A quantitative measurement method for Hetian jade color

Abstract

The invention discloses a quantitative measurement method for the color of Hetian jade, including: placing the surface-cleaned Hetian jade at the test port of a measuring instrument, and placing a polytetrafluoroethylene plate on one side of the Hetian jade so that the Hetian jade is between a white board and the measuring instrument, and the length and width of the white board are not less than the length and width of the Hetian jade; the instrument parameters and test conditions of the measuring instrument are configured; the measuring instrument is started to perform spectral measurement on the Hetian jade to obtain the spectral response value corresponding to the Hetian jade; the spectral reflectance of the corresponding Hetian jade is calculated according to the spectral response value and the spectral reflectance formula, and the corresponding chromaticity coordinates are calculated according to the spectral reflectance and the chromaticity calculation formula. The invention quantitatively measures the color of Hetian jade by using an integrating sphere spectrophotometer, and quantitatively characterizes the color of Hetian jade by using chromaticity coordinates, thereby improving the accuracy of Hetian jade color recognition.

Description

Technical Field

[0001] The invention relates to the technical field of Hetian jade color recognition, and in particular to a quantitative measurement method and device for Hetian jade color. Background Art

[0002] 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" and GB / T 38821-2020 "Hetian Jade Identification and Classification" standards, the evaluation (measurement) of Hetian jade color is based on sensory evaluation methods, that is, visual observation + language description, or visual observation + color card color comparison operation methods. There are considerable discreteness and random errors, and there are large deviations in the understanding of the transfer of quantity values. Even if the evaluators are skilled personnel who have received special training, it is difficult to make standardized and accurate descriptions.

[0003] In addition, Hetian jade does not have detailed colorimetric stones (D color-N color) like diamonds, which can be compared one by one. Instead, there are only the lower limit samples of white jade and green-white jade in GSB 16-3061-2013 "Hetian Jade Physical Standard Samples" (one each), and representative samples of other varieties (one each). Therefore, the number of physical standard samples is limited (only two sets in the country), and it is difficult to copy due to the restrictions of Hetian jade texture and clarity.

[0004] There are the following disadvantages in evaluating the color of Hetian jade by visual inspection:

[0005] (1) The human eye has different sensitivities to different colors, which affects color judgment and causes deviations in the results;

[0006] (2) Different operators have different understandings of color and language, and describe and interpret color differently;

[0007] (3) Different observation environments have a great impact on the observer, and the reproducibility of the observation results is affected;

[0008] (4) It can only be described in words, without numerical information, cannot be transferred in quantitative terms, and is difficult to trace;

[0009] (5) The labor intensity is high and it is easy to cause visual fatigue, which affects the accuracy of the results;

[0010] (6) Hetian jade has a rich variety of colors, and some colors do not have completely corresponding color card colors.

[0011] This method is greatly affected by the environment, human senses and psychology. It cannot meet the needs of the testing industry and value evaluation, and cannot accurately and quantitatively measure the color of Hetian jade. Summary of the invention

[0012] In response to the above defects, an embodiment of the present invention discloses a method for quantitatively measuring the color of Hetian jade, which quantitatively measures the color of Hetian jade by using an integrating sphere spectrophotometer, and uses chromaticity coordinates to quantitatively characterize the color of Hetian jade, thereby providing a fixed value basis for the color classification and color grading of Hetian jade and improving the accuracy of Hetian jade color identification.

[0013] The first aspect of the embodiment of the present invention discloses a quantitative measurement method for the color of Hetian jade, comprising:

[0014] The Hetian jade with cleaned surface is placed at the test port of the measuring instrument, and a white board is placed 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 the Hetian jade; the instrument parameters and test conditions of the measuring instrument are configured;

[0015] Starting the measuring instrument to perform spectrum measurement on the Hetian jade to obtain a spectrum response value corresponding to the Hetian jade;

[0016] The corresponding spectral reflectance of Hetian jade is calculated according to the spectral response value and the spectral reflectance formula, and the spectral reflectance formula is:

[0017] Among them, ρ(λ) is the spectral reflectance of Hetian jade; γ(λ) is the spectral response value of Hetian jade; δ0(λ) is the reflection curve of the standard white board;

[0018] 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.

[0019] As an optional implementation, in the first aspect of the embodiment of the present invention, after the corresponding spectral reflectance of Hetian jade is obtained by calculation, the method further comprises:

[0020] The position of the Hetian jade is changed to be remeasured until a preset number of spectral reflectance ratios are obtained.

[0021] 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:

[0022] Place the sample at the instrument test hole and make sure that the sample completely covers the instrument test hole;

[0023] The test wavelength range of the measuring instrument is set to 380-780nm, the measuring wavelength interval is set to 10nm, and the CIE1964 standard chromaticity observer is selected as the standard chromaticity observer.

[0024] As an optional implementation, 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 corresponding chromaticity coordinates are calculated according to the spectral reflectance and the chromaticity calculation formula, including:

[0025] The corresponding three stimulus values ​​of Hetian jade are calculated according to the spectral reflectance and the three stimulus value calculation formula;

[0026] The chromaticity coordinates are calculated based on the three stimulus values ​​and chromaticity coordinate calculation formula of Hetian jade;

[0027] The process is performed multiple times, and the average of the tristimulus values ​​and chromaticity coordinates calculated multiple times is taken.

[0028] As an optional implementation, in the first aspect of the embodiment of the present invention, the tristimulus value calculation formula is:

[0029]

[0030]

[0031]

[0032]

[0033] Among them, X 10 , Y 10 , Z 10 is the tristimulus value of the Hetian jade being tested; k 10 is the normalization coefficient; ρ(λ) is the spectral reflectance of the Hetian jade being tested; S(λ) is the relative spectral power distribution of the standard illuminant D65; is the color matching function of the CIE1964 standard colorimetry system; Δλ is the wavelength interval, which is 10nm.

[0034] As an optional implementation, in the first aspect of the embodiment of the present invention, the chromaticity coordinate calculation formula is:

[0035] L * =116f(Y 10 / Y n )-16

[0036] a * =500[f(X 10 / X n )-f(Y 10 / Y n )]

[0037] b * =200[f(Y 10 / Y n )-f(Z10 / Z n )]

[0038]

[0039]

[0040]

[0041] Among them, L * 、a * 、b * is the chromaticity coordinate of the CIE1976 uniform color space of the sample being tested; X 10 , Y 10 , Z 10 is the tristimulus value of the CIE1964 standard colorimetric system of the sample being tested; X n , Y n , Z n is the tristimulus value of CIE standard illuminant D65 under CIE1964 standard chromaticity observer, where X n =94.81,Y n =100.00, Z n =107.32.

[0042] As an optional implementation, in the first aspect of the embodiment of the present invention, the performing of multiple times and taking an average of the tristimulus values ​​and chromaticity coordinates calculated multiple times further includes:

[0043] Determine the color difference between the tristimulus values ​​and chromaticity coordinates calculated multiple times and the average value Whether it does not exceed 1.5; if so, output the average value as the quantitative result of the reflected color of the Hetian jade; if not, re-measure and calculate.

[0044] As an optional implementation, in the first aspect of the embodiment of the present invention, the color difference The calculation formula is:

[0045]

[0046] in, CIE1976L for two pieces of Hetian jade measured for the nth and n-1th pieces * a * b * Color space color difference; and is the chromaticity coordinate of the nth piece of Hetian jade color measured; and The chromaticity coordinates of the color of the n-1th piece of Hetian jade measured.

[0047] As an optional implementation, 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.

[0048] A second aspect of an embodiment of the present invention discloses a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, wherein the computer program enables a computer to execute the quantitative measurement method of Hetian jade color described in the first aspect of the embodiment of the present invention.

[0049] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0050] The quantitative measurement method of Hetian jade color disclosed in the embodiment of the present invention quantitatively measures the color of Hetian jade by using an integrating sphere spectrophotometer, and quantitatively characterizes the color of Hetian jade by using chromaticity coordinates, thereby achieving the result characterization of the color of Hetian jade and the color value transfer, providing a fixed value basis for the color classification and color grading of Hetian jade, avoiding the color visual differences of the inspectors, and improving the accuracy of Hetian jade color recognition. In addition, Hetian jade color cards and standard samples can be produced in batches according to the test results, so as to facilitate and quickly match and identify the color of Hetian jade. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0052] Figure 1 It is a schematic flow chart of the quantitative measurement method of Hetian jade color disclosed in the first embodiment of the present invention;

[0053] Figure 2 It is a schematic diagram of the positions of Hetian jade, a white board and a measuring instrument in the quantitative measurement method of Hetian jade color disclosed in Example 1 of the present invention;

[0054] Figure 3 is the L of the quantitative measurement method for the color of Hetian jade disclosed in Example 1 of the present invention * a * b * Color space plane;

[0055] Figure 4 is the L of the quantitative measurement method for the color of Hetian jade disclosed in Example 1 of the present invention * a * b * Color space stereogram;

[0056] Figure 5It is a color difference value grade table of the quantitative measurement method of Hetian jade color disclosed in Example 1 of the present invention;

[0057] Figure 6 is a reflection curve diagram of a standard whiteboard disclosed in Embodiment 1 of the present invention;

[0058] Figure 7 It is a schematic diagram of information transmission among a light source, an object and an observer in the method for quantitatively measuring the color of Hetian jade disclosed in the first embodiment of the present invention. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that the terms "first", "second", "third", "fourth", etc. in the specification and claims of the present invention are used to distinguish different objects rather than to describe a specific order. The terms "including" and "having" in the embodiments of the present invention and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] Embodiment 1

[0062] See also Figure 1 , Figure 1 It is a flow chart of the quantitative measurement method of Hetian jade color disclosed in the embodiment of the present invention. Among them, the execution subject of the method described in the embodiment of the present invention is an execution subject composed of software and / or hardware, and the execution subject can receive relevant information by wired or / and wireless means, and can send certain instructions. Of course, it can 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 performs related operations on a device placed somewhere. In some scenarios, multiple storage devices can also be controlled, and the storage devices can be placed in the same place or different places as the devices.

[0063] like Figure 1 As shown, the quantitative measurement method based on Hetian jade color includes the following steps:

[0064] S1: Place the Hetian jade with cleaned surface 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 the Hetian jade; the instrument parameters and test conditions of the measuring instrument are configured.

[0065] The positional relationship between Hetian jade, measuring instruments and whiteboard is as follows Figure 2 As shown, in this embodiment, in order to ensure the similarity between the color test results and the visual results, some Hetian jade has a higher transparency (Y is greater than 20), so the white board in this embodiment is a polytetrafluoroethylene white board (with a thickness of more than 5 mm) as the background for testing the Hetian jade, and it is required to be as close to the Hetian jade as possible.

[0066] Configure the instrument parameters and test conditions of the measuring instrument, including:

[0067] Place the sample at the instrument test hole and make sure that the sample completely covers the instrument test hole;

[0068] The test wavelength range of the measuring instrument is set to 380-780nm, the measurement wavelength interval is set to 10nm, and the CIE1964 standard colorimeter observer is selected as the standard colorimeter observer. The standard colorimeter observer represents the average level of human beings. In order to eliminate the difference in the perception of the same color by different people, CIE defines the concept of standard colorimeter observer. After the establishment of the CIE1931 standard colorimeter system, it has been proved through years of practice that the CIE1931 standard colorimeter observer represents the average characteristics of the 2° field of view, but when the observer's field of view increases to more than 4°, the wavelength range of 380nm to 460nm is small. This is because under the condition of large-area field of view, the participation of eye rod cells and the influence of foveal yellow pigment will cause certain changes in color vision, and the field of view of daily observation of objects is often greater than the 2° range. Therefore, in order to meet the needs of large-field color measurement, CIE stipulated a set of "CIE1964 Supplementary Standard Colorimeter Observer Spectral Tristimulus Values" in 1964, referred to as "CIE1964 Standard Colorimeter Observer".

[0069] like Figure 6 This is a schematic diagram of information transmission between light sources, objects and observers. Although the change in the chromaticity diagram caused by the change in the observer's field of view is relatively small, the matching accuracy is improved by increasing the field of view, which can more accurately simulate the color perception of the human eye and the judgment of color differences. The CIE1964 standard chromaticity observer is based on a 10° field of view.

[0070] The measuring instrument in this embodiment is an integrating sphere spectrophotometer, which is a physical property testing instrument used in the field of physics. The principle is to calibrate with a standard reference lamp in the integrating sphere, measure the lamp to be tested, and then perform relative measurement by a computer for comparison and processing. When the lamp to be tested is similar to the standard reference lamp in all aspects, the error will be reduced to a minimum. The integrating sphere spectrophotometer has four main components: a light source, an integrating sphere, a grating (spectrometric monochromator) and a photodetector, which can be divided into two types: "double beam measurement" and "single beam measurement". The double beam integrating sphere spectrophotometer has two gratings and two detectors. The light source only flashes once during the measurement, and the sample and the reference white plate are also measured, which can overcome the errors caused by system changes, and the accuracy of the measurement data is very high. The 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 the reference white plate are measured respectively. The systematic error (difference in light source intensity distribution, optical path change, temperature change, circuit drift, etc.) during the two measurements is regarded as the difference between the sample and the reference white plate. In this embodiment, a double-beam integrating sphere spectrophotometer is used to measure the color of the Hetian jade.

[0071] In addition, the light source used by the integrating sphere spectrophotometer in this embodiment is the D65 standard light source. The D65 standard light source is a light source commonly used in standard light source boxes for color matching, and is an artificial light source that simulates daylight. The color temperature of the D65 standard light source is 6504K, and the common D65 standard light source is realized by three types: a high-pressure xenon lamp with a filter, an incandescent lamp with a filter, and a fluorescent lamp with a filter.

[0072] S2: Start the measuring instrument to perform spectral measurement on the Hetian jade to obtain the spectral response value corresponding to the Hetian jade, and the calculation formula is: δ0(λ)=γ0(λ)×ρ0(λ), wherein γ0(λ) is the spectral response value of the standard white board; ρ0(λ) is the spectral reflectance of the standard white board; δ0(λ) is the reflection curve value of the standard white board, and the reflection curve of the standard white board is established.

[0073] S3: Calculate the corresponding spectral reflectance of the Hetian jade according to the spectral response value and the spectral reflectance formula, and the spectral reflectance formula is:

[0074] Wherein, ρ(λ) is the spectral reflectance of Hetian jade; γ(λ) is the spectral response value of Hetian jade; δ0(λ) is the reflection curve of the standard white board. The standard white board in this embodiment is a polytetrafluoroethylene white board, and its reflection curve value is shown in the following table:

[0075]

[0076]

[0077] 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 to be re-measured until the acquisition of the preset number of spectral reflectances is completed. In this embodiment, the preset number is 5 times. After each measurement, the measured Hetian jade is moved and its 5 different positions are measured. The 5 different positions should involve different places on the surface of the Hetian jade as much as possible. Of course, the number of measurements can also be set to more, and the specific number of measurements can be set according to the shape, size and color of the Hetian jade.

[0078] S4: Calculate the corresponding chromaticity coordinates according to the spectral reflectance and the chromaticity calculation formula; determine the color of the corresponding Hetian jade according to the chromaticity coordinates and the preset numerical comparison.

[0079] As an optional implementation, 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 corresponding chromaticity coordinates are calculated according to the spectral reflectance and the chromaticity calculation formula, including:

[0080] The corresponding three stimulus values ​​of Hetian jade are calculated according to the spectral reflectance and the three stimulus value calculation formula;

[0081] The chromaticity coordinates are calculated based on the three stimulus values ​​and chromaticity coordinate calculation formula of Hetian jade;

[0082] The three stimulus value calculation formula is:

[0083]

[0084]

[0085]

[0086]

[0087] Among them, X 10 , Y 10 , Z 10 is the tristimulus value of the Hetian jade being tested; k 10 is the normalization coefficient; ρ(λ) is the spectral reflectance of the Hetian jade being tested; S(λ) is the relative spectral power distribution of the standard illuminant D65; is the color matching function of the CIE1964 standard colorimetry system; Δλ is the wavelength interval, which is 10nm.

[0088] The chromaticity coordinate calculation formula is:

[0089] L * =116f(Y 10 / Y n )-16

[0090] a * =500[f(X 10 / X n )-f(Y 10 / Y n )]

[0091] b * =200[f(Y 10 / Y n )-f(Z 10 / Z n )]

[0092]

[0093]

[0094]

[0095] Among them, L * 、a * , b * is the chromaticity coordinate of the CIE1976 uniform color space of the sample being tested; X 10 , Y 10 , Z 10 is the tristimulus value of the CIE1964 standard colorimetric system of the sample being tested; X n , Y n , Z n is the tristimulus value of CIE standard illuminant D65 under CIE1964 standard chromaticity observer, where X n =94.81,Y n =100.00, Z n =107.32.

[0096] CIE1976L * a * b * The color space (CIE LAB color space) is a uniform color space recommended by the International Commission on Illumination (CIE) in 1976. This space is a three-dimensional rectangular coordinate system. It is currently the most widely used color measurement system. * and chromaticity coordinates a * , b * To indicate the position of the color in the color space. * Indicates the brightness of the color, a * Positive values ​​indicate reddishness, negative values ​​indicate greenishness; b * Positive values ​​indicate a yellowish tint, negative values ​​indicate a bluish tint.

[0097] CIE1976 L * a *b Uniform color space recommended by CIE. This space is a three-dimensional rectangular coordinate system and is currently the most widely used color measurement system. * and chromaticity coordinates, a * 、b * To represent the position of color in color space, its plane and stereograms are as follows Figure 3 and Figure 4 As shown, where:

[0098] L * Indicates the brightness of a color;

[0099] a * Positive values ​​represent red, negative values ​​represent green;

[0100] b * Positive values ​​represent yellow, negative values ​​represent blue;

[0101] △E * is the comprehensive color difference value, △L * =L * Sample-L * Standard (brightness difference)

[0102] △a * =a * sample-a * Standard (red / green difference)

[0103] △b * =b * Sample-b * Standard (yellow / blue difference)

[0104] Figure 5 It is a diagram showing the comprehensive color difference value level.

[0105] Execute multiple times and average the tristimulus values ​​and chromaticity coordinates obtained from multiple calculations, and also include:

[0106] Determine the color difference between the tristimulus values ​​and chromaticity coordinates calculated multiple times and the average value Is it less than 1.5? If so, the average value is output as the quantitative result of the Hetian jade reflection color; if not, re-measure and calculate. According to the quantitative results, the CIE1976L * a * b * The color space finds the color corresponding to the tested Hetian jade, realizes the digital value traceability of the Hetian jade color, avoids the color vision differences of the inspectors, and improves the accuracy of the color results.

[0107] Optionally, this embodiment also discloses the color difference The calculation formula is:

[0108]

[0109] in, CIE1976L for two pieces of Hetian jade measured for the nth and n-1th pieces * a * b * Color space color difference; and is the chromaticity coordinate of the nth piece of Hetian jade color measured; and The chromaticity coordinates of the color of the n-1th piece of Hetian jade measured.

[0110] The quantitative measurement method of Hetian jade color disclosed in the embodiment of the present invention quantitatively measures the color of Hetian jade by using an integrating sphere spectrophotometer, and quantitatively characterizes the color of Hetian jade by using chromaticity coordinates, thereby achieving the result characterization of the color of Hetian jade and the color value transfer, providing a fixed value basis for the color classification and color grading of Hetian jade, avoiding the color visual differences of the inspectors, and improving the accuracy of Hetian jade color recognition. In addition, Hetian jade color cards and standard samples can be produced in batches according to the test results, so as to facilitate and quickly match and identify the color of Hetian jade.

[0111] Embodiment 2

[0112] An embodiment of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program enables a computer to execute part or all of the steps in the quantitative measurement method of Hetian jade color in embodiment one.

[0113] The embodiment of the present invention also discloses a computer program product, wherein when the computer program product is run on a computer, the computer is enabled to execute part or all of the steps in the quantitative measurement method of Hetian jade color in embodiment one.

[0114] An embodiment of the present invention also discloses an application publishing platform, wherein the application publishing platform is used to publish a computer program product, wherein when the computer program product runs on a computer, the computer executes part or all of the steps in the quantitative measurement method of Hetian jade color in embodiment one.

[0115] In various embodiments of the present invention, it should be understood that the size of the serial numbers of the processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0116] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0117] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0118] If the integrated unit is implemented in the form of a software functional 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, in essence, 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, which is stored in a memory and includes several requests for a computer device (which can be a personal computer, a server or a network device, etc., specifically a processor in a computer device) to perform some or all of the steps of the method described in each embodiment of the present invention.

[0119] 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 according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0120] A person of ordinary skill 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 a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0121] The quantitative measurement method, device, electronic device and storage medium for the color of Hetian jade disclosed in the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A quantitative measurement method for Hetian jade color, characterized in that: include: The Hetian jade with cleaned surface is placed at the test port of the measuring instrument, and a white board is placed 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 the Hetian jade; the instrument parameters and test conditions of the measuring instrument are configured; the light source used by the measuring instrument is the D65 standard light source, the light source only flashes once during the measurement, and the sample and the reference white are also measured; the instrument parameters and test conditions of the measuring instrument are configured, including: Place the sample at the instrument test hole and make sure that the sample completely covers 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 the CIE1964 standard chromaticity observer is selected as the standard chromaticity observer; the measuring instrument is started to perform spectral measurement on the Hetian jade to obtain the spectral response value corresponding to the Hetian jade; the spectral reflectance of the corresponding Hetian jade is calculated according to the spectral response value and the spectral reflectance formula, and the spectral reflectance formula is: ， Wherein, ρ(λ) is the spectral reflectance of Hetian jade; γ(λ) is the spectral response value of Hetian jade; δ0 (λ) is the reflection curve of the standard white board; Repositioning the Hetian jade to re-measure until a preset number of spectral reflectance ratios are obtained; The corresponding chromaticity coordinates are calculated according to the spectral reflectance and the chromaticity calculation formula, wherein the chromaticity calculation formula includes a tristimulus calculation formula and a chromaticity coordinate calculation formula, and the corresponding chromaticity coordinates are calculated according to the spectral reflectance and the chromaticity calculation formula, including: The corresponding three-stimulus values ​​of Hetian jade are calculated according to the spectral reflectance and the three-stimulus calculation formula; The chromaticity coordinates are calculated based on the three stimulus values ​​and chromaticity coordinate calculation formula of Hetian jade; Execute multiple times and take the average of the tristimulus values ​​and chromaticity coordinates calculated multiple times; Among them, it also includes: Determine the color difference between the tristimulus values ​​and chromaticity coordinates calculated multiple times and the average value Is it no more than 1.5? If so, output the average value as the quantitative result of the Hetian jade reflection color; if not, re-measure and calculate; the color difference The calculation formula is: ， in, CIE1976L*a of two pieces of Hetian jade measured for the nth and n-1th pieces * b * Color space color difference; , and is the chromaticity coordinate of the nth piece of Hetian jade color measured; , and The chromaticity coordinates of the color of the n-1th piece of Hetian jade measured; Use chromaticity coordinates to quantitatively characterize the color of Hetian jade; The three-stimulus calculation formula is: ， Among them, X 10 , Y 10 , Z 10 is the tristimulus value of the Hetian jade being tested; k 10 is the normalization coefficient; ρ(λ) is the spectral reflectance of the Hetian jade being tested; S(λ) is the relative spectral power distribution of the standard illuminant D65; is the color matching function of the CIE1964 standard colorimetry system; Δλ is the wavelength interval, which is 10nm; The chromaticity coordinate calculation formula is: ， ， Among them, L * 、a * 、b * is the CIE1976 uniform chromaticity coordinate of the sample being tested; X 10 , Y 10 , Z 10 is the tristimulus value of the CIE1964 standard colorimetric system of the sample being tested; X n , Y n , Z n is the tristimulus value of CIE standard illuminant D65 under CIE1964 standard chromaticity observer, where X n =94.81,Y n =100.00, Z n =107.

32.

2. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, wherein the computer program enables a computer to execute the quantitative measurement method for the color of Hetian jade as described in claim 1.

Images