JP2017118386A - Image acquisition system and image acquisition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image acquisition system capable of acquiring a plurality of images that can be easily stitched.SOLUTION: The image acquisition system includes: an irradiation device 10 for affixing a pattern of a predetermined pattern to a surface of a building B by irradiating the building B with light; and a camera 30 for photographing the surface of the building B to which the pattern of the predetermined pattern is affixed by dividing into a plurality of portions.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a technique of an image acquisition system and an image acquisition method for acquiring an image by photographing an object.

  2. Description of the Related Art Conventionally, techniques of an image acquisition system and an image acquisition method for acquiring an image by photographing a target object are known. For example, as described in Patent Document 1.

  Patent Document 1 discloses a technique for photographing a wall surface of a surge tank with an observation unit (monitor video camera) attached to a balloon. In this technique, an image taken by the observation unit is displayed on a monitor, and the wall surface of the surge tank can be inspected by viewing this display.

  In such a technique, since the inspection is performed while photographing the wall surface, if the inspection work takes a long time, the balloon will continue to fly for a long time. ) And the like may occur.

  Therefore, in order to shorten the flight time of the balloon, a method of first inspecting the wall surface by taking an image of the entire wall surface using the balloon and then confirming the image can be considered. In this case, since the inspection is not performed during the flight of the balloon, the flight time of the balloon can be shortened.

  Further, when the wall surface image is captured in this way, if the wall surface is large to some extent, a method of capturing the entire wall surface by capturing the wall surface one by one and connecting a plurality of captured images is conceivable.

  However, when the pattern of the wall surface is uniform and there is no conspicuous feature, the positional relationship between the images is unclear, and it is difficult to accurately connect a plurality of images.

JP-A-6-123910

  The present invention has been made in view of the situation as described above, and a problem to be solved is to provide an image acquisition system and an image acquisition method capable of acquiring a plurality of images that are easily connected. .

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, by irradiating the object with light, an irradiation unit for attaching a pattern of a predetermined pattern to the surface of the object, and the object having the pattern of the predetermined pattern And an imaging unit that shoots the surface by dividing the surface into a plurality of locations.

  According to a second aspect of the present invention, the imaging unit is provided, and further includes a movable body that is movable, and a control unit that controls movement of the movable body.

  In the present invention, the moving body is an unmanned aerial vehicle.

  According to a fourth aspect of the present invention, the irradiating unit is capable of attaching a pattern of one pattern and another pattern different from the one pattern to the surface of the object.

  According to a fifth aspect of the present invention, the image processing apparatus further includes a combination processing unit that joins the plurality of images based on the patterns in the plurality of images captured by the imaging unit.

  In Claim 6, by irradiating light to a target object, the irradiation process which attaches | subjects the pattern of a predetermined pattern to the surface of the said target object, and the said object to which the pattern of the said predetermined pattern was attached | subjected in the said irradiation process And a photographing step of photographing the surface of the object in a plurality of locations.

  According to a seventh aspect of the present invention, the image processing method further includes a joining process step of joining the plurality of images based on the patterns in the plurality of images photographed in the photographing step.

  In Claim 8, the said irradiation process attaches the pattern of one pattern on the surface of the said target object, and the pattern of the other pattern different from said one pattern on the surface of the said target object A first irradiation step, wherein the photographing step shoots the surface of the object on which the pattern of the one pattern is attached in the first irradiation step in a plurality of locations. And a second imaging step of imaging the surface of the object to which the pattern of the other pattern is attached in the second irradiation step in a plurality of locations, and the combination processing step A first combination processing step of joining the plurality of images to obtain a first combined image based on the patterns in the plurality of images photographed in the first photographing step; and the second photographing. Before multiple images taken during the process A second combined processing step of connecting the plurality of images based on a pattern to obtain a second combined image, and based on the first combined image and the second combined image, And a noise reduction processing step for obtaining one complementary image in which the pattern of the pattern and the pattern of the other pattern are reduced.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, a plurality of images that can be easily joined can be acquired.

  According to the second aspect, it is possible to easily photograph the object.

  According to the third aspect of the present invention, it is possible to more easily capture an object.

  According to the fourth aspect of the present invention, it is possible to easily acquire an image with a reduced pattern.

  According to the fifth aspect of the present invention, it is possible to reduce the work burden for joining the images.

  According to the sixth aspect of the present invention, it is possible to acquire a plurality of images that are easy to connect.

  According to the seventh aspect of the present invention, it is possible to obtain an image connected with high accuracy.

  According to the eighth aspect of the present invention, it is possible to obtain an image in which the surface of the object can be easily confirmed.

Schematic which showed the whole structure of the inspection system. The flowchart which showed the inspection method. The perspective view which showed the building where the pattern of the 1st pattern was attached | subjected by the irradiation apparatus. The perspective view which showed the mode of imaging | photography with a drone. The front view which showed an example of the area | region to image | photograph. The perspective view which showed the building where the pattern of the 2nd pattern was attached | subjected by the irradiation apparatus. The schematic diagram which showed a mode that two images were connected. The schematic diagram which showed a mode that a noise was reduced by superimposing two images.

  Hereinafter, description will be made by defining the front-rear direction, the left-right direction, and the up-down direction based on the arrows in the figure.

  First, the configuration of an inspection system 1 according to an embodiment of an image acquisition system according to the present invention will be described with reference to FIG. The inspection system 1 is for photographing a target object, acquiring an image of the target object, and inspecting the surface of the target object based on the image. In this embodiment, a relatively large rectangular parallelepiped building B is assumed as an object (see FIG. 3 and the like). The inspection system 1 mainly includes an irradiation device 10, a drone 20, a camera 30, a controller 40, and an image processing device 50.

  The irradiation device 10 irradiates laser light. The irradiation apparatus 10 can irradiate a plurality of laser beams simultaneously. The irradiation apparatus 10 can appropriately change the combination (number, irradiation direction, etc.) of the plurality of laser beams.

  The drone 20 is a small aircraft (small unmanned aerial vehicle) on which a person does not board. The drone 20 includes a plurality of rotors (rotary blades) and can perform stable flight.

  The camera 30 captures an image. The camera 30 is attached to the drone 20.

  The controller 40 controls the operations of the drone 20 and the camera 30. The controller 40 can communicate with the drone 20 and the camera 30 wirelessly. The controller 40 includes an operation unit operated by an operator, and a control unit that generates a control signal based on the operation of the operation unit and transmits the control signal to the drone 20 and the camera 30.

  The operator can arbitrarily fly the drone 20 by operating the controller 40. The operator can take an image with the camera 30 by operating the controller 40.

  The image processing device 50 performs appropriate processing on the image captured by the camera 30. In the present embodiment, a personal computer is used as the image processing apparatus 50. The image processing device 50 can communicate with the camera 30 wirelessly. The image processing apparatus 50 can acquire an image captured by the camera 30 wirelessly.

  Next, an inspection method for inspecting the surface of the building B using the inspection system 1 configured as described above will be described. Note that the inspection method according to the present embodiment includes the image acquisition method according to the present invention. In the present embodiment, a case where the front wall surface of the building B is inspected will be described as an example. Therefore, when simply referred to as “wall surface” in the following description, it means the wall surface on the front side of the building B.

  First, in the first irradiation step S <b> 1 shown in FIG. 2, a plurality of laser beams are irradiated from the irradiation device 10 to the building B.

  Specifically, as illustrated in FIG. 3, the irradiation device 10 is disposed in front of the building B, and a plurality of laser beams are irradiated from the irradiation device 10 to the surface (wall surface) of the building B. At this time, the number and direction of the plurality of laser beams irradiated from the irradiation device 10 are set so as to cover the entire wall surface of the building B. As a result, the wall surface of the building B is given a predetermined pattern by the laser beam.

  In the present embodiment, the “pattern” attached to the wall surface of the building B means a plurality of light points P by a plurality of laser beams. Further, the “predetermined pattern” means the number or positional relationship of the light spots P attached to the wall surface of the building B. The pattern of the pattern attached to the wall surface of the building B in the first irradiation step S1 is hereinafter referred to as “first pattern”.

  When a plurality of laser beams are irradiated from the irradiation device 10 to the building B in the first irradiation step S1, the process proceeds from the first irradiation step S1 to the first photographing step S2, as shown in FIG. In the first photographing step S2, the wall surface of the building B is photographed.

  Specifically, as shown in FIG. 4, the operator operates the controller 40 (see FIG. 1) to control the operations of the drone 20 and the camera 30 and photograph the wall surface of the building B. At this time, in order to take an image that can check the wall surface (check the presence or absence of cracks or the like), it is necessary to take an image by approaching the wall surface of the building B to some extent. For this reason, the whole wall surface of the building B cannot normally be photographed with one image. Therefore, the worker repeats the work of photographing a part of the wall surface, moving the drone 20 a little, and photographing a part different from the part photographed earlier. In this way, the operator shoots the entire wall surface of the building B in a plurality of locations.

  In the present embodiment, as shown in FIG. 4, the wall surface is photographed from the bottom to the top while the drone 20 is folded at the left and right ends of the building B. At this time, the position of the drone 20 (the position taken by the camera 30) is adjusted so that adjacent images partially overlap each other. Specifically, as shown in FIG. 5, the position of the drone 20 is adjusted so that a wall surface area X1 photographed at a certain position partially overlaps with a wall surface area X2 photographed next. At this time, it is desirable that a plurality of light points P exist in the overlapping region.

  The camera 30 transmits the image data to the image processing device 50 every time a wall surface is photographed. The image processing device 50 stores the data of the image.

  When the entire wall surface of the building B is photographed in the first photographing step S2, as shown in FIG. 2, the process proceeds from the first photographing step S2 to the second irradiation step S3. In the first photographing step S2, a plurality of laser beams are irradiated from the irradiation device 10 to the building B.

  Specifically, similarly to the first irradiation step S1, a plurality of laser beams are irradiated from the irradiation device 10 to the wall surface of the building B. Here, the pattern (see FIG. 6) applied to the wall surface of the building B in the second irradiation step S3 is set to be different from the pattern (first pattern) in the first irradiation step S1 (see FIG. 3). Is done. The pattern of the pattern attached to the wall surface of the building B in the second irradiation step S3 is hereinafter referred to as “second pattern”. By setting the number and direction of the laser beams emitted from the irradiation device 10 to be different from those in the first irradiation step S1, a pattern having a second pattern different from the first pattern can be applied to the wall surface.

  When a plurality of laser beams are irradiated from the irradiation device 10 to the building B in the second irradiation step S3, the process proceeds from the second irradiation step S3 to the second photographing step S4 as shown in FIG. In the second photographing step S4, the wall surface of the building B is photographed.

  Note that the content of the second imaging step S4 is substantially the same as that of the first imaging step S2. That is, the operator operates the controller 40 (see FIG. 1) to photograph the entire wall surface of the building B.

  When the entire wall surface of the building B is photographed in the second photographing step S4, the process proceeds from the second photographing step S4 to the first combination processing step S5 as shown in FIG. In the first combination processing step S5, a plurality of images photographed in the first photographing step S2 are connected to form one image.

  Specifically, the image processing device 50 combines a plurality of images captured in the first imaging step S2. Here, FIG. 7 shows a state in which two images (image G1 and image G2) obtained by photographing the region X1 and the region X2 shown in FIG. 5 are combined as an example. In this case, the image processing apparatus 50 may combine the image G1 and the image G2 with reference to the common light point P (light point group PG) captured in both the image G1 and the image G2. it can.

  For example, the image processing apparatus 50 combines the two images (image G1 and image G2) so that the point cloud PG of the light completely matches (overlaps), so that the positional relationship between the two images, the scale, etc. Can be obtained as a single image (combined image G12). If the scales of the two images are different, the scale can be adjusted as appropriate with reference to the light point group PG. In addition, when one of the two images is inclined, the orientation of the image can be adjusted as appropriate while referring to the light point group PG. In this way, the image processing apparatus 50 can obtain a combined image G12 with high accuracy without deviation or the like.

  The image processing apparatus 50 can obtain one image GM1 (see FIG. 8) showing the entire wall surface of the building B by sequentially combining a plurality of images in this way. A light spot P of the first pattern is attached to the wall surface shown in the image GM1.

  In the first combining processing step S5, the image processing apparatus 50 automatically performs processing (image combining) according to a dedicated control program or the like.

  When one image GM1 showing the entire wall surface of the building B is obtained in the first joint processing step S5, the process proceeds from the first joint processing step S5 to the second joint processing step S6 as shown in FIG. In the second combination processing step S6, a plurality of images photographed in the second photographing step S4 are connected to form one image.

  In addition, the content of 2nd joint process process S6 is as substantially the same as 1st joint process process S5. That is, the image processing apparatus 50 can combine a plurality of images captured in the second imaging step S4 to obtain one image GM2 (see FIG. 8). At this time, the image processing apparatus 50 adjusts the scales and orientations of the plurality of images with the light point P as a reference. On the wall surface shown in the image GM2, a light point P of the second pattern is given.

  When one image GM2 showing the entire wall surface of the building B is obtained in the second joint processing step S6, the process proceeds from the second joint processing step S6 to the noise reduction processing step S7 as shown in FIG. In the noise reduction processing step S7, one image with reduced noise is formed based on the images GM1 and GM2.

  The images GM1 and GM2 obtained in the first combining processing step S5 and the second combining processing step S6 are images of the wall surface of the building to which the light spots P having a predetermined pattern are attached. For this reason, if inspection (confirmation of the presence or absence of cracks, etc.) is performed using the image GM1 or the image GM2, the light spot P may become an obstacle (noise), and accurate and quick inspection may be difficult.

  Therefore, in the noise reduction processing step S7, the point P (noise) of the light is reduced using the two images GM1 and GM2. Specifically, as shown in FIG. 8, the image processing apparatus 50 superimposes two images GM1 and GM2 to form one image GM12. At this time, the image processing apparatus 50 supplements the image (the state of the wall surface) of the portion of one image (for example, the image GM1) to which the light point P is attached with the other image (image GM2). As a result, it is possible to obtain an image GM12 of a wall surface that does not have the light point P (or has fewer light points P than the image GM1 and the image GM2).

  In addition, in order to complement the part to which the light point P of one image is attached in this way with the other image, the light point P of the pattern of the first pattern and the light point P of the pattern of the second pattern Is preferably set so as not to overlap as much as possible, and more preferably set so as not to overlap at all.

  In the noise reduction processing step S7, the image processing apparatus 50 automatically performs processing (noise reduction) according to a dedicated control program or the like.

  When the image GM12 is obtained in the noise reduction processing step S7, the process proceeds from the noise reduction processing step S7 to the inspection step S8 as shown in FIG. In the inspection step S8, the wall surface of the building B is inspected using the image GM12.

  Specifically, the worker looks at the wall surface indicated by the image GM12 and confirms whether or not a defect such as a crack has occurred on the wall surface. At this time, since the light spot P is reduced as compared with the image GM1 and the image GM2, the inspection work can be performed more accurately and quickly. Further, by transferring the image GM12, it is possible for an operator at a remote place to perform an inspection operation.

As described above, the inspection system 1 (image acquisition system) according to the present embodiment is
By irradiating the building B (object) with light, an irradiation device 10 (irradiation unit) for applying a predetermined pattern to the surface of the building B;
A camera 30 (imaging unit) that shoots the surface of the building B to which the pattern of the predetermined pattern is attached in a plurality of locations;
It comprises.

With this configuration, it is possible to acquire a plurality of images that are easy to connect.
That is, by photographing the building B with a predetermined pattern, it is possible to connect images based on the pattern. Thereby, a highly accurate image of the building B can be obtained.

The inspection system 1
A camera 30 is provided, and the movable drone 20 (moving body);
A controller 40 (control unit) for controlling the movement of the drone 20;
Is further provided.

With this configuration, the building B can be easily photographed.
That is, since the drone 20 can be arbitrarily moved to perform shooting from a desired position, the burden of shooting can be reduced as compared with the case where the operator performs shooting by himself. Further, since it is possible to perform shooting using a camera 30 that is generally provided in the drone 20, it is not necessary to add equipment to the drone 20, and it is possible to construct an inexpensive and efficient flight system. .

In addition, the moving body is
Drone 20 (unmanned aerial vehicle).

By configuring in this way, it is possible to more easily shoot the building B.
That is, since it can move arbitrarily in the vertical direction, it is possible to easily shoot even in the upper part of the building B. Further, since the vehicle does not travel on the ground, it is possible to take a picture regardless of the state of the ground.

Moreover, the irradiation apparatus 10 is
The surface of the building B can be provided with a first pattern (one pattern) and a second pattern (other pattern) different from the first pattern.

With this configuration, it is possible to easily acquire an image with a reduced pattern.
That is, the image with the pattern of the first pattern and the image with the pattern of the second pattern can complement each other with the image of the wall surface of the part with the pattern. An image can be obtained.

The inspection system 1
The image processing apparatus 50 (combination processing unit) that joins the plurality of images based on the patterns in the plurality of images photographed by the camera 30 is further provided.

With this configuration, it is possible to reduce the work load for joining the images.
That is, the work load can be reduced as compared with the case where the worker connects the images.

In addition, the inspection method (image acquisition method) according to this embodiment is
An irradiation process (first irradiation process S1 and second irradiation process S3) for applying a pattern of a predetermined pattern to the surface of the building B by irradiating the building B (object) with light;
A photographing step (first photographing step S2 and second photographing step S4) for photographing the surface of the building B on which the pattern of the predetermined pattern is attached in a plurality of places in the irradiation step;
It comprises.

  With this configuration, it is possible to acquire a plurality of images that are easy to connect.

The inspection method according to this embodiment is
Based on the patterns in the plurality of images photographed in the photographing step, a joining process step (first joining process step S5 and second joining process step S6) for joining the plurality of images is further provided. .

  By configuring in this way, it is possible to obtain an image connected with high accuracy.

The irradiation step includes
A first irradiation step S1 (first irradiation step) for applying a pattern of a first pattern (one pattern) on the surface of the building B;
A second irradiation step S3 (second irradiation step) for applying a second pattern (other pattern) different from the first pattern on the surface of the building B;
Including
The photographing process includes
A first photographing step S2 (first photographing step) for photographing the surface of the building B on which the pattern of the first pattern is attached in the first irradiation step S1 in a plurality of locations;
A second photographing step S4 (second photographing step) for photographing the surface of the building B with the second pattern in the second irradiation step S3 in a plurality of locations;
Including
The bonding process step includes
Based on the patterns in the plurality of images photographed in the first photographing step S2, the first combination processing step S5 (first combination image) for joining the plurality of images to obtain the image GM1 (first combination image). Process)
Based on the patterns in the plurality of images photographed in the second photographing step S4, a second combination processing step S6 (second combination image) for joining the plurality of images to obtain an image GM2 (second combined image). Process)
Including
Based on the image GM1 and the image GM2, a noise reduction processing step S7 for obtaining an image GM12 (one complementary image) obtained by reducing the first pattern and the second pattern is further provided.

By comprising in this way, the image which is easy to confirm the surface of the building B can be obtained.
That is, the pattern attached to the building B can be reduced after connecting a plurality of images, and the wall surface of the building B can be easily confirmed.

The inspection system 1 according to the present embodiment is an embodiment of the image acquisition system according to the present invention.
Moreover, the building B which concerns on this embodiment is one Embodiment of the target object which concerns on this invention.
Moreover, the irradiation apparatus 10 which concerns on this embodiment is one Embodiment of the irradiation part which concerns on this invention.
The camera 30 according to the present embodiment is an embodiment of the imaging unit according to the present invention.
Moreover, the drone 20 which concerns on this embodiment is one Embodiment of the mobile body which concerns on this invention.
The controller 40 according to the present embodiment is an embodiment of a control unit according to the present invention.
The image processing apparatus 50 according to the present embodiment is an embodiment of the combination processing unit according to the present invention.

  As mentioned above, although 1st embodiment of this invention was described, this invention is not limited to the said structure, A various change is possible within the range of the invention described in the claim.

  For example, in the present embodiment, the building B is illustrated as an object to be inspected by the inspection system 1, but the present invention is not limited to this, and the object can be arbitrarily selected. For example, not only artificial objects (such as buildings) but also natural objects can be used as objects.

  In the present embodiment, the case where the wall surface (vertical surface) of the building B is inspected is illustrated, but the present invention is not limited to this, and for example, a non-vertical surface such as a roof or a ceiling may be inspected. Is possible.

  Moreover, in this embodiment, although the example which applied this invention to the inspection system 1 for inspecting a target object was shown, the image acquisition system which concerns on this invention is not restricted to the object for inspection, An image is shown. It is possible to apply to various systems to acquire.

  Moreover, although the irradiation apparatus 10 which concerns on this embodiment shall irradiate the building B with a laser beam, this invention is not restricted to this, As long as the pattern characterized by the building B can be attached | subjected thereto Any light may be irradiated.

  Further, in the present embodiment, the plurality of light spots P by the laser light are exemplified as the pattern to be applied to the building B, but the present invention is not limited to this, and any pattern is attached to the building B. May be.

  Further, in the present embodiment, the color of the laser beam irradiated by the irradiation device 10 is not mentioned, but the color of the laser beam can be arbitrarily selected. In order to improve the photographing accuracy, it is desirable to select a color that is easily visible according to the ambient brightness and the color of the building B.

  Moreover, in this embodiment, the example which irradiates the building B with a laser beam and gives a pattern was shown, but the structure which attaches a pattern of light and a shadow by irradiating light to the building B through the slit of a predetermined shape, for example It is also possible.

  In the present embodiment, the drone 20 is exemplified as the moving body. However, the present invention is not limited to this, and any device that can move the camera 30 may be used. For example, it may be another unmanned aircraft (such as a helicopter that can be operated by radio) or a vehicle traveling on the ground.

  In the present embodiment, the camera 30 transmits the image data to the image processing device 50 every time the wall surface is photographed, but the present invention is not limited to this. For example, the camera 30 may be connected to the image processing device 50 by wire after photographing the entire wall surface, and all the photographed image data may be transmitted to the image processing device 50 together.

  In the present embodiment, the movement of the drone 20 is controlled by the controller 40 (the operation unit and the control unit) that can be operated by the worker. However, the present invention is not limited to this and is not dependent on the operation. It is also possible to adopt a configuration for controlling the movement of the drone 20 automatically (such as a control program). In this case, the controller 40 having the operation unit is unnecessary, and the drone 20 can be controlled only by the control unit that transmits a control signal to the drone 20.

  In the present embodiment, the first combination processing step S5, the second combination processing step S6, and the noise reduction processing step S7 are automatically performed by the image processing apparatus 50 (dedicated control program). It is also possible for the operator to carry out.

  Moreover, in this embodiment, after performing 1st irradiation process S1, 1st imaging | photography process S2, 2nd irradiation process S3, and 2nd imaging | photography process S4, 1st joint process process S5 and 2nd joint process process S6. However, the present invention is not limited to this, and the order of the steps can be changed within a possible range. For example, after performing 1st irradiation process S1 and 1st imaging | photography process S2 (before performing 2nd irradiation process S3 and 2nd imaging | photography process S4), performing 1st coupling | bonding process process S5, or 2nd irradiation process S3. It is also possible to perform the second photographing step S4 and the first combination processing step S5 at the same time. However, in order to fly the drone 20 in a short time in a concentrated manner, the first irradiation step S1, the first photographing step S2, the second irradiation step S3, and the second photographing step S4 are successively performed as in the present embodiment. It is desirable.

1 Inspection System 10 Irradiation Device 20 Drone 30 Camera 40 Controller 50 Image Processing Device

Claims (8)

By irradiating the object with light, an irradiation unit for attaching a predetermined pattern to the surface of the object;
An imaging unit that shoots the surface of the object with the pattern of the predetermined pattern divided into a plurality of locations;
An image acquisition system comprising: A movable body provided with the imaging unit and movable;
A control unit for controlling the movement of the moving body;
The image acquisition system according to claim 1, further comprising: The moving body is
An unmanned aerial vehicle,
The image acquisition system according to claim 2. The irradiation unit is
It is possible to attach a pattern of one pattern and another pattern different from the one pattern to the surface of the object.
The image acquisition system according to any one of claims 1 to 3. Based on the pattern in the plurality of images captured by the imaging unit, further comprising a combination processing unit for joining the plurality of images.
The image acquisition system according to any one of claims 1 to 4. By irradiating the object with light, an irradiation step of attaching a predetermined pattern to the surface of the object; and
A photographing step of photographing the surface of the object to which the pattern of the predetermined pattern is attached in the irradiation step by dividing it into a plurality of locations;
An image acquisition method comprising: Based on the pattern in the plurality of images photographed in the photographing step, further comprising a combining process step of joining the plurality of images.
The image acquisition method according to claim 6. The irradiation step includes
A first irradiation step of attaching a pattern of one pattern to the surface of the object;
A second irradiation step of attaching a pattern of another pattern different from the one pattern to the surface of the object;
Including
The photographing process includes
A first imaging step in which the surface of the object to which the pattern of the one pattern is attached in the first irradiation step is imaged in a plurality of locations;
A second photographing step of photographing the surface of the object to which the pattern of the other pattern is attached in the second irradiation step in a plurality of locations;
Including
The bonding process step includes
Based on the patterns in the plurality of images photographed in the first photographing step, a first combination processing step of joining the plurality of images to obtain a first combined image;
Based on the patterns in the plurality of images photographed in the second photographing step, a second combination processing step of joining the plurality of images to obtain a second combined image;
Including
Based on the first combined image and the second combined image, further comprising a noise reduction processing step of obtaining one complementary image obtained by reducing the pattern of the one pattern and the pattern of the other pattern,
The image acquisition method according to claim 7.

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