JP5320536B2 - Diamond cut evaluation program and evaluation method - Google Patents

Diamond cut evaluation program and evaluation method Download PDF

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JP5320536B2
JP5320536B2 JP2011174270A JP2011174270A JP5320536B2 JP 5320536 B2 JP5320536 B2 JP 5320536B2 JP 2011174270 A JP2011174270 A JP 2011174270A JP 2011174270 A JP2011174270 A JP 2011174270A JP 5320536 B2 JP5320536 B2 JP 5320536B2
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明 小嶋
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明 小嶋
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a diamond cut evaluate program and a diamond cut evaluate method for outputting an objective reference to a cut evaluation by digitizing and visualizing a cut (shape) being one of four factors when evaluating a diamond as a jewelry. <P>SOLUTION: The diamond cut evaluate program and the diamond cut evaluate method is constituted by carrying out following steps. (A) a step for three-dimensionally measuring the shape of the diamond and obtaining three-dimensional shape data, (B) a step for restoring the shape from the obtained three-dimensional data and simulating an advancing passage of a light beam by irradiating a simulated light beam to the restored shape, (C) a step for evaluating the right and wrong of the diamond cut based of the simulation of the advancing passage of the simulated light beam, and (D) a step for outputting an evaluation result. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a diamond cut evaluation program and an evaluation method for quantifying and visualizing a cut (shape) which is one of four factors in evaluating diamond as a gemstone.

The value evaluation of diamond as a gem is determined by the following four criteria, and the price is determined by this evaluation.
(1) Carat ... Weight
(2) Color ... Color
(3) CLARITY: Transparency, presence of inclusions
(4) Cut (CUT): Shape after polishing Generally, these four evaluation criteria are collectively referred to as 4C. Each of the above four criteria will be briefly described below. Of the standards described below, standards other than carats are not standardized all over the world, but are typical evaluation standards generally used.

(1) Carat Carat is a unit of measurement for the weight of jewels including diamonds, and is 1.000 ct (ct is an abbreviation for carat), indicating 0.200 g. The weight of diamond used as a jewel has a width from 0.01 ct or less to 100 ct or more, but many have a weight from 0.05 ct to 1.0 ct.

(2) Color Color is judged to have high rarity value because it transmits light as it is nearly colorless. The color is judged by grading from D to Z in alphabetical order. In this rating, DEF refers to a colorless and transparent one, and GHIJ refers to a nearly colorless one. KLM refers to a faint yellow color, NR refers to a very light yellow color, and S to Z refers to a light yellow color.

(3) Clarity Clarity is determined by the size, position and number of wounds and inclusions. The highest is “FL (Flawless)”, and “IF (Internally Flawless)”, “VVS (Very Very Slightly) 1”, “VVS 2”, “VS (Very Slightly) 1”, “VS 2”, “SI (Slightly Included) 1” “SI2”, “I (Imperfection) 1”, “I2” and “I3” are evaluated in 11 stages.

  More specifically, “FL” refers to the extent to which no inclusion can be found inside or outside even if it is magnified 10 times, and “IF” is 10 times inside, although fine scratches are seen on the outside. The extent to which the inclusion cannot be found even if it is enlarged to. In addition, “VVS” refers to a case where it is very difficult to find an inclusion when it is magnified 10 times, and VS refers to a case where it is difficult to find an inclusion when it is magnified 10 times. “SI” means that the inclusion is relatively easy to find with a magnification of 10 times but is difficult with the naked eye, and “I” means the degree that the inclusion can be easily found with the naked eye.

(4) Cut The following evaluation methods are common for cuts.
[Evaluation Method 1] A method of measuring the dimensions of each diamond shape with a measuring instrument and evaluating how close to the ideal cut size ratio [Evaluation Method 2] Measure the dimensions of each part of the diamond with a measuring instrument. When recutting into an ideal brilliant cut, a method of deducting the weight of the portion to be cut off (see Fig. 12)

  Here, the diamond cutting will be described in more detail. At present, the brilliant cut is best known as the cut that theoretically found the most beautiful shining type. A brilliant-cut diamond is usually composed of a 58-hedron (a 57-hedron when the lower surface is not chamfered), and is composed of three parts: a crown, a girdle, and a pavilion as shown in FIG. The crown is the upper part of the stone and the upper part of the girdle. This is the part where you usually appreciate diamonds. The girdle is a portion that forms a thin boundary line that separates the top and bottom of the side of the stone. The diameter of the diamond is the inner circumference of the girdle. The pavilion is the lower part of the stone and below the girdle.

  The brilliant cut having such a configuration has the following characteristics. That is, in the brilliant cut, the light poured into the part above the diamond girdle is designed to return to the upper part of the diamond. (A) Light reflected from the surface of the diamond (reflected light) travels upward, and (b) Light incident on the diamond (refracted light) is refracted and internally reflected and emitted from above the diamond. And is designed to progress upwards. In the present specification, the amount of light emitted above the diamond is defined as “brightness”.

  Diamonds are basically viewed from above, and when used as accessories such as rings, the crown above the girdle is designed to be easily visible. Therefore, if the cut is bad, the light poured from above does not return upward but may escape to the lower part, and the “brightness” decreases accordingly. In other words, the purpose of the brilliant cut is to make the light poured from above as much as possible above the diamond to maximize the brightness of the gem.

  Of the evaluations based on the above four criteria, with regard to carat, color, and clarity, each of the current diamond weight, color, and transparency is evaluated. On the other hand, with regard to the evaluation of the cut, the evaluation method 1 does not evaluate how much the current diamond cut is shining, but there is a difference between the ideal cut and the cut It was just a matter of convenience. Evaluation method 2 also evaluated the possibility that the current diamond could be an ideal cut. In this way, all of them were hypothetical evaluations despite being important evaluations that should determine the “brightness” of diamond.

  Since general consumers usually do not have many opportunities to appreciate diamonds, when they purchase diamonds, they often purchase based on the credit of the seller. In buying and selling, trust in brands, retailers, and individual jewelers is of course important, but it goes without saying that objective and standardized evaluation methods that anyone can understand are also important.

  Therefore, the applicant has also studied an objective evaluation method for diamond cutting, and filed the following application as a result (see Patent Document 1). In this application, a virtual simulated light beam generated in a computer is incident on the upper part of the girdle having a cross-sectional shape of diamond, and after being refracted inside the diamond, it is determined from which part of the diamond the simulated light beam is emitted. A simulation method was proposed to evaluate diamond cuts based on the results.

More specifically, first, the cross-sectional shape of diamond is measured with a proportion scope. Next, the following simulation is performed on the cross-sectional shape by a computer.
(1) Generate logical simulated rays perpendicular to the girdle from above the cross-sectional shape.
(2) Simulate how the simulated rays travel after being incident on the cross-sectional shape.
(3) Of the simulated rays, the number of “brightness” when coming out from above the cross-sectional shape is regarded as the number of “brightness” when coming out downward.
Subsequently, N simulated rays are generated at equal intervals, and N ′ / N is determined as the cut evaluation if N ′ of these are bright. Finally, the cross-sectional shape of the diamond is measured from a plurality of directions, and the above simulation is performed using simulated rays. In this way, each result is comprehensively evaluated and a more rational evaluation is performed.

Japanese Patent Publication No.57-199944

  In the conventional evaluation method described above, since the quantification of the brightness is performed by measuring the cross section of the diamond in two dimensions, the following problems exist in the simulation. First, the simulation is based on the premise that light refraction and reflection proceed in the same cross section (two dimensions) until the light enters and exits the diamond. However, actual light travels in one of the three-dimensional directions when it is refracted and reflected inside the diamond.

  In addition, since diamond is not always cut into a perfect symmetrical shape, when measuring the cross-sectional shape, the cross-sectional shape differs depending on how it is fixed to the measuring instrument, and the simulation results change. Furthermore, actual light rays enter the diamond from all three-dimensional directions, but simulated light rays can be generated only in a plane (two-dimensional) in which the shape of the diamond is measured.

  From another point of view, diamonds do not always shine uniformly, but shine parts and non-shine parts coexist. The “brightness change” for each part makes people feel beauty as a whole. If one feels beauty in the “brightness” fixed by a person, the mirror that reflects 100% of the light should feel more beautiful than a jewel.

  In other words, when the diamond moves finely and changes its orientation and position, the diamond's light that reaches the viewer's eyes (hereinafter simply referred to as the eyes) As the brightness changes, the color of the light also changes. When white light (wavelength 3800 to 7800) enters the diamond, it is dispersed into colors such as red, orange, yellow, green, blue, and purple due to refraction. Such changes in the brightness of the light in each part and changes in the color of the light are elements that create the value of diamond. Here, this change in brightness and color is expressed as “blink”.

  The way of feeling the beauty of “sparkling” depends largely on the viewer's sensitivity, and is often evaluated in comparison with other diamonds. Jewelers who have many opportunities to come into contact with diamonds are also evaluated based on their experience. In addition, “blink” occurs due to a change in the relative positional relationship (three-dimensional) between the diamond and the eye of the viewer, so it is difficult to accurately restore or quantify the above. In the two-dimensional simulation by the conventional technique, it is difficult to restore the “whisker”.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and the object thereof is cut (shape) which is one of four factors in evaluating diamond as a gemstone. It is intended to provide a diamond cut evaluation program and an evaluation method for quantifying and visualizing) and outputting an objective standard for cut evaluation.

  In order to achieve the above object, the invention of claim 1 evaluates the quality of the diamond cut by virtually simulating using a computer how light is refracted or reflected in the three-dimensional shape of the diamond. In the diamond cut evaluation program, the program has a plurality of three-dimensional shape restoration functions for restoring the three-dimensional shape of the diamond to be evaluated into the memory and a crown portion of the restored diamond shape. A simulated light beam generation function for irradiating simulated light beams, a simulation function for simulating the paths of the plurality of simulated light beams according to the laws of reflection and refraction, and among the simulated simulated light beams, from the restored diamond crown portion Model released towards the top A simulated ray count function of counting the number of rays, characterized in that to realize a simulation result analyzing function of calculating the ratio of the number of the counted simulated light to the total simulated Rays irradiated. Moreover, this invention can also be grasped | ascertained as an invention of a diamond cut evaluation method as described in claim 9.

  In the above embodiment, it is not possible with the conventional two-dimensional simulation because it is possible to simulate the brightness of a diamond by irradiating it with simulated rays based on the three-dimensional shape of the diamond. This makes it possible to perform a reasonable and accurate simulation that matches the diamond shape.

  In addition, it is possible to provide an objective and rational cut evaluation method to the user by digitizing and outputting the quality of the cut in terms of brightness. In particular, the simulation result analysis function calculates how many of the simulated rays emitted in a predetermined pattern each return to the top of the girdle, and expresses this as a percentage, making it more objective and easier to understand. The result can be output.

  According to a second aspect of the present invention, in the first aspect of the invention, the program has a three-dimensional shape acquisition function for the computer to measure and acquire a three-dimensional shape of a diamond to be evaluated using a three-dimensional shape measuring instrument. It is characterized by realizing. Moreover, this invention can also be grasped | ascertained as an invention of a diamond cut evaluation method as described in claim 10.

  In the above aspect, the quality of diamond cutting can be read with a 3D shape measuring instrument such as a 3D digitizer, and the brightness can be simulated based on the 3D shape. Compared to the conventional 2D simulation. Thus, it is possible to perform an accurate simulation that matches the diamond shape.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the simulation function has a ratio of proceeding to the interior of the restored diamond and a ratio of reflecting on the restored diamond surface in the simulated light beam to be irradiated. When the angle of reversal according to the incident angle of the simulated light beam is set as the reversal angle, for each path of the plurality of simulated light beams, when the incident angle with respect to the restored diamond-shaped surface is equal to or greater than the reversal angle It is determined that the reflected diamond surface reflects, and when the incident angle is smaller than the reversal angle, it is determined to enter the restored diamond, and when it is determined to enter, Snell's law is used. Determine the direction in which the simulated light travels, and the angle of incidence with respect to the next abutting surface of the simulated light incident inside is the critical angle. If it is larger, it is determined that the light is totally reflected internally, and the process of determining the magnitude of the incident angle and the critical angle with respect to the next abutting surface is repeated while using the Snell's law again to determine the traveling direction of the simulated light beam. When the incident angle is equal to or less than the critical angle, it is determined that the reconstructed diamond is emitted from the inside to the outside without being totally reflected. Moreover, this invention can also be grasped | ascertained as an invention of a diamond cut evaluation method as described in claim 11.

  In the above embodiment, the simulation method of the path of the simulated light is changed between the case where it is reflected from the diamond surface and the case where it is refracted and enters the inside of the diamond at the reversal angle, and the path until each is emitted from the diamond. By performing the simulation, it is possible to accurately simulate the path of the simulated light beam.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the program causes the diamond to be evaluated to shine as the ratio calculated in the simulation result analysis function increases. It is characterized by realizing an evaluation function that evaluates as large. Moreover, this invention can also be grasped | ascertained as an invention of a diamond cut evaluation method as described in claim 12.

  In the above aspect, it is possible to provide an objective and rational cut evaluation method for the user by outputting the number of simulated rays to be emitted as to whether the cut is good or bad. In particular, the simulation result analysis function calculates how many of the simulated rays emitted in a predetermined pattern each return to the top of the girdle, and expresses this as a percentage, making it more objective and easier to understand. The result can be output.

  The invention of claim 5 is a diamond cut evaluation program for evaluating the quality of a diamond cut by virtually simulating using a computer how light is refracted or reflected in the three-dimensional shape of the diamond. This program virtualizes the three-dimensional shape restoration function for restoring the three-dimensional shape of the diamond to be evaluated into the memory and the position of the viewer's eye with respect to the restored diamond in the virtual area. A relative position setting function for setting the viewpoint and determining the relative positional relationship thereof, and the shape of the restored crown portion of the diamond viewed from the virtual viewpoint in the set positional relationship is projected in two dimensions. A crown shape creating means for specifying the two-dimensional shape as a projected crown shape, and the projection A reverse simulated light beam generation function for irradiating a plurality of simulated light beams from the viewpoint with respect to the round shape, a simulation function for simulating the respective paths of the plurality of simulated light beams by the law of reflection and refraction, and the simulated simulation A simulated simulated ray storage function for storing a simulated ray emitted toward the upper part from the restored crown portion of the diamond among the rays as a ray reaching the viewpoint from a ray incident from the restored crown portion of the diamond And realizing the above. Moreover, this invention can also be grasped | ascertained as an invention of a diamond cut evaluation method as described in claim 13.

  In the above embodiment, the viewpoint position of the diamond and the viewer is specified, the relative positional relationship between these is determined, and the shape of the crown portion of the diamond projected from the viewer's viewpoint, that is, the projection crown shape is simulated. Irradiate light. Here, when the opposite light is incident from the emission side to the incident side, the light beam proceeds in the same path as the light beam traveling from the incident side to the emission side. That is, if the path of the simulated light beam is irradiated from the viewpoint side toward the diamond, the path that is the same as the path through which the light incident from the upper part of the crown can reach the eye (viewpoint side) is obtained. Therefore, if the simulated light beam emitted from the viewpoint is emitted from the crown portion of the diamond, the simulated light beam enters the diamond from the outside and is emitted toward the viewpoint. This allows you to set multiple relative positional relationships between the diamond and the viewer's viewpoint, and by simulating them with simulated rays, which part shines and which part does not shine when viewed from a predetermined viewpoint Can be determined. Therefore, if this is displayed in such a manner that the viewpoint of the diamond can be changed on the display of the display means, etc., the degree of “shining” can be grasped by the difference in the way the diamond shines (brightness / color) for each viewpoint. Can do.

  According to a sixth aspect of the present invention, in the fifth aspect of the invention, the relative position setting function sets a plurality of relative positions of the restored diamond and the virtual viewpoint at predetermined intervals. The reverse simulated light beam generation function, the simulation function, and the arrival simulated light beam storage function are executed for each of a plurality of positions. Moreover, this invention can also be grasped | ascertained as an invention of a diamond cut evaluation method as described in claim 14.

  In the above aspect, by setting a plurality of relative positional relationships between the diamond and the viewer's viewpoint, and performing simulations with simulated rays, it is possible to change the viewpoint of the diamond on the display of the display means, for example. If displayed in a manner, the degree of “shining” can be ascertained by the difference in how diamonds shine (brightness and color).

  The invention according to claim 7 is the invention according to claim 5 or 6, wherein the reverse simulated light beam generation function includes a wavelength change function for changing the wavelength of the simulated light beam to be generated, and the wavelength change function is within a visible light range. A plurality of simulated light wavelengths are set, and the simulation function and the arrival simulated light storage function are executed for each of the plurality of wavelengths of the simulated light. Moreover, this invention can also be grasped | ascertained as an invention of a diamond cut evaluation method as described in claim 15.

  In the above aspect, since the visible light composed of 3800 to 7800 is naturally different in color and refractive index depending on the wavelength, the light incident from the viewpoint side depends on the wavelength from the lower side of the diamond crown. May be released. Therefore, by performing simulation for a plurality of wavelengths within a predetermined range, not only the brightness when viewed from the viewpoint side but also the color can be reproduced, and the sparkle due to the change in color can be reproduced.

  According to an eighth aspect of the present invention, in the invention according to any one of the fifth to seventh aspects, the program causes the computer to store the restored diamond crown as viewed from a virtual viewpoint in the relative position setting function. A crown area dividing function for dividing a partial area into a plurality of areas is realized, and the reverse simulated light ray generation function, the simulation function, and the arrival simulated light ray storage function are executed for each of the plurality of areas. To do. In addition, as described in claim 16, the present invention can also be understood as an invention of a diamond cut evaluation method.

  In the above aspect, the entire shape of the diamond and the crown portion of the diamond projected from the viewer's point of view is divided into a plurality of areas, and simulation of the path of the simulated light beam is performed for each area. The distribution becomes clearer and the diamond sparkle can be expressed in more detail.

  According to the present invention as described above, a cut (shape) which is one of four factors when evaluating diamond as a gemstone is quantified and visualized, and an objective standard for cut evaluation is output. A diamond cut evaluation program and an evaluation method can be provided.

The block diagram which concerns on the diamond cut evaluation program and evaluation method which concern on the 1st Embodiment of this invention. The schematic diagram which shows the simulated light beam pattern which concerns on the 1st Embodiment of this invention. The schematic diagram which shows the emission case of the simulated light beam which concerns on the 1st Embodiment of this invention. The block block diagram which concerns on the evaluation program and evaluation method of the diamond cut which concern on the 1st Embodiment of this invention. The flowchart figure which shows the outline | summary of the process which concerns on the diamond cut evaluation program and evaluation method which concern on the 1st Embodiment of this invention. The flowchart figure which shows the simulation process which concerns on the diamond cut evaluation program and evaluation method which concern on the 1st Embodiment of this invention. The schematic diagram which shows the concept of the evaluation program and evaluation method of the diamond cut which concern on the 2nd Embodiment of this invention. The block block diagram which concerns on the diamond cut evaluation program and evaluation method which concern on the 2nd Embodiment of this invention. The figure which shows the example of an output screen of the simulation result which concerns on the diamond cut evaluation program and evaluation method which concern on the 2nd Embodiment of this invention. The flowchart figure which shows the simulation process which concerns on the diamond cut evaluation program and evaluation method which concern on the 2nd Embodiment of this invention. The flowchart figure which shows the color calculation process which concerns on the diamond cut evaluation program and evaluation method which concern on the 2nd Embodiment of this invention. The figure which shows the image of the evaluation of the cut in the conventional diamond. The figure which shows the name of each part in the brilliant cut of a diamond. The figure which shows the relationship between the reflected light and the refracted light with respect to the incident angle of a diamond.

  Hereinafter, an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described with reference to the drawings. The diagram shown in FIG. 1 shows a virtual block configuration for causing a computer to execute the diamond cut evaluation program and the evaluation method according to the present embodiment, and a hardware configuration around it. Is. Further, description of the same configuration as the conventional one may be omitted as appropriate.

[1. First Embodiment]
(1) Outline of First Embodiment The diamond cut evaluation program and evaluation method according to this embodiment can be summarized by executing the following steps (a) to (d).
(A) Step of measuring the shape of the diamond in three dimensions and acquiring the three-dimensional shape data (A) Restoring the shape from the acquired three-dimensional shape data, and irradiating the restored shape with a simulated light beam (C) Step for evaluating the quality of diamond cut based on simulation of the path of simulated light (d) Step for outputting evaluation result Note that the evaluation here is mainly the result of simulation related to diamond cut. Is expressed numerically or quantified and presented as objective data.

  In the diamond cut evaluation program and evaluation method of the present embodiment, as described above, the shape measurement and shape data shape acquisition step, the simulation step for simulating a simulated light beam on the shape, and the evaluation step for evaluating the cut based on the simulation result This is composed of four steps of an output step for outputting this as objective data. Therefore, in the following, with respect to each step, the configuration of the computer to function and execute the evaluation method will be specifically described with reference to the block diagram of FIG.

(2) Configuration of each step (2-1) Diamond shape data acquisition step In order to implement the diamond cut evaluation method according to the present embodiment, the three-dimensional shape of the diamond to be evaluated is measured and digitized. It is necessary. In this step, the three-dimensional shape acquisition unit 21 using the three-dimensional shape measuring instrument 1 acquires position information of each surface (58 surfaces in the case of a brilliant cut) constituting the cut as three-dimensional data. Is.

  Here, a contact method and a non-contact method are generally known as methods for measuring the three-dimensional shape of an object. In most cases, the diamond to be measured of this embodiment is generally 0.05 ct to 1.0 ct, and its volume is as small as 1 cubic cm or less, so the non-contact method is suitable.

  As a non-contact type measuring instrument, a three-dimensional digitizer (also referred to as a 3D scanner) using a laser beam is widespread and can be used. As the three-dimensional digitizer, for example, “non-contact three-dimensional digitizer KONICA MINOLTA RANGE7” manufactured by Konica Minolta Sensing Co., Ltd., “high precision shape measurement system KS-1100 series” manufactured by Keyence Co., Ltd., or the like can be used. It is also possible to commercialize a digitizer specialized for measuring the shape of gemstones (ie, a dedicated product).

  However, since diamond has high transparency, the laser beam is transmitted without being reflected on the surface, and measurement is difficult as it is. Therefore, there are the following two methods for measuring transparent diamond with a three-dimensional digitizer using a laser beam.

  One is a method of measuring by applying a powder (thickness of several microns) that reflects laser light on the surface of a diamond to be measured. This method is performed when measuring a transparent object. In addition, when the diamond is covered with powder, an error of a few microns is generated, but the measurement error of the currently used jewel calipers (dimension measuring device) is 20 to 30 microns. The error of the degree is an acceptable range.

  The other is a method of taking the shape of a diamond to be measured and measuring the concave portion. This is an effective method for measuring an object having a large transparency. A known jewelry-type silicon rubber or the like can be used for the molding.

  The three-dimensional shape acquisition means 21 acquires the three-dimensional data input from the three-dimensional shape measuring instrument 1 for the three-dimensional shape data of the diamond to be read using the three-dimensional measuring instrument and the measuring method as described above. Store in the storage means 3. The storage means 3 includes both the meaning of a storage constituting auxiliary storage means such as a hard disk and the main memory for temporarily extracting and storing information. Therefore, the three-dimensional shape acquisition means 21 may temporarily store the three-dimensional shape in the main memory, read it by the CPU, and execute the process, or read it from the auxiliary storage device to the cache memory 24 and process it. May be executed. Hereinafter, in the case of a memory, these are used without distinction.

(2-2) Simulation Step Using Simulated Light When the three-dimensional shape of the diamond to be measured is acquired by the three-dimensional shape acquiring means 21, the simulated light is then applied to the acquired shape by the simulation means 22. Is generated and irradiated to simulate the path of the simulated light beam in the three-dimensional shape.

  Specifically, the simulation unit 22 reads the three-dimensional shape from the storage unit 3 and restores the three-dimensional shape restoration unit 221 that restores the shape in the memory, and the simulation condition designation unit 222 that sets the simulation conditions. Simulated ray generation means 223 for generating simulated rays for a three-dimensional shape, simulation execution means 224 for executing the simulated ray path simulation according to the generated simulated ray paths, and simulation results for analyzing the simulation results Analyzing means 225.

  Hereinafter, each of the three-dimensional shape restoration unit 221, the simulation condition designation unit 222, the simulated light beam generation unit 223, the simulation execution unit 224, and the simulation result analysis unit 225 will be described individually.

(2-2-1) Diamond Shape Restoration The three-dimensional shape restoration means 221 restores the diamond shape in the memory from the diamond three-dimensional shape data obtained by the three-dimensional shape acquisition means 21. In the following description, what is described as diamond refers to diamond restored in this memory.

  The three-dimensional shape restoring means 221 is a state in which the diamond is fixed with a girdle so that the table surface of the diamond is positioned above the girdle when generating and irradiating a simulated light ray in a simulated light ray generating means 223 described later. This is what restores.

  Although the shape restoration here shows that the entire shape of the diamond is read out for the convenience of explanation and the ease of the image and the whole shape is restored on the memory, this embodiment and the invention do not necessarily require the entire diamond. There is no need to carry out the method, and a method of reading and restoring the required surface according to the path of each ray in the simulation described later can also be employed.

(2-2-2) Designation of Simulation Conditions The simulation condition designating means 222 defines the following four conditions for simulated light rays when generating simulated light rays.
(1) Simulated ray generation pattern (2) Simulated ray characteristics (wavelength)
(3) Number of simulated light rays generated (N)
(4) Maximum number of total internal reflections (M)

  For the simulated light ray generation pattern (1), any one of simulation patterns 1 to 3 described later is selected. Regarding the simulated light characteristics of (2), since the bending rate varies depending on the wavelength of the light, it can be selected in the present embodiment, but here, as a simulated light, it is currently generally used for gem identification. A description will be given using a sodium D line having a wavelength of 5893 nm. The reason why the sodium D line is used as a simulated light beam is that the sodium D line is orange-yellow light, is close to a wavelength of 555 nm that is most easily visible to humans, and has the best visibility among all the light sources. This shows an optimum embodiment, and it is needless to say that simulation can be performed with other wavelengths.

  An arbitrary number is set for the number of simulated light rays generated in (3). That is, the diamond has various sizes, but in this embodiment, as described in detail later, the irradiation of the simulated light beam is performed at a predetermined uniform density regardless of the size in any of the patterns 1 to 3. To do. Therefore, the number of simulated light rays to be irradiated is calculated by selecting any one of patterns 1 to 3 and comparing it with the size of the diamond to be irradiated. For example, the density of 100 rays per square millimeter is set, and this is irradiated at the same density on the surface where the diamond abuts.

  In (4), it is assumed that the light beam enters the inside of the diamond and then reflects inside and stays inside the diamond. It is not appropriate to repeat this infinitely in the simulation, so the number of internal reflections is set to a predetermined number. When the number of reflections reaches the predetermined number, it is determined that the light ray remains inside the diamond. For example, the number of reflections is set to 1000 times, and the light beam that is reflected 1000 times or more inside the diamond is treated as staying inside.

(2-2-2) Generation of simulated light beam The simulated light beam generation unit 223 is a unit that generates a virtual simulated light beam for the diamond restored in the memory by the three-dimensional shape restoration unit 221. Here, as the simulated light beam, sodium D-line having a wavelength of 5893 mm is used as set under the above-described generation conditions.

  In the simulated light beam generation means 223, as described above, the diamond is fixed with the girdle so that the diamond table surface is located above the girdle, and the simulated light beam is incident from a portion (crown portion) above the girdle. (See FIG. 2).

On the premise of the above, three patterns shown in FIGS. 2A to 2C can be considered as typical simulated light beam generation examples in the simulated light beam generation means 223. In FIG. 2, for the sake of convenience, it is shown in two dimensions, but in actuality, it is executed in three dimensions.
[Pattern 1] The pattern is generated with a uniform density perpendicular to the upper part of the diamond fixing part (girdle) so that the diamond does not protrude (see FIG. 2A).
[Pattern 2] The pattern is generated with a uniform density in a range perpendicular to each surface from the outside with respect to each surface above the diamond girdle (see FIG. 2B).
[Pattern 3] The pattern 3 is generated with a uniform density in a range perpendicular to the table surface of the diamond and not protruding from the diamond (see FIG. 2C).

  Hereinafter, for any one, two, or all of these three patterns, the simulation execution means 224 executes the simulation in the following three cases: “diamond surface”, “inside diamond”, and “outside diamond”.

[Simulated ray path simulation 1] (reflection on diamond surface)
The simulation execution means 224 first determines whether the simulated light beam reflected from the diamond surface is based on the following two rules regarding the path after the simulated light beam generated outside the diamond reaches the diamond surface. ), The case is classified according to whether it is incident on the inside (refracted light).

(1) When the incident angle of the simulated light beam on the diamond surface is equal to or greater than a predetermined angle (82 °), the light emitted toward the diamond is not reflected inside the diamond and is treated as being reflected.

(2) When the incident angle of the simulated light beam on the diamond surface is smaller than a predetermined angle (82 °), the simulated light beam travels inside the diamond. The direction in which the simulated light beam travels at that time is according to the following Snell formula representing the relationship between the next incident angle r and the refraction angle s.
[Expression 1] sin r / sin s = refractive index (≈2.42)

  Regarding (1) above, the light applied to the diamond surface is divided into two. That is, one goes inside the diamond and the other reflects off the diamond surface. The amount of light entering the interior and the amount of reflected light vary depending on the incident angle. That is, when the incident angle becomes nearly vertical, most of the irradiated light passes through the surface of the diamond and travels inward. In this way, with respect to the light irradiated to the diamond, an angle at which the rate of proceeding into the diamond and the rate of reflection at the diamond surface is reversed according to the incident angle of the simulated light beam is defined as “reversal angle”, which is defined as 82 °. And set. When the incident angle of the simulated light beam with respect to the diamond surface is equal to or larger than the reversal angle, it is determined that the simulated light beam is reflected. Similarly, in (2), when the incident angle of the simulated light beam with respect to the diamond surface is smaller than the reversal angle, it is determined that the simulated light beam is incident on the inside of the diamond.

  Here, the angle of reversal was set to 82 °. The relationship between the reflected light and the refracted light with respect to the incident angle of the diamond is shown in FIG. "Publisher: National Jewelery Association, Release: Doyukan Co., Ltd., Date of issue: May 30, 1977, 112, 113 pages) When the incident light is 80 °, the reflected light is 43.44% and the refracted light is 56.67%. When the incident angle is 89 °, the reflected light is 89.97% and the refracted light is 10.03%. Between 80 ° and 89 °, the ratio of incident light and refracted light is reversed (see FIG. 14 (a)), and the angle is approximately 82 ° as shown in FIG. 14 (b). It depends.

  In the case of (2) above, the light is incident on the inside without being reflected by the diamond surface. Therefore, in the case of the above (2), the following simulation 2 is further performed.

[Simulated ray path simulation 2] (Inside the diamond)
In the case of the simulation 1 (2), the simulation execution means 224 is based on the above two rules (1) and (2) of the simulation 1 to determine the direction in which the simulated light beam incident on the diamond is reflected and refracted inside. And simulate.

  Then, for each case where each simulated light beam is emitted from the inside of the diamond to the outside, one of the following four is specified as shown in FIG.

[Case 1] From the top of the diamond girdle, it goes upwards with respect to the horizontal plane.
[Case 2] From the upper part of the diamond girdle, it goes downward with respect to the horizontal plane.
[Case 3] Go out from the bottom of the girdle.
[Case 4] As a result of the simulation, the simulated light beam undergoes total internal reflection inside the diamond and does not go out of the diamond.

  Here, the cases 1 to 4 will be described. The diamond is cut based on the purpose of “maximizing the shine as a jewel by causing light poured from above to travel as much as possible above the diamond”. Because it is a thing, the light which does not return to the upper part from the girdle does not become an element constituting the brightness. This is because the diamond is normally viewed from above the girdle surface, and n1 of the case 1 facing upward may be set to an effective brightness that reaches the viewer's eyes. Therefore, in evaluating the brightness in the following steps, it is assumed that only the case 1 that is emitted upward with respect to the horizontal plane is required as the brightness element.

[Sum of simulated rays]
The simulation result analyzing means 225 counts the number of simulated rays totally reflected on the diamond surface and the number of simulated rays emitted to the outside after entering the inside of the diamond. That is, the following numbers N and n1 to n4 are calculated and tabulated.

Total number of simulated rays generated: N
The number of simulated rays in case 1 is n1
The number of simulated rays in case 2 is n2.
The number of simulated rays in case 3 is n3
The number of simulated rays in case 4 is n4
As the total number of each.
Note that N = n1 + n2 + n3 + n4.

(2-3) Brightness Evaluation Step The evaluation means 23 is a means for executing the brightness evaluation based on the numbers N, n1 to n4 output by the simulation result analysis means 225 described above. The evaluation unit 23 includes a simulation result analysis unit 231 and an evaluation result output unit 232.

(2-3-1) Evaluation of brightness The simulation result analysis means 231 is a means for evaluating brightness at a ratio between the number of simulated light beams N analyzed by the simulation result analysis means 225 and n1 effective as brightness. Specifically, it is a means for evaluating that the greater the value of n1 / N, the greater the brightness.

  This evaluation in the simulation result analysis means 231 is performed for the purpose of the original cut, as described above, to “extend as much light as possible from above as far as possible above the diamond to maximize the shine as a gemstone”. It matches.

(2-3-2) Visualization of brightness characteristics (variation) The evaluation result output means 232 displays the result of the brightness evaluation calculated by the simulation result analysis means 231 as described above, the display means 4 such as a display, or a printer. It is a means for outputting to the output means 5 and visualizing.

  Diamonds as gemstones are not necessarily precise target shapes because each mined gemstone is polished into gemstones. That is, there are a bright portion and a dark portion. The evaluation result output means 232 is a means for visualizing the brightness characteristics.

  As a specific form of output, the evaluation result output means 232 includes all simulated rays totally reflected on the diamond surface and the paths (three-dimensional) of all simulated rays emitted from the diamond after traveling into the diamond. Plot on a planar image (2D).

  Further, as a method of the evaluation result output means 232, for example, as shown in FIG. 4, as a flat image, a map “cylindrical projection” (FIG. 4A) or “boat-shaped multi-conic projection” (FIG. 4B) is used. ) And other methods are used to express the brightness of light on a flat image. It is possible to express a portion where the plot is dense on the plane with a high brightness and a portion where the plot is sparse. This makes the inherent shine characteristics visible. At the same time, by displaying the ratio of the number of effective n (expressed as “emitted simulated light beam” or “emitted number” in the figure) as the number of simulated light beams N, the degree of brightness can be grasped numerically. I am doing so.

(3) Action of First Embodiment A procedure for executing the diamond cut evaluation program and the evaluation method of the present embodiment having the above-described configuration will be described.

(3-1) Outline of Action First, the flowchart of FIG. 5 shows an outline of the action of the diamond cut evaluation program and the evaluation method of the present embodiment. The three-dimensional shape acquisition means 21 reads the three-dimensional shape of diamond measured by the three-dimensional shape measuring instrument 1 and stores it in the storage means 3 (S501).

  Subsequently, the simulation unit 22 restores the three-dimensional diamond data acquired by the three-dimensional shape acquisition unit 21, irradiates the simulated light beam to simulate the course of the simulated light beam, and summarizes the results (S502). .

  Based on the simulation result, the evaluation unit 23 evaluates the simulation result (S503). Further, the evaluation unit 23 outputs the evaluation result to the display unit 4 such as a display and the output unit 5 such as a printing machine (S504).

(3-2) Details of Each Action Among the above-described processes, the simulated light simulation process in the simulation unit 22 and the subsequent process in the diamond cut evaluation unit 23 will be described in more detail.

  As shown in the flowchart of FIG. 6, the simulation unit 22 first restores the diamond shape in the memory from the three-dimensional shape data of the diamond obtained by the three-dimensional shape restoration unit 221. (S601). At this time, the three-dimensional shape restoring means 221 performs restoration in a state where the diamond is fixed with the girdle so that the diamond table surface is positioned above the girdle in the simulation in the simulated light ray generating means 223 in the next step.

  Subsequently, the simulation unit 22 irradiates the simulated three-dimensional shape with a simulated light beam and executes a simulation regarding the path of the simulated light beam (S602 to S620).

That is, first, the simulation condition designating means 222 defines the following four conditions for designating simulated rays when generating simulated rays (S602).
(1) Simulated ray generation pattern (2) Simulated ray characteristics (wavelength)
(3) Number of simulated light rays generated (N)
(4) Maximum number of total internal reflections (M)
In addition, said (1)-(4) uses the content demonstrated in the term of the structure.

  Further, the simulation condition designating unit 222 sets the number of simulated light rays to “0” as an initial value (S603), and further sets the number of simulated light rays to the current number (“0”) in order to execute subsequent simulation processing. It is set as “+1” (S604). Subsequently, the simulation condition designating unit 222 sets the count number M of the maximum number of total internal reflections as an initial value of 0 (S605).

  Next, the simulated light beam generation unit 223 first checks whether the simulated light beam generation number N is equal to the predetermined value determined by the simulation condition designating unit 222 (S606). At the start of the process, as described above, the number N of simulated light rays is set to 1, so the process proceeds to NO in S606 here.

  Based on this, the simulated light beam generation unit 223 generates a simulated light beam according to any one of the patterns 1 to 3 designated by the simulation condition designating unit 222 (S607).

  Subsequently, the simulation execution unit 224 executes a simulation process in S608 to S610. Specifically, in S608 to 610, the above simulated beam path simulation 1 is executed, and in S614 to S616, the above simulated beam path simulation 2 is executed.

[Simulated ray path simulation 1]
First, the simulation execution unit 224 determines whether the simulated light beam is reflected on the diamond surface or incident inside based on the incident angle of the simulated light beam generated by the simulated light beam generating unit 223 on the diamond surface (S608). That is, the simulation execution means 224 determines whether the incident angle of the simulated light beam on the diamond surface is equal to or greater than the reversal angle (82 °). If the simulated light beam angle is equal to or greater than the reversal angle (YES), the simulated light beam If it is determined that the light is reflected, the process proceeds to S609. On the other hand, if the incident angle of the simulated light beam is smaller than the reversal angle (NO), it is determined that the simulated light beam is incident on the inside of the diamond, and the process proceeds to S614 where the simulation 2 is executed.

  In step S609, the simulation execution unit 224 determines whether or not the simulated light beam is emitted above the girdle in order to determine the position and orientation of the simulated light beam emitted from the diamond (S609, see FIG. 3). .

  When the emission destination of the simulated light is upward from the girdle (YES), the process proceeds to S610, and it is further determined whether the simulated light is emitted upward from the girdle (S610). Here, if the simulated light beam is emitted upward (YES), the simulated light beam is counted as n1 as case 1 (S611, see FIG. 3). On the other hand, if the simulated light beam is emitted downward (NO), the simulated light beam is counted as n2 as case 2 (S612, see FIG. 3). After performing the case counting in S611, S612, and S613, the process is returned to S604, and this is repeated until the number N of simulated light rays generated reaches a predetermined value.

[Simulated ray path simulation 2]
On the other hand, if the incident angle of the simulated light beam is smaller than the reversal angle in S608 (NO), the simulated light path simulation 2 is executed by the simulation execution means 224 in S614.

  That is, the simulated light path simulation 2 simulates what path the simulated light incident on the inside of the diamond follows further inside. Here, in the same manner as in simulated beam path simulation 1, the simulated light beam incident on the inner surface has the incident angle of the simulated light beam on the inner surface of the diamond and the critical angle (≈24 ° 26 ′). The size is compared and judged (S614). If the incident angle of the simulated light beam on the inner surface of the diamond is larger than the critical angle, it will be totally reflected inside this time, so that the light will go back and forth inside. If the angle is less than the critical angle, it will be totally reflected. Without being released from the inside of the diamond.

  Therefore, if the incident angle of the simulated light beam is larger than the critical angle (YES in S614), the simulated light beam is totally reflected on the incident surface inside the diamond and again comes into contact with any surface inside. The maximum number of total internal reflections M is counted by “+1” (S615). Subsequently, it is determined whether or not the total number of internal reflections M has reached a predetermined maximum value (S616). If the total number of internal reflections M has reached, the simulated light beam is assumed to be a light beam that is reflected indefinitely inside the diamond. 4 is counted (S617, see FIG. 3).

  On the other hand, if the total number of internal reflections M has not reached the maximum value in S616 (NO in S16), the process returns to S614 to simulate the manner of reflection with respect to the inner surface of the diamond that the simulated light ray contacts next. .

  In S614, when the incident angle of the simulated light beam is equal to or smaller than the critical angle (NO in S614), the simulated light beam is emitted from the inside of the diamond to the outside of the diamond. Therefore, the process proceeds to S609 for the emitted simulated light beam. Then, whether the simulated light is emitted from the upper part of the girdle (S609) or whether it is emitted upward from the upper part of the girdle (S610) is examined, and cases 1 to 3 of S611 to S613 (FIG. 3). Classification).

  When simulated rays are emitted from the lower part of the girdle to the outside (NO in S609), the simulated rays are counted as n3 as case 3 (S613). On the other hand, when the simulated light beam is emitted from the top of the girdle (YES in S609) and when the light beam is emitted upward (YES in S610), the number is counted as n1 as case 1, and the light beam Is counted downward as case n2 (S612, see FIG. 3).

  After counting the path of simulated light in Cases 1 to 4 in S11, S12, S13, and S17, the process returns to S104, and the simulated light generator 223 sets the number N of simulated light beams to “+1”. The processes of S105 to S117 are repeated, and when the number N of simulated light rays reaches a predetermined upper limit value in S106, the count number of cases 1 to 4 is output in S118, and the process is terminated (END).

[Analysis of simulation results]
The simulation result analysis unit 225 calculates the following numbers N and n1 to n4 for the counts of the cases 1 to 4 counted by the processing of the simulation execution unit 224 as described above.
Total number of simulated rays generated: N
The number of simulated rays in case 1 is n1
The number of simulated rays in case 2 is n2.
The number of simulated rays in case 3 is n3
The number of simulated rays in case 4 is n4
Note that N = n1 + n2 + n3 + n4.
Thereby, the number of simulated rays totally reflected on the diamond surface and the number of simulated rays emitted to the outside after entering the inside of the diamond are tabulated.

  The evaluation unit 23 performs the brightness evaluation based on the numbers N, n1 to n4 output by the simulation result analysis unit 225 described above. Specifically, with respect to the ratio between the number of simulated light beams N analyzed by the simulation result analysis unit 231 and the effective n1 as the brightness, the greater the numerical value of n1 / N, the greater the brightness. evaluate.

  Subsequently, the evaluation result output unit 232 outputs the brightness evaluation result calculated by the simulation result analysis unit 231 as described above to the display unit 4 such as a display or the output unit 5 such as a printer for visualization. To do.

  According to the diamond cut evaluation program and evaluation method of the present embodiment as described above, the following effects can be obtained.

  Since the quality of diamond cuts can be read by a 3D shape measuring instrument 1 such as a 3D digitizer, and the brightness can be simulated based on the 3D shape, compared to the conventional 2D simulation. Accurate simulation that matches the diamond shape is possible.

  In addition, it is possible to provide an objective and rational cut evaluation method to the user by digitizing and outputting the quality of the cut in terms of brightness. In particular, the simulation result analysis means 231 calculates how many of the simulated rays emitted in a predetermined pattern each return to the upper part of the girdle, and expresses this as a ratio. Easy results can be output.

  Furthermore, by visualizing and displaying the evaluation result of the brightness on the display means 4 such as a display, when the diamond is moved on the screen, the color of the brightness can be confirmed on the screen. This makes it possible to provide an interface that makes it possible to visualize the brightness and easily determine the brightness.

By using such a diamond cut evaluation program and evaluation method, it is possible to make a comparison in terms of the absolute value of the brightness of the diamond. For example, when a simulated light beam having an equal density of 1000 dpi is poured vertically from above the diamond, it is possible to compare the absolute value of how many can be returned upward using 1 carat diamond and 0.5 carat diamond. The absolute values can be compared in the case of simulated light generation pattern 1 or pattern 3 in which simulated light is irradiated vertically from above the diamond as described above.
in this case,
(1) A diamond that returns 5000 simulated rays upward at 1 carat (2) When comparing two diamonds that return 6000 simulated rays upward at 0.5 carat, (2) shows that the carat is small The overall brightness from the gem is greater than (1). In this case, the selection between (1) and (2) varies depending on whether carat is important or brightness is important. Therefore, the diamond can be selected without depending on carats.

  In addition, by knowing the characteristics of how diamonds shine, it is easy to determine in which direction the diamonds are attached to decorative items such as rings. According to this, for example, it is possible to give an evaluation collateral to one's own empirical judgment for a jewelry designer (producer side).

[2. Second Embodiment]
The diamond cut evaluation program and evaluation method according to the second embodiment are improvements to the first embodiment, and instead of or in addition to the “shine simulation” in the first embodiment. , “Sparkling simulation” is executed. In this “blink simulation”, the processing in the step of measuring the three-dimensional shape and the step of restoring it are the same as those in the “brightness simulation” described above, so the description may be omitted in this section.

[Concept of brilliant step]
As described above, when a diamond is moved finely and its direction and position are changed, the brightness of light reaching the viewer's eyes from the diamond changes and the color of the light also changes. When white light (wavelength 3800 to 7800) enters the diamond, it is dispersed into colors such as red, orange, yellow, green, blue, and purple due to refraction.

  Changes in the brightness of the light and the change in the color of the light due to these points are also elements that create the value of diamonds. Therefore, in the present embodiment, an objective evaluation criterion for diamond is presented by quantifying and outputting the change in brightness and color as “blink” (brilliance).

[Overview of the process of sparkling step]
In the sparkling step, first, the shape is restored based on the measurement data of the three-dimensional shape. Subsequently, the viewpoint is set by simulating the position of the viewer's eyes. For example, as schematically shown in FIG. 7, the angle at which the viewer looks at the diamond is 30 degrees with respect to the girdle surface of the diamond, and the viewer's viewpoint is set at this position.

  Next, a simulated ray is generated from the set viewpoint. The path of the simulated light beam is simulated, and a light beam is emitted from the girdle surface above the girdle surface. Excludes those that remain below the girdle surface or inside the diamond. That is, if the light beam emitted upward from the girdle surface is traced in reverse, it can be said to be a light beam irradiated from above the girdle surface and can be said to be a light beam that reaches the viewer's eyes.

  This simulated light beam determines a predetermined interval between wavelengths 3800 to 7800 and repeats the course simulation for a predetermined number at this predetermined interval. This is because the refractive index varies depending on the wavelength of the light, and whether the light that is traced back from the eye depending on the wavelength is properly incident on the diamond (from the top of the girdle of the diamond) is confirmed for each wavelength. It is necessary.

  As described above, the simulated light beam is emitted from the set predetermined viewpoint, and the course is simulated with respect to a plurality of wavelengths, so that it is determined which wavelength of light is appropriately incident on the diamond with respect to the viewpoint. In accordance with this, the dispersion of light is achieved by restoring the light that reaches the viewpoint to each of the plots by schematically assigning the corresponding color to each of the plots and rotating it on an output device such as a display. Can simulate diamond whirling.

[Means to execute the sparkling step]
The sparkling step in the present embodiment is executed by the sparkling simulation means 25 as shown in FIG. Specifically, the sparkling simulation means 25 reads the three-dimensional shape from the storage means 3 and determines the relative positional relationship between the viewer's eyes and diamond, and the three-dimensional shape restoration means 251 for restoring the shape in the memory. Condition setting means 252 for setting conditions, and relative position setting means 253 for setting the viewer's viewpoint and the relative position of the diamond based on the conditions set by the condition setting means 252.

  Further, the glittering simulation means 25 includes a crown shape creation means 254 for creating a two-dimensional shape when the crown portion of the diamond is viewed from the viewer's viewpoint, and a crown region for dividing the two-dimensional shape area of the crown portion into dots. Dividing means 255.

  The sparkling simulation means 25 also assigns an order to the areas divided by the crown shape creation means 254 and manages the number and order of the areas to be simulated. In the area setting means 256, the crown shape b Color calculation executing means 257 for executing color calculation on the crown-shaped predetermined region inputted as a color output means 258 for outputting the color of the area determined by the color calculation executing means 257 on the display unit; Is provided.

  Similar to the first embodiment, the three-dimensional shape restoration unit 221 restores the shape of the diamond in the memory from the three-dimensional shape data of the diamond obtained by the three-dimensional shape acquisition unit 21.

The condition setting means 252 is a means for setting conditions for determining the relative positional relationship between the viewer's eyes and diamond. The following (1) to (4) are assumed as the relative positional relationship. In addition, all the numbers shown below can be arbitrarily determined, and only an example is shown below.
(1) Position relationship change pattern (diamond rotation amount, etc.)
(2) Position relationship change amount (3) Wavelength interval: D (Å)
(4) Crown shape division number B (= 0 to b to B)

  The relative positional relationship between the viewer's eyes and the diamond is determined based on the positional relationship change patterns (1) and (2) and the positional relationship change amount. A plurality of relative positional relationships are provided as positional relationship 1, positional relationship 2,..., Positional relationship a,.

  For example, assuming that the positional relationship change pattern is a diamond rotation, and a 360 ° rotation is performed every 0.5 °, there are 720 positional relationship change amounts per rotation. In addition, if the positional relationship change pattern is such that the position of the viewpoint with respect to the diamond is from the girdle and the horizontal position 0 ° to the vertical position 90 ° with respect to the girdle, and this is changed every 1 °, , There are 90 ways. In this case, the positional relationship change pattern A is 720 × 90 = 64800. Therefore, the positional relationship change pattern A is 1 to 64800.

  The wavelength interval D (Å) in (3) is set between 3800Å (purple) and 7800Å (red). Therefore, the change amount of the wavelength C from 3800 to 7800 is divided into c, the minimum value [wavelength 0] = 3800 Å, the maximum value [wavelength C] = 7800 、, wavelength 0, wavelength 1, wavelength 2,. (C represents the number of wavelength patterns).

  When [wavelength c] − [wavelength c−1] = [constant value D] and an arbitrary variable is set in D, it can be determined as arbitrary [wavelength c] = (3800 + Dc) D. The variable D can be changed in design. In this embodiment, when D = 10, the wavelength c is 0 to 400.

  The crown shape division number B in (4) refers to the number of the case where the plane is divided into dots when the shape of the diamond above the girdle as viewed from the viewer's viewpoint is projected in two dimensions. . In this case, as shown in FIG. 9, it is projected in a substantially elliptical shape with the girdle of diamond as the center. Therefore, the division number B can be varied according to the number of pixels of the display used for the display means 4. For example, in the case of a screen of 1280 × 1024 pixels, the planar shape of the diamond is changed in the horizontal direction. Assuming that it is projected in the range of about one-third and a half of the horizontal direction, 640 × 320 = 204800 pixels, that is, the division number B is 204800.

  The relative position setting means 253 is a means for setting the position as the viewer's viewpoint and managing the progress of the pattern number A of the relative positional relationship between the diamond and the viewer's viewpoint. That is, the relative position setting unit 253 resets the positional relationship pattern number A at the start of the process of the blinking step, and thereafter, for each of the above-mentioned 64800 positional relationships, the relative position setting unit 253 determines the positional relationship every time the color calculation process described later is executed. One is updated, and finally, it is a means for determining whether or not the number of a, which is the number of positional relationship patterns, has reached the maximum value 64800.

  The crown shape creating means 254 projects the shape of the crown portion of the diamond that can be seen from the viewer's viewpoint in a two-dimensional manner in a, which is a relative positional relationship between the diamond and the viewer's viewpoint, and schematically represents this. Means. That is, as shown in the schematic diagram of FIG. 9, a two-dimensional shape (referred to as “projection crown shape”) in which diamond is viewed is created from the position specified as the positional relationship a.

  The crown region dividing unit 255 is a unit that divides the two-dimensional projected crown shape created by the crown shape creating unit 254 into B areas according to the crown shape division number B described above. Here, as described above, the crown shape division number B is a predetermined number of planes when the shape of the diamond on the top of the girdle as viewed from the viewer's viewpoint is regarded as a projected crown shape on two dimensions (plane). The number when divided into areas.

  The region setting unit 256 is a unit that assigns an order to each of the areas divided by the crown shape creation unit 254 and manages the number and order of the areas to be simulated. That is, as a specific process, the region setting unit 256 initializes the number of crown shape patterns B in order to manage the number of areas of the crown to be simulated at the beginning of the simulation, and thereafter, the number B The predetermined area b is input to the color calculation execution means 257. The area setting unit 256 sequentially executes the simulation for the area b, determines whether the number of the areas b has reached the maximum value, that is, whether the color calculation is completed for all the projected crown shapes, and ends. If so, this is input to the color output means 258.

  The color calculation execution unit 257 is a unit that executes color calculation for each of a plurality of crown-shaped predetermined regions input as the area b in the region setting unit 256. In other words, the color calculation execution unit 257 executes a simulation about the direction in which the diamond is irradiated from a set viewpoint with respect to the wavelength c of a plurality of patterns in the range of 3800 to 7800 which is the visible light wavelength range. Means.

  The method for determining a plurality of patterns of the wavelength c is as described above, and the color calculation execution unit 257 multiplies the wavelength c by the number of wavelengths c to the set wavelength interval D by 3800 mm which is the reference value. It is set as (3800 + Dc) Å which added together. When D = 10, c is 0 to 400, and the color calculation execution unit 257 executes this wavelength c 400 times.

  Further, the color calculation execution means 257 determines whether or not the light beam at the wavelength c is emitted from the upper part of the girdle as a result of the simulation, and if it is emitted from the upper part of the girdle, this is stored in the storage means 5. It is stored in a table.

  Further, the color calculation execution unit 257 determines that there is no light ray incident on the girdle surface from the outside and emitted to the crown-shaped region b when the wavelength c in each area is zero. To do. If it is determined that the number of wavelengths c is one, the color of area b is determined to be a single color of wavelength c. Further, when it is determined that there is not one, the color of the area b is determined to be a plurality of colors in the table, and the color of the light beam is input to the color output means 258.

  The color output unit 258 determines whether the color output of the area b is a combination of a plurality of colors, a single color, or a colorless color. The output means 5 outputs it.

[Details of the sparkling step process]
Next, the process flow of the sparkling step will be described in detail with reference to the flowchart of FIG.
In the sparkling step, first, the shape of the diamond is restored in the memory from the three-dimensional shape data acquired by the three-dimensional shape acquisition means 21 by the three-dimensional shape restoration means 221 (S1001).

  Subsequently, the condition setting unit 252 includes (1) a positional relationship change pattern, (2) a positional relationship change amount, (3) a wavelength interval: D (Å), and (4) a crown shape division number B (= 0 to b to Four of B) are set (S1002).

  Subsequently, the relative position setting unit 253 sets a position to be the viewer's viewpoint based on the criteria (1) and (2) set by the condition setting unit 252 (S1003 to S1005). Specifically, the relative position setting unit 253 first sets the initial value a = 0 to reset the positional relationship a (S1003). Next, in order to update one positional relationship, the positional relationship a = a + 1 is set (S1004). Then, it is determined whether or not the number of positional relationships a has reached a predetermined maximum value (64800 in this embodiment) (S1005).

  When the positional relationship a has not reached the maximum value (NO in S1005), the relative position setting unit 253 sets the positional relationship a on the memory (S1006).

  Next, the crown shape creating means 254 creates a projected crown shape in the positional relationship a (S1007). That is, as shown in the schematic diagram of FIG. 9, a two-dimensional shape in which the diamond is viewed is created from the position specified as the positional relationship a. The crown region dividing unit 255 divides the two-dimensional projected crown shape into B areas according to the above-described crown shape division number B.

  Subsequently, the region setting means 256 initializes the number b of the crown shapes and sets b = 0 in order to perform simulation by irradiating each of the projected crown shapes with simulated light rays (S1009). . Then, in the next step, the region setting means 256 adds b to one to obtain b = b + 1 in order to execute the crown shape b in order (S1010). At this stage, it is determined whether or not the number of crown shapes b has reached the maximum value B (S1011).

  If the area setting means 256 determines that the plurality of areas b have not reached the maximum value (NO), the color calculation executing means 257 executes color calculation in the current area b ( S1013). This color calculation will be described later using a flowchart.

  When the color calculation execution unit 257 calculates the color in the area b, the color of the area b is stored in the storage unit 3 (S1014). When the glitter simulation unit 25 stores the color of the area b, the process returns to S110, and the region setting unit 256 sets the crown shape b to b + 1 again (S1010), and whether or not the crown shape b has reached the maximum value B. Is determined (S1011). If the area setting means 256 determines that the crown shape b has not reached the maximum value, the color of the area b incremented by 1 is calculated and stored (S1013, S1014), and the process returns to S1010.

  On the other hand, when the crown shape b reaches the maximum value in the region setting means 256, the colored crown shape in the positional relationship a is stored (S1012), the process returns to S105, and the positional relationship a = A. If the positional relationship a = A is not satisfied (NO), the processing after S1006 is executed. If the positional relationship a = A is satisfied (YES in S1005), the process proceeds to S1015. The colored crown shapes in relations 1 to A are output to the output means 5 or the display means 4 and the process is terminated (END).

  Here, with reference to FIG. 11, the flow of color calculation processing in the color calculation execution means 257 will be described. In the color calculation, light is sequentially generated in the crown shape b at the wavelength interval D (間隔) set in S1002 of FIG.

  As shown in FIG. 11, first, the color calculation execution unit 257 defines that the wavelength c = −1 in order to initialize the number of times of the wavelength c (S1101). Subsequently, the color calculation execution unit 257 updates the number of times of the wavelength c and sets the wavelength c = c + 1 (S1102). At the start of the color calculation process, the number of wavelengths c is zero.

  Next, the color calculation execution unit 257 determines the wavelength of the wavelength c. That is, the wavelength c is set as (3800 + Dc) Å, which is obtained by multiplying the reference value 3800 波長 by the set wavelength interval D and the number of wavelengths c.

  Subsequently, the color calculation execution unit 257 determines whether or not the wavelength c = (3800 + Dc) Å has reached the maximum value of 7800Å (S1104), and if not, proceeds to S1105 and proceeds to the wavelength c. Calculate the refractive index of diamond at, and perform ray simulation. Then, the color calculation execution unit 257 determines whether the light beam at the wavelength c is emitted from the upper part of the girdle as a result of the simulation (S1106). If it is released above the girdle, this is stored in the table (S1107), and the process proceeds to S1102 to repeat the above processing.

  On the other hand, when the wavelength c reaches 7800 mm in S1104 and the color calculation has been completed for all wavelengths (YES), the color calculation execution unit 257 counts the number of wavelengths c stored in the table in S1107. In the case of 0, there is no light ray incident on the crown-shaped region b from the outside above the girdle surface and emitted to the crown-shaped region b. In step S1112, the area b is processed as having no color.

  In S1108, when the color calculation execution unit 257 determines that the number of wavelengths c is not 0 (NO), it subsequently determines whether the number of wavelengths c is 1, and determines that it is not 1 (NO), it is determined that the color of the area b is a plurality of colors in the table (S1110). On the other hand, when the number of wavelengths c is one, the color calculation execution unit 257 determines that the color of the area b is a single color of the wavelength c in S1111 (S1111).

  Based on the above processing, the color output means 258 outputs the color output of the area b on the display shown in FIG. 9 as to whether the color of the area b is a combination of a plurality of colors, a single color, or a colorless color ( In step S1113, the process ends (END).

  According to the diamond cut evaluation program and evaluation method of the present embodiment as described above, the following effects can be obtained.

  The viewpoint position of the diamond and the viewer is specified, the relative positional relationship between these is determined, and a simulated light beam is irradiated from the viewpoint side toward the diamond. In this case, if the simulated light beam emitted from the viewpoint is emitted from the crown portion of the diamond, the simulated light beam enters the diamond from the outside and is emitted toward the viewpoint. This allows you to set multiple relative positional relationships between the diamond and the viewer's viewpoint, and by simulating them with simulated rays, which part shines and which part does not shine when viewed from a predetermined viewpoint Can be determined. Therefore, if this is displayed in a mode in which the viewpoint of the diamond can be changed on the display of the display means or the like, the degree of “shining” can be grasped by the difference in the way the diamond shines (brightness / color).

  Naturally, visible light composed of 3800 mm to 7800 mm has different color and refractive index depending on the wavelength, so that light incident from the viewpoint side may be emitted from the lower side of the diamond crown depending on the wavelength. is there. Therefore, by performing simulation for a plurality of wavelengths within a predetermined range, not only the brightness when viewed from the viewpoint side but also the color can be reproduced, and the sparkle due to the change in color can be reproduced.

  By dividing the entire shape of the diamond crown from the viewpoint of the diamond and the viewer into multiple areas and performing simulated light path simulation for each area, the distribution of the light emitted from the diamond can be found in more detail. It will be possible to express the sparkle of diamonds in more detail.

[3. Other Embodiments]
The present invention is not limited to the contents shown in the above embodiment, and includes, for example, the following aspects. For example, in the present invention, as an application example, it is possible to simulate an optimal recutting method for a cut diamond. By making it possible to process and modify the diamond cut that is output on the screen, it is possible to grasp where and how much it is cut and how the brightness changes. In addition, depending on the case, the application range is wide. Furthermore, when designing a new cut, it can be judged whether the cut is good or bad.

  In the first embodiment, as [simulated ray path simulation 1], it is determined whether the simulated ray generated outside the diamond is reflected on the diamond surface (reflected light) or incident on the inside (refracted light). The angle at which the rate of proceeding to the inside of the diamond and the rate of reflection at the diamond surface are reversed according to the incident angle of the simulated light beam is defined as “reversal angle” (82 °). In each case, it was judged whether it was reflected or incident.

  In this regard, as described above, the amount of reflected light and the amount of refracted light gradually change depending on the incident angle in the simulated light beam applied to the diamond surface. Therefore, in the present invention, the ratio of the reflected light and the ratio of the refracted light with respect to one irradiated light is not selected, as in the above embodiment, whether the simulated light beam is reflected or incident. It is also possible to simulate how the light for each proportion travels thereafter.

  More specifically, in the flowchart shown in FIG. 6, in the first embodiment, in S <b> 608, the incident angle of the simulated light beam applied to the diamond surface is greater than or equal to the reversal angle (YES) or smaller than the reversal angle. Kana (NO) was one of two choices. For example, when the angle of the simulated light beam applied to the diamond surface is 40 °, the ratio of reflected light is 17.73% and the ratio of refracted light is 82.27% as shown in FIG. Therefore, in S608 of FIG. 6, 17.73% of light is input to the S609 side, 82.27% of light is input to the S614 side, and the following processing is performed as light of this ratio, respectively. By doing so, a more accurate simulation can be performed.

  Further, in the first embodiment, as [simulated ray path simulation 2], the incident angle and the critical angle (≈24 °) of the simulated ray with respect to the inner surface of the diamond with respect to the surface where the simulated ray incident on the inside comes into contact next. 26 '), the total reflection is made when the incident angle of the simulated light beam on the inner surface of the diamond is larger than the critical angle. When the incident angle is less than the critical angle, the reflection is not totally reflected from the inside of the diamond. Judged to be released to the outside.

  In this respect, as in the case of [simulated ray path simulation 1], even in the case of total reflection, the refracted light is not zero, and reflection and refraction occur simultaneously. Therefore, in the present invention, even in [Simulated ray path simulation 2], the simulated light is either totally reflected or not totally reflected and emitted from the inside of the diamond to the outside. It is also possible to multiply the ratio of the reflected light and the ratio of the refracted light to simulate how the light for each ratio proceeds thereafter.

DESCRIPTION OF SYMBOLS 1 ... Three-dimensional shape measuring instrument 2 ... Main CPU and its peripheral circuit 21 ... Three-dimensional shape acquisition means 22 ... Simulation means 221 ... Three-dimensional shape restoration means 222 ... Simulation condition designation means 223 ... Simulated ray generation means 224 ... Simulation execution means 225 ... Simulation result analysis means 23 ... Evaluation means 231 ... Simulation result evaluation means 232 ... Evaluation result output means 24 ... Cache memory 25 ... Sparkling simulation means 251 ... Three-dimensional shape restoration means 252 ... Condition setting means 253 ... Relative position setting means 254 ... Crown shape creating means 255 ... Crown area dividing means 256 ... Area setting means 257 ... Color calculation executing means 258 ... Color output means 3 ... Storage means 4 ... Display means 5 ... Output means

Claims (16)

  1. In a diamond cutting evaluation program that evaluates the quality of diamond cutting by virtually simulating using a computer how light is refracted or reflected in the three-dimensional shape of diamond,
    This program is stored in the computer
    A three-dimensional shape restoration function for restoring the three-dimensional shape of the diamond to be evaluated into a memory;
    A simulated light beam generation function for irradiating a plurality of simulated light beams on the restored diamond-shaped crown portion,
    A simulation function for simulating the path of each of the plurality of simulated rays according to the laws of reflection and refraction;
    Among the simulated light rays simulated, a simulated light ray counting function for counting the number of simulated light rays emitted toward the upper part from the restored crown portion of the diamond,
    A simulation result analysis function for calculating the ratio of the number of simulated light beams to the total number of simulated light beams irradiated;
    Diamond cut evaluation program characterized by realizing
  2. The program is stored in the computer.
    2. The diamond cut evaluation program according to claim 1, wherein a three-dimensional shape acquisition function for measuring and acquiring a three-dimensional shape of a diamond to be evaluated by a three-dimensional shape measuring instrument is realized.
  3. The simulation function is
    In the simulated simulated light to be irradiated, the ratio of proceeding to the inside of the restored diamond and the ratio of reflection on the restored diamond surface when the angle of reversal according to the incident angle of the simulated light is the reversal angle,
    For each of the paths of the plurality of simulated rays, when the incident angle with respect to the restored diamond-shaped surface is greater than or equal to the reversal angle, it is determined that the reflected light is reflected by the restored diamond surface, and the incident angle is smaller than the reversal angle. In that case, it is determined that the inside of the restored diamond has entered,
    If you decide to enter, use Snell's law to determine the direction in which the simulated ray travels,
    Further, if the incident angle with respect to the next abutting surface of the simulated light beam incident on the inside is larger than the critical angle, it is determined that the light is totally reflected inside, and Snell's law is used again to determine the traveling direction of the simulated light beam. In addition, the process of determining the incident angle and the critical angle with respect to the next abutting surface is repeated. When the incident angle is equal to or smaller than the critical angle, it is emitted from the inside of the restored diamond without being totally reflected. The diamond cut evaluation program according to claim 1 or 2, characterized in that
  4. The program is stored in the computer.
    The diamond cut according to any one of claims 1 to 3, wherein an evaluation function that evaluates that the brightness of the diamond to be evaluated is greater as the ratio calculated in the simulation result analysis function is larger is achieved. Evaluation program.
  5. In a diamond cutting evaluation program that evaluates the quality of diamond cutting by virtually simulating using a computer how light is refracted or reflected in the three-dimensional shape of diamond,
    This program is stored in the computer
    A three-dimensional shape restoration function for restoring the three-dimensional shape of the diamond to be evaluated into a memory;
    In a virtual region, a relative position setting function for setting a viewpoint that virtualizes the position of the viewer's eyes with respect to the restored diamond, and determining the relative positional relationship between them,
    A crown shape creation function for projecting the shape of the crown portion of the restored diamond viewed from the virtual viewpoint in a two-dimensional manner in the set positional relationship, and specifying the two-dimensional shape as a projected crown shape;
    A reverse simulated light beam generation function for irradiating a plurality of simulated light beams from the viewpoint with respect to the projected crown shape,
    A simulation function for simulating the path of each of the plurality of simulated rays according to the laws of reflection and refraction;
    Of the simulated simulated light rays, the simulated light rays emitted toward the upper part from the restored crown portion of the diamond are stored as light rays incident from the restored diamond crown portion reach the viewpoint. Simulated light storage function,
    Diamond cut evaluation program characterized by realizing
  6. The relative position setting function sets a plurality of relative positions of the restored diamond and the virtual viewpoint at a predetermined interval.
    6. The diamond cut evaluation program according to claim 5, wherein the reverse simulated light beam generation function, the simulation function, and the arrival simulated light beam storage function are executed for each of the plurality of positions.
  7. The reverse simulated light beam generation function includes a wavelength change function for changing the wavelength of the simulated light beam to be generated,
    This wavelength change function is to set multiple simulated light wavelengths in the visible light range,
    The diamond cut evaluation program according to claim 5 or 6, wherein the simulation function and the arrival simulated light storage function are executed for each of the plurality of wavelengths of the simulated light.
  8. The program is stored in the computer.
    In view of a virtual viewpoint in the relative position setting function, to realize a crown area dividing function for dividing the restored crown part area of the diamond into a plurality of areas,
    The diamond cut evaluation program according to any one of claims 5 to 7, wherein the reverse simulated light beam generation function, the simulation function, and the arrival simulated light beam storage function are executed for each of the plurality of areas.
  9. In a diamond cut evaluation method for evaluating the quality of diamond cut by virtually simulating using a computer how light is refracted or reflected in the three-dimensional shape of diamond,
    The computer
    A three-dimensional shape restoration step for restoring the three-dimensional shape of the diamond to be evaluated into a memory;
    A simulated light beam generating step of irradiating a plurality of simulated light beams on the restored diamond-shaped crown portion,
    A simulation step of simulating the path of each of the plurality of simulated rays according to the laws of reflection and refraction;
    Among the simulated light rays simulated, a simulated light ray counting step for counting the number of simulated light rays emitted toward the upper part from the restored crown portion of the diamond,
    A simulation result analysis step of calculating a ratio of the number of simulated light beams to the total number of simulated light beams irradiated;
    The diamond cut evaluation method is characterized in that the steps are sequentially executed.
  10.   The diamond cut evaluation method according to claim 9, further comprising a three-dimensional shape acquisition step of measuring and acquiring a three-dimensional shape of the diamond to be evaluated by a three-dimensional shape measuring instrument.
  11. In the simulation step,
    In the simulated simulated light to be irradiated, the ratio of proceeding to the inside of the restored diamond and the ratio of reflection on the restored diamond surface when the angle of reversal according to the incident angle of the simulated light is the reversal angle,
    For each of the paths of the plurality of simulated rays, when the incident angle with respect to the restored diamond-shaped surface is greater than or equal to the reversal angle, it is determined that the reflected light is reflected by the restored diamond surface, and the incident angle is smaller than the reversal angle. In that case, it is determined that the inside of the restored diamond has entered,
    If you decide to enter, use Snell's law to determine the direction in which the simulated ray travels,
    Further, if the incident angle with respect to the next abutting surface of the simulated light beam incident on the inside is larger than the critical angle, it is determined that the light is totally reflected inside, and Snell's law is used again to determine the traveling direction of the simulated light beam. In addition, the process of determining the incident angle and the critical angle with respect to the next abutting surface is repeated. When the incident angle is equal to or smaller than the critical angle, it is emitted from the inside of the restored diamond without being totally reflected. The diamond cut evaluation method according to claim 9 or 10, characterized in that:
  12.   The diamond cut according to any one of claims 9 to 11, further comprising an evaluation step of evaluating that the diamond calculated as the evaluation object has a higher brightness as the ratio calculated in the simulation result analysis step is larger. Evaluation method.
  13. In a diamond cut evaluation method for evaluating the quality of diamond cut by virtually simulating using a computer how light is refracted or reflected in the three-dimensional shape of diamond,
    The computer
    A three-dimensional shape restoration step for restoring the three-dimensional shape of the diamond to be evaluated into a memory;
    A relative position setting step for setting a viewpoint in which the position of the viewer's eye is virtualized with respect to the restored diamond in the virtual region, and determining the relative positional relationship between them,
    A crown shape creation step of projecting the shape of the restored crown portion of the diamond viewed from the virtual viewpoint in a two-dimensional manner in the set positional relationship, and specifying the two-dimensional shape as a projected crown shape;
    Inverse simulated light beam generation step of irradiating a plurality of simulated light beams from the viewpoint with respect to the projected crown shape;
    A simulation step of simulating the path of each of the plurality of simulated rays according to the laws of reflection and refraction;
    Of the simulated simulated light rays, the simulated light rays emitted toward the upper part from the restored crown portion of the diamond are stored as light rays incident from the restored diamond crown portion reach the viewpoint. Simulated ray storage step;
    The diamond cut evaluation method is characterized in that the steps are sequentially executed.
  14. The relative position setting step sets a plurality of relative positions of the restored diamond and the virtual viewpoint at a predetermined interval,
    14. The diamond cut evaluation method according to claim 13, wherein the computer executes the reverse simulated light beam generation step, the simulation step, and the reaching simulated light beam storage step for each of the plurality of positions.
  15. The reverse simulated light beam generating step includes a wavelength changing step of changing the wavelength of the simulated light beam to be generated,
    This wavelength changing step is to set a plurality of simulated light wavelengths in the visible light range,
    The diamond cut evaluation method according to claim 13 or 14, wherein the computer executes the simulation step and the arrival simulated light beam storing step for each of a plurality of wavelengths of the simulated light beam.
  16. A crown region dividing step of dividing a region of the crown portion of the restored diamond into a plurality of areas as viewed from a virtual viewpoint in the relative position setting step;
    The diamond cut evaluation according to any one of claims 13 to 15, wherein the computer executes the reverse simulated light beam generation step, the simulation step, and the arrival simulated light beam storage step for each of the plurality of areas. Method.
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WO2014174680A1 (en) * 2013-04-26 2014-10-30 株式会社中央宝石研究所 Diamond certificate and method for creating said certificate
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US9678018B2 (en) 2015-03-30 2017-06-13 Gemological Institute Of America Inc. (Gia) Apparatus and method for assessing optical quality of gemstones
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JP2003042964A (en) * 2001-08-02 2003-02-13 Central Gem Laboratory Quality evaluation method and device for diamond through image of refracted and reflected light
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