CN116519693A - Quantitative measurement method for Hetian jade color - Google Patents
Quantitative measurement method for Hetian jade color Download PDFInfo
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Abstract
The invention discloses a quantitative measurement method of Hetian jade color, which comprises the following steps: placing the surface-cleaned Hetian jade at a test port of a measuring instrument, and placing a polytetrafluoroethylene plate at one side of the Hetian jade to enable the Hetian jade to be positioned between a white board and the measuring instrument, wherein the length and the width of the white board are not smaller than those of Yu Hetian jade; the instrument parameters and the test conditions of the measuring instrument are configured; starting the measuring instrument to perform spectrum measurement on the Hetian jade so as to obtain a spectrum response value corresponding to the Hetian jade; and calculating according to the spectral response value and the spectral reflection formula to obtain the spectral reflectance of the corresponding Hetian jade, and calculating according to the spectral reflectance and the chromaticity calculation formula to obtain the corresponding chromaticity coordinate. The invention quantitatively measures the color of the Hetian jade by using the integrating sphere spectrophotometer, and quantitatively characterizes the color of the Hetian jade by using the chromaticity coordinates, thereby improving the accuracy of color identification of the Hetian jade.
Description
Technical Field
The invention relates to the technical field of Hetian jade color identification, in particular to a quantitative measurement method and device for Hetian jade color.
Background
At present, no unified and objective standard method exists for quantitative measurement of the color of the Hetian jade at home and abroad, and in the current GSB 16-3061-2013 Standard sample of Hetian jade object, GB/T38821-2020 Standard of Hetian jade appraisal and Classification, the evaluation (measurement) of the color of Hetian jade is based on a sensory evaluation method, namely visual observation and language description, or a visual observation and color comparison operation method of a color card, so that the quantitative measurement method has quite large discreteness and random error, and has quite large deviation in the aspect of understanding the quantity value transmission, even if an evaluator is a skilled person after special training, the evaluation is difficult to realize standard and accurate description.
Furthermore, hetian jade is not as detailed as diamond (D-N color) and can be aligned one by one with reference, but only with the lower limit samples (one each) of white jade and bluish white jade in GSB 16-3061-2013, hetian jade real standard sample, and with representative samples (one each) of other varieties. Therefore, the number of the sample standard is limited (only two sets are used nationwide), and the sample standard is limited by conditions such as Tian Yuzhi land and cleanliness, and is difficult to copy.
The following disadvantages exist in evaluating the color of Hetian jade by visual means:
(1) The sensitivity of human eyes to different colors is different, so that the judgment of the colors is affected, and the result is deviated;
(2) Different operators understand different colors and languages, and the descriptions and the explanations of the colors are different;
(3) Different observation environments have great influence on observers, and reproducibility of observation results is influenced;
(4) Only language adjective can be used, no digital information exists, the quantity value cannot be transmitted, and the tracing is difficult;
(5) The labor intensity is high, visual fatigue is easy to generate, and the accuracy of the result is influenced;
(6) The color variety of the Hetian jade is rich, and some colors are not completely consistent with the corresponding color card colors.
The method is greatly affected by environment, human sense and psychology, can not meet the requirements of detection industry and value evaluation, and can not accurately and quantitatively measure the color of the Hetian jade.
Disclosure of Invention
Aiming at the defects, the embodiment of the invention discloses a quantitative measurement method for the color of the Hetian jade, which quantitatively measures the color of the Hetian jade by using an integrating sphere spectrophotometer and quantitatively characterizes the color of the Hetian jade by using chromaticity coordinates, provides a constant value basis for color classification and color grading of the Hetian jade, and improves the accuracy of color identification of the Hetian jade.
The first aspect of the embodiment of the invention discloses a quantitative measurement method of Hetian jade color, which comprises the following steps:
placing the surface-cleaned Hetian jade at a test port of a measuring instrument, and placing a white board on one side of the Hetian jade so that the Hetian jade is positioned between the white board and the measuring instrument, wherein the length and the width of the white board are not smaller than those of Yu Hetian jade; the instrument parameters and the test conditions of the measuring instrument are configured;
starting the measuring instrument to perform spectrum measurement on the Hetian jade so as to obtain a spectrum response value corresponding to the Hetian jade;
and calculating to obtain the corresponding spectral reflectance of the Hetian jade according to the spectral response value and a spectral reflectance formula, wherein the spectral reflectance formula is as follows:
wherein ρ (λ) is the spectral reflectance of the Hetian jade; gamma (lambda) is the spectral response value of Hetian jade; delta 0 (lambda) is the reflection curve of a standard whiteboard;
calculating according to the spectral reflectance and a chromaticity calculation formula to obtain corresponding chromaticity coordinates; and determining the color of the corresponding Hetian jade according to the chromaticity coordinates and the preset numerical comparison.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, after the calculating to obtain the spectral reflectance of the corresponding nephrite, the method includes:
and carrying out position replacement on the Hetian jade so as to carry out re-measurement until the acquisition of the preset number of spectral reflectances is completed.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the configuration of the instrument parameters and the test conditions of the measuring instrument includes:
placing the sample at the instrument test hole, and enabling the sample to completely shield the instrument test hole;
the test wavelength range of the measuring instrument is set to 380-780nm, the measurement wavelength interval is set to 10nm, and a CIE1964 standard chromaticity observer is selected as the standard chromaticity observer.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the chromaticity calculation formula includes a tristimulus value calculation formula and a chromaticity coordinate calculation formula, and the calculating to obtain the corresponding chromaticity coordinate according to the spectral reflectance and the chromaticity calculation formula includes:
calculating to obtain a tristimulus value corresponding to the field jade according to the spectral reflectance and the tristimulus value calculation formula;
calculating to obtain chromaticity coordinates according to tristimulus values and chromaticity coordinate calculation formulas of the Hetian jade;
and executing for a plurality of times, and averaging the tristimulus values and the chromaticity coordinates obtained by the plurality of times of calculation.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the tristimulus value calculation formula is:
wherein X is 10 、Y 10 、Z 10 Is the tristimulus value of the measured Hetian jade; k (k) 10 Is a normalized coefficient; ρ (λ) is the spectral reflectance of the measured Hetian jade; s (λ) is the relative spectral power distribution of the standard illuminant D65;is a CIE1964 standard chromaticity system color matching function; delta lambda is the wavelength interval, taken at 10nm.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the chromaticity coordinate calculation formula is:
L * ＝116f(Y 10 /Y n )-16
a * ＝500[f(X 10 /X n )-f(Y 10 /Y n )]
b * ＝200[f(Y 10 /Y n )-f(Z 10 /Z n )]
wherein L is * 、a * 、b * Chromaticity coordinates of CIE1976 uniform color space for the sample to be measured; x is X 10 、Y 10 、Z 10 The tristimulus value of CIE1964 standard chromaticity system of the tested sample; x is X n 、Y n 、Z n Tristimulus values for CIE standard illuminant D65 under CIE1964 standard chromaticity observer, where X n ＝94.81，Y n ＝100.00，Z n ＝107.32。
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the performing multiple times and averaging the tristimulus values and the chromaticity coordinates obtained by multiple times of calculation further includes:
judging the tristimulus values and the chromatic coordinates obtained by multiple times of calculation and the chromatic aberration of the average valueWhether or not it is not more than 1.5; if yes, outputting a quantitative result that the average value is the Hetian jade reflection color; if not, re-measuring the calculation.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the chromatic aberrationThe calculation formula of (2) is as follows:
wherein,,CIE1976L of two Hetian jade pieces measured for nth and nth-1 * a * b * Color space chromatic aberration;and->Chromaticity coordinates of the Hetian jade color measured for the nth piece; />And->Chromaticity coordinates of the Hetian jade color measured for the n-1 th piece.
As an alternative implementation manner, in the first aspect of the embodiment of the present invention, the light source used by the measuring instrument is a D65 standard light source.
A second aspect of the embodiment of the present invention discloses a computer readable storage medium, which is characterized in that the computer readable storage medium stores a computer program, where the computer program causes a computer to execute the quantitative measurement method for the color of the Hetian jade according to the first aspect of the embodiment of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the quantitative measurement method for the color of the Hetian jade disclosed by the embodiment of the invention, the color of the Hetian jade is quantitatively measured by using the integrating sphere spectrophotometer, and the color of the Hetian jade is quantitatively represented by using the chromaticity coordinates, so that the result representation and the color magnitude transmission of the Hetian jade color are realized, a constant value basis is provided for color classification and color grading of the Hetian jade, the color visual difference of detection personnel is avoided, and the accuracy of color identification of the Hetian jade is improved. In addition, the color cards and standard samples of the Hetian jade can be manufactured in batches according to the test results, and the color of the Hetian jade can be conveniently and rapidly matched and identified.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for quantitatively measuring color of Hetian jade according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the positions of a Hetian jade, a whiteboard and a measuring instrument according to a quantitative measurement method of color of the Hetian jade disclosed in the embodiment of the invention;
FIG. 3 is a diagram showing a quantitative measurement method of color of Hetian jade according to an embodiment of the present invention * a * b * A color space plan;
FIG. 4 is a diagram showing a quantitative measurement method of color of Hetian jade according to an embodiment of the present invention * a * b * A color space perspective;
FIG. 5 is a table of color difference levels for the quantitative measurement method of Hetian jade color disclosed in one embodiment of the invention;
FIG. 6 is a graph of reflection of a standard whiteboard of a disclosure in accordance with one embodiment of the present invention;
fig. 7 is a schematic diagram showing information transfer among a light source, an object and an observer of the quantitative measurement method of color of Hetian jade according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present invention are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Referring to fig. 1, fig. 1 is a flow chart of a quantitative measurement method of color of Hetian jade according to an embodiment of the invention. The execution main body of the method described in the embodiment of the invention is an execution main body composed of software or/and hardware, and the execution main body can receive related information in a wired or/and wireless mode and can send a certain instruction. Of course, it may also have certain processing and storage functions. The execution body may control a plurality of devices, such as a remote physical server or cloud server and related software, or may be a local host or server and related software that performs related operations on a device that is located somewhere, etc. In some scenarios, multiple storage devices may also be controlled, which may be located in the same location or in different locations than the devices.
As shown in fig. 1, the quantitative measurement method based on the color of the Hetian jade comprises the following steps:
s1: placing the surface-cleaned Hetian jade at a test port of a measuring instrument, and placing a white board on one side of the Hetian jade so that the Hetian jade is positioned between the white board and the measuring instrument, wherein the length and the width of the white board are not smaller than those of Yu Hetian jade; the instrument parameters and test conditions of the measuring instrument are configured.
In this embodiment, in order to ensure similarity between the color test result and the visual result, the transparency of a part of the nephrite is high (Y is greater than 20), so that the whiteboard in this embodiment is a polytetrafluoroethylene whiteboard (thickness is 5mm or more) as a background for testing the nephrite, and it is required to attach the nephrite as closely as possible.
Configuring instrument parameters and test conditions of a measuring instrument, comprising:
placing the sample at the instrument test hole, and enabling the sample to completely shield the instrument test hole;
the test wavelength range of the measuring instrument is set to 380-780nm, the measurement wavelength interval is set to 10nm, and a CIE1964 standard chromaticity observer is selected as the standard chromaticity observer. Standard colorimetric observers represent the average level of humans. To eliminate the perceived difference of the same color for different people, CIE defines the concept of a standard chromaticity observer. After the CIE1931 standard chromaticity system is established, years of practice prove that CIE1931 standard chromaticity observers represent the average characteristics of a 2-degree field of view, but when the observer field of view is increased to be more than 4 degrees, the CIE1931 standard chromaticity observer is smaller in the 380-460 nm wavelength interval. This is due to the involvement of cells of the eye's rod and the effects of foveal yellow pigment under large field of view conditions, where the color vision changes somewhat, and the field of view of the daily viewing object is often greater than 2 °. Thus, to accommodate the need for large field-of-view color measurement, CIE specified a set of "CIE1964 supplemental standard chromaticity observer spectral tristimulus values," abbreviated as "CIE1964 standard chromaticity observer" in 1964.
Fig. 6 is a schematic diagram of information transmission among a light source, an object and an observer, wherein the change of a chromaticity diagram caused by the change of the field of view of the observer is relatively small, but the matching precision is improved by the increase of the field of view, so that the color feeling of human eyes and the judgment of color difference can be more accurately simulated. The CIE1964 standard chromaticity observer is based on a 10 ° field of view.
The measuring instrument in the embodiment is an integrating sphere spectrophotometer, which is a physical performance testing instrument used in the field of physics, and the principle is that a standard reference lamp is used for calibration in the integrating sphere, then a measured lamp is measured, and then a computer is used for comparing and processing the relative method measurement. When the lamp under test is similar in all respects to the standard reference lamp, the error is minimized. The integrating sphere spectrophotometer has four main components: light sources, integrating spheres, gratings (spectromonochromators) and photodetectors can be categorized into two types, two-beam measurement and single-beam measurement. The dual beam integrating sphere spectrophotometer has two gratings and two detectors. The light source flashes only once during the measurement and also measures the sample and reference white board, errors caused by system variations can be overcome and the accuracy of the measured data is very high. The single beam integrating sphere spectrophotometer has only one grating and one detector. Thus, the light source blinks twice during the measurement and the sample and reference white board are measured separately. The systematic errors in the two measurements (light source intensity distribution differences, light path changes, temperature changes, circuit drift, etc.) are considered as differences between the sample and the reference white board. In this example, a two-beam integrating sphere spectrophotometer was used to measure the color of Hetian jade.
In addition, the integrating sphere spectrophotometer in this embodiment uses a D65 standard light source as the light source. The D65 standard light source is a light source which is commonly used for color matching in a standard light source box and is an artificial light source for simulating sunlight. The D65 standard light source color temperature is 6504K, and a common D65 standard light source is realized by three kinds of high-pressure xenon lamp with a filter, incandescent lamp with a filter, and fluorescent lamp with a filter.
S2: starting the measuring instrument to perform spectrum measurement on the Hetian jade to obtain a spectrum response value corresponding to the Hetian jade, wherein the calculation formula is as follows: delta 0 (λ)＝γ 0 (λ)×ρ 0 (lambda), wherein gamma 0 (lambda) is the spectral response value of the standard whiteboard; : ρ 0 (lambda) is the spectral reflectance of a standard whiteboard; delta 0 (lambda) is the standard whiteboard reflectance curve value and establishes the reflectance curve of the standard whiteboard.
S3: and calculating to obtain the corresponding spectral reflectance of the Hetian jade according to the spectral response value and a spectral reflectance formula, wherein the spectral reflectance formula is as follows:
wherein ρ (λ) is the spectral reflectance of the Hetian jade; gamma (lambda) is the spectral response value of Hetian jade; delta 0 And (lambda) is the reflection curve of a standard whiteboard. The standard white board in this example is a polytetrafluoroethylene white board, and the reflection curve values are shown in the following table:
in this embodiment, the spectral reflectance needs to be calculated by measuring different positions of the nephrite, so that the nephrite is replaced to be measured again until the acquisition of the preset number of spectral reflectances is completed. In this embodiment, the preset number is 5, and after each measurement, the measured Hetian jade is moved to measure 5 different positions. The 5 different positions should be as far as possible related to different places of the surface of the nephrite. Of course, the number of measurement times can be set to be more, and the specific number of measurement times can be set according to the shape, size and color of the Hetian jade.
S4: calculating according to the spectral reflectance and a chromaticity calculation formula to obtain corresponding chromaticity coordinates; and determining the color of the corresponding Hetian jade according to the chromaticity coordinates and the preset numerical comparison.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the chromaticity calculation formula includes a tristimulus value calculation formula and a chromaticity coordinate calculation formula, and the calculating to obtain the corresponding chromaticity coordinate according to the spectral reflectance and the chromaticity calculation formula includes:
calculating to obtain a tristimulus value corresponding to the field jade according to the spectral reflectance and the tristimulus value calculation formula;
calculating to obtain chromaticity coordinates according to tristimulus values and chromaticity coordinate calculation formulas of the Hetian jade;
the tristimulus value calculation formula is as follows:
wherein X is 10 、Y 10 、Z 10 Is the tristimulus value of the measured Hetian jade; k (k) 10 Is a normalized coefficient; ρ (λ) is the spectral reflectance of the measured Hetian jade; s (λ) is the relative spectral power distribution of the standard illuminant D65;is a CIE1964 standard chromaticity system color matching function; delta lambda is the wavelength interval, taken at 10nm.
The chromaticity coordinate calculation formula is as follows:
L * ＝116f(Y 10 /Y n )-16
a * ＝500[f(X 10 /X n )-f(Y 10 /Y n )]
b * ＝200[f(Y 10 /Y n )-f(Z 10 /Z n )]
wherein L is * 、a * 、b * Chromaticity coordinates of CIE1976 uniform color space for the sample to be measured; x is X 10 、Y 10 、Z 10 The tristimulus value of CIE1964 standard chromaticity system of the tested sample; x is X n 、Y n 、Z n Tristimulus values for CIE standard illuminant D65 under CIE1964 standard chromaticity observer, where X n ＝94.81，Y n ＝100.00，Z n ＝107.32。
CIE1976L * a * b * The color space (CIE LAB color space) was the uniform color space recommended by the international society of illumination (CIE) in 1976. The space is a three-dimensional rectangular coordinate system. Is the most widely used color measuring system at present. With brightness L * And chromaticity coordinate a * 、b * To indicate the location of the color in color space. L (L) * Representing the lightness of a color, a * Positive values indicate reddening and negative values indicate greenish; b * Positive values indicate yellowish and negative values indicate bluish.
CIE1976 L * a * b uniform color space recommended by CIE. The three-dimensional rectangular coordinate system is the most widely used color measuring system at present, and is defined by brightness L * And chromaticity coordinates, a * 、b * To indicate the location of the color in color space, with plan and perspective views as shown in fig. 3 and 4, wherein:
L * representing the lightness of the color;
a * positive values represent red and negative values represent green;
b * positive values indicate yellow, negative valuesRepresenting blue;
△E * for the integrated color difference value, deltaL * ＝L * sample-L * Standard (brightness difference)
△a * ＝a * Sample-a * Standard (Red/green difference)
△b * ＝b * Sample-b * Standard (yellow/blue difference)
Fig. 5 is a table showing the integrated color difference value level.
Executing for multiple times, and averaging the tristimulus values and chromaticity coordinates obtained by multiple times of calculation, and further comprising:
judging the tristimulus values and the chromatic coordinates obtained by multiple times of calculation and the chromatic aberration of the average valueWhether or not it is not more than 1.5; if yes, outputting a quantitative result that the average value is the Hetian jade reflection color; if not, re-measuring the calculation. According to the quantitative results, the method can be carried out in CIE1976L * a * b * The color space finds the color corresponding to the measured Hetian jade, realizes the digital value tracing of the Hetian jade color, avoids the color vision difference of detection personnel, and improves the accuracy of the color result.
Optionally, the implementation also discloses the color differenceThe calculation formula of (2) is as follows:
wherein,,CIE1976L of two Hetian jade pieces measured for nth and nth-1 * a * b * Color space chromatic aberration;and->Chromaticity coordinates of the Hetian jade color measured for the nth piece; />And->Chromaticity coordinates of the Hetian jade color measured for the n-1 th piece.
According to the quantitative measurement method for the color of the Hetian jade disclosed by the embodiment of the invention, the color of the Hetian jade is quantitatively measured by using the integrating sphere spectrophotometer, and the color of the Hetian jade is quantitatively represented by using the chromaticity coordinates, so that the result representation and the color magnitude transmission of the Hetian jade color are realized, a constant value basis is provided for color classification and color grading of the Hetian jade, the color visual difference of detection personnel is avoided, and the accuracy of color identification of the Hetian jade is improved. In addition, the color cards and standard samples of the Hetian jade can be manufactured in batches according to the test results, and the color of the Hetian jade can be conveniently and rapidly matched and identified.
Example two
An embodiment of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute some or all of the steps in the quantitative measurement method of He Tianyu color in embodiment one.
The embodiment of the invention also discloses a computer program product, wherein when the computer program product runs on a computer, the computer is caused to execute part or all of the steps in the quantitative measurement method of He Tianyu color in the first embodiment.
The embodiment of the invention also discloses an application release platform, wherein the application release platform is used for releasing a computer program product, and the computer program product enables the computer to execute part or all of the steps in the He Tianyu color quantitative measurement method in the first embodiment when running on the computer.
In various embodiments of the present invention, it should be understood that the size of the sequence numbers of the processes does not mean that the execution sequence of the processes is necessarily sequential, and the execution sequence of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present invention, or a part contributing to the prior art or all or part of the technical solution, may be embodied in the form of a software product stored in a memory, comprising several requests for a computer device (which may be a personal computer, a server or a network device, etc., in particular may be a processor in a computer device) to execute some or all of the steps of the method according to the embodiments of the present invention.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.
Those of ordinary skill in the art will appreciate that some or all of the steps of the various methods of the described embodiments may be implemented by hardware associated with a program that may be stored in a computer-readable storage medium, including Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM), or other optical disk Memory, magnetic disk Memory, tape Memory, or any other medium capable of being used to carry or store data that is readable by a computer.
The quantitative measurement method, device, electronic equipment and storage medium of Hetian jade color disclosed by the embodiment of the invention are described in detail, and specific examples are applied to the principle and implementation of the invention, and the description of the above examples is only used for helping to understand the method and core ideas of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (10)
1. The quantitative measurement method of the Hetian jade color is characterized by comprising the following steps of:
placing the surface-cleaned Hetian jade at a test port of a measuring instrument, and placing a white board on one side of the Hetian jade so that the Hetian jade is positioned between the white board and the measuring instrument, wherein the length and the width of the white board are not smaller than those of Yu Hetian jade; the instrument parameters and the test conditions of the measuring instrument are configured;
starting the measuring instrument to perform spectrum measurement on the Hetian jade so as to obtain a spectrum response value corresponding to the Hetian jade;
and calculating to obtain the corresponding spectral reflectance of the Hetian jade according to the spectral response value and a spectral reflectance formula, wherein the spectral reflectance formula is as follows:
wherein ρ (λ) is the spectral reflectance of the Hetian jade; gamma (lambda) is the spectral response value of Hetian jade; delta 0 (lambda) is the reflection curve of a standard whiteboard;
calculating according to the spectral reflectance and a chromaticity calculation formula to obtain corresponding chromaticity coordinates; and determining the color of the corresponding Hetian jade according to the chromaticity coordinates and the preset numerical comparison.
2. The method for quantitatively measuring colors of nephrite according to claim 1, comprising, after the calculation of the spectral reflectance of the corresponding nephrite:
and carrying out position replacement on the Hetian jade so as to carry out re-measurement until the acquisition of the preset number of spectral reflectances is completed.
3. The method of quantitative measurement of color of Hetian jade of claim 1, wherein the instrument parameters of the measuring instrument and the test conditions are configured to be completed, comprising:
placing the sample at the instrument test hole, and enabling the sample to completely shield the instrument test hole;
the test wavelength range of the measuring instrument is set to 380-780nm, the measurement wavelength interval is set to 10nm, and a CIE1964 standard chromaticity observer is selected as the standard chromaticity observer.
4. The quantitative measurement method of the color of Hetian jade according to claim 2, wherein the chromaticity calculation formula includes a tristimulus value calculation formula and a chromaticity coordinate calculation formula, and the calculating the corresponding chromaticity coordinates according to the spectral reflectance and the chromaticity calculation formula includes:
calculating to obtain a tristimulus value corresponding to the field jade according to the spectral reflectance and the tristimulus value calculation formula;
calculating to obtain chromaticity coordinates according to tristimulus values and chromaticity coordinate calculation formulas of the Hetian jade;
and executing for a plurality of times, and averaging the tristimulus values and the chromaticity coordinates obtained by the plurality of times of calculation.
5. The quantitative measurement method of the color of Hetian jade of claim 4, wherein the tristimulus value calculation formula is:
wherein X is 10 、Y 10 、Z 10 Is the tristimulus value of the measured Hetian jade; k (k) 10 Is a normalized coefficient; ρ (λ) is the spectral reflectance of the measured Hetian jade; s (λ) is the relative spectral power distribution of the standard illuminant D65;is a CIE1964 standard chromaticity system color matching function; delta lambda is the wavelength interval, taken at 10nm.
6. The quantitative measurement method of the color of Hetian jade of claim 1, wherein the chromaticity coordinate calculation formula is:
L * ＝116f(Y 10 /Y n )-16
a * ＝500[f(X 10 /X n )-f(Y 10 /Y n )]
b * ＝200[f(Y 10 /Y n )-f(Z 10 /Z n )]
wherein L is * 、a * 、b * The CIE1976 uniform chromaticity coordinates of the sample to be tested; x is X 10 、Y 10 、Z 10 The tristimulus value of CIE1964 standard chromaticity system of the tested sample; x is X n 、Y n 、Z n Tristimulus values for CIE standard illuminant D65 under CIE1964 standard chromaticity observer, where X n ＝94.81，Y n ＝100.00，Z n ＝107.32。
7. The method of quantitative measurement of color of Hetian jade of claim 4, wherein the performing is performed a plurality of times and averaging the tristimulus values and chromaticity coordinates calculated a plurality of times, further comprising:
judging the tristimulus values and the chromatic coordinates obtained by multiple times of calculation and the chromatic aberration of the average valueWhether or not it is not more than 1.5; if yes, outputting a quantitative result that the average value is the Hetian jade reflection color; if not, re-measuring the calculation.
8. The method for quantitatively measuring the color of Hetian jade of claim 7, wherein said color differenceThe calculation formula of (2) is as follows:
wherein,,CIE1976L of two Hetian jade pieces measured for nth and nth-1 * a * b * Color space chromatic aberration; />And->Chromaticity coordinates of the Hetian jade color measured for the nth piece; />And->Chromaticity coordinates of the Hetian jade color measured for the n-1 th piece.
9. The method of quantitative measurement of color of Hetian jade of claim, wherein the light source used by the measuring instrument is a D65 standard light source.
10. A computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the quantitative measurement method of the color of nephrite of any one of claims 1 to 9.
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| CN117147444A (en) * | 2023-08-08 | 2023-12-01 | 国家珠宝玉石首饰检验集团有限公司 | Quantitative testing method, device and storage medium for pearl halation |
| CN117686093A (en) * | 2023-12-12 | 2024-03-12 | 广州番禺职业技术学院 | Method for evaluating yellow degree of Hetian jade color |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117147444A (en) * | 2023-08-08 | 2023-12-01 | 国家珠宝玉石首饰检验集团有限公司 | Quantitative testing method, device and storage medium for pearl halation |
| CN117147444B (en) * | 2023-08-08 | 2024-09-27 | 国家珠宝玉石首饰检验集团有限公司 | Quantitative testing method, device and storage medium for pearl halation |
| CN117686093A (en) * | 2023-12-12 | 2024-03-12 | 广州番禺职业技术学院 | Method for evaluating yellow degree of Hetian jade color |
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