WO2022034741A1 - Measurement device, measurement system, determination method, and determination program - Google Patents

Measurement device, measurement system, determination method, and determination program Download PDF

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Publication number
WO2022034741A1
WO2022034741A1 PCT/JP2021/023006 JP2021023006W WO2022034741A1 WO 2022034741 A1 WO2022034741 A1 WO 2022034741A1 JP 2021023006 W JP2021023006 W JP 2021023006W WO 2022034741 A1 WO2022034741 A1 WO 2022034741A1
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WIPO (PCT)
Prior art keywords
pearl
pearls
pattern
image data
histogram
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PCT/JP2021/023006
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French (fr)
Japanese (ja)
Inventor
亨 荻村
真 延東
淳一郎 田原
幹大 齋藤
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株式会社ウィズアクア
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Publication of WO2022034741A1 publication Critical patent/WO2022034741A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/55—Specular reflectivity
    • G01N21/57—Measuring gloss
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/87—Investigating jewels

Definitions

  • the present invention relates to a measuring device, a measuring system, a determination method and a determination program.
  • pearls are not industrial products, so their quality varies widely.
  • the quality criteria for pearls are shape, maki, scratches, terry, color, size, etc. Pearls are generally classified by the human eye.
  • Patent Document 1 There is a method of injecting ultrasonic waves into pearls and obtaining the quality evaluation value of the pearls from the reflected waves (see Patent Document 1).
  • an ultrasonic wave is transmitted and a reflected wave from a pearl is received, and the time difference between the surface reflected wave on the surface of the pearl and the interfacial reflected wave between the pearl core and the winding causes the pearl winding. Find the thickness.
  • Patent Document 1 can measure the thickness of a roll, it does not evaluate the pearl teri.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of evaluating pearl terry.
  • the measuring device of one aspect of the present invention covers an installation portion where pearls are installed, a covering portion which covers the pearls installed in the installation portion and has a pattern containing two colors having different brightness on the installation portion side, and a pattern on the pearls. It is equipped with a light source that projects.
  • the measurement system of one aspect of the present invention includes the above-mentioned measuring device, an acquisition unit for acquiring image data obtained by photographing a pearl on which a pattern is projected, a generation unit for generating a histogram of the brightness of the image data, and a dispersion value of the histogram.
  • a determination device including an output unit that outputs an evaluation value having a positive correlation with is provided.
  • the determination method of one aspect of the present invention is to cover the installation part where the pearls are installed, the covering part which covers the pearls installed in the installation part and has a pattern containing two colors having different brightness on the installation part side, and a pattern on the pearls.
  • This is a judgment method that outputs the evaluation value of pearls using a measuring device equipped with a light source that projects pearls. It includes a step of acquiring image data, a step of generating a histogram of the brightness of the image data, and a step of outputting an evaluation value having a positive correlation with the dispersion value of the histogram.
  • the computer is provided with an installation portion where the pearls are installed, a covering portion which covers the pearls installed in the installation portion and has a pattern containing two colors having different brightness on the installation portion side, and a pearl.
  • an acquisition unit that acquires image data in which a pattern is projected on a pearl installed in an installation unit of a measuring device equipped with a light source that projects a pattern
  • a histogram generation unit that generates a histogram of the brightness of the image data. It functions as an output unit that outputs an evaluation value that has a positive correlation with the dispersion value of the histogram.
  • FIG. 1 is a diagram illustrating a system configuration of a measurement system according to an embodiment of the present invention.
  • FIG. 2 is a top view of the table.
  • FIG. 3 is a diagram illustrating a bottom view (installation portion side) of the dome.
  • FIG. 4 is a diagram illustrating an example of a pattern provided on the installation portion side of the dome.
  • FIG. 5A is an example of an image of a pearl having a good terry
  • FIG. 5B is an example of an image of a pearl having a bad terry.
  • FIG. 6 is a diagram illustrating a hardware configuration and a functional block of the determination device.
  • FIG. 7 (a) is an example of a histogram generated from an image of a pearl with a good terry
  • FIG. 7 (b) is an example of a histogram generated from an image of a pearl with a bad terry. ..
  • FIG. 8 is a flowchart illustrating a determination method by the determination device.
  • FIG. 9 is a diagram comparing the result of visual evaluation of pearls with the result of evaluation by a measuring system.
  • FIG. 10 is a diagram illustrating an example of a threshold value when evaluating from the dispersion value of pearls by a measurement system.
  • the measuring system 5 in which the measuring device 1 according to the embodiment of the present invention shown in FIG. 1 is used evaluates the pearl teri as an index. Focusing on the characteristics that pearls with good terry are easy to reflect and pearls with bad terry are hard to reflect, the measurement system 5 evaluates the pearl's teri from the image projected on the pearl. Since pearls with good territory are easy to reflect, the difference in brightness of the pattern projected on the pearls can be clearly seen. On the other hand, pearls with poor terry are hard to reflect, so the difference in brightness of the pattern projected on the pearls looks unclear.
  • the measurement system 5 projects a pattern containing two colors having different brightness onto the pearl T to be measured, photographs the image with the camera 40, and analyzes the brightness in the image data P.
  • a lightness histogram is generated for image data of two color patterns having different lightness, a histogram having two peaks is formed.
  • a histogram of brightness is generated for the image data P taken by projecting the pattern onto the pearl T, a histogram different depending on the nature of the pearl T's teri is generated.
  • each of the two colors with different brightness is clearly expressed, and the peaks of the two brightness are farther than the image data of the pearl T with bad terry, and the brightness is higher.
  • the variance value of the histogram becomes large.
  • each of the two colors with different lightness is blurred, and the peaks of the two lightness are closer than the image data obtained by photographing the pearl T with good terry, and the histogram of the lightness.
  • the variance value of is smaller.
  • the measurement system 5 calculates the dispersion value of the histogram of brightness from the image data P obtained by projecting a pattern of two colors having different brightness on the pearl T, and the calculated dispersion. Evaluate the pearl T territory based on the value.
  • the measurement system 5 includes a measurement device 1 and a determination device 2.
  • the measuring device 1 captures a state in which patterns of two colors having different brightness are projected onto the pearl T to generate image data P.
  • the determination device 2 calculates the variance value of the histogram of the brightness from the image data P captured by the measurement device 1, and evaluates the teri of the pearl T.
  • the determination device 2 acquires image data P from the measurement device 1 via a storage medium such as a USB (Universal Serial Bus) memory, a communication network, or the like.
  • USB Universal Serial Bus
  • the measuring device 1 includes a dome 10, a table 20, a light source 30, and a camera 40.
  • the dome (covered portion) 10 covers the pearl T installed in the installation portion 21.
  • the dome 10 is formed hollow.
  • the dome 10 has a hemispherical shape, and the sphere has a shape obtained by dividing the sphere into two by a virtual plane.
  • the portion in contact with the virtual plane when divided into two by the virtual plane is referred to as the bottom surface of the dome 10.
  • the bottom surface of the dome 10 is installed in contact with the table 20.
  • the pedestal 20 has a recess 22 that accommodates a portion that comes into contact with the dome 10.
  • the recess 22 has the same size as the bottom surface of the dome 10.
  • the recess 22 is formed so as to just accommodate the bottom surface of the dome 10 so that the dome 10 does not slide on the table 20.
  • the portion of the surface of the table 20 covered by the dome 10 is formed in a concave shape.
  • the recess 22 may be formed so that the portion of the surface of the table 20 in contact with the dome 10 becomes a groove.
  • the bottom surface of the dome 10 has a locking tab 12.
  • the locking tab 12 is formed on a plane including the bottom surface of the dome 10 and is formed on the outside of the dome 10.
  • the recess 22 of the pedestal 20 has a locking portion 23 that just accommodates the locking tab 12. This restricts the rotation of the dome 10 on the table 20.
  • the locking tab 12 may be formed inside the dome 10 as long as the rotation of the dome 10 on the table 20 is restricted.
  • the table 20 shown in FIG. 2 is provided with an installation unit 21 for installing the pearl T.
  • the installation portion 21 is provided on the central axis of the dome 10.
  • the installation portion 21 is a hole formed in the base 20.
  • the hole has a diameter smaller than the maximum diameter of the pearl T.
  • the installation portion 21 may be formed in any way as long as the surface of the pearl T can be photographed by the camera 40 by temporarily fixing the pearl T on the central axis of the dome 10 so as not to roll.
  • the installation portion 21 is a hollow cylinder or the like installed on the table 20, and may be formed of a member different from the table 20.
  • the table 20 is formed of a transparent member such as an acrylic plate.
  • a light source 30 is provided below the table 20. The inside of the dome 10 is brightly illuminated by the light source 30.
  • the present invention is not limited to this.
  • an LED may be provided near the bottom of the dome 10.
  • the light source 30 may illuminate the inside of the dome 10 so that the pattern inside the dome 10 is projected onto the pearl T and the vicinity of the pearl T is uniformly illuminated.
  • a pattern including two colors having different brightness is provided on the installation portion 21 side (inside) of the dome 10.
  • the light source 30 projects the pattern inside the dome 10 onto the pearl T by illuminating the inside of the dome 10 brightly.
  • the pattern of the dome 10 may be any pattern as long as it includes two colors having different brightness.
  • a black and white checkered pattern is formed inside the dome 10 as shown in FIG. 4 (a).
  • examples of other patterns include a black polka dot pattern on a white background and a white and black striped pattern as shown in FIG. 4 (b).
  • FIG. 4 a pattern with streamlines may be used as long as it is formed of two colors having different brightness. Since the teri is evaluated by the dispersion value of the histogram of lightness, the ratio of the areas of the two colors in the pattern does not matter.
  • the pattern may be a pattern in which two color areas are provided, such as black on the left half and white on the right half. If there is a locally good part and a bad part on the surface of the pearl T, the pattern of each color is as shown in each figure of FIG. It is preferable that a plurality of color regions are provided and each is provided discretely. The entire surface of the pearl T can be evaluated by a pattern in which a plurality of color regions of each color are provided and each is provided discretely.
  • two colors with different brightness are appropriately set according to the environment, performance, and the grain size of the evaluation of the pearl T of the measurement system 5.
  • "Two colors with different lightness” are selected so that the dispersion value of the lightness is different according to the evaluation criteria of the pearl T teri. For example, even if two colors have different lightness, the difference in lightness is small, and the dispersion value of lightness when shooting a pearl T with good teri and the dispersion value of lightness when shooting a pearl T with poor teri are distinguished. If you can't, it's not preferable.
  • two colors with different brightness can be distinguished so that the dispersion value of the brightness of the image data P obtained by photographing each pearl T can be distinguished.
  • "two colors with different lightness” are selected so that the dispersion value of the lightness is calculated with the accuracy that can be classified into each grade.
  • the difference in brightness becomes the maximum value, so that it is easy to evaluate the dispersion value of the brightness of the image data P.
  • the present invention is not limited to this.
  • it may be a color containing a tint, and if it is two colors having different lightness, it may be two colors having different hues such as light blue and dark red.
  • the dome 10 has a hemispherical shape.
  • the measurement system 5 can project the pattern inside the dome 10 onto the pearl T under the same conditions regardless of the shooting environment.
  • a through hole 11 is formed in the zenith portion of the dome 10.
  • the through hole 11 is formed so that the optical axis of the camera 40 for photographing the pearl T can pass through. It is possible that the light outside the dome 10 leaks from the through hole 11 into the dome 10 and the outside scenery is reflected on the surface of the pearl T, but the inside of the dome 10 is brightly illuminated by the light source 30. Thereby, the influence on the outside of the dome 10 can be suppressed.
  • FIG. 3 a case where the through hole 11 is provided in the black portion of the pattern inside the dome 10 will be described, but the through hole 11 may be provided at an arbitrary place. If the position and pattern of the through hole 11 are the same, the influence on the evaluation of the pearl T is small.
  • the dome 10 is preferably formed of a member having a light-shielding property. By coating the outside of the dome 10 in black, the light-shielding property of the dome 10 may be realized. Since the dome 10 has a light-shielding property, the scenery outside the dome 10 is not reflected on the pearl T installed in the installation unit 21, so that the measuring device 1 can use the pearl T's teri without being affected by the surrounding environment. You can shoot. Even if the dome 10 does not have a light-shielding property, the measuring device 1 is formed so as not to be affected by the surrounding environment by darkening the room where the dome 10 is installed, brightening the inside of the dome 10, and the like. May be done.
  • an LED light may be provided in the dome 10 so that an LED (Light Emitting Diode) light or the like is included near the pearl T in the 40 shooting areas of the camera.
  • the LED light may be provided, for example, in the pattern portion inside the dome 10, projected onto the pearl T, and the projected LED light may be included in the photographing area of the camera 40.
  • the LED light may be provided near the installation portion 21 and the shooting area of the camera 40 may include the LED light.
  • the dome 10 shown in FIG. 1 and the like is an example and is not limited to this.
  • a covering portion that covers the pearl T installed in the installation portion 21 and has a pattern containing two colors having different brightness may be used on the installation portion 21 side. For example, if there is a space between the covering portion and the table 20, and even if external light leaks into the space, the space between the covering portion and the table 20 is brightly illuminated by the light source 30, the image data P is external. Not affected by the light of.
  • the covering may have any shape as long as the pattern inside the covering can be projected onto the pearl T.
  • the covering portion is not limited to a hemispherical shape, and may have an arbitrary three-dimensional shape that contacts the table 20, a plate that does not contact the table 20, a curtain, or the like.
  • the covering portion has a three-dimensional shape, the change in brightness due to the connection of the surfaces can be suppressed by providing the boundary between the white region and the black region at the connection portion of the surfaces.
  • the covering portion and the mounting portion 21 may be formed so that the shape of the covering portion and the positional relationship between the pearl T installed on the installation portion 21 and the covering portion have a predetermined positional relationship.
  • the covering portion (dome 10) and the light source are separate members, but the present invention is not limited to this.
  • a liquid crystal display or a display having a light emitting element such as an organic EL may be used, or the covering portion and the light source may be integrally formed.
  • the pattern displayed on the display is projected on the pearl T installed in the installation unit 21.
  • the dome 10 is provided with the through hole 11 through which the light source of the camera 40 passes has been described, but the present invention is not limited to this.
  • the through hole 11 may not be necessary.
  • the through hole 11 of the dome 10 may be closed with a transparent member.
  • the mounting example of the dome 10 is not limited to the one shown in FIG. 1 and the like, and various modes can be considered.
  • FIG. 5 (a) and 5 (b) are image data obtained by projecting a pattern inside the dome 10 onto a pearl T having a good terry and a pearl T having a bad terry, respectively.
  • the checkered pattern appearing in FIG. 5A has clear black and white edges, and the white region portion and the black region portion can be clearly distinguished and is clear.
  • the black and white edges are unclear, it is difficult to distinguish between the white area and the black area, and the pattern is dark and dull as a whole.
  • the determination device 2 analyzes the image data P as shown in FIG. 5 to evaluate the teri of the pearl T.
  • the determination device 2 is a general computer including a storage device 50, a processing device 60, and an input / output interface 70.
  • Each function shown in FIG. 6 is realized by a general computer executing a determination program for realizing a predetermined function.
  • the judgment program can be stored in a computer-readable recording medium such as HDD, SSD, USB (Universal Serial Bus) memory, CD (Compact Disc), DVD (Digital Versatile Disc), or distributed via a network. can.
  • the storage device 50 is a ROM (ReadOnlyMemory), a RAM (RandomAccessMemory), a hard disk, or the like, and stores various data such as input data, output data, and intermediate data for the processing device 60 to execute processing. ..
  • the processing device 60 is a CPU (Central Processing Unit) that reads and writes data stored in the storage device 50 and inputs / outputs data to / from the input / output interface 70 to perform processing in the determination device 2.
  • the input / output interface 70 is an interface for the determination device 2 to acquire image data P, which is a USB port or a communication interface.
  • the storage device 50 stores the determination program and also stores the image data P.
  • the image data P is data taken by the measuring device 1.
  • the processing device 60 includes an acquisition unit 61, a brightness calculation unit 62, a generation unit 63, and an output unit 64.
  • the acquisition unit 61 acquires the image data P.
  • the image data P is data obtained by photographing the pearl T on which the pattern on the installation portion 21 side of the dome 10 is projected.
  • the acquisition unit 61 acquires the image data P measured by the measuring device 1 via the input / output interface 70.
  • the acquisition unit 61 stores the acquired image data P in the storage device 50.
  • the acquisition unit 61 may store the image data obtained by cutting out the pattern portion inside the dome 10 from the image data P by pattern matching in the storage device 50.
  • the brightness calculation unit 62 calculates the brightness of each pixel of the image data P.
  • the brightness calculation unit 62 calculates the brightness of each pixel by a general method.
  • the brightness calculation unit 62 converts, for example, the full-color image data P into a grayscale image, and acquires the brightness of each pixel in the grayscale image.
  • the brightness calculation unit 62 may calculate the brightness for each of a plurality of pixels such as two pixels.
  • the generation unit 63 generates a histogram of the brightness of the image data P.
  • the generation unit 63 generates a histogram for the brightness of each pixel calculated by the brightness calculation unit 62.
  • the brightness is expressed by 256 gradations of 0-255 and one gradation is one brightness on the horizontal axis of the histogram will be described.
  • the gradation of the histogram may be appropriately set depending on the particle size of the brightness and the like.
  • the output unit 64 outputs an evaluation value having a positive correlation with the variance value of the histogram.
  • the output unit 64 calculates the variance value of the histogram of the brightness of the image data P generated by the generation unit 63.
  • the output unit 64 may use the dispersion value itself as the evaluation value of the pearl T teri, or may use the value calculated by the function having a positive correlation with the dispersion value as the evaluation value of the pearl T teri. ..
  • the evaluation value of the pearl T may be, for example, a standard deviation calculated from the square root of the variance value.
  • FIG. 7A is a histogram generated from the image data shown in FIG. 5A.
  • FIG. 7B is a histogram generated from the image data shown in FIG. 5B.
  • the two peaks of brightness are formed apart from each other as compared with FIG. 7 (b), and the variance value is 256.
  • the histogram shown in FIG. 7 (b) two peaks of lightness are formed closer than in FIG. 7 (a), and the variance value is 36.
  • the dispersion value for the pearl T with good terry is higher than the dispersion value for the pearl T with bad terry.
  • the measurement system 5 positively correlates with the dispersion value of the histogram of brightness calculated from the image data P obtained by projecting a pattern of two colors having different brightness on the pearl T.
  • the value to have can be used as the evaluation value of the teri.
  • step S1 the determination device 2 cuts out the pattern portion projected from the image data P and calculates the brightness of each pixel.
  • the determination device 2 generates a histogram from the brightness of each pixel calculated in step S1.
  • the determination device 2 calculates the variance value of the histogram generated in step S2 as an evaluation value.
  • Groups A to J on the horizontal axis of FIG. 9 visually divide 100 pearls into 10 groups, and the pearls of group A have the best pearls and the pearls of group J have the worst pearls.
  • the vertical axis of FIG. 9 is a dispersion value calculated from the image data P of each pearl T on which the pattern is projected by the measurement system 5 according to the embodiment of the present invention.
  • the groups are rearranged on the horizontal axis according to the evaluation by the dispersion value by the measurement system 5.
  • the horizontal axes are arranged as A, B, C, D ..., but in FIG. 10, they are arranged as A, D, B, C ...
  • the threshold values 200, 150 and 100 are set, and (1) the variance value is 200 or more, (2) the variance value is less than 200 and 150 or more, (3) the variance value is less than 150 and 100 or more, and (4) the variance.
  • An example of dividing the pearl T territory into four grades with a value of less than 100 is shown.
  • the threshold value shown in FIG. 10 is an example and is not limited to this.
  • the measurement system 5 calculates an evaluation value from the dispersion value of the histogram of lightness in the image data obtained by projecting a pattern containing two colors having different lightness onto the pearl T. Since the pearl T territory can be indexed, the pearl T territory grade can be standardized.
  • the reflection emitted by the pearl T teri itself can be expressed as a dispersion value. , It becomes possible to accurately measure the teri of the pearl T.
  • the measurement system 5 can appropriately evaluate the teri of the pearl T.
  • the present invention is not limited to the above embodiment, and many modifications can be made within the scope of the gist thereof.
  • Measuring device 2 Judgment device 5 Measuring system 10 Dome 11 Through hole 12 Locking tab 20 units 21 Installation part 22 Recessed part 23 Locking part 30 Light source 40 Camera 50 Storage device 60 Processing device 61 Acquisition unit 62 Brightness calculation unit 63 Generation unit 64 Output unit 70 Input / output interface P Image data

Abstract

A measurement device 1 is provided with an installation portion 21 on which a pearl is installed, a covering portion that covers the pearl installed on the installation portion 21 and has a pattern including two colors of different brightness on the installation portion 21 side, and a light source 30 that projects the pattern onto the pearl.

Description

測定装置、測定システム、判定方法および判定プログラムMeasuring device, measuring system, judgment method and judgment program
　本発明は、測定装置、測定システム、判定方法および判定プログラムに関する。 The present invention relates to a measuring device, a measuring system, a determination method and a determination program.
　一般的に、真珠は工業製品ではないため、その品質にばらつきが大きい。真珠の品質の基準は、形、マキ、キズ、テリ、色、大きさ等である。真珠は、一般的に人の目で分類される。 In general, pearls are not industrial products, so their quality varies widely. The quality criteria for pearls are shape, maki, scratches, terry, color, size, etc. Pearls are generally classified by the human eye.
　真珠に超音波を入射し、その反射波から真珠の品質評価値を求める方法がある（特許文献１参照）。特許文献１は、超音波を送波するとともに真珠からの反射波を受信して、真珠表面での表面反射波と、真珠の核と巻との界面反射波との時間差から、真珠の巻の厚さを求める。 There is a method of injecting ultrasonic waves into pearls and obtaining the quality evaluation value of the pearls from the reflected waves (see Patent Document 1). In Patent Document 1, an ultrasonic wave is transmitted and a reflected wave from a pearl is received, and the time difference between the surface reflected wave on the surface of the pearl and the interfacial reflected wave between the pearl core and the winding causes the pearl winding. Find the thickness.
特開２００２－９０３４７号公報Japanese Unexamined Patent Publication No. 2002-90347.
　しかしながら、人の目で真珠を分類する場合、相対評価となる場合が多い。周囲の景色が真珠に投影されるなど、真珠を分類する環境によって、正しく評価できない場合がある。また特許文献１に記載の方法は、巻の厚さを計測することができるものの、真珠のテリを評価するものではない。 However, when classifying pearls with the human eye, it is often a relative evaluation. Depending on the environment in which the pearls are classified, such as the surrounding scenery being projected onto the pearls, it may not be possible to evaluate correctly. Further, although the method described in Patent Document 1 can measure the thickness of a roll, it does not evaluate the pearl teri.
　そこで、真珠のテリを客観的に評価する技術の開発が期待されている。 Therefore, it is expected to develop a technology to objectively evaluate the pearl teri.
　本発明は、上記事情に鑑みてなされたものであり、本発明の目的は、真珠のテリを評価可能な技術を提供することである。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique capable of evaluating pearl terry.
　本発明の一態様の測定装置は、真珠を設置する設置部と、設置部に設置された真珠を覆い、設置部側に明度が異なる２色を含む模様を有する被覆部と、真珠に、模様を投影する光源を備える。 The measuring device of one aspect of the present invention covers an installation portion where pearls are installed, a covering portion which covers the pearls installed in the installation portion and has a pattern containing two colors having different brightness on the installation portion side, and a pattern on the pearls. It is equipped with a light source that projects.
　本発明の一態様の測定システムは、上記測定装置と、模様が投影された真珠を撮影した画像データを取得する取得部と、画像データの明度のヒストグラムを生成する生成部と、ヒストグラムの分散値と正の相関を持つ評価値を出力する出力部を備える判定装置を備える。 The measurement system of one aspect of the present invention includes the above-mentioned measuring device, an acquisition unit for acquiring image data obtained by photographing a pearl on which a pattern is projected, a generation unit for generating a histogram of the brightness of the image data, and a dispersion value of the histogram. A determination device including an output unit that outputs an evaluation value having a positive correlation with is provided.
　本発明の一態様の判定方法は、真珠を設置する設置部と、設置部に設置された真珠を覆い、設置部側に明度が異なる２色を含む模様を有する被覆部と、真珠に、模様を投影する光源を備える測定装置を用いて、真珠の評価値を出力する判定方法であって、設置部に設置された真珠に、模様を投影するステップと、模様が投影された真珠を撮影した画像データを取得するステップと、画像データの明度のヒストグラムを生成するステップと、ヒストグラムの分散値と正の相関を持つ評価値を出力するステップを備える。 The determination method of one aspect of the present invention is to cover the installation part where the pearls are installed, the covering part which covers the pearls installed in the installation part and has a pattern containing two colors having different brightness on the installation part side, and a pattern on the pearls. This is a judgment method that outputs the evaluation value of pearls using a measuring device equipped with a light source that projects pearls. It includes a step of acquiring image data, a step of generating a histogram of the brightness of the image data, and a step of outputting an evaluation value having a positive correlation with the dispersion value of the histogram.
　本発明の一態様の判定プログラムは、コンピュータを、真珠を設置する設置部と、設置部に設置された真珠を覆い、設置部側に明度が異なる２色を含む模様を有する被覆部と、真珠に、模様を投影する光源を備える測定装置の、設置部に設置された真珠に、模様が投影された画像データを取得する取得部と、画像データの明度のヒストグラムを生成するヒストグラム生成部と、ヒストグラムの分散値と正の相関を持つ評価値を出力する出力部として機能させる。 In the determination program of one aspect of the present invention, the computer is provided with an installation portion where the pearls are installed, a covering portion which covers the pearls installed in the installation portion and has a pattern containing two colors having different brightness on the installation portion side, and a pearl. In addition, an acquisition unit that acquires image data in which a pattern is projected on a pearl installed in an installation unit of a measuring device equipped with a light source that projects a pattern, and a histogram generation unit that generates a histogram of the brightness of the image data. It functions as an output unit that outputs an evaluation value that has a positive correlation with the dispersion value of the histogram.
　本発明によれば、真珠のテリを評価可能な技術を提供することができる。 According to the present invention, it is possible to provide a technique capable of evaluating the pearl teri.
図１は、本発明の実施の形態に係る測定システムのシステム構成を説明する図である。FIG. 1 is a diagram illustrating a system configuration of a measurement system according to an embodiment of the present invention. 図２は、台の上面図である。FIG. 2 is a top view of the table. 図３は、ドームの底面図（設置部側）を説明する図である。FIG. 3 is a diagram illustrating a bottom view (installation portion side) of the dome. 図４は、ドームの設置部側に設けられる模様の例を説明する図である。FIG. 4 is a diagram illustrating an example of a pattern provided on the installation portion side of the dome. 図５（ａ）は、テリの良い真珠を撮影した画像の一例であって、図５（ｂ）は、テリの悪い真珠を撮影した画像の一例である。FIG. 5A is an example of an image of a pearl having a good terry, and FIG. 5B is an example of an image of a pearl having a bad terry. 図６は、判定装置のハードウエア構成と機能ブロックを説明する図である。FIG. 6 is a diagram illustrating a hardware configuration and a functional block of the determination device. 図７（ａ）は、テリの良い真珠を撮影した画像から生成されたヒストグラムの一例であって、図７（ｂ）は、テリの悪い真珠を撮影した画像から生成されたヒストグラムの一例である。FIG. 7 (a) is an example of a histogram generated from an image of a pearl with a good terry, and FIG. 7 (b) is an example of a histogram generated from an image of a pearl with a bad terry. .. 図８は、判定装置による判定方法を説明するフローチャートである。FIG. 8 is a flowchart illustrating a determination method by the determination device. 図９は、真珠を目視で評価した結果と、測定システムによって評価した結果を比較する図である。FIG. 9 is a diagram comparing the result of visual evaluation of pearls with the result of evaluation by a measuring system. 図１０は、測定システムによって真珠の分散値から評価する際の閾値の一例を説明する図である。FIG. 10 is a diagram illustrating an example of a threshold value when evaluating from the dispersion value of pearls by a measurement system.
　以下、図面を参照して、本発明の実施形態を説明する。図面の記載において同一部分には同一符号を付し説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same parts are designated by the same reference numerals and the description thereof will be omitted.
　（測定システム）
　図１に示す本発明の実施の形態に係る測定装置１が用いられる測定システム５は、真珠のテリを指標化して評価する。テリの良い真珠は反射しやすく、テリの悪い真珠は反射しにくい特性に着目して、測定システム５は、真珠に投影された像から、真珠のテリを評価する。テリの良い真珠は反射しやすいので、真珠に投影された模様の明暗の差が明瞭に見える。一方テリの悪い真珠は反射しにくいので、真珠に投影された模様の明暗の差が不明瞭に見える。 (Measurement system)
The measuring system 5 in which the measuring device 1 according to the embodiment of the present invention shown in FIG. 1 is used evaluates the pearl teri as an index. Focusing on the characteristics that pearls with good terry are easy to reflect and pearls with bad terry are hard to reflect, the measurement system 5 evaluates the pearl's teri from the image projected on the pearl. Since pearls with good territory are easy to reflect, the difference in brightness of the pattern projected on the pearls can be clearly seen. On the other hand, pearls with poor terry are hard to reflect, so the difference in brightness of the pattern projected on the pearls looks unclear.
　本発明の実施の形態係る測定システム５は、測定対象の真珠Ｔに、明度の異なる２色を含む模様を投影して、カメラ４０で撮影し、その画像データＰにおける明暗を分析する。明度の異なる２色の模様の画像データについて明度のヒストグラムを生成すると、２つの明度にピークを持つヒストグラムが形成される。その模様を真珠Ｔに投影して撮影した画像データＰについて明度のヒストグラムを生成すると、真珠Ｔのテリの性質によって異なるヒストグラムが生成される。テリの良い真珠Ｔを撮影した画像データＰにおいて、明度の異なる２色それぞれが明確に表現され、テリの悪い真珠Ｔを撮影した画像データと比べて、２つの明度のピークは遠くなり、明度のヒストグラムの分散値は、大きくなる。一方テリの悪い真珠Ｔの画像データＰにおいて、明度の異なる２色それぞれがぼやけて表現され、テリの良い真珠Ｔを撮影した画像データと比べて、２つの明度のピークは近くなり、明度のヒストグラムの分散値は、小さくなる。 The measurement system 5 according to the embodiment of the present invention projects a pattern containing two colors having different brightness onto the pearl T to be measured, photographs the image with the camera 40, and analyzes the brightness in the image data P. When a lightness histogram is generated for image data of two color patterns having different lightness, a histogram having two peaks is formed. When a histogram of brightness is generated for the image data P taken by projecting the pattern onto the pearl T, a histogram different depending on the nature of the pearl T's teri is generated. In the image data P of the pearl T with good terry, each of the two colors with different brightness is clearly expressed, and the peaks of the two brightness are farther than the image data of the pearl T with bad terry, and the brightness is higher. The variance value of the histogram becomes large. On the other hand, in the image data P of the pearl T with poor terry, each of the two colors with different lightness is blurred, and the peaks of the two lightness are closer than the image data obtained by photographing the pearl T with good terry, and the histogram of the lightness. The variance value of is smaller.
　本発明の実施の形態に係る測定システム５は、真珠Ｔに、明度の異なる２色の模様を投影した状態を撮影した画像データＰから、明度のヒストグラムの分散値を算出し、算出された分散値に基づいて、真珠Ｔのテリを評価する。 The measurement system 5 according to the embodiment of the present invention calculates the dispersion value of the histogram of brightness from the image data P obtained by projecting a pattern of two colors having different brightness on the pearl T, and the calculated dispersion. Evaluate the pearl T territory based on the value.
　図１に示すように、測定システム５は、測定装置１と判定装置２を備える。測定装置１は、真珠Ｔに、明度の異なる２色の模様を投影した状態を撮影して、画像データＰを生成する。判定装置２は、測定装置１において撮影された画像データＰから、判定装置２は、明度のヒストグラムの分散値を算出し、真珠Ｔのテリを評価する。判定装置２は、ＵＳＢ（Universal Serial Bus）メモリなどの記憶媒体、または通信ネットワーク等を介して、測定装置１から画像データＰを取得する。 As shown in FIG. 1, the measurement system 5 includes a measurement device 1 and a determination device 2. The measuring device 1 captures a state in which patterns of two colors having different brightness are projected onto the pearl T to generate image data P. The determination device 2 calculates the variance value of the histogram of the brightness from the image data P captured by the measurement device 1, and evaluates the teri of the pearl T. The determination device 2 acquires image data P from the measurement device 1 via a storage medium such as a USB (Universal Serial Bus) memory, a communication network, or the like.
　（測定装置）
　測定装置１は、ドーム１０、台２０、光源３０およびカメラ４０を備える。 (measuring device)
The measuring device 1 includes a dome 10, a table 20, a light source 30, and a camera 40.
　ドーム（被覆部）１０は、設置部２１に設置された真珠Ｔを覆う。ドーム１０は、中空に形成される。本発明の実施の形態においてドーム１０は、半球形状を有し、球体を、仮想平面で二分した形状を有する。本発明の実施の形態において、仮想平面で二分された際の仮想平面と接する部分を、ドーム１０の底面と称する。 The dome (covered portion) 10 covers the pearl T installed in the installation portion 21. The dome 10 is formed hollow. In the embodiment of the present invention, the dome 10 has a hemispherical shape, and the sphere has a shape obtained by dividing the sphere into two by a virtual plane. In the embodiment of the present invention, the portion in contact with the virtual plane when divided into two by the virtual plane is referred to as the bottom surface of the dome 10.
　ドーム１０の底面は、台２０に接触して設置される。台２０は、ドーム１０と接触する部分を収容する凹部２２を有する。凹部２２は、図２に示すように、ドーム１０の底面と同じ大きさを有する。凹部２２は、ドーム１０が台２０の上を滑ることないように、ドーム１０の底面をちょうど収容するように形成される。図２に示す例において、凹部２２は、台２０の表面のうち、ドーム１０に覆われる部分が凹状に形成される。凹部２２は、台２０の表面のうち、ドーム１０と接する部分が溝となるように形成されても良い。 The bottom surface of the dome 10 is installed in contact with the table 20. The pedestal 20 has a recess 22 that accommodates a portion that comes into contact with the dome 10. As shown in FIG. 2, the recess 22 has the same size as the bottom surface of the dome 10. The recess 22 is formed so as to just accommodate the bottom surface of the dome 10 so that the dome 10 does not slide on the table 20. In the example shown in FIG. 2, in the recess 22, the portion of the surface of the table 20 covered by the dome 10 is formed in a concave shape. The recess 22 may be formed so that the portion of the surface of the table 20 in contact with the dome 10 becomes a groove.
　図１に示す例において、ドーム１０の底面は、係止タブ１２を有する。係止タブ１２は、ドーム１０の底面を含む平面に形成され、ドーム１０の外側に形成される。図２に示すように、台２０の凹部２２は、係止タブ１２をちょうど収容する係止部２３を有する。これによりドーム１０による台２０の上での回転が規制される。係止タブ１２は、ドーム１０による台２０の上での回転が規制すればよく、ドーム１０の内側に形成されても良い。 In the example shown in FIG. 1, the bottom surface of the dome 10 has a locking tab 12. The locking tab 12 is formed on a plane including the bottom surface of the dome 10 and is formed on the outside of the dome 10. As shown in FIG. 2, the recess 22 of the pedestal 20 has a locking portion 23 that just accommodates the locking tab 12. This restricts the rotation of the dome 10 on the table 20. The locking tab 12 may be formed inside the dome 10 as long as the rotation of the dome 10 on the table 20 is restricted.
　図２に示される台２０に、真珠Ｔを設置する設置部２１が設けられる。設置部２１は、ドーム１０の中心軸上に設けられる。図１に示す例において設置部２１は、台２０に形成された穴である。穴は、真珠Ｔの最大直径よりも小さい直径を有する。真珠Ｔが設置部２１に嵌合するように形成されことで、球状の真珠Ｔが転がることなく一時的に固定することができる。真珠Ｔが転がらないように、ドーム１０の中心軸上に一時的に固定して、カメラ４０で真珠Ｔの表面を撮影することができれば、設置部２１はどのように形成されても良い。また設置部２１は、台２０上に設置される中空の円筒などであって、台２０と別部材で形成されても良い。 The table 20 shown in FIG. 2 is provided with an installation unit 21 for installing the pearl T. The installation portion 21 is provided on the central axis of the dome 10. In the example shown in FIG. 1, the installation portion 21 is a hole formed in the base 20. The hole has a diameter smaller than the maximum diameter of the pearl T. By forming the pearl T so as to fit into the installation portion 21, the spherical pearl T can be temporarily fixed without rolling. The installation portion 21 may be formed in any way as long as the surface of the pearl T can be photographed by the camera 40 by temporarily fixing the pearl T on the central axis of the dome 10 so as not to roll. Further, the installation portion 21 is a hollow cylinder or the like installed on the table 20, and may be formed of a member different from the table 20.
　本発明の実施の形態において台２０は、アクリル板などの、透過性を有する部材で形成される。台２０の下方に光源３０が設けられる。光源３０によって、ドーム１０内が明るく照射される。 In the embodiment of the present invention, the table 20 is formed of a transparent member such as an acrylic plate. A light source 30 is provided below the table 20. The inside of the dome 10 is brightly illuminated by the light source 30.
　本発明の実施の形態において光源３０は、台２０の下方に設けられる場合を説明したが、これに限らない。例えば、ドーム１０の底辺近傍に、ＬＥＤを設けるなどでも良い。光源３０は、ドーム１０の内側の模様が真珠Ｔに投影され、真珠Ｔの近辺が均一に照射されるように、ドーム１０の内部を照射できればよい。 In the embodiment of the present invention, the case where the light source 30 is provided below the table 20 has been described, but the present invention is not limited to this. For example, an LED may be provided near the bottom of the dome 10. The light source 30 may illuminate the inside of the dome 10 so that the pattern inside the dome 10 is projected onto the pearl T and the vicinity of the pearl T is uniformly illuminated.
　（ドーム）
　図３に示すように、ドーム１０の設置部２１側（内側）に明度が異なる２色を含む模様を有する。光源３０は、ドーム１０内を明るく照らすことにより、真珠Ｔに、ドーム１０の内側の模様を投影する。 (dome)
As shown in FIG. 3, a pattern including two colors having different brightness is provided on the installation portion 21 side (inside) of the dome 10. The light source 30 projects the pattern inside the dome 10 onto the pearl T by illuminating the inside of the dome 10 brightly.
　ドーム１０が有する模様は、明度が異なる２色を含むように成されれば、どのようなものでも良い。本発明の実施の形態において、ドーム１０の内側に、図４（ａ）に示すように、白と黒の市松模様が形成される。他の模様の例として、図４（ｂ）に示すような、白地に黒の水玉模様、白と黒のストライプ模様などがある。また図４では模式的な模様の例を挙げるが、明度の異なる２色で形成されていれば、流線の入った模様などでも良い。なお、明度のヒストグラムの分散値でテリを評価するため、模様における２色の面積の割合は、問わない。 The pattern of the dome 10 may be any pattern as long as it includes two colors having different brightness. In the embodiment of the present invention, a black and white checkered pattern is formed inside the dome 10 as shown in FIG. 4 (a). Examples of other patterns include a black polka dot pattern on a white background and a white and black striped pattern as shown in FIG. 4 (b). Further, although an example of a schematic pattern is given in FIG. 4, a pattern with streamlines may be used as long as it is formed of two colors having different brightness. Since the teri is evaluated by the dispersion value of the histogram of lightness, the ratio of the areas of the two colors in the pattern does not matter.
　また模様は、左半分が黒で右半分が白というように、２色の色領域がそれぞれ１つずつ設けられる模様でも構わない。真珠Ｔの表面において、局所的にテリの良い部分とテリの悪い部分がある場合、２色の色領域がそれぞれ１つずつ設けられる模様よりも、図４の各図に示すように、各色の色領域がそれぞれ複数設けられ、それぞれが離散的に設けられる方が好ましい。各色の色領域がそれぞれ複数設けられ、それぞれが離散的に設けられる模様により、真珠Ｔの表面全体を評価することができる。 The pattern may be a pattern in which two color areas are provided, such as black on the left half and white on the right half. If there is a locally good part and a bad part on the surface of the pearl T, the pattern of each color is as shown in each figure of FIG. It is preferable that a plurality of color regions are provided and each is provided discretely. The entire surface of the pearl T can be evaluated by a pattern in which a plurality of color regions of each color are provided and each is provided discretely.
　ここで「明度の異なる２色」は、測定システム５の環境、性能および真珠Ｔの評価の粒度等によって適宜設定される。真珠Ｔのテリの評価基準により、明度の分散値に差異が出るように、「明度の異なる２色」が選択される。例えば、明度が異なる２色であっても、明度の差分が小さく、テリの良い真珠Ｔを撮影した際の明度の分散値と、テリの悪い真珠Ｔを撮影した際の明度の分散値を区別できない場合は、好ましくない。例えば測定システム５がテリの善し悪しを区別する基準となる、テリの異なる２つの真珠Ｔについて、各真珠Ｔを撮影した画像データＰの明度の分散値を区別できるように、「明度の異なる２色」が、選択されれば良い。また、真珠Ｔのテリを複数のグレードに区分する際、各グレードに区分できる精度で明度の分散値が算出されるように、「明度の異なる２色」が選択される。「明度の異なる２色」を白と黒とした場合、明度の差分は最大値となるので、画像データＰの明度の分散値を評価しやすい。 Here, "two colors with different brightness" are appropriately set according to the environment, performance, and the grain size of the evaluation of the pearl T of the measurement system 5. "Two colors with different lightness" are selected so that the dispersion value of the lightness is different according to the evaluation criteria of the pearl T teri. For example, even if two colors have different lightness, the difference in lightness is small, and the dispersion value of lightness when shooting a pearl T with good teri and the dispersion value of lightness when shooting a pearl T with poor teri are distinguished. If you can't, it's not preferable. For example, for two pearls T having different pearls, which is a standard for the measurement system 5 to distinguish between good and bad pearls, "two colors with different brightness" can be distinguished so that the dispersion value of the brightness of the image data P obtained by photographing each pearl T can be distinguished. "Is good if it is selected. Further, when the pearl T territory is classified into a plurality of grades, "two colors with different lightness" are selected so that the dispersion value of the lightness is calculated with the accuracy that can be classified into each grade. When "two colors with different brightness" are white and black, the difference in brightness becomes the maximum value, so that it is easy to evaluate the dispersion value of the brightness of the image data P.
　本発明の実施の形態において、「明度の異なる２色」は、白と黒である場合を説明するが、これに限らない。例えば色味の入った色であってもよく、明度が異なる２色であれば、薄い水色と濃い赤など色相の異なる２色でも良い。 In the embodiment of the present invention, the case where "two colors having different brightness" are white and black will be described, but the present invention is not limited to this. For example, it may be a color containing a tint, and if it is two colors having different lightness, it may be two colors having different hues such as light blue and dark red.
　本発明の実施の形態に係る測定システム５において、ドーム１０が半球形状を有する。測定システム５は、撮影環境に依存せず、同じ条件で、ドーム１０の内側の模様を真珠Ｔに投影することができる。 In the measurement system 5 according to the embodiment of the present invention, the dome 10 has a hemispherical shape. The measurement system 5 can project the pattern inside the dome 10 onto the pearl T under the same conditions regardless of the shooting environment.
　図１および図３に示すように、ドーム１０の天頂部分に、貫通穴１１が形成される。この貫通穴１１は、真珠Ｔを撮影するカメラ４０の光軸が通過できるように形成される。貫通穴１１からドーム１０内に、ドーム１０の外側の光が漏れて、真珠Ｔの表面に外側の景色が映り込む可能性も考えられるが、ドーム１０の内側が、光源３０により明るく照射されることにより、ドーム１０の外側の影響を抑制することができる。なお、図３に示す例において、ドーム１０の内側の模様の黒部分に貫通穴１１を設ける場合を説明するが、貫通穴１１は任意の場所に設けられれば良い。貫通穴１１の位置と模様が同じであれば、真珠Ｔの評価に与える影響は少ない。 As shown in FIGS. 1 and 3, a through hole 11 is formed in the zenith portion of the dome 10. The through hole 11 is formed so that the optical axis of the camera 40 for photographing the pearl T can pass through. It is possible that the light outside the dome 10 leaks from the through hole 11 into the dome 10 and the outside scenery is reflected on the surface of the pearl T, but the inside of the dome 10 is brightly illuminated by the light source 30. Thereby, the influence on the outside of the dome 10 can be suppressed. In the example shown in FIG. 3, a case where the through hole 11 is provided in the black portion of the pattern inside the dome 10 will be described, but the through hole 11 may be provided at an arbitrary place. If the position and pattern of the through hole 11 are the same, the influence on the evaluation of the pearl T is small.
　ドーム１０は、遮光性を有する部材で形成されることが好ましい。ドーム１０の外側が黒色で塗布されることにより、ドーム１０の遮光性を実現しても良い。ドーム１０が遮光性を有することにより、設置部２１に設置された真珠Ｔに、ドーム１０外の景色が映り込まないので、測定装置１は、周辺環境の影響を受けることなく真珠Ｔのテリを撮影することができる。なお、ドーム１０が遮光性を有さない場合でも、ドーム１０が設置される室内を暗くする、ドーム１０の内部を明るくするなどにより、周辺環境の影響を受けないように、測定装置１が形成されても良い。 The dome 10 is preferably formed of a member having a light-shielding property. By coating the outside of the dome 10 in black, the light-shielding property of the dome 10 may be realized. Since the dome 10 has a light-shielding property, the scenery outside the dome 10 is not reflected on the pearl T installed in the installation unit 21, so that the measuring device 1 can use the pearl T's teri without being affected by the surrounding environment. You can shoot. Even if the dome 10 does not have a light-shielding property, the measuring device 1 is formed so as not to be affected by the surrounding environment by darkening the room where the dome 10 is installed, brightening the inside of the dome 10, and the like. May be done.
　またカメラの４０の撮影領域における真珠Ｔの近くに、ＬＥＤ（Light Emitting Diode）ライト等が含まれるように、ドーム１０内に、ＬＥＤライトを設けても良い。ＬＥＤライトは、例えば、ドーム１０の内側の模様部分に設けられ、真珠Ｔに投影され、カメラ４０の撮影領域に、投影されたＬＥＤライトが含まれても良い。あるいは、ＬＥＤライトは、設置部２１の近くに設けられ、カメラ４０の撮影領域に、ＬＥＤライトが含まれても良い。撮影者は、カメラ４０で真珠Ｔを撮影する際、ＬＥＤをピントの基準として、カメラ４０のフォーカスを合わせることにより、真珠Ｔの鮮明な画像を撮影することができる。また、カメラ４０のフォーカスを合わせた後に、ＬＥＤを消灯することにより、ＬＥＤの影響がない真珠Ｔの画像データＰを取得することができる。 Further, an LED light may be provided in the dome 10 so that an LED (Light Emitting Diode) light or the like is included near the pearl T in the 40 shooting areas of the camera. The LED light may be provided, for example, in the pattern portion inside the dome 10, projected onto the pearl T, and the projected LED light may be included in the photographing area of the camera 40. Alternatively, the LED light may be provided near the installation portion 21 and the shooting area of the camera 40 may include the LED light. When the photographer shoots the pearl T with the camera 40, the photographer can shoot a clear image of the pearl T by focusing on the camera 40 with the LED as the focus reference. Further, by turning off the LED after focusing the camera 40, it is possible to acquire the image data P of the pearl T which is not affected by the LED.
　図１等に示すドーム１０は一例であってこれに限るものではない。ドーム１０の代わりに、設置部２１に設置された真珠Ｔを覆い、設置部２１側に明度が異なる２色を含む模様を有する被覆部を用いても良い。例えば、被覆部と台２０の間に空間があり、その空間に、外部の光が漏れても、被覆部と台２０の間が、光源３０により明るく照射されていれば、画像データＰは外部の光の影響を受けない。 The dome 10 shown in FIG. 1 and the like is an example and is not limited to this. Instead of the dome 10, a covering portion that covers the pearl T installed in the installation portion 21 and has a pattern containing two colors having different brightness may be used on the installation portion 21 side. For example, if there is a space between the covering portion and the table 20, and even if external light leaks into the space, the space between the covering portion and the table 20 is brightly illuminated by the light source 30, the image data P is external. Not affected by the light of.
　また本発明の実施の形態において、ドーム１０が半球形状を有することにより、同じ条件で、ドーム１０の内側の模様を真珠Ｔに投影することができる場合を説明したが、これに限らない。被覆部の内側の模様を真珠Ｔに投影することができれば、被覆部はどのような形状であっても良い。例え被覆部は、半球形状に限らず、台２０に接触する任意の立体形状、台２０に接触しない板、幕など、任意の形状であっても良い。被覆部が立体形状の場合、面の接続部に白領域と黒領域の境界を設けることにより、面の接続に伴う明度の変化を抑えることができる。撮影環境を変えたとしても、被覆部の形状と、設置部２１に設置された真珠Ｔと被覆部との位置関係が同じであれば、被覆部の内側の模様は、同様に真珠Ｔに投影される。被覆部の形状と、設置部２１に設置された真珠Ｔと被覆部との位置関係が所定の位置関係になるように、被覆部と設置部２１が形成されれば良い。 Further, in the embodiment of the present invention, the case where the pattern inside the dome 10 can be projected onto the pearl T under the same conditions by having the dome 10 having a hemispherical shape has been described, but the present invention is not limited to this. The covering may have any shape as long as the pattern inside the covering can be projected onto the pearl T. For example, the covering portion is not limited to a hemispherical shape, and may have an arbitrary three-dimensional shape that contacts the table 20, a plate that does not contact the table 20, a curtain, or the like. When the covering portion has a three-dimensional shape, the change in brightness due to the connection of the surfaces can be suppressed by providing the boundary between the white region and the black region at the connection portion of the surfaces. Even if the shooting environment is changed, if the shape of the covering portion and the positional relationship between the pearl T installed in the installation portion 21 and the covering portion are the same, the pattern inside the covering portion is similarly projected onto the pearl T. Will be done. The covering portion and the mounting portion 21 may be formed so that the shape of the covering portion and the positional relationship between the pearl T installed on the installation portion 21 and the covering portion have a predetermined positional relationship.
　本発明の実施の形態において、被覆部（ドーム１０）と光源が別部材である場合を説明したが、これに限らない。例えば、液晶ディスプレイまたは有機ＥＬ等の発光素子を有するディスプレイを用いるなど、被覆部および光源を一体形成しても良い。この場合、コンピュータ等が明度の異なる２色で形成される模様をディスプレイに表示すると、ディスプレイに表示された模様が、設置部２１に設置される真珠Ｔに投影される。 In the embodiment of the present invention, the case where the covering portion (dome 10) and the light source are separate members has been described, but the present invention is not limited to this. For example, a liquid crystal display or a display having a light emitting element such as an organic EL may be used, or the covering portion and the light source may be integrally formed. In this case, when a computer or the like displays a pattern formed by two colors having different brightness on the display, the pattern displayed on the display is projected on the pearl T installed in the installation unit 21.
　ドーム１０に、カメラ４０の光源が通る貫通穴１１を設ける場合を説明したが、これに限らない。例えば、ドーム１０の内側に設けた小型カメラで、真珠Ｔを撮影する場合など、貫通穴１１がなくても良い場合がある。また、ドーム１０の貫通穴１１は、透明部材で塞がれても良い。 The case where the dome 10 is provided with the through hole 11 through which the light source of the camera 40 passes has been described, but the present invention is not limited to this. For example, when the pearl T is photographed by a small camera provided inside the dome 10, the through hole 11 may not be necessary. Further, the through hole 11 of the dome 10 may be closed with a transparent member.
　このようにドーム１０の実装例は、図１等に示すものに限らず、様々な態様が考えられる。 As described above, the mounting example of the dome 10 is not limited to the one shown in FIG. 1 and the like, and various modes can be considered.
　図５を参照して、測定装置１において撮影された画像データＰの一例を説明する。図５（ａ）および図５（ｂ）はそれぞれ、テリの良い真珠Ｔおよびテリの悪い真珠Ｔに、ドーム１０の内側の模様を投影した状態を撮影した画像データである。図５（ａ）に現れる市松模様は、白黒のエッジが明確で、白領域部分と黒領域部分を明確に区別できてクリアである。図５（ｂ）に現れる市松模様は、白黒のエッジが不明確で、白領域部分と黒領域部分の区別がしづらく、全体的に暗く、くすんでいる。 An example of the image data P taken by the measuring device 1 will be described with reference to FIG. 5 (a) and 5 (b) are image data obtained by projecting a pattern inside the dome 10 onto a pearl T having a good terry and a pearl T having a bad terry, respectively. The checkered pattern appearing in FIG. 5A has clear black and white edges, and the white region portion and the black region portion can be clearly distinguished and is clear. In the checkered pattern appearing in FIG. 5B, the black and white edges are unclear, it is difficult to distinguish between the white area and the black area, and the pattern is dark and dull as a whole.
　（判定装置）
　判定装置２は、図５に示すような画像データＰを解析して、真珠Ｔのテリを評価する。 (Judgment device)
The determination device 2 analyzes the image data P as shown in FIG. 5 to evaluate the teri of the pearl T.
　判定装置２は、図６に示すように、記憶装置５０、処理装置６０および入出力インタフェ－ス７０を備える一般的なコンピュータである。一般的なコンピュータが、所定の機能を実現するための判定プログラムを実行することにより、図６に示す各機能が実現される。判定プログラムは、HDD、SSD、USB（Universal Serial Bus）メモリ、CD (Compact Disc)、DVD (Digital Versatile Disc)などのコンピュータ読取り可能な記録媒体に記憶することも、ネットワークを介して配信することもできる。 As shown in FIG. 6, the determination device 2 is a general computer including a storage device 50, a processing device 60, and an input / output interface 70. Each function shown in FIG. 6 is realized by a general computer executing a determination program for realizing a predetermined function. The judgment program can be stored in a computer-readable recording medium such as HDD, SSD, USB (Universal Serial Bus) memory, CD (Compact Disc), DVD (Digital Versatile Disc), or distributed via a network. can.
　記憶装置５０は、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）、ハードディスク等であって、処理装置６０が処理を実行するための入力データ、出力データおよび中間データなどの各種データを記憶する。処理装置６０は、ＣＰＵ（Central Processing Unit）であって、記憶装置５０に記憶されたデータを読み書きしたり、入出力インタフェ－ス７０とデータを入出力したりして、判定装置２における処理を実行する。入出力インタフェ－ス７０は、判定装置２が、ＵＳＢポートまたは通信インタフェ－スであって、画像データＰを取得するためのインタフェ－スである。 The storage device 50 is a ROM (ReadOnlyMemory), a RAM (RandomAccessMemory), a hard disk, or the like, and stores various data such as input data, output data, and intermediate data for the processing device 60 to execute processing. .. The processing device 60 is a CPU (Central Processing Unit) that reads and writes data stored in the storage device 50 and inputs / outputs data to / from the input / output interface 70 to perform processing in the determination device 2. Execute. The input / output interface 70 is an interface for the determination device 2 to acquire image data P, which is a USB port or a communication interface.
　記憶装置５０は、判定プログラムを記憶するとともに、画像データＰを記憶する。画像データＰは、測定装置１において撮影されたデータである。 The storage device 50 stores the determination program and also stores the image data P. The image data P is data taken by the measuring device 1.
　処理装置６０は、取得部６１、明度算出部６２、生成部６３および出力部６４を備える。 The processing device 60 includes an acquisition unit 61, a brightness calculation unit 62, a generation unit 63, and an output unit 64.
　取得部６１は、画像データＰを取得する。画像データＰは、ドーム１０の設置部２１側の模様が投影された真珠Ｔを撮影したデータである。取得部６１は、入出力インタフェ－ス７０を介して、測定装置１において測定された画像データＰを取得する。取得部６１は、取得した画像データＰを記憶装置５０に記憶する。取得部６１は、画像データＰのうち、ドーム１０の内側の模様部分を、パターンマッチングで切り出した画像データを、記憶装置５０に記憶しても良い。 The acquisition unit 61 acquires the image data P. The image data P is data obtained by photographing the pearl T on which the pattern on the installation portion 21 side of the dome 10 is projected. The acquisition unit 61 acquires the image data P measured by the measuring device 1 via the input / output interface 70. The acquisition unit 61 stores the acquired image data P in the storage device 50. The acquisition unit 61 may store the image data obtained by cutting out the pattern portion inside the dome 10 from the image data P by pattern matching in the storage device 50.
　明度算出部６２は、画像データＰの各画素の明度を算出する。明度算出部６２は、一般的な方法で各画素の明度を算出する。明度算出部６２は、例えば、フルカラーの画像データＰをグレースケール画像に変換して、グレースケール画像における各画素の明度を取得する。なお本発明の実施の形態において、各画素に明度を算出する場合を説明するが、明度算出部６２は、２つの画素など、複数の画素毎に明度を算出しても良い。 The brightness calculation unit 62 calculates the brightness of each pixel of the image data P. The brightness calculation unit 62 calculates the brightness of each pixel by a general method. The brightness calculation unit 62 converts, for example, the full-color image data P into a grayscale image, and acquires the brightness of each pixel in the grayscale image. In the embodiment of the present invention, the case where the brightness is calculated for each pixel will be described, but the brightness calculation unit 62 may calculate the brightness for each of a plurality of pixels such as two pixels.
　生成部６３は、画像データＰの明度のヒストグラムを生成する。生成部６３は、明度算出部６２で算出された各画素の明度について、ヒストグラムを生成する。本発明の実施の形態において、明度を０－２５５の２５６階調で表現し、ヒストグラムの横軸において、１階調が１明度である場合を説明する。ヒストグラムの階調は、明度の粒度等によって適宜設定されても良い。 The generation unit 63 generates a histogram of the brightness of the image data P. The generation unit 63 generates a histogram for the brightness of each pixel calculated by the brightness calculation unit 62. In the embodiment of the present invention, the case where the brightness is expressed by 256 gradations of 0-255 and one gradation is one brightness on the horizontal axis of the histogram will be described. The gradation of the histogram may be appropriately set depending on the particle size of the brightness and the like.
　出力部６４は、ヒストグラムの分散値と正の相関を持つ評価値を出力する。出力部６４は、生成部６３が生成した画像データＰの明度のヒストグラムの分散値を算出する。出力部６４は、この分散値そのものを、真珠Ｔのテリの評価値としても良いし、この分散値と正の相関を持つ関数により算出された値を、真珠Ｔのテリの評価値としても良い。真珠Ｔの評価値は、例えば分散値の平方根から算出された標準偏差であっても良い。 The output unit 64 outputs an evaluation value having a positive correlation with the variance value of the histogram. The output unit 64 calculates the variance value of the histogram of the brightness of the image data P generated by the generation unit 63. The output unit 64 may use the dispersion value itself as the evaluation value of the pearl T teri, or may use the value calculated by the function having a positive correlation with the dispersion value as the evaluation value of the pearl T teri. .. The evaluation value of the pearl T may be, for example, a standard deviation calculated from the square root of the variance value.
　図７を参照して、判定装置２が生成したヒストグラムの一例を説明する。図７（ａ）は、図５（ａ）に示す画像データから生成されたヒストグラムである。図７（ｂ）は、図５（ｂ）に示す画像データから生成されたヒストグラムである。 An example of the histogram generated by the determination device 2 will be described with reference to FIG. 7. FIG. 7A is a histogram generated from the image data shown in FIG. 5A. FIG. 7B is a histogram generated from the image data shown in FIG. 5B.
　図７（ａ）に示すヒストグラムは、図７（ｂ）に比べて明度の２つのピークが離れて形成され、分散値が２５６である。図７（ｂ）に示すヒストグラムは、図７（ａ）に比べて明度の２つのピークが近く形成され、分散値が３６である。図７に示すように、テリの良い真珠Ｔについての分散値は、テリの悪い真珠Ｔについての分散値よりも高い。真珠Ｔに、明度の異なる２色の模様を投影した状態を撮影した画像データＰから算出された、明度のヒストグラムの分散値は、テリの評価と正の相関を有することがわかる。本発明の実施の形態に係る測定システム５は、真珠Ｔに、明度の異なる２色の模様を投影した状態を撮影した画像データＰから算出された、明度のヒストグラムの分散値と正の相関を持つ値を、テリの評価値とすることができる。 In the histogram shown in FIG. 7 (a), the two peaks of brightness are formed apart from each other as compared with FIG. 7 (b), and the variance value is 256. In the histogram shown in FIG. 7 (b), two peaks of lightness are formed closer than in FIG. 7 (a), and the variance value is 36. As shown in FIG. 7, the dispersion value for the pearl T with good terry is higher than the dispersion value for the pearl T with bad terry. It can be seen that the variance value of the histogram of lightness calculated from the image data P obtained by projecting the patterns of two colors having different lightness on the pearl T has a positive correlation with the evaluation of teri. The measurement system 5 according to the embodiment of the present invention positively correlates with the dispersion value of the histogram of brightness calculated from the image data P obtained by projecting a pattern of two colors having different brightness on the pearl T. The value to have can be used as the evaluation value of the teri.
　図８を参照して、本発明の実施の形態に係る判定装置２による判定方法を説明する。 A determination method using the determination device 2 according to the embodiment of the present invention will be described with reference to FIG.
　ステップＳ１において判定装置２は、画像データＰから投影された模様部分を切り出して、各画素の明度を算出する。ステップＳ２において判定装置２は、ステップＳ１で算出した各画素の明度からヒストグラムを生成する。ステップＳ３において判定装置２は、ステップＳ２で生成したヒストグラムの分散値を、評価値として算出する。 In step S1, the determination device 2 cuts out the pattern portion projected from the image data P and calculates the brightness of each pixel. In step S2, the determination device 2 generates a histogram from the brightness of each pixel calculated in step S1. In step S3, the determination device 2 calculates the variance value of the histogram generated in step S2 as an evaluation value.
　図９を参照して、真珠を目視で評価した結果と、測定システムによって評価した結果を説明する。図９の横軸のグループＡないしＪは、１００個の真珠を目視で１０グループに分けたもので、Ａグループの真珠のテリが最も良く、Ｊグループの真珠のテリが最も悪い。図９の縦軸は、本発明の実施の形態に係る測定システム５が、模様が投影された各真珠Ｔの画像データＰから算出した分散値である。 With reference to FIG. 9, the result of visual evaluation of the pearl and the result of evaluation by the measurement system will be described. Groups A to J on the horizontal axis of FIG. 9 visually divide 100 pearls into 10 groups, and the pearls of group A have the best pearls and the pearls of group J have the worst pearls. The vertical axis of FIG. 9 is a dispersion value calculated from the image data P of each pearl T on which the pattern is projected by the measurement system 5 according to the embodiment of the present invention.
　Ｄグループを除いて、ＡからＪグループの順で、分散値は、下がっているので、目視でのテリの評価と、測定システム５における評価とは、概ね相関があると考えられる。しかしながら、Ｄグループについては、目視での評価と測定システム５での評価が分かれている。これは、目視での評価において、周囲の背景が映り込むなどにより、実際の評価より低く評価されたと推測される。 Except for the D group, the variance values decreased in the order of A to J group, so it is considered that there is a general correlation between the visual evaluation of the teri and the evaluation in the measurement system 5. However, for Group D, the visual evaluation and the evaluation by the measurement system 5 are separated. It is presumed that this was evaluated lower than the actual evaluation due to the reflection of the surrounding background in the visual evaluation.
　図１０を参照して、分散値による評価の閾値の一例を説明する。図１０は、測定システム５による分散値による評価に従って、横軸においてグループを並べかえたものである。具体的には、図９において、横軸をＡ、Ｂ、Ｃ、Ｄ…と並べていたところ、図１０において、Ａ、Ｄ、Ｂ、Ｃ・・・と並べ替えている。図１０に示す例は、閾値２００、１５０および１００を設定して、（１）分散値２００以上、（２）分散値２００未満１５０以上、（３）分散値１５０未満１００以上、（４）分散値１００未満と、真珠Ｔのテリを４つグレードに分ける例を示す。なお図１０に示す閾値は一例であって、これに限るものではない。 An example of the threshold value for evaluation based on the variance value will be described with reference to FIG. In FIG. 10, the groups are rearranged on the horizontal axis according to the evaluation by the dispersion value by the measurement system 5. Specifically, in FIG. 9, the horizontal axes are arranged as A, B, C, D ..., but in FIG. 10, they are arranged as A, D, B, C ... In the example shown in FIG. 10, the threshold values 200, 150 and 100 are set, and (1) the variance value is 200 or more, (2) the variance value is less than 200 and 150 or more, (3) the variance value is less than 150 and 100 or more, and (4) the variance. An example of dividing the pearl T territory into four grades with a value of less than 100 is shown. The threshold value shown in FIG. 10 is an example and is not limited to this.
　本発明の実施の形態に係る測定システム５は、明度の異なる２色を含む模様を真珠Ｔに投影した画像データにおいて、明度のヒストグラムの分散値から評価値を算出する。真珠Ｔのテリを指標化することができるので、真珠Ｔのテリのグレードを標準化することができる。 The measurement system 5 according to the embodiment of the present invention calculates an evaluation value from the dispersion value of the histogram of lightness in the image data obtained by projecting a pattern containing two colors having different lightness onto the pearl T. Since the pearl T territory can be indexed, the pearl T territory grade can be standardized.
　測定装置１において、真珠Ｔの周辺を明るく照らし、ドーム１０外の景色が真珠Ｔに映り込まないようにすることで、真珠Ｔのテリそのものが発する反射を、分散値として表現することができるので、真珠Ｔのテリを正確に測定することが可能となる。 By illuminating the periphery of the pearl T brightly in the measuring device 1 so that the scenery outside the dome 10 is not reflected on the pearl T, the reflection emitted by the pearl T teri itself can be expressed as a dispersion value. , It becomes possible to accurately measure the teri of the pearl T.
　このように本発明の実施の形態にかかる測定システム５は、真珠Ｔのテリを適切に評価することができる。 As described above, the measurement system 5 according to the embodiment of the present invention can appropriately evaluate the teri of the pearl T.
　なお、本発明は上記実施形態に限定されるものではなく、その要旨の範囲内で数々の変形が可能である。 The present invention is not limited to the above embodiment, and many modifications can be made within the scope of the gist thereof.
　１　測定装置
　２　判定装置
　５　測定システム
　１０　ドーム
　１１　貫通穴
　１２　係止タブ
　２０　台
　２１　設置部
　２２　凹部
　２３　係止部
　３０　光源
　４０　カメラ
　５０　記憶装置
　６０　処理装置
　６１　取得部
　６２　明度算出部
　６３　生成部
　６４　出力部
　７０　入出力インタフェ－ス
　Ｐ　画像データ 1 Measuring device 2 Judgment device 5 Measuring system 10 Dome 11 Through hole 12 Locking tab 20 units 21 Installation part 22 Recessed part 23 Locking part 30 Light source 40 Camera 50 Storage device 60 Processing device 61 Acquisition unit 62 Brightness calculation unit 63 Generation unit 64 Output unit 70 Input / output interface P Image data

Claims (6)

  1. 　真珠を設置する設置部と、
    　前記設置部に設置された真珠を覆い、前記設置部側に明度が異なる２色を含む模様を有する
    被覆部と、
    　前記真珠に、前記模様を投影する光源
    　を備える測定装置。     The installation part where the pearls are installed and the installation part
    A covering portion that covers the pearls installed in the installation portion and has a pattern containing two colors having different brightness on the installation portion side.
    A measuring device provided with a light source that projects the pattern onto the pearl.
  2. 　前記被覆部は、半球形状を有し、前記設置部が設けられる台に接触して設置される
    　請求項１に記載の測定装置。     The measuring device according to claim 1, wherein the covering portion has a hemispherical shape and is installed in contact with a table on which the installation portion is provided.
  3. 　前記被覆部は、後記凹部に接する係止タブを有し、
    　前記台は、前記被覆部および前記係止タブと接触する部分を収容する凹部を有する
    　をさらに備える請求項２に記載の測定装置。     The covering portion has a locking tab in contact with the recess described later, and has a locking tab.
    The measuring device according to claim 2, wherein the table further includes a recess for accommodating the covering portion and the portion in contact with the locking tab.
  4. 　請求項１ないし３のいずれか１項に記載の測定装置と、
    　前記模様が投影された真珠を撮影した画像データを取得する取得部と、
    　前記画像データの明度のヒストグラムを生成する生成部と、
    　前記ヒストグラムの分散値と正の相関を持つ評価値を出力する出力部を備える判定装置　を備える測定システム。     The measuring device according to any one of claims 1 to 3 and
    An acquisition unit that acquires image data of a pearl on which the pattern is projected, and an acquisition unit.
    A generator that generates a histogram of the brightness of the image data,
    A measurement system including a determination device including an output unit that outputs an evaluation value having a positive correlation with the dispersion value of the histogram.
  5. 　真珠を設置する設置部と、前記設置部に設置された真珠を覆い、前記設置部側に明度が異なる２色を含む模様を有する被覆部と、前記真珠に、前記模様を投影する光源を備える測定装置を用いて、真珠の評価値を出力する判定方法であって、
    　前記設置部に設置された真珠に、前記模様を投影するステップと、
    　前記模様が投影された真珠を撮影した画像データを取得するステップと、
    　前記画像データの明度のヒストグラムを生成するステップと、
    　前記ヒストグラムの分散値と正の相関を持つ評価値を出力するステップ
    　を備える判定方法。     An installation portion for installing pearls, a covering portion that covers the pearls installed in the installation portion and has a pattern containing two colors having different brightness on the installation portion side, and a light source for projecting the pattern on the pearls. It is a judgment method that outputs the evaluation value of pearls using a measuring device.
    The step of projecting the pattern on the pearls installed in the installation part,
    The step of acquiring the image data of the pearl on which the pattern is projected and
    The step of generating a histogram of the brightness of the image data and
    A determination method including a step of outputting an evaluation value having a positive correlation with the dispersion value of the histogram.
  6. 　コンピュータを、
    　真珠を設置する設置部と、前記設置部に設置された真珠を覆い、前記設置部側に明度が異なる２色を含む模様を有する被覆部と、前記真珠に、前記模様を投影する光源を備える測定装置の、前記設置部に設置された真珠に、前記模様が投影された画像データを取得する取得部と、
    　前記画像データの明度のヒストグラムを生成するヒストグラム生成部と、
    　前記ヒストグラムの分散値と正の相関を持つ評価値を出力する出力部
    　として機能させる判定プログラム。     Computer,
    An installation portion for installing pearls, a covering portion that covers the pearls installed in the installation portion and has a pattern containing two colors having different brightness on the installation portion side, and a light source for projecting the pattern on the pearls. An acquisition unit that acquires image data on which the pattern is projected onto the pearls installed in the installation unit of the measuring device, and
    A histogram generator that generates a histogram of the brightness of the image data,
    A judgment program that functions as an output unit that outputs an evaluation value that has a positive correlation with the variance value of the histogram.
PCT/JP2021/023006 2020-08-11 2021-06-17 Measurement device, measurement system, determination method, and determination program WO2022034741A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61230045A (en) * 1985-04-05 1986-10-14 Teizo Aida Method for comparing luster of curved subject by degree of fading of video
JPH05164696A (en) * 1991-12-11 1993-06-29 Nissan Motor Co Ltd Device for evaluating painted surface
JPH07239303A (en) * 1993-04-19 1995-09-12 Olympus Optical Co Ltd Jewel judging apparatus and method
JPH11142331A (en) * 1997-11-12 1999-05-28 Shinju Kagaku Kenkyusho:Kk Measurement of pearl glossiness
JP2001141658A (en) * 1999-11-17 2001-05-25 Shinju Kagaku Kenkyusho:Kk Pearl-brilliance inspection apparatus
JP2007155709A (en) * 2005-11-11 2007-06-21 Arc Harima Kk Method of evaluating image clarity
CN203479712U (en) * 2013-09-17 2014-03-12 中国计量学院 Light source for image acquisition and pearl exterior quality detector with same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61230045A (en) * 1985-04-05 1986-10-14 Teizo Aida Method for comparing luster of curved subject by degree of fading of video
JPH05164696A (en) * 1991-12-11 1993-06-29 Nissan Motor Co Ltd Device for evaluating painted surface
JPH07239303A (en) * 1993-04-19 1995-09-12 Olympus Optical Co Ltd Jewel judging apparatus and method
JPH11142331A (en) * 1997-11-12 1999-05-28 Shinju Kagaku Kenkyusho:Kk Measurement of pearl glossiness
JP2001141658A (en) * 1999-11-17 2001-05-25 Shinju Kagaku Kenkyusho:Kk Pearl-brilliance inspection apparatus
JP2007155709A (en) * 2005-11-11 2007-06-21 Arc Harima Kk Method of evaluating image clarity
CN203479712U (en) * 2013-09-17 2014-03-12 中国计量学院 Light source for image acquisition and pearl exterior quality detector with same

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