CN117147444B - Quantitative testing method, device and storage medium for pearl halation - Google Patents
Quantitative testing method, device and storage medium for pearl halation Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 238000004737 colorimetric analysis Methods 0.000 claims abstract description 76
- 238000000034 method Methods 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 38
- 238000012113 quantitative test Methods 0.000 claims abstract description 12
- 206010025482 malaise Diseases 0.000 claims abstract description 6
- 239000011049 pearl Substances 0.000 claims description 138
- 239000003086 colorant Substances 0.000 claims description 11
- 238000003384 imaging method Methods 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 229910052736 halogen Inorganic materials 0.000 claims description 3
- 150000002367 halogens Chemical class 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000005286 illumination Methods 0.000 claims 12
- 238000011156 evaluation Methods 0.000 abstract description 15
- 230000001953 sensory effect Effects 0.000 abstract description 5
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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Abstract
The embodiment of the application discloses a quantitative test method and device for pearl halation and a storage medium, wherein the quantitative test method for pearl halation comprises the following steps: calibrating the chromaticity measurement module in a simulated daylight environment; under the simulated sunlight environment, obtaining chromaticity values of test points corresponding to different halation positions of the pearl to be tested by utilizing the chromaticity measurement module; obtaining colorimetry parameter data of different test points of the pearl based on the colorimetry values of the different test points, and further calculating brightness, hue angle, chroma or saturation of each test point; and comparing various colorimetry parameters of the pearl with those of a standard sample to evaluate and grade the color sickness of the pearl. The method solves the problems that evaluation of pearl halation still depends on human eye sensory evaluation and a quantitative measuring method is lacking in the prior art.
Description
Technical Field
The application relates to the technical field of jewelry color evaluation, in particular to a quantitative test method and device for pearl halation and a storage medium.
Background
The iridescence is a drifting iridescence formed by the surface or subsurface multilayer structure of the pearl, and is a comprehensive reflection of various optical phenomena such as refraction, interference, diffraction, transmission, reflection and the like of incident light by the internal structure of the pearl. Color is an important factor affecting the value of the pearl, and whether or not there is a rich halation has an important effect on the value of the pearl.
Evaluation of pearl color appearance has been a difficulty in the field of jewelry detection. At present, in the pearl industry at home and abroad, the evaluation of pearl halation still depends on human eye sensory evaluation, and the pearl halation evaluation index is still blank. Therefore, a quantitative measuring and evaluating method for pearl halation is urgently needed in the industry.
Disclosure of Invention
The embodiment of the application aims to provide a quantitative test method, a quantitative test device and a storage medium for pearl halation, which are used for solving the problem that the evaluation of pearl halation still depends on human eye sensory evaluation and lacks a quantitative measurement method in the prior art.
In order to achieve the above purpose, the embodiment of the application provides a quantitative test method for pearl halation, which comprises the following steps: calibrating the chromaticity measurement module in a simulated daylight environment;
Under the simulated sunlight environment, obtaining chromaticity values of test points corresponding to different halation positions of the pearl to be tested by utilizing the chromaticity measurement module;
Obtaining colorimetry parameter data of different test points of the pearl based on the colorimetry values of the different test points, and further calculating brightness, hue angle, chroma or saturation of each test point;
and comparing various colorimetry parameters of the pearl with those of a standard sample to evaluate and grade the color sickness of the pearl.
Optionally, the calibrating the colorimetric measurement module in the simulated daylight environment includes:
using a light source to illuminate a calibration plate to simulate a daylight environment, obtaining a chromaticity value of the standard plate through metering calibration;
and acquiring colorimetry data of the standard plate in a simulated sunlight environment through the colorimetry module, and calibrating the colorimetry module according to the colorimetry value of the standard plate.
Optionally, the obtaining, by using the colorimetric measurement module, the colorimetric values of the test points corresponding to different halo positions of the pearl to be tested in the simulated sunlight environment includes:
When the chromaticity measurement module is used for obtaining the chromaticity value of the pearl, the standard plate is placed beside the pearl, so that the light rays in the simulated sunlight environment are reflected to the surface of the pearl through the standard plate.
Optionally, based on the chromaticity values of the test points, obtaining chromaticity parameter data of the test points of different pearls, and further calculating brightness, hue angle, chroma or saturation of each test point, including:
The colorimetry parameter data comprises an approximately uniform three-dimensional color space L *、a*、b* formed by rectangular coordinate drawing, and is defined as:
wherein X, Y and Z represent chromaticity values of test points, and X n,Yn,Zn represents specific white achromatic stimulus;
The calculation method of the brightness is L *＝116(Y/Yn)1/3-16,Y/Yn >0.008856;
a. The calculating method of b chroma is that
A. the calculating method of the b hue angle is as follows: h ab＝arctan(b*/a*).
Optionally, after obtaining the colorimetry parameter data of the test points different from the pearl, the method further includes:
and comparing the color represented by the colorimetry parameter data of the test point with the color observed by human eyes at the position corresponding to the pearl so as to verify the effectiveness of the test.
In order to achieve the above object, a quantitative test device for pearl halation comprises: the system comprises a chromaticity measurement module, a calibration plate, a light source and a main control computer; wherein the method comprises the steps of
The light source is used for simulating a sunlight environment and illuminating the pearl to be tested or the calibration plate from a specific angle or a plurality of angles;
The calibration board is used for calibrating the colorimetric measurement module in a simulated daylight environment;
The colorimetry module is used for acquiring colorimetry values of test points corresponding to different color sickness positions of the pearl in the simulated sunlight environment;
The main control computer is used for obtaining colorimetry parameter data of different test points of the pearl based on the colorimetry values of the different test points, further calculating brightness, hue angle, chroma or saturation of each test point, comparing the colorimetry parameters of the pearl with those of a standard sample, and evaluating and grading the halation of the pearl.
Optionally, the method further comprises:
A holder for holding the pearl to be tested, the holder having a rotation function to enable the light source to illuminate the pearl from a specific angle or angles;
During testing, the calibration plate is placed beside the pearl or on the bracket.
Optionally, the light source comprises a simulated daylight light source, an LED light source, a supercontinuum white light source, a halogen lamp, a daylight lamp, or an integrating sphere light source;
The colorimetry module comprises an imaging colorimeter, a color brightness meter, an imaging colorimeter or an optical fiber spectrometer with a collimator;
the calibration plate includes a standard whiteboard, a diffuse reflecting plate, or a flat plate having diffuse reflecting characteristics.
To achieve the above object, the present application also provides a computer storage medium having stored thereon a computer program which, when executed by a machine, implements the steps of the method as described above.
The embodiment of the application has the following advantages:
The embodiment of the application provides a quantitative test method for pearl halation, which comprises the following steps: calibrating the chromaticity measurement module in a simulated daylight environment; under the simulated sunlight environment, obtaining chromaticity values of test points corresponding to different halation positions of the pearl to be tested by utilizing the chromaticity measurement module; obtaining colorimetry parameter data of different test points of the pearl based on the colorimetry values of the different test points, and further calculating brightness, hue angle, chroma or saturation of each test point; and comparing various colorimetry parameters of the pearl with those of a standard sample to evaluate and grade the color sickness of the pearl.
By the method, the colorimetry module and the light source are utilized to build the testing device, the effect of observing the pearl by human eyes in the sunlight environment is simulated, and colorimetry parameters of the pearl surface halation are collected, so that the optical characteristics of the pearl halation at different test points are scientifically expressed, the colorimetry parameter measurement of multiple small areas of the pearl can be realized, and quantitative measurement and evaluation of the pearl halation are realized. The method solves the problems that evaluation of pearl halation still depends on human eye sensory evaluation and a quantitative measuring method is lacking in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.
FIG. 1 is a black pearl halation image;
FIG. 2 is a schematic diagram of obtaining color trajectories of test points in CIE chromaticity coordinates based on colorimetry parameter data of black pearl color-sickness test points;
FIG. 3 is a flowchart of a method for quantitatively testing pearl halation according to an embodiment of the present application;
fig. 4 is a schematic block diagram of a quantitative test device for pearl halation provided by the embodiment of the application.
Detailed Description
Other advantages and advantages of the present application will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
Taking the black pearl with rich halation in fig. 1 as an example, due to different angles of light rays, optical effects such as refraction, interference, diffraction, transmission, reflection and the like occur between aragonite crystal layers in the pearl, so that a brown-yellow-green halation change is shown from the central area to the edge area of the black pearl (as in fig. 1). Under the simulated daylight light source, colorimetry data (L *、a*、b*, X, Y, Z, x, y values and the like) from the center to the edge at different positions are obtained through an imaging colorimeter, color tracks corresponding to colorimetry data of each test point are shown as black crosses in fig. 2, and then the representation of the halation characteristic can be realized according to the length of the color tracks and the change of the hue angle.
Based on the foregoing, an embodiment of the present application provides a method for quantitatively testing pearl bloom, and referring to fig. 3, fig. 3 is a flowchart of a method for quantitatively testing pearl bloom provided in an embodiment of the present application, it should be understood that the method may further include additional blocks not shown and/or may omit the blocks shown, and the scope of the present application is not limited in this respect.
At step 101, the colorimetric measurement module is calibrated in a simulated daylight environment.
In some embodiments, a calibration plate is illuminated with a light source to simulate a daylight environment, chromaticity values of the standard plate being obtained by metrology calibration;
and acquiring colorimetry data of the standard plate in a simulated sunlight environment through the colorimetry module, and calibrating the colorimetry module according to the colorimetry value of the standard plate.
At step 102, under the simulated daylight environment, using the colorimetric measurement module to obtain colorimetric values of test points corresponding to different halation positions of the pearl to be tested.
In some embodiments, the standard plate is removed, a bracket is placed at the standard plate acquisition point, and the pearl to be tested is placed on the bracket for obtaining the chromaticity value of the test point in a simulated daylight environment.
In some embodiments, when the colorimetric values of the pearls are obtained by the colorimetric measurement module, the standard plate is placed beside the pearls, so that the light rays in the simulated sunlight environment are reflected to the surface of the pearls through the standard plate.
At step 103, based on the chromaticity values of the different test points, the colorimetry parameter data of the different test points of the pearl are obtained, and brightness, hue angle, chroma or saturation of each test point is calculated. Therefore, scientific quantitative expression of the pearl halation color characteristics is realized, and the color locus of the test point in CIE chromaticity coordinates can be further obtained.
In some embodiments, the colorimetry parameter data comprises L *、a*、b*, X, Y, Z, x, y, etc., and L *、a*、b* is an approximately uniform three-dimensional color space plotted in rectangular coordinates defined as:
Wherein X, Y and Z represent chromaticity values of the test points, and X n,Yn,Zn represents specific white achromatic stimulus.
Hue angle and chroma are calculated from the value of a *、b*, representing the hue and saturation of a color.
The calculation method of the brightness is L *＝116(Y/Yn)1/3-16,Y/Yn >0.008856;
a. The calculating method of b chroma is that
A. the calculating method of the b hue angle is as follows: h ab＝arctan(b*/a*).
In the above embodiments, different test points refer to measurements at different locations on the surface of the pearl sample. As shown in FIG. 1, due to different incident angles of light, different color halos are formed on the surface of the pearl from the center to the edge, and the operation method of the selected position is to click a measuring point by using a mouse, so that the software can realize measurement. Typically the path of the mouse click is the path that selects the most obvious change in color of the pearl surface.
In addition, the scientific quantitative expression refers to the fact that the color of the pearl is mainly described through sense words in the field of jewelry detection at present, and the method can use colorimetry parameter measurement data to scientifically and quantitatively express the characteristics of brightness, hue angle, chroma and the like of the pearl.
In some embodiments, after obtaining the colorimetry parameter data of the test points of the pearl, the method further comprises: and comparing the color represented by the colorimetry parameter data of the test point with the color observed by human eyes at the position corresponding to the pearl so as to verify the effectiveness of the test.
At step 104, the colorimetry parameters of the pearl are compared to standard samples to evaluate and rank the pearl's halation.
Specifically, for example:
Color contrast: the pearls were compared in color with the standard. Professional color reference charts or colorimeters are used to measure and compare their colors. Different scores can be given according to the size of the color difference, and if the colors are very close, the score is high, and if the difference is large, the score is low.
Tone contrast: the hue angles of the pearls and standard samples were compared. Hue angle refers to a fundamental property of a color, e.g. colors red, blue, green, etc. correspond to different hue angles. Depending on whether the hue angle of the pearl is consistent with that of the standard sample, a corresponding score may be given.
Contrast of chroma: the chroma of the pearls was compared to the standard. The chroma measures the vividness of a color, with higher values representing brighter colors. The difference in chroma between the two was observed using a colorimeter or naked eyes and a corresponding score was given.
Fig. 4 is a block diagram of a quantitative test device for pearl 205 halation provided by an embodiment of the present application. The device comprises: the system comprises a chromaticity measurement module 201, a calibration plate 202, a light source 203 and a main control computer 204; wherein the method comprises the steps of
The light source 203 is used to simulate a daylight environment and illuminate the pearl 205 to be tested or the calibration plate 202 from a specific angle or angles;
The calibration board 202 is used for calibrating the colorimetric measurement module 201 in a simulated daylight environment;
the colorimetric measurement module 201 is configured to obtain colorimetric values of test points corresponding to different halo positions of the pearl 205 in the simulated daylight environment;
The main control computer 204 is configured to obtain colorimetry parameter data of different test points of the pearl 205 based on the colorimetry values of the different test points, and further calculate brightness, hue angle, chroma or saturation of each test point, so as to compare each colorimetry parameter of the pearl 205 with each colorimetry parameter of a standard sample, and evaluate and grade the halation of the pearl 205.
In some embodiments, further comprising:
a holder 206 for holding the pearl 205 to be tested, the holder 206 having a rotation function to enable the light source 203 to illuminate the pearl 205 from a specific angle or angles;
the calibration plate 202 is placed beside the pearl 205 or on the stand 206 during testing.
The standard whiteboard is placed next to the pearl 205 during testing to allow light to reflect through the standard whiteboard to the surface of the pearl 205, resulting in a better halation effect.
In some embodiments, the light source 203 comprises an analog daylight light source, an LED light source, a super-continuum white light source, a halogen lamp, a daylight lamp, or an integrating sphere light source.
In some embodiments, the colorimetry module 201 comprises an imaging colorimeter, a color brightness meter, an imaging colorimeter, or a fiber optic spectrometer with a collimator;
the color brightness meter or the optical fiber spectrometer with the collimator needs to adjust the mechanical position when selecting the measuring area, and the imaging colorimeter can randomly select the measuring position by using a mouse through software.
In some embodiments, the calibration plate 202 comprises a standard whiteboard, a diffuse reflecting plate, or a flat plate with diffuse reflecting characteristics;
Wherein when using a diffuse reflecting plate, or a plate having diffuse reflecting characteristics, it is necessary to obtain their chromaticity values which are subjected to measurement calibration.
Reference is made to the foregoing method embodiments for specific implementation methods, and details are not repeated here.
By the method and the device, the colorimetry measuring module and the light source are mainly utilized to build the testing device, the effect of observing the pearl by human eyes in the sunlight environment is simulated, and colorimetry parameters of the pearl surface halation are collected, so that optical characteristics such as brightness, hue angle, chroma and the like of the pearl halation at different test points are scientifically expressed, the colorimetry parameters of a plurality of small areas of the pearl can be measured by the measuring device, and quantitative measurement and evaluation of the pearl halation are realized;
and by comparing the colors observed by human eyes with the actually collected colorimetry parameters and the RGB display effect, the effectiveness of the quantitative measurement and evaluation method for the pearl halation to the scientific expression of the pearl halation is verified, and the visual visibility of the halation effect is realized.
Specifically: the beneficial effects of the scheme of the application include:
(1) The method for scientifically measuring and expressing the optical characteristics of the pearl halation is provided for the first time, and errors of human eye sensory evaluation are avoided.
(2) For the first time, a device and a measurement flow for scientifically expressing pearl halation by using an imaging colorimeter, a standard whiteboard and a simulated sunlight source are proposed.
(3) The measurement result can realize magnitude tracing through a standard white board and trace to a chromaticity measurement standard, thereby ensuring accurate and reliable magnitude.
(4) The measuring device can realize the measurement of colorimetry parameters of a plurality of small areas of the pearl, thereby realizing quantitative evaluation of the halation.
The present application may be a method, apparatus, system, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for performing various aspects of the present application.
The computer readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media, as used herein, are not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., optical pulses through fiber optic cables), or electrical signals transmitted through wires.
The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.
Computer program instructions for carrying out operations of the present application may be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as SMALLTALK, C ++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions may be executed entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present application are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information for computer readable program instructions, which can execute the computer readable program instructions.
Various aspects of the present application are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer readable program instructions may be provided to a processing unit of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable medium having the instructions stored therein includes an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Note that all features disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic set of equivalent or similar features. Where used, further, preferably, still further and preferably, the brief description of the other embodiment is provided on the basis of the foregoing embodiment, and further, preferably, further or more preferably, the combination of the contents of the rear band with the foregoing embodiment is provided as a complete construct of the other embodiment. A further embodiment is composed of several further, preferably, still further or preferably arrangements of the strips after the same embodiment, which may be combined arbitrarily.
While the application has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the application and are intended to be within the scope of the application as claimed.
Claims (4)
1. The quantitative test method for pearl halation is characterized by comprising the following steps:
Calibrating the chromaticity measurement module in a simulated daylight environment;
Under the simulated sunlight environment, obtaining chromaticity values of test points corresponding to different halation positions of the pearl to be tested by utilizing the chromaticity measurement module;
Obtaining colorimetry parameter data of different test points of the pearl based on the colorimetry values of the different test points, and further calculating brightness, hue angle, chroma or saturation of each test point;
Comparing various colorimetry parameters of the pearl with those of a standard sample to evaluate and grade the halation of the pearl;
The calibrating the colorimetric measurement module in the simulated daylight environment comprises the following steps:
using a light source illumination calibration plate to simulate a daylight environment, obtaining a chromaticity value of the light source illumination calibration plate through metering calibration;
Obtaining colorimetry data of the light source illumination calibration plate in a simulated daylight environment through the colorimetry module, and calibrating the colorimetry module according to the colorimetry value of the light source illumination calibration plate;
and under the simulated sunlight environment, acquiring the chromaticity values of the test points corresponding to different halation positions of the pearl to be tested by utilizing the chromaticity measurement module, wherein the method comprises the following steps:
When the chromaticity measurement module is used for obtaining the chromaticity value of the pearl, the light source illumination calibration plate is placed beside the pearl, so that the light rays in the simulated sunlight environment are reflected to the surface of the pearl through the light source illumination calibration plate;
The obtaining the colorimetry parameter data of the test points of different pearls based on the colorimetry values of the test points of different pearls, and further calculating the brightness, the hue angle, the chroma or the saturation of each test point comprises the following steps:
The colorimetry parameter data comprises an approximately uniform three-dimensional color space L *、a*、b* formed by rectangular coordinate drawing, and is defined as:
wherein X, Y and Z represent chromaticity values of test points, and X n,Yn,Zn represents specific white achromatic stimulus;
The calculation method of the brightness is L *＝116(Y/Yn)1/3-16,Y/Yn > 0.008856;
a. The calculating method of b chroma is that
A. The calculating method of the b hue angle is as follows: h ab＝arctan(b*/a*);
Comparing the colorimetry parameters of the pearl with those of a standard sample to evaluate and rank the pearl's halation, comprising:
Comparing the colors of the pearls with that of the standard sample, and giving different scores according to the difference of the colors;
Comparing the hue angles of the pearl and the standard sample, and giving corresponding scores according to whether the hue angles of the pearl and the standard sample are consistent; different colors correspond to different hue angles;
comparing the chroma of the pearl with that of the standard sample, wherein the chroma measures the vividness of the color; corresponding scores were given based on the difference in chroma between the pearl and the standard sample.
2. The method of quantifying pearl bloom in accordance with claim 1, further comprising, after said obtaining colorimetry parameter data for said test points for different pearls:
and comparing the color represented by the colorimetry parameter data of the test point with the color observed by human eyes at the position corresponding to the pearl so as to verify the effectiveness of the test.
3. A quantitative test device for pearl halation, comprising: the system comprises a chromaticity measurement module, a calibration plate, a light source and a main control computer; wherein the method comprises the steps of
The light source is used for simulating a sunlight environment and illuminating the pearl to be tested or the calibration plate from a plurality of angles;
The calibration board is used for calibrating the colorimetric measurement module in a simulated daylight environment;
The colorimetry module is used for acquiring colorimetry values of test points corresponding to different color sickness positions of the pearl in the simulated sunlight environment;
the main control computer is used for obtaining colorimetry parameter data of different test points of the pearl based on the colorimetry values of the different test points, further calculating brightness, hue angle, chroma or saturation of each test point, comparing each colorimetry parameter of the pearl with each colorimetry parameter of a standard sample, and evaluating and grading the halation of the pearl;
The calibrating the colorimetric measurement module in the simulated daylight environment comprises the following steps:
using a light source illumination calibration plate to simulate a daylight environment, obtaining a chromaticity value of the light source illumination calibration plate through metering calibration;
Obtaining colorimetry data of the light source illumination calibration plate in a simulated daylight environment through the colorimetry module, and calibrating the colorimetry module according to the colorimetry value of the light source illumination calibration plate;
and under the simulated sunlight environment, acquiring the chromaticity values of the test points corresponding to different halation positions of the pearl to be tested by utilizing the chromaticity measurement module, wherein the method comprises the following steps:
When the chromaticity measurement module is used for obtaining the chromaticity value of the pearl, the light source illumination calibration plate is placed beside the pearl, so that the light rays in the simulated sunlight environment are reflected to the surface of the pearl through the light source illumination calibration plate;
The obtaining the colorimetry parameter data of the test points of different pearls based on the colorimetry values of the test points of different pearls, and further calculating the brightness, the hue angle, the chroma or the saturation of each test point comprises the following steps:
The colorimetry parameter data comprises an approximately uniform three-dimensional color space L *、a*、b* formed by rectangular coordinate drawing, and is defined as:
wherein X, Y and Z represent chromaticity values of test points, and X n,Yn,Zn represents specific white achromatic stimulus;
The calculation method of the brightness is L *＝116(Y/Yn)1/3-16,Y/Yn > 0.008856;
a. The calculating method of b chroma is that
A. The calculating method of the b hue angle is as follows: h ab＝arctan(b*/a*);
Comparing the colorimetry parameters of the pearl with those of a standard sample to evaluate and rank the pearl's halation, comprising:
Comparing the colors of the pearls with that of the standard sample, and giving different scores according to the difference of the colors;
Comparing the hue angles of the pearl and the standard sample, and giving corresponding scores according to whether the hue angles of the pearl and the standard sample are consistent; different colors correspond to different hue angles;
Comparing the chroma of the pearl with that of the standard sample, wherein the chroma measures the vividness of the color; giving corresponding scores based on the difference in chroma between the pearl and the standard sample;
Further comprises:
A holder for holding the pearl to be tested, the holder having a rotation function to enable the light source to illuminate the pearl from a plurality of angles;
during testing, the calibration plate is placed beside the pearl or on the bracket;
The light source comprises a simulated sunlight light source, an LED light source, a super-continuous white light source, a halogen lamp, a fluorescent lamp or an integrating sphere light source;
The colorimetry module comprises an imaging colorimeter, a color brightness meter, an imaging colorimeter or an optical fiber spectrometer with a collimator;
the calibration plate includes a standard whiteboard, a diffuse reflecting plate, or a flat plate having diffuse reflecting characteristics.
4. A computer storage medium having stored thereon a computer program, which when executed by a machine performs the steps of the method according to any of claims 1 to 2.
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