CN104859329B - A kind of moir patterns method for anti-counterfeit based on linear grating - Google Patents
A kind of moir patterns method for anti-counterfeit based on linear grating Download PDFInfo
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Abstract
The invention discloses a kind of moir patterns method for anti-counterfeit based on linear grating, specially：Step 1, sets up background color lump, and four passages in background color lump are separated；Step 2, screening treatment is carried out to each passage respectively, wherein the passage of embedded hiding information, its dot shape is straight line, and rest channels are circle；Step 3, makes hidden image；Step 4, makes the digital picture containing hiding information；Step 5, makes linear grating；Step 6, extracts hiding information.Be embedded into hiding information on a certain passage through straight line screening by the present invention, the conventional site screening of other passages, finally extracts hiding information by the linear grating of matching.Digital picture of the present invention after embedded hiding information reaches good concealment effect；When hiding information is extracted, sharp contrast and the Color development of covert channel by areal concentration have highlighted hiding information, improve hiding information and manifest definition, so as to improve the false proof quality of moir patterns.
Description
Technical field
The invention belongs to antiforge field, it is related to a kind of moir patterns method for anti-counterfeit based on linear grating.
Background technology
The false proof anti-counterfeiting technology for being to be combined based on halftone screen technology and Moire effect generation of moir patterns.The method letter
Easy row, to equipment and typography without requirement too high, false proof mesh is can reach in the case of production cost is not increased
, thus it is a kind of very promising method for anti-counterfeit that moir patterns are false proof.But the current method for anti-counterfeit extracts hiding information
Lack of defination, its false proof quality need to be improved, and it is preferably applied in actual production.
The content of the invention
It is an object of the invention to provide a kind of moir patterns method for anti-counterfeit based on linear grating, solve existing moir patterns and prevent
Fake method extracts the lack of defination of hiding information, false proof problem of low quality.
The technical solution adopted in the present invention is, a kind of moir patterns method for anti-counterfeit based on linear grating, specifically according to
Lower step is implemented：
Step 1, sets up background color lump, and to background color lump in blue or green C, magenta M, Huang Y, four passages of black K are divided
From；
Step 2, screening treatment：
Each passage is processed with self-defined screening function respectively, wherein the passage of embedded hiding information, its site shape
Shape is straight line, and rest channels dot shape is circle；
Step 3, makes hidden image；
Step 4, makes the digital picture containing hiding information：
The hidden image that step 3 makes is embedded into the selected covert channel of step 2, merges four passages, formation contains
There is the digital picture of hiding information；
Step 5, makes linear grating；
Step 6, extracts hiding information：
The linear grating that step 5 makes is superimposed in the digital picture containing hiding information that step 4 makes, makes to hide
Information is displayed by the sharp contrast of hidden area and non-concealed region.
The features of the present invention is also resided in,
Background patch image size is 1~10cm × 1~10cm in step 1, and resolution ratio is 350dpi~2800dpi, is adopted
Use cmyk color pattern, and foreground C, M, Y, K dot area percentage 20%~80%.
The screening method that uses for the treatment of is for partly tune screen in step 2, parameter be set to output resolution ratio 350dpi~
2800dpi, frequency is 80LPI~200LPI.
Step 3 is specially：Hiding information figure, canvas size and background color lump are drawn first in Coreldraw softwares
Image size it is identical, and save as AI forms；Then figure is opened in Photoshop, in rasterizing parameter setting
Image size and resolution is identical with background color lump.
Step 4 is specially：The covert channel figure that the replicated figure layer of hidden image that will be made in step 3 is selected to step 2
As in file, activating image constituency and deleting the figure layer, only retain the profile for hiding figure, carried out constituency by mobile instrument
It is mobile, the image of the embedded hiding information of the passage is formed, then four passages are merged, obtain containing hiding information
Digital picture, the numerical value of moving parameter is determined by hidden algorithm.
Hidden algorithm is specially：
Wherein X is horizontal direction displacement, and Y is vertical direction displacement, and D is the spacing between added netting twine, D=
25.4/L, L are screen frequency, and α is screen angle.
It is specially in step 5：Newly-built size, resolution ratio identical gray level image with background color lump, fills foreground, preceding
Scenery dot area percentage determines according to matching algorithm, and half tune screen screening is carried out to image, screen frequency and background color lump
Screen frequency is identical, and screen angle is consistent with the screen angle of the passage of embedded hiding information, obtains linear grating.
Matching algorithm is specially：As the dot area percentage T of covert channel1Less than 50%, linear grating and covert channel
Dot area percentage is complementary relationship, then the dot area percentage T of linear grating2It is 1-T1；As the dot area percentage T of covert channel1≥
50%, linear grating covers the screening straight line of covert channel, i.e. T2≥T1, due to the density in non-concealed region it is minimum should with hide
Region forms sharp contrast, i.e. T2Minimum value is taken, then the dot area percentage T of linear grating2Equal to T1, i.e., matching algorithm is specific
Formula is：
Screening straight line after hidden area is by moving in step 6 is formed with the Straight Combination of grating, is real ground region；It is non-
Hidden area is formed by the site of other each passages with the Straight Combination of grating, is the mesh-like area for having space.
The beneficial effects of the invention are as follows a kind of moir patterns method for anti-counterfeit based on linear grating of the present invention, is by hiding letter
Breath is embedded on a certain passage through straight line screening, the conventional site screening of other passages, finally by the line light of matching
Grid extract hiding information.Digital picture of the method for anti-counterfeit after embedded hiding information reaches good concealment effect；Extracting
During hiding information, sharp contrast and the Color development of covert channel by areal concentration have highlighted hiding information, improve
Hiding information manifests definition, so as to improve the false proof quality of moir patterns.
Brief description of the drawings
Fig. 1 is hidden algorithm geometrical analysis figure of the invention；
Fig. 2 is concealment effect figure in the embodiment of the present invention；
Fig. 3 is embodiment of the present invention cathetus grating effect, and wherein a is complete design sketch, and b is partial enlargement effect
Figure；
Fig. 4 is that hiding information manifests design sketch in the embodiment of the present invention, and wherein a is complete design sketch, and b is partial enlargement effect
Fruit is schemed.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
A kind of moir patterns method for anti-counterfeit based on linear grating of the present invention, specifically implements according to following steps：
Step 1, sets up background color lump：
Size is set up in Photoshop for 1~10cm × 1~10cm, resolution ratio is the figure of 350dpi~2800dpi
Picture, using cmyk color pattern, and foreground green grass or young crops C, magenta M, Huang Y, black K dot area percentages 20%~80%；To blue or green C, magenta
M, Huang Y, tetra- passages of black K are separated, and form the respective image file in four chrominance channels..
Step 2, screening treatment：
Each passage is processed with self-defined screening function respectively, the method for using for：Half adjusts screen, and parameter is set to
Output resolution ratio 350dpi~2800dpi, frequency (screen frequency) is 80LPI~200LPI.Wherein it is embedded in the logical of hiding information
Road, its dot shape is straight line, and the dot shape of rest channels is circle.
Step 3, makes hidden image：
Hiding information figure, the image size phase of canvas size and background color lump are drawn first in Coreldraw softwares
Together, and AI forms are saved as.Then opened in Photoshop, the size and resolution ratio of image are equal in rasterizing parameter setting
It is identical with background color lump.
Step 4, makes the digital picture containing hiding information：
In the covert channel image file that hiding Layers of being made in step 3 is copied to and selected in step 2, image is activated
The figure layer is simultaneously deleted in constituency, only retains the profile for hiding figure, is moved constituency by mobile instrument, the number of moving parameter
Value is determined that hidden algorithm formula is specific as follows by hidden algorithm：
Wherein X is horizontal direction displacement, and Y is vertical direction displacement, and N is the spacing between added netting twine, N=
25.4/L, L are screen frequency, and α is screen angle.
One channel image containing hiding information is formed by mobile constituency, is then merged four passages, most
End form is into the digital picture containing hiding information.
Step 5, makes linear grating：
The newly-built grayscale mode file as the size, resolution ratio of background color lump in Photoshop, the prospect of filling
Color dot area percentage determines that matching algorithm is specific as follows according to matching algorithm：
Hiding information is extracted for clear, it is desirable to as the dot area percentage T of covert channel1Less than 50%, linear grating with it is hidden
The dot area percentage for hiding passage is complementary relationship, then the dot area percentage T of linear grating2It is 1-T1；When the dot surface of covert channel
Product rate T1More than or equal to 50%, then require that linear grating covers the screening straight line of covert channel, i.e. T2≥T1, non-concealed is required again
The density in region is minimum, and forms sharp contrast, i.e. T with hidden area2Minimum value is taken, then the dot area percentage T of linear grating2
It is T1.That is the specific formula of matching algorithm is：
After filling foreground according to matching algorithm, the screening of the screen screening of straight line, screen frequency and background color lump is carried out
Line number is identical, and screen angle is consistent with the screen angle of the passage of embedded hiding information, forms linear grating.
Step 6, extracts hiding information：
The linear grating figure layer that step 5 is made is copied in the digital picture containing hiding information that step 4 makes, will
Hiding information manifests.For hidden area, it is put together by the screening straight line after movement and the straight line of grating, is face area on the spot
Domain；And for non-concealed region, then formed by the site of other each passages and the Straight Combination of grating, it is have space netted
Region.Sharp contrast and the Color development of covert channel by areal concentration, have highlighted hiding information.
A kind of moir patterns method for anti-counterfeit based on linear grating of the present invention, by hiding information be embedded into through straight line screening certain
On one color version, the conventional site screening of other color versions finally extracts hiding information by the linear grating of matching.The present invention exists
Digital picture after embedded hiding information reaches good concealment effect；The present invention is close by region when hiding information is extracted
The sharp contrast of degree and the Color development of covert channel, have highlighted hiding information, improve hiding information and manifest definition, from
And improve the false proof quality of moir patterns.
Now so that hiding information is embedded in blue or green version as an example, specifically bright making of the invention and operating process.
Step 1, sets up background color lump：
Size is set up in Photoshop for 3cm × 3cm, resolution ratio is the image of 2400dpi, and color mode is CMYK,
Filling foreground C, M, Y, K dot area percentage are respectively 20%, and tetra- passages of C, M, Y, K are separated, and form four chrominance channels
Respective image file.
Step 2, screening treatment；
Four channel images are performed with " image/pattern/bitmap " treatment respectively, parameter is set to output resolution ratio
2400dpi, the method for using adjusts screen for half, and frequency (screen frequency) is 175LPI, and C-channel dot shape is straight line, remaining
The dot shape of passage is circle, and tetra- passage screen angles of C, M, Y, K are respectively 15 °, 75 °, 90 °, 45 °.After setting up again
" image/pattern/gray scale " treatment is performed, conversion proportion is 1.
Step 3, makes hidden image：
Hiding information figure is drawn first in Coreldraw softwares, and (hidden image of the present embodiment is " Shaanxi science and technology "
Four Chinese characters), canvas size is 30mm × 30mm, and saves as AI forms.Then opened in Photoshop, rasterizing ginseng
The size of image is 3cm × 3cm in number setting, and resolution ratio is 2400dpi.
Step 4, makes the digital picture containing hiding information：
During step 3 to be made the hidden image for obtaining through " duplicate layer " to C-channel image file, activated with magic wand menu
The figure layer is simultaneously deleted in image constituency, only retains the profile for hiding figure, then perform " filter/other/displacement " treatment, and according to
The pixel value that hidden algorithm calculated level is moved respectively with vertical direction, specially：As shown in figure 1, by the rectilinear movement where A
Linear position to where O (midpoint of AB), then need to carry out moving respectively for level and vertical direction, i.e. AD and OD.According to
The geometrical relationship of triangle, the specific formula of hidden algorithm is：
Wherein AB=25.4/L, L are screen frequency, and α is screen angle.
Result of calculation is：Level is moved right 2 pixels, and -7 pixels are moved vertically downward, and mobile constituency forms C-channel
Hidden image, is then combined with four passages, ultimately forms the digital picture containing hiding information, and its effect is as shown in Figure 2.
Step 5, makes linear grating：
Newly-built size is 3cm × 3cm in Photoshop, and resolution ratio is 2400dpi, and color mode is gray scale.According to
Matching algorithm, because of T1Be 20%, then T2It is 80%, that is, it is 80% that foreground C, M filled, Y are 0, K, and performs " image/mould
Formula/bitmap " treatment, parameter is set to output resolution ratio 2400dpi, uses method to adjust screen for half, and frequency (screen frequency) is
175LPI, is shaped as straight line, and angle is 15 °, forms the linear grating of matching.Its effect is as shown in figure 3,3a is complete effect
Figure, 3b is partial enlargement design sketch.
Step 6, extracts hiding information：
The linear grating figure layer that step 5 is made copies to the digital image file containing hiding information that step 4 makes
In, manifest hiding information, effect as shown in figure 4, wherein 4a be complete design sketch, 4b be partial enlargement design sketch.Can by Fig. 4 b
For hidden area, it is put together by the screening straight line after movement and the straight line of grating to see, is real ground region, and
For non-concealed region, formed with the Straight Combination of grating by the site of other each passages, be the mesh-like area for having space.It is logical
The sharp contrast of areal concentration and the Color development of covert channel are crossed, hiding information has been highlighted, reached as shown in fig. 4 a
Complete effect.
Claims (7)
1. a kind of moir patterns method for anti-counterfeit based on linear grating, it is characterised in that specifically implement according to following steps：
Step 1, sets up background color lump, and to background color lump in blue or green C, magenta M, Huang Y, four passages of black K separate；
Step 2, screening treatment：
Each passage is processed with self-defined screening function respectively, for the passage of embedded hiding information, its dot shape is
Straight line, rest channels dot shape is circle；
Step 3, makes hidden image；
Step 4, makes the digital picture containing hiding information：
The hidden image that step 3 makes is embedded into the selected covert channel of step 2, merges four passages, formed containing hidden
The digital picture of Tibetan information；
Step 5, makes linear grating：
Newly-built size, resolution ratio identical gray level image with background color lump, fills foreground, foreground dot area percentage according to
Matching algorithm determines, and half tune screen screening is carried out to image, and screen frequency is identical with the screen frequency of background color lump, screening angle
Degree is consistent with the screen angle of the passage of embedded hiding information, obtains linear grating；
The matching algorithm is specially：When the dot area percentage T1 of covert channel is less than 50%, linear grating and covert channel
Dot area percentage is complementary relationship, then the dot area percentage T2 of linear grating is 1-T1；As the dot area percentage T1 of covert channel
>=50%, linear grating covers the screening straight line of covert channel, i.e. T2 >=T1, due to the minimum Ying Yuyin of the density in non-concealed region
Tibetan area domain forms sharp contrast, i.e. T2 and takes minimum value, then the dot area percentage T2 of linear grating is equal to the tool of T1, i.e. matching algorithm
Body formula is：
Step 6, extracts hiding information：
The linear grating that step 5 makes is superimposed in the digital picture containing hiding information that step 4 makes, makes hiding information
Displayed by the sharp contrast of hidden area and non-concealed region.
2. a kind of moir patterns method for anti-counterfeit based on linear grating according to claim 1, it is characterised in that the step
Background patch image size is 1~10cm × 1~10cm in 1, and resolution ratio is 350dpi~2800dpi, using cmyk color mould
Formula, and foreground C, M, Y, K dot area percentage 20%~80%.
3. a kind of moir patterns method for anti-counterfeit based on linear grating according to claim 1, it is characterised in that the step
The method that screening treatment is used in 2 adjusts screen for half, and parameter is set to output resolution ratio 350dpi~2800dpi, and frequency is
80LPI~200LPI.
4. a kind of moir patterns method for anti-counterfeit based on linear grating according to claim 1, it is characterised in that the step
3 are specially：Hiding information figure, the image size phase of canvas size and background color lump are drawn first in Coreldraw softwares
Together, and AI forms are saved as；Then figure is opened in Photoshop, the image size in rasterizing parameter setting and point
Resolution is identical with background color lump.
5. a kind of moir patterns method for anti-counterfeit based on linear grating according to claim 1, it is characterised in that the step
4 are specially：In the covert channel image file that the replicated figure layer of hidden image that will be made in step 3 is selected to step 2, activation
The figure layer is simultaneously deleted in image constituency, only retains the profile for hiding figure, is moved constituency by mobile instrument, forms this and leads to
The image of the embedded hiding information in road, then merges four passages, obtains the digital picture containing hiding information, mobile
The numerical value of parameter is determined by hidden algorithm.
6. a kind of moir patterns method for anti-counterfeit based on linear grating according to claim 5, it is characterised in that described to hide
Algorithm is specially：
Wherein X is horizontal direction displacement, and Y is vertical direction displacement, and D is the spacing between added netting twine, D=25.4/
L, L are screen frequency, and α is screen angle.
7. a kind of moir patterns method for anti-counterfeit based on linear grating according to claim 1, it is characterised in that the step
Screening straight line after hidden area is by moving in 6 is formed with the Straight Combination of grating, is real ground region；Non-concealed region is by it
He forms the site of each passage with the Straight Combination of grating, is the mesh-like area for having space.
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| 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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| CN108961142A (en) * | 2018-07-13 | 2018-12-07 | 合肥信亚达智能科技有限公司 | A kind of hiding performance improved method of sub-image profile |
| CN109035124A (en) * | 2018-07-13 | 2018-12-18 | 合肥信亚达智能科技有限公司 | A kind of sub-image site error diffusion setting method improving not sentience |
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