WO2019111351A1

WO2019111351A1 - Light blocking unit

Info

Publication number: WO2019111351A1
Application number: PCT/JP2017/043827
Authority: WO
Inventors: さおり松本; 小宮　康宏; 山田　邦夫; 哲大岡
Original assignee: オリンパス株式会社
Priority date: 2017-12-06
Filing date: 2017-12-06
Publication date: 2019-06-13

Abstract

A light blocking unit (100) is provided with: a light blocking section (110) having an opening (113); a first emitting section (121) and a second emitting section (122); and a chart (130) indicating reference colors. The light blocking section (110) blocks light so that external light is not inputted to a photographing optical system (210) when the light blocking section is attached so as to cover the photographing optical system, and an opening (113) is provided at a position including an optical axis (310) of the photographing optical system. The first emitting section and the second emitting section are provided on both sides by having therebetween a first plane (331) that includes the optical axis of the photographing optical system, and a first axis (321) perpendicular to the optical axis. At least a part of the chart is disposed in a center region formed by projecting a center portion of the opening to a plane perpendicular to the optical axis, and moving the center portion in the direction parallel to the first axis.

Description

Shading unit

The present invention relates to a light shielding unit.

Techniques for performing color measurement using a camera are known. In such color measurement, a color chip (reference color chart) serving as a color reference and an object of color measurement are photographed, and an image of the color chip and an image of the color measurement object are used to measure the color. The color of the object is evaluated. In such color measurement, it is required to photograph the color chip and the color measurement object under the same illumination condition. As a method for photographing a color chart and an object to be measured under the same illumination condition, there is a method of providing illumination in a light-shielded environment. For example, Japanese Patent Application Laid-Open No. 2008-102137 discloses a technique for a color measurement camera provided with a light source for illumination by shielding such outside light. Further, this document discloses a technique for a colorimetric camera having a mechanism for inserting and removing a color chip near the center of a shooting area.

As in the above-described technique, it is troublesome to shoot the reference color chart and the color measurement object separately. In addition, the apparatus tends to be large if it has a mechanism for taking in and out the reference color chart.

An object of the present invention is to provide a light shielding unit for easily performing color measurement.

According to one aspect of the present invention, the light shielding unit is configured to shield external light from entering the photographing optical system when the light shielding unit is attached to cover the photographing optical system of the imaging device, A light shielding portion having an opening at a position including the optical axis of the system, and an axis perpendicular to the optical axis as a first axis, and a plane including the optical axis and the first axis as a first surface A first emission portion and a second emission portion provided on both sides of the first surface inside the light shielding portion, each configured to emit illumination light in the direction of the opening And a reference color chart disposed on the inner side of the light shielding portion, wherein a central portion of the opening is projected on a plane perpendicular to the optical axis and moved in a direction parallel to the first axis The reference color chart when the area illuminated by the illumination light is a central area At least in part and a reference color chart is placed in the central region.

According to the present invention, it is possible to provide a light shielding unit for easily performing color measurement.

FIG. 1 is a view schematically showing an example of the configuration of a color measurement system according to an embodiment, and is a schematic view seen from the upper side of a digital camera. FIG. 2 is a block diagram showing an outline of a configuration example of a colorimetry system according to an embodiment. FIG. 3 is a view schematically showing an example of the arrangement of the aperture and the chart when the direction of the aperture is viewed from the photographing lens side. FIG. 4 is a view schematically showing an example of the arrangement of the aperture and the chart when the direction of the aperture is viewed from the photographing lens side. FIG. 5 is a view schematically showing an example of the arrangement of the aperture and the chart when the direction of the aperture is viewed from the photographing lens side. FIG. 6 is a view schematically showing an example of the arrangement of the aperture and the chart when the direction of the aperture is viewed from the photographing lens side. FIG. 7 is a view schematically showing an example of the arrangement of the aperture and the chart when the direction of the aperture is viewed from the photographing lens side. FIG. 8 is a view schematically showing an example of the arrangement of the aperture and the chart when the direction of the aperture is viewed from the photographing lens side. FIG. 9 is a view schematically showing an example of the shape of the light shielding portion and the arrangement of the chart as viewed from the side of the digital camera. FIG. 10 is a view schematically showing an example of the shape of the light shielding portion, the arrangement of the chart, and the like as viewed from the side of the digital camera. FIG. 11 is a view schematically showing an example of the shape of the light shielding portion, the arrangement of the chart, and the like as viewed from the side of the digital camera. FIG. 12 is a view schematically showing an example of the shape of the light shielding portion and the arrangement of the chart as viewed from the side of the digital camera. FIG. 13 is a view schematically showing an example of the shape of the light shielding portion, the arrangement of the chart, and the like as viewed from the side of the digital camera. FIG. 14 is a view schematically showing an example of the shape of the light shielding portion, the arrangement of the chart, and the like as viewed from the side of the digital camera. FIG. 15 is a flowchart for describing an outline of an example of the operation of the color measurement system according to an embodiment. FIG. 16 is a view schematically showing an example of the shape of the light shielding portion, the chart, the arrangement of the teeth, and the like as viewed from the side of the digital camera when the color measurement object is a tooth. FIG. 17 is a view schematically showing an example of the shape of the light shielding portion, the chart, the arrangement of the teeth, and the like as viewed from the side of the digital camera when the color measurement target is a tooth. FIG. 18 is a view schematically showing an example of the shape of the light shielding portion, the chart, the arrangement of the teeth, and the like as viewed from the side of the digital camera when the color measurement target is a tooth. FIG. 19 is a view schematically showing an example of the shape of the light shielding portion, the chart, the arrangement of the teeth, and the like as viewed from the side of the digital camera when the color measurement target is a tooth. FIG. 20 is a view schematically showing an example of the shape of the light shielding portion, the chart, the arrangement of the teeth, and the like as viewed from the side of the digital camera when the color measurement target is a tooth. FIG. 21 is a view schematically showing an example of the shape of the light shielding portion, the chart, the arrangement of the teeth, and the like as viewed from the side of the digital camera when the color measurement target is a tooth.

An embodiment of the present invention will be described with reference to the drawings. The present embodiment relates to a color measurement system that performs color measurement using a digital camera. When performing color measurement, a digital camera is used to capture an object of color measurement and a chart (color chart) serving as a color reference. An evaluation of the color of the object is performed based on the color of the object and the color of the chart in the captured image. Here, in photographing, an object and a chart need to be photographed under the same illumination condition. For this reason, in the present embodiment, shooting is performed in a state in which the illumination conditions are adjusted under a light shielding condition so as not to be affected by the external light. Further, in the present embodiment, the object and the chart are photographed at the same time for ease of photographing and analysis.

[Configuration of color measurement system]
A schematic view of a colorimetry system 1 according to the present embodiment is shown in FIG. The color measurement system 1 includes a digital camera 200 as an imaging device and a light shielding unit 100. FIG. 1 is a view schematically showing a cross section when the color measurement system 1 is viewed from above when the digital camera 200 is held in the horizontal position. Further, a block diagram showing elements included in the color measurement system 1 is shown in FIG.

As shown in FIG. 1, the digital camera 200 includes a lens unit 202 including a photographing lens 210, and an imaging element 220. The photographing lens 210 functions as a photographing optical system. That is, the imaging lens 210 includes a plurality of lenses, and forms an object image on the imaging surface of the imaging element 220. The imaging device 220 generates an image signal based on a subject image.

The digital camera 200 includes a circuit group 230, a display element 252, a battery 254, a release button 257, a recording medium 262 which can be inserted into and taken out of the digital camera 200, and the like. The circuit group 230 includes a central processing unit (CPU) 231, a random access memory (RAM) 232, a read only memory (ROM) 233, an image processing circuit 234 and the like shown in FIG. The CPU 231 operates in accordance with the program stored in the ROM 233 and controls the operation of each unit of the digital camera 200. The RAM 232 functions as a main memory of the CPU 231. The image processing circuit 234 is configured of, for example, an application specific integrated circuit (ASIC) or the like. The image processing circuit 234 performs various types of image processing on the image signal generated by the imaging device 220.

The display element 252 is, for example, a liquid crystal display (LCD) or an organic EL display. The display element 252 displays a live view image, a photographed image, a setting screen, and the like. A battery 254 is a power supply that supplies power to each unit of the digital camera 200. The operation unit 256 includes, for example, a release button 257, other dials, switches, buttons, and the like. The operation unit 256 receives various inputs from the user. The recording medium 262 records, for example, a photographed image, an analysis result, and the like.

The light shielding unit 100 can be detachably attached to, for example, the lens unit 202 of the digital camera 200. The light shielding unit 100 is provided with a light shielding portion 110, a mounting portion 112, and an opening 113. The light shielding unit 100 is attached to, for example, the lens unit 202 of the digital camera 200 via the attachment unit 112 such that the light shielding unit 110 covers the lens unit 202. Although FIG. 1 shows the case where the light shielding unit 100 is attached to the lens unit 202, the light shielding unit 100 may be attached not only to the lens unit 202 but also to, for example, the body 201 of the digital camera 200. When the digital camera 200 is a lens interchangeable type camera, the lens unit 202 is an interchangeable lens. In this case, the light shielding unit 100 may be attached to the interchangeable lens. The digital camera 200 may be, for example, a compact camera or the like having a structure in which the lens unit 202 fits in the body 201 when not in use. When the digital camera 200 is a compact camera, the light shielding unit 100 may be attached to the body 201.

The opening 113 of the light shielding unit 100 is provided so as to include the optical axis 310 of the photographing lens 210 of the digital camera 200 when the light shielding unit 100 is attached to the lens unit 202. The light blocking unit 110 blocks light so that external light from other than the opening 113 does not enter the photographing lens 210. An object 900 to be measured is placed at the position of the opening 113 and is photographed by the digital camera 200. When the object 900 is properly placed in the opening 113, the object 900 blocks the opening 113, and thus the outside light hardly enters the imaging lens 210.

The light shielding unit 100 is provided with an illumination optical system for illuminating the object 900 disposed in the opening 113. In the present embodiment, the illumination optical system has an emission unit 120 including a first emission unit 121 that emits illumination light toward the opening 113 and a second emission unit 122. In the present embodiment, the first emission unit 121 and the second emission unit 122 are disposed symmetrically with respect to the optical axis 310 of the imaging lens 210.

A light source 142 that emits illumination light emitted from the first emission unit 121 and the second emission unit 122 is provided, for example, inside the light shielding unit 110. For example, a light source 142 such as an LED may be provided in each of the first emission unit 121 and the second emission unit 122. Further, the light source 142 may be provided outside the light shielding unit 110, and the illumination light may be guided to the first emission unit 121 and the second emission unit 122.

The light shielding unit 100 includes a light source control unit 144 that controls the operation of the light source 142. The light shielding unit 100 further includes a battery 146 for supplying power to the light source 142 and the light source control unit 144. FIG. 1 shows an example in which the battery 146 is disposed behind the first light emitting unit 121 inside the light shielding unit 110, but the battery 146 may be disposed anywhere. For example, the battery 146 may be disposed elsewhere inside the light shielding unit 110 or outside the light shielding unit. In addition, the light shielding unit 100 may be supplied with power from the digital camera 200. That is, the light source 142 and the light source control unit 144 may be operated by receiving power supply from the battery 254 of the digital camera 200 instead of the battery 146 of the light shielding unit 100.

The light source 142 and the light source control unit 144 may be provided outside the light shielding unit 100 or may be provided in the digital camera 200. No matter where the light source 142 is provided, the first emission portion 121 and the second emission portion 122 for illuminating the direction of the opening 113 are symmetrical with respect to the optical axis 310 of the photographing lens 210 inside the light shielding portion 110. Arranged as.

Here, an example in which the first emission unit 121 and the second emission unit 122 are arranged to be symmetrical with respect to the optical axis 310 of the photographing lens 210 is shown, but the arrangement is not limited to this. For example, an axis perpendicular to the optical axis 310 of the photographing lens 210 is taken as a first axis 321. When a plane including the optical axis 310 and the first axis 321 is taken as the first surface 331, the first emitting portion 121 and the second emitting portion 122 are provided on both sides of the first surface 331. It should be provided. In the present embodiment, it can be said that the first axis 321 coincides with the vertical direction of the digital camera 200. The first axis 321 and the first surface 331 can be freely defined around the optical axis 310, which corresponds to the light shielding unit 100 being freely rotated around the optical axis. When it is desired to obtain an image illuminated from the left and right or from above and below, the light shielding unit 100 is connected to the digital camera 200 so that the first axis 321 is parallel to the short side or the long side of the rectangular imaging element 220. It should be fixed. In the present embodiment, the light shielding unit 100 is attached to the digital camera 200 such that the first axis 321 is parallel to the short side of the imaging device 220.

In the present embodiment, the inner wall of the light shielding portion 110 is a plane perpendicular to the optical axis 310 of the photographing lens 210 and parallel to the plane forming the opening 113, and a parallel plane And an inclined surface 114 inclined with respect to 115. In FIG. 1, the plane forming the opening 113 and the parallel plane 115 coincide with each other. In the vicinity of the opening 113 of the parallel surface 115, a chart (color chart, reference color chart) 130 serving as a color reference is provided.

The digital camera 200 simultaneously captures the object 900 disposed in the opening 113 and the chart 130 disposed in the vicinity of the opening 113, and acquires one image including the object 900 and the chart 130. . Here, the light shielding unit 100 is configured such that the illumination state of the chart 130 is substantially the same as the illumination state of the object 900.

In the present embodiment, the surface on which the chart 130 is provided is a surface perpendicular to the optical axis 310 of the photographing lens 210, but the present invention is not limited to this. It may be inclined from a plane perpendicular to the optical axis 310. Similarly, the plane formed by the opening 113 may be inclined from the plane perpendicular to the optical axis 310.

[Arrangement of the chart viewed from the shooting lens side]
A schematic view of an example when the direction of the opening 113 is viewed from the photographing lens 210 side is shown in FIG. As shown in FIG. 3, in the present embodiment, the shape of the opening 113 is a horizontally long rectangle. An object 900 of color measurement is disposed in the opening 113. In the present embodiment, a parallel surface 115 which is the same plane as the surface of the opening 113 is provided around the opening 113. Around the parallel surface 115, an inclined surface 114 having an inclination with respect to the parallel surface will be visible. In the present embodiment, the parallel surface 115 is provided with a first chart 131 and a second chart 132 as the chart 130.

The arrangement of the first chart 131 and the second chart 132 in the parallel plane 115 will be described. In the example of FIG. 3, the first specular reflection area 981 and the second specular reflection area 982 are shown in the object 900. The first regular reflection area 981 is an area on the object 900 in the optical path of the light that is specularly reflected by the object 900 and reaches the photographing lens 210 among the illumination light emitted from the first emission unit 121. That is, part of the illumination light emitted from the first emission unit 121 is specularly reflected on the first regular reflection area 981 of the object 900 and reaches the photographing lens 210. Similarly, the second regular reflection area 982 is an area on the object 900 in the light path of the light that is specularly reflected by the object 900 and reaches the photographing lens 210 among the illumination light emitted from the second emission unit 122 is there. That is, part of the illumination light emitted from the second emission unit 122 is specularly reflected on the second regular reflection area 982 of the object 900 and reaches the imaging lens 210. Therefore, in the image acquired by the digital camera 200, the first specular reflection area 981 and the second specular reflection area 982 can be recognized as glare.

In other words, in the color measurement using the color measurement system 1 of the present embodiment, the first regular reflection area 981 and the second regular reflection area 982 recognized as glare are produced symmetrically on the object 900. The positional relationship between the object 900 and the color measurement system 1 is adjusted by the user. Here, the positional relationship between the color measurement system 1 and the object 900 is such that the position to be measured on the object is located between the first regular reflection area 981 and the second regular reflection area 982. Adjusted.

An area extending the first regular reflection area 981 in the vertical direction is referred to as a first virtual area 985, and an area extending the second regular reflection area 982 in the vertical direction is referred to as a second virtual area 986. . In the present embodiment, the first chart 131 is arranged such that at least a part of the first chart 131 includes an area sandwiched between the first virtual area 985 and the second virtual area 986. Similarly, the second chart 132 is arranged such that at least a part of the second chart 132 includes an area sandwiched between the first virtual area 985 and the second virtual area 986. By arranging the first chart 131 and the second chart 132 in this manner, the first regular reflection area 981 and the second regular reflection area 982 recognized as glare symmetrically occur on the object 900. As described above, when the positional relationship between the object 900 and the color measurement system 1 is adjusted by the user, at least a part of the first chart 131 or the second chart 132 is the position and substance to be measured in the object 900. It is illuminated under similar conditions.

I want to measure the color of the object 900 by comparing the color of a part of the first chart 131 or the second chart 132 illuminated under the same conditions with the color of the position to be measured of the object 900 Analysis of the color of the position may be performed.

The first virtual area 985 and the second virtual area 986 are expressed as areas extending the first regular reflection area 981 and the second regular reflection area 982 in the vertical direction, respectively. The first virtual area 985 and the second virtual area 986 may represent the first regular reflection area 981 and the second regular reflection area 982 as an extended area of the regular reflection area in the longitudinal direction.

As described above, in the light shielding unit 100 according to the present embodiment, the chart 130 is disposed so as to include a central region in which the central portion of the opening 113 is moved, for example, up and down. In other words, when the first emitting portion 121 and the second emitting portion 122 are provided on both sides of the first surface 331 including the optical axis 310 and the first axis 321 described above, The chart 130 is an area in which the central portion of the opening 113 is projected on a plane (corresponding to a plane including the parallel plane 115) perpendicular to the optical axis 310 and moved in a direction parallel to the first axis 321. When the area illuminated with light is a central area, at least a part of the chart is arranged in the central area. The central area projects a first specular reflection area 981 and a second specular reflection area 982 onto a plane including the central area, and extends each parallel to the first axis 321. And at least a portion between the second virtual area 986. In addition, when the second surface 332 includes a middle point between the first ejection portion 121 and the second ejection portion 122 and is parallel to the first surface 331, the central region is the second surface 332. It is also true that In the present embodiment, since the first injection part 121 and the second injection part 122 are arranged symmetrically with respect to the first surface 331, the first surface 331 and the second surface 332 are Match In addition, if other conditions such as the direction of the illumination light and the light amount are properly adjusted, the first emission portion 121 and the second emission portion 122 are necessarily disposed symmetrically with respect to the first surface 331. It does not have to be done.

[Variation of chart arrangement seen from shooting lens side]
Variations of the arrangement of the chart 130 viewed from the photographing lens 210 side will be described with reference to FIGS. 4 to 8.

In the example shown in FIG. 3, as the chart 130, the first chart 131 is disposed below the opening 113, and the second chart 132 is disposed above the opening 113. On the other hand, the example shown in FIG. 4 is an example in which the chart 130 is disposed only below the opening 113. Also in this example, between the first virtual area 985 which extends the first regular reflection area 981 in the vertical direction and the second virtual area 986 which extends the second regular reflection area 982 in the vertical direction, At least a portion of the chart 130 is located. That is, at least a portion of the chart 130 is disposed in the central region.

In the example shown in FIG. 5, the chart 130 provided below the opening 113 is divided into three and arranged. Also in this example, between the first virtual area 985 which extends the first regular reflection area 981 in the vertical direction and the second virtual area 986 which extends the second regular reflection area 982 in the vertical direction, At least a portion of the chart 130 divided into three is located. That is, at least a portion of the chart 130 is disposed in the central region. Thus, the chart 130 may be divided and arranged.

In the example shown in FIG. 6, the shape of the opening 113 is not rectangular but elliptical. Further, the shape of the parallel surface 115 is also provided elliptically around the opening 113. The chart 130 is provided on such a parallel surface 115. In the example shown in FIGS. 3 to 5, the chart 130 has a rectangular shape, and the long side of the chart 130 is arranged in parallel with the horizontal direction of the digital camera 200. On the other hand, in the example shown in FIG. 6, the direction of the chart 130 is arranged to be inclined with respect to the left and right direction of the digital camera 200. Also, the chart 130 is not rectangular. Also in this example, between the first virtual area 985 which extends the first regular reflection area 981 in the vertical direction and the second virtual area 986 which extends the second regular reflection area 982 in the vertical direction, At least a portion of the chart 130 is located. That is, at least a portion of the chart 130 is disposed in the central region.

Thus, the shape of the opening 113 is not limited to a rectangle, and may be any shape such as a circle, an ellipse, or a polygon. Further, the shape of the chart 130 may be any shape, and the chart may be arranged in any direction. When the first injection portion 121 and the second emission portion 122 are disposed in the left-right direction, the opening 113 is longer in the left-right direction than in the vertical direction. The illumination light emitted from the emission unit 122 is likely to hit the object 900 without being blocked by the light shielding unit 110. That is, assuming that an axis perpendicular to the first axis 321 described above is the second axis 322, the width of the opening 113 in the direction along the second axis 322 is along the first axis 321 of the opening 113. It is preferable that the width is larger than the width in the vertical direction.

In the example shown in FIGS. 7 and 8, the chart 130 is arranged at the same position as the position shown in FIG. However, in the example shown in FIG. 7 and FIG. 8, the chart 130 includes a plurality of charts of different colors.

In the example illustrated in FIG. 7, the chart 130 includes a first chart 133, a second chart 134, and a third chart 135 which have different colors. The first chart 133, the second chart 134, and the third chart 135 are arranged in order in the vertical direction. For example, the first chart 133 may be red, the second chart 134 may be yellow, and the third chart 135 may be blue. Here, each of the first chart 133, the second chart 134, and the third chart 135 is partially a first virtual area 985 in which the first regular reflection area 981 is extended in the vertical direction, The second regular reflection area 982 is located between a second virtual area 986 which is extended in the vertical direction. That is, at least a part of each chart is arranged in the central area.

In the example shown in FIG. 8, the chart 130 is, for example, a first chart 136 which is red, a second chart 137 which is yellow, for example, a third chart 138 which is yellow, for example, and a fourth And the chart 139 of FIG. The first chart 136 and the second chart 137 are arranged side by side, and the third chart 138 and the fourth chart 139 are arranged side by side below the first chart 136 and the second chart 137 It is done. Here, any one of the first chart 136, the second chart 137, the third chart 138, and the fourth chart 139 is a part in which the first regular reflection area 981 is extended in the vertical direction. , And a second virtual area 986 obtained by extending the second regular reflection area 982 in the vertical direction. That is, at least a part of each chart is arranged in the central area.

[Variations in the shape of the light shield and the arrangement of the chart viewed from the side of the digital camera]
Variations of the shape of the light shielding portion 110 and the arrangement of the chart 130 viewed from the side of the digital camera 200 will be described with reference to FIGS. 9 to 14.

In the example shown in FIG. 9, the parallel surface 115 is provided on the same plane as the surface on which the opening 113 is provided. In this example, the chart 130 is provided on such a parallel surface 115. Further, the chart 130 is disposed above the opening 113. The chart 130 may be disposed near the subject by the chart 130 being disposed near the opening 113.

In the example shown in FIG. 10, the chart 130 provided above the opening 113 in FIG. 9 is provided below the opening 113. Thus, the chart 130 may be provided above or below the opening 113.

In the example shown in FIG. 11, a protrusion 150 as a support for supporting the object 900 is provided on the outer side of the light shielding portion 110 and below the opening 113 so that the object 900 can be easily disposed. . In the example of FIG. 11, the chart 130 is provided below the opening 113 in which the protrusion 150 is provided. Since it is assumed that the object 900 is disposed close to the side on which the protrusion 150 is provided, the chart 130 is arranged on the same side as the protrusion 150 so that the chart 130 is on the side of the object 900. It will be placed nearby.

The example shown in FIG. 11 can also be described as follows. That is, in the present embodiment, a surface perpendicular to the above-described first axis 321 extending in the vertical direction and passing through the center of gravity of the opening 113 is referred to as a third surface 333. In the example of FIG. 11, the third surface 333 is a surface extending in the left-right direction of the digital camera 200. A projecting portion 150 is provided on the lower side which is one of the spaces divided by the third surface 333 extending in the left-right direction and outside the light shielding portion 110 so as to project in the direction of the optical axis 310 of the photographing lens 210. The chart 130 is also provided below the third surface 333.

In the example shown in FIG. 12, the arrangement surface 116 on which the chart 130 is arranged and the chart 130 are provided closer to the photographing lens 210 than the plane in which the opening 113 is provided.

Unwanted matter such as dirt that contaminates the chart 130 easily enters the inside of the light shielding portion 110 from the opening 113. By arranging the chart 130 on the inner side of the light shielding portion 110 rather than the opening 113, the chart 130 is less likely to be soiled by the unwanted matter that has entered the opening 113. Further, by arranging the chart 130 on the inner side of the light shielding portion 110 rather than the opening 113, it is difficult for the outside light to hit the chart 130. That is, the light shielding property to the chart 130 is good. Further, the outer shape of the light shielding unit 100 on the side where the object 900 is arranged, that is, the tip end side can be thinner than in the case where the chart 130 is arranged on the same surface as the opening 113.

In the example shown in FIG. 13, the arrangement surface 116 on which the chart 130 is arranged is obliquely inclined with respect to the optical axis 310 of the photographing lens 210. Here, in the arrangement surface 116, the side farther from the optical axis 310 of the photographing lens 210, that is, the side farther from the opening 113 is closer to the optical axis 310 of the photographing lens 210, that is, the side closer to the opening 113. , Is inclined to be close to the photographing lens 210. By arranging the chart 130 in this manner, the tip end side of the light shielding unit 100 can be thin.

In the example shown in FIG. 14, the arrangement surface 116 on which the chart 130 is arranged is obliquely inclined with respect to the optical axis 310 of the photographing lens 210. Here, in the arrangement surface 116, the side farther from the optical axis 310 of the photographing lens 210, that is, the side farther from the opening 113 is closer to the optical axis 310 of the photographing lens 210, that is, the side closer to the opening 113. , Is inclined in the direction to be far from the shooting lens 210.

By arranging the chart 130 as shown in FIG. 14, the chart 130 is less likely to be contaminated with unwanted matter that enters from the opening 113. In addition, it becomes difficult for the outside light to hit the chart 130.

The various configurations of the light shielding unit 100 described above can be applied in various combinations. For example, as described with reference to FIG. 12, the disposition surface is disposed inside the opening 113 while the disposition surface is disposed with reference to FIG. 13 or FIG. It can be provided diagonally. Such a combination may be further provided with a protrusion 150 as described with reference to FIG. Of course, the protrusion 150 described with reference to FIG. 11 may be provided in the configuration described with reference to FIG. 12, FIG. 13 or FIG. Further, in the example shown in FIG. 11, the side on which the protrusion 150 is provided with respect to the opening 113 and the side on which the chart 130 is provided are the same, but they may be on the opposite side. That is, the protrusion 150 may be disposed below the opening 113, and the chart 130 may be disposed above the opening 113. Such a configuration may be combined with other configurations.

Also, the photographing lens described with reference to FIGS. 3 to 8 for each of the shape of the light shielding portion 110 viewed from the side of the digital camera 200 described with reference to FIGS. It is possible to combine each of the shape of the opening 113 viewed from the side and the variation of the arrangement of the chart 130.

[Operation of color measurement system]
The operation at the time of use of the colorimetry system 1 according to the present embodiment will be described with reference to the flowchart shown in FIG. The operation in FIG. 15 is started by the operation of the measurer in a state in which the measurer operating the color measurement system 1 positions the target 900 of the color measurement just before the opening 113 of the light shielding unit 100, for example. When the object 900 for color measurement is positioned immediately before the opening 113 of the light shielding unit 100, both the object 900 and the chart 130 are positioned within the angle of view of the photographing lens 210.

In step S1, the light source control unit 144 of the light shielding unit 100 controls the operation of the light source 142 to start emitting the illumination light from the emitting unit 120. As a result, the object 900 and the chart 130 in front of the opening 113 are illuminated under similar conditions. Further, at this time, the CPU 231 of the digital camera 200 causes the imaging element 220 to start shooting for creating a live view image. In the image obtained by photographing, both the object 900 and the chart 130 appear. The image processing circuit 234 performs image processing for a live view image on the obtained image to create a live view image. The CPU 231 causes the display element 252 to display a live view image. The measurer adjusts the positional relationship between the color measurement system 1 and the object 900 while viewing the live view image displayed on the display element 252. For example, the positional relationship between the color measurement system 1 and the object 900 is adjusted such that the first regular reflection area 981 and the second regular reflection area 982 recognized as glare on the object 900 appear symmetrically.

In step S2, the CPU 231 of the digital camera 200 determines whether a measurement instruction has been input by the measurer. The shooting instruction is input, for example, by pressing the release button 257 of the operation unit 256 of the digital camera 200. When the imaging instruction is not input, the process repeats step S2 and stands by. On the other hand, when a shooting instruction is input, the process proceeds to step S3.

In step S3, the CPU 231 causes the digital camera 200 to perform a shooting operation. That is, the image sensor 220 is caused to capture an image of a subject including the object 900 and the chart 130 formed on the imaging surface of the imaging device 220 by the imaging lens 210, and image data of the subject including the object 900 and the chart 130 Generate

In step S4, the image processing circuit 234 performs various predetermined image processing on the generated image data. In step S5, the image processing circuit 234 further performs image analysis. For example, the image processing circuit 234 extracts the image of the chart 130 from the image. Further, the image processing circuit 234 extracts an area suitable for analysis from the image of the object. For example, the image processing circuit 234 extracts an area to be analyzed based on the glare that appears in the image to be specularly reflected by the object 900. For example, the image processing circuit 234 may include glare (first specular reflection area 981) recognized by specular reflection of the illumination light emitted from the first emission unit 121 and illumination light emitted from the second emission unit 122. The region between the glare (second regular reflection area 982) which is recognized by the regular reflection of H.sub.2 is extracted. The image processing circuit 234 analyzes the color of the area to be analyzed by comparing the color of the area extracted as an analysis target with the color of the chart 130, using the color of the chart 130 as a reference color. The analysis area may be determined for various other reasons.

As described above, the color of the object is evaluated. The image analysis in step S5 may not be performed by the digital camera 200, but may be performed by an image analysis device outside the digital camera 200. The image analysis apparatus outside the digital camera 200 may be, for example, a personal computer, a tablet information terminal, or a server providing a cloud service.

According to the light shielding unit 100 according to the present embodiment, color measurement can be performed easily by attaching the light shielding unit 100 to the digital camera 200. That is, in the color measurement system 1 configured by the digital camera 200 to which the light shielding unit 100 according to the present embodiment is attached, the illumination conditions of the object 900 for color measurement and the chart 130 of the reference color are equalized once. It can be taken. In addition, since the light shielding unit 100 has a simple structure in which the chart 130 is provided inside the light shielding portion 110, the tip of the light shielding unit 100 that needs to be brought close to the object 900 for color measurement becomes compact. Handling of the color measurement system 1 is facilitated.

[Example of color measurement target being teeth]
Although the object of color measurement may be anything, an example in the case of being a tooth will be described as an example. That is, the case where the color measurement system 1 is used to measure the color of teeth will be described.

An example of the case where the light shielding unit 100 has the configuration shown in FIG. 9 is shown in FIG. The subject opens the mouth, and the measurer places the opening 113 of the light shielding unit 100 on a tooth which is a color measurement object to perform imaging. FIG. 16 schematically shows the upper teeth 912 and the upper gums 914, and the lower teeth 922 and the lower gums 924. In the example shown in FIG. 16, the teeth 912 of the upper jaw are disposed near the center of the opening 113. In this example, the teeth 912 of the upper jaw and the chart 130 are illuminated by the illumination light emitted from the emission unit 120 including the first emission unit 121 and the second emission unit 122. The digital camera 200 captures the illuminated upper teeth 912 and the chart 130, and obtains an image in which the upper teeth 912 and the chart 130 appear. The digital camera 200 or an image analysis device that has acquired imaging data analyzes the color of the upper jaw teeth 912 based on the upper jaw teeth 912 and the chart 130 obtained by imaging.

An example of the case where the light shielding unit 100 has the configuration shown in FIG. 11 is shown in FIG. The subject opens the mouth, and the measurer places the light shielding unit 100 of the color measurement system 1 so that the tip of the teeth 912 of the upper jaw is applied to the protrusion 150. As a result, using the digital camera 200, the maxillary teeth 912 and the chart 130 can be photographed simultaneously.

The protrusion 150 is disposed on the tip side of the teeth 912 of the upper jaw, and the protrusion 150 or the like does not exist on the gum 914 side of the upper jaw. That is, since the light shielding unit 100 has no structure at a position where the light shielding unit 100 collides with the gums 914 of the upper jaw, there is a space, so the light shielding unit 100 is easy to use.

When performing measurement of the lower jaw 922, the measurer rotates the light shielding unit 100 around the lens unit 202 of the digital camera 200 from the state shown in FIG. As a result, as shown in FIG. 18, the protrusion 150 is disposed on the upper side. By arranging the light shielding unit 100 of the color measurement system 1 so that the tips of the lower jaw teeth 922 are in contact with the protrusion 150, the lower jaw teeth 922 and the chart 130 can be simultaneously photographed using the digital camera 200. Of course, the digital camera 200, the lens unit 202, and the light shielding unit 100 may be reversed as a set.

FIG. 19 shows a configuration in which the light shielding unit 100 has the projecting portion 150 as shown in FIG. 11 and the arrangement surface 116 is closer to the photographing lens 210 than the surface provided with the opening 113 as shown in FIG. An example of the case is shown. Also in this case, the subject opens the mouth, and the measurer arranges the light shielding unit 100 of the color measurement system 1 so that the tip of the teeth 912 of the upper jaw contacts the protrusion 150. As a result, using the digital camera 200, the maxillary teeth 912 and the chart 130 can be photographed simultaneously.

Generally, when the color measurement of the teeth in the subject's mouth is performed, the periphery of the opening 113 is easily soiled. In the example shown in FIG. 19, since the arrangement surface 116 on which the chart 130 is disposed is inside the opening 113, the chart 130 is not easily soiled. Further, in the example shown in FIG. 19, since the tip of the light shielding unit 100 is thin, the light shielding unit 100 can be easily disposed in the mouth of the subject.

FIG. 20 shows a configuration in which the light shielding unit 100 has the protrusion 150 as shown in FIG. 11 and the arrangement surface 116 is inclined toward the photographing lens 210 from the surface of the opening 113 as shown in FIG. An example of Also in this case, the subject opens the mouth, and the measurer arranges the light shielding unit 100 of the color measurement system 1 so that the tip of the teeth 912 of the upper jaw contacts the protrusion 150. As a result, using the digital camera 200, the maxillary teeth 912 and the chart 130 can be photographed simultaneously. In the example shown in FIG. 20, since the tip of the light shielding unit 100 is thin, the light shielding unit 100 is easily disposed in the mouth of the subject.

FIG. 21 shows a configuration in which the light shielding unit 100 has a projecting portion 150 as shown in FIG. 11, and the arrangement surface 116 is inclined from the surface of the opening 113 to the side away from the taking lens 210 as shown in FIG. An example of the case is shown. Also in this case, the subject opens the mouth, and the measurer arranges the light shielding unit 100 of the color measurement system 1 so that the tip of the teeth 912 of the upper jaw contacts the protrusion 150. As a result, using the digital camera 200, the maxillary teeth 912 and the chart 130 can be photographed simultaneously. In the example shown in FIG. 21, since the arrangement surface 116 on which the chart 130 is disposed is at a position where it is hidden from the opening 113, the chart 130 is not easily soiled.

As described above, the color measurement system 1 can be used, for example, for color measurement of teeth. Not limited to the teeth, the color measurement system 1 may be used for color measurement of various objects. Depending on the object, the shape of the light shielding portion 110 and the arrangement of the chart 130 may be changed as appropriate. However, it is preferable that the chart 130 be disposed in a central region corresponding to a position between the first emission portion 121 and the second emission portion 122 from which the illumination light is emitted.

In the above-mentioned embodiment, although the case where the injection | emission part 120 was two was mentioned as the example and demonstrated, the number of injection | emission parts may be how many. It is preferable that the illumination light be irradiated so as to be symmetrical with respect to the object of color measurement and the chart 130.

Claims

When mounted so as to cover the imaging optical system of the imaging apparatus, it is configured to block external light from entering the imaging optical system, and an aperture is provided at a position including the optical axis of the imaging optical system A light shield,
When an axis perpendicular to the optical axis is a first axis and a plane including the optical axis and the first axis is a first surface, the first surface inside the light shielding portion is sandwiched. A first emitting portion and a second emitting portion provided on both sides, each configured to emit illumination light in the direction of the opening;
The reference color chart disposed on the inner side of the light shielding portion, wherein the central portion of the opening is projected on a plane perpendicular to the optical axis and moved in a direction parallel to the first axis. A light shielding unit comprising: a reference color chart in which at least a part of the reference color chart is disposed in the central area, where the area illuminated with the illumination light is a central area.
The illumination light emitted from the first emission unit is specularly reflected by the first regular reflection area of the object disposed in the opening, enters the photographing optical system, and is emitted from the second emission unit. When the illumination light is specularly reflected by the second regular reflection area of the object and enters the photographing optical system, the central area in which at least a part of the reference color chart is disposed is the first area. Each of the specular reflection area and the second specular reflection area projected onto the plane including the central area, and including at least a part between two areas extending in a direction parallel to the first axis; The light shielding unit according to claim 1.
When a plane including the midpoint between the first ejection portion and the second ejection portion and parallel to the first surface is a second surface,
The central region in which at least a portion of the reference color chart is disposed intersects the second surface,
The light shielding unit according to claim 1.
The light shielding unit according to any one of claims 1 to 3, wherein the first light emitting portion and the second light emitting portion are arranged symmetrically with respect to the first surface.
A plane perpendicular to the first axis and passing through the center of gravity of the opening is a third plane.
When one of the spaces divided by the third surface is the first side,
The light shielding unit further includes a protrusion provided on the first side and the outer side of the light shielding unit so as to protrude in the direction of the optical axis,
The reference color chart is provided on the first side,
The light shielding unit according to any one of claims 1 to 4.
The reference color chart according to any one of claims 1 to 5, wherein the reference color chart is arranged on the side where the photographing optical system exists relative to the surface formed by the opening in the direction along the optical axis. Shading unit described.
When an axis perpendicular to the optical axis and the first axis is a second axis,
The light shielding unit according to any one of claims 1 to 6, wherein the width of the opening in the direction along the second axis is larger than the width of the opening in the direction along the first axis. .
8. The reference color chart according to claim 1, wherein the reference color chart is disposed so that the side far from the optical axis is closer to the photographing optical system with respect to the direction along the optical axis than the side closer to the optical axis. The light shielding unit according to any one of the above.
8. The reference color chart according to claim 1, wherein the reference color chart is disposed so that the side closer to the optical axis is closer to the photographing optical system with respect to the direction along the optical axis than the side farther from the optical axis. The light shielding unit according to any one of the above.
The mounting portion for fixing the light shielding unit such that the first axis is parallel to a long side or a short side of a rectangular imaging device included in the imaging device. Shading unit described in.
The light shielding unit according to claim 10, wherein the mounting portion is configured to be detachably mounted to the imaging device.