Sample image photographing method and method for calculating size (volume) of sample using same

Abstract

The present invention relates to a sample image photographing method and a method for calculating the size (volume) of a sample using same and, more specifically, to a sample image photographing method for precisely calculating the size (volume) of a sample by clearly photographing the boundary of the sample, and a method for calculating the size (volume) of a sample using same. In order to achieve the above objective, the present invention provides a sample image photographing method comprising the steps of: irradiating background light toward a sample; obtaining a sample image by photographing the sample irradiated with the background light; determining the validity of the sample image; if it is determined that the sample image is not valid, changing a photographing condition and restarting from the step of irradiating the background light toward the sample; and, if it is determined that the sample image is valid, classifying the sample image as a final image.

Description

Method for capturing sample images and method for calculating sample size (volume) using the same

[0001] The present invention relates to a method for capturing a sample image and a method for calculating the size (volume) of a sample using the same. More specifically, it relates to a method for capturing a sample image to clearly capture the boundaries of the sample and a method for calculating the size (volume) of a sample using the same.

[0002]

[0003] To measure the size (volume) of a sample, it is necessary to accurately determine the boundary of the sample and accurately measure its width.

[0004] However, there was a problem in accurately measuring these interfaces when the sample was a light-emitting material or at ultra-high temperatures of 3000K or higher.

[0005] Figure 1 is an example diagram showing a sample image according to the temperature of the sample.

[0006] Specifically, as shown in FIG. 1, as the temperature of the sample increases, the thermal radiation and ultraviolet rays emitted from the sample mix with the surrounding background light, and the contrast between the sample and the background weakens. As a result, the boundary surface (3) between the sample area (1) and the background area (2) appears blurry, and it becomes difficult to clearly identify the location of the boundary surface (3).

[0007] Furthermore, interface measurement errors reduce the reliability of size (volume) calculations and the resulting thermal expansion coefficient and density data, making it difficult to accurately measure the material's physical properties.

[0008] Furthermore, at extremely high temperatures, tools used to fix or measure samples may melt or deform, potentially leading to sample contamination. Such contamination can not only degrade the accuracy and reproducibility of measurement data but also distort the characteristics of the sample itself.

[0009] Therefore, a technology is needed to capture sample images with clear interfaces and calculate the size (volume) of the sample, regardless of the type or temperature of the sample.

[0010]

[0011] The problem information related to the present invention is as follows.

[0012] 1) Project No.: 24571011

[0013] Research Project Name: Institutional Project

[0014] Research Project Title: Development of 4000 K-Class Ultra-High Temperature Material Property Measurement Technology and Measurement Platform

[0015] Contribution rate: 50%

[0016] Organizing Agency: Korea Research Institute of Standards and Science

[0017] Research Period: July 1, 2024 – June 30, 2025

[0018]

[0019] 2) Project Number: 24011134

[0020] Research Project Name: Institutional Project

[0021] Research Project Title: 3-3-04. Development of a Converged Measurement System for the Development of Advanced Extreme Materials Development of R-TEM Measurement System (Extreme Measurement Research Team)

[0022] Contribution rate: 50%

[0023] Organizing Agency: Korea Research Institute of Standards and Science

[0024] Research Period: 2024.01.01 ~ 2024.12.31

[0025]

[0026] <Prior Art Literature>

[0027] U.S. Patent No. 10,823,723

[0028]

[0029] The objective of the present invention, which aims to solve the above-mentioned problem, is to provide a method for capturing a sample image to clearly capture the boundaries of the sample and to precisely calculate the size (volume) of the sample, and a method for calculating the size (volume) of the sample using the same.

[0030] The technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0031]

[0032] The present invention, for achieving the above-mentioned purpose, provides a method for capturing a sample image characterized by comprising: a step of irradiating a background light toward a sample; a step of photographing the sample while it is irradiated with the background light to obtain a sample image; a step of determining the validity of the sample image; a step of changing the shooting conditions and restarting from the step of irradiating the background light toward the sample if the sample image is determined to be invalid; and a step of classifying the sample image as a final image if the sample image is determined to be valid.

[0033] In an embodiment of the present invention, in the step of irradiating background light toward a sample, the background light may be characterized by including ultraviolet light, infrared light, and visible light.

[0034] In an embodiment of the present invention, the step of determining the validity of the sample image may be characterized by comprising: a step of obtaining a graph expressing brightness intensity according to the width direction distance in the obtained sample image; a step of obtaining a derivative of the differential value of the brightness intensity in the graph; a step of obtaining a pair of inflection points where the absolute value of the derivative is maximum; a step of obtaining an inflection interval of the pair of inflection points; and a step of determining that it is valid when the length of the inflection interval is less than or equal to a preset reference value.

[0035] In an embodiment of the present invention, the reference value may be characterized as being pre-set as a value when the contrast between the sample area and the background area in the sample image is 50 or higher.

[0036] In an embodiment of the present invention, when the sample image is determined to be invalid, the shooting conditions are changed, and in the step of restarting from the step of illuminating the sample with background light, the shooting conditions may be characterized by adjusting the intensity of the background light.

[0037] In an embodiment of the present invention, when the sample image is determined to be invalid, the step of changing the shooting conditions and restarting from the step of illuminating the sample with background light may be further characterized by having a filter unit that blocks the wavelength of light generated from the sample and passes the wavelength of the background light.

[0038] In an embodiment of the present invention, in the step where background light is irradiated toward a sample, the sample may be characterized in that it is in a state of being levitated.

[0039] The present invention, for achieving the above-mentioned purpose, provides a control system to which a sample image capturing method is applied, comprising: a lamp unit for irradiating the background light onto the sample; an imaging unit provided for capturing the sample; and a judgment unit provided for determining the validity of the captured sample image.

[0040] In an embodiment of the present invention, the invention may be characterized by including a filter portion provided between the sample and the imaging portion; and a levitation portion provided to levitate the sample captured by the imaging portion.

[0041] The present invention, for achieving the above-mentioned purpose, provides a method for calculating the size (volume) of a sample using a sample image capturing method, wherein, when the sample image is determined to be valid, after the step of classifying the sample image as a final image, the method comprises: a step of obtaining a graph expressing brightness intensity according to the distance in the width direction in the final image; a step of obtaining a derivative of the differential value of the brightness intensity in the graph; a step of obtaining a pair of inflection points where the absolute value of the derivative is maximum; a step of deriving the distance between the inflection points; and a step of calculating the size (volume) of the sample using the distance between the derivation of the inflection points.

[0042] The present invention, for achieving the above-mentioned purpose, provides a sample size (volume) calculation system using a sample image capture method, comprising: a lamp unit for irradiating the background light onto the sample; an imaging unit provided for capturing the sample; a judgment unit provided for determining the validity of the captured sample image; and a calculation unit provided for calculating the size (volume) of the sample from the sample image classified as valid.

[0043] In an embodiment of the present invention, the calculation unit may be characterized by being configured to calculate a graph representing brightness intensity according to the width direction distance in the final image, obtain a derivative of the differential value of brightness intensity from the graph, derive the distance between a pair of inflection points where the absolute value of the derivative is maximum to derive the width of the sample, and calculate the size (volume) of the sample using the width of the sample.

[0044] In an embodiment of the present invention, the calculation unit may be characterized by being configured to further calculate the density by dividing the mass of the sample by the calculated size (volume).

[0045]

[0046] The effect of the present invention according to the above configuration is that the size (volume) of the sample can be calculated more accurately by deriving a sample image that clearly distinguishes the boundary between the sample area and the background area.

[0047] Even when the sample is at a high temperature, a sample image with a clear boundary can be obtained through a filter section that floats the sample and removes wavelengths emitted from the sample.

[0048] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description of the invention or the claims.

[0049]

[0050] Figure 1 is an example diagram showing a sample image according to the temperature of the sample.

[0051] FIG. 2 is an example diagram of the configuration of a sample size (volume) calculation system according to an embodiment of the present invention.

[0052] FIG. 3 is a flowchart of a sample image capturing method according to an embodiment of the present invention.

[0053] FIG. 4 is a flowchart of the step of determining the validity of a sample image according to an embodiment of the present invention.

[0054] Figure 5 is an example diagram showing an invalid sample image.

[0055] Figure 6 is an example diagram showing a valid sample image.

[0056] Figure 7 is a flowchart of a method for calculating the size (volume) of a sample using a sample image capture method.

[0057] Figure 8 is an example diagram showing the distance between the inflection points of an invalid sample image and a valid sample image.

[0058] Figure 9 is a graph showing the effect of the difference in brightness between the sample area and the background area.

[0059] Figure 10 is a graph showing the density of the sample according to temperature and the change in density according to the difference in brightness between the sample area and the background area.

[0060] Figure 11 is a graph showing the density and thermal expansion of a sample at a given temperature.

[0061]

[0062] A most preferred embodiment according to the present invention comprises: a step of irradiating a background light toward a sample; a step of photographing the sample while the background light is irradiated to obtain a sample image; a step of determining the validity of the sample image; a step of changing the shooting conditions and restarting from the step of irradiating the background light toward the sample if the sample image is determined to be invalid; and a step of classifying the sample image as a final image if the sample image is determined to be valid.

[0063]

[0064] The present invention will be described below with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0065] Throughout the specification, when it is stated that a part is "connected (connected, in contact, combined)" with another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members interposed between them. Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components.

[0066] The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0067] Additionally, terms such as "...part," "...unit," and "...module" as described in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software.

[0068] Additionally, in this specification, when a step is described as being located "before" or "after" another step, this includes not only cases where a step is in a direct chronological relationship with another step, but also cases where there is an indirect chronological relationship in which the chronological order of the two steps may change, such as a mixing step following each step.

[0069] Embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0070] FIG. 2 is an example diagram of the configuration of a sample size (volume) calculation system according to an embodiment of the present invention.

[0071] Referring to FIG. 2, the sample size (volume) calculation system may include a lamp unit (110), an imaging unit (120), a judgment unit (130), a buoyancy unit (140), a filter unit (150), and a calculation unit (160).

[0072] The lamp unit (110) may be configured to irradiate background light toward the sample (10). At this time, the background light irradiated by the lamp unit (110) may be any one of ultraviolet light, visible light, and infrared light.

[0073] The above-mentioned imaging unit (120) is positioned opposite the lamp unit (110) with the sample (10) at the center and can be configured to photograph the sample (10) to obtain a sample image.

[0074] The above judgment unit (130) may be provided to determine the validity of a sample image captured by the above imaging unit (120). The above judgment unit (130) may determine that the boundary surface of the sample image is clear as valid, and a detailed explanation thereof will be provided later.

[0075] The above-mentioned levitation unit (140) may be provided to levitate the sample (10) using magnetic force or the like. Specifically, when the sample (10) is at an ultra-high temperature of 3000K or higher, it is difficult to manufacture a tool that can directly support the sample (10), and the temperature of the sample (10) changes rapidly due to an object that comes into direct contact with the sample, making it difficult to accurately measure its physical properties. Therefore, the above-mentioned levitation unit (140) may be provided to levitate the sample (10) so that it is heated without coming into contact with other objects.

[0076] The sample (10) floated by the above-mentioned float (140) can be heated to a preset temperature by the heating unit.

[0077] The filter unit (150) may be provided between the sample (10) and the imaging unit (120), and may be provided to block the wavelength of light generated from the sample (10) and to allow the wavelength of the background light to pass through.

[0078] Specifically, when the sample (10) reaches an ultra-high temperature state above a certain temperature, light is emitted from the sample itself, and depending on the type of sample (10), it may be a sample (10) that reflects light or emits light itself. In this case, the boundary between the sample region (1) and the background region (2) in the sample image captured by the light emitted from the sample (10) becomes unclear, and as a result, it is difficult to determine the exact width of the sample (10), so the size (volume) cannot be measured precisely.

[0079] Accordingly, the filter unit (150) can be provided as a bandpass filter that blocks the wavelength of light generated from the sample (10) in this way.

[0080] The above calculation unit (160) may be configured to calculate the size (volume) of the sample from the sample image classified as valid. Specifically, the above calculation unit (160) may be configured to accurately derive the width, etc. of the sample (10) from a plurality of the above sample images and to calculate the size (volume) of the sample (10) based on this. In addition, the above calculation unit may be configured to further calculate the density by dividing the mass of the sample (10) by the calculated size (volume). The specific operation of the above calculation unit (160) will be described later.

[0081]

[0082] FIG. 3 is a flowchart of a sample image capturing method according to an embodiment of the present invention.

[0083] Referring to FIG. 3, the method for capturing a sample image may include a step of irradiating a background light toward a sample (S110), a step of capturing a sample in a state where the background light is irradiated to obtain a sample image (S120), a step of determining the validity of the sample image (S130), a step of changing the shooting conditions and restarting from the step of irradiating the background light toward the sample if the sample image is determined to be invalid (S140), and a step of classifying the sample image as a final image if the sample image is determined to be valid (S150).

[0084] First, in the step (S110) where background light is irradiated toward the sample, the lamp unit (110) may be configured to irradiate any background light toward the sample (10).

[0085] At this time, the sample (10) can be prepared in a state heated to a preset temperature.

[0086] In addition, when the sample (10) is in a super high temperature state, the sample (10) can be prepared in a state of being levitated in the air using magnetic force or the like by using the levitation part (140).

[0087] Next, in the step (S120) of obtaining a sample image by photographing a sample in a state where background light is irradiated, the imaging unit (120) may be configured to photograph the sample (10) in a state where background light is irradiated to obtain a sample image.

[0088] FIG. 4 is a flowchart of the step of determining the validity of a sample image according to an embodiment of the present invention.

[0089] Figure 5 is an example diagram showing an invalid sample image, and Figure 6 is an example diagram showing a valid sample image.

[0090] Referring to FIGS. 4 to 6, the step of determining the validity of a sample image (S130) may include: a step of obtaining a graph expressing brightness intensity according to the width direction distance in the obtained sample image (S131); a step of obtaining a derivative of the derivative value of brightness intensity in the graph (S132); a step of obtaining a pair of inflection points where the absolute value of the derivative is maximum (S133); a step of obtaining an inflection interval of a pair of inflection points (S134); and a step of determining that it is valid when the length of the inflection interval is less than or equal to a preset reference value (S135).

[0091] In the step (S131) ​​of obtaining a graph expressing brightness intensity according to the width direction distance in the obtained sample image, a graph expressing brightness intensity according to the width direction distance can be obtained as shown in FIG. 5.

[0092] The above graph can be arranged to represent brightness intensity with respect to a straight line passing through the center of the sample.

[0093] In the step (S132) of obtaining the derivative of the brightness intensity derivative from the graph, the derivative of the brightness intensity derivative from the graph may be obtained and the derivative graph thereof may be obtained.

[0094] In the step (S133) of obtaining a pair of inflection points where the absolute value of the derivative is maximized, a pair of inflection points where the absolute value of the derivative is maximized can be derived. These inflection points are generally formed at the boundary surface (3) between the sample area (1) and the background area (2).

[0095] Next, in the step (S134) of obtaining an inflection section of a pair of inflection points, an inflection section (5) for said inflection point may be obtained. The inflection section (5) is composed of a section in which the curvature changes around said inflection point, and may mean a concave and convex section around said inflection point.

[0096] In the step (S135) where it is determined to be valid when the length of the inflection section is less than or equal to a preset reference value, it may be arranged so that it is determined to be valid when the width of the inflection section (5) is less than or equal to a preset reference value.

[0097] Specifically, the greater the difference in brightness between the sample area (1) and the background area (2), the clearer the boundary surface (3) becomes, and the more abrupt the change in the graph of the derivative becomes, the narrower the width of the inflection section (5) becomes.

[0098] Accordingly, it can be arranged so that if the width of the above-mentioned inflection section (5) is less than or equal to a preset reference value, it is determined to be a valid sample image.

[0099] At this time, the reference value may be set such that the contrast between the sample area and the background area in the sample image is 50 or higher.

[0100] At room temperature, even if the contrast is 50 or higher, the boundary surface (3) is clear, so the minimum contrast standard value can be set to 50 or higher. However, the contrast may differ depending on whether the sample temperature is 3000K or higher, or if the sample is emitting light, or the degree of the sample's emissivity, but a clear boundary surface (3) can be formed when it is 60 or higher, so in such cases, the standard value can be set as the contrast being 60 or higher.

[0101] In the step (S140) where shooting conditions are changed and the process restarts from the step of illuminating the sample with background light when the sample image is determined to be invalid, the steps of changing shooting conditions to illuminating the sample with background light (S110), photographing the sample with background light illuminating to obtain a sample image (S120), and determining the validity of the sample image (S130) may be sequentially performed again if the previously captured sample image is determined to be invalid.

[0102] At this time, the change in shooting conditions can be provided by adjusting the intensity of the background light that the lamp unit (110) irradiates toward the sample.

[0103] Additionally, changing the shooting conditions may include further arranging a filter unit (150) that blocks the wavelength of light generated from the sample (10) and passes the wavelength of the background light. In particular, when the sample (10) is in an ultra-high temperature state, or when the sample itself is a material that emits light, the wavelength of light generated from the sample (10) can be blocked by arranging the filter unit (150).

[0104] Next, in the step (S150) of classifying the sample image into a final image when the sample image is determined to be valid, the sample image may be classified as a valid sample image when the width of the inflection section (5) satisfies a preset standard value as shown in FIG. 6 as a result of determining the validity of the sample image, and the brightness contrast becomes 120.

[0105]

[0106] Figure 7 is a flowchart of a method for calculating the size (volume) of a sample using a sample image capture method, and Figure 8 is an example diagram showing the distance between the inflection point of an invalid sample image and a valid sample image.

[0107] Referring to FIG. 7, the method for calculating the size (volume) of a sample using a sample image capturing method may be configured to further include, after the step (S150) of classifying the sample image as a final image when the sample image is determined to be valid in the above-described sample image capturing method, the step (S210) of obtaining a graph expressing brightness intensity according to the width direction distance in the final image, the step (S220) of obtaining a derivative of the derivative value of brightness intensity in the graph, the step (S230) of obtaining a pair of inflection points where the absolute value of the derivative is maximized, the step (S240) of deriving the distance between the inflection points, and the step (S250) of calculating the size (volume) of the sample using the distance between the derivation points.

[0108] In the step (S210) of obtaining a graph expressing brightness intensity according to width distance in the final image, a graph expressing brightness intensity according to width distance in the classified final image may be obtained.

[0109] Next, in the step (S220) of obtaining the derivative of the brightness intensity derivative from the graph, the derivative of the brightness intensity derivative from the graph may be obtained.

[0110] Next, in the step (S230) of obtaining a pair of inflection points where the absolute value of the derivative is maximized, the method may be configured to obtain a pair of inflection points where the absolute value of the derivative is maximized.

[0111] Next, in the step (S240) where the distance between inflection points is derived, the distance between inflection points can be derived.

[0112] For example, referring to FIG. 8, in the case of an invalid sample image, the diameter of the sample (10) is derived as 295 pixels, but in the case of a valid sample image, the width of the inflection section (5) is narrower so that the boundary can be found more clearly. As a result, the diameter of the sample (10) can be measured more accurately as 293 pixels.

[0113] In the step (S250) where the size (volume) of the sample is calculated using the distance between the derived inflection points, the size (volume) of the sample can be calculated using the distance between the derived inflection points.

[0114] For example, as shown in Fig. 8, when the sample is circular, the size (volume) can be calculated by using the distance between the inflection points as the diameter.

[0115] If the sample is not circular, it may be configured to calculate the size (volume) of the sample through sample images taken from various angles and the width, length, and width derived therefrom.

[0116] In addition, the density of the sample can be further calculated using the size (volume) calculated in the step (S250) where the size (volume) of the sample is calculated using the distance between the derived inflection points. That is, the density can be calculated by dividing the previously known mass of the sample by the calculated size (volume).

[0117] Figure 9 is a graph showing the effect of the difference in brightness between the sample area and the background area.

[0118] Referring to Fig. 9, it can be seen that the width of the inflection section (5) decreases rapidly until the contrast is at least 50, and thereafter the change in the width of the inflection section (5) is minimal.

[0119] In addition, looking at the graphs located at the bottom of Figure 9, it can be seen that when the brightness contrast of the sample image is low, the density deviation is large, but as the brightness contrast of the sample image increases, the density deviation is smaller, allowing for a more accurate calculation.

[0120] Figure 10 is a graph showing the density of the sample according to temperature and the change in density according to the difference in brightness between the sample area and the background area.

[0121] Referring to Figure 10, it can be seen that as the temperature increases, the deviation of the density measurement values ​​of sample images with low contrast increases. This is because as the temperature rises, the contrast decreases further due to the wavelength of light emitted from the sample itself, resulting in lower calculation accuracy.

[0122] In addition, graphs (a) and (c) of Fig. 10 show temperatures below 3000K, and it can be seen that the measured density value becomes relatively constant even when the contrast is 35 or higher.

[0123] However, looking at graphs (b) and (d) of Fig. 10, it can be seen that when the sample temperature is ultra-high at 3000K or higher, relatively uniform density measurements can be obtained when the contrast is 49 or higher.

[0124] Figure 11 is a graph showing the density and thermal expansion of a sample at a given temperature.

[0125] Referring to Figure 11, it can be seen that at ultra-high temperatures of 3000K or higher, the deviation tends to increase due to the light emitted from the sample.

[0126] As such, the present invention described above has the feature of being able to capture a sample image capable of accurately measuring the length, width, and height of a sample at room temperature or high temperature in order to more accurately determine the size (volume), physical properties, etc. of the sample.

[0127] Although the foregoing description of the present invention has been illustrated with reference to the drawings, it is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form. Furthermore, the described techniques may be performed in a different order than the described method.

[0128] The embodiments described in this specification and the accompanying drawings are merely illustrative of some of the technical ideas included in the present invention. Accordingly, the scope of the present invention is defined by the claims set forth below, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.

[0129]

[0130] <Explanation of Symbols>

[0131] 110: Lamp section

[0132] 120: Imaging unit

[0133] 130: Judgment Department

[0134] 140: Injury

[0135] 150: Filter section

[0136] 160: Output section

Claims

1. A step in which background light is irradiated toward the sample; A step of obtaining a sample image by photographing the sample while it is in a state where the background light is irradiated; A step of determining the validity of the above sample image; If the above sample image is determined to be invalid, a step of changing the shooting conditions and restarting from the step in which background light is irradiated toward the sample; and A method for capturing a sample image characterized by including a step of classifying the sample image as a final image when the sample image is determined to be valid.

2. In Paragraph 1, In the step where background light is irradiated toward the sample, The above background light is, A method for capturing sample images characterized by including ultraviolet, infrared, and visible light.

3. In Paragraph 1, The step of determining the validity of the above sample image is, A step of obtaining a graph expressing brightness intensity according to width direction distance in the obtained sample image; A step of obtaining the derivative of the brightness intensity derivative from the above graph; A step of obtaining a pair of inflection points where the absolute value of the above derivatives is maximized; A step of obtaining an inflection interval of a pair of the above-mentioned inflection points; and A method for capturing a sample image characterized by including a step of determining it to be valid when the length of the inflection section is less than or equal to a preset reference value.

4. In Paragraph 3, The above reference value is, A method for capturing a sample image characterized by being preset to a value when the contrast between the sample area and the background area in the sample image is 50 or higher.

5. In Paragraph 1, If the above sample image is determined to be invalid, the shooting conditions are changed, and in the step where the process restarts from the stage where background light is irradiated toward the sample, A method for capturing a sample image characterized by adjusting the intensity of background light under the above-mentioned shooting conditions.

6. In Paragraph 1, If the above sample image is determined to be invalid, the step of changing the shooting conditions and restarting from the step where background light is irradiated toward the sample is, A method for capturing a sample image, characterized by further providing a filter section that blocks the wavelength of light generated from the sample and passes the wavelength of the background light.

7. In Paragraph 1, In the step where background light is irradiated toward the sample, A method for capturing a sample image characterized by the above sample being in a levitating state.

8. In a control system to which the sample image capturing method according to claim 1 is applied, A lamp unit that irradiates the background light onto the sample; An imaging unit provided to photograph the above sample; and A control system applying a sample image capturing method characterized by including a judgment unit provided to determine the validity of the captured sample image.

9. In Paragraph 8, A filter portion provided between the above sample and the above imaging portion; and A control system applying a sample image capturing method characterized by including a levitation unit provided to levitate the sample captured by the imaging unit.

10. In a method for calculating the size (volume) of a sample using a sample image capturing method according to claim 3, If the above sample image is determined to be valid, after the step of classifying the above sample image as a final image, A step of obtaining a graph expressing brightness intensity according to width distance in the above final image; A step of obtaining the derivative of the brightness intensity derivative from the above graph; A step of obtaining a pair of inflection points where the absolute value of the above derivatives is maximized; A step of deriving the distance between the above inflection points; and A method for calculating the size (volume) of a sample using a sample image capturing method, characterized by including a step of calculating the size (volume) of the sample using the distance between the derived inflection points.

11. In a system for calculating the size (volume) of a sample using a sample image capturing method according to claim 3, A lamp unit that irradiates the background light onto the sample; An imaging unit provided to photograph the above sample; A judgment unit provided to determine the validity of the above-mentioned sample image; and A system for calculating the size (volume) of a sample using a sample image capturing method, characterized by including a calculation unit provided to calculate the size (volume) of the sample from the sample image classified as valid.

12. In Paragraph 11, The above calculation unit is, A graph expressing brightness intensity according to width distance in the above final image is calculated, and From the above graph, obtain the derivative of the brightness intensity derivative, and The width of the sample is derived by deriving the distance between a pair of inflection points where the absolute value of the above derivatives is maximized, and A system for calculating the size (volume) of a sample using a sample image capture method, characterized by being configured to calculate the size (volume) of the sample using the width of the sample.

13. In Paragraph 11, The above calculation unit is, A sample size (volume) calculation system using a sample image capture method, characterized by being configured to further calculate density by dividing the mass of the above sample by the calculated size (volume).

Images