CN1928916B - Printing medium certificate documents and false proof handling method of copy thereof - Google Patents
Printing medium certificate documents and false proof handling method of copy thereof Download PDFInfo
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- CN1928916B CN1928916B CN2006100153731A CN200610015373A CN1928916B CN 1928916 B CN1928916 B CN 1928916B CN 2006100153731 A CN2006100153731 A CN 2006100153731A CN 200610015373 A CN200610015373 A CN 200610015373A CN 1928916 B CN1928916 B CN 1928916B
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Abstract
The related false proof information embedding method for print-media certificate comprises: printing the false proof shading image in certificate content gap, and embedding the false proof information of screen code on the shading without changing shading pixel feature. The corresponding recognition method comprises: scanning the print media to recognize the false proof information, and comparing both the false proof information and certificate or copy together. This invention can also recognize the copy, needs low cost, and benefit to spread.
Description
Technical field
The invention belongs to field of information processing, the anti-fake processing method of especially a kind of printing medium certificate documents and copy thereof.
Background technology
Continuous development along with business automation equipment innovative technologies such as duplicating machine, 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 computing machine, utilizes the image processing software in the computing machine 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 or the heavy word information that are 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.Up-to-date anti-counterfeiting technology 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.
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
First purpose of the present invention is to overcome the deficiencies in the prior art, propose a kind of on the basis of not destroying the shading image quality, use the printing equipment of lower printing precision, to have the screen coding embedded of anti-counterfeiting information and print output simultaneously on common paper to shading image and with certificate documents content and shading image, certificate documents by printing output can simply be differentiated original paper and copy, to realize that printing medium certificate documents is carried out false proof anti-tamper disposal route.
Second purpose of the present invention is that the anti-counterfeiting information with printing medium certificate documents is retained in the copy, thereby realizes the copy of this printing medium certificate documents is carried out false proof anti-tamper disposal route.
The present invention solves its technical matters and takes following technical scheme to realize:
The anti-fake processing method of this printing medium certificate documents and copy thereof, it is characterized in that: be included in the recognition methods of the method for imbedding and the printing medium certificate documents and the information that copy is imbedded thereof of information in the printing medium certificate documents, wherein in printing medium certificate documents information to imbed method step 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 this anti-counterfeiting information is converted to the half-tone screen code of geometry form or physics form;
(3) make in the gap of certificate documents image constitute by the shading pixel more than one arrange the shading image that forms by several figure repeated combinations, simultaneously on the basis that does not change shading pixel characteristic, use the site of half-tone screen code to replace, will have in the screen coding embedded shading image of anti-counterfeiting information with the shading pixel;
(4) certificate documents image and the printed images that the shading image of imbedding anti-counterfeiting information constitutes are printed output;
The recognition methods step of printing medium certificate documents and information that copy is imbedded thereof is as follows:
(1) scanning is embedded with the printing medium certificate documents or the copy of anti-counterfeiting information, generates scan image, and reads in internal memory;
(2) from internal memory, read a pixel of scan image, if this pixel is the site of the half-tone screen code of the geometry form of the information of imbedding in the shading or physics form, the code value that then identifies the site of this half-tone screen code is 1 or 0, this step is carried out in circulation, the site of all half-tone screen codes of the scan image in the internal memory has all been discerned, and the site of all half-tone screen codes that will identify converts half-tone screen code to;
(3) half-tone screen code is converted to computer data code and demonstration or printout.
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 the half-tone screen code of described geometry form is made of the site of at least a half-tone screen code that comprises shape, direction, size and location.
And the half-tone screen code of described physics form is made of the site of at least a half-tone screen code that comprises concentrated dispersion, modulation system, the direction of propagation and mechanics center of gravity.
And the site of described half-tone screen code comprises that the expression code is the round distribution site of " 0 " for the spot distribution site and the expression code of " 1 ".
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 by the big pixel of shading and is arranged in the floating word image of screen of the arbitrary shape that comprises literal and is arranged in the heavy word image of screen of the arbitrary shape that comprises literal by the little 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 a recognition methods process flow diagram of the present invention;
Fig. 3 is the synoptic diagram of one group of shading pixel;
Fig. 4 is the synoptic diagram of the site of networking screen coding;
Fig. 5 is the synoptic diagram of the site form of other a few networking screen codings;
Fig. 6 is that maximum similar degree is the example of 1/2 half-tone screen code between code;
Fig. 7 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. 8 is the enlarged diagram of the figure of shading pixel composition;
Fig. 9 is arranged in the shading enlarged drawing that comprises the floating word function of having of literal by the big pixel of shading;
Figure 10 is arranged in the shading enlarged drawing that comprises the heavy word function of having of literal by the little pixel of shading;
Figure 11 is that the site of half-tone screen code is embedded in the enlarged diagram in the shading;
Figure 12 is with screen coding embedded certificate documents and copy synoptic diagram thereof in floating word shading;
Figure 13 is with screen coding embedded certificate documents and copy synoptic diagram thereof in heavy word shading;
Figure 14 realizes connection diagram of the present invention on compounding machine.
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 area 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. 3 be present embodiment employed be two kinds of shading pixels, wherein Fig. 3 (a) is the big pixel of shading, this pixel is the pixel that can be copied, Fig. 3 (b) is the little pixel of shading, generally is designed to the pixel that can not duplicate.
Fig. 3 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. 4 is the example of the site of the employed half-tone screen code of present embodiment, what Fig. 4 (a) represented is the spot distribution site, what Fig. 4 (b) represented is round distribution site, and wherein the spot distribution site represents that code is " 1 ", and round distribution site represents that code is " 0 ".These two kinds of sites all are the site that can duplicate in design, and the shape of promptly duplicating the site, back big variation can not take place.
Fig. 5 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, (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 that disperse to distribute, the present invention can be considered as the site of the half-tone screen code that disperses to distribute 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 is with (e, f) the be expert at site of the half-tone screen code that the right disperse to distribute is carried out some distortion a little and just constituted (g, h) the be expert at site of half-tone screen code of the right dispersion distribution.What the present invention also represented Fig. 4 (a) is that the spot distribution site is considered as (g, h) the be expert at site of the half-tone screen code that the left side concentrate to distribute, it is the site of AM half-tone screen code, with Fig. 4 (b) expression is that round distribution site is considered as (g, h) the be expert at site of the half-tone screen code that the right disperse to distribute, the i.e. site of FM half-tone screen code.(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. 5, and code " 0 " is represented in the site of the half-tone screen code of the right one row.
Fig. 5 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 belongings 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 both number of different code position between code of distance, k, l=0,1,2 ... m-1.
Fig. 6 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. 5 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. 6 code all.
Fig. 7 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. 5 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. 6.
Fig. 8 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, octagon.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 has two kinds, a kind of is to be arranged in the floating word image of the screen with arbitrary shape that comprises literal by the big pixel of shading, and another kind is to be arranged in the heavy word image shading of the screen with arbitrary shape that comprises literal by the little pixel of shading.
Fig. 9 represents is the pattern that is arranged in the floating word image of the screen with arbitrary shape that comprises literal by shading a little louder, and wherein 101 indications is the big pixel of shading, 102 indications be the little pixel of shading.
Figure 10 represents is the pattern that is arranged in the heavy word image shading of the screen with arbitrary shape that comprises literal by the shading point, and wherein 101 indications is the big pixel of shading, 102 indications be the little pixel of shading.
In order to guarantee to produce the quality of certificate documents, the present invention is when screen coding embedded, be on the gap 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 4 as an example.
Embodiment 1:
Narrate the process of the anti-fake processing method of printing medium certificate documents and copy thereof below in conjunction with Fig. 1 and Fig. 2:
The anti-fake processing method of printing medium certificate documents and copy thereof, form by screen coding embedded system and half-tone screen code recognition system, wherein screen coding embedded system is implemented in the method for imbedding of information in the printing medium certificate documents, and the half-tone screen code recognition system realizes the recognition methods of printing medium certificate documents and information that copy is imbedded thereof.
Screen coding embedded system is installed in the computing machine, by the cooperate gap 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 printer 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.
In printing medium certificate documents information 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 in the gap of certificate documents image and 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 pixel in two kinds of different shading pixels is constituted the arbitrary image that comprises literal simultaneously according to the function of appointment; Under the prerequisite that does not change this shading pixel characteristic, replace with the big pixel of shading the site of the corresponding to half-tone screen code of pixel characteristic that use and shading are big, will have in the screen coding embedded shading image of anti-counterfeiting information simultaneously; In this step, if the site code of the half-tone screen code of imbedding is 1, the pixel that then former shading is big is constant, if the site code of the half-tone screen code of imbedding is 0, then use the big pixel of round distribution site displacement shading, finish imbedding of anti-counterfeiting information half-tone screen code;
(4) the printed images printout that certificate documents image and the shading image of imbedding anti-counterfeiting information are constituted;
Finish above-mentioned imbed process after, represent respectively that by spot distribution site and round distribution site 1 and 0 half-tone screen code is embedded in the shading, its amplification effect as shown in figure 11, wherein 201 the expression be the spot distribution site, 202 the expression be round distribution site.
Figure 12 is with screen coding embedded certificate documents and copy synoptic diagram thereof in floating word shading, wherein Figure 12 (a) is for imbedding the certificate documents of the half-tone screen code with anti-counterfeiting information, because screen coding embedded gap location at certificate documents, 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 12 (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.
Figure 13 is with screen coding embedded certificate documents and copy synoptic diagram thereof in heavy word shading, wherein Figure 13 (a) is for imbedding the certificate documents of the half-tone screen code with anti-counterfeiting information, because screen coding embedded gap location at certificate documents, and the characteristic of the site of half-tone screen code is identical with the characteristic of shading site, and the quality of therefore imbedding the certificate documents behind the half-tone screen code is not affected.Figure 13 (b) is the copy of certificate documents, because certificate documents has heavy word shading image, therefore after duplicating, heavy 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 heavy character segment shading image in addition 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, and occurs COPY or printed words such as invalid as Figure 12 (b) in the behind of proof content.Heavy word function recited above is meant: after having the heavy anti-fraud functional certificate documents of word and being copied, can occur occurring COPY or invalid the grade by the printed words of naughty sky on the shading of its copy as Figure 13 (b).
The principle of work 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 duplicating machine, can constitute literal or pattern with this pixel, and the site of the half-tone screen code of imbedding has been adopted with big pixel characteristic corresponding to spot distribution site and the round distribution 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 duplicating machine.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 12 (a) duplicated on duplicating machine, 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 (COPY) is significantly shown, and promptly floats the word phenomenon.
The principle of work of heavy word: the pixel of pixel that the shading in the shading image of formation certificate documents is little for duplicating, constitute literal or pattern with this pixel, other parts of shading then can be made of by big pixel by the shading that common duplicating machine duplicates another kind, and the site of the half-tone screen code of imbedding has been adopted with big pixel characteristic corresponding to spot distribution site and the round distribution site of shading and replaced; In this case, the literal or the pattern that are made of the little pixel of shading after duplicating are copied out in a kind of mode of being emptied, and constitute the effect of heavy word.Anti-counterfeiting information is retained on the shading image beyond the heavy character segment, and the site of same half-tone screen code is because of big variation takes place in duplicating, and therefore, the anti-counterfeiting information that is retained in after the duplicating on the shading image beyond the heavy character segment also still can be discerned.For example, when Figure 13 (a) duplicated on duplicating machine, the pixel that shading is big and the site of half-tone screen code were retained, and are lost by the word segment that the little pixel of shading constitutes, and present promptly heavy word phenomenon in the mode of being emptied by the pattern (COPY) that the big pixel of shading surrounds.
The half-tone screen code recognition system is installed in the computing machine, can discern the half-tone screen code in printing medium certificate documents and the copy cooperating of equipment with keyboard, display, printer, scanner etc. by main frame.
The recognition methods step of printing medium certificate documents and information that copy is imbedded thereof is as follows:
(1) scanning is embedded with the printing medium certificate documents or the copy of anti-counterfeiting information, generates scan image, and reads in internal memory, and this step is by scanner the printed medium file to be scanned, and forms the process of scan image;
(2) from internal memory, read a pixel of scan image, judge whether this pixel is the site of the half-tone screen code of the information of imbedding in the shading, be then the site of this half-tone screen code to be converted to code value 1 or 0, this step is carried out in circulation, all pixels in the internal memory are all identified, and the site of all half-tone screen codes that will identify converts half-tone screen code to; Because the position of shading in scan image fixed, therefore read the pixel at place, shading position, discern the site of its half-tone screen code, be converted to corresponding code value, all discern until all pixels and finish, finally be converted into half-tone screen code;
(3) half-tone screen code is converted to computer data and show or print, examines this document true or false for the operator.
Because the half-tone screen code that printing medium certificate documents and copy thereof are imbedded all is retained, the method for its identification also is the same.Can at an easy rate the half-tone screen code that is embedded in wherein be identified by above-mentioned steps, and convert thereof into computer data, can or print, examine the true and false of file for operator's contrast this data presentation.
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 2, 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; With the serial number c ∈ C that is arranged in 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.
Embodiment 2:
The anti-fake processing method of printing medium certificate documents and copy thereof can also be made into half-tone screen code information and imbed chip by the method for imbedding with information in the printing medium certificate documents, the half-tone screen code identification chip is made in the recognition methods of printing medium certificate documents and information that copy is imbedded thereof, then these two kinds of chips are connected to the method for imbedding and the recognition methods of the information in the printing medium certificate documents that realizes in duplicating machine or the integral machine, and can make duplicating machine (integrated duplicating machine) have copy-proof function, the trace function, anti-tamper function, the secret writing function, secretly hand down function etc.
Figure 14 is internally connected with above-mentioned half-tone screen code information to imbed chip and half-tone screen code identification chip and be used for compounding machine (integrated duplicating machine) and realize connection diagram of the present invention, and wherein 301 empty frames pointed are the circuit block diagram in the compounding machine.
In printing medium certificate documents information to imbed process as follows: the image of the certificate documents that computing machine will be printed is sent to the RIP image through the I/O interface and divides a version processing module, image after minute version is handled is sent to the half-angle conversion module again, image after the half-angle conversion module is handled is sent to half-tone screen code information and imbeds chip, half-tone screen code information is imbedded anti-counterfeiting information that chip sends certificate documents image and I/O interface section here the form by shading and is embedded in the certificate documents image, and the image that will imbed the certificate documents behind the anti-counterfeiting information is at last delivered to Printer Engine and printed output.
The identifying of printing medium certificate documents and information that copy is imbedded thereof is as follows: the printing medium certificate documents or the copy that will be embedded with anti-counterfeiting information are placed on the enterprising line scanning of scanister, view data after the scanning is delivered in the half-tone screen code identification chip, the half-tone screen code identification chip can identify the anti-counterfeiting information in the view data, the anti-counterfeiting information that identifies can be given computing machine through the I/O interface section and show or handle, and also can deliver to the half-angle conversion module and print output.
Since among the function that half-tone screen code information is imbedded chip and the embodiment 1 in printing medium certificate documents information to imbed method identical, the function of half-tone screen code identification chip is identical with the recognition methods of printing medium certificate documents and information that copy is imbedded thereof, and is not described in detail in this.
Below just provide use compounding machine (integrated duplicating machine) and realized an example application of the present invention, in fact, can carry out the circuit design of wide range of forms with reference to above-mentioned example, the control circuit of sample is whatsoever imbedded the circuit of the anti-fake processing method of printing medium certificate documents that chip and half-tone screen code identification chip finished and copy thereof and is all belonged within the scope of the present invention as long as comprised above-mentioned half-tone screen code information.
Advantageous effect of the present invention is:
1. the present invention can prove that the anti-counterfeiting information of printing medium certificate documents legitimacy is embedded on the printing medium certificate documents with half-tone screen code information, because the half-tone screen code that is embedded in the printing medium certificate documents is hidden, therefore can finely prevent that original paper is forged or is tampered; Adopt simultaneously this method also so that can keep the anti-counterfeiting information of imbedding in the printed medium original paper on the copy, effectively guarantee integrality and the accuracy of half-tone screen code in the copy, can prevent well that also copy is forged or is tampered. Further, also can be encrypted the half-tone screen code of imbedding and decryption processing, more strengthen false proof anti-tamper function, thoroughly solve the social negative effect that the technical development because of printer, duplicator brings.
2. the present invention synthesizes with shading image on the gap of printing medium certificate documents content, and carries out imbedding of half-tone screen code on the basis that does not change shading site character, therefore can guarantee well 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 situation of the precision at printer lower (600dpi), also can produce at copy the effect of floating word or heavy word, avoided using some drawbacks of the special-purpose material existence such as dedicated paper, thereby greatly reduced the cost of manufacture of printing medium certificate documents.
With the printing medium certificate documents of anti-counterfeiting information after duplicating, perhaps heavy word content is shown significantly in the floating word on this copy, therefore can more simply distinguish original paper and copy.
5. because the present invention is on common paper, in printing certificate documents content, print out the shading with antifalse effect, therefore have 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 the authenticity of this copy is guaranteed, so the copy of printing medium certificate documents can be more widely used.
7. content of the present invention can be made special-purpose half-tone screen code information and imbed chip machine half-tone screen code identification chip, and it is installed on compounding machine (integrated duplicator), duplicator, printer or the scanner, realize the false proof anti-tamper effective control method of certificate documents.
Claims (10)
1. the anti-fake processing method of printing medium certificate documents and copy thereof, it is characterized in that: be included in the recognition methods of the method for imbedding and the printing medium certificate documents and the information that copy is imbedded thereof of information in the printing medium certificate documents, wherein in printing medium certificate documents information to imbed method step 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 this anti-counterfeiting information is converted to the half-tone screen code of geometry form or physics form;
(3) make in the gap of certificate documents image constitute by the shading pixel more than one arrange the shading image that forms by several figure repeated combinations, simultaneously on the basis that does not change shading pixel characteristic, use the site of half-tone screen code to replace, will have in the screen coding embedded shading image of anti-counterfeiting information with the shading pixel;
(4) certificate documents image and the printed images that the shading image of imbedding anti-counterfeiting information constitutes are printed output;
The recognition methods step of printing medium certificate documents and information that copy is imbedded thereof is as follows:
(1) scanning is embedded with the printing medium certificate documents or the copy of anti-counterfeiting information, generates scan image, and reads in internal memory;
(2) from internal memory, read a pixel of scan image, if this pixel is the site of the half-tone screen code with geometry form or physics form of the information of imbedding in the shading, the code value that then identifies the site of this half-tone screen code is 1 or 0, this step is carried out in circulation, the site of all half-tone screen codes of the scan image in the internal memory has all been discerned, and the site of all half-tone screen codes that will identify converts half-tone screen code to;
(3) half-tone screen code is converted to computer data code and demonstration or printout.
2. the anti-fake processing method of printing medium certificate documents according to claim 1 and copy thereof, it is characterized in that: 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.
3. the anti-fake processing method of printing medium certificate documents according to claim 1 and copy thereof is characterized in that: the half-tone screen code of described geometry form is made of the site of at least a half-tone screen code that comprises shape, direction, size and location.
4. the anti-fake processing method of printing medium certificate documents according to claim 1 and copy thereof is characterized in that: the half-tone screen code of described physics form is made of the site of at least a half-tone screen code that comprises concentrated dispersion, modulation system, the direction of propagation and mechanics center of gravity.
5. the anti-fake processing method of printing medium certificate documents according to claim 1 and copy thereof is characterized in that: the site of described half-tone screen code comprises that the expression code is the round distribution site of " 0 " for the spot distribution site and the expression code of " 1 ".
6. the anti-fake processing method of printing medium certificate documents according to claim 1 and copy thereof, it is characterized in that: 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.
7. the anti-fake processing method of printing medium certificate documents according to claim 1 and copy thereof is characterized in that: described shading image comprises by the big pixel of shading and is arranged in the floating word image of screen of the arbitrary shape that comprises literal and is arranged in the heavy word image of screen of the arbitrary shape that comprises literal by the little pixel of shading.
8. the anti-fake processing method of printing medium certificate documents according to claim 1 and copy thereof is characterized in that: described shading pixel comprises pixel and the little pixel of shading that shading is big.
9. the anti-fake processing method of printing medium certificate documents according to claim 1 and copy thereof is characterized in that: 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.
10. the anti-fake processing method of printing medium certificate documents according to claim 9 and copy thereof is characterized in that: described trace information comprises printing device type, printing person, time-write interval.
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| CN2006100153731A CN1928916B (en) | 2006-08-21 | 2006-08-21 | Printing medium certificate documents and false proof handling method of copy thereof |
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