shading image adopts exactly by several such pattern arrangement and can make the observer visually produce a kind of effect, promptly at the two dimensional image that is difficult under the lower situation of printing precision distinguishing between the little pixel of big pixel of identification shading and shading.Shading image is to be arranged in the floating word image shading of the screen with arbitrary shape that comprises literal by the big pixel of shading.
What Fig. 8 represented is in the false proof shading image that prints on the background of certificate proof content, is arranged the pattern of the floating word image of screen that is constituted according to the combination of shapes of floating word literal by the big pixel of shading.The anti-counterfeiting image that constitutes floating font formula can be literal, or figure, or different shape such as image.Fig. 8 is floating Zi “ No " pattern.Wherein 101 indications is the big pixel of shading that constitutes floating word image, 102 indications be the half-tone screen code site of imbedding anti-counterfeiting information.
Fig. 9 represents is that half-tone screen code site with anti-counterfeiting information is embedded in the enlarged diagram in the false proof shading image of certificate documents background come-up font formula.The half-tone screen code site is to be embedded on 10 pixels of edge of false proof shading image of floating font formula.The half-tone screen code site adopts the site very approaching or identical with the floating word pixel of shading to be embedded in the floating word image.Wherein 201 indications is the big pixel of shading, constitutes the floating word image with anti-counterfeiting information by this big pixel, and edge of image is embedded with half-tone screen code.202 the indication be the little pixel of shading.203 the indication be half-tone screen code site with anti-counterfeiting information.
In order to guarantee to produce the quality of certificate documents, the present invention is when screen coding embedded, be on the background of certificate documents, to make shading image, and in order not change shading pixel characteristic, when screen coding embedded, use site with the very approaching or identical half-tone screen code of shading pixel characteristic, replace, to reach the purpose of not destroying the shading image quality.The present embodiment provides the site of half-tone screen code shown in Figure 3 as an example.
Embodiment 1:
Be described in the process of the anti-fake processing method of the edge embedded information that floats word below in conjunction with Fig. 1:
At the anti-fake processing method of the edge embedded information that floats word, realize by screen coding embedded system.
Screen coding embedded system is installed in the computer, by the cooperate background place that can be implemented in certificate documents of main frame with equipment such as keyboard, display, printer, scanners, use the shading pixel to make shading image simultaneously, imbed half-tone screen code and printout simultaneously on common printing paper simultaneously with anti-counterfeiting information, these anti-counterfeiting information comprise certificate documents content, trace information, duplicate and forbid in code, the secret writing information one or more, wherein, trace information comprises printing device type, printing person, time-write interval etc.
The floating word edge embedded information of printing medium certificate documents to imbed method step as follows:
(1) reads all data in the certificate documents that comprises document, image that to make, and be converted into the certificate documents image;
(2) read the anti-counterfeiting information that to imbed, and convert this anti-counterfeiting information to half-tone screen code;
(3) make at the background place of certificate documents image and to form by two kinds of different shading pixels, and constitute by several little pattern arrangement, can make the observer produce a kind of effect visually, even under the lower situation of the ratio of precision of print out equipment, be difficult for recognizing the two-dimentional shading image of two kinds of differences between the different shading pixels; In two-dimentional shading image,, also a kind of big pixel in two kinds of different shading pixels is constituted the anti-fraud functional shading that has arbitrarily that comprises literal, figure, image etc. and float word image simultaneously according to the function of appointment; Search the point on the floating word image edge of shading, floating word or figure in not changing this shading, or under the prerequisite of edge of image pixel characteristic, the site of the corresponding to half-tone screen code of pixel characteristic that use and shading are big is with floating word in the shading, or figure, or the pixel at edge of image place replaces, and will have in 10 pixels at screen coding embedded shading image edge of anti-counterfeiting information;
(4) the printing image printout that certificate documents image and the shading image of imbedding anti-counterfeiting information are constituted;
Finish above-mentioned imbed process after, floating word in the shading that constitutes by big pixel, or figure, or 10 pixels of edge of image are embedded in half-tone screen code, its amplification effect as shown in Figure 9, wherein 201 expressions is big spot distribution site, the little spot distribution site of 202 expressions, 203 expressions be the half-tone screen code site.At this moment, imbedded anti-counterfeiting information at the edge of floating word.
Figure 10 is with screen coding embedded certificate documents and copy schematic diagram thereof in floating word shading, wherein Figure 10 (a) is for having imbedded the certificate documents of the half-tone screen code with anti-counterfeiting information at floating word edge, because it is screen coding embedded in the certificate documents background on the edge by the floating word of the false proof shading image of the floating font formula that is constituted of the big pixel of shading, and the characteristic of the site of half-tone screen code is consistent with the characteristic of shading pixel, so the quality of imbedding the certificate documents behind the half-tone screen code is not affected, Figure 10 (b) is the copy of certificate documents, because certificate documents has floating word shading image, therefore after duplicating, floating word pattern is significantly shown, therefore can distinguish original paper and copy at an easy rate, and, the half-tone screen code information of imbedding after the duplicating is retained in the floating word image simultaneously, can be used for the false proof anti-tamper processing to copy.
Floating word function recited above is meant: after having the floating anti-fraud functional certificate documents of word and being copied, its copy shading can occur and disappear, at the behind of proof content printed words such as Chu Xian No effect or COPY as Figure 10 (b).
The operation principle of floating word: two kinds of pixels in the shading image of formation certificate documents, the i.e. little pixel of pixel that shading is big and shading.The pixel that shading is big can be duplicated by common photocopier, can constitute literal or pattern with this pixel, and the site of the half-tone screen code of imbedding has been adopted with the big corresponding to spot distribution of the pixel characteristic site of shading and replaced; Other parts of shading then are made of the little pixel of the shading that can not be duplicated by common photocopier.In this case, duplicate back shading disappearance and be copied out the effect of the floating word of formation by literal or pattern that bigger pixel constitutes.Anti-counterfeiting information is retained on the floating word, and therefore the site of half-tone screen code, is retained in the anti-counterfeiting information that floats on the word and still can discerns not because of big variation takes place in duplicating after the duplicating; For example, when Figure 10 (a) duplicated on photocopier, the pixel that shading is big and the site of half-tone screen code were retained, and the partial loss of the little pixel of shading, therefore the pattern of being made up of a little louder shading (No effect) is significantly shown, and promptly floats the word phenomenon.
The present invention can also carry out encryption and decryption processing to the half-tone screen code of imbedding in order further to strengthen false proof anti-tamper function, and its method is as follows:
1. ciphering process: after imbedding method step 2, 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);
In step 3 half-tone screen code of having encrypted is being imbedded, method is the same.
2. decrypting process: after recognition methods step 3, 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, therefore further strengthened false proof anti-tamper function by key reaches and encryption function is complementary.
Half-tone screen code is the computer code with the e-file same form, therefore, encryption and decryption at the numerical value of half-tone screen code are not only above-mentioned method, all can all belong within the scope of the present invention all applicable encryption and decryption to half-tone screen code of the method for e-file encryption and decryption.
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.
Advantageous effect of the present invention is:
1. the present invention can prove that the anti-counterfeiting information of printing medium certificate documents legitimacy believes with half-tone screen code Breath is embedded on the printing medium certificate documents, owing to be embedded in the half-tone screen code in the printing medium certificate documents Be hidden, therefore can finely prevent that original paper is forged or is tampered; Adopt simultaneously this method also so that multiple Can keep the anti-counterfeiting information of imbedding in the printed medium original paper on the printed document, effectively guarantee net in the copy Integrality and the accuracy of screen coding can prevent well that also copy is forged or is tampered. More advance One step also can be encrypted the half-tone screen code of imbedding and decryption processing, had more strengthened false proof anti-tamper Function thoroughly solves the social negative effect that the technical development because of printer, duplicator brings.
2. the present invention synthesizes with shading image on the background of printing medium certificate documents content, and Edge at floating word on the basis that does not change shading site character carries out imbedding of half-tone screen code, therefore Can guarantee better the quality of printing and duplicate after quality.
3. the present invention has utilized the shading graphical effect that can cause people's eye illusion, even in the essence of printer Spend in the situation of lower (600dpi), also can produce at copy the effect of floating word, avoided use Some drawbacks that the special-purpose material such as dedicated paper exists, thereby greatly reduce the system of printing medium certificate documents Make cost.
With the printing medium certificate documents of anti-counterfeiting information after duplicating, the floating word content on this copy Shown significantly, therefore can more simply be distinguished original paper and copy.
5. because the present invention is on common paper, in printing certificate documents content, print out with anti-Therefore the shading of pseudo-effect has the low characteristics that are conducive to apply of cost that import.
6. the present invention's copy of effectively having solved certificate documents is tampered and the problem of forging, so that should The authenticity of copy is guaranteed, so the copy of printing medium certificate documents can access more extensive Application.
The present invention the background of certificate documents content print by the big pixel of shading consist of floating Imbed data on the edge of word, even the professional adopts the equipment of specialty also to be not easy where to find to bury Information is arranged.
Claims (2)
1. screen coding anti-counterfeiting processing method at the edge embedded information of floating word is characterized in that: at the anti-fake processing method of the edge embedded information of floating word, concrete steps are as follows:
(1) reads all data in the certificate documents that comprises document, image, and be converted into the certificate documents image;
(2) read the anti-counterfeiting information that to imbed, and convert this anti-counterfeiting information to half-tone screen code;
(3) make the shading image that constitutes by the shading pixel in the gap of certificate documents image, do not changing floating word in the shading simultaneously, or figure, or on the basis of edge of image pixel characteristic, the site of using half-tone screen code is with floating word in the shading, or figure, or the edge of image pixel replaces, and will have the edge in the screen coding embedded shading image of anti-counterfeiting information;
(4) certificate documents image and the printing image that the shading image of imbedding anti-counterfeiting information constitutes are printed output.
2. the screen coding anti-counterfeiting processing method at the edge embedded information that floats word according to claim 1, it is characterized in that: will have in the screen coding embedded shading image of anti-counterfeiting information is to realize by the displacement of half-tone screen code site with the big pixel of shading in the shading image, and half-tone screen code information is to be embedded in the edge of being arranged the floating word image of screen of the arbitrary shape that comprises literal, figure, image that forms by the big pixel of shading.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101501248A CN101159806A (en) | 2007-11-09 | 2007-11-09 | Anti-false processing method of embedding information at the edge of floating letters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101501248A CN101159806A (en) | 2007-11-09 | 2007-11-09 | Anti-false processing method of embedding information at the edge of floating letters |
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| Publication Number | Publication Date |
|---|---|
| CN101159806A true CN101159806A (en) | 2008-04-09 |
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| CNA2007101501248A Pending CN101159806A (en) | 2007-11-09 | 2007-11-09 | Anti-false processing method of embedding information at the edge of floating letters |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010099738A1 (en) * | 2009-03-03 | 2010-09-10 | Gu Zecang | Method for embedding and identifying information in print image |
| CN101867672A (en) * | 2009-03-26 | 2010-10-20 | 日本阿波罗株式会社 | Multi-information embedding method and multi-information recognising method |
| CN110288070A (en) * | 2019-07-04 | 2019-09-27 | 成都曙光光纤网络有限责任公司 | Anti-counterfeiting labels and product management systems applied to products |
-
2007
- 2007-11-09 CN CNA2007101501248A patent/CN101159806A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010099738A1 (en) * | 2009-03-03 | 2010-09-10 | Gu Zecang | Method for embedding and identifying information in print image |
| CN101867672A (en) * | 2009-03-26 | 2010-10-20 | 日本阿波罗株式会社 | Multi-information embedding method and multi-information recognising method |
| CN110288070A (en) * | 2019-07-04 | 2019-09-27 | 成都曙光光纤网络有限责任公司 | Anti-counterfeiting labels and product management systems applied to products |
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