CN108898544A - One kind being based on twin-channel grating method for anti-counterfeit - Google Patents
One kind being based on twin-channel grating method for anti-counterfeit Download PDFInfo
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
Abstract
The invention discloses one kind to be based on twin-channel grating method for anti-counterfeit, includes the following steps：(1), Background and encrypted tunnel are selected, the color mode of Background is converted into cmyk color mode, decomposition obtains the image of the image of C-channel, the image in the channel M, the image in the channel Y and K channel；C-channel and the channel M are encrypted tunnel；(2), setting screening parameter carries out screening processing；(3), anti-counterfeiting mark is set in C-channel；(4), anti-counterfeiting mark is set in the channel M；(5), merging treatment obtains the Background for being concealed with anti-counterfeiting mark；(6), it makes matched inspection grating and extracts anti-counterfeiting mark.The present invention has the anti-counterfeiting mark of double layer encryption, and anti-counterfeiting performance, anti-copying and attack tolerant are strong.
Description
Technical field
The invention belongs to print field of anti-counterfeit technology, and in particular to one kind is based on twin-channel grating method for anti-counterfeit.
Background technique
With the fast development of printing technology, fraud confusion is grown thickly, and anti-counterfeiting printing technology has become can not in press
The technological means lacked.The hiding method for anti-counterfeit of graph text information based on halftone screen technology is simple and easy, does not change traditional print
The production equipment and process of brush, and not will increase production cost, it is to develop a kind of relatively more quick method for anti-counterfeit in recent years.It is anti-fake
Hiding for information (such as anti-counterfeiting mark) is realized by offset dot location, after showing hidden (as examined grating) tool superposition accordingly
Anti-counterfeiting information can be shown.
Guo Linghua of Shaanxi Tech Univ et al. exists《Half tone image anti-counterfeiting technology research based on site formula grating》In,
Based on the geometric optical theory that moir patterns are formed, the offset in certain path is carried out to the site of half tone image, is embedded in and is hidden letter
Breath makes corresponding site further according to the matching relationship of site formula decoding grating and the coding grating parameter containing hiding information
Formula decodes grating, extracts hiding information.Hiding information has reached preferable concealment effect in the anti-counterfeiting technology, and superposition is corresponding
After site formula decodes grating, hiding information can clearly show.This technology may be used on printed matter it is anti-fake in, improve printing
The added value of product.Although the initiative site formula decoding grating that realizes of the research extracts hiding information, it is only in monochrome
It hiding information and is extracted in channel, anti-fake parameter is too simple.
《Packaging Engineering》The 5th phase of volume 36《The evaluation of subchannel phase-modulation sub-image method antifalse effect》Research in,
Using halftone screen principle as theoretical basis, a kind of grating method for anti-counterfeit is realized with phase-modulation sub-image technology.Design original image
With sub-image, screening parameter is set to it and carries out digital screening, is respectively embedded into sub-image as anti-fake mother matrix, root in C, M, Y, K channel
According to the difference of screen frequency, the digital raster with the corresponding period is designed, it is laminating complete then to carry out appropriate angle with anti-fake mother matrix
At the extraction of anti-counterfeiting information, obtained experimental result is shown, the extraction effect of sub-image is best in M and C-channel, is anti-fake be applicable in
Channel.But in the research, only using a channel in C, M, Y, K channel as anti-fake mother matrix, the anti-counterfeiting information ratio of insertion
It is more single.
Notification number is that the Chinese invention patent of CN04859329B discloses a kind of anti-fake side of the moir patterns based on linear grating
Invisible graph is embedded on a certain channel through straight line screening, the site screening of other channels routine by method, finally by
The linear grating matched extracts invisible graph.Although invisible graph is only hidden in one and leads to the method achieve Information hiding
On road, attack tolerant is not strong, is reversed a possibility that decoding anti-fake parameter to a certain extent.
To sum up, anti-counterfeiting information or anti-counterfeiting mark is arranged in most of concentrate on of existing research in single channel, and with this
Anti-counterfeiting performance is improved, but there has been no the method for anti-counterfeit of multi-layer security.
Summary of the invention
The object of the present invention is to provide one kind to be based on twin-channel grating method for anti-counterfeit, the anti-counterfeiting label with double layer encryption
Know, concealment is high, anti-copying and attack tolerant is strong.
The present invention provides the following technical solutions：One kind being based on twin-channel grating method for anti-counterfeit, includes the following steps：
The color mode of Background is converted to cmyk color mode by step (1), selection Background, and decomposition obtains C-channel
Image, the channel M image, the image in the channel Y and the image of K channel；C-channel and the channel M are encrypted tunnel；
Step (2), the screen angle that screen frequency and each channel is arranged carry out screening processing, obtain C-channel screening
Figure, the channel M screening figure, the channel Y screening figure and K channel screening figure, screening figure are made of spaced cable, and cable is by justifying
Shape site arranges to be formed, and the screen frequency that the distance between cable is arranged when being handled by screening determines；
Anti-counterfeiting mark is arranged in step (3) in C-channel
Anti-counterfeiting mark is selected, the contour area of anti-counterfeiting mark is obtained on C-channel screening figure, is denoted as A1, calculated according to encryption
Method moves A1Interior site, Encryption Algorithm are：
Wherein, X1For A1Interior site horizontal direction moving distance, Y1For A1Interior site vertical direction moving distance, D are
Spacing between cable, D=25.4/L, unit mm；L is screen frequency, unit lpi；α1For the screen angle of C-channel；A1It is interior
Site it is mobile after, the image of the C-channel encrypted；
Anti-counterfeiting mark is arranged in the channel M in step (4), the image in the channel M encrypted；
Step (5), the encryption for obtaining the image of the C-channel for the encryption that step (3) obtains, step (4) the channel M figure
The channel the Y screening figure and K channel screening figure that picture and step (2) obtain merge, and obtain the Background for being concealed with anti-counterfeiting mark；
Step (6), the matched inspection grating of production, will examine grating to be superimposed on the Background for being concealed with anti-counterfeiting mark
On, extract anti-counterfeiting mark.
It is as above-mentioned technical proposal to further describe：
In the step (4), the method that anti-counterfeiting mark is arranged in the channel M is：
The contour area that anti-counterfeiting mark is obtained on the screening figure of the channel M, is denoted as A2, contour area A1With contour area A2?
Being concealed in the Background of anti-counterfeiting mark for obtaining after merging does not overlap；According to the mobile A of Encryption Algorithm2Interior site, encryption
Algorithm is：
Wherein, X2For A2Interior site horizontal direction moving distance, Y2For A2Interior site vertical direction moving distance, α2For
The screen angle in the channel M；A2After interior site is mobile, the image in the channel M encrypted.
It is as above-mentioned technical proposal to further describe：
The contour area A1Acquisition methods be：
(1), C-channel screening figure is opened in a manner of figure layer in image processing software, is denoted as the first figure layer；
(2), the second figure layer is created, the second figure layer is located above the first figure layer, anti-counterfeiting mark is put into the second figure layer, and
Using select tools, the profile of anti-counterfeiting mark is chosen out；
(3), retain the profile for the anti-counterfeiting mark chosen out, the second figure layer is deleted, at this time in the same position of the first figure layer
Obtain contour area A1；
Contour area A2Acquisition methods be：
(1), the channel M screening figure is reopened in a manner of figure layer in image processing software, is denoted as third figure layer；
(2), the 4th figure layer is created, the 4th figure layer is located above third figure layer, anti-counterfeiting mark is put into third figure layer, and
Using select tools, the profile of anti-counterfeiting mark is chosen out；
(3), retain the profile for the anti-counterfeiting mark chosen out, the 4th figure layer is deleted, at this time in the same position of third figure layer
Obtain contour area A2。
It is as above-mentioned technical proposal to further describe：
The inspection grating is lattice structure and anti-counterfeiting mark can be completely covered, and examining grating is in image processing software
The digital document of the newly-built grayscale mode consistent with the size of Background and input resolution ratio, setting fill color are 20~60%
It coloring in, then carries out screening processing, screen frequency is identical as the screen frequency of Background, and screen angle is 0 ° or 90 °,
The inspection grating is obtained after the completion of screening.
It is as above-mentioned technical proposal to further describe：
In the step (2), when screening processing, the image of C-channel, the image in the channel M, the image in the channel Y and K channel
Image is all made of identical screen frequency and carries out screening, and screen frequency is 72~200lpi.
It is as above-mentioned technical proposal to further describe：
The screen frequency is 96lpi.
It is as above-mentioned technical proposal to further describe：
The α1=0 °, in C-channel be arranged anti-counterfeiting mark when Encryption Algorithm be：
It is as above-mentioned technical proposal to further describe：
The anti-counterfeiting mark is vector graphics or text.
It is as above-mentioned technical proposal to further describe：
The Background is high light or middle tone image.
It is as above-mentioned technical proposal to further describe：
The inspection grating is rectangular configuration and can be completely covered anti-counterfeiting mark, and examining grating is by blackstreak and transparent
Fringe spacing rearranges.
Beneficial effects of the present invention：Anti-counterfeiting mark with double layer encryption, anti-counterfeiting performance, anti-copying and attack tolerant
By force, it is characterized in particular in：
(1), method for anti-counterfeit of the invention may be implemented the insertion of complete anti-counterfeiting mark and extract two processes, anti-
In the insertion of puppet mark, by the way of binary channels encryption, the concealment of anti-counterfeiting mark is improved；During the extraction process, user
It can clearly observe again and extract anti-counterfeiting mark, to differentiate the true and false of product；When examining grating equal nothing at any angle
When method shows the anti-counterfeiting mark at two, illustrates the Background and the product with the Background is to forge；
(2), the setting method of the anti-counterfeiting mark in the present invention, needs to carry out at halftoning before the output for printing based on image
The principle of reason hides anti-counterfeiting mark in halftoning process, due to the hiding mistake for being formed in digital screening output of anti-counterfeiting mark
In journey and the displacement movement based on site, such method for anti-counterfeit, attack tolerant is strong, and adulterator is difficult to decode on four channels
Screen angle and screen frequency, in addition, when adulterator's duplication is concealed with the Background of anti-counterfeiting mark, due in reproduction process
Two screening, original lattice point structure can be made to be destroyed；
(3), the setting method of the anti-counterfeiting mark in the present invention, by the way of double layer encryption, preferably C-channel and the channel M
For encrypted tunnel, anti-counterfeiting mark, and contour area A are respectively provided in the two channels1With contour area A2It obtains after merging
It is concealed in the Background of anti-counterfeiting mark and does not overlap, is i.e. anti-counterfeiting mark on two channels does not overlap, using such side
Formula all has the sub-image of anti-counterfeiting mark in Background on two channels, completed by hiding operation twice, set during being somebody's turn to do
Double anti-forge parameter is set, the difficulty that adulterator decodes anti-fake parameter improves；
(4), anti-counterfeiting mark of the invention during the extraction process, according to the screen angle of corresponding double layer encryption, so that mentioning
It takes there are two angle tools, it is only necessary to which rotating grating can accurately extract anti-counterfeiting mark, operation letter under two corresponding angles
It is single, but ensure that the clarity of extraction.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the grayscale image of the Background in the embodiment of the present invention 1；
Fig. 2 is the grayscale image that the Background of anti-counterfeiting mark is concealed in the embodiment of the present invention 1；
Fig. 3 is the grayscale image of the anti-counterfeiting mark extraction figure in the embodiment of the present invention 1 on C-channel；
Fig. 4 is the grayscale image of the anti-counterfeiting mark extraction figure in the embodiment of the present invention 1 on the channel M；
Fig. 5 is the grayscale image of the Background in the embodiment of the present invention 2；
Fig. 6 is the grayscale image that the Background of anti-counterfeiting mark is concealed in the embodiment of the present invention 2；
Fig. 7 is the grayscale image of the anti-counterfeiting mark extraction figure in the embodiment of the present invention 2 on C-channel；
Fig. 8 is the grayscale image of the anti-counterfeiting mark extraction figure in the embodiment of the present invention 2 on the channel M；
Fig. 9 is the grayscale image of the Background in the embodiment of the present invention 3；
Figure 10 is the grayscale image that the Background of anti-counterfeiting mark is concealed in the embodiment of the present invention 3；
Figure 11 is the grayscale image of the anti-counterfeiting mark extraction figure in the embodiment of the present invention 3 on C-channel；
Figure 12 is the grayscale image of the anti-counterfeiting mark extraction figure in the embodiment of the present invention 3 on the channel M.
Specific embodiment
Present invention will be further explained below with reference to specific examples.These embodiments are merely to illustrate the present invention and do not have to
In limiting the scope of the invention.Now in conjunction with Figure of description, the design feature that the present invention will be described in detail.
Embodiment 1
One kind is provided in the present embodiment 1 based on twin-channel grating method for anti-counterfeit, is included the following steps：
Step (1),
Background is selected, Background is middle tone homogeneous image, (for convenience of display and is understood, Fig. 1 is back as shown in Figure 1
The grayscale image of scape figure), the color mode of Background is converted into cmyk color mode, decomposition obtains image, the channel M of C-channel
Image, the image in the channel Y and the image of K channel；C-channel and the channel M are encrypted tunnel, for hiding in the two channels
Anti-counterfeiting mark, hiding anti-counterfeiting mark human eye not can recognize；
Step (2),
The screen angle of screen frequency and each channel is set, screening processing is carried out；
4 channels are all made of identical screen frequency and carry out screening, screen frequency 96lpi；
45 ° and 75 ° are respectively adopted in the image in the channel Y and the image of K channel；
C-channel screening figure, the channel M screening figure, the channel Y screening figure and K channel screening figure are obtained, screening figure is arranged by interval
The cable of column is constituted, and cable is arranged by circular shaped lattice point and formed, the screening line that the distance between cable is arranged when being handled by screening
Number determines；
Anti-counterfeiting mark is arranged in step (3) in C-channel
Firstly, selecting anti-counterfeiting mark, anti-counterfeiting mark is vector graphics in the present embodiment, is obtained on C-channel screening figure anti-
The contour area of puppet mark, is denoted as A1, A1Acquisition methods be：
(1), C-channel screening figure is opened in a manner of figure layer in image processing software, is denoted as the first figure layer；
(2), the second figure layer is created, the second figure layer is located above the first figure layer, anti-counterfeiting mark is put into the second figure layer, and
Using select tools, the profile of anti-counterfeiting mark is chosen out；
(3), retain the profile for the anti-counterfeiting mark chosen out, the second figure layer is deleted, at this time in the same position of the first figure layer
Obtain contour area A1；
Then, according to the mobile A of Encryption Algorithm1Interior site, Encryption Algorithm are：
In above formula, X1For A1Interior site horizontal direction moving distance, Y1For A1Interior site vertical direction moving distance, D
Spacing between cable, D=25.4/L, unit mm；L is screen frequency above-mentioned；α1For the screen angle of C-channel；This reality
Apply α in example1=0 °, in C-channel be arranged anti-counterfeiting mark when Encryption Algorithm can simplify for：
According to the horizontal and vertical distance of calculating by A1After interior site is mobile, the image of the C-channel encrypted；
Anti-counterfeiting mark is arranged in the channel M in step (4)
Firstly, obtaining the contour area of anti-counterfeiting mark on the screening figure of the channel M, it is denoted as A2；Contour area A1And contour area
A2Being concealed in the Background of anti-counterfeiting mark for obtaining after merging does not overlap, contour area A2Acquisition methods be：
(1), the channel M screening figure is reopened in a manner of figure layer in image processing software, is denoted as third figure layer；
(2), the 4th figure layer is created, the 4th figure layer is located above third figure layer, anti-counterfeiting mark is put into third figure layer, and
Using select tools, the profile of anti-counterfeiting mark is chosen out；
(3), retain the profile for the anti-counterfeiting mark chosen out, the 4th figure layer is deleted, at this time in the same position of third figure layer
Obtain contour area A2；
Then, according to the mobile A of Encryption Algorithm2Interior site, Encryption Algorithm are：
In above formula, X2For A2Interior site horizontal direction moving distance, Y2For A2Interior site vertical direction moving distance, α2
For the screen angle in the channel M；α in the present embodiment2=15 °, Encryption Algorithm when anti-counterfeiting mark being arranged in the channel M can simplify
For：
According to the horizontal and vertical distance of calculating by A2After interior site is mobile, the image in the channel M encrypted；
Step (5),
The image and step in the channel M for the encryption that the image of the C-channel for the encryption that step (3) obtains, step (4) are obtained
Suddenly the channel the Y screening figure and K channel screening figure that (2) obtain merge, and obtain the Background for being concealed with anti-counterfeiting mark.
A kind of extracting method of double layer encryption anti-counterfeiting mark is also provided in the present embodiment 1, is included the following steps：
(1), matched inspection grating is made
Grating is examined to be lattice structure and anti-counterfeiting mark can be completely covered, examining grating is to create in image processing software
The digital document of the grayscale mode consistent with the size of Background and input resolution ratio, setting fill color are filled out for 50%
Then color carries out screening processing, screen frequency is identical as the screen frequency of Background, and screen angle is 0 °, after the completion of screening
To the inspection grating
(2), by the inspection grating of production be superimposed on it is described be concealed on the Background of anti-counterfeiting mark, extract anti-counterfeiting label
Know, is the grayscale image of the anti-counterfeiting mark extraction figure on C-channel referring to Fig. 3, Fig. 3, examines the folder between grating and horizontal line at this time
Angle is 0 °；Referring to fig. 4, Fig. 4 is the grayscale image of the anti-counterfeiting mark extraction figure on the channel M, is examined between grating and horizontal line at this time
Angle be 15 °.
By C-channel screening figure, the channel M screening figure, the channel Y screening figure and the K channel screening figure in the present embodiment 1, obtain
Background Screening Image evaluates Background in embodiment 1 using structural similarity SSIM algorithm and signal-to-noise ratio PSNR algorithm respectively
Screening Image and it is concealed with the similarity of the Background of anti-counterfeiting mark between the two, obtained calculated result is as shown in table 1 below：
1 embodiment of table, 1 anti-counterfeiting mark hides Evaluation results
Wherein, the numerical value of SSIM is between 0 and 1, and when its calculated value is closer to 1, it is more related to represent two images, phase
It is bigger like property；When calculated value is closer to 0, represent that two images are more uncorrelated, and similitude is smaller.The numerical value of PSNR is bigger, generation
Table two images are more related, and similitude is bigger；In the present embodiment 1, the numerical value that the numerical value of SSIM is 0.6482, PSNR is
12.3791, in conjunction with subjective assessment, the anti-counterfeiting mark in available the present embodiment 1 extraordinary can be hidden in Background,
And the clarity extracted is higher.
Embodiment 2
One kind is provided in the present embodiment 2 based on twin-channel grating method for anti-counterfeit, is included the following steps：
Step (1),
Select Background, Background be middle tone and with contrast variation image, as shown in Figure 4 (for convenience of display with
Understand, Fig. 4 is the grayscale image of Background, and the texture structure of Background is mainly presented in Fig. 4), the color mode of Background is converted
For cmyk color mode, decomposition obtains the image of the image of C-channel, the image in the channel M, the image in the channel Y and K channel；C-channel
It is encrypted tunnel with the channel M；
Step (2),
The screen angle of screen frequency and each channel is set, screening processing is carried out；
4 channels are all made of identical screen frequency and carry out screening, screen frequency 169lpi；
45 ° and 71.57 ° are respectively adopted in the image in the channel Y and the image of K channel；
C-channel screening figure, the channel M screening figure, the channel Y screening figure and K channel screening figure are obtained, screening figure is arranged by interval
The cable of column is constituted, and cable is arranged by circular shaped lattice point and formed, the screening line that the distance between cable is arranged when being handled by screening
Number determines；
Anti-counterfeiting mark is arranged in step (3) in C-channel
Firstly, selection anti-counterfeiting mark, anti-counterfeiting mark is the combination of text and vector graphics in the present embodiment, in C-channel plus
The contour area that anti-counterfeiting mark is obtained on net figure, is denoted as A1, A1Acquisition methods be：
(1), C-channel screening figure is opened in a manner of figure layer in image processing software, is denoted as the first figure layer；
(2), the second figure layer is created, the second figure layer is located above the first figure layer, anti-counterfeiting mark is put into the second figure layer, and
Using select tools, the profile of anti-counterfeiting mark is chosen out；
(3), retain the profile for the anti-counterfeiting mark chosen out, the second figure layer is deleted, at this time in the same position of the first figure layer
Obtain contour area A1；
Then, according to the mobile A of Encryption Algorithm1Interior site, Encryption Algorithm are：
In above formula, X1For A1Interior site horizontal direction moving distance, Y1For A1Interior site vertical direction moving distance, D
Spacing between cable, D=25.4/L, unit mm；L is screen frequency above-mentioned；α1For the screen angle of C-channel；This reality
Apply α in example1=15 °, in C-channel be arranged anti-counterfeiting mark when Encryption Algorithm can simplify for：
According to the horizontal and vertical distance of calculating by A1After interior site is mobile, the image of the C-channel encrypted；
Anti-counterfeiting mark is arranged in the channel M in step (4)
Firstly, obtaining the contour area of anti-counterfeiting mark on the screening figure of the channel M, it is denoted as A2；Contour area A1And contour area
A2Being concealed in the Background of anti-counterfeiting mark for obtaining after merging does not overlap, contour area A2Acquisition methods be：
(1), the channel M screening figure is reopened in a manner of figure layer in image processing software, is denoted as third figure layer；
(2), the 4th figure layer is created, the 4th figure layer is located above third figure layer, anti-counterfeiting mark is put into third figure layer, and
Using select tools, the profile of anti-counterfeiting mark is chosen out；
(3), retain the profile for the anti-counterfeiting mark chosen out, the 4th figure layer is deleted, at this time in the same position of third figure layer
Obtain contour area A2；
Then, according to the mobile A of Encryption Algorithm2Interior site, Encryption Algorithm are：
In above formula, X2For A2Interior site horizontal direction moving distance, Y2For A2Interior site vertical direction moving distance, α2
For the screen angle in the channel M；α in the present embodiment2=0 °, Encryption Algorithm when anti-counterfeiting mark being arranged in the channel M can simplify
For：
According to the horizontal and vertical distance of calculating by A2After interior site is mobile, the image in the channel M encrypted；
Step (5),
The image and step in the channel M for the encryption that the image of the C-channel for the encryption that step (3) obtains, step (4) are obtained
Suddenly the channel the Y screening figure and K channel screening figure that (2) obtain merge, and obtain the Background for being concealed with anti-counterfeiting mark.
A kind of extracting method of double layer encryption anti-counterfeiting mark is also provided in the present embodiment 2, is included the following steps：
(1), matched inspection grating is made
It examines grating to be rectangular configuration and anti-counterfeiting mark can be completely covered, examines grating for by blackstreak and transparent stripe
It is alternatively arranged composition；
(2), by the inspection grating of production be superimposed on it is described be concealed on the Background of anti-counterfeiting mark, extract anti-counterfeiting label
Know.
It is the grayscale image of the anti-counterfeiting mark extraction figure in the present embodiment 2 on C-channel referring to Fig. 7, Fig. 7, examines grating at this time
Angle between horizontal line is 15 °；It is the gray scale of the anti-counterfeiting mark extraction figure in the present embodiment 2 on the channel M referring to Fig. 8, Fig. 8
Figure, examining the angle between grating and horizontal line at this time is 0 °.
By C-channel screening figure, the channel M screening figure, the channel Y screening figure and the K channel screening figure in the present embodiment 2, obtain
Background Screening Image evaluates Background in embodiment 2 using structural similarity SSIM algorithm and signal-to-noise ratio PSNR algorithm respectively
Screening Image and it is concealed with the similarity of the Background of anti-counterfeiting mark between the two, obtained calculated result is as shown in table 2 below：
2 embodiment of table, 2 anti-counterfeiting mark hides Evaluation results
Wherein, the numerical value of SSIM is between 0 and 1, and when its calculated value is closer to 1, it is more related to represent two images, phase
It is bigger like property；When calculated value is closer to 0, represent that two images are more uncorrelated, and similitude is smaller.The numerical value of PSNR is bigger, generation
Table two images are more related, and similitude is bigger；In the present embodiment 2, the numerical value that the numerical value of SSIM is 0.7022, PSNR is
12.9716, in conjunction with subjective assessment, the anti-counterfeiting mark in available the present embodiment 2 extraordinary can be hidden in Background,
And the clarity extracted is higher.
Embodiment 3
In the present embodiment 3 on the basis of embodiment 2, following difference is made：Different Backgrounds has been selected as shown in Figure 9
And different anti-counterfeiting marks is concealed, remaining parameter is identical.
By C-channel screening figure, the channel M screening figure, the channel Y screening figure and the K channel screening figure in the present embodiment 3, obtain
Background Screening Image evaluates Background in embodiment 3 using structural similarity SSIM algorithm and signal-to-noise ratio PSNR algorithm respectively
Screening Image and it is concealed with the similarity of the Background of anti-counterfeiting mark between the two, obtained calculated result is as shown in table 3 below：
3 embodiment of table, 3 anti-counterfeiting mark hides Evaluation results
Wherein, the numerical value of SSIM is between 0 and 1, and when its calculated value is closer to 1, it is more related to represent two images, phase
It is bigger like property；When calculated value is closer to 0, represent that two images are more uncorrelated, and similitude is smaller.The numerical value of PSNR is bigger, generation
Table two images are more related, and similitude is bigger；In the present embodiment 3, the numerical value that the numerical value of SSIM is 0.6985, PSNR is
12.3246, in conjunction with subjective assessment, the anti-counterfeiting mark in available the present embodiment 3 extraordinary can be hidden in Background,
And the clarity extracted is higher.
It should be noted that Fig. 2, Fig. 3, Fig. 4, Fig. 6, Fig. 7, Fig. 8, Figure 10, Figure 11, Figure 12 mentioned by Examples 1 to 3
It for half-tone picture well known in the art (filtering colour information), is made of site, is the image of discretization, these images are
Print before figure to be output, can accurately react original copy contrast variation, specifically, Fig. 3, Fig. 4, Fig. 7, Fig. 8, Figure 11,
Figure 12 is the half-tone picture for covering grating, these attached drawings are that clearly, and Fig. 1, Fig. 5 and Fig. 9 are then another form of continuous
It changes the line map picture, works in print field for preamble.
Claims (10)
1. one kind is based on twin-channel grating method for anti-counterfeit, it is characterised in that：Include the following steps：
The color mode of Background is converted to cmyk color mode by step (1), selection Background, and decomposition obtains the figure of C-channel
Picture, the image in the channel M, the image in the channel Y and K channel image；C-channel and the channel M are encrypted tunnel；
Step (2), the screen angle that screen frequency and each channel is arranged carry out screening processing, it is logical to obtain C-channel screening figure, M
Road screening figure, the channel Y screening figure and K channel screening figure, screening figure are made of spaced cable, and cable is by circular shaped lattice point
Arrangement is formed, and the screen frequency that the distance between cable is arranged when being handled by screening determines；
Anti-counterfeiting mark is arranged in step (3) in C-channel
Anti-counterfeiting mark is selected, the contour area of anti-counterfeiting mark is obtained on C-channel screening figure, is denoted as A1, mobile according to Encryption Algorithm
A1Interior site, Encryption Algorithm are：
Wherein, X1For A1Interior site horizontal direction moving distance, Y1For A1Interior site vertical direction moving distance, D is cable
Between spacing, D=25.4/L, unit mm；L is screen frequency, unit lpi；α1For the screen angle of C-channel；A1Interior net
After point is mobile, the image of the C-channel encrypted；
Anti-counterfeiting mark is arranged in the channel M in step (4), the image in the channel M encrypted；
Step (5), the encryption for obtaining the image of the C-channel for the encryption that step (3) obtains, step (4) the channel M image with
And the obtained channel the Y screening figure of step (2) and K channel screening figure merge, and obtain the Background for being concealed with anti-counterfeiting mark；
Step (6), the matched inspection grating of production, will examine grating be superimposed on it is described be concealed on the Background of anti-counterfeiting mark,
Extract anti-counterfeiting mark.
2. according to claim 1 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：In the step (4),
The method of setting anti-counterfeiting mark is in the channel M：
The contour area that anti-counterfeiting mark is obtained on the screening figure of the channel M, is denoted as A2, contour area A1With contour area A2Merging
Being concealed in the Background of anti-counterfeiting mark for obtaining afterwards does not overlap；According to the mobile A of Encryption Algorithm2Interior site, Encryption Algorithm
For：
Wherein, X2For A2Interior site horizontal direction moving distance, Y2For A2Interior site vertical direction moving distance, α2It is logical for M
The screen angle in road；A2After interior site is mobile, the image in the channel M encrypted.
3. according to claim 2 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：The contour area A1's
Acquisition methods are：
(1), C-channel screening figure is opened in a manner of figure layer in image processing software, is denoted as the first figure layer；
(2), the second figure layer is created, the second figure layer is located above the first figure layer, anti-counterfeiting mark is put into the second figure layer, and use
Select tools choose out the profile of anti-counterfeiting mark；
(3), retain the profile for the anti-counterfeiting mark chosen out, delete the second figure layer, obtained at this time in the same position of the first figure layer
Contour area A1；
Contour area A2Acquisition methods be：
(1), the channel M screening figure is reopened in a manner of figure layer in image processing software, is denoted as third figure layer；
(2), the 4th figure layer is created, the 4th figure layer is located above third figure layer, anti-counterfeiting mark is put into third figure layer, and use
Select tools choose out the profile of anti-counterfeiting mark；
(3), retain the profile for the anti-counterfeiting mark chosen out, delete the 4th figure layer, obtained at this time in the same position of third figure layer
Contour area A2。
4. according to claim 1 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：The inspection grating is point
Structure and anti-counterfeiting mark can be completely covered in battle array, and examining grating is the size and input created in image processing software with Background
The digital document of the consistent grayscale mode of resolution ratio, setting fill color color in for 20~60%, then carry out at screening
Reason, screen frequency is identical as the screen frequency of Background, and screen angle is 0 ° or 90 °, and the inspection is obtained after the completion of screening
Grating.
5. according to claim 1 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：In the step (2), add
When net processing, the image of C-channel, the image in the channel M, the image in the channel Y and K channel image be all made of identical screen frequency
Screening is carried out, screen frequency is 72~200lpi.
6. according to claim 5 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：The screen frequency is
96lpi。
7. according to claim 1 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：The α1It is=0 °, logical in C
In road be arranged anti-counterfeiting mark when Encryption Algorithm be：
8. according to claim 1 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：The anti-counterfeiting mark is arrow
Spirogram shape or text.
9. according to claim 1 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：The Background is high light
Or middle tone image.
10. according to claim 1 be based on twin-channel grating method for anti-counterfeit, it is characterised in that：The inspection grating is
Rectangular configuration and anti-counterfeiting mark can be completely covered, examining grating is to be alternatively arranged to form by blackstreak and transparent stripe.
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| CN201810801997.9A CN108898544A (en) | 2018-07-20 | 2018-07-20 | One kind being based on twin-channel grating method for anti-counterfeit |
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|---|---|---|---|---|
| CN113905237A (en) * | 2021-08-23 | 2022-01-07 | 中山大学 | Double-channel encryption pixel structure design method |
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| US20060170974A1 (en) * | 2005-01-28 | 2006-08-03 | Hsi-Chun Wang | Method of watermark with hybrid halftone dots |
| CN103996166A (en) * | 2014-06-05 | 2014-08-20 | 上海理工大学 | Holographic anti-counterfeiting algorithm based on shape of screen dot |
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| 王天马: "分通道相位调制潜像法防伪效果的评价", 《包装工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113905237A (en) * | 2021-08-23 | 2022-01-07 | 中山大学 | Double-channel encryption pixel structure design method |
| CN113905237B (en) * | 2021-08-23 | 2023-03-14 | 中山大学 | Double-channel encryption pixel structure design method |
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Application publication date: 20181127 |