CN108961143A - A kind of grating application method with anti-copying function - Google Patents
A kind of grating application method with anti-copying function Download PDFInfo
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- CN108961143A CN108961143A CN201810812271.5A CN201810812271A CN108961143A CN 108961143 A CN108961143 A CN 108961143A CN 201810812271 A CN201810812271 A CN 201810812271A CN 108961143 A CN108961143 A CN 108961143A
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- 238000012216 screening Methods 0.000 claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 claims abstract description 26
- 239000000284 extract Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000003780 insertion Methods 0.000 claims abstract description 7
- 230000037431 insertion Effects 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims description 26
- 238000012545 processing Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2201/00—General purpose image data processing
- G06T2201/005—Image watermarking
- G06T2201/0065—Extraction of an embedded watermark; Reliable detection
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Abstract
The invention discloses a kind of grating application method with anti-copying function, it is related to printing field of anti-counterfeit technology, comprising the following steps: step (1), selection source images and anti-counterfeiting mark；Step (2), screening；Step (3) calculates displacement；Step (4), insertion anti-counterfeiting mark；Step (5), production identification grating；Step (6) extracts anti-counterfeiting mark.The present invention uses the identification grating of anti-copying, has stronger anti-fake reliability in the Application in Anti-counterfeiting of shadow image.
Description
Technical field
The invention belongs to print field of anti-counterfeit technology, and in particular to a kind of grating application method with anti-copying function.
Background technique
With the continuous development of modern printing industry, advanced printing equipment and copier are widely used.This
In the case of, some criminals utilize high accuracy prints equipment, are sought by means such as the trade mark of forgery expensive goods and outer packings
Take great number interests.In order to resist the phenomenon that counterfeit and shoddy goods are becoming increasingly rampant, using anti-counterfeiting technology maintenance items quality and businessman
The means of prestige are paid attention to by the extreme of product enterprise.Wherein grating anti-counterfeiting technology is low because not depending on printing equipment, production cost
The advantages that become research hotspot.
Notification number is that the patent of invention of CN103903216B discloses one kind based on the anti-fake hidden image vector figure line of grating
Polar plot is embedded in by the determination method of width by determining the mathematical relationship of polar plot line thickness and background color lump site
Into anti-counterfeiting image, and reaches polar plot hiding information with striated pattern and preferably show effect.In the art, although making
Hiding information can be shown with striated pattern, but since the screening parameter setting of background color lump is relatively fixed, according to background color lump
The striated pattern of screening parameter production is easily replicated, antifalsification is poor, therefore striated pattern is easy to be forged out.Use line
Property grating extract hiding information when, the true and false of striated pattern is difficult to distinguish, so that the antifalsification of anti-fake grating be made to face query.
Summary of the invention
The object of the present invention is to provide a kind of grating application methods with anti-copying function, using the identification light of anti-copying
Grid have stronger anti-fake reliability in the Application in Anti-counterfeiting of shadow image.
The present invention provides the following technical solutions: a kind of grating application method with anti-copying function, including following
Step:
Step (1), selection source images and anti-counterfeiting mark；
Step (2), screening
Color separation is carried out to the green C of source images, magenta M, Huang Y, tetra- chrominance channel black K, and carries out am screening processing respectively, is obtained
To the Halftone Image of four chrominance channels；
Step (3) calculates displacement
At least one of selected blueness C, magenta M, Huang Y, tetra- chrominance channel black K are used as anti-fake mother matrix, according to anti-fake mother matrix
The displacement of screening parameter calculating sub-image site；
Step (4), insertion anti-counterfeiting mark
Anti-counterfeiting mark is embedded into the Halftone Image of anti-fake mother matrix according to displacement, formation hide Layers and with residue
Halftone Image merges, and obtains the anti-counterfeiting image containing anti-counterfeiting mark；
Step (5), production identification grating
Screening processing is carried out again to anti-fake mother matrix, screening parameter is identical as the screening parameter in step (3), obtains another
A anti-fake mother matrix Halftone Image；According to the mesh tune of screening parameter, input resolution ratio and the big little makings of image and anti-fake mother matrix
The corresponding identification grating of image；
Identification grating is added on anti-counterfeiting image by step (6), extracts anti-counterfeiting mark.
It is as above-mentioned technical proposal to further describe:
Screening parameter in step (2) the am screening processing includes output resolution ratio, screen frequency L, dot shape
And screen angle.
It is as above-mentioned technical proposal to further describe:
The output resolution ratio is 1440~2450dpi, screen frequency L is 96~175lpi, dot shape is round, blueness
C, magenta M, Huang Y, tetra- chrominance channel black K screen angle α be respectively set to 0 °, 15 °, 45 °, 75 °.
It is as above-mentioned technical proposal to further describe:
In the step (3), the calculation method of the displacement of sub-image site are as follows:
(1), the center between neighbour node is calculated away from d
D=25.4/L, unit mm；
(2), the horizontal displacement x and vertical displacement amount y of site are calculated
It is as above-mentioned technical proposal to further describe:
The embedding grammar of anti-counterfeiting mark in the step (4) are as follows:
(1), source images are opened in image processing software, then create figure layer again, anti-counterfeiting mark duplication are pasted onto new
It builds in figure layer, deletes the newly-built figure layer again after choosing anti-counterfeiting mark using magic wand menu, retain the profile of anti-counterfeiting mark；
(2), C-channel is chosen, is carried out the sub-image site in anti-counterfeiting mark according to horizontal displacement x and vertical displacement amount y
It is mobile, complete the insertion of anti-counterfeiting mark；Four chrominance channels are then combined with, the anti-counterfeiting image containing anti-counterfeiting mark is obtained.
It is as above-mentioned technical proposal to further describe:
Anti-fake mother matrix in the step (3) is C-channel.
It is as above-mentioned technical proposal to further describe:
The production method of identification grating in the step (5) are as follows:
(1), source images are opened in image processing software, and screening processing is carried out to anti-fake mother matrix, output resolution ratio is set
It is 96~175lpi for 1440~2450dpi, screen frequency L, dot shape is circle, and screen angle α is 0 °；Execute " image/
Mode/gray scale " processing, conversion proportion 1:1；
(2), a color mode, resolution ratio and image size file identical with source images, the background of file are created
It is transparent；
(3), the Background From Layer in source images is activated, uses " magic wand menu " to click site, and replicate and paste step (2)
In file to get the identification grating.
Beneficial effects of the present invention: using the identification grating of anti-copying, have in the Application in Anti-counterfeiting of shadow image relatively strong
Anti-fake reliability, be characterized in particular in:
(1), identification grating has anti-copying performance
It is opened different from dot matrix in the prior art (dot) grating or linear (straight line) grating, identification grating of the invention
Scrambling is presented invasively, in the anti-fake application of grating, with the variation of mother matrix Halftone Image anti-fake in source images
And change, it is superimposed on after being synthesized due to anti-fake mother matrix with remaining Color Channel in anti-counterfeiting image, adulterator is difficult to obtain anti-
Pseudo- mother matrix complete screening parameter in am screening, to be difficult to make corresponding image formation identification grating on grating.
In addition, even if the image of the direct replica on piece of adulterator, as screening again in a replication process
Anti-fake mother matrix site is caused to generate variation, the halftone dot image in lenticular lenses can not just extract anti-counterfeiting mark, finally lead once changing
Cause anti-fake failure.
Therefore, the identification grating that the present invention uses is resisting anti-fake attack to achieve good technological progress, itself tool
There is anti-copying, compared in the prior art, can not only guarantee the anti-counterfeiting performance of source images, and can guarantee the anti-of lenticular lenses
Pseudo- performance.
(2), effect is ideal in the application of shadow image
The poor problem of the concealment and extractability that the anti-pseudoprocess of grating based on shadow image in the prior art often occurs,
Method for anti-counterfeit of the invention not only can snugly be embedded in anti-counterfeiting mark in shadow image, but also in the extraction of anti-counterfeiting mark
Cheng Zhong significantly can clearly extract anti-counterfeiting mark using irregular identification grating in shadow image；
(3), the extraction of identification grating is had excellent performance
Identification grating of the invention is to the extraction highly significant of anti-counterfeiting mark, and the sub-image information of extraction is complete and contrast
Larger, when in use, user can obviously observe anti-counterfeiting mark in correct angles and positions, improve user
Usage experience.
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 flow diagram of anti-counterfeiting mark insertion and extraction in embodiment 1；
Fig. 2 is the anti-fake mother matrix Halftone Image that anti-counterfeiting mark is embedded in embodiment 1 (color information is not shown)；
Fig. 3 is the anti-counterfeiting image in embodiment 1 containing anti-counterfeiting mark (color information is not shown)；
Fig. 4 is the extraction figure of anti-counterfeiting mark in embodiment 1 (color information is not shown)；
Fig. 5 is the partial enlargement diagram at the middle anti-counterfeiting mark in Fig. 4 (color information is not shown)；
Fig. 6 is the extraction figure of anti-counterfeiting mark in comparative example 1 (color information is not shown)；
Fig. 7 is the partial enlargement diagram at the middle anti-counterfeiting mark in Fig. 6 (color information is not shown)；
Fig. 8 is the anti-fake mother matrix Halftone Image that anti-counterfeiting mark is embedded in embodiment 2 (color information is not shown)；
Fig. 9 is the anti-counterfeiting image in embodiment 2 containing anti-counterfeiting mark (color information is not shown)；
Figure 10 is the extraction figure of anti-counterfeiting mark in embodiment 2 (color information is not shown)；
Figure 11 is the partial enlargement diagram at the middle anti-counterfeiting mark in Figure 10 (color information is not shown)；
Figure 12 is the extraction figure of anti-counterfeiting mark in comparative example 2 (color information is not shown)；
Figure 13 is the partial enlargement diagram at the middle anti-counterfeiting mark in Figure 12 (color information is not shown).
Specific embodiment
Embodiment 1
Referring to Fig. 1, a kind of grating application method with anti-copying function is provided in the present embodiment, comprising the following steps:
Step (1), selection source images and anti-counterfeiting mark
Select source images: selecting a width color mode is CMYK, resolution ratio 2450dpi, size are the dark of 4 × 4.8cm
It changes the line map picture, and is named as " source images .GIF "；
Anti-counterfeiting mark is arranged: anti-counterfeiting mark is " T " in the present embodiment, and one is created in Adobe Photoshop software
Color mode is CMYK, resolution ratio 2450dpi, size are 4 × 4.8cm, background content is transparent file, is made hereof
Being inserted into a font with " the Type tool " is " T " that upright super thick black simplified, font size is 48 points, and is named as " anti-counterfeiting mark
.GIF"；
Step (2), screening
In Adobe Photoshop software open " source images .GIF ", to green C, magenta M, Huang Y, tetra- channels black K into
Row separation executes " image/mode/bitmap " processing, adjusts screen using half, setting output resolution ratio is 2450dpi, frequency (adds
Screen density L) be that 175lpi, dot shape are provided in round, the screen angle of tetra- chrominance channel C, M, Y, K be respectively set to 0 °,
15 °, 45 °, 75 °, the Halftone Image after obtaining 4 channel screenings, and separately deposited；
Step (3) calculates displacement
Anti-fake mother matrix is green C-channel in the present embodiment, and mobile site in C-channel so that be embedded in anti-counterfeiting mark, wherein shape
Site at anti-counterfeiting mark is sub-image site, the calculation method of the displacement of sub-image site are as follows:
(1), the center between neighbour node is calculated away from d
D=25.4/L, unit mm；
(2), the horizontal displacement x and vertical displacement amount y of site are calculated
Step (4), insertion anti-counterfeiting mark
Anti-counterfeiting mark is embedded into the Halftone Image of anti-fake mother matrix according to displacement, specifically:
(1), source images are opened in image processing software, then create figure layer again, " anti-counterfeiting mark .GIF " are replicated viscous
It is attached in newly-built figure layer, deletes the newly-built figure layer again after choosing anti-counterfeiting mark (capitalization " T ") using magic wand menu, retain anti-
The profile of puppet mark (capitalization " T ")；
(2), C-channel referring to fig. 2, is chosen, according to horizontal displacement x and vertical displacement amount y by the sub-image in anti-counterfeiting mark
Site is moved, and the scaling of figure layer is amplified to maximum (3200%), chooses C-channel, clicks " mobile tool ", according to
Site in anti-counterfeiting mark (capitalization " T ") is carried out quantitative movement by the displacement of sub-image, to complete the embedding of anti-counterfeiting mark
Enter；Four chrominance channels are then combined with, referring to Fig. 3, obtain the anti-counterfeiting image containing anti-counterfeiting mark, and save as " anti-counterfeiting image
.GIF”。
Step (5), production identification grating
(1), " source images .GIF " is opened in Adobe Photoshop software, " image/mode/position is executed to C-channel
Figure " handles and throws away other channels, adjusts screen using half, setting output resolution ratio is 2450dpi, frequency (screen frequency) is
175lpi, dot shape are circle, screen angle is 0 °, execute " image/mode/gray scale " processing after setting up again, convert ratio
Example is 1:1；
(2), the file that a color mode is CMYK, resolution ratio 2450dpi, image size are 4 × 4.8cm is created,
The background of file is transparent；
(3), the Background From Layer in source images is activated, uses " magic wand menu " to click black site, and replicate and paste newly
On the file built, that is, forming a simulation numeral grating is to identify that grating, shape information and the image C-channel of the grating add
Image information after net fits like a glove, and is named as " identification grating .GIF "；
Step (6) extracts anti-counterfeiting mark
It will identify that grating replication pastes on anti-counterfeiting image with Fig. 5 referring to fig. 4, identification grating will be in anti-counterfeiting image C-channel
Non- latent image site all covers in, and only leaks out site (light tight region and blueness C in anti-counterfeiting mark (capitalization " T ")
The dot area not moved in channel is completely coincident, and will not moved site and all be covered；The complete light transmission of transmission region, manifests shifting
Site after dynamic), i.e. the interior site of anti-fake text " T " is shown, to completely extract anti-counterfeiting mark (capitalization
“T”)。
Embodiment 2
Referring to Fig. 8,9 and 10, compared with Example 1, embodiment 2 the difference is that:
(1), the performance content of source images is different, and the input resolution ratio of source images be 1440dpi, having a size of 4 ×
3.75cm, screen frequency 180lpi；Anti-counterfeiting mark is figure；
(2), due to screen frequency difference, corresponding displacement is also different；
(3), the corresponding identification grating presented is different.
Comparative example
Comparative example 1
Referring to Fig. 6 and Fig. 7, compared with Example 1, comparative example 1 is the difference is that identification grating is the dot matrix of rule
Grating (extracting method of lattice raster is technological means commonly used in the art, therefore is not repeated).
Using FSIM algorithm (value of FSIM is smaller, and the conspicuousness for representing extraction is higher), comparative example 1 is evaluated respectively and is implemented
Extraction figure of the identification grating on anti-counterfeiting image is obtained in example 1, obtained result is as shown in table 1 below:
The different gratings of table 1 extract the FSIM value after anti-counterfeiting mark
It was found from the calculated result of table 1: the FSIM value of embodiment 1 reduces 16.53% compared with the FSIM value of comparative example, implements
The FSIM value of example 1 is closer to 0, and comparison diagram 4 and Fig. 6, and anti-counterfeiting mark is apparent in Fig. 4 of embodiment 1, the knowledge of embodiment 1
Other grating has in the Application in Anti-counterfeiting of shadow image and preferably extracts performance.
Comparative example 2
Referring to Figure 12 and Figure 13, compared with Example 2, comparative example 2 is the difference is that identification grating is the point of rule
Battle array grating.
Using FSIM algorithm, the extraction that identification grating is obtained in comparative example 2 and embodiment 2 on anti-counterfeiting image is evaluated respectively
Figure, obtained result are as shown in table 2 below:
The different gratings of table 2 extract the FSIM value after anti-counterfeiting mark
It was found from the calculated result of table 2: the FSIM value of embodiment 2 reduces 18.13% compared with the FSIM value of comparative example, implements
The FSIM value of comparative example 2 is already close to 1 closer to 0, and at this time for the FSIM value of example 1, comparison diagram 10 and Figure 12, using existing skill
In art in the extraction figure of conventional grating, anti-counterfeiting mark can not almost be observed, and extraction effect is very undesirable, and the figure of embodiment 2
Anti-counterfeiting mark is apparent in 10, and the identification grating of embodiment 2 has better extractability in the Application in Anti-counterfeiting of shadow image
Energy.
In addition, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12 and Figure 13 are removal color
The half-tone picture of information, half-tone picture are made of site, compared with the source images for continuously adjusting form, clarity and colour generation shape
Formula is different, and half-tone picture is the image of discretization, is used for the output for printing, and clarity is completely shown；It further illustrates,
It can clearly show that the extraction effect of comparative example 1 and comparative example 2 is very bad in Fig. 6, Fig. 7, Figure 12 and Figure 13.
Claims (7)
1. a kind of grating application method with anti-copying function, which comprises the following steps:
Step (1), selection source images and anti-counterfeiting mark；
Step (2), screening
Color separation is carried out to the green C of source images, magenta M, Huang Y, tetra- chrominance channel black K, and carries out am screening processing respectively, obtains four
The Halftone Image of chrominance channel；
Step (3) calculates displacement
At least one of selected blueness C, magenta M, Huang Y, tetra- chrominance channel black K are used as anti-fake mother matrix, according to the screening of anti-fake mother matrix
The displacement of parameter calculating sub-image site；
Step (4), insertion anti-counterfeiting mark
Anti-counterfeiting mark is embedded into the Halftone Image of anti-fake mother matrix according to displacement, formation hide Layers and with remaining mesh
It changes the line map as merging, obtains the anti-counterfeiting image containing anti-counterfeiting mark；
Step (5), production identification grating
Screening processing is carried out again to anti-fake mother matrix, screening parameter is identical as the screening parameter in step (3), and it is anti-to obtain another
Pseudo- mother matrix Halftone Image；According to screening parameter, the Halftone Image of input resolution ratio and image big little makings and anti-fake mother matrix
Corresponding identification grating；
Identification grating is added on anti-counterfeiting image by step (6), extracts anti-counterfeiting mark.
2. the grating application method according to claim 1 with anti-copying function, it is characterised in that: the step (2)
Screening parameter in am screening processing includes output resolution ratio, screen frequency L, dot shape and screen angle.
3. the grating application method according to claim 2 with anti-copying function, it is characterised in that: the output is differentiated
Rate is 1440~2450dpi, screen frequency L is 96~175lpi, dot shape is round, green C, magenta M, Huang Y, tetra- color of black K
The screen angle α in channel is respectively set to 0 °, 15 °, 45 °, 75 °.
4. the grating application method according to claim 2 with anti-copying function, it is characterised in that: the step (3)
In, the calculation method of the displacement of sub-image site are as follows:
(1), the center between neighbour node is calculated away from d
D=25.4/L, unit mm；
(2), the horizontal displacement x and vertical displacement amount y of site are calculated
5. the grating application method according to claim 4 with anti-copying function, it is characterised in that: the step (4)
The embedding grammar of middle anti-counterfeiting mark are as follows:
(1), source images are opened in image processing software, then create figure layer again, and anti-counterfeiting mark duplication is pasted onto newly-built figure
On layer, the newly-built figure layer is deleted again after choosing anti-counterfeiting mark using magic wand menu, retains the profile of anti-counterfeiting mark；
(2), C-channel is chosen, is moved the sub-image site in anti-counterfeiting mark according to horizontal displacement x and vertical displacement amount y,
Complete the insertion of anti-counterfeiting mark；Four chrominance channels are then combined with, the anti-counterfeiting image containing anti-counterfeiting mark is obtained.
6. the grating application method according to claim 1 with anti-copying function, it is characterised in that: the step (3)
In anti-fake mother matrix be C-channel.
7. the grating application method according to claim 1 with anti-copying function, it is characterised in that: the step (5)
The production method of middle identification grating are as follows:
(1), source images are opened in image processing software, screening processing are carried out to anti-fake mother matrix, setting output resolution ratio is
1440~2450dpi, screen frequency L are 96~175lpi, and dot shape is circle, and screen angle α is 0 °；Execute " image/mould
Formula/gray scale " processing, conversion proportion 1:1；
(2), creating a color mode, resolution ratio and image size file identical with source images, the background of file is
It is bright；
(3), the Background From Layer in source images is activated, uses " magic wand menu " to click site, and replicate and paste in step (2)
File is to get the identification grating.
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| CN201810812271.5A CN108961143A (en) | 2018-07-23 | 2018-07-23 | A kind of grating application method with anti-copying function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110086956A (en) * | 2019-05-21 | 2019-08-02 | 温州立可达印业股份有限公司 | A kind of halftoning hidden image relief effect shows hidden method |
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| US20160275743A1 (en) * | 2013-10-28 | 2016-09-22 | Rusi Information Technology (Shanghai) Co., Ltd. | Method and System for Printing Stock Anti-Counterfeiting by means of Feature Image |
| CN106891632A (en) * | 2015-12-21 | 2017-06-27 | 深圳市科彩印务有限公司 | The preparation method of printed matter grating and the combined and spliced anti-fake mark of image-carrier |
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2018
- 2018-07-23 CN CN201810812271.5A patent/CN108961143A/en active Pending
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| US20160275743A1 (en) * | 2013-10-28 | 2016-09-22 | Rusi Information Technology (Shanghai) Co., Ltd. | Method and System for Printing Stock Anti-Counterfeiting by means of Feature Image |
| CN106891632A (en) * | 2015-12-21 | 2017-06-27 | 深圳市科彩印务有限公司 | The preparation method of printed matter grating and the combined and spliced anti-fake mark of image-carrier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110086956A (en) * | 2019-05-21 | 2019-08-02 | 温州立可达印业股份有限公司 | A kind of halftoning hidden image relief effect shows hidden method |
| CN110086956B (en) * | 2019-05-21 | 2020-12-04 | 增和包装股份有限公司 | Display and hiding method for halftone hidden image floating effect |
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Application publication date: 20181207 |
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