CN107703064B - Method for classifying colors of natural colored cotton - Google Patents
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Abstract
The invention relates to a method for classifying colors of natural colored cotton. Collecting spectrum information and chromaticity information of natural colored cotton and standard sample white cotton through a color measuring instrument, developing a color grading experiment of a colored cotton sample by an organization professional, taking an average value of chromaticity values of all colored cotton samples of each grade after visual grading, calculating grade color difference of the colored cotton samples of each grade and the white cotton, establishing and optimizing a mathematical relation between a grade color difference calculated value of the colored cotton sample and the color grade, substituting the grade color difference value of the colored cotton sample into the color grading formula, and determining the color grade of the colored cotton sample. The method can be used for classifying the colors of the natural colored cotton instead of sensory evaluation, and the common color measuring instrument can be used for rapidly and accurately classifying the colors of the colored cotton, so that the operation is simple.
Description
Technical Field
The invention relates to a method for classifying colors of natural colored cotton. And collecting spectral information and chromaticity information of the natural colored cotton through a color measuring instrument, and selecting white cotton as a standard sample and carrying out grade color difference calculation on a sample to be measured of the colored cotton. The color grading experiment of the color cotton sample is carried out by organization professionals, the mathematical relation between the color difference calculated value of the color cotton sample grade (color difference of the color cotton sample and standard white cotton sample) and the color grade is established and optimized, the color grade of the natural color cotton sample can be rapidly and accurately graded, and the color grade grading method belongs to the technical field of color grade grading.
Background
Cotton is used as an important cash crop, and has a long planting history in China. The white cotton is spun, dyed and processed to finally become a product with various colors in life. In order to reduce pollution caused by printing and dyeing links, natural colored cotton with color is cultivated by adopting a transgenic biotechnology method. Among them, colored cotton that has been practically used is brown cotton and green cotton.
The color quality of the natural colored cotton is a main basis for evaluating the overall quality of the colored cotton in the processes of purchasing, circulating, selling and the like of the colored cotton. However, at present, no method and related standard for grading the color of natural colored cotton exist, and sensory evaluation is mainly adopted for grading and evaluating the color of the colored cotton in actual production to judge whether the colored cotton has color.
The existing research on the color grade of white cotton is mature, and China issuesIs part 1 of the national standard GB 1103.1-2012 cotton: in sawtooth processing fine cotton floss, the color grade of white cotton is used as a main index for quality evaluation, and text description and grade diagram of cotton color grading are given by combining the characteristics of cotton in China on the basis of American cotton standard. Color grade chart the cotton color grade was evaluated using the yellow depth +b and reflectance Rd of the Nikksen-Hunter coordinate system. The Nikken-Hunter coordinate system is not a common color characterization method and the national standard prescribed color measuring instrument high volume fiber tester (HVI) is relatively expensive, document Devron Tiboteaux, james Rodges, jacqueline Campbell, james Knowlton. HVI color standard and related feasibility analysis of International color Difference measurement equation (CIELAB) coordinates [ J]Chinese fiber inspection, 2010, (23): 60-63, try to use L * a * b * The coordinates describe the color of cotton. Finding CIELAB color parameter L * ，b * And the HVI color parameters Rd, +b have good correlation. The Chinese patent application CN104048760 'a cotton color objective rating method' establishes the relation between the measurement results of the textile colorimeter and the high-capacity cotton fiber tester through the measurement of white cotton color grade standard samples. Chinese patent application CN103398956, a cotton color measurement method, establishes a multiple linear regression model of CIELAB color system based on Rd and +b in an HVI color system by constructing a color measurement platform. In the color grade division of white cotton, white cotton which does not yellow is a superior product, but in the textile mixed yarn, natural colored cotton with bright color is hopeful high-quality cotton, which is not in accordance with the standard of large yellow depth and poor cotton quality in the color grade of white cotton. Therefore, the white cotton color grading standard is not applicable to colored cotton.
Therefore, providing a method suitable for color classification of natural colored cotton becomes a technical problem which needs to be solved in the technical field.
Disclosure of Invention
The invention aims to determine a method for classifying colors of natural colored cotton, which can be used for classifying the color grades of different colored cotton. And collecting spectral information and chromaticity information of a color cotton sample to be measured by adopting a color measuring instrument, selecting white cotton with small yellow depth and brighter color as a standard sample, and calculating a grade color difference value of the standard sample white cotton and the color cotton to be measured. And determining color grade division standards of the colored cotton according to the calculated color difference value. The color grade of the color cotton sample can be judged rapidly and accurately by the method, so that the quality of the color cotton sample is judged, and the circulation of the color cotton is facilitated. The influence of subjectivity and instability of sensory evaluation on color quality evaluation of colored cotton is avoided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for classifying colors of natural colored cotton, comprising the following steps:
(1) Selecting a plurality of color cotton samples and white cotton standard samples with uniform colors, preparing uniform opaque cotton layers, and respectively placing the uniform opaque cotton layers into a container for storage and numbering;
(2) Collecting and recording spectral information and chromaticity information of each colored cotton sample and each white cotton standard sample by adopting a color measuring instrument;
(3) Carrying out grading evaluation experiments on the color cotton samples by organization professionals, and dividing the color cotton samples into more than 2 different grades according to color appearance differences;
(4) Calculating L of color cotton samples of each grade of more than 2 grades * 、a * 、b * Average value of chromaticity value;
(5) Calculating the chromatic aberration between the average value of the chromatic value of each grade of colored cotton sample and the white cotton standard sample to obtain a grade chromatic aberration value;
(6) Establishing and optimizing a mathematical relation between the color cotton grade and the grade color difference value calculated in the step (5) to be used as a color grading formula of the color cotton;
(7) Preparing a color cotton sample to be measured into a uniform opaque cotton layer, placing the uniform opaque cotton layer into a container, and collecting and recording spectral information and chromaticity information of the color cotton sample to be measured by adopting a color measuring instrument; calculating the grade color difference value of the color cotton sample to be measured and the white cotton standard sample; substituting the grade color difference value into the color grading formula of the colored cotton in the step (6), and calculating the color grade of the colored cotton sample to be measured.
In the step (1), the color cotton samples comprise brown cotton or green cotton, and the number of the brown cotton or green cotton samples can be between 5 and 50 (the number is as high as possible) The method comprises the steps of carrying out a first treatment on the surface of the The white cotton standard sample is white cotton with high reflectivity and small yellow depth, and has a chromaticity value of L * Greater than 85.0, C * Less than 10.0. The color uniformity refers to the uniformity of the sensory evaluation color and no impurity, the light-impermeability refers to the observation under sunlight, and the sample is transmitted in a dark state so as to ensure that the sample information collected by the color measuring instrument is not influenced by the background color.
In the step (1), as shown in fig. 1, the container is a paper box made of black paperboard, the size of the paper box is 10cm (length) ×10cm (width) ×1cm (height), a circular hole area for placing cotton samples is arranged in the center of the paper box, and the diameter of the paper box is 4cm, namely, the color information acquisition area of colored cotton and white cotton standard samples. 1g of cotton samples with uniform color are selected to prepare uniform opaque cotton layers with the thickness of about 1cm, and the cotton samples are put into a container for storage, numbered with numbers and marked on paper boxes, such as 1,2,3 and … ….
In the step (2), the color measuring instrument is an integrating sphere type spectrophotometer, the measuring condition is a D65 illumination light source, a 10-degree view field comprises specular reflection light, the measuring spectral range is 400-700 nm, the interval is 10nm, and the illumination and observation geometric condition is D/8 (diffuse reflection light illumination, 8-degree view angle detection deviating from the normal direction).
In the step (2), in order to avoid errors and instability of single measurement, multiple measurements are required to be performed on the sample, spectrum information and chromaticity information of different areas with uniform colors are collected and recorded on the sample each time, and the average value of the multiple measurement results represents the color information of the sample to be measured.
In the step (3), the classification evaluation test (visual evaluation test) was conducted by referring to the standard observation conditions specified by CIE, simulating the illumination of sunlight D65, the illuminance of the light source being about 700lx, and the observation background being L * Uniform gray of=50, geometric observation condition is 45/0.
In the step (3), the professional is the relevant personnel who work in the cultivation, quality detection, acquisition and other works of colored cotton, wherein the color vision is normal.
In the step (3), the number of the above 2 different color grades is defined according to the number of the color cotton samples to be evaluated and the color distribution range. If the color distribution range of the colored cotton sample is wider, the colored cotton sample can be divided into 5-6 grades, otherwise, the colored cotton sample can be divided into 2-3 grades. Professional personnel carry out grading evaluation experiments on the color cotton samples, and the existing color cotton samples are classified into 2-6 different grades according to the color appearance differences according to the number and the color distribution range of the color cotton samples.
In the step (5), the average value of the chromaticity value of each grade color cotton sample and the grade color difference value of the white cotton standard sample are delta E G The color difference value is calculated as
Wherein->
L * s ，a * s ，b * s Is the chromaticity value of white cotton standard sample, L * P ，a * P ，b * P Is the chromaticity value of the color cotton sample. Since the color cotton samples to be classified are color cotton of the same color tone, only the brightness and chroma effects of the color cotton samples are considered.
In the step (6), the mathematical relation can be optimized and established by adopting a linear or power exponent method, and the mathematical relation between the color grade of the color cotton sample and the grade color difference value of the color cotton sample is established.
In the step (7), when calculating the color grade of the color cotton sample to be evaluated through a color grading formula of the color cotton, determining the final color grade of the color cotton by adopting a rounding method.
The mathematical relation of color difference and color Grade between the color cotton sample and the white cotton standard sample is grade=17.7e -0.07ΔEG 。
According to the method for grading the colors of the natural colored cottons, through uniformly manufacturing a colored cotton sample to be measured and a standard sample white cotton sample, collecting spectral information and chromaticity information of the colored cotton sample by adopting an integrating sphere spectrophotometer, and selecting white cotton as the standard sample and the colored cotton sample to be measured for color difference calculation. The color grading experiment of the color cotton sample is carried out by the organization professional, so that a mathematical relation between the color grade of the color cotton sample and the calculated value of the grade color difference (the color difference of the color cotton sample and the white cotton standard sample) is established and optimized, and the color grade of the natural color cotton can be rapidly and accurately graded.
The natural colored cotton color grading method can replace sensory evaluation to objectively evaluate and grade the color of the colored cotton, and provides a powerful basis for quality evaluation in the circulating process of the colored cotton.
Drawings
Fig. 1 is a sample object diagram of a sample to be measured of the prepared standard white cotton and natural colored cotton.
Fig. 2 is a hierarchical object diagram of a natural colored cotton sample.
Fig. 3 is a graph showing the calculated color difference scatter distribution of the color grade of natural colored cotton and the average chromaticity value of the samples of each grade.
Fig. 4 is a distribution chart of calculated grade and visual grade scatter of natural colored cotton.
Detailed Description
The invention relates to a method for grading colors of natural colored cotton, which is characterized in that a sample to be tested of the colored cotton and standard white cotton are uniformly manufactured, and an integrating sphere spectrophotometer is used for collecting spectrum information and chromaticity information of the sample of the colored cotton and the standard white cotton. The color grading experiment of the natural colored cotton is carried out by the organization professional, the average value of the chromaticity values of the colored cotton samples to be tested in each grade after the grading experiment is calculated, and the average value is compared with the standard sample white cotton, so as to calculate the color difference. And optimizing and establishing a mathematical relationship between the grade color difference value and the colored cotton grades 1,2 and 3 … …. And calculating the grade color difference value of the standard sample white cotton and each color cotton sample to be detected, substituting the grade color difference value into the mathematical relation, and dividing the color grade of each color cotton sample to be detected.
The spectral energy distribution and the chromaticity value of the natural colored cotton and the standard sample white cotton are measured by using an integrating sphere spectrophotometer, the grade color difference value of the standard sample white cotton is calculated, and the color grade of the colored cotton sample to be measured is divided, wherein the specific steps are as follows:
(1) 1g of brown cotton sample and white cotton standard sample with uniform color are selected to prepare uniform opaque cotton layers with the thickness of about 1cm, and the uniform opaque cotton layers are put into a container for storage and numbering, wherein the numbers of the brown cotton samples are 1,2 and 3 … … respectively.
(2) The chromaticity information and the spectrum information of No. 1-55 brown cotton samples and white cotton standard samples are respectively collected and recorded by using an X-Rite SP64 spectrophotometry, three area measurements with uniform color in the range of each measurement area are selected each time, each sample is measured four times, and the average L of 12 measurements is measured * a * b * The chromaticity values are shown in table 1.
TABLE 1 chromaticity values of Brown and white cotton samples
(3) The level color difference values of white cotton standard samples compared with each color cotton sample to be tested under D65 illuminant and CIE1964 standard observer conditions were calculated as shown in table 2.
Table 2 grade color difference value of brown cotton sample and white cotton as a standard sample
(4) The sequence of cotton samples to be evaluated is randomly disturbed, a tissue professional develops a color grading experiment of natural colored cotton, an average value of grading each sample by all the participated grading experimenters is taken as a final grading result, as shown in a table 3, and a grading physical diagram is shown in fig. 2:
table 3 visual fractionation results for palm cotton samples
(5) After visual classification, the average of the colorimetric values of all the colored cotton samples in each class is calculated, e.g. L for class 1 for samples No.43, 52, 54 * a * b * Average of the colorimetric values, L of samples No.13, 19 and … … in order 2 * a * b * Average value of chromaticity values. The calculated average is shown in table 4:
table 4 various grades of colored cotton sample L * a * b * Average value of
(6) Calculating the level color difference value of the average value of the color values of each level and the white cotton standard sample, and drawing a scattered point distribution diagram of the color cotton level and the calculated color difference value, as shown in fig. 3;
(7) Linear fitting or power exponent fitting of mathematical relationship of color cotton sample to white cotton standard color difference and color Grade, and the fitting formula in fig. 3 is grade=17.7e -0.07ΔEG ；
(8) Substituting the color difference between each color cotton sample to be detected and the white cotton standard sample into the mathematical relation in the step (7), and calculating the color grade of the natural color cotton, as shown in table 4:
table 4 palm fibre sample calculation fractionation
As shown in table 4, 89% of the colored cotton samples were assigned a color rating consistent with the visual color rating. The calculated color grading results for sample nos. 19, 49, 30, 50,5, 27 differ from the visual color grading by 1, and fall within a reasonable error range.
When natural colored cotton (brown cotton or green cotton) is subjected to color grading, a to-be-measured colored cotton sample is only required to be manufactured into a uniform opaque cotton layer according to the method and is put into a container, and a color measuring instrument is adopted to collect and record spectral information and chromaticity information of the to-be-measured colored cotton sample; when measuring the chromaticity value L of the sample to be detected * ≥56.0，10＜C * When the color value of the sample is less than or equal to 34.0, calculating the grade color difference value of the color cotton sample to be measured and the white cotton standard sample; substituting the grade color difference value into the color cotton colorAnd calculating the color grade of the color cotton sample to be measured according to the color grading formula, wherein the calculated result is basically consistent with the visual grading evaluation experimental result. If the colorimetric value L of the sample to be detected is measured * < 56.0 or C > 34.0, C * < 10, the result of the classification can be used as a reference.
According to the method for grading the colors of the natural colored cottons, disclosed by the invention, the color cotton samples to be measured and the standard sample white cottons are uniformly manufactured, the color measuring instrument is adopted to collect the spectrum information and the chromaticity information of the natural colored cottons and the standard sample white cottons, the organization professional develops a color grading experiment of the colored cottons samples, the chromaticity values of all the colored cottons of each grade after visual grading are averaged, and the mathematical relation between the color difference calculated value (the color difference of the colored cottons and the standard sample white cottons) of the colored cottons and the color grade is established and optimized. White cotton is selected as a standard sample, and the color difference value of the standard sample white cotton and a color cotton sample to be measured is calculated. Substituting the color difference value calculated by the color cotton sample into a color grading formula, rounding the calculated result to a value to determine the color grade of the color cotton sample. The method can be used for classifying the colors of the natural colored cotton instead of sensory evaluation, and the common color measuring instrument can be used for rapidly and accurately classifying the colors of the colored cotton, so that the operation is simple.
Claims (8)
1. A method for classifying colors of natural colored cotton, comprising the following steps:
(1) Selecting a plurality of color cotton samples and white cotton standard samples with uniform colors, preparing uniform opaque cotton layers, and respectively placing the uniform opaque cotton layers into a container for storage and numbering;
(2) Collecting and recording spectral information and chromaticity information of each colored cotton sample and each white cotton standard sample by adopting a color measuring instrument;
(3) Carrying out grading evaluation experiments on the color cotton samples by organization professionals, and dividing the color cotton samples into more than 2 different grades according to color appearance differences;
(4) Calculating L of color cotton samples of each grade of more than 2 grades * 、a * 、b * Average value of chromaticity value;
(5) Calculating the chromatic aberration between the average value of the chromatic value of each grade of colored cotton sample and the white cotton standard sample to obtain a grade chromatic aberration value;
(6) Establishing and optimizing a mathematical relation between the color cotton grade and the grade color difference value calculated in the step (5) to be used as a color grading formula of the color cotton;
the average value of the chromaticity value of each grade of colored cotton sample and the grade color difference value of the white cotton standard sample are delta E G The color difference value is calculated as
Wherein->
L * s ，a * s ，b * s Is the chromaticity value of white cotton standard sample, L * P ，a * P ，b * P The color value is the chromaticity value of the color cotton sample;
optimizing and establishing a mathematical relation between the color grade of the colored cotton sample and the grade color difference value by adopting a power exponent method;
the mathematical relation of the chromatic aberration and the color Grade of the power exponent fitting colored cotton sample and the white cotton standard sample is grade=17.7e -0.07ΔEG ；
(7) Preparing a color cotton sample to be measured into a uniform opaque cotton layer, placing the uniform opaque cotton layer into a container, and collecting and recording spectral information and chromaticity information of the color cotton sample to be measured by adopting a color measuring instrument; calculating the grade color difference value of the color cotton sample to be measured and the white cotton standard sample; substituting the grade color difference value into the color grading formula of the colored cotton in the step (6), and calculating the color grade of the colored cotton sample to be measured.
2. The method for classifying colors of natural colored cottons according to claim 1, characterized in that: the color cotton sample comprises brown cotton or green cotton.
3. The method for classifying colors of natural colored cottons according to claim 1, characterized in that: the container is a paper box made of black paperboard, and a circular hole area for placing cotton samples is arranged in the center of the paper box.
4. The method for classifying colors of natural colored cottons according to claim 1, characterized in that: 1g of cotton sample was selected to prepare a uniform opaque cotton layer 1cm thick.
5. The method for classifying colors of natural colored cottons according to claim 1, characterized in that: the color measuring instrument is an integrating sphere type spectrophotometer, the measuring condition is a D65 illumination light source, a 10-degree view field comprises specular reflection light, the measuring spectral range is 400-700 nm, the interval is 10nm, and the illumination and observation geometric condition is D/8.
6. The method for classifying colors of natural colored cottons according to claim 1, characterized in that: in the grading evaluation experiment, the standard observation condition regulated by CIE is referred to, the illumination of sunlight D65 is simulated, the illumination of a light source is 700lx, and the observation background is L * Uniform gray of=50, geometric observation condition is 45/0.
7. The method for classifying colors of natural colored cottons according to claim 1, characterized in that: the number of the color grades is defined according to the number of the color cotton samples to be detected and the color distribution range and is divided into 2-6 grades.
8. The method for classifying colors of natural colored cottons according to claim 1, characterized in that: when calculating the color grade of the color cotton sample to be evaluated through the color grading formula of the color cotton, determining the color grade of the color cotton by adopting a rounding method.
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| CN110887797A (en) * | 2019-11-20 | 2020-03-17 | 武汉纺织大学 | Color difference analysis method of colored textile fabric |
| CN114018928B (en) * | 2021-11-26 | 2022-09-06 | 国检中心深圳珠宝检验实验室有限公司 | Emerald green color grading liquid standard sample and preparation method thereof |
| CN114136959A (en) * | 2021-11-27 | 2022-03-04 | 北京中医药大学 | Urine color quantification method and classification standard |
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