CN107703064A - A kind of method of natural color-cotton color grading - Google Patents
A kind of method of natural color-cotton color grading Download PDFInfo
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- CN107703064A CN107703064A CN201710714577.2A CN201710714577A CN107703064A CN 107703064 A CN107703064 A CN 107703064A CN 201710714577 A CN201710714577 A CN 201710714577A CN 107703064 A CN107703064 A CN 107703064A
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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Abstract
The present invention relates to a kind of method of natural color-cotton color grading.Natural color-cotton and the spectral information and chrominance information of the white cotton of standard specimen are gathered by color measurement instrument, professional is organized to carry out the color grading experiment of color cotton sample sheet, the chromatic value of each all color cotton sample sheets of grade after visually classification is averaged, calculate the grade aberration of each grade coloured silk cotton sample product and white cotton, establish and optimize color this grade of cotton sample Colorimetry value and the relationship of color grade, the grade value of chromatism of color cotton sample sheet is substituted into color grading formula, it is determined that the color grade of color cotton sample sheet.This method can be used for replacing sensory evaluation to carry out grade classification to natural color-cotton color, and grade classification can be fast and accurately carried out to color cotton color using conventional color measurement instrument, simple to operate.
Description
Technical field
The present invention relates to a kind of method of natural color-cotton color grading.The light of natural color-cotton is gathered by color measurement instrument
Spectrum information and chrominance information, white cotton is selected to carry out grade Colorimetry as standard specimen and color cotton testing sample.Organize professional
Carry out the color grading experiment of color cotton sample sheet, establish and optimize color this grade of cotton sample Colorimetry value (color cotton sample sheet and standard specimen are white
Cotton aberration) and color grade relationship, can fast and accurately carry out natural color-cotton sample color grade division, category
In color grade partitioning technology field.
Background technology
Cotton has long plantation history in China as important industrial crops.Spinned, printed by dialogue cotton
Dye and processing, eventually become the product that color is various in life.In order to reduce the pollution that printing and dyeing link is brought, using transgenosis
Biotechnology method, cotton-wool is cultivated and has grown out just with coloured natural color-cotton.Wherein, practical application is had been able to
Color cotton is brown cotton and green cotton.
The quality of colour of natural color-cotton is that color cotton total quality is evaluated during purchase, circulation, sale of color cotton etc.
Main Basiss.But at present not to the method and relevant criterion of natural color-cotton color grading, to color cotton color in actual production
Grading evaluation mainly use sensory evaluation, judge whether color cotton has color.
The research of existing dialogue cotton color grade is more ripe, the national standard that China promulgates《GB 1103.1-2012 cottons the 1st
Part：Sawtooth processes medium staple cotton》In, the leading indicator using the color grade of white cotton as quality evaluation, and in american cotton mark
The characteristics of Cotton in China is combined on the basis of standard gives the word description and grade figure of cotton color grading.Color grade figure is adopted
Cotton color grade is evaluated with the yellow depth+b and reflectivity Rd of Nickerson-Hunter coordinate system.Nickerson-Hunter coordinate
System is not conventional characterization method, and the color measurement instrument Large Copacity fiber tester (HVI) of national regulations
Costly, document《Devron Tibodeaux,James Rodgers,Jacqueline Campbell,James
Knowlton.HVI color standards and related feasibility analysis [J] China of international aberration measure formula (CIELAB) coordinate are fine
Inspection, 2010, (23):60-63》, attempt with L*a*b*Coordinate describes the color of cotton.It was found that CIELAB color parameters L*, b*And HVI
Color parameter Rd ,+b have good correlation.A kind of Chinese invention patent application CN104048760 " objective gradings of cotton color
Method " establishes textile chromascope and Large Copacity cotton fiber tester measurement knot by the measurement of dialogue cotton color level standard specimen
Relation between fruit.Chinese invention patent application CN103398956 " a kind of method of cotton colour examining " is by building color measuring
Platform, establish the multiple linear regression model of the CIELAB color systems based on Rd in HVI color systems ,+b.The color of white cotton
In grade classification, pure white and non-yellowing cotton is high-class product, but in the mixed yarn of weaving, brightly painted natural color-cotton is people
Desired high quality cotton, this is big with yellow depth in white cotton color grade, and the standard of cotton quality difference is not inconsistent.Therefore, Bai Mianyan
The colour gradation criteria for classifying is to color cotton and does not apply to.
Therefore it provides a kind of method suitable for natural color-cotton color grading just turns into the skill that the technical field is badly in need of solving
Art problem.
The content of the invention
It is an object of the invention to determine a kind of method of natural color-cotton color grading, it can be used to divide the face of different color cottons
Colour gradation.The spectral information and chrominance information of color cotton sample product to be measured are gathered using color measurement instrument, select yellow depth small and
More bright white cotton is as standard specimen, the grade value of chromatism of the calculating white cotton of standard specimen and color cotton to be measured.According to calculating value of chromatism, it is determined that
The color cotton color grade criteria for classifying.The color grade of color cotton sample product can be fast and accurately judged by this method, so as to judge
The quality of color cotton sample product, the circulation of more conducively color cotton.Avoid sensory evaluation subjectivity and unstability to color cotton color matter
The influence that amount evaluation is brought.
To achieve the above object, the present invention takes following technical scheme：
A kind of method of natural color-cotton color grading, comprises the following steps：
(1) multiple colors uniformly color cotton sample sheet and white cotton standard specimen are chosen, uniform light tight cotton layer is made, is respectively put into
Preserve and number in container；
(2) color measurement instrument is used, gathers and records the spectral information and colourity of each color cotton sample sheet and white cotton standard specimen
Information；
(3) tissue professional is to color this progress of cotton sample grading evaluation experiment, by color cotton sample sheet according to color appearance difference
It is divided into more than 2 different grades；
(4) L of each grade coloured silk cotton sample sheet in 2 ratings above is calculated*、a*、b*Chromatic value average value；
(5) aberration of the chromatic value average value with white cotton standard specimen of each grade coloured silk cotton sample sheet is calculated, obtains grade value of chromatism；
(6) establish and optimize color cotton grade and the relationship of the grade value of chromatism calculated in step (5), as color cotton
Color grading formula；
(7) color cotton sample to be measured is originally made into uniform light tight cotton layer to be put into container, using color measurement instrument, collection
And record the spectral information and chrominance information of color cotton sample sheet to be measured；Calculate the grade aberration of color cotton sample sheet to be measured and white cotton standard specimen
Value；The color cotton color grading formula that grade value of chromatism is substituted into step (6), calculate the color grade of color cotton sample sheet to be measured.
In step (1), described color cotton sample sheet includes brown cotton or green cotton, and the number of brown cotton or green cotton sample sheet can be at 5-50
Between (number should be The more the better)；The white cotton standard specimen is that reflectivity is higher and the less white cotton of yellow depth, such as its colourity
It is worth for L*More than 85.0, C*Less than 10.0.Color uniformly refers to sensory evaluation color uniformly and free from admixture, light tight to refer in day
Observed under light, sample and unglazed transmission, to ensure that the sample information of color measurement instrument collection is not influenceed by background colour.
In step (1), described container, as shown in figure 1, be carton made of black paperboard, size be 10cm (length) ×
10cm (width) × 1cm (height), carton centers set the circular bore region of a placement cotton sample, a diameter of 4cm, as color cotton
With white cotton standard specimen colouring information pickup area.Get colors uniform each 1g of cotton sample, be made thickness 1cm or so uniformly not
Printing opacity cotton layer, is put into container and preserves, and color cotton sample is originally numbered and marked on carton with numeral, and such as 1,2,3 ... ....
In step (2), described color measurement instrument is integrating sphere type spectrophotometer, and its measuring condition illuminates for D65
Light source, 10 ° of visual fields, comprising specular light, measure spectrum scope is 400nm-700nm, and at intervals of 10nm, illumination is several with observing
What condition is d/8 (diffuse illumination, the visual angle detection of 8 ° of off-normal direction).
In step (2), to avoid the error of single measurement and unstability, sample need to be taken multiple measurements, existed every time
The uniform different zones of color are selected to gather and record its spectral information and chrominance information on sample, with the flat of multiple measurement results
Average represents the colouring information of testing sample.
In step (3), grading evaluation experiment (visual valuation experiment) standard sight condition, simulating sun with reference to as defined in CIE
Light D65 is illuminated, and for light illumination in 700lx or so, observation background is L*=50 uniform grey, geometry observation condition are 45/0.
In step (3), described professional is that colour vision is normal, is engaged in the work such as color cotton cultivation, quality testing and purchase
Related personnel.
In step (3), the number of more than described 2 different color grades need to be according to color cotton sample sheet to be evaluated
Quantity and distribution of color scope define.If color this distribution of color of cotton sample scope is wider, 5-6 grade can be divided into, on the contrary can
Divide 2-3 grade.Professional is to color this progress of cotton sample grading evaluation experiment, according to the quantity and distribution of color of color cotton sample sheet
Scope, existing color cotton sample sheet is divided into 2-6 different grades according to color appearance difference.
In step (5), the grade value of chromatism of the chromatic value average value and white cotton standard specimen of described each grade coloured silk cotton sample sheet is
ΔEGValue of chromatism, its calculation formula areWherein
L* s, a* s, b* sFor the chromatic value of white cotton standard specimen, L* P, a* P, b* PFor the chromatic value of color cotton sample sheet.Due to color cotton sample sheet to be fractionated
For the color cotton of same tone, the lightness and chroma for only considering color cotton sample sheet influence.
In step (6), described relationship, linear or power exponent method can be used, optimizes and establishes color cotton sample
Relationship between the grade value of chromatism of this color grade and color cotton sample sheet.
In step (7), when calculating color this color grade of cotton sample to be evaluated by color cotton color grading formula, using four houses five
The method entered, it is determined that the final color grade of color cotton.
Linear fit or power exponent are fitted color cotton sample sheet and the relationship of white cotton standard specimen aberration and color grade, are
Grade=17.74e-0.07ΔEG。
The method of the natural color-cotton color grading of the present invention, color cotton sample to be tested and the white cotton sample of standard specimen are made by unified
This, the spectral information and chrominance information of color cotton sample sheet are gathered using integrating sphere type spectrophotometer, select white cotton as standard specimen and
Color cotton testing sample carries out Colorimetry.Organize professional to carry out the color grading experiment of color cotton sample sheet, and then establish and excellent
Change the relationship between color this color grade of cotton sample and grade Colorimetry value (color cotton sample sheet and white cotton standard specimen aberration), can be fast
Speed, the color grade division for accurately carrying out natural color-cotton.
By the natural color-cotton color grading method of the present invention, sensory evaluation can be replaced to carry out objective comment to color cotton color
Valency, classification, strong foundation is provided for the quality evaluation in the color cotton process of circulation.
Brief description of the drawings
Fig. 1 is the white cotton of standard specimen and natural color-cotton testing sample pictorial diagram made.
Fig. 2 is natural color-cotton sample classification pictorial diagram.
Fig. 3 is that natural color-cotton color grade and each grade sample mean chromatic value calculate aberration scatter diagram.
Fig. 4 is that natural color-cotton calculates grade and Macroscopic score scatter diagram.
Embodiment
The present invention is a kind of method of natural color-cotton color grading, unified to make color cotton testing sample and the white cotton of standard specimen, is made
Color cotton sample product and the spectral information and chrominance information of the white cotton of standard specimen are gathered with integrating sphere type spectrophotometer.Tissue professional opens
The color grading experiment of natural color-cotton is opened up, calculates the chromatic value average value of color cotton sample product to be measured in each grade after classification is tested, with
The white cotton of standard specimen is compared, and calculates aberration.The mathematical relationship of grade value of chromatism and color cotton grade 1,2,3 ... is established in optimization.Calculate
The white cotton of standard specimen and the grade value of chromatism of each color cotton sample product to be measured, substitute into above-mentioned relationship, each color cotton sample to be measured originally can be entered
The division of row color grade.
Use integrating sphere type spectrophotometer measurement natural color-cotton and the spectral power distribution and chromatic value of the white cotton of standard specimen, meter
The grade value of chromatism with the white cotton of standard specimen is calculated, the color grade of color cotton sample sheet to be measured is divided, comprises the following steps that：
(1) get colors uniform brown cotton sample product to be measured and white each 1g of cotton standard specimen, and the uniform impermeable of thickness 1cm or so is made
Light cotton layer, is put into container and preserves and number, and brown cotton sample number is respectively 1,2,3 ... 55.
(2) gather, record the color of No. 1-55 brown cotton sample product and white cotton standard specimen respectively using X-Rite SP64 spectrophotometers
Information and spectral information are spent, selects uniform three area measures of color in the range of measured zone every time, each sample measures altogether
Four times, the average L of 12 measurements*a*b*Chromatic value is as shown in table 1.
The chromatic value of the brown cotton sample product of table 1 and white cotton standard specimen
(3) calculate under the conditions of D65 working flares and CIE1964 standard observers, white cotton standard specimen and each color cotton sample product to be measured
The grade value of chromatism compared, as shown in table 2.
The brown cotton sample product of table 2 and the grade value of chromatism of the white cotton of standard specimen
(4) order of cotton sample to be evaluated is upset at random, tissue professional carries out the color grading of natural color-cotton
Experiment, all average values for participating in classification experimenter and being classified to each sample are taken, as final classification results, such as table
Shown in 3, classification pictorial diagram is as shown in Figure 2：
The brown cotton sample items of table 3 regard classification results
(5) after calculating visually classification, the average value of all color this chromatic values of cotton sample in each grade, as calculated in grade 1
NO.43, the L of 52,54 samples*a*b*Chromatic value average value, NO.13, the L of 19 ... 49 samples are calculated in grade 2*a*b*Chromatic value
Average value.It is as shown in table 4 to calculate average value：
Each this L of grade coloured silk cotton sample of table 4*a*b*Average value
(6) the grade value of chromatism of each grade chromatic value average value and white cotton standard specimen is calculated, draws color cotton grade with calculating color
The scatter diagram of difference, as shown in Figure 3；
(7) linear fit or power exponent are fitted color cotton sample sheet and the relationship of white cotton standard specimen aberration and color grade,
Fitting formula in Fig. 3 is Grade=17.74e-0.07ΔEG；
(8) relationship for substituting into the aberration of each color cotton sample sheet to be measured and white cotton standard specimen in step (7), calculate natural
The color grade of color cotton, as shown in table 4：
The brown cotton sample product of table 4 calculate classification situation
As shown in table 4,89% color this calculating of cotton sample color grade is consistent with visual color grade.NO.19,49,30,
The calculating color grading result of 50,5, No. 27 samples differs 1 grade with visual color grade, belongs to rational error range.
When carrying out natural color-cotton (brown cotton or green cotton) color grading, it is only necessary to by color cotton sample to be measured originally according to the method described above
Uniform light tight cotton layer is made to be put into container, using color measurement instrument, gathers and records the spectrum of color cotton sample sheet to be measured
Information and chrominance information；As the chromatic value L for measuring sample to be detected*>=56.0,10 ＜ C*≤ 34.0, in the sample color of this method
When in the range of angle value, the grade value of chromatism of color cotton sample sheet to be measured and white cotton standard specimen can be calculated；Grade value of chromatism is substituted into above-mentioned
Color cotton color grading formula, calculate the color grade of color cotton sample sheet to be measured, result of calculation and visual grading evaluation experimental result base
This is consistent.If as the chromatic value L for measuring sample to be detected*＜ 56.0 or C* ＞ 34.0, C*＜ 10, classification results can be used as ginseng
Examine.
The method of the natural color-cotton color grading of the present invention, it is unified to make color cotton sample sheet and the white cotton sample sheet of standard specimen to be measured, adopt
Natural color-cotton sample and the spectral information and chrominance information of the white cotton of standard specimen are gathered with color measurement instrument, tissue professional carries out
The color grading experiment of color cotton sample sheet, the chromatic value of each all color cotton sample sheets of grade after visually classification is averaged, established simultaneously
Optimize color this grade of cotton sample Colorimetry value (color cotton sample sheet and the white cotton aberration of standard specimen) and the relationship of color grade.Selection
White cotton calculates the white cotton of standard specimen and the value of chromatism of color cotton sample sheet to be measured as standard specimen.The value of chromatism of color this calculating of cotton sample is substituted into face
Color is classified formula, and the value that rounded up to result of calculation determines the color grade of color cotton sample sheet.This method can be used for replacing sense
Official's evaluation carries out grade classification to natural color-cotton color, can be fast and accurately to color cotton using conventional color measurement instrument
Color carries out grade classification, simple to operate.
Claims (10)
1. a kind of method of natural color-cotton color grading, comprises the following steps：
(1) multiple colors uniformly color cotton sample sheet and white cotton standard specimen are chosen, uniform light tight cotton layer is made, is respectively put into container
Middle preservation is simultaneously numbered；
(2) color measurement instrument is used, gathers and records the spectral information and chrominance information of each color cotton sample sheet and white cotton standard specimen；
(3) color cotton sample sheet is divided into 2 by tissue professional to color this progress of cotton sample grading evaluation experiment according to color appearance difference
Different grade more than individual；
(4) L of each grade coloured silk cotton sample sheet in 2 ratings above is calculated*、a*、b*Chromatic value average value；
(5) aberration of the chromatic value average value with white cotton standard specimen of each grade coloured silk cotton sample sheet is calculated, obtains grade value of chromatism；
(6) establish and optimize color cotton grade and the relationship of the grade value of chromatism calculated in step (5), as color cotton color
It is classified formula；
(7) color cotton sample to be measured is originally made into uniform light tight cotton layer to be put into container, using color measurement instrument, gathers and remember
Record the spectral information and chrominance information of color cotton sample sheet to be measured；Calculate the grade value of chromatism of color cotton sample sheet to be measured and white cotton standard specimen；Will
The color cotton color grading formula that grade value of chromatism is substituted into step (6), calculate the color grade of color cotton sample sheet to be measured.
2. the method for natural color-cotton color grading according to claim 1, it is characterised in that：Described color cotton sample originally includes
Brown cotton or green cotton.
3. the method for natural color-cotton color grading according to claim 1, it is characterised in that：Described container is black paperboard
Manufactured carton, carton centers set the circular bore region of a placement cotton sample.
4. the method for natural color-cotton color grading according to claim 1, it is characterised in that：Choose 1g cotton samples, system
Into thickness 1cm uniform light tight cotton layer.
5. the method for natural color-cotton color grading according to claim 1, it is characterised in that：Described color measurement instrument
For integrating sphere type spectrophotometer, its measuring condition is D65 lighting sources, 10 ° of visual fields, includes specular light, measure spectrum
Scope is 400nm-700nm, and at intervals of 10nm, illumination is d/8 with observation geometrical condition.
6. the method for natural color-cotton color grading according to claim 1, it is characterised in that：When grading evaluation is tested, ginseng
According to standard sight condition as defined in CIE, the D65 illuminations of simulation daylight, light illumination 700lx, observation background is L*=50 it is equal
Even grey, geometry observation condition are 45/0.
7. the method for natural color-cotton color grading according to claim 1, it is characterised in that：Of described color grade
Number, defines according to the quantity of color cotton sample sheet to be measured and distribution of color scope, is divided into 2-6 grade.
8. the method for natural color-cotton color grading according to claim 1, it is characterised in that：Described each grade coloured silk cotton sample
This chromatic value average value is Δ E with the grade value of chromatism of white cotton standard specimenGValue of chromatism, its calculation formula areWhereinL* s, a* s, b* sFor Bai Mianbiao
The chromatic value of sample, L* P, a* P, b* PFor the chromatic value of color cotton sample sheet.
9. the method for natural color-cotton color grading according to claim 1, it is characterised in that：Using linear or power exponent
Method, the relationship for optimizing and establishing between color this color grade of cotton sample and grade value of chromatism.
10. the method for natural color-cotton color grading according to claim 1, it is characterised in that：Pass through color cotton color grading
When formula calculates color this color grade of cotton sample to be evaluated, using the method to round up, it is determined that the color grade of color cotton.
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| CN107703064B (en) | 2023-06-30 |
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