JP2022037586A - Control device, finder device, image pickup device, control method, and program - Google Patents

Abstract

To provide a control device, a finder device, an image pickup device, a control method, and a program that automatically adjust to the optimum diopter in response to a change in the display magnification of a finder device.SOLUTION: In an image pickup device, a control device is a computer that controls a finder device including a display device that displays an image captured by an image sensor, an eyepiece frame placed on the display surface side of the display device, an eyepiece placed between the display device and the eyepiece frame, and an adjustment mechanism (drive mechanism) that adjusts diopter by changing the position of the eyepiece. The control device controls the adjustment mechanism according to the diopter associated with the display magnification in response to changing the display magnification of the image displayed on the display device.SELECTED DRAWING: Figure 5

Description

The present invention relates to a control device, a finder device, an image pickup device, a control method, and a program.

Patent Document 1 describes that "automatic adjustment is performed so that the subject image always has the optimum display magnification depending on the position of the photographer's eyes". Patent Document 2 describes that "the diopter is automatically adjusted based on the user information".
[Prior Art Document]
[Patent Document]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2016-58983 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-245910

The optimum diopter may change depending on the display magnification of the finder device.

The control device according to one aspect of the present invention is a display device that displays an image captured by an image sensor, a frame arranged on the display surface side of the display device, and a lens arranged between the display device and the frame. It may be a control device for controlling a finder device including a system and an adjustment mechanism for adjusting diopter by changing the position of the lens system. The control device comprises a circuit configured to control the adjustment mechanism according to a diopter preliminarily associated with the display magnification in response to changing the display magnification of the image displayed on the display device. good.

The circuit accepts the display magnification of the display device, controls the display magnification of the display device according to the accepted display magnification, identifies the diopter preliminarily associated with the accepted display magnification, and identifies the specified vision. It may be configured to control the adjustment mechanism according to the degree.

The circuit receives setting information to be set from a plurality of setting information associated with the display magnification and diopter registered in the storage unit, and based on the received setting information, the display magnification and vision to be set. It may be configured to specify the degree, control the display magnification of the display device according to the specified display magnification, and control the adjustment mechanism according to the specified diopter.

The circuit may be configured to accept registration of new setting information in which the display magnification and diopter are associated with each other in the storage unit and to register the accepted new setting information in the storage unit.

The finder device according to one aspect of the present invention may include the control device, a display device, a lens system, and a frame.

The image pickup device according to one aspect of the present invention may include the above-mentioned finder device and an image sensor.

The control method according to one aspect of the present invention is a display device for displaying an image captured by an image sensor, a frame arranged on the display surface side of the display device, and a lens arranged between the display device and the frame. It may be a control method for controlling a finder device including a system and an adjustment mechanism for adjusting diopter by changing the position of the lens system. The control method may include a step of controlling the adjustment mechanism according to a diopter previously associated with the display magnification in response to changing the display magnification of the image displayed on the display device.

The program according to one aspect of the present invention may be a program for operating a computer as the control device.

According to one aspect of the present invention, it is possible to automatically adjust to the optimum diopter in response to the change in the display magnification of the finder device.

The outline of the above invention does not list all the necessary features of the present invention. A subcombination of these feature groups can also be an invention.

It is a figure which shows an example of the functional block of an image pickup apparatus. It is a perspective view of a finder device. It is a figure which shows an example of the image which the photographer visually recognizes from an eyepiece frame. It is a figure which shows an example of the image which the photographer visually recognizes from an eyepiece frame. It is a figure which shows an example of the image which the photographer visually recognizes from an eyepiece frame. It is a figure which shows an example of the image which the photographer visually recognizes from an eyepiece frame. It is a figure which shows an example of the setting information which shows corresponding to each display magnification for each user ID. It is a flowchart which shows an example of the procedure which automatically adjusts diopter according to a display magnification. It is a figure which shows an example of a hardware configuration.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention within the scope of the claims. Also, not all combinations of features described in the embodiments are essential to the means of solving the invention.

The claims, description, drawings, and abstracts include matters subject to copyright protection. The copyright holder will not object to any person's reproduction of these documents as long as they appear in the Patent Office files or records. However, in other cases, all copyrights are reserved.

Various embodiments of the present invention may be described with reference to flowcharts and block diagrams, wherein the block is (1) a stage of the process in which the operation is performed or (2) a device having a role of performing the operation. May represent a "part" of. Specific steps and "parts" may be implemented by programmable circuits and / or processors. Dedicated circuits may include digital and / or analog hardware circuits. It may include integrated circuits (ICs) and / or discrete circuits. The programmable circuit may include a reconfigurable hardware circuit. Reconfigurable hardware circuits include logical AND, logical OR, logical XOR, logical NAND, logical NOR, and other logical operations, flip flops, registers, field programmable gate arrays (FPGA), programmable logic arrays (PLA), etc. It may include a memory element such as.

The computer readable medium may include any tangible device capable of storing instructions executed by the appropriate device. As a result, the computer-readable medium having the instructions stored therein will include the product, including instructions that can be executed to create means for performing the operation specified in the flowchart or block diagram. Examples of computer-readable media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, and the like. More specific examples of computer readable media include floppy (registered trademark) disks, diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), Electrically erasable programmable read-only memory (EPROM®), static random access memory (SRAM), compact disk read-only memory (CD-ROM), digital versatile disc (DVD), Blu-ray (RTM) disc, Memory sticks, integrated circuit cards, etc. may be included.

Computer-readable instructions may include either source code or object code written in any combination of one or more programming languages. Source code or object code includes traditional procedural programming languages. Traditional procedural programming languages are assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcodes, firmware instructions, state setting data, or Smalltalk®, JAVA®, C ++. It may be an object-oriented programming language such as, and a "C" programming language or a similar programming language. Computer-readable instructions are used locally or on a local area network (LAN), wide area network (WAN), etc., to the processor or programmable circuit of a general purpose computer, special purpose computer, or other programmable data processing device. ) May be provided. The processor or programmable circuit may execute computer-readable instructions to create means for performing the operations specified in the flowchart or block diagram. Examples of processors include computer processors, processing units, microprocessors, digital signal processors, controllers, microcontrollers, and the like.

FIG. 1 shows an example of a functional block of the image pickup apparatus 100 according to the present embodiment. The image pickup device 100 includes an image pickup section 102, a lens section 200, and a finder device 400. The image pickup unit 102 includes an image sensor 120, an image pickup control unit 110, a memory 170, a display unit 180, and an operation unit 182.

The image sensor 120 may be configured by CCD or CMOS. The image sensor 120 outputs the image data of the optical image formed through the plurality of lenses 154 to the image pickup control unit 110. The image pickup control unit 110 may be configured by a microprocessor such as a CPU or MPU, a microcontroller such as an MCU, or the like.

The image pickup control unit 110 generates an image by performing demosaic processing on the image signal output from the image sensor 120 in response to an operation command of the image pickup device 100 from the operation unit 182. The image pickup control unit 110 stores the image in the memory 170. The image pickup control unit 110 outputs an image based on the image signal output from the image sensor 120 to the finder device 400.

The memory 170 may be a computer-readable recording medium and may include at least one of flash memories such as SRAM, DRAM, EEPROM, EEPROM, and USB memory. The memory 170 stores a program or the like necessary for the image pickup control unit 110 to control the image sensor 120 or the like. The memory 170 may be provided inside the housing of the image pickup apparatus 100.

The plurality of lenses 154 may function as a zoom lens, a varifocal lens, and a focus lens. At least some or all of the plurality of lenses 154 are movably arranged along the optical axis. The lens control unit 150 drives the lens drive unit 152 in accordance with a lens control command from the image pickup control unit 110 to move one or more lenses 154 along the optical axis direction. The lens control command is, for example, a zoom control command and a focus control command. The lens driving unit 152 may include a voice coil motor (VCM) that moves at least a part or all of the plurality of lenses 154 in the optical axis direction. The lens drive unit 152 may include an electric motor such as a DC motor, a coreless motor, or an ultrasonic motor. The lens driving unit 152 transmits power from the electric motor to at least a part or all of the plurality of lenses 154 via a mechanical member such as a cam ring and a guide shaft, and emits light at least a part or all of the plurality of lenses 154. It may be moved along the axis. In this embodiment, an example in which the plurality of lenses 154 are integrated with the image pickup apparatus 100 will be described. However, the plurality of lenses 154 may be interchangeable lenses and may be configured separately from the image pickup apparatus 100.

The display unit 180 may display an image based on the image signal output from the image sensor 120. The display unit 180 may display various setting information of the image pickup apparatus 100. The display unit 180 may be a liquid crystal display, a touch panel display, or the like. The display unit 180 may include a plurality of liquid crystal displays or touch panel displays.

The finder device 400 displays an image output from the image sensor 120. The finder device 400 includes a fixed cylinder 410, a moving cylinder 420, an eyepiece 422, a drive mechanism 430, a display device 440, a one-sided alignment mechanism 450, and an eyepiece frame 470.

The display device 440 displays an image from the image sensor 120. The display device 440 may include an organic EL element, that is, an OLED (Organic Light Emitting Diode). The display device 440 may be configured by arranging a plurality of organic EL elements. The display device 440 may be a liquid crystal display. The image displayed on the display device 440 is magnified via the eyepiece 422. The photographer confirms the image displayed on the display device 440 by looking into the eyepiece frame 470 through the eyepiece lens 422. The eyepiece frame 470 is an example of the frame.

The fixed cylinder 410 holds the moving cylinder 420 so as to be movable in the optical axis direction. The moving cylinder 420 holds the eyepiece 422. The drive mechanism 430 drives the moving cylinder 420 in the optical axis direction. By moving the eyepiece 422 in the optical axis direction, the diopter can be adjusted according to the visual acuity of the photographer looking into the eyepiece frame 470. The drive mechanism 430 is an example of an adjustment mechanism.

The one-sided alignment mechanism 450 urges the moving cylinder 420 toward the eyepiece frame 470 and aligns the moving cylinder 420 to one side in the optical axis direction. This prevents rattling when the moving cylinder 420 moves along the optical axis direction. Energization means applying force in one direction. Energization means applying force in one direction with great force. Energization means applying force and pressing in one direction.

FIG. 2 is a perspective view of the finder device 400. In FIG. 2, the fixed cylinder 410 is shown transparently in order to visualize the inside.

The finder device 400 includes a guide shaft portion 412 along the optical axis. The fixed cylinder 410 holds the moving cylinder 420 so as to be movable along the guide shaft portion 412.

The drive mechanism 430 includes an electric motor 432, a screw shaft portion 434, a gear portion 436, and a nut portion 438. The power from the electric motor 432 is transmitted to the screw shaft portion 434 via the gear portion 436. The electric motor 432 is supported by the fixed cylinder 410. The screw shaft portion 434 is arranged along the guide shaft portion 412, and receives power from the electric motor 432 via the gear portion 436 to rotate. The nut portion 438 is supported by the moving cylinder 420 and screwed into the screw shaft portion 434. Screwing means that screws mesh with each other like bolts and nuts. The screwing means that the screw groove provided on the inner peripheral surface of the nut portion 438 and the screw groove provided on the outer peripheral surface of the screw shaft portion 434 mesh with each other.

The moving cylinder 420 has a bearing portion 424 that bearings the guide shaft portion 412 on the side surface. The one-sided mechanism 450 has a spring 452 and a spring receiving portion 454. The spring 452 is arranged so as to surround a part around the bearing portion 424. The spring receiving portion 454 is provided so as to project around the bearing portion 424, and one end of the spring 452 comes into contact with the spring receiving portion 454. In the moving cylinder 420, the spring receiving portion 454 is pressed toward the eyepiece frame 470 by the spring 452 and is urged toward the eyepiece frame 470. Pressing means pressing by applying a force in one direction. Pressing means applying pressure in one direction.

When the screw shaft portion 434 rotates in the first rotation direction, the nut portion 438 moves to the second direction 402 opposite to the first direction 401 and the moving cylinder 420 moves to the second direction 402 via the screw shaft portion 434. , The spring 452 contracts when pressed by the spring receiving portion 454. When the screw shaft portion 434 rotates in the second rotation direction opposite to the first rotation direction, the screw shaft portion 434 moves in the first direction 401 via the screw shaft portion 434, and the moving cylinder 420 is moved by the spring 452 via the spring receiving portion 454. While being urged to the first direction 401, it moves to the first direction 401.

FIG. 3A shows an example of an image visually recognized by the photographer from the eyepiece frame 470. For example, the image shown in FIG. 3A is an image when the photographer visually recognizes the image with the naked eye. When the photographer wears spectacles and looks into the eyepiece frame 470, the eye point of the photographer who wears spectacles is different from the eye point of the photographer who does not wear spectacles. The distance between the eye point of the photographer wearing the spectacles and the eyepiece frame 470 is longer than the distance between the eye point of the photographer without the spectacles and the eyepiece frame 470. When the distance is long, the eyepiece frame 470 blocks a part of the light emitted from the eyepiece lens 422, and a phenomenon that the photographer's field of view is applied, so-called vignetting, occurs. For example, as shown in FIG. 3B, the photographer visually recognizes an image in which four corners are missing due to vignetting.

Therefore, the display magnification of the display device 440 is adjusted according to the distance from the photographer's eye point to the eyepiece frame 470. For example, when the photographer wears spectacles, the display magnification is reduced so that the four corners of the image visually recognized by the photographer are not chipped. However, the diopter when the photographer looks into the eyepiece frame 470 with the naked eye and the diopter when the photographer wears glasses and looks into the eyepiece frame 470 may be different. Therefore, as shown in FIG. 3C, the image visually recognized by the photographer wearing the spectacles may be blurred just by changing the display magnification. In such a case, the photographer needs to adjust the diopter by operating the diopter adjustment lever or the like after the display magnification is changed. As a result, as shown in FIG. 3D, the image visually recognized by the photographer can be prevented from being blurred.

However, if the diopter is also adjusted each time the display magnification is changed, the convenience of the photographer is reduced. Therefore, the finder device 400 according to the present embodiment automatically adjusts the diopter according to the change of the display magnification. This improves the convenience of the photographer.

The image pickup control unit 110 controls the drive mechanism 430 according to the diopter associated with the display magnification in accordance with changing the display magnification of the image displayed on the display device 440. The image pickup control unit 110 controls the drive mechanism 430 to move the eyepiece 422 to a position corresponding to the diopter associated with the display magnification.

The image pickup control unit 110 receives the display magnification of the display device 440. The image pickup control unit 110 may receive a desired display magnification from the photographer via the operation unit 182 or the display unit 180. The image pickup control unit 110 has a first display magnification mode in which the image is displayed on the display device 440 at the first display magnification, and a second display magnification mode in which the image is displayed on the display device 440 at a second display magnification smaller than the first display magnification. Either one of the modes may be accepted as the desired display magnification. The first display magnification mode may be a standard display magnification mode for the naked eye photographer. The second display magnification mode may be a mode with a display magnification reduced from the standard for the photographer who wears spectacles.

The image pickup control unit 110 controls the display magnification of the display device 440 according to the received display magnification. The image pickup control unit 110 specifies a diopter associated with the accepted display magnification in advance. The image pickup control unit 110 may specify the diopter corresponding to the display magnification based on the correspondence relationship between the display magnification and the diopter registered in the memory 170. The image pickup control unit 110 may specify the position of the eyepiece 422 as the diopter corresponding to the display magnification.

The memory 170 may store setting information in which the display magnification and the diopter are associated with each of the plurality of users. For example, as shown in FIG. 4, the memory 170 may store a table showing the diopter for each display magnification mode as setting information for each user ID.

The image pickup control unit 110 may accept setting information to be set from a plurality of setting information associated with the display magnification and the diopter registered in the memory 170. The image pickup control unit 110 may specify the display magnification and diopter to be set based on the received setting information. The image pickup control unit 110 may control the display magnification of the display device 440 according to the specified display magnification. The image pickup control unit 110 may control the drive mechanism 430 according to the specified diopter.

The image pickup control unit 110 may accept registration of new setting information in which the display magnification and the diopter are associated with the memory 170 via the operation unit 182 or the display unit 180. The image pickup control unit 110 may register the received new setting information in the memory 170.

The image pickup control unit 110 may accept the user ID of the photographer when the photographer starts using the image pickup device 100. When the photographer starts using the image pickup apparatus 100, the image pickup control unit 110 may accept the user ID of the photographer by selecting the user ID of the photographer from a plurality of user IDs. The image pickup control unit 110 may accept the display magnification mode from the photographer. The image pickup control unit 110 may receive a request for adjusting the diopter of the finder device 400 from the photographer via the operation unit 182 or the display unit 180. The image pickup control unit 110 may control the drive mechanism 430 to adjust the diopter according to the received request. Further, the image pickup control unit 110 may accept a request for registration of the diopter of the finder device 400 from the photographer via the operation unit 182 or the display unit 180. Upon receiving the request for diopter registration, the image pickup control unit 110 may register the accepted diopter as setting information in association with the current user ID and the current display magnification mode in the memory 170. ..

FIG. 5 is a flowchart showing an example of a procedure for automatically adjusting the diopter according to the display magnification.

The image pickup control unit 110 receives a request from the photographer to change the display magnification via the operation unit 182 or the display unit 180. The image pickup control unit 110 receives a request for changing the display magnification mode. The image pickup control unit 110 may accept a request for changing the user ID and the display magnification mode. The image pickup control unit 110 changes the display magnification of the display device 440 in response to a request for changing the display magnification (S100).

The image pickup control unit 110 specifies the diopter with the current user ID corresponding to the changed display magnification based on the setting information registered in the memory 170 (S102). The image pickup control unit 110 adjusts the position of the eyepiece 422 according to the specified diopter (S104). The image pickup control unit 110 controls the drive mechanism 430 to move the eyepiece 422 to a position corresponding to the specified diopter.

As described above, according to the finder device 400 according to the present embodiment, the diopter can be automatically adjusted according to the change of the display magnification. This makes it possible to improve the convenience of the photographer.

FIG. 6 shows an example of a computer 1200 in which a plurality of aspects of the present invention may be embodied in whole or in part. The program installed on the computer 1200 can cause the computer 1200 to function as an operation associated with the device according to an embodiment of the present invention or as one or more "parts" of the device. Alternatively, the program may cause the computer 1200 to perform the operation or the one or more "parts". The program may cause the computer 1200 to perform a process according to an embodiment of the present invention or a step of the process. Such a program may be run by the CPU 1212 to cause the computer 1200 to perform certain operations associated with some or all of the blocks of the flowcharts and block diagrams described herein.

The computer 1200 according to this embodiment includes a CPU 1212 and a RAM 1214, which are connected to each other by a host controller 1210. The computer 1200 also includes a communication interface 1222, an input / output unit, which are connected to the host controller 1210 via an input / output controller 1220. The computer 1200 also includes a ROM 1230. The CPU 1212 operates according to a program stored in the ROM 1230 and the RAM 1214, thereby controlling each unit.

The communication interface 1222 communicates with other electronic devices via the network. A hard disk drive may store programs and data used by the CPU 1212 in the computer 1200. The ROM 1230 stores in it a boot program or the like executed by the computer 1200 at the time of activation and / or a program depending on the hardware of the computer 1200. The program is provided via a computer-readable recording medium such as a CR-ROM, USB memory or IC card or network. The program is installed in RAM 1214, which is also an example of a computer-readable recording medium, or ROM 1230, and is executed by the CPU 1212. The information processing described in these programs is read by the computer 1200 and provides a link between the program and the various types of hardware resources described above. The device or method may be configured to implement the operation or processing of information according to the use of the computer 1200.

For example, when communication is executed between the computer 1200 and an external device, the CPU 1212 executes a communication program loaded in the RAM 1214, and performs communication processing with respect to the communication interface 1222 based on the processing described in the communication program. You may order. Under the control of the CPU 1212, the communication interface 1222 reads the transmission data stored in the transmission buffer area provided in the RAM 1214 or a recording medium such as a USB memory, and transmits the read transmission data to the network, or The received data received from the network is written to the reception buffer area or the like provided on the recording medium.

Further, the CPU 1212 makes the RAM 1214 read all or necessary parts of a file or a database stored in an external recording medium such as a USB memory, and executes various types of processing on the data on the RAM 1214. good. The CPU 1212 may then write back the processed data to an external recording medium.

Various types of information such as various types of programs, data, tables, and databases may be stored in recording media and processed. The CPU 1212 describes various types of operations, information processing, conditional judgment, conditional branching, unconditional branching, and information retrieval described in various parts of the present disclosure with respect to the data read from the RAM 1214. Various types of processing may be performed, including / replacement, etc., and the results are written back to the RAM 1214. Further, the CPU 1212 may search for information in a file, database, or the like in the recording medium. For example, when a plurality of entries each having an attribute value of the first attribute associated with the attribute value of the second attribute are stored in the recording medium, the CPU 1212 specifies the attribute value of the first attribute. Search for an entry that matches the condition from the plurality of entries, read the attribute value of the second attribute stored in the entry, and associate it with the first attribute that satisfies the predetermined condition. The attribute value of the second attribute obtained may be acquired.

The program or software module described above may be stored on a computer 1200 or in a computer readable storage medium near the computer 1200. Also, a recording medium such as a hard disk or RAM provided in a dedicated communication network or a server system connected to the Internet can be used as a computer readable storage medium, thereby allowing the program to be transferred to the computer 1200 over the network. offer.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

The order of execution of each process such as operation, procedure, step, and step in the apparatus, system, program, and method shown in the claims, specification, and drawings is particularly "before" and "prior to". It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Even if the scope of claims, the specification, and the operation flow in the drawings are explained using "first", "next", etc. for convenience, it means that it is essential to carry out in this order. It's not a thing.

100 Imaging device 102 Imaging unit 110 Imaging control unit 120 Image sensor 150 Lens control unit 152 Lens drive unit 154 Lens 170 Memory 180 Display unit 182 Operation unit 200 Lens unit 400 Finder device 410 Fixed cylinder 412 Guide shaft unit 420 Moving cylinder 422 Eyepiece 424 Bearing part 430 Drive mechanism 432 Electric motor 434 Screw shaft part 436 Gear part 438 Nut part 440 Display device 450 One-sided mechanism 452 Spring 454 Spring receiving part 470 Eyepiece frame 1200 Computer 1210 Host controller 1212 CPU
1214 RAM
1220 Input / Output Controller 1222 Communication Interface 1230 ROM

Claims (8)

A display device that displays an image captured by an image sensor, a frame arranged on the display surface side of the display device, a lens system arranged between the display device and the frame, and positions of the lens system. It is a control device that controls a finder device equipped with an adjustment mechanism that adjusts the diopter by changing the lens.
A control device including a circuit configured to control the adjustment mechanism according to a diopter previously associated with the display magnification in response to changing the display magnification of an image displayed on the display device. .. The circuit is
Accepting the display magnification of the display device,
The display magnification of the display device is controlled according to the received display magnification, and the display magnification is controlled.
The diopter associated with the received display magnification is specified, and the diopter is specified.
The control device according to claim 1, wherein the adjustment mechanism is controlled according to the specified diopter. The circuit is
Accepts the setting information to be set from multiple setting information that associates the display magnification and diopter registered in the storage unit.
Based on the received setting information, specify the display magnification and diopter to be set, and
The display magnification of the display device is controlled according to the specified display magnification, and the display magnification is controlled.
The control device according to claim 1, wherein the adjustment mechanism is controlled according to the specified diopter. The circuit is
Accepting the registration of new setting information corresponding to the display magnification and diopter in the storage unit,
The control device according to claim 3, wherein the received new setting information is registered in the storage unit. The control device according to any one of claims 1 to 4,
With the display device
With the lens system
A finder device including the frame. The finder device according to claim 5 and
An image pickup device including the image sensor. A display device that displays an image captured by an image sensor, a frame arranged on the display surface side of the display device, a lens system arranged between the display device and the frame, and positions of the lens system. It is a control method for controlling a finder device equipped with an adjustment mechanism for adjusting diopter by changing the lens.
A control method comprising a step of controlling the adjustment mechanism according to a diopter previously associated with the display magnification in response to changing the display magnification of an image displayed on the display device. A program for operating a computer as a control device according to any one of claims 1 to 4.

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