CN116519693A - Quantitative measurement method for Hetian jade color - Google Patents

Abstract

The invention discloses a quantitative measurement method for the color of Hetian jade. It is between the whiteboard and the measuring instrument, and the length and width of the whiteboard are not less than the length and width of Hetian jade; the instrument parameters and test conditions of the measuring instrument are configured; start the measuring instrument to measure the Hetian jade Perform spectral measurement to obtain the corresponding spectral response value of the Hetian jade; calculate the corresponding spectral reflectance of Hetian jade according to the spectral response value and spectral reflectance formula, and obtain the corresponding spectral reflectance according to the spectral reflectance and chromaticity calculation formula Chromaticity coordinates. The invention uses an integrating sphere spectrophotometer to quantitatively measure the color of the Hetian jade, and uses chromaticity coordinates to quantitatively characterize the color of the Hetian jade, thereby improving the accuracy of the color recognition of the Hetian jade.

Description

A kind of quantitative measurement method of Hetian jade color

technical field

The invention relates to the technical field of Hetian jade color recognition, in particular to a method and device for quantitatively measuring the color of Hetian jade.

Background technique

At present, there is no unified and objective standard method for the quantitative measurement of Hetian jade color at home and abroad. In the current GSB16-3061-2013 "Hetian Jade Physical Standard Sample", GB/T 38821-2020 "Hetian Jade Identification and Classification" standards, The evaluation (measurement) of the color of Hetian jade is based on the sensory evaluation method, that is, visual observation + language description, or the operation method of visual observation + color card color comparison, which has considerable dispersion and random error, and in There is a large deviation in the understanding of the value transfer, and even if the evaluators are specially trained skilled personnel, it is difficult to achieve a standardized and accurate description.

In addition, Hetian jade does not have a detailed color comparison stone (D color-N color) like diamonds, which can be compared and referenced one by one, but there are only white jade and sapphire jade in GSB 16-3061-2013 "Hetian Jade Physical Standard Sample" The lower limit samples (one for each), and representative samples for other varieties (one for each). Therefore, the number of physical standard samples is limited (there are only two sets in the country), and it is difficult to reproduce due to the limitations of Hetian jade texture and clarity.

Relying on the visual method to evaluate the color of Hetian jade has the following disadvantages:

(1) The sensitivity of the human eye to different colors is different, which affects the judgment of the color, resulting in deviations in the results;

(2) Different operators have different understandings of color and language, and different descriptions and interpretations of colors;

(3) Different observation environments have a great influence on observers, and the reproducibility of observation results is affected;

(4) It can only be described in words, there is no numerical information, it cannot be transferred by value, and it is difficult to trace the source;

(5) High labor intensity and easy to produce visual fatigue, which affects the accuracy of the results;

(6) Hetian jade has a rich variety of colors, and some colors do not have exactly the same corresponding color card colors.

This method is greatly affected by the environment, human senses and psychology, and cannot meet the needs of the testing industry and value evaluation, and cannot accurately and quantitatively measure the color of Hetian jade.

Contents of the invention

In response to the above defects, the embodiment of the present invention discloses a quantitative measurement method for the color of Hetian jade, which uses an integrating sphere spectrophotometer to quantitatively measure the color of Hetian jade, and uses chromaticity coordinates to quantitatively characterize the color of Hetian jade , which provides a basis for determining the color classification and color grading of Hetian jade, and improves the accuracy of Hetian jade color recognition.

The first aspect of the embodiment of the present invention discloses a quantitative measurement method for the color of Hetian jade, including:

Place the Hetian jade with the surface cleaned at the test port of the measuring instrument, and place a white board on one side of the Hetian jade so that the Hetian jade is between the white board and the measuring instrument, and the length and width of the white board are not less than The length and width of Hetian jade; the instrument parameters and test conditions of the measuring instrument are configured;

Start the measuring instrument to perform spectral measurement on the Hetian jade to obtain the corresponding spectral response value of the Hetian jade;

Calculate the corresponding spectral reflectance of Hetian jade according to the spectral response value and the spectral reflectance formula, and the spectral reflectance formula is:

Among them, ρ (λ) is the spectral reflectance of Hetian jade; γ (λ) is the spectral response value of Hetian jade; δ ₀ (λ) is the reflection curve of the standard whiteboard;

The corresponding chromaticity coordinates are calculated according to the spectral reflectance and the chromaticity calculation formula; the color of the corresponding Hetian jade is determined according to the chromaticity coordinates and the preset numerical comparison.

As an optional implementation, in the first aspect of the embodiment of the present invention, after the calculation obtains the corresponding spectral reflectance of Hetian jade, it includes:

Change the position of the Hetian jade for re-measurement until the acquisition of a preset number of spectral reflectances is completed.

As an optional implementation, in the first aspect of the embodiment of the present invention, the instrument parameters and test conditions of the measuring instrument are configured, including:

Place the sample at the test hole of the instrument so that the sample can completely cover the test hole of the instrument;

Set the test wavelength range of the measuring instrument to 380-780nm, set the measurement wavelength interval to 10nm, and select the CIE1964 standard chromaticity observer as the standard chromaticity observer.

As an optional implementation, in the first aspect of the embodiments of the present invention, the chromaticity calculation formula includes a tristimulus value calculation formula and a chromaticity coordinate calculation formula, and the calculation formula based on the spectral reflectance and chromaticity The formula calculates the corresponding chromaticity coordinates, including:

Calculate the corresponding tri-stimulus value of Hetian jade according to the spectral reflectance and tri-stimulus value calculation formula;

The chromaticity coordinates are calculated according to the tristimulus value and chromaticity coordinate calculation formula of Hetian jade;

Execute multiple times, and average the tristimulus values and chromaticity coordinates obtained from multiple calculations.

As an optional implementation, in the first aspect of the embodiment of the present invention, the formula for calculating the three-stimulus value is:

Among them, X ₁₀ , Y ₁₀ , Z ₁₀ are the tristimulus values of the tested Hetian jade; k ₁₀ is the normalization coefficient; ρ(λ) is the spectral reflectance of the tested Hetian jade; S(λ) is the standard illuminant D65 relative spectral power distribution; It is the color matching function of the CIE1964 standard chromaticity system; Δλ is the wavelength interval, which is 10nm.

As an optional implementation manner, in the first aspect of the embodiments of the present invention, the formula for calculating the chromaticity coordinates 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 )]

Among them, L ^* , a ^* , b ^* are the chromaticity coordinates of the CIE1976 uniform color space of the tested sample; X ₁₀ , Y ₁₀ , Z ₁₀ are the tristimulus values of the CIE1964 standard chromaticity system of the tested sample; X _n , Y _n , Z _n are tristimulus values of CIE standard illuminant D65 under CIE1964 standard chromaticity observer, wherein X _n =94.81, Y _n =100.00, Z _n =107.32.

As an optional implementation manner, in the first aspect of the embodiments of the present invention, the execution is performed multiple times, and the average value of the tristimulus values and chromaticity coordinates obtained by multiple calculations also includes:

Judging the color difference between the tristimulus values and chromaticity coordinates obtained by multiple calculations and the average value Whether it does not exceed 1.5; if yes, then output the quantitative result that the average value is the reflection color of Hetian jade; if not, re-measure and calculate.

As an optional implementation, in the first aspect of the embodiment of the present invention, the color difference The calculation formula is:

in, The CIE1976L ^* a ^* b ^* color space color difference of two Hetian jade pieces measured for the nth piece and the n-1th piece; and /> The chromaticity coordinates of the Hetian jade color measured for the nth piece; /> and /> Chromaticity coordinates of Hetian jade color measured for item n-1.

As an optional 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.

The 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, wherein the computer program causes the computer to execute the method described in the first aspect of the embodiment of the present invention. Quantitative measurement method of Hetian jade color.

Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

The quantitative measurement method for the color of Hetian jade disclosed in the embodiments of the present invention uses an integrating sphere spectrophotometer to quantitatively measure the color of Hetian jade, and uses chromaticity coordinates to quantitatively characterize the color of Hetian jade to achieve the result of the color of Hetian jade The characterization and color value transmission provide a basis for the color classification and color grading of Hetian jade, avoid the color vision difference of the inspectors, and improve the accuracy of Hetian jade color recognition. In addition, through the test results, Hetian jade color cards and standard samples can be produced in batches, which is convenient and fast for color matching and identification of Hetian jade.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is the schematic flow sheet of the quantitative measurement method of the Hetian jade color that the embodiment of the present invention discloses;

Fig. 2 is the Hetian jade of the quantitative measurement method of Hetian jade color disclosed in the first embodiment of the present invention, the position schematic diagram of white board and measuring instrument;

Fig. 3 is the L ^* a ^* b ^* color space plan view of the quantitative measurement method of the Hetian jade color disclosed in the first embodiment of the present invention;

Fig. 4 is the L ^* a ^* b ^* color space stereogram of the quantitative measurement method of Hetian jade color disclosed in the embodiment of the present invention;

Fig. 5 is the color difference value grade table of the quantitative measurement method of Hetian jade color disclosed in the first embodiment of the present invention;

Fig. 6 is a reflection curve diagram of a standard whiteboard disclosed in Embodiment 1 of the present invention;

Fig. 7 is a schematic diagram of the information transmission of the light source, object and observer of the quantitative measurement method for the color of Hetian jade disclosed in Embodiment 1 of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the terms "first", "second", "third", and "fourth" in the specification and claims of the present invention are used to distinguish different objects, rather than to describe specific order. The terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to Those steps or elements are not explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

Embodiment one

Please refer to Fig. 1, Fig. 1 is a schematic flow chart of the method for quantitatively measuring the color of Hetian jade disclosed in the embodiment of the present invention. Wherein, the execution subject of the method described in the embodiment of the present invention is an execution subject composed of software or/and hardware, and the execution subject can receive relevant information through wired or/and wireless means, and can send certain instructions. Of course, it may also have certain processing functions and storage functions. The execution subject can control multiple devices, such as a remote physical server or cloud server and related software, or a local host or server and related software that perform related operations on devices placed somewhere. In some scenarios, multiple storage devices can also be controlled, and the storage device and the device can be placed in the same place or in a different place.

As shown in Figure 1, the quantitative measurement method based on Hetian jade color comprises the following steps:

S1: Place the Hetian jade whose surface has been cleaned at the test port of the measuring instrument, and place a white board on one side of the Hetian jade so that the Hetian jade is between the white board and the measuring instrument, and the length and width of the white board are the same Not less than the length and width of Hetian jade; the instrument parameters and test conditions of the measuring instrument are configured.

The positional relationship between Hetian jade, the measuring instrument and the whiteboard is shown in Figure 2. In this embodiment, in order to ensure the similarity between the color test results and visual results, some Hetian jades have higher transparency (Y is greater than 20), so this The whiteboard in the examples is a polytetrafluoroethylene whiteboard (thickness is more than 5mm) as the background for testing Hetian jade, and it is required to adhere to the Hetian jade as much as possible.

Configure the instrument parameters and test conditions of the measuring instrument, including:

Place the sample at the test hole of the instrument so that the sample can completely cover the test hole of the instrument;

Set the test wavelength range of the measuring instrument to 380-780nm, set the measurement wavelength interval to 10nm, and select the CIE1964 standard chromaticity observer as the standard chromaticity observer. Standard colorimetric observers represent average human performance. In order to eliminate the difference in perception of the same color by different people, CIE defines the concept of standard chromaticity observer. After the establishment of the CIE1931 standard chromaticity system, it has been proved by many years of practice that the CIE1931 standard chromaticity observer represents the average feature of the 2° field of view, but when the observer’s field of view increases to more than 4°, it is too small in the wavelength range of 380nm to 460nm of. This is due to the participation of eye rod cells and the influence of fovea yellow pigment under the condition of large-area field of view, the color vision will change to a certain extent, and the field of view of daily observation objects is often greater than 2° range. Therefore, in order to meet the needs of large-field color measurement, CIE stipulated a set of "CIE1964 Supplementary Standard Chromaticity Observer Spectral Tristimulus Values" in 1964, referred to as "CIE1964 Standard Chromaticity Observer".

Figure 6 is a schematic diagram of the information transmission of the light source, object and observer. Although the change of the chromaticity diagram caused by the change of the observer's field of view is relatively small, the matching accuracy is also improved through the increase of the field of view, which is more accurate. Simulate the color perception of human eyes and judge the color difference. The CIE1964 standard chromaticity observer is based on a 10° field of view.

The measuring instrument in this embodiment is an integrating sphere spectrophotometer, which is a physical performance testing instrument used in the field of physics. The principle is to calibrate with a standard reference lamp in the integrating sphere first, and then measure the Measure the lamp, and then compare and process the relative method measurement by the computer. Errors are minimized when the lamp under test is similar in all respects to the standard reference lamp. Integrating sphere spectrophotometer has four main components: light source, integrating sphere, grating (spectromonochromator) and photodetector, and can be divided into two types: "dual-beam measurement" and "single-beam measurement". A dual-beam integrating sphere spectrophotometer has two gratings and two detectors. The light source only flickers once during the measurement, and the sample and reference whiteboard are also measured, which can overcome errors caused by system changes, and the accuracy of the measurement data is very high. A single-beam integrating sphere spectrophotometer has only one grating and one detector. Therefore, the light source flashes twice during the measurement, and the sample and reference white board are measured separately. The systematic error (difference in light source intensity distribution, light path change, temperature change, circuit drift, etc.) in the two measurements is regarded as the difference between the sample and the reference whiteboard. In this embodiment, a double-beam integrating sphere spectrophotometer is used to measure the color of Hetian jade.

In addition, the light source used by the integrating sphere spectrophotometer in this embodiment is the D65 standard light source. D65 standard light source is a commonly used light source for color matching in the standard light box, and it is an artificial light source that simulates sunlight. The color temperature of the D65 standard light source is 6504K. The common D65 standard light source is realized by three types: high-pressure xenon lamp with filter, incandescent lamp with filter and fluorescent lamp with filter.

S2: Start the measuring instrument to measure the spectrum of the Hetian jade to obtain the corresponding spectral response value of the Hetian jade, the calculation formula is: δ ₀ (λ)=γ ₀ (λ)×ρ ₀ (λ), where γ ₀ (λ) is the spectral response value of the standard whiteboard; ρ ₀ (λ) is the spectral reflectance of the standard whiteboard; δ ₀ (λ) is the reflectance curve of the standard whiteboard, and the reflectance curve of the standard whiteboard is established.

S3: Calculate and obtain the corresponding spectral reflectance of Hetian jade according to the spectral response value and the spectral reflectance formula, and the spectral reflectance formula is:

Among them, ρ(λ) is the spectral reflectance of Hetian jade; γ(λ) is the spectral response value of Hetian jade; δ ₀ (λ) is the reflectance curve of the standard whiteboard. The standard whiteboard in this embodiment is a polytetrafluoroethylene whiteboard, and its reflection curve value is shown in the following table:

In this embodiment, the spectral reflectance needs to be calculated by measuring different positions of the Hetian jade, so the position of the Hetian jade is changed for re-measurement until the acquisition of a preset number of spectral reflectances is completed. In this embodiment, the preset number is 5 times, and after each measurement, the Hetian jade to be tested is moved to measure at 5 different positions. The five different positions should relate to different places on the surface of Hetian jade as much as possible. Of course, the number of measurements can also be set to be more, and the specific number of measurements can be set according to the shape, size and color of Hetian jade.

S4: Calculate the corresponding chromaticity coordinates according to the spectral reflectance and chromaticity calculation formula; determine the color of the corresponding Hetian jade according to the chromaticity coordinates and the preset numerical comparison.

As an optional implementation, in the first aspect of the embodiments of the present invention, the chromaticity calculation formula includes a tristimulus value calculation formula and a chromaticity coordinate calculation formula, and the calculation formula based on the spectral reflectance and chromaticity The formula calculates the corresponding chromaticity coordinates, including:

Calculate the corresponding tri-stimulus value of Hetian jade according to the spectral reflectance and tri-stimulus value calculation formula;

The chromaticity coordinates are calculated according to the tristimulus value and chromaticity coordinate calculation formula of Hetian jade;

The formula for calculating the tri-stimulus value is:

Among them, X ₁₀ , Y ₁₀ , Z ₁₀ are the tristimulus values of the tested Hetian jade; k ₁₀ is the normalization coefficient; ρ(λ) is the spectral reflectance of the tested Hetian jade; S(λ) is the standard illuminant D65 relative spectral power distribution; It is the color matching function of the CIE1964 standard chromaticity system; Δλ is the wavelength interval, which is 10nm.

The formula for calculating the chromaticity coordinates 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 )]

Among them, L ^* , a ^* , b ^* are the chromaticity coordinates of the CIE1976 uniform color space of the tested sample; X ₁₀ , Y ₁₀ , Z ₁₀ are the tristimulus values of the CIE1964 standard chromaticity system of the tested sample; X _n , Y _n , Z _n are tristimulus values of CIE standard illuminant D65 under CIE1964 standard chromaticity observer, wherein X _n =94.81, Y _n =100.00, Z _n =107.32.

CIE1976L ^* a ^* b ^* color space (CIE LAB color space) is a uniform color space recommended by the International Institute of Illumination (CIE) in 1976. This space is a three-dimensional Cartesian coordinate system. It is currently the most widely used color measurement system. The position of the color in the color space is represented by lightness L ^* and chromaticity coordinates a ^* and b ^* . L ^* indicates the lightness of the color, a ^* positive value indicates reddish, negative value indicates greenish; b ^* positive value indicates yellowish, negative value indicates bluish.

CIE1976 L ^* a ^* b Uniform color space recommended by CIE. This space is a three-dimensional Cartesian coordinate system, which is the most widely used color measurement system at present. The position of the color in the color space is represented by lightness L ^* and chromaticity coordinates, a ^* and b ^* . Its plan view and three-dimensional view are shown in Figure 3 and Figure 4, where:

L ^* indicates the lightness of the color;

a ^* Positive value means red, negative value means green;

b ^* Positive value means yellow, negative value means blue;

△E ^* is the comprehensive color difference value, △L ^* ＝L ^* sample-L ^* standard (lightness difference)

△a ^* ＝a ^* sample-a ^* standard (red/green difference)

△b ^* ＝b ^* sample-b ^* standard (yellow/blue difference)

Fig. 5 is a diagram showing the level of the comprehensive color difference value.

Execute multiple times, and average the tristimulus values and chromaticity coordinates obtained from multiple calculations, including:

Judging the color difference between the tristimulus values and chromaticity coordinates obtained by multiple calculations and the average value Whether it does not exceed 1.5; if yes, then output the quantitative result that the average value is the reflection color of Hetian jade; if not, re-measure and calculate. According to the quantitative results, the corresponding color of the tested Hetian jade can be found in the CIE1976L ^* a ^* b ^* color space, realizing the digital value traceability of the Hetian jade color, avoiding the color vision difference of the inspectors, and improving the accuracy of the color results.

Optionally, this implementation also discloses the color difference The calculation formula is:

in, The CIE1976L ^* a ^* b ^* color space color difference of two Hetian jade pieces measured for the nth piece and the n-1th piece; and /> The chromaticity coordinates of the Hetian jade color measured for the nth piece; /> and /> Chromaticity coordinates of Hetian jade color measured for item n-1.

The quantitative measurement method for the color of Hetian jade disclosed in the embodiments of the present invention uses an integrating sphere spectrophotometer to quantitatively measure the color of Hetian jade, and uses chromaticity coordinates to quantitatively characterize the color of Hetian jade to achieve the result of the color of Hetian jade The characterization and color value transmission provide a basis for the color classification and color grading of Hetian jade, avoid the color vision difference of the inspectors, and improve the accuracy of Hetian jade color recognition. In addition, through the test results, Hetian jade color cards and standard samples can be produced in batches, which is convenient and fast for color matching and identification of Hetian jade.

Embodiment two

The embodiment of the present invention discloses a computer-readable storage medium, which stores a computer program, wherein the computer program causes the computer to execute some or all of the steps in the method for quantitatively measuring the color of Hetian jade in the first embodiment.

The embodiment of the present invention also discloses a computer program product, wherein, when the computer program product is run on the computer, the computer is made to execute some or all of the steps in the method for quantitatively measuring the color of Hetian jade in the first embodiment.

The embodiment of the present invention also discloses an application distribution platform, wherein the application distribution platform is used to distribute computer program products, wherein, when the computer program products are run on the computer, the computer is made to perform the quantitative measurement of the Hetian jade color in the first embodiment Some or all of the steps in the method.

In various embodiments of the present invention, it should be understood that the sequence numbers of the processes described above do not imply the necessary order of execution, and the execution order of each process should be determined by its functions and internal logic, rather than by the present invention. The implementation of the examples constitutes no limitation.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, located in one place, or distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a memory , including several requests to make a computer device (which may be a personal computer, server, or network device, etc., specifically, a processor in the computer device) execute some or all of the steps of the method described in each embodiment of the present invention.

In the embodiments provided by the present invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B based on A does not mean determining B only based on A, and B can also be determined based on A and/or other information.

Those skilled in the art can understand that some or all of the steps in the various methods of the embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium includes only Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-only Memory (PROM), Erasable Programmable Read-Only Memory (Erasable Programmable Read-Only Memory) Memory, EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically-Erasable Programmable Read-Only Memory (EEPROM), CD-ROM ( CompactDisc Read-Only Memory, CD-ROM) or other optical disk storage, magnetic disk storage, tape storage, or any other computer-readable medium that can be used to carry or store data.

The quantitative measurement method, device, electronic equipment and storage medium of the Hetian jade color disclosed in the embodiments of the present invention have been introduced in detail above. In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments It is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, The contents of this description should not be construed as limiting the present invention.

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.