CN109808306A - The determination method and device of printing equipment linearization curve - Google Patents
The determination method and device of printing equipment linearization curve Download PDFInfo
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- CN109808306A CN109808306A CN201711159362.5A CN201711159362A CN109808306A CN 109808306 A CN109808306 A CN 109808306A CN 201711159362 A CN201711159362 A CN 201711159362A CN 109808306 A CN109808306 A CN 109808306A
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Abstract
The application provides a kind of determination method and device of printing equipment linearization curve, this method comprises: obtaining the corresponding alternative linearization curve of each Nelson's coefficient according to preset multiple Nelson's coefficients；According to each alternative linearization curve and default sampling point set, the corresponding tertiary colour target figure of each Nelson's coefficient is obtained；Obtain the measurement density data and three color field survey density datas of each tertiary colour target figure；According to the measurement density data of each tertiary colour target figure, three color field survey density datas and printing standard density data, target Nelson's coefficient is determined；Target linearization curve is determined according to target Nelson's coefficient.It realizes Nelson's coefficient value to automatically determine, it is ensured that the target linearization curve of generation meets printing standard, to achieve the purpose that science, accurate generating device linearization curve, lays the foundation for further color management.
Description
Technical field
This application involves printing technology more particularly to the determination methods and dress of a kind of printing equipment linearization curve
It sets.
Background technique
With the development of the technologies such as digital sample printing and digital printing, effect of the color management in print production is increasingly heavier
It wants.Therefore, improving printing efficiency by color management and the combination of printing new technology becomes research hotspot.Existing printing process
In, due to the original output state of ink-jet output equipment be not it is linear, the printing contrast of output, level are undesirable, exist
The problems such as heap ink, colour cast, be not suitable for further color management.In order to improve print quality, it is therefore desirable to carry out output equipment
Linearisation.
Equipment linearisation is to be based on paper and ink characteristics, optimization each single channel ink amount of output equipment, control printing contrast,
Level provides the foundation for the creation of device characteristics file.Equipment linearisation becomes a step crucial in print production technique, right
True reappearance original copy, the printing for obtaining high quality are significant.Therefore, linearization curve is accurately calculated for how to facilitate
It is technical problem urgently to be resolved in printing color management.
Summary of the invention
The application provides a kind of determination method and device of printing equipment linearization curve, to solve prior art Nelson
The defects of coefficient accuracy difference causes determining printing equipment linearization curve not meet printing standard.
The application first aspect provides a kind of determination method of printing equipment linearization curve, comprising:
According to preset multiple Nelson's coefficients, the corresponding alternative linearization curve of each Nelson's coefficient is obtained；
According to each alternative linearization curve and default sampling point set, the corresponding tertiary colour target figure of each Nelson's coefficient is obtained；
Obtain the measurement density data and three color field survey density datas of each tertiary colour target figure；
According to the measurement density data, the three colors field survey density data and printing standard of each tertiary colour target figure
Density data determines target Nelson's coefficient；
Target linearization curve is determined according to the target Nelson coefficient.
Further aspect of the application provides a kind of determining device of printing equipment linearization curve, comprising:
First obtains module, for it is corresponding alternative to obtain each Nelson's coefficient according to preset multiple Nelson's coefficients
Linearization curve；
Second obtains module, for obtaining each Nelson's coefficient according to each alternative linearization curve and default sampling point set
Corresponding tertiary colour target figure；
Third obtains module, for obtaining the measurement density data and three color field survey density of each tertiary colour target figure
Data；
First processing module, for the measurement density data according to each tertiary colour target figure, the three colors field survey
Density data and printing standard density data determine target Nelson's coefficient；
Second processing module, for determining target linearization curve according to the target Nelson coefficient.
The determination method and device of printing equipment linearization curve provided by the present application, for equipment in printing color management
The demand of linearisation is based on printing standard density curve, chooses from the corresponding alternative linearization curve of a plurality of Nelson's coefficient
To with the most matched target linearization curve of printing standard density curve, realize Nelson's coefficient value and automatically determine, it is ensured that is raw
At target linearization curve meet printing standard, to achieve the purpose that science, accurate generating device linearization curve, be
Further color management lays the foundation.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this Shen
Some embodiments please for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow diagram of the determination method for the printing equipment linearization curve that one embodiment of the application provides；
Fig. 2 is the structural schematic diagram of the determining device for the printing equipment linearization curve that one embodiment of the application provides.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
Some embodiments of the present application, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall in the protection scope of this application.
Embodiment one
The present embodiment provides a kind of determination methods of printing equipment linearization curve, for determining the linearisation of printing equipment
Curve.The executing subject of the present embodiment be printing equipment linearization curve determining device, the device can be set server,
In the terminal devices such as PC, tablet computer.
As shown in Figure 1, the flow diagram of the determination method for printing equipment linearization curve provided in this embodiment, it should
Method includes:
Step 101, according to preset multiple Nelson's coefficients, it is bent to obtain the corresponding alternative linearisation of each Nelson's coefficient
Line.
Step 102, according to each alternative linearization curve and default sampling point set, it is corresponding compound to obtain each Nelson's coefficient
Color target figure.
Step 103, the measurement density data and three color field survey density datas of each tertiary colour target figure are obtained.
Step 104, according to the measurement density data of each tertiary colour target figure, three color field survey density datas and printing standard
Density data determines target Nelson's coefficient.
Step 105, target linearization curve is determined according to target Nelson's coefficient.
Specifically, multiple Nelson's coefficients can rule of thumb be preset, and these preset multiple Nelson's coefficients are used,
The corresponding alternative linearization curve of each Nelson's coefficient is obtained, i.e., each corresponding alternative linearization curve of Nelson's coefficient.
After obtaining each alternative linearization curve, default sampling point set is determined, which is from printing standard density curve
Input point set in select, printing standard density curve is international standard curve, and input point set is known determination
Standard point set, details are not described herein.After default sampling point set has been determined, then according to each alternative linearization curve and default adopt
Sampling point collection obtains the corresponding tertiary colour target figure of each Nelson's coefficient, and it is corresponding multiple to obtain each Nelson's coefficient especially by printing
Close color target figure.After getting the corresponding tertiary colour target figure of each Nelson's coefficient, then the measurement of available each tertiary colour target figure
Density data and three color field survey density datas can specifically be obtained by measurement, and specific measurement method is the prior art,
This is repeated no more.According to the measurement density data of each tertiary colour target figure, three color field survey density datas and printing standard density
Data, determine target Nelson's coefficient, printing standard density data be printing standard density curve input point set and its
Corresponding output point set is the given data of international standard.It, then can basis after target Nelson's coefficient has been determined
Target Nelson's coefficient determines target linearization curve, specially the corresponding alternative linearization curve of target Nelson coefficient, that is, true
It is set to target linearization curve.
The determination method of printing equipment linearization curve provided in this embodiment, it is linear for equipment in printing color management
The demand of change, be based on printing standard density curve, from the corresponding alternative linearization curve of a plurality of Nelson's coefficient choose to
The most matched target linearization curve of printing standard density curve, realizes Nelson's coefficient value and automatically determines, it is ensured that generation
Target linearization curve meets printing standard, is into one to achieve the purpose that science, accurate generating device linearization curve
The color management of step lays the foundation.
Embodiment two
The present embodiment does further supplementary explanation to the determination method for the printing equipment linearization curve that embodiment one provides.
As a kind of enforceable mode, on the basis of the above embodiment 1, optionally, step 101 specifically be can wrap
It includes:
Step 2011, step-wedge color target figure is obtained according to default input point set.
Step 2012, the step-wedge measurement density and step-wedge maximum for obtaining step-wedge color target figure measure density.
Step 2013, density and preset multiple Nelson's coefficients are measured according to step-wedge maximum, obtains corresponding standard ginseng
Examine density.
Corresponding canonical reference density is specifically obtained using following formula (1):
Wherein, DsDensity is measured for step-wedge maximum, N is Nelson's coefficient, XiIt represents in default input point set In i-th
The value of input point, DiRepresent the value X of i-th of input point in default input point set IniCorresponding canonical reference density value.
Step 2014, density is measured according to step-wedge and each Nelson's coefficient of canonical reference density fitting acquisition is corresponding alternative
Linearization curve.
As another enforceable mode, on the basis of the above embodiment 1, optionally, step 104 specifically can be with
Include:
Step 2021, according to the measurement density data of each tertiary colour target figure, three color field survey density datas, and it is default
The corresponding printing standard density data of sampling point set determines the calculating standard density of each point in default sampling point set.
Step 2022, corresponding with default sampling point set compound according to the calculating standard density of each point in default sampling point set
The measurement density data of color target figure determines the mean difference of each point in the corresponding each default sampling point set of each alternative linearization curve
Ratio.
Step 2023, according to the mean difference ratio of each point in the corresponding each default sampling point set of each alternative linearization curve
Rate determines target Nelson's coefficient.
Optionally, step 2021 can specifically include:
Step 2031, the default corresponding printing standard density data of sampling point set is obtained.
Step 2032, the ratio between three color field survey density and printing standard density curve vertex density is calculated.
Step 2033, according to the ratio between three color field survey density and printing standard density curve vertex density, really
Surely the calculating standard density of each point in default sampling point set.
Specifically, inputting point set InS and printing standard density curve according to printing standard density curve, printing mark is obtained
Quasi- density data OutS, presetting sampling point set is n point for selecting to obtain from InS, is denoted as set InD；
The default corresponding printing standard density data of sampling point set is obtained from OutS；
(3) calculate the ratio between three color field survey density and printing standard density curve vertex density according to the following formula
Rate:
Rate=(OutMIt is real-OutSzq)/(OutSjq-OutSzq)z,j∈[2,r-1]OutSzq≤OutMIt is real≤OutSjq
(3)；
Wherein: OutMIt is realFor tri- color field survey density of CMY；OutSjqAnd OutSzqFor printing standard density curve set
The vertex density of jth and z curve in OutS, wherein z=j-1；
According to the ratio between three color field survey density and printing standard density curve vertex density, using following formula
(4) the calculating standard density Std of each point in default sampling point set is calculated:
Wherein, t represent in point set InS with i-th of point value Z in default sampling point set InDiIt is worth the call number of corresponding point,
OutSjt、OutSztIndicate the printing mark of jth and z printing standard density points concentration t point in printing standard density data set OutS
The relationship of quasi- density value, z and j are as follows: z=j-1.
Optionally, step 2022 can specifically include:
Step 2041, corresponding with default sampling point set compound according to the calculating standard density of each point in default sampling point set
The measurement density data of color target figure calculates the difference ratio of each point in default sampling point set.
Specifically, being directed to every alternative linearization curve, the calculating standard density and symbol of default sampling point set can be all corresponded to
The measurement density data of color target figure is closed, therefore, the difference ratio for calculating acquisition also has multiple groups, every group of correspondence one alternative linearisation
Curve.
Step 2042, it according to the difference ratio of each point in default sampling point set, calculates and obtains each alternative linearization curve pair
The mean difference ratio answered.
Specifically, according to the calculating standard density tertiary colour corresponding with default sampling point set of each point in default sampling point set
The measurement density data of target figure calculates the difference ratio △ E of each point in default sampling point set using following formula (5)i:
△Ei=fabs (Stdi-OutMji)/Stdii∈[1,n] (5)；
Wherein: StdiFor the calculating standard density for presetting each point in sampling point set InD, OutMjiFor in OutMj and in InD
The corresponding measurement density of point i, n indicate the number of sampled point in default sampling point set；
(6) obtain the corresponding mean difference ratio △ E of each Nelson's coefficient according to the following formulameanj:
△Emeanj=(△ E1+…△Ei+…+△En)/n i∈[1,n] (6)。
Wherein, △ EmeanjIndicate the corresponding mean difference ratio of j-th of Nelson's coefficient.
Optionally, step 2023 can specifically include: will be worth Nelson's coefficient corresponding to the smallest mean difference ratio
It is determined as target Nelson's coefficient.
Specifically, the smallest Nelson's coefficient of mean difference ratio is target Nelson's coefficient.Target Nelson system
The corresponding alternative linearization curve of number is target linearization curve.
The determination method of printing equipment linearization curve provided in this embodiment, it is linear for equipment in printing color management
The demand of change, be based on printing standard density curve, from the corresponding alternative linearization curve of a plurality of Nelson's coefficient choose to
The most matched target linearization curve of printing standard density curve, realizes Nelson's coefficient value and automatically determines, it is ensured that generation
Target linearization curve meets printing standard, is into one to achieve the purpose that science, accurate generating device linearization curve
The color management of step lays the foundation.A plurality of linearization curve is generated using traversal Nelson's Y-factor method Y, exports a variety of different contrasts
Then the sampled point tertiary colour target of level calculates sampled point using tri- color field survey density of CMY in conjunction with printing standard density
Standard density chooses optimal Nelson's coefficient value by calculating sampled point standard density and measuring the difference ratio of density.Wherein
The output effect of variant Nelson's coefficient value can be known in advance in traversal；The standard density of sampled point is close according to printing standard
Degree calculates, and is more in line with printing standard specification, and the equipment after capable of guaranteeing calibration meets the standard of printing, and it is color to reach control
The purpose of chromatic graph picture entirety contrast.
Embodiment three
The present embodiment does further specifically the determination method of printing equipment linearization curve provided by the above embodiment
It is bright.
This method can specifically include following four step:
Step 1: obtaining the corresponding a plurality of linearization curve of multiple Nelson's coefficients
K printing equipment linearization curve of setting is indicated by following expressions:
In={ X1,X2,......,Xi,......,Xm} Xi∈[0,100]
Out={ Out1,Out2,......,Outj,......,Outk} j∈[1,k]
Outj={ Y1,Y2,......,Yi,......,Ym} Yi∈[0,100]
Wherein: In indicates input point set (unit is percentage), and m indicates In number, XiRepresent the value of input point；Out
Indicate that k linearization curve exports point set；OutjIndicate that j-th strip equipment linearization curve exports point set, YiRepresent j-th strip
X in linearization curveiCorresponding output valve.
The process for specifically obtaining above-mentioned k linearization curve is as follows:
(1) step-wedge color target figure is printed
Step-wedge color target figure is made of the step-wedge of each color of printing device, and the color value in step-wedge is by m in point set In
Sample color lump composition.
(2) measurement step-wedge color target figure obtains step-wedge and measures density
The assorted face step-wedge measurement density curve of output indicates that assorted face step-wedge measures density points with point set In and D'
Set D' is expressed as follows:
D'={ D'1, D'2..., D'i..., D'm, i ∈ [1, m]
Wherein, D'iRepresent X in point set IniCorresponding step-wedge measures density value.
Step-wedge color target figure is measured, assorted face step-wedge measurement density point set D' is obtained and assorted face step-wedge maximum measures density
Ds。
(3) canonical reference density is calculated according to maximum measurement density and preset multiple Nelson's coefficients
Single canonical reference density curve data can indicate that point set D is expressed as follows with point set In and D:
D={ D1, D2..., Di..., Dm, i ∈ [1, m]
Wherein, DiRepresent X in point set IniCorresponding canonical reference density value.
DiIt is calculated and is obtained by following formula (1):
Wherein, DsThe assorted face step-wedge maximum obtained for above-mentioned measurement measures density, and N is Nelson's coefficient.
Multiple Nelson's coefficients are preset, for example Nelson's coefficient N is taken as:
A plurality of canonical reference density output valve is calculated according to formula (1), canonical reference density output valve point set indicates
It is as follows:
Wherein, Dj represents the corresponding canonical reference density set of j-th of printing equipment color face Nelson's coefficient value.
(4) fitting obtains k linearization curve
Density data D' and j-th strip canonical reference density set Dj fitting, which is measured, according to step-wedge obtains linearization curve Oj。
The specific following formula of fitting formula (2):
Wherein, YiThe j-th strip linearization curve data as acquired；
DjiIt represents j-th strip reference density point and concentrates XiCorresponding reference density value, D'pAnd D'p-1Respectively indicate input point set
Close X in InpAnd Xp-1Corresponding step-wedge measures density value；
The value of i and p meets following relationship:
D'p≤Dji≤D'p-1。
Step 2: using a plurality of spare linearisation curve printing tertiary colour target figure obtained
After obtaining the spare linearization curve of k item, then the spare linearisation curve printing tertiary colour target figure of the k item, tool are used
Body process is as follows:
Printing standard density curve input point set is set as lnS (for known standard point set):
InS={ S1,S2,......,Si,......,Sq} Si∈[0,100]
Wherein: SiIndicate input point value (unit is percentage), q indicates the number of input point.
Standard input point set lnS corresponds to the output point set of r different vertex densities, and being generally denoted as OutS (is known
International standard), it is expressed as follows:
OutS=OutS1, OutS2 ..., OutSj ..., OutSr } j ∈ [1, r]
Wherein: r is the quantity of printing standard density curve, and q is the number of the output point of each printing standard density curve,
OutSj represents print of the printing standard density curve input point set InS under the vertex density of j-th strip printing standard density curve
Brush standard density set；OutSjiRepresent i-th of input point value S in point set InSiIt is close on j-th strip printing standard density curve vertex
The respective value under point set OutSj is spent, presetting sampled point is the n point selected from point set InS, and default sampled point is denoted as InD.
(1) Samples selecting is preset
It selects n point as default sampled point from printing standard density curve input point set lnS, is denoted as default sampling
Point set InD, is expressed as follows:
InD={ Z1,Z2,......,Zi,......,Zn} Zi∈[0,100]
Wherein, ZiThe CMY input value (unit is percentage) of each sampled point is represented, n represents default number of sampling points.
(2) tertiary colour target figure is printed
Using input tri- color of point set InD and CMY on the spot color lump (i.e. tri- color value of CMY be 100 color lump) formulate output
Color target figure.
The tertiary colour target figure is exported with the alternative linearization curve of k item of above-mentioned acquisition and is measured, and measurement density number is obtained
According to tri- color field survey density value OutM of set OutM and CMYIt is real.OutM is expressed as follows:
OutM=OutM1, OutM2 ..., OutMj ... OutMk } j ∈ [1, k]
Wherein: OutMj represents the corresponding measurement density set of default sampled point of different alternative linearization curve outputs；
OutMjiRepresent Z in default sampling point set InDiRespective value at OutMj.
Step 3: calculating the calculating standard density of default sampling point set
The default corresponding calculating standard density of sampling point set InD is calculated, detailed process is as follows:
(1) density ratio calculates
It is calculated between tri- color field survey density of CMY and printing standard density curve vertex density using following formula (3)
Ratio:
Rate=(OutMIt is real-OutSzq)/(OutSjq-OutSzq)z,j∈[2,r-1] OutSzq≤OutMIt is real≤OutSjq
(3)
Wherein: OutMIt is realFor tri- color field survey density of CMY, i.e., three color field survey density of above-mentioned acquisition；
OutSjqAnd OutSzqFor the vertex density of jth and z curve in printing standard density curve set OutS, wherein z
=j-1.
(2) the calculating standard density of default sampling point set is determined according to ratio
If the default corresponding calculating standard density of sampling point set InD is denoted as point set Std:
Std={ Std1,Std2,...,Stdi,...Stdn} i∈[1,n]
Wherein: StdiRepresent Z in default sampling point set InDiCorresponding calculating standard density value, StdiIt calculates using as follows
Formula (4):
Wherein: t represent in point set InS with Z in default sampling point set InDiIt is worth corresponding inode number, OutSjt、
OutSztIndicate that jth and z printing standard density points concentrate the printing standard of t node close in printing standard density curve set OutS
The relationship of angle value, z and j are as follows: z=j-1.
Step 4: Nelson's coefficient is chosen
This step mainly chooses Buddhist nun by calculating sampled point calculating standard density and measuring the difference ratio between density
Ademilson coefficient value.
(1) calculating difference ratio
It calculates the default corresponding calculating standard density set Std of sampling point set InD and a certain item measures density set OutMj
Between each point mean difference ratio.
Single node difference ratio △ E is calculated according to following formula (5)i:
△Ei=fabs (Stdi-OutMji)/Stdi i∈[1,n] (5)
Wherein: StdiFor the calculating standard density of each node of InD, OutMjiFor the corresponding measurement of each node i of InD in OutMj
Density, n indicate sampling number.
By the above-mentioned density difference ratio △ E being calculatedi(6) are averaged to obtain △ E according to the following formulameanj。
△Emeanj=(△ E1+…△Ei+…+△En)/n i∈[1,n] (6)
(2) Nelson's coefficient value is determined
K linearization curve is calculated separately according to the method described above and corresponds to each node mean difference ratio, is denoted as set △
Emean:
△Emean={ △ Emean1,△Emean2,...,△Emeanj,...,△Emeank} j∈[1,k]
Assuming that set △ EmeanMiddle minimum value is △ Emeanj, then the corresponding Nelson's coefficient value of the difference ratio is and seeks
Nelson's coefficient.
Illustratively, in the present embodiment, the output equipment used for 7910 digital-code printer of EPSON Stylus Pro,
Paper is general too gram 170 grams of advanced matt photo papers, and measuring device is the EyeOne-iSis of X. Rite Inc..Optionally, may be used
To be other enforceable output equipment, paper or measuring devices, the present embodiment is only exemplary explanation, not limits it
System.
The number of input point is set as m=30, input point set is preset and uses following data:
In=0.0,1.0,2.0,3.0,4.0,6.0,8.0,10.O, 12.0,15.0,17.0,20.0,24.0,28.0,
32.0,36.0,40.0,44.0,48.0,52.0,56.0,61.0,65.0,70.0,75.0,80.0,85.0,90.0,95.0,
100.0}
Firstly, printing step-wedge color target figure, color target figure is by tetra- color face ladders of C, M, Y, K using above-mentioned default input point set
Ruler composition, as shown in table 1:
Table 1
| Cyan face node C | C1 | C2 | C3 | … | C28 | C29 | C30 |
| Product color face node M | M1 | M2 | M3 | … | M28 | M29 | M30 |
| Yellow face node Y | Y1 | Y2 | Y3 | … | Y28 | Y29 | Y30 |
| Black side node K | K1 | K2 | K3 | … | K28 | K29 | K30 |
The color lump figure successively printed using the assorted printing ink of above-mentioned default input point ratio, specially existing skill
Art, details are not described herein.
With each color lump of measuring instrument measurement step-wedge color target figure, the step-wedge for obtaining each color lump in assorted face measures density point set
It closes D' and assorted face step-wedge maximum measures density Ds。
D'={ D'1, D'2..., D'i..., D'30, i ∈ [1,30]
For example, the step-wedge maximum measurement density in the tetra- color faces C, M, Y, the K obtained in the present embodiment be respectively 1.72,
1.73,1.22 and 1.74.
Optionally, after obtaining step-wedge maximum measurement density according to measurement, maximal density can also be rule of thumb set, then
The step-wedge maximum measurement density D finally usedsIt is obtained for measurement and smaller in the two is arranged in experience, for example be rule of thumb arranged
Step-wedge maximal density be respectively 1.80,1.80,1.10,1.80, then the step-wedge maximum that finally uses measurement density DsFor 1.72,
173、1.10、1.74。
Density D is measured with the step-wedge maximum in a color face belowsFor, illustrate the target linearisation song for a colour system
The determination process of line.The specific determination process of other each colour systems is identical as the colour system, the step-wedge maximum measurement density only used
It is different.
25 Nelson's coefficients are preset in the present embodiment, as follows:
The previously obtained step-wedge maximum finally used is measured density Ds, such as the step-wedge maximum measurement density D of cyan Cs
Formula (1) is substituted into respectively for 1.72 and 25 Nelson's coefficient values, and canonical reference density point set D is calculated.
Wherein, Dj represents the corresponding canonical reference density set of j-th of printing equipment color face Nelson's coefficient value.That is D
Include the corresponding canonical reference density set of 25 Nelson's coefficients, include in each canonical reference density set 30 with it is pre-
If the corresponding canonical reference density of 30 input points that input point is concentrated.
Each Dj in canonical reference density D and measurement density data D' are substituted into above-mentioned formula (2) respectively, obtain 25 groups of outputs
Point set Out:
Out={ Out1,Out2,......,Outj,......,Out25} j∈[1,25]
Outj={ Y1,Y2,......,Yi,......,Y30} Yi∈[0,100]
25 alternative linearization curves are obtained according to default input point set In and output point set Out fitting.
It includes q=25 standard sample point in point set InS that printing standard density curve standard, which inputs, as follows:
InS=(0,0,0), (2,1,1), (4,3,3), (6,4,4), (8,5,5), (10,7,7), (15,11,11),
(20,15,15),(25,19,19),(30,23,23),(35,27,27),(40,31,31),(45,36,36),(50,40,40),
(55,45,45),(60,50,50),(65,55,55),(70,60,60),(75,66,66),(80,72,72),(85,78,78),
(90,84,84),(95,92,92),(98,97,97),(100,100,100)}
Bloom, shadow, each point of middle tone are selected from printing standard density curve input point set lnS, as default
Sampling point set InD, it may be assumed that
InD={ (25,19,19), (50,40,40), (75,66,66) }
Using default sampling point set InD and tri- color of CMY, color lump (100,100,100) formulates output tertiary colour target figure on the spot,
It is as shown in table 2:
Table 2
Wherein InD25, InD50, InD75 respectively indicate color lump dot percentage CMY (25,19,19), CMY (50,40,
40) and CMY (75,66,66), N0.5 indicate that the color lump is exported using the corresponding linearization curve of Nelson's coefficient value 0.5；
CMY100 indicates tri- color of CMY color lump on the spot.
The tertiary colour target figure is exported using 25 alternative linearization curves of above-mentioned acquisition and is measured, and measurement density number is obtained
According to tri- color field survey density value OutM of set OutM and CMYIt is real。
For example, the three color field survey density OutM that the present embodiment obtainsIt is realIt is 1.95.
Corresponding OutS (the printing standard that the present embodiment uses of standard input point set InS of printing standard density curve
Density curve includes 20 curves, i.e. r=20) are as follows:
It is the point in InS due to presetting each point in sampling point set InD, inputting the default sampling point set of point set according to standard can
To learn, (25,19,19), (50,40,40) and (75,66,66) in default sampling point set InD respectively correspond S in InS9、S14
And S19.That is InD corresponds to the OutSj in the OutSj in OutS9、OutSj14And OutSj19, j ∈ [1,20].
According to tri- color field survey density of the corresponding printing standard density of InD and the CMY of above-mentioned acquisition, using formula (3)
Calculate the ratio between tri- color field survey density of CMY and printing standard density curve vertex density.Printing standard density curve
Vertex density is OutSj25。
Rate=(OutMIt is real-OutSz25)/(OutSj25-OutSz25)z,j∈[2,r-1] OutSz25≤OutMIt is real≤
OutSj25 (3)
Wherein, z=j-1.
For example, three color field survey density OutMIt is realIt is 1.5, the vertex density point of two adjacent printing standard density curves
It Wei not 1.4 and 1.7, i.e. OutSz25It is 1.4, OutSj25It is 1.7, then three color field survey density and printing standard density curve
Ratio between vertex density are as follows:
Rate=(OutMIt is real-OutSz25)/(OutSj25-OutSz25)=(1.5-1.4)/(1.7-1.5)=0.5 z, j ∈
[2,r-1]
Then preset Z in sampling point set InDiCorresponding calculating standard density value StdiIt can be determined using formula (4).That is,
Due to OutSz25≤OutMIt is real≤OutSj25: it can be obtained according to formula (4):
Stdi=rate*OutSjt+(1-rate)*OutSzt
For each point (25,19,19), (50,40,40) and (75,66,66) in InD, corresponding calculating standard
Density is respectively as follows:
Std1=rate*OutSj9+(1-rate)*OutSz9
Std2=rate*OutSj14+(1-rate)*OutSz14
Std3=rate*OutSj19+(1-rate)*OutSz19。
If OutMIt is real≤OutS125, then:
Std1=OutS19
Std2=OutS114
Std3=OutS119。
If OutMIt is real≥OutS2025, then
Std1=OutS209
Std2=OutS2014
Std3=OutS2019。
For example, the corresponding calculating standard density of each point is respectively in the default sampling point set InD that the present embodiment determines
0.255,0.540,0.980.
In default sampling point set InD has been determined after the corresponding calculating standard density of each point, default sampling is further determined that
Each point mean difference ratio between the corresponding calculating standard density set Std of point set InD and a certain item measurement density set OutMj
△Emeanj, i.e. the corresponding mean difference ratio of j-th of Nelson's coefficient or the alternative linearization curve of j-th strip are corresponding average
Difference ratio.
△E1=fabs (Std1-OutMj1)/Std1
△E2=fabs (Std2-OutMj2)/Std2
△E3=fabs (Std3-OutMj3)/Std3
△Emeanj=(△ E1+△E2+△E3)/3。
The corresponding mean difference ratio set △ of the alternative linearization curve of acquisition 25 is calculated separately according to the method described above
Emean, it may be assumed that
△Emean={ △ Emean1,△Emean2,...,△Emeanj,...,△Emean25} j∈[1,25]
It is the mean difference ratio that the present embodiment obtains as shown in table (3):
Table 3
If set △ EmeanMiddle minimum value is △ Emeanj, then the corresponding Nelson's coefficient of the mean difference ratio is target
Nelson's coefficient.Namely the corresponding alternative linearization curve of target Nelson's coefficient is target linearization curve.Such as 2 institute of table
Show, it is known that, mean difference ratio minimum 0.055, corresponding Nelson's coefficient is 1.3, then Nelson's coefficient 1.3 is corresponding
Alternative linearization curve is the corresponding target linearization curve of the colour system.
The above are the corresponding target linearization curves of cyan determined using cyan system step-wedge maximum measurement density Ds, simultaneously
Its corresponding target linearization curve can also be determined using the step-wedge maximum measurement density of other colour systems.Detailed process and cyan
Process is identical, and details are not described herein.
The determination method of printing equipment linearization curve provided in this embodiment, it is linear for equipment in printing color management
The demand of change, be based on printing standard density curve, from the corresponding alternative linearization curve of a plurality of Nelson's coefficient choose to
The most matched target linearization curve of printing standard density curve, realizes Nelson's coefficient value and automatically determines, it is ensured that generation
Target linearization curve meets printing standard, is into one to achieve the purpose that science, accurate generating device linearization curve
The color management of step lays the foundation.A plurality of linearization curve is generated using traversal Nelson's Y-factor method Y, exports a variety of different contrasts
Then the sampled point tertiary colour target of level calculates sampled point using tri- color field survey density of CMY in conjunction with printing standard density
Standard density chooses optimal Nelson's coefficient value by calculating sampled point standard density and measuring the difference ratio of density.Wherein
The output effect of variant Nelson's coefficient value can be known in advance in traversal；The standard density of sampled point is close according to printing standard
Degree calculates, and is more in line with printing standard specification, and the equipment after capable of guaranteeing calibration meets the standard of printing, and it is color to reach control
The purpose of chromatic graph picture entirety contrast.
Example IV
The present embodiment provides a kind of determining devices of printing equipment linearization curve, for executing the print of above-described embodiment one
The determination method of brush equipment linearization curve.
As shown in Fig. 2, the structural schematic diagram of the determining device for printing equipment linearization curve provided in this embodiment.It should
The determining device 40 of printing equipment linearization curve includes that the first acquisition module 41, second obtains module 42, third obtains module
43, first processing module 44 and Second processing module 45.
Wherein, first module 41 is obtained for it is corresponding to obtain each Nelson's coefficient according to preset multiple Nelson's coefficients
Alternative linearization curve；Second, which obtains module 42, is used to be obtained each according to each alternative linearization curve and default sampling point set
The corresponding tertiary colour target figure of Nelson's coefficient；Third obtain module 43 be used for obtain each tertiary colour target figure measurement density data and
Three color field survey density datas；It is real that first processing module 44 is used for the measurement density data according to each tertiary colour target figure, three colors
Ground measures density data and printing standard density data, determines target Nelson's coefficient；Second processing module 45 is used for according to mesh
Mark Nelson's coefficient determines target linearization curve.
Device in this present embodiment is closed, wherein modules execute the concrete mode of operation in related this method
It is described in detail in embodiment, no detailed explanation will be given here.
According to the determining device of printing equipment linearization curve provided in this embodiment, for equipment in printing color management
The demand of linearisation is based on printing standard density curve, chooses from the corresponding alternative linearization curve of a plurality of Nelson's coefficient
To with the most matched target linearization curve of printing standard density curve, realize Nelson's coefficient value and automatically determine, it is ensured that is raw
At target linearization curve meet printing standard, to achieve the purpose that science, accurate generating device linearization curve, be
Further color management lays the foundation.
Embodiment five
The present embodiment does further supplement to the determining device for the printing equipment linearization curve that above-described embodiment four provides
Explanation.
As a kind of enforceable mode, on the basis of above-described embodiment four, optionally, first obtains module 41 can be with
Include: the first acquisition submodule, the second acquisition submodule, determine submodule and fitting submodule.
Wherein, the first acquisition submodule is used to obtain step-wedge color target figure according to default input point set；Second obtains submodule
Block is used to obtain the step-wedge measurement density and step-wedge maximum measurement density of step-wedge color target figure；Determine that submodule is used for according to step-wedge most
Big measurement density and preset multiple Nelson's coefficients, determine the corresponding canonical reference density of each Nelson's coefficient；It is fitted submodule
Block is used to measure density according to step-wedge and the fitting of canonical reference density obtains the corresponding alternative linearization curve of each Nelson's coefficient.
As another enforceable mode, on the basis of above-described embodiment four, optionally, first processing module 44 can
To include the first processing submodule, second processing submodule and third processing submodule.
Wherein, the first processing submodule is used for close according to the measurement density data of each tertiary colour target figure, three color field surveys
Degree evidence and the corresponding printing standard density data of default sampling point set determine the calculating mark of each point in default sampling point set
Quasi- density；Second processing submodule is used for according to the calculating standard density and default sampling point set pair for presetting each point in sampling point set
The measurement density data for the tertiary colour target figure answered determines the corresponding mean difference ratio of each Nelson's coefficient；Third handles submodule
Block is used to determine target Nelson's coefficient according to the corresponding mean difference ratio of each Nelson's coefficient.
Optionally, the first processing submodule is specifically used for: obtaining the default corresponding printing standard density data of sampling point set；
Calculate the ratio between three color field survey density and printing standard density curve vertex density；According to three color field survey density
With the ratio between printing standard density curve vertex density, the calculating standard density of each point in default sampling point set is determined.
Optionally, second processing submodule is specifically used for: according to the calculating standard density of each point in default sampling point set with
The measurement density data of the default corresponding tertiary colour target figure of sampling point set calculates the difference ratio of each point in default sampling point set；
According to the difference ratio of each point in default sampling point set, calculates and obtain the corresponding mean difference ratio of each Nelson's coefficient.
Optionally, third processing submodule is specifically used for: will be worth the system of Nelson corresponding to the smallest mean difference ratio
Number is determined as target Nelson's coefficient.
It should be noted that each enforceable mode can individually be implemented in the present embodiment, it can also be in any combination
In conjunction with implementation, it is not limited here.
Device in this present embodiment is closed, wherein modules execute the concrete mode of operation in related this method
It is described in detail in embodiment, no detailed explanation will be given here.
According to the determining device of printing equipment linearization curve provided in this embodiment, for equipment in printing color management
The demand of linearisation is based on printing standard density curve, chooses from the corresponding alternative linearization curve of a plurality of Nelson's coefficient
To with the most matched target linearization curve of printing standard density curve, realize Nelson's coefficient value and automatically determine, it is ensured that is raw
At target linearization curve meet printing standard, to achieve the purpose that science, accurate generating device linearization curve, be
Further color management lays the foundation.A plurality of linearization curve is generated using traversal Nelson's Y-factor method Y, exports a variety of differences
Then the sampled point tertiary colour target of tint hierarchy is calculated in conjunction with printing standard density using tri- color field survey density of CMY and is adopted
Sampling point standard density chooses optimal Nelson's coefficient value by calculating sampled point standard density and measuring the difference ratio of density.
Wherein the output effect of variant Nelson's coefficient value can be known in advance in traversal；The standard density of sampled point is marked according to printing
Quasi- density calculates, and is more in line with printing standard specification, and the equipment after capable of guaranteeing calibration meets the standard of printing, reaches control
The purpose of color image entirety contrast processed.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic disk or light
The various media that can store program code such as disk.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although
The application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, the range of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (12)
1. a kind of determination method of printing equipment linearization curve characterized by comprising
According to preset multiple Nelson's coefficients, the corresponding alternative linearization curve of each Nelson's coefficient is obtained；
According to each alternative linearization curve and default sampling point set, the corresponding tertiary colour target figure of each Nelson's coefficient is obtained；
Obtain the measurement density data and three color field survey density datas of each tertiary colour target figure；
According to the measurement density data, the three colors field survey density data and printing standard density of each tertiary colour target figure
Data determine target Nelson's coefficient；
Target linearization curve is determined according to the target Nelson coefficient.
2. acquisition is each the method according to claim 1, wherein described according to preset multiple Nelson's coefficients
The corresponding alternative linearization curve of Nelson's coefficient, comprising:
Step-wedge color target figure is obtained according to default input point set；
Obtain the step-wedge measurement density and step-wedge maximum measurement density of the step-wedge color target figure；
Density and preset multiple Nelson's coefficients are measured according to the step-wedge maximum, determines that each Nelson's coefficient is corresponding
Canonical reference density；
Density is measured according to the step-wedge and each Nelson's coefficient of canonical reference density fitting acquisition is corresponding alternative linear
Change curve.
3. the method according to claim 1, wherein the measurement density number according to each tertiary colour target figure
According to, the three colors field survey density data and printing standard density data, target Nelson's coefficient is determined, comprising:
According to the measurement density data of each tertiary colour target figure, the three colors field survey density data and described default
The corresponding printing standard density data of sampling point set, determines the calculating standard density of each point in the default sampling point set；
According to the tertiary colour target corresponding with the default sampling point set of the calculating standard density of each point in the default sampling point set
The measurement density data of figure determines the corresponding mean difference ratio of each Nelson's coefficient；
According to the corresponding mean difference ratio of each Nelson's coefficient, target Nelson's coefficient is determined.
4. according to the method described in claim 3, it is characterized in that, the measurement density number according to each tertiary colour target figure
According to, the three colors field survey density data and the corresponding printing standard density data of the default sampling point set, institute is determined
State the calculating standard density of each point in default sampling point set, comprising:
Obtain the default corresponding printing standard density data of sampling point set；
Calculate the ratio between three color field survey density and printing standard density curve vertex density；
According to the ratio between three color field survey density and printing standard density curve vertex density, default sampling point set is determined
The calculating standard density of middle each point.
5. according to the method described in claim 3, it is characterized in that, the calculating according to each point in the default sampling point set
The measurement density data of standard density tertiary colour target figure corresponding with the default sampling point set, determines that each Nelson's coefficient is corresponding
Mean difference ratio, comprising:
According to the tertiary colour target corresponding with the default sampling point set of the calculating standard density of each point in the default sampling point set
The measurement density data of figure calculates the difference ratio of each point in the default sampling point set:
According to the difference ratio of each point in default sampling point set, calculates and obtain the corresponding mean difference ratio of each Nelson's coefficient.
6. according to the method described in claim 3, it is characterized in that, described according to the corresponding mean difference ratio of each Nelson's coefficient
Rate determines target Nelson's coefficient, comprising:
Nelson's coefficient corresponding to the smallest mean difference ratio will be worth and be determined as the target Nelson coefficient.
7. a kind of determining device of printing equipment linearization curve characterized by comprising
First obtains module, for it is corresponding alternative linear to obtain each Nelson's coefficient according to preset multiple Nelson's coefficients
Change curve；
Second obtains module, for it is corresponding to obtain each Nelson's coefficient according to each alternative linearization curve and default sampling point set
Tertiary colour target figure；
Third obtains module, for obtaining the measurement density data and three color field survey density numbers of each tertiary colour target figure
According to；
First processing module, for measurement density data, the three colors field survey density according to each tertiary colour target figure
Data and printing standard density data determine target Nelson's coefficient；
Second processing module, for determining target linearization curve according to the target Nelson coefficient.
8. device according to claim 7, which is characterized in that described first obtains module, comprising:
First acquisition submodule, for obtaining step-wedge color target figure according to default input point set；
Second acquisition submodule, the step-wedge for obtaining the step-wedge color target figure measure density and step-wedge maximum measurement density；
It determines submodule, for measuring density and preset multiple Nelson's coefficients according to the step-wedge maximum, determines each
The corresponding canonical reference density of Nelson's coefficient；
It is fitted submodule, for measuring density and each Nelson's coefficient of canonical reference density fitting acquisition according to the step-wedge
Corresponding alternative linearization curve.
9. device according to claim 7, which is characterized in that the first processing module, comprising:
First processing submodule, for close according to the measurement density data of each tertiary colour target figure, the three colors field survey
Degree evidence and the corresponding printing standard density data of the default sampling point set, determine each point in the default sampling point set
Calculating standard density；
Second processing submodule, for according to the calculating standard density of each point in the default sampling point set and the default sampling
The measurement density data of the corresponding tertiary colour target figure of point set determines the corresponding mean difference ratio of each Nelson's coefficient；
Third handles submodule, for determining target Nelson's coefficient according to the corresponding mean difference ratio of each Nelson's coefficient.
10. device according to claim 9, which is characterized in that the first processing submodule is specifically used for:
Obtain the default corresponding printing standard density data of sampling point set；
Calculate the ratio between three color field survey density and printing standard density curve vertex density；
According to the ratio between three color field survey density and printing standard density curve vertex density, default sampling point set is determined
The calculating standard density of middle each point.
11. device according to claim 9, which is characterized in that the second processing submodule is specifically used for:
According to the tertiary colour target corresponding with the default sampling point set of the calculating standard density of each point in the default sampling point set
The measurement density data of figure calculates the difference ratio of each point in the default sampling point set；
According to the difference ratio of each point in default sampling point set, calculates and obtain the corresponding mean difference ratio of each Nelson's coefficient.
12. device according to claim 9, which is characterized in that the third handles submodule, is specifically used for: most by value
Nelson's coefficient corresponding to small mean difference ratio is determined as the target Nelson coefficient.
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