CN101022499A - Method for abstracting graph and text infromation utilizing half-hue image networking hiding - Google Patents
Method for abstracting graph and text infromation utilizing half-hue image networking hiding Download PDFInfo
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Abstract
A method of utilizing halftone to hide and to pick up alphaphotographic information includes hiding alphaphotographic information effectively in printed manuscript at printing process and simultaneously enabling to use printing film prepared by present invention to easily pick up false proof information hidden in said printed manuscript.
Description
Technical field
The half tone image that the invention belongs in the image hard copy field is handled the method for anti-counterfeit field, is specifically related to a kind of method of utilizing the half tone image linked network to hide and extract graph text information.
Background technology
Anti-counterfeiting technology develops into today, become one considerable and increase industry rapidly, concrete method, technology and product are innumerable.Current main anti-counterfeiting technology has: laser antifalsification technology, biological anti-counterfeiting technology, nuclear track anti-counterfeit technology, package anti-counterfeiting technology and inquiry recognition category anti-counterfeiting technology or the like.Anti-counterfeiting technology is numerous, no matter but adopting which kind of anti-counterfeiting technology, numeric type and analogue type are two kinds nothing more than.
So-called numeric type anti-counterfeiting technology mainly is meant in the binary digit electronic graph-text hides graph text information by certain cryptographic means, simultaneously can pass through specific decrypted program scanning digital image, thereby read out the anti-counterfeiting technology a kind of commonly used of hiding graph text information.This technology is arranged by the binary data of original image being made specific coding, makes and can't distinguish out hiding graph text information by human eye in original image.Because the complexity of binary picture data coding need a large amount of calculating tests for analyzing the deciphering hiding data, so this kind technology has security feature preferably.But this technology also has certain limitation, and its anti-counterfeit recognition must convert binary DID to, obtain hiding information wherein by analyzing its binary coding, so its actual effect is short of to some extent.Digital coding can obtain its encoding law by a large amount of calculations after all simultaneously, so also there is bigger leak in the false proof reliability of this method.
Analogue type anti-counterfeiting technology and numeric type anti-counterfeiting technology are a kind of anti-counterfeiting technologies that opposes fully, its security feature is embodied on the physical medium fully, the picture and text that physical medium presented are the same with normal information, but portion has hidden some graph text informations by certain technology within it, and the extraction of this information is divided into direct type and indirect-type.So-called direct type is the mode by the visual physical medium of human eye, and commonly angle promptly changes the visual angle and tells hiding graph text information, is common in the technology such as antiforge laser holographic.It mainly is by using specific instrument to analyze hiding graph text information as the key of unblanking, being common in technology such as package anti-counterfeiting that indirect-type is extracted.The false proof advantage of analogue type is that its antifalsification is stronger, not transreplication and forgery, but shortcoming is that its cost of manufacture is higher, needs special material and extraordinary manufacture method, can not be the best way for the false proof user of low side therefore.
Now, owing to the continuous expansion of press at industry-by-industry, most physical medium all is embodied in printing original text or hard copy, so anti-counterfeiting technology becomes the inexorable trend that anti-counterfeiting technology develops with combining of printing technology.And the fusion of halftoning screening technology in the printing technology and anti-counterfeiting technology becomes an emerging anti-counterfeiting technology.
Conventional plate making halftoning screening technology comprises amplitude modulation screening and frequency-modulation screening, wherein amplitude modulation screening mainly is to come reproduced image original copy level by the network point size, and frequency-modulation screening is to come reproduced image original copy level apart from density by controlling between fixed-size site.
The site generation method that is based on threshold matrix that the amplitude modulation screening plate-making technology of hectographic printing adopts is at the computer realm orderly dither method of accumulation point (clustered dot ordereddithering) that is otherwise known as.It acts on the hard copy device (as: laser printer, electronic printing platemaking equipment) of image, and the colored spots on its recording medium is aggregated into specific shape (as: circular, square).By controlling the area of these shapes, produce required density of image, reach the purpose of duplicating density continually varying image.
The core threshold matrix of halftoning linked network is a rectangle or rectangular numerical matrix, and the value of matrix element has wherein determined the shape and the arrangement of site, and threshold matrix element value is just good as calculated before the halftoning linked network.In the process of linked network, the brightness value for the treatment of the linked network image pixel is used to compare with the numerical value of the corresponding matrix element of threshold matrix, the result who obtains (greater than/less than) be used to determine whether the relevant position of forme should be exposed, in the implementation of linked network algorithm, threshold matrix is arranged in the coordinate space of the output space of a whole page in length and breadth, decides the corresponding relation of layout position and threshold matrix element with this.
Along with further developing of anti-counterfeiting technology, increasing technology begins to pay close attention to how the numeric type anti-counterfeiting technology is carried out organic the combination with the analogue type anti-counterfeiting technology, thereby develops the anti-counterfeiting technology that mixed type.Yet the analogue type anti-counterfeiting technology be applied in the reproduction that needs to rely on carrier to a great extent, and nowadays, most carriers are embodied on printed matter or the printed product, have created certain theoretical foundation for the analogue type anti-counterfeiting technology with combining of printing technology like this.On the other hand, traditional printing core technology halftoning electronics screening technology is again typical numeric type handling process, the two-value dot array data of its output outputs to through hard copy device on the physical medium such as paper, thereby, anti-counterfeiting technology and printing halftoning screening technology combine and embody the false proof characteristics of numeric type.
As seen from the above analysis, the halftoning screening technology can be good at the numeric type in the anti-counterfeiting technology false proof with analogue type is false proof organically combines as a kind of bridge, thus performance strong point separately.Therefore thereby in the halftoning screening technology, how to accomplish to hide graph text information and can conveniently extract the effect that reaches false proof more and more become screening technology problem to be solved is arranged.
Summary of the invention
At the defective that exists in the prior art, the purpose of this invention is to provide a kind of method of utilizing the half tone image linked network to hide and extract graph text information.This method can be hidden graph text information and correct output (printing in the two-value dot matrix after the halftoning linked network, print), can guarantee in printing original text or hard copy, to utilize the correct graph text information of hiding that reproduces of the film of unblanking, and guaranteed by duplicating, can't extract hiding graph text information once more after the copy functions such as scanning, thereby reach false proof final purpose.
For reaching above purpose, the technical solution used in the present invention is: a kind of method for anti-counterfeit that utilizes the half tone image linked network to hide graph text information, and its specific implementation is as follows:
Step 1: the graph text information m according to given needs are hidden, the data of graph text information m are done the contrast adjustment, generate the profile matrix M that hides Info, its processing method is as follows:
Wherein: M
(i, j)Be stain (i, j) brightness value after the processing.
m
(i, j)Be that (i j) handles preceding brightness value to stain.
Step 2: set the profile matrix M that hides Info at four chromogen manuscript bases as S
kIn the position coordinates area B, given four look halftoning linked network threshold matrix T simultaneously
k: comprised the net type, net angle α (being the linked network angle), mesh is counted linked network information such as F, and wherein k represents four look version sequence numbers, and meaning is:
K=1 represents blue or green version
K=2 represents pinkish red version
K=3 represents yellow version
K=4 represents black print
According to the form and aspect weight of four look printing inks, set the false proof mother matrix of the more shallow look version of form and aspect as the profile matrix M that hides Info, it is as follows to choose false proof mother matrix priority:
Blue or green version＞magenta version＞black print＞Huang version,
It is the preferably blue or green version of false proof mother matrix.
Step 3: the half tone image linked network, with four chromogen manuscript bases as S
kRespectively with four look halftoning linked network threshold matrix T
kIn corresponding threshold value compare, its operation method is as follows:
Wherein:
B (i, j) be stain (value is 1 or 0 for i, j) the dyeing data of output halftoning one site battle array,
T=T
k, the value of k is 1,2,3 or 4,
u＝imod?L，
v＝jmod?L，
(x, y) ∈ [0,1] are that four chromogen manuscript bases are as S to I
kMiddle coordinate (x, brightness y),
L is threshold matrix T
kWide high size;
Step 4: when the halftoning linked network is handled false proof mother matrix, adopt the dynamically changeable net hanging method, its principle is as follows:
u＝imodL+x
k
v＝jmodL+y
k
Wherein, x
kExpression threshold matrix T
kAlong the side-play amount of x direction,
y
kExpression threshold matrix T
kAlong the side-play amount of y direction,
x
kWith y
kNeed to satisfy following conditional relationship:
α＝arctan(x
k/y
k)
α=| α-α ' | and α＜0.5 degree, wherein α is the net angle,
The dynamic value of its threshold value T is as follows:
Step 5: according to result relatively, determine stain (whether i j) is colored:
If B (i, j)=1, stain (i j) is colored,
If (i, j)=0, (i j) is not colored stain B.
A kind of method of utilizing the half tone image linked network to extract aforesaid hiding graph text information is according to the employed threshold matrix T of false proof mother matrix in the halftoning linked network
kMesh count F, in actual print under the resolution of output equipment, it is constant to keep mesh to count F, the lithographic film of output gray level value G fixed size, this lithographic film is hidden in the instrument key of the graph text information in the printing mother matrix as extraction, wherein the span of G value can be chosen in the intermediate grey values scope, and the extracting method that hides Info is as follows:
Site angle in the lithographic film is placed under the situation with the net angle α convergence of antiforge mother matrix, by the grating interference principle, produce interference effect, different according to the interference texture of net angle α different in the step 4 and α ' generation rely on the contrast effect of texture to reproduce the graph text information of being hidden.
Effect of the present invention is: use method provided by the invention, can effectively graph text information be hidden in actual print or print procedure in printing original text or the printing contribution, be difficult for being found.The lithographic film that utilizes method of the present invention to make simultaneously can extract the anti-counterfeiting information of hiding in printing original text or the hard copy easily under the lower situation of relative cost.Method for anti-counterfeit of the present invention can make printing original text or hard copy through duplicating or traditional duplicate copy operation such as scanning after, guaranteeing hides Info all loses, thereby provides conveniently recognition methods for false proof department identifies the true and false of contribution.
Description of drawings
Fig. 1 uses the schematic diagram that the halftoning linked network realizes that graph text information is hidden;
Fig. 2 needs hiding image information schematic diagram;
Fig. 3 is a dot matrix sample schematic diagram after the false proof linked network of halftoning;
Fig. 4 is the grating schematic diagram that anti-counterfeiting information extracts key.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
In the present embodiment, given version threshold matrix parameter of all kinds is as follows:
Blue or green version: α=90+arctan (33/56)=120.51 degree, the wide high size L=208 of matrix, linear site
Product version: α=90-arctan (33/56)=59.49 degree, the wide high size L=208 of matrix, linear site
Yellow version: α=120+arctan (33/56)=150.51 degree, the wide high size L=208 of matrix, linear site
Black print: α=arctan (33/56)=30.51 degree, the wide high size L=208 of matrix, linear site.
Version mesh number wherein of all kinds is 187.5 line/inches.
As shown in Figure 1, (i, j) the stain position of expression on the recording medium, (x, the y) coordinate figure in the expression original image corresponding, (u, v) expression and its corresponding threshold matrix element with it.
A kind of method of utilizing the half tone image linked network to hide and extract graph text information, its specific implementation may further comprise the steps:
Step 1: according to the graph text information m that given needs are hidden, m does the contrast adjustment with the graph text information data, generates the profile matrix M that hides Info, and its processing method is as follows:
Wherein:
M
(i, j)Be stain (i, the j) brightness value after handling,
m
(i, j)Be stain (i, the j) brightness value before handling,
In this example, the image array that hides Info can be with reference to legend 2.
Step 2: set the profile matrix M that hides Info at four chromogen manuscript bases as S
kIn position coordinates area B (determining) by the user, given four look halftoning linked network threshold matrix T simultaneously
k: comprised the net type, net angle α, mesh is counted linked network information such as F, and wherein k represents four look version sequence numbers, and meaning is:
K=1 represents blue or green version
K=2 represents pinkish red version
K=3 represents yellow version
K=4 represents black print
According to the form and aspect weight of four look printing inks, set the false proof mother matrix of the more shallow look version of form and aspect as the profile matrix M that hides Info, it is as follows to choose false proof mother matrix priority:
Blue or green version＞magenta version＞black print＞Huang version
In the present embodiment, choose the mother matrix of blue or green version for hiding Info.
Step 3: the half tone image linked network, with four chromogen manuscript bases as S
kIn coordinate (x, brightness y) respectively with four look halftoning linked network threshold matrix T
kIn corresponding threshold value T (u, v) compare with determine stain on the corresponding recording medium (i, dyeing data j) are dye number, its operation method is as follows:
Wherein:
B (i, j) be stain (i, j) the dyeing data of output halftoning one site battle array,
T＝T
k，
u＝imod?L，
v＝jmod?L，
(x, y) ∈ [0,1] are that four chromogen manuscript bases are as S to I
kMiddle coordinate (x, brightness y),
L is threshold matrix T
kWide high size,
According to the given threshold matrix parameter in front, L=208
Step 4: when the halftoning linked network is handled false proof mother matrix, adopt the dynamically changeable net hanging method, its principle is as follows:
u＝imodL+x
k
v＝jmodL+y
k
Wherein, x
kExpression threshold matrix T
kAlong the side-play amount of x direction,
y
kExpression threshold matrix T
kAlong the side-play amount of y direction, x
kWith y
kNeed to satisfy following conditional relationship:
α′＝arctan(x
k/y
k)
α=| α-α ' | and α＜0.5 degree, wherein α is the net angle,
In concrete the enforcement, x
k=34, y
k=57, can calculate thus
α=| 30.51-30.815|=0.305＜0.5 degree
The dynamic value of its threshold value T is as follows:
Above principle can be with reference to figure 1.
Step 5: according to result relatively, determine stain (whether i j) is colored:
If B (i, j)=1, stain (i j) is colored,
If (i, j)=0, (i j) is not colored stain B.
Design sketch can be with reference to figure 3 after the actual halftone process.
Step 6: the false proof extraction that hides Info, according to the employed threshold matrix T of false proof mother matrix in the halftoning linked network
kMesh count F, in actual print under the resolution of output equipment, it is constant to keep mesh to count F, the lithographic film of output gray level value G fixed size, this lithographic film is hidden in the instrument key of the graph text information in the printing mother matrix as extraction, wherein the span of G value can be chosen in the intermediate grey values scope, and the extracting method that hides Info is as follows:
Site angle in the lithographic film is placed under the situation with the net angle α convergence (being basically identical) of antiforge mother matrix, by the grating interference principle, produce interference effect, different according to the interference texture of net angle α different in the step 4 and α ' generation rely on the contrast effect of texture to reproduce the graph text information of being hidden.
In this example, the G value is decided to be 30%, and its raster effects can be with reference to figure 4.
According to the foregoing description, in conjunction with the hiding schematic diagram of application halftoning linked network realization graph text information as shown in Figure 1, the present invention is directed to anti-counterfeiting technology as can be seen and print the demand in field at printing and desktop, on the basis of halftoning screening technology, adopt the dynamically changeable screening technology, in conjunction with principle of optical interference, solved and hidden graph text information and correct output (printing in the two-value dot matrix after the halftoning linked network, print), can guarantee in printing original text or hard copy, to utilize the correct graph text information of hiding that reproduces of the film of unblanking, and guaranteed by duplicating, can't extract hiding graph text information once more after the copy functions such as scanning, thereby reach false proof final purpose.
Method of the present invention is not limited to the embodiment described in the embodiment, and those skilled in the art's technical scheme according to the present invention draws other execution mode, belongs to technological innovation scope of the present invention equally.
Claims (6)
1. method of utilizing the half tone image linked network to hide graph text information may further comprise the steps:
(1) the graph text information m that hides according to given needs does the contrast adjustment with the data of graph text information m, generates the profile matrix M that hides Info;
(2) set the profile matrix M that hides Info at four chromogen manuscript bases as S
kIn the position coordinates area B, given four look halftoning linked network threshold matrix T simultaneously
k, wherein k represents four look version sequence numbers, and value is 1,2,3,4, represents blue or green version, pinkish red version, yellow version, black print respectively;
(3) half tone image linked network, with four chromogen manuscript bases as S
kRespectively with four look halftoning linked network threshold matrix Tk in corresponding threshold value compare, its operation method is as follows:
Wherein:
B (i, j) be stain (value is 1 or 0 for i, j) the dyeing data of output halftoning one site battle array,
T=T
k, k is 1,2,3 or 4,
u＝imodL，
v＝jmodL，
(x, y) ∈ [0,1] are that four chromogen manuscript bases are as S to I
kMiddle coordinate (x, brightness y),
L is threshold matrix T
kWide high size;
(4) when the halftoning linked network is handled false proof mother matrix, adopt the dynamically changeable net hanging method, its principle is as follows:
u＝imodL+x
k
v＝jmodL+y
k
Wherein, x
kExpression threshold matrix T
kAlong the side-play amount of x direction,
y
kExpression threshold matrix T
kAlong the side-play amount of y direction,
x
kWith y
kNeed to satisfy following conditional relationship:
α′＝arctan(x
k/y
k)
α=| α-α ' | and α＜0.5 degree, wherein α is the net angle, the dynamic value of its threshold value T is as follows:
(5) according to relatively result, determine stain (whether i j) is colored:
If B (i, j)=1, stain (i j) is colored,
If (i, j)=0, (i j) is not colored stain B.
2. a kind of method of utilizing the half tone image linked network to hide graph text information as claimed in claim 1 is characterized in that: in the step (1), the concrete grammar that generates the profile matrix M that hides Info is as follows:
Wherein: M
(i, j)Be stain (i, the j) brightness value after handling,
m
(i, j)Be that (i j) handles preceding brightness value to stain.
3. a kind of method of utilizing the half tone image linked network to hide graph text information as claimed in claim 1 is characterized in that: described threshold matrix T
kLinked network packets of information purse rope type, net angle α, mesh count F.
4. a kind of method for anti-counterfeit that utilizes the half tone image linked network to hide graph text information as claimed in claim 3, it is characterized in that: according to the form and aspect weight of four look printing inks, set the false proof mother matrix of the more shallow look version of form and aspect as the profile matrix M that hides Info, it is as follows to choose false proof mother matrix priority: blue or green version＞magenta version＞black print＞Huang version.
5. a kind of method of utilizing the half tone image linked network to hide graph text information as claimed in claim 4 is characterized in that: choose the false proof mother matrix of blue or green version for the profile matrix M that hides Info.
6. a method of utilizing the half tone image linked network to extract hiding graph text information as claimed in claim 1 is characterized in that: according to the employed threshold matrix T of false proof mother matrix in the halftoning linked network
kMesh count F, in actual print under the resolution of output equipment, it is constant to keep mesh to count F, the lithographic film of output gray level value G fixed size, this lithographic film is hidden in the instrument key of the graph text information in the printing mother matrix as extraction, wherein the span of G value is chosen in the intermediate grey values scope, and the extracting method that hides Info is as follows:
Site angle in the lithographic film is placed under the situation with the net angle α convergence of antiforge mother matrix, by the grating interference principle, produce interference effect, different according to the interference texture of different net angle α and α ' generations, the graph text information that the contrast effect reproduction of dependence texture is hidden.
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| CN107578079A (en) * | 2017-09-18 | 2018-01-12 | 臧戈平 | A kind of method for anti-counterfeit that high-fidelity is carried out in information code region and hides figure |
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| CN113177517A (en) * | 2021-05-24 | 2021-07-27 | 艾斯芸防伪科技(福建)有限公司 | Method for unlocking anti-counterfeiting hidden image in printed matter based on intelligent mobile equipment |
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