Gloss Surface Distribution Measuring Device

Abstract

To provide a glossiness surface distribution amount measuring apparatus capable of easily measuring a glossiness surface distribution amount of a measuring object surface area.SOLUTION: A glossiness surface distribution amount measuring apparatus comprises: a light source 6 emitting parallel light at an incidence angle θi to a measuring object surface S; a large diameter convex lens 10 forming an object side telecentric optical system with an optical axis parallel with regular reflection light; a diaphragm changeover mechanism 11 switching between a first diaphragm state of being arranged in an image side focal position of the large diameter convex lens 10 perpendicular to the optical axis, and including a diaphragm hole formed so as to transmit only regular reflection light parallel to an object side optical axis around the optical axis and a second diaphragm state in which the diaphragm hole is radially enlarged and an enlarged passage hole is formed for transmitting the regular reflection light and diffuse reflection light from the measuring object surface S; an imaging sensor 14 measuring an amount of each light of regular reflection light transmitting through the diaphragm hole and regular reflection light and diffuse reflection light transmitting through the enlarged passage hole; and a glossiness surface distribution amount calculation part 5b calculating a glossiness surface distribution amount of the measuring object surface S on the basis of the amount of each light of the regular reflection light and the diffuse reflection light.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a glossiness surface distribution amount measuring device capable of easily measuring the glossiness surface distribution amount for a region of a surface to be measured.

Background Art

[0002] In order to manage the appearance of a product, it is important to stabilize the glossiness of the product surface. Here, when using a gloss meter, the glossiness of the product surface can be quantified. In addition, in press working, blackening, etc. appears as a sign of product defects, but this blackening, etc. can also be evaluated using glossiness.

[0003] Patent Document 1 discloses a glossiness evaluation method for detecting glossiness based on the brightness / color components of an imaging image of specularly reflected light and diffusely reflected light obtained from an object, and a configuration for receiving light at different light receiving opening angles with respect to the incident light on the object.

[0004] Patent Document 2 discloses a glossiness characteristic evaluation method for detecting glossiness based on specularly reflected light obtained from an object, and a configuration for receiving light at different light receiving opening angles with respect to the incident light on the object.

[0005] Patent Document 3 includes an illumination unit that irradiates a surface to be inspected with light from a slit that defines the opening angle of a light beam, an imaging unit that captures an image formed by reflected light from the illuminated surface to be inspected, and an operation unit that sets the incident angle of the illumination unit and the light receiving angle of the imaging unit, and discloses a configuration for obtaining an optical characteristic (glossiness) based on the reflected light obtained by the set incident angle and light receiving angle.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] By the way, a conventional gloss meter measures the gloss of a single point on a smooth surface. Therefore, there has been a problem that a great deal of labor and time are required to obtain the distribution amount of the surface gloss.

[0008] The present invention has been made to solve the above problems, and an object thereof is to provide a gloss surface distribution amount measuring device capable of easily measuring the gloss surface distribution amount with respect to the region of the measurement target surface.

MEANS FOR SOLVING THE PROBLEMS

[0009] In order to solve the above-described problems and achieve the object, the present invention is a gloss surface distribution amount measuring device for measuring the gloss surface distribution amount of a measurement target surface, and includes a light source that irradiates parallel light having a set incident angle with respect to the measurement target surface, a large-diameter convex lens that forms an object-side telecentric optical system, has an optical axis parallel to the specular reflection light of the parallel light, and to which the reflected light from the measurement target surface is incident, a first aperture state in which a diaphragm hole is formed at the image-side focal position of the large-diameter convex lens and is arranged perpendicular to the optical axis and only specular reflection light parallel to the optical axis on the object side passes through the diaphragm hole centered on the optical axis, a diaphragm switching mechanism that switches between a second aperture state in which an enlarged passage hole is formed by expanding the diaphragm hole in the radial direction and allowing the specular reflection light and the diffuse reflection light from the measurement target surface to pass through, an imaging sensor that measures the amount of each light of the specular reflection light that has passed through the diaphragm hole and the specular reflection light and the diffuse reflection light that have passed through the enlarged passage hole by the diaphragm switching of the diaphragm switching mechanism, and a gloss surface distribution amount calculation unit that calculates the gloss surface distribution amount of the measurement target surface based on the amount of each light of the specular reflection light that has passed through the diaphragm hole and the specular reflection light and the diffuse reflection light that have passed through the enlarged passage hole.

[0010] The present invention also relates to a glossiness surface distribution amount measuring apparatus for measuring the glossiness surface distribution amount of a surface to be measured, comprising: a light source that irradiates parallel light with a set incident angle onto the surface to be measured; a large-diameter convex lens that forms an object-side telecentric optical system, has an optical axis parallel to the specular reflection light of the parallel light, and onto which the reflected light from the surface to be measured is incident; a first filter disposed perpendicular to the optical axis at the image-side focal position of the large-diameter convex lens, with a first color formed in a diaphragm hole that allows only specular reflection light parallel to the optical axis on the object side to pass through; a color filter having a second filter with a second color formed in a ring passage hole that extends radially on the outer peripheral side of the diaphragm hole and allows only diffused reflection light from the surface to be measured to pass through; an imaging sensor that measures the light amounts of the specular reflection light of the first color that has passed through the diaphragm hole and the diffused reflection light of the second color that has passed through the ring passage hole; and a glossiness surface distribution amount calculation unit that calculates the glossiness surface distribution amount of the surface to be measured based on the light amounts of the specular reflection light that has passed through the diaphragm hole and the diffused reflection light that has passed through the ring passage hole.

[0011] The present invention also relates to the above invention, wherein the glossiness surface distribution amount calculation unit calculates the glossiness for each pixel or for each predetermined plurality of pixel regions, and calculates the glossiness surface distribution of the surface to be measured as the glossiness surface distribution amount.

[0012] The present invention also relates to the above invention, wherein a reference glossiness surface distribution amount for a reference surface to be measured is obtained in advance, and the glossiness surface distribution amount calculation unit calculates a normalized glossiness surface distribution amount normalized to the reference glossiness surface distribution amount.

[0013] The present invention also relates to the above invention, wherein the glossiness surface distribution amount is a value obtained by dividing the light amount of the specular reflection light by the sum of the light amounts of the specular reflection light and the diffused reflection light.

[0014] The present invention also relates to the above invention, wherein the glossiness surface distribution amount is a value obtained by dividing the light amount of the specular reflection light by the light amount of the diffused reflection light.

[0015] Further, in the present invention, in the above invention, there is provided an inclination changing unit that changes the inclination of the measurement target surface so as to change the reflection angle of the specularly reflected light reflected from the measurement target surface to a new set incident angle, and an incident angle changing unit that changes the set incident angle of the parallel light of the light source with respect to the measurement target surface to the new set incident angle.

Advantages of the Invention

[0016] According to the present invention, it is possible to easily measure the glossiness surface distribution amount with respect to the region of the measurement target surface.

Brief Description of the Drawings

[0017]

Figure 1

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Embodiments for Carrying Out the Invention

[0018] Hereinafter, with reference to the accompanying drawings, a glossiness surface distribution measuring apparatus according to the present embodiment will be described.

[0019] <General Configuration> FIG. 1 is a schematic diagram showing the configuration of a glossiness surface distribution measuring apparatus 1 according to the present embodiment. As shown in FIG. 1, the glossiness surface distribution measuring apparatus 1 receives specular reflection light and diffuse reflection light from a measurement target surface S of a measurement target 100 by an imaging camera 8 in which an object-side telecentric optical system is formed, and measures the glossiness surface distribution amount of the measurement target surface S based on the respective light amounts of the specular reflection light and the diffuse reflection light.

[0020] The glossiness surface distribution measuring apparatus 1 includes an apparatus main body 1a, a light source 6, and an imaging camera 8. The light source 6 is a white light source that irradiates parallel light having an incident angle θi, which is a preset incident angle with respect to the measurement target surface S. Here, the reflection angle θr of the specular reflection light with respect to the measurement target surface S is the same as the incident angle θi, and the measurement target surface S is arranged such that the specular reflection light is parallel to the optical axis of the imaging camera 8. In FIG. 1, the incident angle θi, which is the preset incident angle, is set to 20°.

[0021] The imaging camera 8 forms an object-side telecentric optical system, has a large-diameter convex lens 10 having an optical axis parallel to the specular reflection light of the parallel light from the light source 6 and into which the reflection light from the measurement target surface S is incident, and at the image-side focal position of the large-diameter convex lens 10, a first aperture state in which a diaphragm hole is formed that is arranged perpendicular to the optical axis and allows only specular reflection light parallel to the object-side optical axis centered on the optical axis to pass through, and a second aperture state in which an enlarged passage hole is formed that expands the diaphragm hole in the radial direction and allows the specular reflection light and the diffuse reflection light from the measurement target surface S to pass through, and a diaphragm switching mechanism 11 that switches between the two states, and an imaging sensor 14 that measures the respective light amounts of the specular reflection light that has passed through the diaphragm hole and the specular reflection light and the diffuse reflection light that have passed through the enlarged passage hole by the diaphragm switching of the diaphragm switching mechanism 11.

[0022] The apparatus main body 1a includes an input unit 2, a display unit 3, a storage unit 4, and a control unit 5. The input unit 2 is an input interface such as a mouse or a keyboard. The display unit 3 is a display interface such as a liquid crystal display for displaying various information. The storage unit 4 is a storage device such as a hard disk drive or a non-volatile memory.

[0023] The control unit 5 is a control unit that controls the entire glossiness surface distribution measuring device 1, and includes an image acquisition processing unit 5a and a glossiness surface distribution calculation unit 5b. The control unit 5 stores programs corresponding to these functional units in a storage device such as a non-volatile memory or a magnetic disk device, loads these programs into the memory, and executes them with the CPU to execute the corresponding processes.

[0024] The image acquisition processing unit 5a operates an imaging camera 8 including a light source 6 and a diaphragm switching mechanism 11 to acquire a surface image of the measurement target surface S. The image acquisition processing unit 5a irradiates parallel light from the light source 6, and acquires from the imaging sensor 14 a first image that is a surface image in the first diaphragm state and a second image that is a surface image in the second diaphragm state via the diaphragm switching mechanism 11. The first image is an image that receives only specularly reflected light, and the second image is an image that receives specularly reflected light and diffusely reflected light. Note that the diffusely reflected light is the diffusely reflected light input to the imaging camera 8 and is the diffusely reflected light around the specularly reflected light from the measurement target surface S. Therefore, the measured diffusely reflected light is a part of all diffusely reflected light. Also, the first image and the second image are captured with a constant exposure time such that the light amount does not saturate in order to accurately measure the light intensity.

[0025] The glossiness surface distribution amount calculation unit 5b calculates the glossiness surface distribution amount of the measurement target surface S based on the light amounts of the specularly reflected light that has passed through the aperture hole in the first aperture state, the specularly reflected light and the diffusely reflected light that have passed through the enlarged passage hole in the second aperture state. Generally, the glossiness is proportional to the value obtained by dividing the light intensity of the specularly reflected light by the light intensity of the incident light. Here, since it is difficult to measure the light intensity of the incident light, in the present embodiment, the light intensity of the incident light is treated as the assumed incident light intensity, which is the sum of the light intensities of the specularly reflected light and the diffusely reflected light incident on the imaging camera 8. The diffusely reflected light is reflected three-dimensionally from the incident point, and it is not possible to acquire all the diffusely reflected light with the imaging camera 8. However, when evaluating the glossiness, the diffusely reflected light around the specularly reflected light side is the diffusely reflected light effective for evaluation. In the present embodiment, a part of this diffusely reflected light is regarded as all the diffusely reflected light to measure the glossiness. Note that the light intensity of the glossiness is obtained as the light amount within a certain exposure time.

[0026] The glossiness surface distribution amount calculation unit 5b obtains the glossiness surface distribution amount (acquired glossiness surface distribution amount), which is the glossiness of the surface region of the measurement target surface S rather than the glossiness of a single point on the measurement target surface S. Therefore, the acquired glossiness surface distribution amount is the value obtained by dividing the light amount of the first image by the light amount of the second image. Since this acquired glossiness surface distribution amount is the relative glossiness surface distribution amount for a plurality of measurement target surfaces S, in the present embodiment, the reference glossiness surface distribution amount for the reference measurement target surface is obtained in advance. Then, the glossiness surface distribution amount calculation unit 5b normalizes the acquired glossiness surface distribution amount with the reference glossiness surface distribution amount, and calculates this normalized normalized glossiness surface distribution amount as the glossiness surface distribution amount.

[0027] Examples of the reference measurement target surface include a glass surface with a refractive index of 1.567. This glass surface is a material that, according to JIS standards, has a glossiness of 100 (%) when the reflectance is 5% at an incident angle of 20°. Note that according to JIS standards, the glossiness is 100 (%) when the reflectance is 10% at an incident angle of 60°. In this embodiment, the reference glossiness surface distribution amount is set to 100 (%), and a normalized glossiness surface distribution amount obtained by normalizing the acquired glossiness surface distribution amount to the reference glossiness surface distribution amount, for example, 60 (%), is calculated as the glossiness surface distribution amount. As a result, the glossiness surface distribution amount can be quantitatively measured. The measured glossiness surface distribution amount is output to the display unit 3 or the storage unit 4.

[0028] <Configuration of the imaging camera> FIG. 2 is a diagram showing the configuration of the imaging camera 8 and an example of the specular reflection light L and the diffuse reflection lights L1, L2 in the first aperture state. FIG. 3 is a diagram showing the configuration of the imaging camera 8 and an example of the specular reflection light L and the diffuse reflection lights L1, L2 in the second aperture state. FIG. 4 is a diagram showing the first aperture state and the second aperture state of the aperture switching mechanism 11.

[0029] As shown in FIGS. 2 and 3, the imaging camera 8 is provided with a large-diameter convex lens 10 on the measurement target surface S side, which has a large-diameter input region capable of inputting all specular reflection light from the measurement target surface S parallel to the optical axis C and forms an object-side telecentric optical system. Since the large-diameter convex lens 10 has a large diameter, the thickness in the optical axis C direction becomes large, so it is preferably a Fresnel lens.

[0030] The aperture switching mechanism 11 is arranged at the image-side focal point FC of the large-diameter convex lens 10. The aperture switching mechanism 11 is arranged perpendicular to the optical axis C of the large-diameter convex lens 10 and switches between a first aperture state in which an aperture hole 11a is formed to allow only the specular reflection light L parallel to the optical axis C on the object side to pass through around the focal point FC, and a second aperture state in which the aperture hole 11a is expanded in the radial direction to form an enlarged passing hole 11b through which the specular reflection light and the diffuse reflection light from the measurement target surface S pass.

[0031] Figure 2 shows the optical paths of the direct reflection light L and the diffuse reflection lights L1 and L2 in the first aperture state. Note that the diffuse reflection lights L1 and L2 are examples of the diffuse reflection light incident on the imaging camera 8. As shown in Figure 2, in the first aperture state, all of the direct reflection light L passes through the aperture hole 11a, and the diffuse reflection lights L1 and L2 do not pass through. On the other hand, Figure 3 shows the optical paths of the direct reflection light L and the diffuse reflection lights L1 and L2 in the second aperture state. In the second aperture state, all of the direct reflection light L and the diffuse reflection lights L1 and L2 pass through the enlarged passage hole 11b.

[0032] As shown in Figure 4, the aperture switching mechanism 11 is switched between a first aperture state in which the aperture hole 11a is formed and a second aperture state in which the enlarged passage hole 11b is formed. The aperture switching mechanism 11 is formed by, for example, aperture blades. Note that the enlarged passage hole 11b forms a fully open state having a diameter equivalent to the diameter of the lens barrel of the imaging camera 8. Also, not limited to the aperture blades, switching may be performed by alternately inserting and removing an aperture in which the first aperture state is formed and an aperture in which the second aperture state is formed, or switching may be performed by inserting and removing only the aperture in the first aperture state.

[0033] The aperture convex lens 13 forms an image of the light that has passed through the aperture switching mechanism 11 on the imaging sensor 14. The imaging sensor 14 captures a first image in the first aperture state and a second image in the second aperture state.

[0034] <Calculation process of specular glossiness surface distribution amount> FIG. 5 is a flowchart showing the calculation processing procedure of the glossiness surface distribution amount by the control unit 5. As shown in FIG. 5, the control unit 5 first sets the parallel light from the light source 6 to an incident angle θi with respect to the measurement target surface S, for example, an incident angle of 20°, and irradiates the measurement target surface S with the parallel light from the light source 6 in a state where the measurement target surface S is arranged so that the specularly reflected light from the measurement target surface S is parallel to the optical axis of the imaging camera 8 (step S110). Then, the control unit 5 sets the aperture switching mechanism 11 to the first aperture state (step S120) and acquires a first image of only the specularly reflected light from the imaging sensor 14 (step S130). Then, the control unit 5 sets the aperture switching mechanism 11 to the second aperture state (step S140) and acquires a second image of the specularly reflected light and the diffusely reflected light (step S150).

[0035] After that, the control unit 5 calculates, as the acquired glossiness surface distribution amount, a value obtained by dividing the light amount of the first image by the light amount of the second image (step S160). Further, the control unit 5 normalizes the acquired glossiness surface distribution amount with respect to a reference glossiness surface distribution amount obtained in advance, calculates this normalized glossiness surface distribution amount as the glossiness surface distribution amount (step S170), outputs it to the display unit 3 or the storage unit 4, and ends this process. Note that the reference glossiness surface distribution amount is obtained in advance by performing the same process as the calculation of the acquired glossiness surface distribution amount on the reference measurement target surface.

[0036] In the JIS standard, incident angles of 20°, 45°, 60°, 75°, and 85° are defined, but there is no need to stick to this. When the normalized glossiness surface distribution amount at an incident angle of 20° is 30 (%) or less, it is preferable to increase the incident angle θi, for example, obtain the normalized glossiness surface distribution amount at an incident angle of 60° to increase the measurement resolution.

[0037] In addition, in the above-described embodiment, a glass surface (specular reflection surface) is used as the reference measurement target surface, and the specular gloss surface distribution amount with respect to the glass surface is used as the reference specular gloss surface distribution amount. However, the present invention is not limited to this, and an appropriate specular gloss surface distribution amount of the measurement target surface S may be used as the reference specular gloss surface distribution amount. This reference specular gloss surface distribution amount is stored in the storage unit 4 as master data, and when the acquired specular gloss surface distribution amount exceeds ±15% of the reference specular gloss surface distribution amount, it is evaluated that the specular gloss is inappropriate. Thereby, products with a specular gloss within a certain range can be stably managed.

[0038] <Modification Example 1> FIG. 6 is a diagram showing the configuration of the color filter 21 of Modification Example 1 corresponding to the aperture switching mechanism 11. The color filter 21 has a first filter F1, which is a filter colored with a first color (red) in a region corresponding to the aperture hole 11a, formed thereon, and the specular reflection light passing through the aperture hole 11a is converted into the first color. On the other hand, a second filter F2, which is a filter colored with a second color (blue), is formed in a ring passage hole 11c that radially expands to the outer peripheral side of the aperture hole 11a and allows only the diffused reflection light from the measurement target surface S to pass through, and the diffused reflection light passing through the ring passage hole 11c is converted into the second color.

[0039] Thereby, the acquired specular gloss surface distribution amount can be obtained by dividing the light amount of the first color by the sum of the light amount of the first color and the light amount of the second color.

[0040] In this Modification Example 1, it is not necessary to switch between the first aperture state and the second aperture state like the aperture switching mechanism 11, and the acquired specular gloss surface distribution amount can be obtained by a single imaging.

[0041] <Modification Example 2> In the above-described embodiments and Modification Example 1, the average glossiness surface distribution amount was obtained as a surface in both cases. However, in this Modification Example 2, the glossiness surface distribution amount calculation unit 5b calculates the glossiness for each pixel or for each predetermined plurality of pixel regions, and calculates the glossiness surface distribution of the measurement target surface S as the glossiness surface distribution amount. As shown in FIG. 3, the glossiness surface distribution can be obtained because the position P1 of the emitted diffused reflection light corresponds to the position P2 of the diffused reflection light received by the imaging sensor 14.

[0042] Thereby, for example, as shown in FIG. 7, the glossiness surface distribution can be obtained. In the glossiness surface distribution image D shown in FIG. 7, a glossiness surface distribution having a region E1 with a low glossiness and a region E2 with a high glossiness is obtained. The region E1 is a region with a glossiness lower than a predetermined glossiness, and the region E2 is a region with a high glossiness equal to or higher than the predetermined glossiness. Note that the glossiness surface distribution image D is separated into regions by a predetermined glossiness, but is not limited thereto, and may be a color distribution or a brightness distribution in which the glossiness values are further subdivided.

[0043] <Modification Example 3> In the above-described embodiments and Modification Examples 1 and 2, the glossiness surface distribution amount was obtained as a value obtained by dividing the amount of specular reflection light by the amounts of specular reflection light and diffused reflection light. However, the present invention is not limited thereto, and a value obtained by dividing the amount of specular reflection light by only the amount of diffused reflection light may be calculated and evaluated as the glossiness surface distribution amount.

[0044] <Modification Example 4> In this Modification Example 4, when changing the incident angle θi, the inclination of the measurement target surface S and the position of the light source 6 are automatically changed. For example, as shown in FIG. 8, when changing the incident angle from 20° to 60°, the inclination change unit 31 changes the inclination of the measurement target surface S so as to change the reflection angle θr of the specular reflection light reflected from the measurement target surface S to the new set incident angle, which is 60°. Further, the incident angle change unit 32 changes the position and orientation of the light source 6 in order to change the incident angle of the parallel light of the light source 6 with respect to the measurement target surface S from the set incident angle of 20° to the new set incident angle of 60°. Note that instead of automatic change, the input unit 2 may be used as an operation unit for manual change.

[0045] Note that, as shown in FIG. 9, when the measurement object 100 has measurement target surfaces S' with different inclinations, the inclination changing unit 31 moves the measurement object 100 and adjusts the reflection angle of the measurement target surface S'. Further, the incident angle changing unit 32 moves the light source 6 and changes the direction of the light source 6 in order to ensure an incident angle of 20° with respect to the measurement target surface S'.

[0046] Note that each configuration illustrated in the above embodiments and modification examples is schematically functional, and it is not necessarily physically configured as illustrated. That is, the form of dispersion and integration of each device is not limited to that illustrated, and all or part of it can be functionally or physically dispersed and integrated in any unit according to various loads and usage situations.

Industrial Applicability

[0047] The glossiness surface distribution amount measuring device of the present invention is useful when it is desired to easily measure the glossiness surface distribution amount with respect to the region of the measurement target surface.

Explanation of Signs

[0048] 1 Glossiness surface distribution amount measuring device 1a Device main body 2 Input unit 3 Display unit 4 Storage unit 5 Control unit 5a Image acquisition processing unit 5b Glossiness surface distribution amount calculation unit 6 Light source 8 Imaging camera 10 Large-aperture convex lens 11 Diaphragm switching mechanism 11a Diaphragm hole 11b Enlarged passage hole 11c Ring passage hole 13 Diaphragm convex lens 14 Imaging sensor 21 Color filter 31 Inclination changing unit 32 Incident angle changing unit 100 Object to be measured C Optical axis D Glossiness surface distribution image E1, E2 Regions F1 First filter F2 Second filter FC Focus L Specularly reflected light L1, L2 Diffusely reflected light P1, P2 Positions S Surface to be measured θi Incident angle θr Reflection angle

Claims

1. A glossiness surface distribution amount measuring device for measuring the glossiness surface distribution amount of a surface to be measured, comprising: a light source that irradiates parallel light with a set incident angle onto the surface to be measured; a large-diameter convex lens that forms an object-side telecentric optical system, has an optical axis parallel to the specular reflection light of the parallel light, and onto which the reflected light from the surface to be measured is incident; a diaphragm switching mechanism that switches between a first diaphragm state in which a diaphragm hole is formed at the image-side focal position of the large-diameter convex lens perpendicular to the optical axis and only specular reflection light parallel to the optical axis on the object side passes through the diaphragm hole centered on the optical axis, and a second diaphragm state in which an enlarged passage hole is formed by expanding the diaphragm hole in the radial direction and both the specular reflection light and the diffuse reflection light from the surface to be measured pass through; an imaging sensor that measures the respective light amounts of the specular reflection light passing through the diaphragm hole and the specular reflection light and the diffuse reflection light passing through the enlarged passage hole by the diaphragm switching of the diaphragm switching mechanism; a glossiness surface distribution amount calculation unit that calculates the glossiness surface distribution amount of the surface to be measured based on the respective light amounts of the specular reflection light passing through the diaphragm hole and the specular reflection light and the diffuse reflection light passing through the enlarged passage hole. A glossiness surface distribution amount measuring device, characterized by comprising the above.

2. A glossiness surface distribution amount measuring device for measuring the glossiness surface distribution amount of a surface to be measured, comprising: a light source that irradiates parallel light with a set incident angle onto the surface to be measured; a large-diameter convex lens that forms an object-side telecentric optical system, has an optical axis parallel to the specular reflection light of the parallel light, and onto which the reflected light from the surface to be measured is incident; a color filter having a first filter in which a first color is formed in a diaphragm hole disposed perpendicular to the optical axis at the image-side focal position of the large-diameter convex lens and through which only specular reflection light parallel to the optical axis on the object side passes centered on the optical axis, and a second filter in which a second color is formed in a ring passage hole that is expanded radially on the outer peripheral side of the diaphragm hole and through which only the diffuse reflection light from the surface to be measured passes; an imaging sensor that measures the respective light amounts of the specular reflection light of the first color passing through the diaphragm hole and the diffuse reflection light of the second color passing through the ring passage hole; a glossiness surface distribution amount calculation unit that calculates the glossiness surface distribution amount of the surface to be measured based on the respective light amounts of the specular reflection light passing through the diaphragm hole and the diffuse reflection light passing through the ring passage hole. A glossiness surface distribution amount measuring device, characterized by comprising the above.

3. The glossiness surface distribution amount calculation unit calculates the glossiness for each pixel or for a predetermined plurality of pixel regions, and calculates the glossiness surface distribution of the measurement target surface as the glossiness surface distribution amount, according to the glossiness surface distribution amount measuring device described in claim 1 or 2.

4. A reference glossiness surface distribution amount for the reference measurement target surface is obtained in advance, The glossiness surface distribution amount calculation unit calculates a normalized glossiness surface distribution amount normalized to the reference glossiness surface distribution amount, according to the glossiness surface distribution amount measuring device described in any one of claims 1 to 3.

5. The glossiness surface distribution amount is a value obtained by dividing the amount of specularly reflected light by the sum of the amounts of specularly reflected light and diffusely reflected light, according to the glossiness surface distribution amount measuring device described in any one of claims 1 to 4.

6. The glossiness surface distribution amount is a value obtained by dividing the amount of specularly reflected light by the amount of diffusely reflected light, according to the glossiness surface distribution amount measuring device described in any one of claims 1 to 4.

7. An inclination change unit that changes the inclination of the measurement target surface to change the reflection angle of the specularly reflected light reflected from the measurement target surface to a new set incident angle, and An incident angle change unit that changes the set incident angle of the parallel light of the light source with respect to the measurement target surface to the new set incident angle The glossiness surface distribution amount measuring device according to any one of claims 1 to 6, characterized by comprising.

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