Visual inspection device for die-cast products

Abstract

Even when a configuration is adopted in which the illumination unit directly illuminates the image to avoid increasing the overall size of the device, the occurrence of halation in the captured image is suppressed. [Solution] The inspection device 10 includes a plurality of bar-type lights 18 that illuminate a die-cast product 60 placed on a stage with illumination light from the surroundings, a robotic arm 12 that sequentially moves a first camera 16 to a plurality of imaging points for imaging different parts of the die-cast product 60 placed on the stage, a storage 36 that stores a first dimming value determined for each imaging point so that halation does not occur in the captured image, and a controller 28 that controls the amount of illumination light from the bar-type lights 18 based on the corresponding first dimming value when the first camera 16 is positioned at each imaging point, and then causes the first camera 16 to image the die-cast product 60.

Description

Technical Field

[0001] The present disclosure relates to an appearance inspection apparatus for die-cast products.

Background Art

[0002] There is described a casting defect tendency management apparatus that images an appearance feature part on the surface of a casting illuminated by a lighting device, quantifies the amount of recesses generated in the appearance feature part by image processing the captured image, and estimates the amount of casting defects generated inside the casting based on the relationship between the amount of recesses generated and the amount of casting defects generated inside the casting.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When performing an appearance inspection of a die-cast product using a camera, it is required to illuminate the surface of the product uniformly (illuminate so that there is no halation and no part with insufficient luminance), and thus a configuration that performs indirect lighting is often used as the lighting device. However, when the product to be inspected is a gigacast product, etc., the product is large and the shape is complicated. For this reason, when adopting a lighting device that performs indirect lighting, the irradiation distance from the light source to the product becomes long, the amount of light is insufficient due to attenuation, and the entire device becomes large. Further, when adopting a lighting device that performs direct lighting, there is a problem that halation may occur in the captured image.

[0005] The present disclosure has been made in consideration of the above facts, and an object is to obtain an appearance inspection apparatus for die-cast products that can suppress the occurrence of halation in a captured image even when adopting a configuration that performs direct lighting in order to avoid an increase in the size of the entire apparatus.

Means for Solving the Problems

[0006] An appearance inspection apparatus for die-cast products according to the first embodiment includes: a first illumination unit that irradiates illumination light onto a die-cast product placed on a mounting table from the surroundings; a moving unit that sequentially moves an imaging unit to a plurality of imaging points for imaging different parts of the die-cast product placed on the mounting table; a storage unit that stores a first dimming value determined for each imaging point so as not to cause halation in the captured image; and a control unit that, while the imaging unit is positioned at each imaging point, controls the amount of illumination light from the first illumination unit based on the corresponding first dimming value stored in the storage unit, and then causes the imaging unit to image the die-cast product.

[0007] In the first embodiment, a first dimming value is set for each imaging point of the imaging unit to prevent halation in the captured image. The control unit then controls the amount of illumination light from the first illumination unit based on the corresponding first dimming value while the imaging unit is positioned at each imaging point, and then causes the imaging unit to image the die-cast product. In this way, in the first embodiment, the amount of illumination light from the first illumination unit is controlled for each imaging point to prevent halation in the captured image. Therefore, even when a configuration is adopted in which direct illumination is performed as the first illumination unit to avoid increasing the overall size of the device, halation in the captured image can be suppressed.

[0008] A second embodiment further includes, in the first embodiment, a second illumination unit which is moved together with the imaging unit to each imaging point by the moving unit, wherein the storage unit stores a plurality of second illumination values, each determined so as to be dimmable values ​​of the second illumination unit at a specific imaging point for imaging the recess of the die-cast product, such that halation does not occur in areas of the captured image corresponding to different parts of the recess, and the control unit controls the amount of illumination light from the second illumination unit and causes the imaging unit to image the recess multiple times using each of the plurality of second illumination values, while the imaging unit and the second illumination unit are located at the specific imaging point.

[0009] For example, if the die-cast product to be inspected is a gigacast product, the shape becomes complex, and the opening area and depth of recesses on the surface become larger. As a result, the illumination light from the first illumination unit may not reach the recesses sufficiently, potentially resulting in uneven brightness within the recesses. In contrast, the second embodiment includes a second illumination unit that moves with the imaging unit to each imaging point. Furthermore, multiple second illumination values ​​are defined for the second illumination unit at specific imaging points for imaging the recesses of the die-cast product, so as to prevent halation in areas corresponding to different parts of the recess in the captured image. The control unit then controls the amount of illumination light from the second illumination unit while the imaging unit and the second illumination unit are positioned at the specific imaging point, and performs this process multiple times using each of the multiple second illumination values ​​to cause the imaging unit to image the recesses. This makes it possible to obtain multiple images in which different parts of the recess are properly captured during multiple imaging at the specific imaging point, and to properly image each part of the recess of the product.

[0010] A third aspect is that, in the second aspect, the plurality of second exposure values ​​are determined so as not to cause halation in the region corresponding to the bottom of the recess in the captured image, and second exposure values ​​determined so as not to cause halation in the region corresponding to the side of the recess in the captured image.

[0011] In the recesses of die-cast products, the appropriate illumination level often differs significantly between the bottom and sides of the recess. In contrast, the third embodiment uses a set of second dimming values, one for preventing halation in the area corresponding to the bottom of the recess in the captured image, and another for preventing halation in the area corresponding to the sides of the recess in the captured image. This allows for obtaining images with properly captured bottom and sides of the recess by taking two images at a specific imaging point, thereby reducing the number of images taken.

[0012] A fourth aspect is that, in the first aspect, the die-cast product is a gigacast product manufactured by gigacasting.

[0013] According to the fourth aspect, each part of a large and complexly shaped Gigacast product can be properly imaged without causing halation. [Effects of the Invention]

[0014] This disclosure has the effect of suppressing halation in captured images even when a configuration using direct illumination is adopted to avoid increasing the overall size of the device. [Brief explanation of the drawing]

[0015] [Figure 1] This is a block diagram showing a schematic configuration of a visual inspection apparatus for die-cast products according to an embodiment. [Figure 2] This is a perspective view showing a robotic arm, bar-type lighting, and other components. [Figure 3] This is a side view showing the configuration of the tip of a robot arm. [Figure 4] (A) is an oblique view and (B) is a side view showing the ring-shaped light positioned close to the recess of the product. [Figure 5] This is a diagram showing an example of an imaging point and illumination light intensity table. [Figure 6] This flowchart shows an example of lighting and imaging control processing performed by the controller. [Modes for carrying out the invention]

[0016] Hereinafter, an example of an embodiment of the present disclosure will be described in detail with reference to the drawings. FIG. 1 shows an appearance inspection apparatus 10 for die-cast products according to this embodiment (hereinafter simply referred to as "inspection apparatus 10"). The inspection apparatus 10 is an apparatus that images a die-cast product 60 (an example is shown in FIG. 4) from a plurality of different imaging points and determines the presence or absence of defects on the surface of the die-cast product 60 based on the captured images, and includes a robot arm 12, a first camera 16, and a controller 28.

[0017] Note that the die-cast product 60 to be inspected by the inspection apparatus 10 may be, for example, a gigacast product such as a vehicle skeleton in which a wheel arch and a side member part are integrally formed by gigacasting, or a normal die-cast product such as a transmission case housing.

[0018] As shown in FIG. 2, the robot arm 12 is composed of a vertically articulated robot, includes a plurality of actuators 14 for moving each joint, and is connected to the controller 28. The robot arm 12 is installed near a stage 50 on which the die-cast product 60 to be inspected is placed, and a first camera 16 is attached to the tip (see FIG. 3). According to an instruction from the controller 28, the tip of the robot arm 12, that is, the first camera 16 (and a second camera 22 and a ring-shaped illumination 24 described later) is sequentially moved to a plurality of preset imaging points. The robot arm 12 is an example of a moving part in the present disclosure, and the stage 50 is an example of a mounting table in the present disclosure.

[0019] The first camera 16 is connected to the controller 28 and is controlled by the controller 28 to image the die-cast product 60 on the stage 50 each time it is moved to an individual imaging point by the robot arm 12. The captured image obtained by the first camera 16 performing imaging is output to the controller 28. Note that the first camera 16 is a wide-angle camera that can image a wider range than the second camera 22 described later. The first camera 16 is an example of an imaging part in the present disclosure.

[0020] Also, as shown in FIG. 2, a frame 52 is provided around the stage 50 so as to surround the stage 50 and the robot arm 12, and a plurality of bar-shaped illuminations 18 are attached to the frame 52. When the plurality of bar-shaped illuminations 18 are lit, illumination light is irradiated from the surroundings to the die-cast product 60 to be inspected placed on the stage 50. Further, the plurality of bar-shaped illuminations 18 are connected to the controller 28 via the illumination controller 20. Note that the bar-shaped illumination 18 may be configured to illuminate the die-cast product 60 with indirect light or may be configured to illuminate the die-cast product 60 with direct light.

[0021] In the present embodiment, a first dimming value is determined for each imaging point and for each individual bar-shaped illumination 18 so that no halation occurs in the captured image in the imaging by the first camera 16 at each imaging point. Each time the first camera 16 is moved to an individual imaging point, the light amount of the illumination light from each individual bar-shaped illumination 18 is individually controlled based on the first dimming value. The plurality of bar-shaped illuminations 18 are an example of the first illumination unit in the present disclosure.

[0022] Also, a ring-shaped illumination 24 for illuminating the inside of the concave portion 62 (an example is shown in FIG. 4(B)) where the surface of the die-cast product 60 is concave is connected to the controller 28 via the illumination controller 26, and a second camera 22 for illuminating the inside of the concave portion 62 is connected. As shown in FIG. 3, the second camera 22 and the ring-shaped illumination 24 are attached to the tip of the robot arm 12 so as to be coaxial, and together with the first camera 16, they are sequentially moved to each imaging point by the robot arm 12. The ring-shaped illumination 24 is an example of the second illumination unit in the present disclosure, and the second camera 22 is also an example of the imaging unit in the present disclosure.

[0023] In this embodiment, among the multiple imaging points, there is a specific imaging point set to be close to the recess 62 in order to image the inside of the recess 62 of the die-cast product 60. Figures 4(A) and (B) show an example of the state in which the second camera 22 and the ring-shaped illumination 24 are positioned at the specific imaging point.

[0024] In this embodiment, for a specific imaging point used to image the inside of the recess 62, a second dimming value for the bottom 62A (see Figure 4(B)) of the recess 62 and a second dimming value for the side 62B (see Figure 4(B)) of the recess 62 are set. The second dimming value for the bottom 62A of the recess 62 is set so that when imaging by the second camera 22, halation does not occur in the region of the captured image corresponding to the bottom 62A of the recess 62. The second dimming value for the side 62B of the recess 62 is set so that when imaging by the second camera 22, halation does not occur in the region of the captured image corresponding to the side 62B of the recess 62.

[0025] The ring-shaped illumination 24 is turned on by the controller 28 when it is moved to a specific imaging point by the robot arm 12. The ring-shaped illumination 24 then undergoes two-stage dimming, where the amount of illumination light is controlled based on a second dimming value for the bottom 62A of the recess 62, and then based on a second dimming value for the side 62B of the recess 62. The second camera 22 is controlled by the controller 28 to image the inside of the recess 62 in the first state, when the ring-shaped illumination 24 is dimmed for the bottom 62A of the recess 62, and in the second state, when the ring-shaped illumination 24 is dimmed for the side 62B of the recess 62. The images obtained by the second camera 22 are output to the controller 28.

[0026] The controller 28 includes a CPU (Central Processing Unit) 30, ROM (Read Only Memory) 32, RAM (Random Access Memory) 34, storage 36 such as an HDD (Hard Disk Drive) or SSD (Solid State Drive), a communication I / F (Interface) 38, and an I / F 40, which are interconnected via a bus 42.

[0027] The storage 36 stores an imaging point / illumination intensity table 44. As shown in Figure 5, the imaging point / illumination intensity table 44 registers imaging point information for moving the tip of the robot arm 12 to each imaging point, and a two-stage dimming flag indicating whether each imaging point is a specific imaging point that performs two-stage dimming to image the inside of the recess 62. The imaging point / illumination intensity table 44 also registers the first dimming value for each bar-type illumination 18 for normal imaging points where the two-stage dimming flag is set to 0. Furthermore, the imaging point / illumination intensity table 44 registers the second dimming value for the bottom and the second dimming value for the side of the ring-type illumination 24 for specific imaging points where the two-stage dimming flag is set to 1.

[0028] In this embodiment, the first dimming value registered in the imaging point / illumination light intensity table 44 is set as follows. Specifically, the first camera 16 is moved to the normal imaging point, and with multiple bar-type lights 18 each lit at predetermined dimming values, the die-cast product 60 is imaged by the first camera 16. Next, the operator observes the inspection area corresponding to the part of the die-cast product 60 to be inspected from the image obtained by the first camera 16, and determines whether there is no halation in the inspection area and whether the brightness of the inspection area is sufficient. If halation occurs in the inspection area, the illumination light intensity from the specific bar-type light 18 illuminating the part to be inspected is reduced, while if the brightness of the inspection area is insufficient, the illumination light intensity from the specific bar-type light 18 is increased, and the first camera 16 is made to re-image. Furthermore, the dimming values ​​for each bar-type light 18 when it is determined that there is no halation in the inspection area and the brightness of the inspection area is sufficient are saved as the first dimming value corresponding to the current imaging point. By performing the above steps sequentially on the normal imaging points, a first dimming value can be obtained for each normal imaging point and for each individual bar-type illumination 18.

[0029] Furthermore, in this embodiment, the second dimming value registered in the imaging point / illumination light intensity table 44 is set as follows. That is, the second camera 22 is moved to a specific imaging point, and with the ring-shaped illumination 24 lit at a predetermined dimming value, the second camera 22 is made to image the inside of the recess 62 of the die-cast product 60. Next, the operator observes the inspection area corresponding to the bottom of the recess 62 of the die-cast product 60 from the image obtained by imaging with the second camera 22, and determines whether there is no halation in the inspection area and whether the brightness of the inspection area is sufficient. If halation occurs in the inspection area, the illumination light intensity from the ring-shaped illumination 24 is reduced, while if the brightness of the inspection area is insufficient, the illumination light intensity from the ring-shaped illumination 24 is increased, and the second camera 22 is made to re-image. In addition, the dimming value for the ring-shaped illumination 24 when it is determined that there is no halation in the inspection area and the brightness of the inspection area is sufficient is saved as the second dimming value for the bottom of the recess 62 corresponding to the current specific imaging point.

[0030] Next, with the ring-shaped light 24 illuminated at a predetermined dimming value, the second camera 22 is used to image the inside of the recess 62 of the die-cast product 60. Then, the operator observes the inspection area corresponding to the side of the recess 62 of the die-cast product 60 from the image obtained by the second camera 22 and determines whether there is no halation in the inspection area and whether the brightness of the inspection area is sufficient. If halation occurs in the inspection area, the amount of illumination from the ring-shaped light 24 is reduced, while if the brightness of the inspection area is insufficient, the amount of illumination from the ring-shaped light 24 is increased, and the second camera 22 is used to re-image the area. In addition, the dimming value for the ring-shaped light 24 when it is determined that there is no halation in the inspection area and the brightness of the inspection area is sufficient is saved as the second dimming value for the side of the recess 62 corresponding to the current specific imaging point.

[0031] Furthermore, a defect inspection device 46 is connected to the controller 28, and images captured by the first camera 16 or the second camera 22 are transmitted from the controller 28 to the defect inspection device 46. The defect inspection device 46 uses AI (Artificial Intelligence) that has been pre-trained on multiple defect images of parts of the die-cast product 60 where defects appear on the surface, to determine whether or not defects are present in the image received from the controller 28. Alternatively, a bypass circuit may be provided to directly connect the first camera 16 and the second camera 22 to the defect inspection device 46, so that images captured by the first camera 16 or the second camera 22 are transmitted directly to the defect inspection device 46 without going through the controller 28.

[0032] Next, as an example of the operation of this embodiment, the lighting and imaging control processing performed by the controller 28 when inspecting the die-cast product 60 will be described with reference to Figure 6. In step 100 of the lighting and imaging control processing, the controller 28 reads the imaging point information registered as the first entry in the imaging point / illumination light intensity table 44. Then, by driving the actuator 14 based on the read imaging point information, the tip of the robot arm 12 is moved to the imaging point corresponding to the read imaging point information.

[0033] In step 102, the controller 28 determines whether the imaging point where the tip of the robot arm 12 is currently located (the current imaging point) is a specific imaging point where two-stage dimming should be performed to image the inside of the recess 62. This determination in step 102 can be achieved, for example, by determining whether the two-stage dimming flag corresponding to the imaging point information read out in step 100 is 1.

[0034] If the determination in step 102 is rejected, the process proceeds to step 104, in which the controller 28 reads the first dimming value corresponding to the current imaging point from the imaging point / illumination light intensity table 44. In step 106, the controller 28 controls each of the bar-type lights 18 via the illumination controller 20 so that the amount of illumination light from each of the bar-type lights 18 corresponds to the amount of light read in step 104. In step 108, the controller 28 causes the first camera 16 to image the die-cast product 60. In step 110, the controller 28 transmits the image captured by the first camera 16 to the defect inspection device 46 and proceeds to step 126.

[0035] Furthermore, if the determination in step 102 is affirmative, the process proceeds to step 112. In step 112, the controller 28 reads a second dimming value for the bottom 62A of the recess 62 corresponding to the current imaging point from the imaging point / illumination light intensity table 44. In step 114, the controller 28 controls the ring-shaped illumination 24 via the illumination controller 26 so that the amount of illumination light emitted from the ring-shaped illumination 24 corresponds to the light intensity corresponding to the second dimming value for the bottom 62A. Then, in step 116, the controller 28 causes the second camera 22 to image the inside of the recess 62 of the die-cast product 60. In this imaging in step 116, the image is captured so that the area corresponding to the bottom 62A of the recess 62 has the appropriate brightness. In step 117, the controller 28 transmits the image of the inside of the recess 62 captured in step 116 to the defect inspection device 46. Furthermore, the defect inspection device 46, which receives the captured image, inspects the image captured in step 116 for defects in the area corresponding to the bottom 62A within the recess 62.

[0036] Furthermore, in the next step 118, the controller 28 reads a second dimming value for the side portion 62B within the recess 62 corresponding to the current imaging point from the imaging point illumination light intensity table 44. In step 120, the controller 28 controls the ring-shaped illumination 24 via the illumination controller 26 so that the amount of illumination light from the ring-shaped illumination 24 corresponds to the amount of light corresponding to the second dimming value for the side portion 62B. Also, in step 122, the controller 28 causes the second camera 22 to image the inside of the recess 62 of the die-cast product 60. In this imaging in step 122, the image is captured so that the area corresponding to the side portion 62B within the recess 62 has an appropriate brightness.

[0037] Then, in step 124, the controller 28 transmits the image of the recess 62 captured in step 122 to the defect inspection device 46 and proceeds to step 126. The defect inspection device 46, upon receiving the image, inspects the image captured in step 122 for defects in the area corresponding to the side portion 62B of the recess 62.

[0038] In step 126, the controller 28 determines whether imaging has been performed at all imaging points for which information is registered in the imaging point / illumination intensity table 44. If the determination in step 126 is negative, the process returns to step 100, and steps 100 to 126 are repeated until the determination in step 126 is positive. As a result, the information registered from the second entry onward in the imaging point / illumination intensity table 44 is read sequentially, and the dimming and imaging described above are performed sequentially. When the determination in step 126 is positive, the illumination / imaging control process ends.

[0039] Thus, in this embodiment, the inspection apparatus 10 includes a plurality of bar-type lights 18 that illuminate the die-cast product 60 placed on the stage 50 with illumination light from the surroundings, a robot arm 12 that sequentially moves the first camera 16 to a plurality of imaging points for imaging different parts of the die-cast product 60 placed on the stage 50, a storage 36 that stores a first dimming value determined for each imaging point to prevent halation in the captured image, and a controller 28 that, when the first camera 16 is positioned at each imaging point, controls the amount of illumination light from the bar-type lights 18 based on the corresponding first dimming value stored in the storage 36, and then causes the first camera 16 to image the die-cast product 60. As a result, even when a configuration is adopted in which the bar-type lights 18 directly illuminate the product in order to avoid increasing the overall size of the inspection apparatus 10, halation in the captured image can be suppressed.

[0040] Furthermore, in this embodiment, a ring-shaped illuminator 24 is moved to each imaging point together with the first camera 16 and the second camera 22 by the robot arm 12. The storage 36 stores a plurality of second dimming values, each determined so as dimming values ​​for the second illuminator at a specific imaging point for imaging the inside of a recess 62 in the die-cast product 60, so as not to cause halation in areas corresponding to different parts of the recess 62 in the captured image. The controller 28 controls the amount of illumination light from the ring-shaped illuminator 24 while the second camera 22 and the ring-shaped illuminator 24 are positioned at the specific imaging point, and causes the second camera 22 to image the inside of the recess 62, performing this multiple times using each of the plurality of second dimming values. As a result, multiple images can be obtained in which different parts of the recess 62 are properly captured during multiple imaging at the specific imaging point, and each part of the recess of the product can be properly captured.

[0041] Furthermore, in this embodiment, the multiple second exposure values ​​are determined so that halation does not occur in the region corresponding to the bottom 62A of the recess 62 in the captured image, and second exposure values ​​determined so that halation does not occur in the region corresponding to the side 62B of the recess 62 in the captured image. As a result, by taking two images at a specific imaging point, it is possible to obtain an image in which the bottom 62A of the recess 62 is properly captured and an image in which the side 62B of the recess 62 is properly captured, thereby reducing the number of images taken.

[0042] In the above embodiment, a configuration was described in which a first camera 16 used for imaging at normal imaging points and a second camera 22 used for imaging at specific imaging points (imaging within the recess 62) were provided. However, this disclosure is not limited thereto, and a single camera with a changeable imaging field of view may be provided, and the imaging field of view may be switched between imaging at normal imaging points and imaging at specific imaging points.

[0043] Furthermore, in the above embodiment, the amount of illumination light from the bar-type illumination 18 when imaging at a specific imaging point using the second camera 22 and the ring-type illumination 24 is not specifically described. However, depending on the direction and shape of the recess to be imaged, the amount of illumination light from the bar-type illumination 18 may affect imaging at the specific imaging point. Considering this, it is preferable to define and store a first dimming value for each specific imaging point, and when imaging at a specific imaging point using the second camera 22 and the ring-type illumination 24, to control the amount of illumination light from the bar-type illumination 18 based on the corresponding first dimming value.

[0044] Furthermore, although the above embodiment describes an embodiment in which the controller 28 is configured as a computer, this disclosure is not limited thereto, and the controller 28 may be configured as, for example, a PLC (Programmable Logic Controller). Also, although the above embodiment describes an embodiment in which the imaging point / illumination light intensity table 44, in which imaging point information, dimming values, etc. are registered, is stored in the storage 36 of the controller 28, this disclosure is not limited thereto. For example, the robot arm 12 usually has a built-in control unit, and the imaging point information, dimming values, etc. may be stored in the storage unit built into the control unit. [Explanation of symbols]

[0045] 10. Visual inspection device for die-cast products 12. Robot arm (mobile part) 16. First camera (imaging unit) 18. Bar-type lighting (first lighting section) 22. Second camera (IMAGING section) 24. Ring-shaped lighting (second lighting section) 28 Controller (Control Unit) 36. Storage (memory unit) 60 die-cast products 62 recesses 62A bottom 62B Side

Claims

1. A first lighting unit that illuminates the die-cast product placed on a mounting platform with illumination light from the surroundings, A moving unit moves the imaging unit sequentially to multiple imaging points for imaging different parts of the die-cast product placed on the aforementioned stand, A storage unit that stores a first exposure control value determined for each imaging point to prevent halation in the captured image, With the imaging unit positioned at each imaging point, the control unit controls the amount of illumination light from the first illumination unit based on the corresponding first dimming value stored in the memory unit, and then causes the imaging unit to image the die-cast product. A visual inspection device for die-cast products, including those with die-cast finishes.

2. The system further includes a second illumination unit which is moved together with the imaging unit to each imaging point by the moving unit, The memory unit stores a plurality of second dimming values, each determined so as dimming values ​​for the second illumination unit at a specific imaging point for imaging the recess of the die-cast product, such that halation does not occur in regions of the captured image that correspond to different parts of the recess. The control unit controls the amount of illumination light from the second illumination unit and causes the imaging unit to image the recessed area multiple times using each of the multiple second dimming values, while the imaging unit and the second illumination unit are positioned at the specific imaging point. Apparatus for visual inspection of die-cast products as described in claim 1.

3. The appearance inspection apparatus for die-cast products according to claim 2, wherein the plurality of second dimming values ​​are second dimming values ​​determined so as not to cause halation in the region corresponding to the bottom of the recess in the captured image, and second dimming values ​​determined so as not to cause halation in the region corresponding to the side of the recess in the captured image.

4. The die-cast product is a Gigacast product manufactured by Gigacasting, as described in claim 1.

Images