CN106157336B - Digital net hanging method and system are schemed based on directly modified high-fidelity hiding - Google Patents
Digital net hanging method and system are schemed based on directly modified high-fidelity hiding Download PDFInfo
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- CN106157336B CN106157336B CN201610519053.3A CN201610519053A CN106157336B CN 106157336 B CN106157336 B CN 106157336B CN 201610519053 A CN201610519053 A CN 201610519053A CN 106157336 B CN106157336 B CN 106157336B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/005—Colour cards; Painting supports; Latent or hidden images, e.g. for games; Time delayed images
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
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Abstract
The present invention provides one kind based on direct modified high-fidelity hiding figure number net hanging method and system, is related to anti-counterfeiting printing technology field.This method includes to after table figure routine linked network hiding figure, by printing image fault forecasting system image deflects caused by hiding figure and printing process are made with the prediction of quantitative accurate, accurately alignment compensation is carried out by image compensation optimization system, obtains the printed matter containing base map of high-fidelity；System includes color separation module, linked network module, site modulation module, printing image fault prediction module, image fault compensation optimizing module, optimum results determination module and Plate making printing module.It is provided by the invention that digital net hanging method and system are schemed based on directly modified high-fidelity hiding, the base map of multilayer high definition, multi-level gray scale is hidden in the case where guaranteeing table figure high-fidelity, table plot quality can be effectively improved, expand Application Range, base map modulation amplitude is big, good visual effect, high resolution, and be suitable for various site modulation systems and combinations thereof.
Description
Technical field:
The present invention relates to anti-counterfeiting printing technology fields, more particularly to one kind to scheme digital hang based on directly modified high-fidelity hiding
Network method and system.
Background technique:
Has quite long history in the technology that the Biao Tuli of printing hides other images or information.With the number of printing
Change and develop, the technical method of more and more hidden images or information is developed application, most commonly used to apply anti-fake
Field.
The image for the actual displayed that observer can see is known as table figure；By particular technology be hidden in it is under table figure,
Naked eyes can not differentiate and by corresponding detection means just can see image be known as base map；By base map be hidden in table figure it
Under process be known as hide figure.
Conventional most of print systems do not have true intrinsic expressing gradation ability, such as offset printing, flexo etc., in order to
One width is had on certain present substrate (such as paper) of chart of gray scale, the technology of linked network makes possible, and macroscopical gray scale is
Reached by the plane coverage rate of microcosmic inking.Digital linked network system be exactly a grey chromatic graph is converted into only have (0,1) or
The software systems of the high resolution bitmap (number half adjusts net figure or halftone screen figure) of two levels of black and white.After digital linked network, then
By plate-making, printed matter is can be obtained in printing.
Existing hiding diagram technology is varied, and most of is to have screen angle modulation, site frequency tune based on digital linked network
System, network cable frequency modulation, dot shape modulation, cable phase-modulation, site phase-modulation, two-way site (cable) phase tune
System, the methods of dynamic mole line.The basic principle of these methods is: initial being opened from one referring to net point net screen system structure
Begin, requires according to hiding figure, according to the figure of hiding figure, the system structure referring to site screen is modulated, modulator approach includes
Size, shape, black and white, position, phase, the density of site, frequency, angle etc..
According to modulation system, corresponding detection mode is also different, and basic principle is modulated site screen
It is compared with initial referring to site screw structure, thus the information that decryption is hiding.Machine detection mainly scanning addend evidence point
Analysis；Optical detection is to create an optical mask or micro mirror according to the structure or its certain feature of initial reference site screen
Then array (such as lenticular lenses) will test diaphragm image planes cover and be equally covered on table figure as detection diaphragm, through detection film
Piece, so that it may decrypt hiding image or information.
Hiding diagram technology is realized by the structural modulation to screen, the both macro and micro feature including screen, such as just
To, frequency, the size of site, position, shape etc., the half-tone containing base map, structure is complicated.Existing hiding diagram technology is to table figure
Picture quality can bring significantly damages, have certain destruction and upset to the structure of halftone dot during hiding figure, specifically
It is embodied in showing for base map region or/and revealing for base map edge on table figure, this defect strongly limits answering for hiding diagram technology
With range and anti-fake effect.In order to avoid the defect that base map region shows or/and base map edge is revealed on table figure, the prior art is adopted
Method is usually the modulation amplitude and contrast for reducing base map, reduces the image quality requirement to table figure, or reduce base map
Resolution ratio only hides simple icon or text, or reduces the Application Range of table figure, and base map is confined to a certain narrow color
Rank (concentration) range is confined to the image local insensitive to observer, such as mixed and disorderly small local or coarse color lump
Deng.It is simple and wide-spread to hide diagram technology principle, it is with low content of technology if the picture quality of Biao Tu and base map is not high, very
It is easy to be copied, in special application field, in anti-counterfeiting technology, is just unable to reach due effect.
The physical process of printing is simulation (nonnumeric) process, and therefore, distortion, noise, unstability etc. can not be kept away
Exempt from, therefore, during the halftone screen point diagram to practical printed matter of rasterizing, site has inevitable distortion, has
When this distortion can also be quite serious.One index of most common of them is exactly the diffusion of site.For example, the photograph of offset printing or flexo
In row, plate-making and printing process, each step has distortion, exposes, develops in the laser printing in digital printing, conversion, clinkering
During, the distortion of each step is all quite serious, these distortions can seriously affect the table plot quality finally printed.It is existing at present
In technology, site distortion (including site diffusion) is difficult to predict, is difficult before printing just in view of the mistake of site in printing process
Very, and accurately compensation correction is performed.
In conventional screening technology, lattice point structure is uniform (periodically or non-periodically), the distortion of site in printing process
Influence to output printed matter is mainly reflected in the brightness of image.Influence caused by this distortion is most of can be attributed to a little
Diffusion, by simple color scheme or color range calibration, that is, resilient.But for irregular uneven lattice point structure, this
A little modification methods are far from enough, and irregular non-uniform lattice point structure is very common in specialty printing, such as anti-counterfeit printing, special
It is not the case where hiding another or multiple images in color printing image.Therefore, to irregular uneven lattice point structure
Linked network system needs to have better correction-compensation method.
Hiding figure usually may cause two class defects to the modulation of lattice point structure, and the first kind is direct caused by half-tone picture
Defect, this kind of defect can identify on half-tone picture, that is to say, that even ideally absolutely not printing out to distortion
Come, defect there is also.To this first kind defect, it is necessary to be corrected.Second class defect can not be directly sentenced in half-tone picture
Other, it is the different print system as caused by the distortion of print system and the upset interaction of lattice point structure, as a result not
Together.Second class defect should accurately be compensated on digital halftone net figure for setting print system.The prior art pair
Second class defect is not also very effectively.
JURA company, Hungary its patent (US6104812) it is inner propose it is a kind of by super cell carry out calibration calculation
Method is modified digital site, and table plot quality is significantly improved, but and imperfect.This algorithm is not effectively to print
Defect caused by the distortion of site (i.e. the second class defect) compensates in the physical process of brush, and therefore, result is only to printing
It is effective to be distorted the relatively low printed matter of relatively small or screen frequency for site in physical process.Specifically, being exactly to lose
Lattice point structure must be very much smaller than.Therefore, the application range of the technology is very limited.
Summary of the invention:
In view of the drawbacks of the prior art, the present invention provides a kind of based on direct modified high-fidelity hiding figure number net hanging method
And system, by establishing an automatic high-fidelity hiding figure number linked network system, in the case where keeping table figure high-fidelity, in height
Multilayer high definition, multi-level gray scale base map is hidden under the color table figure of quality, can effectively improve table plot quality, expands table figure
Application Range, suppressible base map modulation amplitude is big, contrast is high, good visual effect, high resolution, can effectively improve on table figure
It is suitble to the color range range of hiding figure, and is suitable for the combination of various hiding figure modulation systems or modulation system.
On the one hand, the present invention provides a kind of based on direct modified high-fidelity hiding figure number net hanging method, comprising:
(a) input table figure and at least one base map；
(b) it is required to carry out color separation to table figure according to the print system of setting, obtains each monochromatic table figure；
(c) each monochromatic table figure after color separation is subjected to conventional numerical linked network, obtains each monochromatic halftone screen figure；
(d) at least one of each monochromatic halftone screen figure after linked network is modulated according to base map by setting means,
Export its corresponding modulated halftone screen figure of hiding figure；
(e) according to setting mode of printing and parameter, the picture after modulated halftone screen figure printing is schemed at least one hiding
Matter distortion and table figure defect are predicted；
(f) the image quality distortion and table figure defect obtained according to prediction, carries out corresponding Optimization Compensation to halftone screen figure；
(g) the halftone screen figure after Optimization Compensation is exported.
Further, after step (g), the halftone screen figure after Optimization Compensation is completed into print by setting mode of printing
Brush.
Further, if table figure is color image, table figure is divided into tetra- color of RGB trichromatic diagram or CMYK in step (b)
Figure or other polychrome figures or the polychrome figure for adding other spot colors；If table figure is grayscale image, table figure only has black one in step (b)
Kind chromatic graph.
Further, conventional numerical net suspension mode is based on periodic, acyclic or random site or cable.
Further, figure modulation system in hiding includes adjusting to some or multiple attributes of site or cable by base map
System, the attribute includes angle, phase, size, shape, density, frequency, position and gray scale.
Further, described to set mode of printing as intaglio printing, letterpress, lithographic printing, porous printing, glue
Print, flexo, silk-screen printing, ink-jet, electrostatic, thermal transfer, heat sublimation or silver salt rinse.
Further, image quality distortion and the prediction of table figure defect be each monochromatic halftone screen figure is carried out respectively it is independent pre-
It surveys, or multiple monochromatic halftone screen figures is printed with the integrated forecasting of the cross-color defect of image after colour superimposition.
Further, image quality distortion and the prediction of table figure defect are on the basis of the halftone screen figure before former table figure or modulation.
Further, the prediction process of image quality distortion and table figure defect uses intelligent algorithm model.
Further, image quality distortion and table figure defect prediction by using one group of Prediction Parameters come control forecasting mode and
Predict target, wherein Prediction Parameters include table figure color separation parameter, table figure resolution ratio, the brightness of table figure, table figure contrast, table figure ginseng
Number Permit interference degree, base map mode, base map chromatograph, base map resolution ratio, base map contrast, modulation system selection and mode of printing choosing
It selects.
Further, Optimization Compensation process is compensated using intelligent algorithm.
Further, Optimization Compensation process controls its function by one group of Optimal Parameters, and Optimal Parameters include that table figure is differentiated
Rate weight, table graph coloring coloured silk weight, table figure luminance weights, table figure color transition weight, base map resolution ratio weight and base map brightness power
Weight.
Further, image quality distortion and the prediction of table figure defect and Optimization Compensation process are by repeatedly circulation, Step wise approximation
Preset state, until meeting optimization aim.
On the other hand, the present invention also provides one kind schemes digital linked network system based on directly modified high-fidelity hiding, comprising:
Color separation module, the table figure for that will input carry out color separation, obtain each monochromatic table figure；
Linked network module, for each monochromatic table figure to be carried out conventional linked network respectively；
Site modulation module sets modulation parameter, determines modulation for according to the figure of base map and hiding the specific requirement of figure
Mode is modulated, and exports the corresponding halftoning digital network figure of each monochrome；
Image fault prediction module is printed, is printed for the halftoning digital network figure to each monochrome formed after modulation in setting
Under brush mode, forecast assessment is carried out to distortion issuable after printing, is also used to each monochromatic half color containing base map that will be obtained
Net figure is adjusted to calculate by colour superimposition, the possible defect of color and Biao Tu multilated site of counterweight poststack printing image is done
Forecast assessment out；
Image fault compensation optimizing module, the assessment parameter for being obtained according to printing image fault prediction module, will be each
Monochromatic halftoning digital network figure carries out corresponding Optimization Compensation, and half after obtaining the independent compensation of each monochrome comprising respective base map
Tone net figure, the parameter that forecast assessment obtains after being also used to be calculated according to colour superimposition, to each monochromatic halftone screen containing base map
Figure carries out corresponding Optimization Compensation, the halftone screen figure after obtaining each monochromatic comprehensive compensation；
Optimum results determination module, for determining whether the halftoning digital network figure after Optimization Compensation reaches default optimization mesh
Mark exports obtained each monochromatic compensated halftoning digital network figure containing base map if reaching requirement, otherwise, will be excellent
Change compensated halftoning digital network figure and returns to printing image fault prediction module；
Plate making printing module, for carrying out Plate making printing for each monochromatic halftone screen figure output after Optimization Compensation.
Further, printing image fault prediction module includes:
Site input module one after modulation, for receiving the halftoning digital network figure exported after the modulation of site modulation module,
Input quantity as printing image fault prediction module；
Printing parameter module, for setting mode of printing and parameter；
Compare parameter setting module, for the halftone screen figure before original table figure or hiding figure and the table figure after hiding figure to be arranged
Comparative indices；
Comparison algorithm module, for comparing the halftone screen figure before the table figure after hiding figure and original table figure or hiding figure；
Distorted result output module, the distortion prediction result obtained for exporting comparison algorithm module.
Further, image fault compensation optimizing module includes:
Site input module two after modulation, for receiving the halftoning digital network figure exported after the modulation of site modulation module,
An input quantity as image fault compensation optimizing module；
Distorted result input module, for receiving the distortion prediction knot predicted in printing image fault prediction module
Fruit, as another input quantity of image fault compensation optimizing module, the i.e. foundation of Optimization Compensation；
Optimal Parameters setup module, for the relevant parameter during Optimization Compensation to be arranged；
Optimization algorithm module, for being exchanged according to the distortion prediction result predicted in printing image fault prediction module
The received halftoning digital network figure of site input module two optimizes compensation after system；
Optimize site output module, the halftoning digital network figure after the Optimization Compensation for obtaining optimization algorithm module is defeated
Out to the optimum results determination module.
As shown from the above technical solution, it is provided by the invention based on directly modified high-fidelity hiding scheme digital net hanging method and
System, using direct modified mode, according to base map and is set by establishing an automatic high-fidelity hiding figure number linked network system
Parameter is set, the site modulation of various modes is directly carried out to table figure, is then mended by printing image fault forecasting system and image
Optimization system is repaid, distortion prediction is carried out to modulated table figure net figure and carries out Optimization Compensation, in the feelings for guaranteeing table figure high-fidelity
Under condition, multilayer high definition, multi-level gray scale base map is hidden under the color table figure of high-quality.
It is provided by the invention that table figure can be effectively improved based on direct modified high-fidelity hiding figure number net hanging method and system
Quality expands the Application Range of table figure.The edge at figure is hidden when hiding figure, on table figure to seamlessly transit, without trace, table chart face
Do not see the trace of multilayer hiding figure, meanwhile, table figure can be the image of any brightness, any contrast, and the gray scale of table figure is variable
Change range is wide, and hiding figure can ensconce below whole picture table figure map sheet；
It is provided by the invention that suppressible base map is made based on direct modified high-fidelity hiding figure number net hanging method and system
Modulation amplitude is big, contrast is high, good visual effect, high resolution, and base map can be the text or image of very little, Zang Tuhou, bottom
Figure high definition, the close inspection piece line number of resolution ratio；
It is provided by the invention that table figure can be effectively improved based on direct modified high-fidelity hiding figure number net hanging method and system
The upper color range range for being suitble to hiding figure can be schemed high-fidelity hiding in panchromatic order range, figure, bottom are hidden especially in smooth color area
Figure can clearly be examined and table figure has no trace.For example, base map can be hidden in several different color ranges or smooth continuously be covered
Cover certain color range range；
It is provided by the invention that digital net hanging method and system are schemed not by specific hiding figure based on directly modified high-fidelity hiding
The influence of modulation system is applicable in various hiding drawing methods, and the hybrid modulation that various ways can be carried out to a certain color separation hides figure；
It is provided by the invention based on directly digital net hanging method is schemed in modified high-fidelity hiding and system can be to each layer base map
Clarity when detection and contrast make control independently, have it will be apparent that also have it is very deep being not easy illusion hiding,
To provide the counterfeit protection measures of different levels, meet the anti-fake demand of different levels；
It is provided by the invention based on directly digital net hanging method is schemed in modified high-fidelity hiding and system can be by a base map
It is divided into several parts, is ensconced in several monochromes respectively, in this case, only detection diaphragm detects to ensconce each list simultaneously
Spirte and synthesis display in color, base map can just display；
It is provided by the invention based on directly digital net hanging method is schemed in modified high-fidelity hiding and system can be hidden under table figure
Stereoscopic effect can be shown by corresponding detection means by hiding three-dimensional base map；Can also by hide specially treated base map,
When examining piece when respective angles are fixed, with the angle of illumination and the variation at visual angle, different effects is generated；Inspection can also be passed through
The rotation or translation of piece, under table figure background, the base map sequence of different levels shows, and forms unique animation effect；
It is provided by the invention that hiding figure manufacturing process is made based on direct modified high-fidelity hiding figure number net hanging method and system
Simply, do not change former plate-making, printing technology, do not use special consumptive material, do not increase printing cost additionally, just solved in printing
Figure problem is hidden, print post-processing is not needed；
It is provided by the invention that various printings are suitable for based on the digital net hanging method of directly modified high-fidelity hiding figure and system
The configuration of surface of technology, various printing elements, various substrates；
It is provided by the invention that base is also particularly suitable based on direct modified high-fidelity hiding figure number net hanging method and system
It is made in the hiding figure for being periodically detected diaphragm, can will hide clarity, the contrast optimization of figure, the quality without damaging table figure.
Detailed description of the invention:
Fig. 1 is the embodiment of the present invention based on the directly digital net hanging method flow chart of modified high-fidelity hiding figure；
Fig. 2 is monochromatic hiding figure linked network system flow chart in Fig. 1；
Fig. 3 is that image fault forecasting system and image compensation optimization system flow chart are printed in Fig. 1:
Fig. 4 is the structural block diagram that digital linked network system is schemed based on directly modified high-fidelity hiding of the embodiment of the present invention；
Fig. 5 is the structural block diagram that image fault prediction module is printed in Fig. 4；
Fig. 6 is the structural block diagram of image compensation optimization module in Fig. 4；
Fig. 7 is the output result schematic diagram that figure net hanging method is routinely hidden in the embodiment of the present invention；
Fig. 8 is that monochromatic high-fidelity hiding figure number linked network system is that the output result after offset printing optimization is shown in the embodiment of the present invention
It is intended to；
Fig. 9 is the output knot that monochromatic high-fidelity hiding figure number linked network system is after static dump optimization in the embodiment of the present invention
Fruit schematic diagram.
In figure: 401, color separation module；402, linked network module；403, site modulation module；404, printing image fault prediction
Module；4041, site input module one after modulating；4042, printing parameter module；4043, compare parameter setting module；4044,
Comparison algorithm module；4045, distorted result output module；405, image fault compensation optimizing module；4051, site is defeated after modulating
Enter module two；4052, distorted result input module；4053, Optimal Parameters setup module；4054, optimization algorithm module；4055,
Optimize site output module；406, optimum results determination module；407 Plate making printing modules；A1, background one；A2, conventional linked network the
One output area；A3, the second output area of conventional linked network；B1, background two；B2, high-fidelity offset printing optimize the first output area；B3, Gao Bao
True offset printing optimizes the second output area；C1, background three；C2, the first output area of high-fidelity static printing optimization；C3, high-fidelity static
The second output area of printing optimization.
Specific embodiment:
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
One kind scheming digital net hanging method based on directly modified high-fidelity hiding, as shown in Figure 1, be the flow chart of this method,
In the present embodiment, a width base map, Zang Tuhou, the defect that table figure is visible by naked eyes, table graph coloring rank are hidden under a full-color table figure
Range can be 0~100%, and the color range range of base map is also possible to 0~100%, in 10~90% range of table graph coloring order range
Interior, base map clearly can detect, and it is described that the specific method is as follows.
S101, the full-color color table figure of input, a width gray scale base map and setting parameter, wherein base map parameter includes the number of plies of base map
1 layer, gray level image, 0 degree of angle, magenta layer, site frequency 1591pi.
S102, it is required to carry out color separation to table figure according to corresponding print system, obtains each monochromatic table figure, it will in the present embodiment
Color table figure presses CMYK color separation, is divided into the monochromatic table figure of green, pinkish red, yellow, black four Essential colour.
S103, by each monochromatic table figure after color separation, routinely digital net suspension mode carries out hiding figure, each achromatic map linked network mistake
Journey has the corresponding color base map and parameter input respectively, and specific steps are as shown in Figure 2, comprising: S201, according to parameter to table figure into
Row routine linked network；S202, setting modulation parameter is required according to base map and relevant parameter to the table figure lattice point structure of formation；S203,
Determine table figure site modulation system；S204, site modulation is carried out, completes hiding figure；S205, the corresponding rasterizing of each monochrome of output are high
The halftone screen point diagram of resolution ratio.In the present embodiment, cyan, yellow, black monochromatic are schemed without hiding, are not required to modulate, pinkish red monochrome has
Hiding figure requires, and requires to carry out site modulation according to base map and relevant parameter to pinkish red monochromatic table figure lattice point structure, completes hiding figure, adjust
Method choice site processed phase-modulation.
The process of linked network is exactly the information processing that will be inputted, the rasterizing for Plate making printing after exporting color separation
Halftoning file, but the multilated of the lattice point structure in half-tone at this time, directly output can be defective.
S104, the high-resolution halftone screen point diagram of the corresponding rasterizing of each monochrome exported after being modulated in step S103
A printing image fault forecasting system is inputted, from existing digital network dotted state, according to different mode of printings, prediction is each
Distortion image quality after monochromatic halftone screen point diagram printing, makes including possible after table plot quality, the quality of each layer base map, printing
The various aspects such as the position for the table figure defect that the image deflects of generation, table figure site may cause after being upset by base map and the extent of damage
Assessment.
Image fault forecasting system is printed using one group of Prediction Parameters come control forecasting mode and prediction target, the present embodiment
Prediction Parameters i.e. its value include table figure color separation parameter be that 4 colors, table figure resolution ratio 150dpi, table figure brightness and contrast are covered entirely
Lid, base map mode are gray scale, base map chromatograph is magenta, base map contrast is the 70% of maximum possible contrast, modulation system choosing
Select site phase-modulation, plate-making mode selects CTP, mode of printing selects offset printing, substrate selects art paper etc..Using artificial intelligence
Image fault prediction algorithm is printed, the table figure site distortion factor that each halftoning color separation file is likely to occur is predicted, it is described
The process of prediction is carried out using image recognition, machine learning or other intelligent algorithm models.
S105, the defect parameters that step S104 forecast assessment obtains are transmitted to an image compensation optimization system, according to scarce
It falls into parameter and existing site state compensation optimizing is made to prediction defect and determine, some or certain pixels is white or by white by blacking
Halftone screen point diagram is carried out corresponding Optimization Compensation by blackening.
Image compensation optimization system controls its function, the Optimal Parameters and its value of the present embodiment by one group of Optimal Parameters
80 weights, base map point are weighed including table figure resolution ratio weight 80, table graph coloring coloured silk weight 80, table figure luminance weights 80, table figure color transition
Resolution weight 20, base map luminance weights 20 etc..Using artificial intelligence image compensation optimization algorithm, to each halftoning predicted point
Color file optimizes compensation.
S106, optimized compensated optimum results are determined, if meeting default Optimal Parameters requirement, this implementation
Preset optimization aim is the distortion factor less than 5% in example, then each monochromatic high-fidelity halftone screen figure containing base map is obtained, under
Otherwise the output of step S105 is fed back to step S104 again by one step, re-start prediction, compensation optimizing and judgement, until
Until meeting parameter preset requirement.
Step S104, the flow chart of S105 and S106 is as shown in Figure 3.
Hiding figure usually may cause two class defects to the modulation of lattice point structure, and the first kind is direct caused by half-tone picture
Defect, this kind of defect can identify on half-tone picture, that is to say, that even ideally absolutely not printing out to distortion
Come, defect there is also.To this first kind defect, it is necessary to be corrected.Second class defect is can not directly to do to sentence in half-tone picture
Other, it is the different print system as caused by the distortion of print system and the upset interaction of lattice point structure, as a result not
Together.This second class defect should accurately be compensated on digital halftone net figure for setting print system.The present invention couple
The correction-compensation of two kinds of defects is all suitable for, and can be distinguished correction-compensation to both defects, can also be completed at the same time.
Distortion prediction and correction-compensation can not consider that color overlapping independently executes each monochrome, and advantage is arithmetic speed
Fastly.It is also contemplated that color is overlapped, Comprehensive Evaluation made to each monochrome of image, cooperates with correction-compensation, advantage be result more
Precisely, but arithmetic speed is slow.Generally, the compensated result of monochromatic independent optimization can be met the requirements.
A kind of more superior implementation method be in conjunction with both advantage, then first each monochromatic independent optimization compensation examines again
Consider color overlapping, Comprehensive Evaluation and amendment.
It is executed by the circulation of step S104, S105 and S106, has obtained the height containing base map of each monochromatic (Essential colour)
Fidelity halftoning digital network figure prints, the excellent effect of high-fidelity table figure and base map respectively if monochromatic, but by each monochromatic chromatography
After, since site is overlapped, the complicated variation of lattice point structure may be brought to the color rendition of table figure some is not easy prediction
As a result, moir patterns, the color noise of such as polychrome interference, therefore, also needed sometimes to after each monochromatic chromatography it is possible that
Distortion situation further predicted and compensation optimizing, utmostly reduce the table figure distortion factor.
S107, obtained each monochromatic high-fidelity halftone screen figure containing base map is inputted into printing image fault prediction system again
System, carries out colour superimposition calculating, and the possible defect of color and Biao Tu multilated site of counterweight poststack printing image is made
Forecast assessment.
S108, calculated according to colour superimposition after the obtained defect parameters of forecast assessment, done in image compensation optimization system
Compensation optimizing determines out, carries out corresponding Optimization Compensation to each monochromatic high-fidelity halftone screen figure containing base map, optimization herein
Target uses color distortion degree as main criterion, when the distortion factor is less than 5%, that is, meets optimization aim, otherwise needs weight
Multiple prediction and optimization process finally export the optimization halftone screen point diagram of each monochrome until meeting default optimization aim.
In advance proper can be carried out in the digital site stage by printing image fault forecasting system and image compensation optimization system
To the compensating approach of benefit, so that the halftone screen point diagram optimized, reaches optimal printing image output.
S109, the optimization halftone screen point diagram of S108 output is inputted into Plate making printing system, obtained full-color containing base map
High-fidelity printed matter.
After digital halftone half-tone is formed, need to complete print by the corresponding follow-up work program of various printing technologies
Brush, thus printed matter of the output containing hiding figure, common printing technology has lithographic plate, intaglio plate, relief printing plate, offset printing, flexo, gravure, swashs
Optical pressure print etc.；Traditional printing mode can also first laser photo-typesetting, export the film, reprocessing plate-making, chromaticity printing, novel modern times
System mostly uses no film directly to make a plate (CTP), then chromaticity printing.Digital printing system then directly exports print pictures.
At this point, the Biao Tuli of printing hide when containing linked network into the stealthy base maps of one or more can be with if necessary to detect
It selects and hides fashionable corresponding detection means, such as machine recognition, scanning, special lighting, special observation angle, special optical
Tool etc. carrys out the base map of detection of concealed.A kind of most commonly seen hiding figure and detection method are covered with a kind of transparent optical film or plate
On Gai Biao figure, when position angle is suitable, hiding figure will be displayed.
One kind scheming digital linked network system based on directly modified high-fidelity hiding, as shown in figure 4, the system specifically includes: point
Color module 401, linked network module 402, site modulation module 403, printing image fault prediction module 404, image fault compensation are excellent
Change module 405, optimum results determination module 406 and Plate making printing module 407.
Color separation module 401, the table figure for that will input carry out color separation, obtain each monochromatic table figure.
Linked network module 402, for table figure monochromatic each of after 401 color separation of color separation module to be carried out conventional linked network respectively.
Site modulation module 403 sets modulation parameter, determines for according to the figure of base map and hiding the specific requirement of figure
Modulation system carries out site modulation, completes hiding figure, exports the corresponding high-resolution halftoning digital network of rasterizing of each monochrome
Figure.
Image fault prediction module 404 is printed, half color of each monochrome for being formed after modulating to site modulation module 403
It adjusts digital network figure in the case where setting mode of printing, parameter is required according to preset print system parameter and table plot quality, after printing
Issuable distortion carries out forecast assessment, and each monochromatic high-fidelity halftone screen figure containing base map for being also used to obtain is by face
The possible defect of color and Biao Tu multilated site of color overlapping calculation, counterweight poststack printing image is made prediction assessment.
As shown in figure 5, printing image fault prediction module 404 specifically includes: site input module 1 after modulation is used
The halftoning digital network figure exported after receiving site modulation module 403 and modulating, as printing image fault prediction module 404
Input quantity；Printing parameter module 4042, for setting mode of printing and parameter；Compare parameter setting module 4043, for being arranged
The Comparative indices of the table figure after halftone screen figure and hiding figure before original table figure or hiding figure；Comparison algorithm module 4044, for setting
Determine comparison pattern and comparative approach, the table figure after comparing hiding figure and the halftone screen figure before original table figure or hiding figure；Distorted result
Output module 4045, the distortion prediction result obtained for exporting comparison algorithm module 4044.
Image fault compensation optimizing module 405, the assessment parameter for being obtained according to printing image fault prediction module 404
And existing site state, each monochromatic halftoning digital network figure is subjected to corresponding Optimization Compensation, is also used to according to colour superimposition meter
The parameter that forecast assessment obtains after calculation carries out corresponding Optimization Compensation to each monochromatic high-fidelity halftone screen point diagram containing base map,
Each monochromatic high-fidelity halftone screen point diagram advanced optimized.
As shown in fig. 6, image fault compensation optimizing module 405 specifically includes: site input module 2 4051 after modulation is used
The halftoning digital network figure exported after receiving the site modulation module 403 and modulating, as image fault compensation optimizing module
405 input quantity；Distorted result input module 4052 measures in advance for receiving in printing image fault prediction module 404
The distortion prediction that arrives is as a result, another input quantity as image fault compensation optimizing module 405, the i.e. foundation of Optimization Compensation；
Optimal Parameters setup module 4053, for the relevant parameter during Optimization Compensation to be arranged；Optimization algorithm module 4054 is used for root
Site input module 2 4051 after modulation is connect according to the distortion prediction result predicted in printing image fault prediction module 404
The halftoning digital network figure of receipts optimizes compensation；Optimize site output module 4055, for obtaining optimization algorithm module 4054
To Optimization Compensation after halftoning digital network figure export to the optimum results determination module 406.
Optimum results determination module 406, for determining the halftoning after 405 Optimization Compensation of image fault compensation optimizing module
Whether digital network figure reaches default optimization aim, if reaching requirement, each monochromatic half color of high-fidelity containing base map that will obtain
The output of digital network figure is adjusted, otherwise, the halftoning digital network figure after preliminary Optimization Compensation is returned into printing image fault prediction module
404。
Plate making printing module 407 carries out plate-making print for final each monochromatic halftone screen point diagram output after optimizing
Brush.
The two class defects that the present invention usually may cause hiding figure to the modulation of lattice point structure are all suitable for, to both defects
Correction-compensation can be distinguished, can also be completed at the same time.
As shown in Figure 7, Figure 8 and Figure 9, it is shown that the effect of digital linked network system is schemed in monochromatic high-fidelity hiding.Fig. 7 is a kind of normal
The output by the mobile hiding figure net hanging method for realizing site phase-modulation in site of rule, is placed in one in a uniform background
A circular base map.A1 is background one, and in the area A2 and A3, the coverage rate of site is clearly lower or higher than that background is too many, and quality is not
It is acceptable.The mainly first kind defect that Fig. 7 is shown.
Fig. 8 is the output after monochromatic high-fidelity hiding figure number linked network system optimizes for offset printing.Since offset printing distortion is small, from number
Word site needs the amplitude very little of correction-compensation to printed matter output, so, from digital site, the area B1, B2 and B3 has very
Similar coverage rate, after printing, fidelity is high, and there is identical brightness in the area B1, B2 and B3, and hiding figure will not be identified visually.Fig. 8
Result after mainly display first kind defect is corrected.
Fig. 9 is that the output and offset printing after monochromatic high-fidelity hiding figure number linked network system optimizes for static dump have two o'clock not
Together, first, dot area coverage is low, this is because the distortion of static dump time point is big, the diffusion of point is big, in order to reach correct print
Brushing degree, the diffusion that the present embodiment especially puts the distortion of site in optimization are compensated.The net of second, C2 and the area C3
Dot coverage is unequal with C1.This also in that compensation as a result, frequency (or the density, i.e. unit area of the area C2 and C3 site
The quantity of site) it is more high or low than C1, diffusion of the site in printing process is directly proportional to frequency, therefore, the area C1, C2 and C3 difference
Obtain different correction values.So although there is different coverage rates in C1, the area C2 and C3 on the halftone screen figure of optimization,
On the printed matter after print system the output for printing by setting, C1, the area C2 and C3 has same brightness, to realize print
The high-fidelity of brush product hides figure.Therefore, Fig. 9 not only shows the amendment to first kind defect, but also containing for static dump
The second class defect compensation result.
It is provided by the invention to be based on the digital net hanging method of directly modified high-fidelity hiding figure and system, by establishing one certainly
Digital linked network system is schemed in dynamic high-fidelity hiding, using direct modified mode, according to base map and setting parameter, to table figure directly into
The site modulation of the various modes of row, then by printing image fault forecasting system and image compensation optimization system, after modulation
Table figure half-tone carry out distortion prediction and carry out mend optimization repay, in the case where guaranteeing table figure high-fidelity, in the coloured silk of high-quality
Multilayer high definition, multi-level gray scale base map is hidden under color table figure.
It is provided by the invention that table figure can be effectively improved based on direct modified high-fidelity hiding figure number net hanging method and system
Quality expands the Application Range of table figure；Make that suppressible base map modulation amplitude is big, contrast is high, good visual effect, resolution ratio
Height, base map can be the text or image of very little, Zang Tuhou, base map high definition, the close inspection piece line number of resolution ratio；Can effectively improve can
For hiding the color range range of the table figure of figure, can in panchromatic order range high-fidelity hiding figure, can guarantee 5% to 90% as it can be seen that 10%
It is clear to 80%, base map can also be hidden in several different color ranges or continuously cover certain color range range, preferably greatly
In 20% color range range, for example, from 30% to 70%, for another example from 15% to 40%, to improve the efficiency of anti-imitation；No
It is influenced by specific hiding figure modulation system, various hiding drawing methods is applicable in, various ways can be carried out to a certain color separation
Hybrid multilayer hiding figure, including but not limited to site phase-modulation and angle of halftone screen line are modulated and use, site phase-modulation and site shape
Shape modulation and use, multi-angle site phase-modulation, leggy site phase-modulation, multi-frequency site phase-modulation etc.；It can be right
Clarity and contrast when each layer base map detects make control independently, have it will be apparent that also have it is hiding very it is deep not
Easy illusion, thus, the counterfeit protection measures of different levels are provided, the anti-fake demand of different levels is met；It can be by a base map point
It at several parts, is ensconced in several monochromes respectively, in this case, only detection diaphragm detects to ensconce each monochrome simultaneously
In spirte and synthesis display, base map can just display；Three-dimensional base map can be hidden under table figure, by detecting accordingly
Means can show stereoscopic effect；Piece can also be being examined when respective angles are fixed by the base map of hiding specially treated, with
The angle of illumination and the variation at visual angle, generate different effects；It can also be by the rotation of inspection piece or translation, in table figure background
Under, the base map sequence of different levels shows, and forms unique animation effect；Keep hiding figure manufacturing process simple, do not change former plate-making,
Printing technology does not use special consumptive material, does not increase printing cost additionally, just solves the problems, such as hiding figure in printing, does not need to print
Post-processing；Suitable for various printing technologies, the configuration of surface of various printing elements, various substrates, wherein printing technology include but
It is not limited to intaglio printing, letterpress, lithographic printing, porous printing, the offset printing, flexo, screen printing of conventional graphic arts printing technology
Brush etc., the ink-jet of digital printing technology, electrostatic, thermal transfer, heat sublimation, silver salt flushing etc., the label printing of specialty printing, round tube
Printing etc., printing element include but is not limited to all kinds of paper, cardboard, corrugated board, soft and hard plastic, composite material, organic material,
Metal, alloy, metal foil, glass, timber, leather, special cloth etc., and figure can be hidden in plane or curved surface and gone back
It is former；It is also particularly suitable and is made based on the hiding figure for being periodically detected diaphragm, can will hide the clarity of figure, contrast optimization (is adjusted
Amplitude processed is big), the quality without damaging table figure.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and the claims in the present invention are limited
Fixed range.
Claims (12)
1. one kind schemes digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that this method comprises:
(a) input table figure and at least one base map；
(b) it is required to carry out color separation to the table figure according to the print system of setting, obtains each monochromatic table figure；
(c) each monochromatic table figure after color separation is subjected to conventional numerical linked network, obtains each monochromatic halftone screen figure；
(d) according to the specific requirement of the figure of base map and hiding figure, modulation parameter is set, modulation system is determined, to the institute after linked network
It states at least one of each monochromatic halftone screen figure to be modulated according to base map by setting means, exports its corresponding hiding figure modulation
Halftone screen figure afterwards；
(e) according to setting mode of printing and parameter, at least one hiding scheme after modulated halftone screen figure printing there may be
Distortion carry out forecast assessment, while by obtained each monochromatic halftone screen figure containing base map by colour superimposition calculating, counterweight
The possible defect of color and Biao Tu multilated site of poststack printing image is made a prediction assessment；
The forecast assessment method particularly includes: setting mode of printing and parameter are arranged original table figure or hide the halftoning before figure
The Comparative indices of net figure and the table figure after hiding figure, the table figure and original table figure after comparing hiding figure or the halftone screen figure before hiding figure,
Then the distortion prediction result compared is exported；
(f) each monochromatic halftoning digital network figure is carried out corresponding optimization and mended by the assessment parameter obtained according to the forecast assessment
It repays, the halftone screen figure after obtaining the independent compensation of each monochrome comprising respective base map, while after being calculated according to colour superimposition in advance
The parameter estimated of testing and assessing obtains the comprehensive of each monochrome to each monochromatic corresponding Optimization Compensation of halftone screen figure progress containing base map
Close compensated halftone screen figure；When the Optimization Compensation, the relevant parameter during Optimization Compensation is first set；
(g) determine whether the halftoning digital network figure after Optimization Compensation reaches default optimization aim, if reaching requirement, will
Each monochromatic compensated halftoning digital network figure output containing base map arrived, executes step (h), otherwise, after Optimization Compensation
Halftoning digital network figure return step (e)；
(h) the halftone screen figure after Optimization Compensation is exported, Plate making printing is carried out.
2. according to claim 1 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that in institute
After stating step (g), the halftone screen figure after the Optimization Compensation is completed into printing by setting mode of printing.
3. according to claim 1 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that if
The table figure is color image, and the table figure is divided into RGB trichromatic diagram or tetra- chromatic graph of CMYK in the step (b) or other are more
Chromatic graph or the polychrome figure for adding other spot colors；If the table figure is grayscale image, the table figure described in the step (b) only has black
A kind of chromatic graph.
4. according to claim 1 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that described
Conventional numerical net suspension mode is based on periodic, acyclic or random site or cable.
5. according to claim 1 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that described
Hiding figure modulation system includes being modulated to some or multiple attributes of site or cable by base map, and the attribute includes angle
Degree, phase, size, shape, density, frequency, position and gray scale.
6. according to claim 1 or 2 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that
The mode of printing that sets is intaglio printing, letterpress, lithographic printing, porous printing, offset printing, flexo, silk-screen printing, spray
Ink, electrostatic, thermal transfer, heat sublimation or silver salt rinse.
7. according to claim 1 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that described
Image quality distortion and the prediction of table figure defect are to carry out independent prediction respectively to each monochromatic halftone screen figure, or to multiple monochromes
Halftone screen figure prints the integrated forecasting of the cross-color defect of image after colour superimposition.
8. according to claim 1 or claim 7 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that
The process of the prediction is predicted using image recognition, machine learning or other intelligent algorithm models.
9. according to claim 1 or claim 7 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that
The image quality distortion and the prediction of table figure defect carry out control forecasting mode by using one group of Prediction Parameters and predict target, described
Prediction Parameters include table figure color separation parameter, table figure resolution ratio, the brightness of table figure, table figure contrast, table graph parameter Permit interference degree, bottom
Chart-pattern, base map chromatograph, base map resolution ratio, base map contrast, modulation system selection and mode of printing selection.
10. according to claim 1 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that institute
It states Optimization Compensation process and compensation is optimized using intelligent algorithm.
11. according to claim 1 scheme digital net hanging method based on directly modified high-fidelity hiding, which is characterized in that institute
It states Optimization Compensation process and controls its function by one group of Optimal Parameters, the Optimal Parameters include table figure resolution ratio weight, table figure
Color weight, table figure luminance weights, table figure color transition weight, base map resolution ratio weight and base map luminance weights.
12. one kind schemes digital linked network system based on directly modified high-fidelity hiding, which is characterized in that the system includes:
Color separation module (401), the table figure for that will input carry out color separation, obtain each monochromatic table figure；
Linked network module (402), for each monochromatic table figure to be carried out conventional linked network respectively；
Site modulation module (403) sets modulation parameter, determines and adjust for according to the figure of base map and hiding the specific requirement of figure
Mode processed, is modulated, and exports the corresponding halftoning digital network figure of each monochrome；
It prints image fault prediction module (404), exists for the halftoning digital network figure to each monochrome formed after modulation
It sets under mode of printing, forecast assessment is carried out to distortion issuable after printing, be also used to each monochromatic containing base map by what is obtained
Halftone screen figure by colour superimposition calculate, counterweight poststack print image color and Biao Tu multilated site it is possible
Defect is made a prediction assessment；
Image fault compensation optimizing module (405), the assessment for being obtained according to printing image fault prediction module (404)
Each monochromatic halftoning digital network figure is carried out corresponding Optimization Compensation, obtains the independence of each monochrome comprising respective base map by parameter
Compensated halftone screen figure, the parameter that forecast assessment obtains after being also used to be calculated according to colour superimposition, to each monochromatic containing base map
Halftone screen figure carry out corresponding Optimization Compensation, the halftone screen figure after obtaining the comprehensive compensation of each monochrome；
Optimum results determination module (406), for determining whether the halftoning digital network figure after Optimization Compensation reaches default optimization
Target exports obtained each monochromatic compensated halftoning digital network figure containing base map if reaching requirement, otherwise, will
Halftoning digital network figure after Optimization Compensation returns to the printing image fault prediction module (404)；
Plate making printing module (407), for carrying out Plate making printing for each monochromatic halftone screen figure output after Optimization Compensation；
The printing image fault prediction module (404) includes:
Site input module one (4041) after modulation, for receiving half color exported after site modulation module (403) modulation
Digital network figure is adjusted, the input quantity as printing image fault prediction module (404)；
Printing parameter module (4042), for setting mode of printing and parameter；
Compare parameter setting module (4043), for the halftone screen figure before original table figure or hiding figure and the table figure after hiding figure to be arranged
Comparative indices；
Comparison algorithm module (4044), for comparing the halftone screen figure before the table figure after hiding figure and original table figure or hiding figure；
Distorted result output module (4045), the distortion prediction result obtained for exporting comparison algorithm module (4044)；
Described image distortion compensation optimization module (405) includes:
Site input module two (4051) after modulation, for receiving half color exported after site modulation module (403) modulation
Adjust digital network figure, an input quantity as described image distortion compensation optimization module (405)；
Distorted result input module (4052) is obtained for receiving prediction in printing image fault prediction module (404)
Distortion prediction as a result, another input quantity as described image distortion compensation optimization module (405), i.e., Optimization Compensation according to
According to；
Optimal Parameters setup module (4053), for the relevant parameter during Optimization Compensation to be arranged；
Optimization algorithm module (4054), for according to the distortion that prediction obtains in printing image fault prediction module (404)
Prediction result optimizes compensation to the received halftoning digital network figure of site input module two (4051) after the modulation；
Optimize site output module (4055), half color after Optimization Compensation for obtaining the optimization algorithm module (4054)
Digital network figure is adjusted to export to the optimum results determination module (406).
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| CN107590839B (en) * | 2017-09-18 | 2021-08-24 | 臧戈平 | High-fidelity hidden picture-based tracing anti-counterfeiting method |
| CN107578079B (en) * | 2017-09-18 | 2020-04-21 | 臧戈平 | Anti-counterfeiting method for high-fidelity hidden picture in information code area |
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