CN110057825B - Jade egg surface transparency effect grading instrument and grading method thereof - Google Patents
Jade egg surface transparency effect grading instrument and grading method thereof Download PDFInfo
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- CN110057825B CN110057825B CN201910362412.2A CN201910362412A CN110057825B CN 110057825 B CN110057825 B CN 110057825B CN 201910362412 A CN201910362412 A CN 201910362412A CN 110057825 B CN110057825 B CN 110057825B
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- 230000000694 effects Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000010977 jade Substances 0.000 title description 2
- 229910052640 jadeite Inorganic materials 0.000 claims abstract description 73
- 239000004744 fabric Substances 0.000 claims abstract description 4
- 235000012149 noodles Nutrition 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000011218 segmentation Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000579895 Chlorostilbon Species 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000010976 emerald Substances 0.000 description 1
- 229910052876 emerald Inorganic materials 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005375 photometry Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/87—Investigating jewels
Abstract
The invention provides a grading instrument for the transparency effect of a jadeite egg surface and a grading method thereof, comprising the following steps: the device comprises a light source, a camera and a bracket; the support includes: the device comprises a tray, a supporting frame, a first movable bracket and a second movable bracket; covering a layer of black light-absorbing cloth on the upper surface of the tray to provide a background without reflection; one end of the first movable support is arranged on the support frame, the other end of the first movable support is provided with a light source, and the light source can rotate up and down to adjust the irradiation angle of the light source; the second movable bracket is arranged at the upper end of the supporting frame, the other end of the second movable bracket is provided with a camera, and the camera is positioned above the tray and shoots vertical to the upper surface of the tray; the camera is provided with a PC connecting port which is connected to the computer through a data line. The beneficial effects of the invention are as follows: the technical scheme provided by the invention provides a direct qualitative result, and can be directly used as an accurate basis for estimating the jadeite of the finished product; not only avoids the subjective factor of human judgment, but also avoids the complexity of the prior art.
Description
Technical Field
The invention relates to the field of jewelry evaluation instruments, in particular to a grading instrument for transparency effect of a jadeite egg surface and a grading method thereof.
Background
Zhao Mingkai in the "measurement and classification of the transparency of jadeite", a quantitative method of the transparency of jadeite is proposed, and is also an evaluation method used in the national standard of jadeite at present. First, the light transmittance T of a sample with a thickness n is measured by photometry (a measuring instrument is composed of a light source, a measuring box, a photocell and a galvanometer), and then the formula is utilized(n is the thickness; T is the light transmittance of an object of n thickness in mm -1 ) The transmittance of the object with a thickness of 1mm to light, namely, the unit transmittance t, was calculated.
This method is accurate and the measurement results conform to the definition of the transparency of the material mineralogically. However, the current popularity of this method is low, because the unit transparency evaluated by it is meaningless for the overall effect of the finished jadeite product, and has no direct relation with the value of the finished jadeite product. In the jewelry market, the jadeite finished product has high value and can not be destroyed, so the evaluation basis of the jadeite finished product in the market is the 'water head' of the jadeite, namely the overall transparency effect of the jadeite finished product. The transparency effect is a transparency macroscopic effect formed by the combined action of transparency of materials as a main part, finished products as cut and colors and thickness as an auxiliary part.
In addition, the emergent light hole of the method is 2mm, and the general size of the finished jadeite product is more than 5mm and is not uniform enough, so that the result of the method cannot reflect the overall transparency effect of the jadeite, and the used components are complex and are only suitable for use and measurement in a laboratory, so that the method is not popularized.
Disclosure of Invention
In order to solve the problems, the invention provides a grading instrument for the transparency effect of the jadeite egg noodles and a grading method thereof.
A jadeite egg face transparency effect grading instrument, comprising: the device comprises a light source, a camera and a bracket;
the bracket comprises: a tray for placing jadeite, a supporting frame, a first movable bracket and a second movable bracket; and the length of the first movable bracket is smaller than the length of the second movable bracket; the supporting frame is vertically arranged;
covering a layer of black light absorption cloth on the upper surface of the tray to provide a background without reflection; one end of the first movable support is arranged on the support frame and can be adjusted up and down on the support frame, the other end of the first movable support is provided with a light source, and the light source can rotate up and down to adjust the irradiation angle of the light source;
the second movable bracket is arranged at the upper end of the support frame, can be adjusted up and down on the support frame, and is provided with a camera at the other end, wherein the camera is positioned above the tray and shoots on the upper surface of the vertical tray;
the camera is provided with a PC connecting port which is connected to the computer through a data line so as to transmit the acquired image to the computer.
Further, the camera is a VMD-P500B industrial camera.
Further, a fixed shaft is arranged at the other end of the first movable support, the fixed shaft is horizontally arranged, a rotating hole is formed in the light source, and the light source is arranged on the fixed shaft of the first movable support through the rotating hole and can vertically rotate around the fixed shaft.
Further, the light source is an adjustable brightness light source, and a brightness adjusting knob is arranged on one side of the tray and used for adjusting the brightness of the light source.
Further, when in use, firstly, the brightness of the light source is adjusted to 5500k through the illuminometer so as to simulate a natural light source; the white balance of the camera is adjusted by using a white card and a gray card, and parameters of the camera are calibrated by using RGB values and standard RGB values of a green module in a 24-color standard color card; then, putting the jadeite to be classified in the central position of the tray, and shooting the jadeite on the tray by using a camera to obtain an original jadeite image; finally, transmitting the original jadeite image to a computer for processing to obtain a grading result; the parameters include: exposure time and gain.
Further, a method for grading the transparency effect of the jadeite egg surface is applied to the device for grading the transparency effect of the jadeite egg surface, and is characterized in that: the method for grading the transparency effect of the jadeite egg noodles specifically comprises the following steps:
s101: automatically selecting a binary image gray level threshold value level1 of a gray level image of an original jadeite image by adopting an OSTU algorithm, and removing pixel points with pixel values smaller than level1 in the original jadeite image so as to scratch off the background part in the original jadeite image, thereby obtaining an egg surface image of the jadeite;
s102: removing an invalid calculation area in the egg surface image, namely, a white high-brightness part with a brightness value larger than x, so as to obtain a first egg surface image; wherein x is a preset value and is set according to specific conditions;
s103: automatically selecting a segmentation threshold level2 of the first egg surface image by adopting an OSTU algorithm, and extracting a relative bright domain of the first egg surface image according to the level 2; and taking the part outside the relative bright area in the first egg surface image as a relative dark area;
s104: dividing the first egg surface image into nine equal parts in a nine-grid mode, and grading the transparency of the jadeite according to the distribution condition of the relative dark domain and the relative bright domain in the grid furthest from the grid where the incidence point of the light is located, so as to obtain a grading result.
Further, in step S103, the method for extracting the relative bright domain of the first egg surface image according to level2 includes: and respectively taking level2 and 1.3-2.5 times of level2 as threshold values of the relative bright domains, and extracting the relative bright domains of the first egg surface image.
Further, in step S104, the first egg surface image is equally divided into nine equal parts in a nine-division manner, and the transparency of the jadeite is graded according to the specific distribution of the relative dark domain or the relative bright domain in the division furthest from the division where the incident point of the light is located, including:
1) If a relatively bright domain appears in the cell farthest from the cell where the incidence point of the light is located, the cell is a top-class 'water head';
2) If a relatively dark field appears in the cell furthest from the cell where the incident point of the light is located, the lower-class water head is adopted;
3) Otherwise, a medium "head".
The technical scheme provided by the invention has the beneficial effects that: according to the technical scheme provided by the invention, a direct qualitative result is provided through a simple and clear analysis result, and a direct factor of the value of the finished product jadeite is provided, so that the direct factor can be directly used as an accurate basis for evaluating the finished product jadeite; not only avoids the subjective factor of human judgment, but also has simple and convenient use and avoids the complexity of the prior art.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a device diagram of an apparatus for grading the effect of transparency of a jadeite egg surface in an embodiment of the invention;
FIG. 2 is a flow chart of a method for grading the transparency effect of a jadeite egg surface in an embodiment of the invention;
FIG. 3 is an effect diagram of grading a certain jadeite in an embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
The embodiment of the invention provides a jadeite egg surface transparency effect grading instrument and a grading method thereof.
Referring to fig. 1, fig. 1 is a device diagram of an apparatus for grading effect of transparency of a jadeite egg surface according to an embodiment of the present invention, including: a light source 1 and a camera 2 bracket 5;
the bracket 5 includes: a tray 51 for putting jadeite, a supporting frame 52, a first movable bracket 53 and a second movable bracket 54; and the length of the first movable bracket 53 is smaller than the length of the second movable bracket 54; the support frame 52 is vertically arranged;
covering a layer of black light-absorbing cloth on the upper surface of the tray 51 to provide a background without reflection; one end of the first movable bracket 53 is mounted on the support frame 52 and can be adjusted up and down on the support frame 52, the other end is mounted with the light source 1, and the light source 1 can rotate up and down to adjust the light source irradiation angle;
the second movable bracket 54 is mounted at the upper end of the supporting frame 52 and can be adjusted up and down on the supporting frame 52, the other end of the second movable bracket is provided with a camera 2, and the camera 2 is positioned above the tray 51 and shoots on the upper surface of the vertical tray;
the camera 2 is provided with a PC connection port 21 which is connected to a computer through a data line so as to transmit the acquired image to the computer.
The camera 2 is a VMD-P500B industrial camera.
The other end of the first movable support 53 is provided with a fixed shaft which is horizontally arranged, the light source 1 is provided with a rotating hole, and the light source 1 is arranged on the fixed shaft of the first movable support 53 through the rotating hole and can rotate up and down around the fixed shaft.
The light source 1 is a brightness-adjustable light source, and a brightness adjusting knob 4 is arranged on one side of the tray 51 and used for adjusting the brightness of the light source 1; in the embodiment of the invention, the light source 1 is a spotlight with an optical filter.
When in use, the brightness of the light source 1 is firstly adjusted to 5500k by an illuminometer so as to simulate a natural light source; the white balance of the camera 2 is adjusted by using a white card and a gray card, and parameters of the camera 2 are checked by using RGB values and standard RGB values of a green module in a 24-color standard color card; then, putting the jadeite to be classified in the center of the tray 51, and shooting the jadeite on the tray 51 by using the camera 2 to obtain an original jadeite image; finally, the original image is transmitted to a computer for processing, and a grading result is obtained; the parameters include: exposure time and gain.
Referring to fig. 2, fig. 2 is a flowchart of a method for grading a transparency effect of a jadeite surface, which is applied to the apparatus for grading a transparency effect of a jadeite surface, and specifically includes the following steps:
s101: automatically selecting a binary image gray level threshold value level1 of a gray level image of an original jadeite image by adopting a maximum inter-class variance algorithm (OSTU), and removing pixel points with pixel values smaller than level1 in the original jadeite image to scratch off the background part in the original jadeite image so as to obtain an egg surface image of the jadeite;
s102: removing an invalid calculation area in the egg surface image, namely, a white high-brightness part with a brightness value larger than x, so as to obtain a first egg surface image; the white high-brightness part comprises an incident point reflection highlight area and a mosaic area; wherein x is a preset value, and is set according to specific conditions, and is set to be 95 in the embodiment of the invention;
s103: automatically selecting a segmentation threshold level2 of the first egg surface image by adopting an OSTU algorithm, and extracting a relative bright domain of the first egg surface image according to the level 2; and taking the part outside the relative bright area in the first egg surface image as a relative dark area;
s104: dividing the first egg surface image into nine equal parts in a nine-grid mode, and grading the transparency of the jadeite according to the distribution condition of the relative dark domain and the relative bright domain in the grid furthest from the grid where the incidence point of the light is located, so as to obtain a grading result.
In step S102, small area removal and hole filling treatment can be performed on the extracted part to obtain a complete jadeite egg face image;
and small reflection points caused by other light sources and the like are still remained in the emerald egg surface image after the invalid calculation area in the egg surface image is eliminated, so that certain errors are caused. Therefore, after the reflective point and the embedded part are removed, the point of which the reflective point and the seven points are in the effective area is selected as a starting point, the point of which the reflective point and the seven points are in the effective area is taken as an end point, and the points are filled in the first egg surface image.
In step S103, the method for extracting the relative bright domain of the first egg surface image according to level2 includes: and respectively taking level2 and 1.3-2.5 times of level2 as threshold values of the relative bright domains, and extracting the relative bright domains of the first egg surface image.
In step S104, the first egg surface image is equally divided into nine equal parts in a nine-division manner, and the transparency of the jadeite is graded according to the specific distribution of the relative dark domain or the relative bright domain in the division furthest from the division where the incidence point of the light is located, including:
1) If a relatively bright field appears in the cell furthest from the cell where the incident point of light is located, the cell is a superior water head (in the jadeite egg surface with higher transparency effect, a relatively bright field is formed at one end of the egg surface cambered surface far from the incident light bright point, which is consistent with the phenomenon of fluorescence);
2) If a relatively dark field appears in the cell furthest from the incident point of the light, the cell is a lower-level water head (in the jadeite egg surface with poor transparency effect, a relatively dark field is formed at one end far from the incident light spot on the cambered surface of the egg surface because most of light beams are reflected and absorbed at the incident point);
3) Otherwise, the color is a medium water head (in the jades egg surface with the medium transparency effect, the overall brightness is uniform, and in the image processing result, no relatively bright area and no relatively dark area exist).
Examples: if the incidence point of the light is in the upper left corner, the distribution condition of the relative bright domain and the relative dark domain extracted from the lower right corner is used as the grading basis.
As shown in fig. 3, an effect diagram of grading a certain jadeite in an embodiment of the present invention is shown.
The beneficial effects of the invention are as follows: according to the technical scheme provided by the invention, a direct qualitative result is provided through a simple and clear analysis result, and a direct factor of the value of the finished product jadeite is provided, so that the direct factor can be directly used as an accurate basis for evaluating the finished product jadeite; not only avoids the subjective factor of human judgment, but also has simple and convenient use and avoids the complexity of the prior art.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The method for grading the transparency effect of the jadeite egg surface is applied to a jadeite egg surface transparency effect grading instrument and is characterized in that: the jadeite egg face transparency effect grading instrument comprises: a light source (1), a camera (2) and a bracket (5);
the bracket (5) comprises: a tray (51) for placing jadeite, a supporting frame (52), a first movable bracket (53) and a second movable bracket (54); and the length of the first movable bracket (53) is smaller than the length of the second movable bracket (54); the supporting frame (52) is vertically arranged;
covering the upper surface of the tray (51) with a layer of black light-absorbing cloth to provide a background without reflection; one end of the first movable support (53) is arranged on the support frame (52) and can be adjusted up and down on the support frame (52), the other end of the first movable support is provided with the light source (1), the light source (1) can move pivotally around an axis extending along a first direction, and the first direction is vertical to the up and down direction in a plane so as to adjust the irradiation angle of the light source;
the second movable bracket (54) is arranged at the upper end of the supporting frame (52) and can be adjusted up and down on the supporting frame (52), the other end of the second movable bracket is provided with a camera (2), and the camera (2) is arranged above the tray (51) and shoots on the upper surface of the vertical tray (51);
the camera (2) is provided with a PC connecting port (21) which is connected to the computer through a data line so as to transmit the acquired image to the computer;
the method for grading the transparency effect of the jadeite egg noodles specifically comprises the following steps:
s101: automatically selecting a binary image gray level threshold value level1 of a gray level image of an original jadeite image by adopting an OSTU algorithm, and removing pixel points with pixel values smaller than level1 in the original jadeite image so as to scratch off the background part in the original jadeite image, thereby obtaining an egg surface image of the jadeite;
s102: removing an invalid calculation area in the egg surface image, namely, a white high-brightness part with a brightness value larger than x, so as to obtain a first egg surface image; wherein x is a preset value and is set according to specific conditions;
s103: automatically selecting a segmentation threshold level2 of the first egg surface image by adopting an OSTU algorithm, and extracting a relative bright domain of the first egg surface image according to the level 2; and taking the part outside the relative bright area in the first egg surface image as a relative dark area;
s104: dividing the first egg surface image into nine equal parts in a nine-grid mode, and grading the transparency of the jadeite according to the distribution condition of the relative dark domain and the relative bright domain in the grid furthest from the grid where the incidence point of the light is located, so as to obtain a grading result.
2. The method for grading the transparency effect of the jadeite egg noodles according to claim 1, which is characterized in that: the camera (2) is a VMD-P500B industrial camera.
3. The method for grading the transparency effect of the jadeite egg noodles according to claim 1, which is characterized in that: the other end of the first movable support (53) is provided with a fixed shaft which is horizontally arranged, the light source (1) is provided with a rotating hole, and the light source (1) is arranged on the fixed shaft of the first movable support (53) through the rotating hole and can rotate up and down around the fixed shaft.
4. The method for grading the transparency effect of the jadeite egg noodles according to claim 1, which is characterized in that: the light source (1) is a brightness-adjustable light source, and one side of the tray (51) is provided with a brightness adjusting knob (4) for adjusting the brightness of the light source (1).
5. The method for grading the transparency effect of the jadeite egg noodles according to claim 1, which is characterized in that: when in use, the brightness of the light source (1) is adjusted to 5500k through the illuminometer so as to simulate a natural light source; the white balance of the camera (2) is adjusted by using a white card and a gray card, and parameters of the camera (2) are calibrated by using RGB values and standard RGB values of a green module in a 24-color standard color card; then, putting the jades to be classified in the central position of a tray (51), and shooting the jades on the tray (51) by using a camera (2) to obtain an original jades image; finally, transmitting the original jadeite image to a computer for processing to obtain a grading result; the parameters include: exposure time and gain.
6. The method for grading the transparency effect of the jadeite egg noodles according to claim 5, wherein the method comprises the following steps of: in step S103, the method for extracting the relative bright domain of the first egg surface image according to level2 includes: and respectively taking level2 and 1.3-2.5 times of level2 as threshold values of the relative bright domains, and extracting the relative bright domains of the first egg surface image.
7. The method for grading the transparency effect of the jadeite egg noodles according to claim 5, wherein the method comprises the following steps of: in step S104, the first egg surface image is equally divided into nine equal parts in a nine-division manner, and the transparency of the jadeite is graded according to the specific distribution of the relative dark domain or the relative bright domain in the division furthest from the division where the incidence point of the light is located, including:
1) If a relatively bright domain appears in the cell farthest from the cell where the incidence point of the light is located, the cell is a top-class 'water head';
2) If a relatively dark field appears in the cell furthest from the cell where the incident point of the light is located, the lower-class water head is adopted;
3) Otherwise, a medium "head".
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| CN204832053U (en) * | 2015-08-19 | 2015-12-02 | 武汉地质资源环境工业技术研究院有限公司 | Emerald appraisal appearance |
| CN106959293A (en) * | 2015-11-13 | 2017-07-18 | 康耐视公司 | The system and method for defect on reflective surface is detected by vision system |
| CN107345908A (en) * | 2017-06-26 | 2017-11-14 | 浙江大学 | A kind of scattering system for obtaining fruit multiaspect diffusing reflection information |
| CN206990894U (en) * | 2017-07-12 | 2018-02-09 | 深圳法宝技术有限公司 | Gemolite |
| CN108009564A (en) * | 2017-10-31 | 2018-05-08 | 昆明理工大学 | A kind of green jade bracelet quality grading method based on radial basis function neural network model |
| CN109060670A (en) * | 2018-08-08 | 2018-12-21 | 华中科技大学 | It is a kind of to reflect and transmit integrated Hyperspectral imager and method |
| CN210604415U (en) * | 2019-04-30 | 2020-05-22 | 中国地质大学（武汉） | Jadeite egg surface transparency effect grading instrument |
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