HK1190785A - Method for determining quality of heart & cupid optical effect of diamond, and device therefor - Google Patents

Description

Method and device for determining whether heart & cupid optical effect of diamond is good or not

Technical Field

The present invention relates to a method and a device for determining the quality of heart & cupid optical effects of a diamond, which can objectively determine the quality of heart & cupid optical effects of a diamond by using program software based on a heart & cupid image obtained by any one of a method of measuring the size of a round bright type cut diamond (hereinafter, simply referred to as a diamond) to be determined by a size measuring device and creating a heart & cupid (registered trademark) image by computer graphics (hereinafter, referred to as CG) based on the measured size; or a method of directly photographing (so-called real photographing) the diamond with a CCD camera to obtain a heart & cupid image.

Background

In the conventional diamond heart & cupid optical effect quality determination, a gem evaluator performs sensory determination on the quality of a gem based on 8 heart images and 8 cupid images captured by a CCD camera based on individual criteria.

As another prior art, the following patent document 1 is known.

A gemstone identification device comprising: a gemstone illumination unit having an illumination space in which a gemstone to be identified is placed, and illuminating the gemstone placed in the illumination space; a holding mechanism for holding the gemstone so that the pose of the gemstone can be changed in the illumination space of the gemstone illumination unit; a light source that generates light incident on an illumination space of the gemstone illumination unit; an enlarging optical system for reading the reflected light of the gemstone illuminated by the gemstone illumination unit and forming an enlarged image of the gemstone; an image pickup mechanism that picks up a gem image formed by the magnifying optical system; an image memory that stores the gem image read from the image pickup mechanism; a display mechanism that displays at least the gemstone image; and a quality estimation means for calculating at least one quality information of a polished state, a color tone, a clarity, a carat, and an inclusion state of the gemstone based on at least one of the position information and the brightness information of the gemstone image stored in the image memory (refer to claim 1 of japanese patent No. 3392926).

Further, a gemstone identification method is characterized in that light from a light source is incident on a gemstone illumination unit, a gemstone arranged in the gemstone illumination unit is illuminated from various directions, a gemstone is imaged from a position facing the gemstone, image information is read, the luminance distribution of the gemstone is measured based on the image information to create a histogram, the mode and the distribution state on the lower luminance side than the mode of the histogram are analyzed, and the shape of the gemstone and the quality of the polished state of the surface are determined based on the result of the histogram and evaluated (see claim 20 of japanese patent No. 3392926).

Prior art documents

Patent document

Patent document 1: japanese patent No. 3392926

Disclosure of Invention

Conventionally, a gem appraiser takes a picture of a diamond with a CCD camera and judges whether the gem is good or not based on 8 heart images and 8 cub images, and therefore, there is a difficulty in subjecting the appraiser to the subjective judgment based on the difference in the years of experience, skill level, and the like of the appraiser.

Further, although the above patent document 1 has an object to provide a gem identification device and a method thereof capable of easily realizing gem identification with high reliability from objective data without depending on the judgment of a skilled gem identifier, the above patent document 1 only describes the contents of calculating arbitrary quality information such as cut, color, clarity, carat, surface polishing state, and inclusions of a gem (refer to paragraph 0042 of the specification), does not show any specific judgment criteria for 8 cardioid images and 8 cubit images of a diamond intended by the present invention, and does not describe any suggestion point.

The present invention provides a method and a device for determining the quality of heart & cupid optical effect of a diamond, which can objectively determine the quality of heart & cupid optical effect of a diamond based on the same determination criterion using determination software, even when the diamond is actually photographed by a CCD camera directly and the quality of heart & cupid optical effect of the diamond is determined based on an obtained heart & cupid image, or when data obtained by measuring the diamond by a size measuring device is read by CG and the quality of heart & cupid optical effect of the diamond is determined based on an obtained heart & cupid image.

Further, another object of the present invention is to provide a method and an apparatus for determining the quality of heart & cupid optical effect of a diamond, which can quantitatively determine the quality of heart & cupid optical effect of a diamond by numerically converting the whole and each form of symmetry, the size, mutual balance, positional deviation, and the like of each heart and cupid shape with respect to 8 heart images and 8 cupid images of a diamond, and can quickly and accurately determine the quality of heart & cupid optical effect of the same diamond without being limited to a place and time by transmitting only a heart image and a cupid image created in advance by CG to the diamond even if the diamond is not a quality determination target in the hand.

Further, an object of the present invention is to provide a method and a device for determining the quality of heart & cupid optical effect of a diamond, in which, in a CG-based image of the diamond, since an ID and a mark specifying the diamond are input in advance to the CG image together with size measurement data at a stage of measuring the size of the diamond to be determined by a size measuring device, it is possible to eliminate a trouble such as the conventional authenticator determining the quality of heart & cupid optical effect of the diamond based on a photographed image different from that of the diamond to be determined, and to further improve the reliability of the quality determination of heart & cupid optical effect of the diamond.

Means for solving the technical problem

The present invention is a method for determining the quality of heart & cupid optical effect of a diamond, comprising: reading the size of the round brilliant cut diamond to which the ID is added by a size measuring device using a computer graphics (referred to as CG) and outputting a heart & cupid image and the ID, or capturing the heart & cupid image of the diamond and outputting the ID by a CCD camera; storing data of symmetry of 8 heart marks, variation of areas of the heart marks, offset of front end of each heart mark, depth of cut of each heart mark, ratio of width of right and left shoulders of each heart mark to the whole width, ratio of interval of boundary part of each heart mark and V mark positioned on inner side of the radial line to the whole width of each corresponding heart mark, ratio of area of each V mark to standard heart area, and ratio of right side length to left side length of the V mark in a computer database, and performing arithmetic processing on the data to determine whether the heart mark is good or not; and storing data on the symmetry of the 8 hill marks, the degree of deviation obtained from the ratio of the maximum value to the minimum value of the area of each hill mark, whether a straight line connecting the outer tip of each hill mark and the center of the intersection coincides with the center of the tip, whether there is a deviation with an angle, whether the arrow tip of each hill mark sharply contacts the girdle or whether the arrow tip of each hill mark sharply contacts the girdle, and whether the arrow tip of each hill mark sharply contacts the girdle or contacts the girdle with a contact width, in a computer database, and performing arithmetic processing on the data to determine whether the hill mark is good or not.

The method for determining the quality of a diamond according to the heart & cupid optical effect according to claim 1 of the present invention comprises a step of digitizing the symmetry of each of the heart mark and the cupid mark, the shift of each shape, and the shift of the distance between the heart mark and the V mark, reading the data by a computer, and performing a determination process by the computer to determine the quality, and further comprises 3 determination region means for determining whether a qualified region, a rejected region, and a qualified and rejected region exist in the classification, or 2 determination region means for determining whether a qualified region and a rejected region exist in the classification.

The method for determining the quality of a heart & cupid optical effect of a diamond when the diamond is photographed by a CCD camera according to claim 1 or 2 of the present invention includes a step of reading the number of light and dark differences between a heart mark image and a cupid mark image by a computer and performing quality determination by a determination process by the computer.

The present invention relates to a diamond heart & cupid optical effect quality determination device, comprising: a means for obtaining a heart & cupid image from a real image captured by a CCD camera or a means for obtaining a heart & cupid image by CG (computer graphics) reading the dimensions of each part of a pattern of light irradiated to a diamond polished at a specific rate by a dimension measuring device; a mechanism for reading the same ID as that added to the diamond as a live shot image or a CG image; means for storing the heart & cupid image in a computer database; a computer arithmetic processing device for performing arithmetic operation based on the numerical value read from the computer database for each determination item based on each heart & cupid image managed by the ID; and a display means for judging whether the diamond is good or not based on the arithmetic processing.

Effects of the invention

The present invention provides a method and a device for determining the quality of the heart & cupid optical effect of a diamond, which can objectively determine the quality of the heart & cupid optical effect of a diamond based on the same determination criterion using determination software, even when the diamond is directly imaged by a CCD camera and the quality of the heart & cupid optical effect of the diamond is determined based on an obtained heart & cupid image, or when data obtained by measuring the diamond by a size measuring device is read by CG and the quality of the heart & cupid optical effect of the diamond is determined based on the obtained heart & cupid image.

In the present invention, regarding each of the 8 heart images and the 8 cupid images of the diamond, the symmetry, the sizes of the heart and cupid shapes, the balance between the heart and cupid shapes, the positional deviation, and the like are expressed in numerical values as a whole, and the data are stored in a computer database and read, whereby it is possible to quantitatively determine whether the heart & cupid optical effect of the diamond is good or not.

In the present invention, even if there is no diamond to which an ID is added to be a quality judgment target in hand, since the heart image and the cupid image of the same ID created in advance by CG for the diamond are stored in the computer database, it is possible to quickly and accurately judge the quality of the heart & cupid optical effect of the diamond to which the same ID is added by the network loop regardless of the place and time.

In addition, in the present invention, as for the heart image and the cupid image of the same ID created by reading the numerical value of the diamond to which the ID is added, which is to be determined by the size measuring device, by CG, the heart image and the cupid image of the diamond to be determined correspond to each other one by one, it is possible to eliminate the trouble of the conventional identifier for determining the quality of the diamond based on the erroneous real shot image, and it is possible to further improve the reliability of the quality determination of the heart & cupid optical effect of the diamond.

Drawings

Fig. 1 shows CG or photographed heart & cupid images of a diamond according to the present invention, fig. 1 (a) shows a qualified determination result, and fig. 1 (b) shows a rejected determination result, and a red circle (black and white in the drawing for convenience) indicates a rejected determination reason site.

Fig. 2 shows a CG-based heart mark & cupid mark image, fig. 2 (a) shows a heart mark image, and fig. 2 (b) shows a cupid mark image, which are targets for determining the heart & cupid optical effect of the diamond of the present invention.

Fig. 3 shows a heart mark & cupid mark image by actual shooting, which is a target for determining the quality of the heart & cupid optical effect of the diamond according to the present invention, fig. 3 (a) shows a heart mark image, and fig. 3 (b) shows a cupid mark image.

Fig. 4 (a) shows angles B1 to B8 between the heart mark centers for judging whether the symmetry of 8 heart mark images of the diamond of the present invention is good or bad. Fig. 4 (b) shows the quality of symmetry obtained by a computer reading the absolute value of the sum of the angle between the centers of adjacent heart-shaped marks minus 45 degrees, and by arithmetic processing, in a quality determination chart for a grade a (good) and a grade C (bad).

Fig. 5 (a) shows areas C1 to C8 of each heart mark of the diamond of the present invention, and shows a graph for determining the degree of deviation of the image and whether each heart image is of the optimum size, fig. 5 (b) shows a portion of the area of one heart mark surrounded by a contour, and fig. 5 (C) shows whether the area of each heart mark is of the optimum size by a quality determination chart of a grade a (good) and a grade C (bad).

Fig. 6 (a) is a diagram showing the displacement of the tip portion of each heart mark of the diamond of the present invention, fig. 6 (b) is a diagram showing an example in which the tip portions of the heart marks are not concentrated at one point, fig. 6 (C) is a diagram showing an example in which the tip portions of the heart marks are concentrated at one point, and fig. 6 (d) shows the degree of displacement of the tip portions of the heart marks from the position concentrated at one point in a quality determination chart of the grades a to C. Fig. 6 (e) is a table showing the result of the quality determination based on the deviation of the heart-shaped distal end portion of the determination result display device.

Fig. 7 (a) to (f) are explanatory views showing the depth of cut of each heart mark of the diamond of the present invention, and fig. 7 (g) is a quality determination chart showing the quality of heart & cupid optical effect of the diamond obtained from the depth of cut of each heart mark image of the diamond of the present invention. Fig. 7 (h) is a table showing the result of the quality determination based on the heart-shaped cut depth of the determination result display device.

Fig. 8 (a) and (b) are explanatory views showing measurement sites for determining the quality of the left and right shoulder widths of each heart mark of the diamond of the present invention, and fig. 8 (c) shows the quality of the left and right shoulder widths of each heart mark image by a quality determination chart. Fig. 8 (d) is a table showing the result of the quality determination of the heart-shaped shoulder portion based on the determination result display device.

Fig. 9 (a) and (b) are diagrams for judging the quality of the interval between each heart mark and the boundary portion of the V-mark located in the direction of the tip of the heart mark in the diamond of the present invention, and fig. 9 (c) is a diagram for showing the quality of the interval between each heart mark and the boundary portion of the V-mark located in the direction of the tip of the heart mark in a quality judgment chart. Fig. 9 (d) is a table showing the result of the quality determination based on the interval of the boundary portion of the determination result display device.

Fig. 10 (a) to (c) are diagrams for judging whether the diamond of the present invention has a deviation in the left-right length of the size of the V-shaped mark located inside the tip of each heart mark, and fig. 10 (d) shows a graph for judging whether the V-shaped mark has a good or bad. Fig. 10 (e) is a table showing the result of the quality determination based on the size of the V-shaped flag of the determination result display device.

Fig. 11 (a) to (c) are diagrams for judging whether or not the V-shaped marks of the diamond of the present invention have different horizontal lengths, and fig. 11 (d) is a graph showing the quality of the V-shaped marks in a quality judgment chart. Fig. 11 (e) is a table showing the result of the quality determination based on the left-right length of the V-shaped mark of the determination result display device.

FIG. 12 (a) is a diagram showing the judgment of the quality of symmetry and length of each of the hills of the diamond of the present invention. Fig. 12 (b) shows the quality of the symmetry of the hillock bit in a quality determination chart. Fig. 12 (c) shows the quality of the hillock length in a quality determination chart.

Fig. 13 (a) is a graph showing the variation in the area of each hill of the diamond of the present invention.

Fig. 14 (a), (b), (c), (d), and (e) show the state of the deviation of the arrow of the cupule.

Fig. 15 (a), (b), and (c) show the sharpness of the tip of the arrow in each hill of the diamond of the present invention.

FIGS. 16 (a), (b), (c), (d) and (e) show the difference in brightness of each hill of the diamond of the present invention. For convenience, the difference in brightness of the cupid image is shown with an interval of hatching according to the intensity of brightness.

FIG. 17 is a diagram illustrating the structure of a diamond heart & cupid optical effect quality determination device according to the present invention.

FIG. 18 is a flowchart showing a method of determining the quality of the heart & cupid optical effect of a diamond according to the present invention.

Description of the symbols

1-Diamond (round bright type cutting diamond)

2-Heart shaped sign

3-V shaped sign

4-Cupid mark

5-size measuring device

6-CG manufacturing device

7-real shooting camera device based on CCD camera

8-image and decision database

9-read/operation device for judgment item

10-determination result display device

Detailed Description

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the CG image is summarized as follows.

In the round brilliant cut diamond 1 (hereinafter, simply referred to as diamond), the size and angle of each part are accurately measured for the shape of the diamond observed from directly above the crown (not shown) side including the girdle (not shown) or above of the table top (not shown) and the shape of the diamond observed from the pavilion (not shown) side below the girdle. In light incident on, for example, a table surface of a diamond, a part of the light is reflected light on the surface and is diffused to the outside, and the remaining part of the light is refracted light refracted inside the diamond, and is refracted on a pavilion surface and emitted to the atmosphere. The refracted rays within the diamond are sometimes totally reflected depending on the angle of incidence. In this embodiment, the refractive index of diamond is calculated to be 2.417, but the value is not necessarily limited to this value. In this example, a case is shown in which the beam incident from directly above the table top and the crown side is 1000 (1 μ)/mm and is applied from the end to the end of the diamond, but the number is not necessarily limited to this value. For example, when the table and the crown are vertically and horizontally divided into a lattice shape on the order of micrometers, and a light beam is incident on a diamond from a direction perpendicular to the table, a heart-shaped image is obtained by simulating the light beam, and a hill-shaped image is obtained by receiving a light beam from the opposite pavilion side.

The method for determining the quality of heart & cupid optical effect of diamond according to the present invention comprises the steps of: a step of measuring the size of the diamond 1 to which the ID is added as a determination target by a size measuring device 5, and reading the measurement result by computer graphics (referred to as CG) to obtain a heart & cupid image to which the ID is added; or a step of taking a heart & cupid image of the diamond with a CCD camera. Then the following procedures are carried out: regarding the 8 heart marks, symmetry, variation in area, offset of the tip, depth of the notch, ratio of the width of the left and right shoulders to the entire width, ratio of the interval between each heart mark and the boundary portion of the V mark located on the inner side of the heart mark on the radial line to the entire width of the corresponding heart mark, ratio of the area of each V mark to the area of the standard heart mark, and ratio of the length of the V mark on the right side to the length of the V mark on the left side are read by a computer, and the computer performs arithmetic processing on the read numerical values to determine whether or not the marks are good. Then the following procedures are carried out: regarding the 8 hill marks, the symmetry, the degree of deviation obtained from the ratio of the maximum value to the minimum value of the area, and whether or not the straight line connecting the outer tip portion and the center side tip portion coincides with the center point, whether or not there is a deviation with an angle, whether or not the arrow tip portion sharply contacts the girdle or whether or not the arrow tip portion contacts the girdle with a contact width are read by a computer, and the read numerical values are subjected to determination processing by the computer, thereby performing the classification determination of the quality.

Fig. 4 shows CG-based cardiac marker images to be used for determining the quality of the heart & cupid optical effect of the diamond of the present invention, and fig. 4 (a) shows angles B1 to B8 between cardiac marker centers for determining the quality of the symmetry of 8 cardiac marker images of the diamond of the present invention. Fig. 4 (b) shows a good/bad judgment chart of a and C showing the symmetry obtained by subtracting the absolute value of the sum of 45 degrees from the angle between the centers of adjacent heart marks.

The present invention is provided with a determination result display device as determination means for determining whether the heart & cupid optical effect of a diamond is good or not, and obtains a determination result by displaying 8 horizontal bars in either A, B, C or A, C region (the display of the horizontal bars is omitted in this embodiment and this figure). In fig. 4, in the quality determination table, when 8 heart mark images are bilaterally symmetric, 8 horizontal bars appear in the range of a in the graph as the rank a, and it is determined that the image is good. If there are 1 non-bilaterally symmetric heart mark images, 1 bar appears in the range of C in the graph as a rank C, and the determination is failed. In this way, in the determination, 8 horizontal bars appear in any range of the A, B, C ranges in the graph, and the quality of the diamond is determined according to the number of the horizontal bars. The same method is used for the determination in the following figures, but the determination is passed when 1 to 3 horizontal bars appear in the range of B in the graph, and the remark is that the determination is failed when 4 or more horizontal bars appear.

As the determination items, in the case of the heart mark, (1-1) symmetry (good or bad of the symmetry of the heart), (1-2) deviation of area, (1-3) deviation of tip portion, (1-4) incision depth, (1-5) shoulder width, (1-6) interval of boundary portion between the heart mark and the V mark, (1-7) deviation of area of the V mark, and (1-8) inconsistency of the V mark are respectively the determination targets.

First, regarding how good the symmetry of the heart shape is, in fig. 4 (a), the standard of the angles B1 to B8 is an angle of 45 degrees. B1-45= | β 1 | B2-45= | β 2 | B3-45 | β 3 |, B4-45= | β 4 |, B5-45 | = | β 5 | B6-45= | β 6 |, B6-45= | β 6 |, B7-45= | β 7 | B8-45= | β 8 |, and | β 8 |, were obtained. The larger Σ β, the poorer the symmetry. The threshold value of | Σ β | is changeable.

The quality determination of symmetry shown in fig. 4 (b) is represented by quality determination charts of grades a and C, and the quality determination chart is a grade a when the quality determination chart is 0.00 or more and less than 2.00, and the heart-shaped symmetry is judged to be acceptable, and the quality determination chart is a grade C when the quality determination chart is 2.00 or more, and the symmetry is judged to be unacceptable. The numerical ranges of the level a and the level C are not limited to this example.

Fig. 5 (a) shows areas C1 to C8 of each heart mark of the diamond of the present invention, which are used to determine the degree of deviation of each heart image and whether each heart image has an optimal size. Fig. 5 (b) shows the area of one heart mark in the area surrounded by the outline, and fig. 5 (C) shows whether the area of each heart mark is the optimum size by the quality determination chart of a and C, and the area of the heart mark is judged to be the optimum and qualified when the area is 0.00 or more and less than 0.40, the area is judged to be the optimum and the area is judged to be the qualified, and the area is judged to be the grade C when the area is 0.40 or more and the area is judged to be the unqualified.

The areas of the hearts on the circles drawn by red lines (black for convenience of drawing) are C1 to C8, respectively. The maximum value of each heart-shaped area is Cmax, the minimum value is Cmin, and Cmax/Cmin = C. If the value of C is 1, the size is said to be not varied. In the present example, the case where the C value is less than 1.00 to 1.11 is acceptable, and 1.11 or more is unacceptable is shown. The degree of deviation of the areas of the respective heart shapes is obtained from the values of the maximum value Cmax and the minimum value Cmin, and it is not necessary to determine whether or not the heart shape has an optimal size. Therefore, the determination as to whether or not the heart shape is the optimum size is calculated according to mathematical formula 1 and obtained from the difference from the factor of [ (C of the most standard heart shape)/(the entire area (standard)) ] × 100. This value can be set to a certain ideal value regardless of the size of the diamond. The value is [ 2.91-3.29 ] in sense, and the average value is about 3.18 as a standard value. In mathematical formula 1, the standard value is calculated as 3.2. The size of the heart shape is closer to the standard as the value Σ d obtained from mathematical formula 1 of C1 to C8 is closer to 0.

[ mathematical formula 1]

FIG. 6 (a) is a view showing the displacement of the tip of each heart mark of the diamond of the present invention. Fig. 6 (b) shows an example in which the tip portions of the heart marks are not concentrated at one point. Fig. 6 (c) shows an example in which the tip portions of the heart marks are concentrated at one point. Fig. 6 (d) is a graph showing the degree of deviation of the heart-shaped tip from a position centered on a single point, using a level a to a level C quality determination chart. Fig. 6 (e) is a table showing the result of the quality determination based on the deviation of the heart-shaped distal end portion of the determination result display device.

When fig. 6 (b) and 6 (c) are compared, the heart-shaped distal end portions are not concentrated at one point in fig. 6 (b). Assuming that the offset of the tip is a1 and the overall length of the heart is a, a1/a1= a. When a1 is 1 and a1 is in the range of 0.00 or more and less than 0.06, the product is judged as pass, and 0.06 or more and less than 0.17 are in the range of both pass and fail, and 0.17 or more is judged as fail. The following is shown in the decision table: when there are 8 heart marks that do not have a shift at the heart tip, the determination is made as good, and when there are 1 heart mark that belongs to the C region in the graph, the determination is made as good, whereas when there are 1 to 3 heart marks that belong to the B region in the graph, 4 or more are determined as bad.

FIGS. 7 (a) to (f) are explanatory views showing the depth of the cut of each heart mark of the diamond of the present invention. Regarding one heart mark shown in fig. 7 (a), when the incision depth is e1 and the entire length of the heart mark is 100 in fig. 7 (b), the ratio of the incision depth to the entire length of the heart mark is e 1/100. Similarly, the value is e2/100 in FIG. 7 (d) and e3/100 in FIG. 7 (f). The ratio of the incision depth for standard cardioid markers is 0.229. Therefore, the heart-shaped notch is judged as pass when the ratio of the heart-shaped notch depths is, for example, 0.20 or more and less than 0.37 as shown in fig. 7 (g), and is judged as pass, and the range of 0.14 or more and less than 0.20 or 0.37 or more and less than 0.46 is grade B, and both pass and fail exist, and the range of 0.00 or more and less than 0.14 or 0.46 is grade C, and is judged as fail. The following is shown in the decision table: when 8 heart marks having a good heart-shaped cut depth are present, the heart mark is determined to be acceptable, and if 1 heart mark belonging to the C region in the graph is present, the heart mark is determined to be unacceptable, whereas if 1 to 3 heart marks belonging to the B region in the graph are present, the heart mark is determined to be acceptable, and 4 or more heart marks are determined to be unacceptable.

Fig. 8 (a) and (b) are explanatory views showing measurement sites for determining whether the widths of the left and right shoulders of each heart mark of the diamond of the present invention are good or bad. Fig. 8 (c) shows the quality of the left and right shoulder widths of each heart-shaped mark image in a quality determination chart.

As shown in fig. 8 (a), the widths of the heart marks are a1, a2, … … a7, and A8, the left shoulder width of one heart is a1, and the right shoulder width is a2, and are (a 1/a 1) = k1, (a 2/a 1) = k 2. Hereinafter, in this order, (a 1/a 2) = k3, (a 2/a 2) = k4, … … (a 1/a 8) = k15, and (a 2/a 8) = k 16.

Fig. 8 (C) is a graph showing the quality of the left and right shoulder widths of each heart-shaped logo image, wherein a rank a is 0.10 or more and less than 0.30, and the heart-shaped logo image is acceptable, a rank B is 0.05 or more and less than 0.10 or 0.30 or more and less than 0.53, and both acceptable and unacceptable exist, and a rank C is 0.00 or more and less than 0.05 or 0.53, and the heart-shaped logo image is determined to be unacceptable. Fig. 8 (d) is a table showing the result of the quality determination of the heart-shaped shoulder portion based on the determination result display device. The following is shown in the decision table: when 8 heart marks having a good heart shoulder width are present, the heart mark is determined to be acceptable, and if 1 heart mark belonging to the C region in the graph is present, the heart mark is determined to be unacceptable, whereas if 1 to 3 heart marks belonging to the B region in the graph are present, 4 or more heart marks are determined to be unacceptable.

Fig. 9 (a) and (b) show diagrams for judging whether or not the interval between each heart mark and the boundary portion of the V mark located in the direction of the tip of the heart mark of the diamond of the present invention is good. Fig. 9 (c) shows the quality of the interval between each heart mark and the boundary portion of the V mark located in the direction of the tip of the heart mark in the quality determination chart. Fig. 9 (d) is a table showing the result of the quality determination based on the interval of the boundary portion of the determination result display device.

The interval between each heart mark and the boundary between the V-shaped mark located in the direction of the front end of the heart mark is a1, the width of the heart mark is a1, (a 1/a 1) is obtained, a1 is 1, a is a rank a when a1 is in the range of 0.02 or more and less than 0.15, a is a pass, a range a1 is 0.01 or more and less than 0.02 or 0.15 or less and less than 0.33 is a rank B, a pass and a fail are both present, and a rank C when a1 is 0.00 or more and less than 0.01 or 0.33, a fail is obtained. The following is shown in the decision table: when there are 8 heart marks with good intervals at the boundary, the chart is judged to be qualified, and when there are 1 heart mark belonging to the C region in the chart, the chart is judged to be qualified, and when there are 1 to 3 heart marks belonging to the B region in the chart, 4 or more heart marks are judged to be unqualified.

Fig. 10 (a) to (c) are diagrams for determining whether or not the size of the V-shaped mark located inside the tip of each heart-shaped mark of the diamond of the present invention is deviated in the left-right length, and fig. 10 (d) shows whether or not the size of the V-shaped mark is good in a good/bad determination chart. Fig. 10 (e) is a table showing the result of the quality determination based on the size of the V-shaped flag of the determination result display device.

The 8V-shaped flags were set to b1, b2, … … b8, respectively. The areas of the standard heart marks in the entire diamond image are denoted by A, and the areas of the V marks with respect to the diamond to be inspected are denoted by b1 to b8, whereby (b 1/A), (b 2/A), … … (b 7/A), and (b 8/A) were obtained. The threshold value is changeable. The grade A is acceptable when the grade is 0.13 or more and less than 0.25, the grade B is acceptable when the grade is 0.02 or more and less than 0.13 or 0.25 or more and less than 0.42, both acceptable and unacceptable are present, and the grade C is unacceptable when the grade is 0.00 or more and less than 0.02 or 0.42. The following is shown in the decision table: when 8 heart marks having a good V-mark size are present, the heart mark is determined to be acceptable, and if 1 heart mark belonging to the C region in the graph is present, the heart mark is determined to be unacceptable, whereas if 1 to 3 heart marks belonging to the B region in the graph are present, 4 or more heart marks are determined to be unacceptable.

Fig. 11 (a) to (c) are diagrams for judging whether or not the V-shaped marks of the diamond of the present invention have different horizontal lengths, and fig. 11 (d) shows a graph for judging whether or not the V-shaped marks have been judged. Fig. 11 (a) shows the spacing of the oblique side of a heart-shaped symbol from the V-shaped symbol located inside its heart-shaped symbol. Fig. 11 (b) is a diagram showing an example in which the front end portions of the V-shaped marks are equal in time. Fig. 11 (c) is a diagram showing an example of when the left and right front end portions of the V-shaped mark are uneven. The left length of the V-shaped mark is a, the right length of the V-shaped mark is B, and B/a = α. Fig. 11 (d) shows the quality of the left and right lengths of the V-shaped flag in a quality determination chart. Fig. 11 (e) is a table showing the result of the quality determination based on the left-right length of the V-shaped mark of the determination result display device. The range of the α value of 0.80 or more and less than 1.20 is defined as class a and is acceptable. The grade C is defined as a defective alpha value of 0.00 or more and less than 0.70 or 1.30 or more, and the grade B is defined as a range of 0.70 or more and less than 0.80 or 1.20 or more and less than 1.30. The following is shown in the decision table: when 8 heart marks having a good left-right length of the V-shaped mark are present, the heart mark is determined to be passed, and when 1 heart mark belonging to the C region in the graph is present, the heart mark belonging to the B region in the graph is passed, and when 1 to 3 heart marks are present, 4 or more heart marks are determined to be passed.

Fig. 12 (a) is a diagram for determining the quality of the symmetry (angle/length) of each hill of the diamond of the present invention, and fig. 12 (b) is a diagram for determining the quality of the symmetry of the hill in a quality determination chart. Fig. 12 (c) shows the quality of the hillock length in a quality determination chart.

Lines extending from the arrow tips of 8 humps toward the center are respectively set as B1, B2, B3, … … B8, angles between the humps are set as a1 (an angle between B1 and B2), a2, A3, … …, and A8, and a1-45= α 1 |, a2-45= |, A3-45= |, α 3 |, … …, a7-45= |, A8-45= |, α 8 |, are obtained. The greater the total agent Σ α agent of α 1 to α 8, the poorer the symmetry. The threshold value of | Σ β | is changeable. In the good/no-good determination table shown in fig. 12 (b), the good/no-good determination table is determined to be a good level a when the number is in the range of 0.00 or more and less than 6.20, and is determined to be a good level C when the number is 6.20 or more.

The maximum value of the length of the hill is Bmax, and the minimum value is Bmin. It can be said that the closer Bmax-Bmin is to 0, the more the hillock length is not deviated. In the determination of the variation in each hill length shown in fig. 12 (C), a range of 0.00 or more and less than 0.10 belonging to a in the graph is qualified as a rank a, and a range of 0.10 or more belonging to C in the graph is unqualified as a rank C.

Fig. 13 (a) is a graph showing the variation in the area of each hill of the diamond of the present invention. The variation in the area of the culm is described relative to the total area of the diamond. The areas of the respective hills on the circle indicated by the red line (black in the figure for convenience of drawing) are C1 to C8. The maximum value of the area of the hillock bit is Cmax, and the minimum value is Cmin. And set Cmax/Cmin = C. If the value of C is 1, the size is said to be not varied. If the C value is 1.00 or more and less than 1.34, the product is determined to be acceptable, and if the C value is 1.34 or more, the product is determined to be unacceptable.

Fig. 14 (a), (b), (c), (d), and (e) show the state of the deviation of the arrow of the cupule. The shift of the arrow for each cupule was evaluated as follows. If a virtual line connecting the tip a and the intersection b of each hill and a virtual line connecting the intersection b and the tip c are straight lines, it is determined that the hill is acceptable. If the angle formed by the imaginary line connecting the tip a and the intersection b and the imaginary line connecting the intersection b and the tip c is 1.5 degrees or more, the test piece is determined to be defective. Wherein a table top for setting a criterion for determining that the angle is 1.5 degrees is prepared, and the table top is changeable. In the angle determination, since the tip of the hill is not clear in many cases, a virtual line is drawn as shown in fig. 14 (e), and the angle formed by a dashed line bisecting the center line and a one-dot chain line is determined as a determination numerical value.

Fig. 15 (a), (b), and (c) are diagrams showing the sharpness of the tip of the arrow in each hill of the diamond of the present invention. As shown in the upper part of fig. 15 (b), each tip of the hill shown in fig. 15 (a) is acceptable in a state where the arrow tip is in sharp contact with the girdle. On the other hand, the lower side of fig. 15 (b) shows a state where the tip of the arrow of the hump bit contacts the girdle with a contact width. As shown in fig. 15 (c), the width of the arrow tip is B, B/a = α, and α is 0.32 or more, with respect to the width a of the hill. The threshold value of α is changeable.

FIGS. 16 (a), (b), (c), (d) and (e) are diagrams showing differences in light and shade of each of the hills of the diamond of the present invention photographed by a CCD camera. Fig. 16 (a) is a diagram showing a state where a portion of each hill showing a difference in brightness is formed on an oval circle. In fig. 16 (B) to (e), A, B, C, D in which the binarization of the qubit image is classified into 4 stages according to the brightness, where a is displayed in a completely white state, B is slightly gray state, C is quite gray state, and D is completely black state. In the determination table, the case where there are 8 hill images of the brightness a is passed, the case where there are 1 to 3 hill images of the brightness B is passed, and the case where there are 4 or more hill images is failed, and the case where there are 1 hill images C and D is determined to be failed.

FIG. 17 is an explanatory view showing a device for determining the quality of the heart & cupid optical effect of a diamond according to the present invention.

There are 2 types of means for obtaining heart & cupid images. One is a case where the diamond 1 to which the ID is added as the determination target is directly imaged by the CCD camera 7, and the other is a case where the heart & cupid image obtained from the pattern of the irradiated light is obtained by CG (computer graphics) reading data obtained by measuring the diamond 1 to which the ID is added by the size measuring device 5. The heart & cupid image obtained by real shooting or CG is stored in the computer database 8 together with the same ID as the target diamond 1. Based on each heart & cupid image managed by ID, each diamond is subjected to determination of grade a (pass), grade C (fail), and grade B (pass and fail according to the number of horizontal bars) by the determination result display device 10 via the arithmetic device 9 of the numerical value read in advance for each determination item.

Fig. 18 is a flowchart showing a method for determining the quality of the heart & cupid optical effect of the diamond according to the present invention. The heart & cupid images are suitable for either CG images or live-shot images. The heart & cupid images are read and subjected to arithmetic processing by the arithmetic device 9. The determination of the rank A, B, C was performed, and the rank A was good, the rank C was bad, and the rank B was good/bad according to the number of bars.

Industrial applicability

The present invention quantitatively, qualitatively and objectively judges the result of the quality judgment of a diamond in the gem industry, has a certain standard for quality evaluation, and can provide a safe transaction for transaction providers and consumers, thereby further improving the reliability of the transaction industry.

Claims (4)

1. A method for determining the quality of the heart & cupid optical effect of a diamond, comprising:

reading the size of the round brilliant cut diamond to which the ID is added by a size measuring device using a computer graphics CG (computer graphics) and outputting a heart & cupid image and the ID, or capturing the heart & cupid image of the diamond and outputting the ID by a CCD camera;

storing data of symmetry of 8 heart marks, variation of areas of the heart marks, offset of front end of each heart mark, depth of cut of each heart mark, ratio of width of right and left shoulders of each heart mark to the whole width, ratio of interval of boundary part of each heart mark and V mark positioned on inner side of the radial line to the whole width of each corresponding heart mark, ratio of area of each V mark to standard heart area, and ratio of right side length to left side length of the V mark in a computer database, and performing arithmetic processing on the data to determine whether the heart mark is good or not; and

and a step of storing data on the symmetry of the 8 hill marks, the degree of deviation obtained from the ratio of the maximum value to the minimum value of the area of each hill, whether a straight line connecting the outer tip of each hill and the center of the intersection of the center and the center of each hill overlaps, whether there is a deviation with an angle, whether the arrow tip of each hill sharply contacts the girdle or contacts the girdle with a contact width, in a computer database, and performing arithmetic processing on the data to determine the quality of the hill mark.

2. The method for determining the quality of heart & cupid optical effect of a diamond according to claim 1, wherein the first and second diamond are different from each other,

the method comprises a step of digitizing the symmetries of the heart mark and the hill mark, the offset of the shapes, and the offset of the distance between the heart mark and the V-shaped mark, reading the data by a computer, and performing a determination process by the computer to determine whether the image is good or not, and comprises 3 determination region mechanisms for determining whether the image is good or not, a non-good region, and a good or non-good region, or 2 determination region mechanisms for determining whether the image is good or not.

3. The method of determining the quality of the heart & cupid optical effect of a diamond according to claim 1 or 2, wherein the method is performed when the diamond is photographed by a CCD camera,

the method includes a step of reading the number of light and dark differences of the heart-shaped marker image and the hill-shaped marker image by a computer and performing a quality determination by a determination process by the computer.

4. A diamond heart & Cupid optical effect quality determination device, comprising:

a means for obtaining a heart & cupid image from a real image captured by a CCD camera, or a means for obtaining a heart & cupid image by reading, in CG, computer graphics, dimensions measured by a dimension measuring device for each part of a pattern of light irradiated to a diamond polished at a specific rate;

a mechanism for reading the same ID as that added to the diamond as a live shot image or a CG image;

means for storing the heart & cupid image in a computer database;

a computer arithmetic processing device for performing arithmetic operation based on the numerical value read from the computer database for each determination item based on each heart & cupid image managed by the ID; and

and a display means for judging whether the diamond is good or not based on the arithmetic processing.