CN107330188A - Towards the multi-color halftone disassembled asset formula modeling method and system for replicating object - Google Patents
Towards the multi-color halftone disassembled asset formula modeling method and system for replicating object Download PDFInfo
- Publication number
- CN107330188A CN107330188A CN201710519743.3A CN201710519743A CN107330188A CN 107330188 A CN107330188 A CN 107330188A CN 201710519743 A CN201710519743 A CN 201710519743A CN 107330188 A CN107330188 A CN 107330188A
- Authority
- CN
- China
- Prior art keywords
- color
- models
- modeling
- module
- ink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Computer Hardware Design (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Spectrometry And Color Measurement (AREA)
- Facsimile Image Signal Circuits (AREA)
- Color Image Communication Systems (AREA)
- Image Processing (AREA)
Abstract
It is a kind of to enumerate form to split into some four color models comprising black ink towards the multi-color halftone disassembled asset formula modeling method and system that replicate object, including by multi-color halftone equipment；Using Nie Gebaier primary colours step-wedges prepared by ink amount limitation modeling process, each four color models colour gamut is obtained by algorithm of convex hull；Color domain coverage ratio of the different four color models combinations for image to be copied is obtained using colour gamut determination methods, and principle is turned to color domain coverage ratio maximum, determines that four color models are combined；Meet the situation of condition requirement simultaneously for multigroup combination that may be present, method is minimized using center aberration, determine that the color model of final optimal four is combined, complete the modeling of disassembled asset formula.The present invention under conditions of without appended sample preparation process, realizes the simplification of multi-color halftone equipment Holistic modeling flow by aberration sample prepared by ink amount limit procedure, and easy to implement.
Description
Technical field
The invention belongs to halftoning apparatus Color Replication technical field, and in particular to a kind of towards the polychrome half for replicating object
Tone disassembled asset formula modeling method and system.
Background technology
Multi-color halftone Color Replication technology is the mainstream technology that current image replicates field.Technique is intended to set up former
The relevance model (i.e. chromatic characteristic model) that beginning image data is inputted between controlling value and equipment output color value, Jin Ershi
Now replicate the accurate control of color.Compared to conventional four-color (CMYK) reproduction technology, polychrome reproduction technology has colour gamut broadness, layer
The advantage such as secondary abundant, details is clear.
In above-mentioned characterization model construction process, because more color device mass colour dimension is higher, if carrying out overall build to it
Mould often faces the problem of sampled pressure is huge.If therefore, common method is to be converted to more color device modeling problem at present
Dry three colors or four dice equipment modeling problems.Compared to higher-dimension Holistic modeling, above-mentioned split-type modeling method significantly improves many
Color device color characterizes the modeling efficiency of model.
However, due to submodel model aspect, high accuracy characterize modeling realization be also using high-density sampling before
Carry, therefore on the basis of above-mentioned split-type modeling method, it is still relatively complicated mistake that high accuracy modeling is carried out to more color device
Journey.
Bibliography 1：Wang B,Xu H,Luo MR,et al.Maintaining accuracy of cellular
Yule–Nielsen spectral Neugebauer models for different ink cartridges using
principal component analysis.JOSA A 2011；28:1429-1435.
Bibliography 2：Liu Q,Wan X and Xie D.Optimization of spectral printer
modeling based on a modified cellular Yule–Nielsen spectral Neugebauer
model.JOSA A2014；31:1284-1294.
Bibliography 3：Wang B,Xu H,Luo MR,et al.Spectral-based color separation
method for a multi-ink printer.Chinese Optics Letters 2011；9:063301.
In fact, in actual applications, respectively having feature due to replicating object own color feature, for certain applications
(for example, preparing the colors such as skin-color colour atla, cosmetics colour atla, ancient painting duplication constitutes more single duplication object) simultaneously need not
The modeling of full gamut aspect is carried out to more color device.Therefore, if can be built by ad hoc approach towards duplication object color feature
Characterization model, then can not only significantly improve overall permanenceization modeling efficiency, can also on this basis pass through increase
The modes such as specific submodel modeling sample sampling density, further lift modeling accuracy.However, by host and guests such as theoretical method levels
The restriction of sight factor, for problem above, academic circles at present not yet proposes effective workaround with industrial quarters.
The content of the invention
The invention aims to solve problem described in background technology, propose a kind of towards the polychrome half for replicating object
Tone disassembled asset formula modeling method and system.
The technical scheme is that provide a kind of towards the multi-color halftone disassembled asset formula modeling method for replicating object,
Comprise the following steps：
Step 1, multi-color halftone equipment is split into M four color models to enumerate form, wherein each model is all containing black
Chromatic ink；
Step 2, based in step 1 four color models, T grades of Nie Gebaier step-wedges are prepared, and pass through Visual Observations Observations method
Reject ink and measure the sample that transfinites, and complete equipment ink amount limitation on this basis；
Step 3, using color measuring apparatus, Nie Gebaier step-wedges sample color information in measuring process 2, and reject corresponding
Ink measures the sample color data that transfinite；
Step 4, based on step 3 measures gained color data, four color models in algorithm of convex hull calculation procedure 1 are utilized
Gamut volume；
Step 5, on the basis of the calculating of step 4 gamut volume, the four color model groups that enumerative technique computation model quantity is N are passed through
The gamut volume of conjunction, wherein N=1,2,3,4；Then, for any image to be copied, each four are judged using colour gamut determination methods
Color domain coverage ratio G of the corresponding colour gamut of color model combination for image to be copied；
Step 6, principle is turned to four color models combination color domain coverage ratio G maximums in step 5, determines that four color models are combined；
Step 7, if the combination of an only group model meets condition in step 6, it is optimal fractionation；If existing in step 6
Multigroup combination meets desired situation simultaneously, then image to be copied is carried out into resampling first, its pixel quantity is down to Q,
Q pixel of subsequent calculating is combined with N number of four color model selected by step 6 between color-values corresponding to black quantity space midpoint W
Average color difference C, and foundation is minimised as with average color difference C, chooses final four color models combination, complete to split modeling.
Moreover, Nie Gebaier step-wedges series T should be greater than 20 in step 2.
Moreover, measurement gained color information should be spectral reflectivity information or chrominance information in step 3.
Moreover, when asking for color domain coverage ratio G in step 5, it should be attempted model quantity N is ascending, if in N=
NoptDuring ＜ 4, G=100% need not then attempt N ＞ NoptCombined situation.Wherein, color domain coverage ratio G solution is calculated using inhull
Method, its value is equal to image to be copied and is located at the ratio that four color models combine pixel count and image total pixel number in colour gamut.
Moreover, pixel quantity Q value is 100 ＜ Q ＜ 200 in step 7, and the black quantity space midpoint W of four color models
It is defined as the point that each dimension value of ink amount is 50.
Moreover, average color difference C solution should use CIEDE2000 colour difference formulas in step 7, using D50/2 chrominance requirements
Calculated.
The present invention provides a kind of towards the multi-color halftone disassembled asset formula modeling for replicating object, including following mould
Block：
Device enumeration splits module, multi-color halftone equipment is split into M four color models to enumerate form, wherein each mould
Type all contains black ink；
Ink amount limitation module, is split in module based on four color models by device enumeration, prepares T grades of Nie Gebaier step-wedges,
And the sample that transfinites is measured by Visual Observations Observations method rejecting ink, and completion equipment ink measures limitation on this basis；
Color measuring module, using color measuring apparatus, measurement ink amount limits Nie Gebaier step-wedge sample colors in module
Information, and the corresponding ink of rejecting measures the sample color data that transfinite；
Gamut volume computing module, based on color measuring module measures gained color data, utilizes algorithm of convex hull meter
Calculate the gamut volume that device enumeration splits four color models in module；
Color domain coverage ratio computing module, on the basis of the calculating of gamut volume computing module gamut volume, passes through enumerative technique meter
Calculate the gamut volume that model quantity combines for N four color models, wherein N=1,2,3,4；Then, for any image to be copied,
Judge color domain coverage ratio G of each corresponding colour gamut of four color models combination for image to be copied using colour gamut determination methods；
Four colour cells close primary election module, are maximized with four color models combination color domain coverage ratio G in color domain coverage ratio computing module
For principle, determine that four color models are combined；
Four colour cells close whole modeling block, if four colour cells, which close only group model combination in primary election module, meets condition, it is
It is optimal to split；If four colour cells, which are closed, has that multigroup combination is required while meeting in primary election module, first by figure to be copied
As carrying out resampling, its pixel quantity is set to be down to Q, then Q pixel of calculating and four colour cells close the N selected by primary election module
Average color difference C between color-values corresponding to the black quantity space midpoint W of individual four color model, and foundation is minimised as with average color difference C,
Final four color models combination is chosen, completes to split modeling.
Moreover, Nie Gebaier step-wedge series T should be greater than 20 in ink amount limitation module.
Moreover, measurement gained color information should be spectral reflectivity information or chrominance information in color measuring module.
Moreover, when color domain coverage ratio G is asked in color domain coverage ratio computing module, should be by the ascending progress of model quantity N
Attempt, if in N=NoptDuring ＜ 4, G=100% need not then attempt N ＞ NoptCombined situation.Wherein, color domain coverage ratio G solution
Using inhull algorithms, its value is equal to the pixel count and image total pixel number that image to be copied is located in four color models combination colour gamut
Ratio.
Moreover, the value that four colour cells close pixel quantity Q in whole modeling block is 100 ＜ Q ＜ 200, and four color models ink amount
Space midpoint W definition is the point that each dimension value of ink amount is 50, and the solution that four colour cells close average color difference C in whole modeling block should be adopted
CIEDE2000 colour difference formulas are used, are calculated using D50/2 chrominance requirements.
Compared with prior art, beneficial effects of the present invention are as follows：
It is proposed by the present invention a kind of towards the multi-color halftone disassembled asset formula modeling technique scheme for replicating object, it is innovative
Make use of ink amount limitation modeling process prepared by color sample so that by multi-color halftone equipment ink amount limit and split
Formula modeling process unites two into one, it is achieved thereby that the simplification of modeling process.The technical scheme passes through colour gamut determination methods, specific aim
Selection towards particular copy object optimal four color model combine, ensure Color Replication precision on the premise of, significantly improve
The modeling efficiency of multi-color halftone device characterization process.Therefore, this method is efficiently solved towards the polychrome for replicating object
Halftoning apparatus splits modeling problem, and easy to implement, has stronger be applicable in multi-color halftone Color Replication technical field
Property.Because technical solution of the present invention has important application meaning, supported by multiple research projects：1. Shenzhen's basic research
Mesh JCYJ20150422150029093, the Wuhan City of 2. project of national nature science fund project 61505149,3. youth's morning twilight talent's meter
Draw 2016070204010111,4. Hubei Province Nsfc Projects 2015CFB204.Technical solution of the present invention is protected
China's relevant industries will be competed first place in the world significant by shield.
Brief description of the drawings
Fig. 1 is the flow chart of modeling method embodiment of the present invention；
Fig. 2 is the structured flowchart of modeling of the present invention.
Embodiment
It is described in detail below with reference to accompanying drawing there is provided the embodiment of the present invention.
It is a kind of towards the multi-color halftone disassembled asset formula modeling method for replicating object that embodiment as shown in Figure 1 is provided,
It can be realized high towards the multi-color halftone equipment for replicating object effectively using color sample prepared by equipment ink amount limit procedure
Effect splits modeling.Embodiment uses the mass-tones of Canon IPF5100 seven (CMYKRGB) wide format printer, with Epson Giclee
Rice paper is printing medium, using certain ancient painting duplicate spectrum picture as object is replicated, using disassembled asset method pair of the present invention
The seven mass-tones equipment is split.Meanwhile, will disassembled asset method conduct described in bibliography 1 and bibliography 3 above
Control.It should be noted that the invention is not limited in above-mentioned halftoning apparatus, printing medium and object is replicated, for it
Its equipment and duplication object, this method are equally applicable.
Technical solution of the present invention can be realized automatic by those skilled in the art using computer software technology when being embodied
Operation.The method flow that embodiment is provided comprises the following steps：
Step 1, multi-color halftone equipment to enumerate form split into M four color models, wherein each model is all containing black
Chromatic ink；Because M is chosen from multi-color halftone equipment, M is naturally larger than or equal to 4.
Seven mass-tones (CMYKRGB) printing device used for embodiment, because black ink K is essential option, therefore with
Enumerate four color model quantity of form fractionationIt is individual.
Based on step 2, in step 1 four color models, T grades of Nie Gebaier step-wedges are prepared, and pass through Visual Observations Observations method
Reject ink and measure the sample that transfinites, and complete equipment ink amount limitation on this basis, moreover, Nie Gebaier step-wedge series T should be greater than 20；
In embodiment, 20 four color models of gained are split for step 1,21 grades of Nie Gebaier step-wedges are prepared one by one.Its
In, Nie Gebaier step-wedges are known in the art.By taking monochromatic C as an example, its Nie Gebaier step-wedge is：C=0, C=5, C=10, C=
15 ... C=100；By taking double-colored C+M as an example, its Nie Gebaier step-wedge is C=M=0, C=M=5, C=M=10, C=M=15 ...
.C=M=100 by that analogy.Wherein, there is repetition due to corresponding to Nie Gebaier step-wedges in 20 four color models, therefore only need system
It is standbyGroup Nie Gebaier step-wedges.
In addition, " reject ink by Visual Observations Observations method and measure the sample that transfinites, and complete the limitation of equipment ink amount on this basis "
Prior art is similarly, be for details, reference can be made to：Liu Qiang, based on the maximized ink-jet print amount method for limiting research of spectral gamut,
Spectroscopy (in the present embodiment, by taking monochromatic C Nie Gebaier step-wedges as an example, passes through visual determination method with spectrum analysis (2013)
It was found that ink occurs at C=90 in ink measures the overflow problem that transfinites, then 85) its critical value is defined as
Step 3, using color measuring apparatus, Nie Gebaier step-wedge sample color information in measuring process 2, and reject corresponding
Ink measures the sample color data that transfinite, moreover, measurement gained color information should be spectral reflectivity information or chrominance information.
Embodiment uses Nie Gebaier prepared by X-rite Spectroscan type scanning spectrophotometers measuring process 2
Step-wedge spectral reflectivity information, wherein spectral reflectivity wave-length coverage are 400nm-700nm, and each according to being determined in step 2
Nie Gebaier primary colours step-wedge ink amount threshold value, deletes ink and measures the sample color information that transfinites.
Step 4 utilizes four color models in algorithm of convex hull calculation procedure 1 based on step 3 measures gained color data
Gamut volume；
In embodiment, because measurement gained spectral reflectance data dimension is higher (31 dimension) in step 3, therefore pass through color first
Degree conversion method is converted LAB chrominance spaces to D50/2, and using being obtained in algorithm of convex hull calculation procedure 1
The gamut volume of 20 four color models.Wherein, spectral reflectivity space is to the conversion of chrominance space, and algorithm of convex hull is all existing
There is technology, specifically can be found in respectively：Schanda J.CIE Colorimetry:Wiley Online Library；2007. with
And Barber CB, Dobkin DP, Huhdanpaa H.The quick hull algorithm for convex
hulls.ACM Transactions on Mathematical Software(TOMS).1996；22(4):469-83.
Step 5, step 4 gamut volume calculating on the basis of, pass through enumerative technique computation model quantity be N four color model groups
The gamut volume of conjunction, wherein N=1,2,3,4；Then, for any image to be copied, each four are judged using colour gamut determination methods
Color domain coverage ratio G of the corresponding colour gamut of color model combination for image to be copied；Moreover, when asking for color domain coverage ratio G, should be by mould
Type quantity N is ascending to be attempted, if in N=NoptDuring ＜ 4, G=100% need not then attempt N ＞ NoptCombined situation.Its
In, color domain coverage ratio G solution uses inhull algorithms, and its value is equal to image to be copied and is located in four color models combination colour gamut
The ratio of pixel count and image total pixel number.
In embodiment, as model quantity N=1, the combination of four color models is altogetherKind, its gamut volume is in step 4
In calculated, can be used directly.As model quantity N=2, the combination of four color models is altogetherKind, by that analogy.Embodiment
Used ancient painting duplicate spectrum picture size is 198*465 pixels (being only used for illustrating).When asking for color domain coverage ratio,
Using Inhull algorithms, each pixel of image to be copied is calculated one by one whether in the combination of certain four color model, and with figure to be copied
Image position defines color domain coverage ratio G in the ratio that four color models combine pixel count and image total pixel number in colour gamut.(wherein,
Inhull algorithms are field of Computer Graphics prior art, refer to D'Errico J.Inhull 2006:http://
Www.mathworks.com/matlabcentral/fileexchange/10226-inhul l.) practical operation when, by model
Quantity N is ascending to be attempted, and is found in NoptWhen=2, color domain coverage ratio need not attempt the feelings of N ＞ 2 i.e. up to 100%
Condition.
Step 6, with step 5 four color models combination color domain coverage ratio G maximums turn to principle, determine four color models combine；
In embodiment, the four color models combination for meeting color domain coverage ratio maximization (G=100%) has 3 groups：CMYK+
RGBK, BCGK+MRYK and RYGK+MRYK.
If the combination of an only group model meets condition in step 7, step 6, it is optimal fractionation；If existing in step 6
Multigroup combination meets desired situation simultaneously, then image to be copied is carried out into resampling first, its pixel quantity is down to Q,
Then calculate Q pixel and the black quantity space midpoint W of N number of four color model selected by step 6i(i=1,2..N) color corresponding to
Average color difference C between coloured silk value, and foundation is minimised as with average color difference C, final four color models combination is chosen, fractionation is completed and builds
Mould.Wherein, pixel quantity Q value is 100 ＜ Q ＜ 200, and black quantity space midpoint W definition is that each dimension value of ink amount is
50 point, average color difference C solution should use CIEDE2000 colour difference formulas, be calculated using D50/2 chrominance requirements.
Because totally 3 group of four color model combination meets color domain coverage ratio G=100% condition in step 6, therefore need to enter it
Row postsearch screening.First, to improve operation efficiency, original spectrum image is passed through into transverse and longitudinal from 198*465=92070 pixel sizes
The mode of every 25 pixel separation sampling, dimensionality reduction to 8*19=152 pixel sizes.Subsequently, for 3 group of four color model group in step 6
Close, calculate respectively 152 pixels and the model midpoint of the spectrum picture after dimensionality reduction color difference typical value (CIEDE2000 colour difference formulas,
D50/2 chrominance requirements).Wherein, by taking the color models of CMYK tetra- as an example, its model midpoint is C=M=Y=K=50 sample points.Wherein,
CIEDE2000 colour difference formulas are prior art, refer to Luo MR, Cui G, Rigg B.The development of the
CIE 2000colour‐difference formula:CIEDE2000.Color Research&Application.2001；
26(5):340-50.
It is computed, the average color difference result of calculation between 3 kind of four color model combination center and image to be copied is
CMYK+RGBK：DE2000=25.9
BCGK+MRYK:DE2000=19.7
RYGK+MRYK:DE2000=11.2
Therefore the combination of the color models of RYGK+MRYK tetra- is finally chosen, complete finally to split modeling.
Further to confirm that the inventive method is excellent in terms of the multi-color halftone disassembled asset modeling towards duplication object
Gesture, the inventive method is compareed with bibliography 1 of the present invention and the method therefor of bibliography 3.Wherein, contrast method is same
The color models of CMYKRGB seven are split as 5 group of four color model (CMYK, RMYK, CGYK, CMBK, RGBK) and 5 group of three color model by sample
(CMY,RMY,CGY,CMB,RGB).However, having above, it is known that the present invention can be achieved to replicate object only with 2 group of four color model
100% all standing of colour gamut, therefore compared to contrast method, context of methods can significantly reduce follow-up modeling work amount, be carried from it
High modeling efficiency.For example, exemplified by building 5 grades of sampling CYNSN and characterize model, contrast method need at least print 3750 colors
Sample, and context of methods at least only needs to print 1250 color cards.Adopted in fact, building 6 grades even with this method for splitting
Sample CYNSN models, also only need to print 2592 color cards, i.e., by such a increase Sampling series, reduce the side of model quantity
Method, can improve modeling accuracy while modeling efficiency is improved.Wherein, CYNSN models are that half-tone response field is existing
Technology, its modeling accuracy year Sampling series increase and improve, can specifically participate in aforementioned reference 1-3.
The present invention also provides a kind of towards the multi-color halftone disassembled asset formula modeling for replicating object, including following mould
Block：
Device enumeration splits module, multi-color halftone equipment is split into M four color models to enumerate form, wherein each mould
Type all contains black ink；
Ink amount limitation module, is split in module based on four color models by device enumeration, prepares T grades of Nie Gebaier step-wedges,
And the sample that transfinites is measured by Visual Observations Observations method rejecting ink, and completion equipment ink measures limitation on this basis；
Color measuring module, using color measuring apparatus, measurement ink amount limits Nie Gebaier step-wedge sample colors in module
Information, and the corresponding ink of rejecting measures the sample color data that transfinite；
Gamut volume computing module, based on color measuring module measures gained color data, utilizes algorithm of convex hull meter
Calculate the gamut volume that device enumeration splits four color models in module；
Color domain coverage ratio computing module, on the basis of gamut volume closes the calculating of computing module gamut volume, passes through enumerative technique
The gamut volume that computation model quantity combines for N four color models, wherein N=1,2,3,4；Then, for any figure to be copied
Picture, judges that each four color model combines color domain coverage ratio G of the corresponding colour gamut for image to be copied using colour gamut determination methods；
Four colour cells close primary election module, are maximized with four color models combination color domain coverage ratio G in color domain coverage ratio computing module
For principle, determine that four color models are combined；
Four colour cells close whole modeling block, if four colour cells, which close only group model combination in primary election module, meets condition, it is
It is optimal to split；If four colour cells, which are closed, has that multigroup combination is required while meeting in primary election module, first by figure to be copied
As carrying out resampling, its pixel quantity is set to be down to Q, then Q pixel of calculating and four colour cells close the N selected by primary election module
Average color difference C between color-values corresponding to the black quantity space midpoint W of individual four color model, and foundation is minimised as with average color difference C,
Final four color models combination is chosen, completes to split modeling.
Wherein, Nie Gebaier step-wedge series T should be greater than 20 in ink amount limitation module.
Wherein, measurement gained color information should be spectral reflectivity information or chrominance information in color measuring module.
Wherein, should be by the ascending progress of model quantity N when asking for color domain coverage ratio G in color domain coverage ratio computing module
Attempt, if in N=NoptDuring ＜ 4, G=100% need not then attempt N ＞ NoptCombined situation.Wherein, color domain coverage ratio G solution
Using inhull algorithms, its value is equal to the pixel count and image total pixel number that image to be copied is located in four color models combination colour gamut
Ratio.
Wherein, four colour cells close the value of pixel quantity Q in end modeling block for 100 ＜ Q ＜ 200, and four color models ink amount
Space midpoint W definition is the point that each dimension value of ink amount is 50.
Wherein, average color difference C solution should use CIEDE2000 colour difference formulas in the whole modeling block of four colour cells conjunction, use
D50/2 chrominance requirements are calculated.
Each module is implemented with each step accordingly, and it will not go into details by the present invention.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (10)
1. it is a kind of towards the multi-color halftone disassembled asset formula modeling method for replicating object, it is characterised in that to comprise the following steps：
Step 1, multi-color halftone equipment is split into M four color models to enumerate form, wherein each model all contains black ink
Water；
Step 2, based in step 1 four color models, T grades of Nie Gebaier step-wedges are prepared, and reject by Visual Observations Observations method
Ink measures the sample that transfinites, and completes equipment ink amount limitation on this basis；
Step 3, using color measuring apparatus, Nie Gebaier step-wedges sample color information in measuring process 2, and reject corresponding ink amount
Transfinite sample color data；
Step 4, based on step 3 measures gained color data, the colour gamut of four color models in algorithm of convex hull calculation procedure 1 is utilized
Volume；
Step 5, on the basis of the calculating of step 4 gamut volume, combined by enumerative technique computation model quantity for N four color models
Gamut volume, wherein N=1,2,3,4；Then, for any image to be copied, each four colors mould is judged using colour gamut determination methods
Color domain coverage ratio G of the corresponding colour gamut of type combination for image to be copied；
Step 6, principle is turned to four color models combination color domain coverage ratio G maximums in step 5, determines that four color models are combined；
Step 7, if the combination of an only group model meets condition in step 6, it is optimal fractionation；If existing in step 6 multigroup
Combination meets desired situation simultaneously, then image to be copied is carried out into resampling first, its pixel quantity is down to Q, then
Calculate Q pixel and combine putting down between color-values corresponding to ink quantity space midpoint W with N number of four color model selected by step 6
Equal aberration C, and foundation is minimised as with average color difference C, final four color models combination is chosen, completes to split modeling.
2. according to claim 1 towards the multi-color halftone disassembled asset formula modeling method for replicating object, it is characterised in that
Nie Gebaier step-wedges series T should be greater than 20 in step 2.
3. according to claim 1 towards the multi-color halftone disassembled asset formula modeling method for replicating object, it is characterised in that
Measurement gained color information should be spectral reflectivity information or chrominance information in step 3.
4. according to claim 1 towards the multi-color halftone disassembled asset formula modeling method for replicating object, it is characterised in that：
When color domain coverage ratio G is asked in step 5, it should be attempted model quantity N is ascending, if in N=NoptDuring ＜ 4, G=
100%, then it need not attempt N ＞ NoptCombined situation, wherein, color domain coverage ratio G solution uses inhull algorithms, and its value is equal to
Image to be copied is located at the ratio that four color models combine pixel count and image total pixel number in colour gamut.
5. according to claim 1 towards the multi-color halftone disassembled asset formula modeling method for replicating object, it is characterised in that
Pixel quantity Q value is 100 ＜ Q ＜ 200 in step 7, and the black quantity space midpoint W of four color models combination definition is that ink is measured
Each dimension value is 50 point, and average color difference C solution should use CIEDE2000 colour difference formulas, using D50/2 chrominance requirements
Calculated.
6. it is a kind of towards the multi-color halftone disassembled asset formula modeling for replicating object, it is characterised in that including with lower module：
Device enumeration splits module, multi-color halftone equipment is split into M four color models to enumerate form, wherein each model is all
Contain black ink；
Ink amount limitation module, is split in module based on four color models by device enumeration, prepares T grades of Nie Gebaier step-wedges, and lead to
Cross Visual Observations Observations method rejecting ink and measure the sample that transfinites, and complete equipment ink on this basis and measure limitation；
Color measuring module, using color measuring apparatus, measurement ink amount limits Nie Gebaier step-wedge sample color information in module,
And the corresponding ink of rejecting measures the sample color data that transfinite；
Gamut volume computing module, based on color measuring module measures gained color data, is calculated using algorithm of convex hull and set
It is standby to enumerate the gamut volume for splitting four color models in module；
Color domain coverage ratio computing module, on the basis of the calculating of gamut volume computing module gamut volume, mould is calculated by enumerative technique
The gamut volume that type quantity combines for N four color models, wherein N=1,2,3,4；Then, for any image to be copied, utilize
Colour gamut determination methods judge color domain coverage ratio G of each corresponding colour gamut of four color models combination for image to be copied；
Four colour cells close primary election module, and original is turned to four color models combination color domain coverage ratio G maximums in color domain coverage ratio computing module
Then, determine that four color models are combined；
Four colour cells close whole modeling block, if four colour cells, which close only group model combination in primary election module, meets condition, it is as optimal
Split；If four colour cells, which are closed, has that multigroup combination is required while meeting in primary election module, image to be copied is entered first
Row resampling, makes its pixel quantity be down to Q, and then Q pixel of calculating and four colour cells close N number of four selected by primary election module
Average color difference C between color-values corresponding to color model ink quantity space midpoint W, and foundation is minimised as with average color difference C, choose
Final four color models combination, completes to split modeling.
7. according to claim 6 towards the multi-color halftone disassembled asset formula modeling for replicating object, it is characterised in that
Nie Gebaier step-wedge series T should be greater than 20 in ink amount limitation module.
8. according to claim 6 towards the multi-color halftone disassembled asset formula modeling for replicating object, it is characterised in that
Measurement gained color information should be spectral reflectivity information or chrominance information in color measuring module.
9. according to claim 6 towards the multi-color halftone disassembled asset formula modeling for replicating object, it is characterised in that
When color domain coverage ratio G is asked in color domain coverage ratio computing module, it should be attempted model quantity N is ascending, if in N=
NoptDuring ＜ 4, G=100% need not then attempt N ＞ NoptCombined situation, wherein, color domain coverage ratio G solution is calculated using inhull
Method, its value is equal to image to be copied and is located at the ratio that four color models combine pixel count and image total pixel number in colour gamut.
10. according to claim 6 towards the multi-color halftone disassembled asset formula modeling for replicating object, its feature exists
In, four colour cells close the value of pixel quantity Q in end modeling block for 100 ＜ Q ＜ 200, and the black quantity space midpoint W of four color models
The point that each dimension value of ink amount is 50 is defined as, the solution that four colour cells close average color difference C in whole modeling block should use CIEDE2000
Colour difference formula, is calculated using D50/2 chrominance requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710519743.3A CN107330188B (en) | 2017-06-30 | 2017-06-30 | Split modeling method and system for multicolor halftone equipment facing copied object |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710519743.3A CN107330188B (en) | 2017-06-30 | 2017-06-30 | Split modeling method and system for multicolor halftone equipment facing copied object |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107330188A true CN107330188A (en) | 2017-11-07 |
| CN107330188B CN107330188B (en) | 2023-01-10 |
Family
ID=60198377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710519743.3A Active CN107330188B (en) | 2017-06-30 | 2017-06-30 | Split modeling method and system for multicolor halftone equipment facing copied object |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107330188B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111524111A (en) * | 2020-04-17 | 2020-08-11 | 北京古今盛世文化传播有限公司 | Printing processing method and device based on artwork |
| US20200387742A1 (en) * | 2017-12-06 | 2020-12-10 | Axalta Coating Systems Ip Co., Llc | Color matching sample databases and systems and methods for the same |
| CN115471507A (en) * | 2022-10-26 | 2022-12-13 | 华东师范大学 | Bright field multicolor immunohistochemical image dyeing and splitting method based on deep learning |
| CN115690249A (en) * | 2022-11-03 | 2023-02-03 | 武汉纺织大学 | Method for constructing digital color system of textile fabric |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4431270A1 (en) * | 1993-10-21 | 1995-04-27 | Roland Man Druckmasch | Process for controlling the ink flow of an autotypically working printing machine |
| WO2008151471A1 (en) * | 2007-06-15 | 2008-12-18 | Tsinghua University | A robust precise eye positioning method in complicated background image |
| CN103144448A (en) * | 2013-03-27 | 2013-06-12 | 武汉大学 | Ink-quantity limiting method for realizing maximization of ink-jet printing color gamut |
| CN103823943A (en) * | 2014-03-11 | 2014-05-28 | 武汉大学 | Multicolor printing system splitting modeling method for maximizing color gamut |
-
2017
- 2017-06-30 CN CN201710519743.3A patent/CN107330188B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4431270A1 (en) * | 1993-10-21 | 1995-04-27 | Roland Man Druckmasch | Process for controlling the ink flow of an autotypically working printing machine |
| WO2008151471A1 (en) * | 2007-06-15 | 2008-12-18 | Tsinghua University | A robust precise eye positioning method in complicated background image |
| CN103144448A (en) * | 2013-03-27 | 2013-06-12 | 武汉大学 | Ink-quantity limiting method for realizing maximization of ink-jet printing color gamut |
| CN103823943A (en) * | 2014-03-11 | 2014-05-28 | 武汉大学 | Multicolor printing system splitting modeling method for maximizing color gamut |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200387742A1 (en) * | 2017-12-06 | 2020-12-10 | Axalta Coating Systems Ip Co., Llc | Color matching sample databases and systems and methods for the same |
| CN111524111A (en) * | 2020-04-17 | 2020-08-11 | 北京古今盛世文化传播有限公司 | Printing processing method and device based on artwork |
| CN111524111B (en) * | 2020-04-17 | 2023-06-16 | 北京古今盛世文化传播有限公司 | Printing processing method and device based on artwork |
| CN115471507A (en) * | 2022-10-26 | 2022-12-13 | 华东师范大学 | Bright field multicolor immunohistochemical image dyeing and splitting method based on deep learning |
| CN115471507B (en) * | 2022-10-26 | 2023-09-15 | 华东师范大学 | Deep learning-based bright field multicolor immunohistochemical image dyeing and splitting method |
| CN115690249A (en) * | 2022-11-03 | 2023-02-03 | 武汉纺织大学 | Method for constructing digital color system of textile fabric |
| CN115690249B (en) * | 2022-11-03 | 2023-06-16 | 武汉纺织大学 | Method for constructing textile fabric digital color system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107330188B (en) | 2023-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107330188A (en) | Towards the multi-color halftone disassembled asset formula modeling method and system for replicating object | |
| CN103144448B (en) | Ink-quantity limiting method for realizing maximization of ink-jet printing color gamut | |
| US7911648B2 (en) | Method for creating a color transform relating color reflectances produced under reference and target operating conditions and data structure incorporating the same | |
| CN100589521C (en) | Method for printing and outputting L*a*b* image with high fidelity | |
| CN102799895B (en) | Based on the offset ink color matching method of least square method supporting vector machine | |
| WO2014094541A1 (en) | Method and system for correcting closed loop color based on multi-dimensional table | |
| CN103823943B (en) | Multicolor printing system splitting modeling method for maximizing color gamut | |
| CN107452042B (en) | A kind of halftoning apparatus spectral characteristic model optimization method and system | |
| CN103870689A (en) | Light spectrum predication method for printing system | |
| CN103862858B (en) | A kind of multi-color printing print system spectrum color separation method | |
| CN107341303A (en) | Spray printing device spectrum colour separating model bearing calibration and the system of limitation sample are measured based on ink | |
| JP7557829B2 (en) | Method for determining match factors for color matching of prints produced at a given target lightness - Patents.com | |
| CN107509005A (en) | A kind of halftoning apparatus spectrum algorithm of color separation optimization bearing calibration and system | |
| US7777916B2 (en) | Method for producing a table of predicted reflectances under target operating conditions and data structure and printing system incorporating the table | |
| US8088207B2 (en) | Eleven-color printing ink set and method of use | |
| JP2015115738A (en) | Lookup table generation method, lookup table generation device, and color conversion device | |
| CN103419511A (en) | Color processing apparatus and method | |
| CN107357537B (en) | Method and system for constructing color separation models of halftone equipment in batch for different media | |
| US7782489B2 (en) | Method for selecting a sample set useful in relating color reflectances producible under reference and target operating conditions and the sample set producing thereby | |
| Guyler | Visualization of expanded printing gamuts using 3-dimensional convex hulls | |
| CN113409206A (en) | High-precision digital printing color space conversion method | |
| CN109086861A (en) | Offset printing halftone dot prediction technique based on BP neural network | |
| WO2019074467A1 (en) | Method for separating the colours of a digital image into two coloured inks and black ink for four or more colour printing | |
| Liu et al. | Quality assessment of digital proofing and discussion on standards of color difference | |
| CN115179659A (en) | Intelligent color correction method and system for color ink jet printing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |