JP2023174259A - Control unit, lens device, imaging apparatus, control method, and program - Google Patents

Abstract

To provide a control unit that can prevent a deterioration in image quality during tilt driving.SOLUTION: A control unit (110) has: acquisition means (105) that acquires a tilt amount for tilting an optical axis of an optical system (101) with respect to an imaging surface, or a shift amount for moving the optical axis of the optical system in a direction orthogonal to the optical axis; and determination means (104) that, based on the tilt amount or the shift amount, determines the amount of change in the angle of view in the optical system or the amount of change in a focus frame displayed on a display unit (206).SELECTED DRAWING: Figure 1

Description

The present invention relates to a control device, a lens device, an imaging device, a control method, and a program.

2. Description of the Related Art Conventionally, imaging optical systems are known that have a tilt mechanism that tilts a focal plane and a shift mechanism that shifts a focal plane by driving a lens group according to Scheimpflug's law. On the other hand, in an imaging optical system having a tilt mechanism, an angle of view shift (composition shift) in which the angle of view (composition) shifts occurs during tilt driving, which impairs user convenience. Patent Document 1 discloses a processing device that drives a shift lens group during tilt drive to cancel out the angle of view shift.

JP 2019-91027 Publication

In the processing device disclosed in Patent Document 1, an area outside the image circle is used by driving the shift lens group during tilt driving, resulting in deterioration of image quality.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a control device that can suppress deterioration of image quality during tilt drive.

A control device according to one aspect of the present invention provides a tilt amount for tilting an optical axis of an optical system with respect to an imaging surface, or a shift for moving the optical axis of the optical system in a direction perpendicular to the optical axis. an acquisition means for acquiring the amount; and a determination means for determining the amount of change in the angle of view in the optical system or the amount of change in the focusing frame displayed on the display unit based on the amount of tilt or the amount of shift. .

Other objects and features of the invention are illustrated in the following examples.

According to the present invention, it is possible to provide a control device that can suppress deterioration of image quality during tilt drive.

It is a block diagram of an imaging device in each example. FIG. 3 is an explanatory diagram of the Scheimpflug principle and composition shift in each example. FIG. 3 is an explanatory diagram of movement of a focusing frame due to a composition shift in Example 1. FIG. 12 is a flowchart illustrating processing for moving the focusing frame when the TS amount is specified using the lens operation unit in each embodiment. 12 is a flowchart illustrating processing for moving the focusing frame when the TS amount is specified using the camera operation unit in each embodiment. 12 is a flowchart illustrating processing for moving the focusing frame when the amount of change in the focusing frame is calculated by the camera body in each embodiment. FIG. 7 is an explanatory diagram of movement and deformation of a focusing frame due to a composition shift in Example 2;

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, with reference to FIG. 1, the configuration of the imaging device 10 in each embodiment will be described. FIG. 1 is a block diagram of an imaging device 10. The imaging device 10 includes a camera body 200 and an interchangeable lens (lens device) 100 that is detachable from the camera body 200. However, each embodiment is not limited to this, and can also be applied to an imaging device in which a camera body and a lens device are integrally configured.

The interchangeable lens 100 is mechanically and electrically connected to the camera body 200 via a mount (not shown). The interchangeable lens 100 receives power from the camera body 200 via an electrical terminal (not shown) provided on the mount. The interchangeable lens 100 uses the power received from the camera body 200 to control various actuators and a lens microcomputer (control device) 110, which will be described later. The camera body 200 communicates with the interchangeable lens 100 via a camera communication means 202 provided on the mount, and controls the interchangeable lens 100 by transmitting control commands to the interchangeable lens 100.

The camera body 200 includes an image sensor 201 having a phase difference AF sensor function, a camera communication means 202, a TS acquisition section 203, a signal processing section 204, a camera calculation means 205, a display section 206, a camera operation section 207, and a camera control means 208. , and a camera microcomputer 209. The image sensor 201 is a photoelectric conversion element such as a CMOS sensor or a CCD sensor, and photoelectrically converts a subject image (optical image) formed by the imaging optical system in the interchangeable lens 100 to output an electric signal (analog signal). . The analog signal output from the image sensor 201 is converted into a digital signal by an A/D conversion circuit (not shown). The TS acquisition unit (acquisition means) 203 determines the amount of tilt for tilting the optical axis (principal surface of the optical system 101) of the optical system 101 with respect to the imaging plane, and the direction perpendicular to the optical axis of the optical system 101. Obtain the shift amount (TS amount) for moving to. Note that in each embodiment, the TS acquisition unit 203 may acquire at least one of the tilt amount and the shift amount. This point also applies to input means 105, which will be described later.

The signal processing unit 204 performs various image processing on the digital signal from the A/D conversion circuit to generate a video signal. Further, the signal processing unit 204 generates, from the video signal, a contrast state of the subject image, that is, focus information indicating the focus state of the imaging optical system and brightness information indicating the exposure state. Further, the signal processing unit 204 outputs the video signal to the display unit 206, and the display unit 206 displays the video signal as a live view image used for checking the composition, focus state, and the like. Further, the signal processing section 204 outputs the video signal to a recording processing section (not shown). The recording processing unit stores the video signal in an external memory or the like as still image or moving image data.

A camera microcomputer 209 serving as a camera control unit (control device) controls the camera body 200 in response to inputs from an imaging instruction switch and various setting switches included in a camera operation unit (operation unit) 207 . Camera communication means 202 transmits a control command according to an input from camera operation section 207 to lens microcomputer 110 via a communication terminal section.

The interchangeable lens 100 includes an optical system (imaging optical system) 101, a moving means 102 for moving the lens group of the optical system 101, and a detecting means 103 for detecting lens information. The interchangeable lens 100 also includes a lens operation section (operation section) 108 for instructing the TS amount, a storage means 109 for storing optical information of the interchangeable lens 100, and a lens microcomputer 110. The optical system 101 includes at least two shift lens sections including a first shift lens section 101a and a second shift lens section 101b. The lens microcomputer 110 includes a lens calculation unit 104 that calculates the composition change amount or the focusing frame movement amount from the lens information described above, an input unit 105 that inputs the TS amount, and an optical system 101 that operates according to the input TS amount. It has a lens control means 106 for controlling. Here, the amount of structural change corresponds to the amount of change in the angle of view in the optical system 101, and the amount of focus frame movement corresponds to the amount of change in the focus frame displayed on the display unit 206.

The storage unit 109 stores data (functions or coefficients) indicating the relationship between the tilt amount or shift amount and the composition change amount or focus frame movement amount. However, each embodiment is not limited to this, and such data may be stored in a storage means (not shown) of the camera body 200. The lens calculation means 104 or the camera calculation means 205 is a determination means that calculates (determines) the composition change amount or the focusing frame movement amount using the tilt amount or shift amount and the data stored in the storage means.

The interchangeable lens 100 has a lens communication means 107 for communicating with the camera body 200. Although not shown in FIG. 1, the interchangeable lens 100 includes a focus lens for adjusting the focus, a zoom lens for changing the focal length, an aperture unit for adjusting the amount of light, and an image blur correction for image blur correction. It has a correction lens, a gyro sensor for attitude detection, etc.

The interchangeable lens 100 provides the TS amount to the input means 105 according to the amount of operation of the lens operation section 108 . The input means 105 is an acquisition means for acquiring the TS amount, and transmits the acquired TS amount to the lens control means 106. The lens control means 106 calculates a control amount for realizing a desired TS amount, and moves the first shift lens section 101a and the second shift lens section 101b to a component in a direction perpendicular to the optical axis direction via a moving means. move independently from each other in directions that include By driving at least two shift lens sections in this manner, tilt drive and shift drive (TS drive) can be realized by causing image plane tilt due to eccentricity of the lens.

Here, the Scheimpflug principle and the accompanying composition shift (field angle shift) will be explained with reference to FIGS. 2(a) to 2(c). FIGS. 2A to 2C are explanatory diagrams of the Scheimpflug principle and composition shift (composition change). When the main surface of the optical system 101 or the image sensor 201 in the interchangeable lens 100 is tilted, the in-focus range on the subject side is determined according to Scheimpflug's principle.

FIG. 2A shows the in-focus range when the main surface of the optical system 101 is not tilted with respect to the imaging surface. FIG. 2B shows the in-focus range when the principal surface of the optical system 101 is tilted with respect to the imaging surface with the principal point of the optical system 101 as the rotation center (rotation axis). FIG. 2C shows a composition shift with respect to FIG. 2A when the main surface of the optical system 101 is tilted with respect to the imaging surface with the imaging surface side as the center of rotation relative to the principal point of the optical system 101. In FIGS. 2A to 2C, 300a, 300b, and 300c are imaging surfaces, and 301a, 301b, and 301c are principal surfaces of the optical system 101, respectively. 302a and 302b are respectively in-focus subject planes, and 302c is the subject plane after composition shift (not the in-focus plane). 303c is the rotation center of the optical system 101, and 304c is the composition shift amount.

The Scheimpflug principle is that when the imaging surface 300b and the main surface of the optical system 301b intersect at a certain linear intersection, the object surface 302b also passes through the same intersection, as shown in FIG. 2(b). be. When the center of rotation is located in front or behind the principal point of the optical system 101, a composition shift occurs due to a change in the optical axis. In this case as well, Scheimpflug's principle holds true.

When the subject you want to photograph has depth, you can focus from the front to the back of the subject by tilting the subject to match that depth. When you want to focus on a depth area with a lens that does not have a tilt mechanism, the common method is to close down the aperture to increase the depth of field, but with a tilt lens, even if the aperture is wide open, you can tilt it to achieve that depth. It is possible to adjust the focus according to the depth. Conversely, by tilting the main surface of the optical system 101 in a direction opposite to the inclination of a deep object, it is also possible to make the object plane intersect the depth direction of the object at an angle close to a right angle. In this case, since the range of focus can be extremely narrowed, a diorama-like image can be obtained.

Note that each embodiment is not limited to the configuration described above. In each of the embodiments, TS drive is realized by eccentricity of the lens, but a configuration having a tilting mechanism that moves the lens barrel itself of the interchangeable lens 100 to perform TS drive may also be used. Each example will be specifically described below.

First, Example 1 of the present invention will be described. In this embodiment, when a composition shift (field angle shift) occurs due to TS driving, the focusing frame displayed on the display unit 206 is moved in accordance with the composition shift.

Focusing frame movement in this embodiment will be described with reference to FIGS. 1, 3(a), 3(b) to 6. FIGS. 3(a) and 3(b) are explanatory diagrams of movement of the focusing frame due to composition shift, and show examples of composition shift and movement of the focusing frame in the configuration shown in FIG. 2(c). . FIG. 3A shows a subject 400a and a focusing frame 401a displayed on the display unit 206 when the optical axis of the optical system 101 is not tilted with respect to the imaging surface. The subject 400a is located at an arbitrary distance and is parallel to the imaging plane. FIG. 3(b) shows the case where the main surface of the optical system 101 is tilted with respect to the imaging surface as shown in FIG. A subject 400b displayed on the display unit 206, a focusing frame 401b before movement, and a focusing frame 402b after movement are shown. Originally, there is a portion of the subject 400b that is out of focus due to the tilt effect, but this is not shown for simplicity.

Next, with reference to FIG. 4, processing for moving the focusing frame will be described. FIG. 4 is a flowchart showing the processing for moving the focusing frame, and shows the processing for moving the focusing frame when the tilt amount and shift amount (TS amount) are specified using the lens operation unit 108.

First, when the user operates the lens operating section 108 of the interchangeable lens 100 in step S100, the TS amount is inputted to the lens control means 106 by the input means 105 in step S101. Here, the lens operation unit 108 may be any operation member that allows the user to input a desired TS amount value or select the TS amount from multiple levels (large, medium, small, etc.). Examples of the lens operation unit 108 include, but are not limited to, an electronic monitor, a rotary dial, or an ON/OFF switch.

Note that the TS amount may be determined by the user operating the camera operation section 207 of the camera body 200, as shown in FIG. FIG. 5 shows processing for moving the focusing frame when the TS amount is specified using the camera operation unit 207. At this time, when the camera operation section 207 is first operated by the user in step S204, the camera control means 208 converts the operation of the camera operation section 207 into a TS amount in step S205. Then, in step S206, the camera control means 208 transmits the TS amount to the lens control means 106 via the camera communication means 202 and the lens communication means 107.

Subsequently, in step S102, the detection means 103 detects lens information such as position information of each lens constituting the optical system 101. Subsequently, in step S103, the lens control means 106 calculates the control amount of the moving means 102 for driving the first shift lens section 101a and the second shift lens section 101b so as to realize the input TS amount. . Then, the lens control means 106 transmits the calculated control amount to the moving means 102 in order to control the moving means 102. The control amount is calculated using the lens information detected in step S102, the optical information of the interchangeable lens 100 stored in the storage unit 109, and the like. Subsequently, in step S104, the moving means 102 drives the lens group (first shift lens section 101a and second shift lens section 101b) of the optical system 101 based on the control amount.

Subsequently, in step S105, the lens calculation means (calculation means) 104 uses the lens information detected in step S102, the optical information stored in the storage means 109, etc. to calculate the composition change amount or the focus frame change. Calculate the amount. Here, the lens information or optical information includes, but is not limited to, the zoom position (focal length), the focus position (subject distance), the TS amount, the position of the rotation axis of the optical system 101, and the like. Note that the lens calculation unit 104 may use the size of the image sensor 201 when calculating the composition change amount or the focusing frame change amount. Subsequently, in step S106, the lens calculation means 104 transmits the calculated composition change amount or focusing frame change amount to the camera body 200 via the lens communication means 107.

Subsequently, in step S<b>200 , the camera body 200 receives the composition change amount or the focusing frame change amount through the camera communication means 202 and outputs it to the camera calculation means (calculation means) 205 . Subsequently, in step S201, the camera calculation unit 205 determines whether the composition change amount has been received (whether or not the received information is the composition change amount). If the composition change amount is received, the process advances to step S202. In step S02, the camera calculation means 205 calculates the amount of change in the focusing frame based on the amount of change in the composition. Subsequently, in step S203, the display unit 206 changes the position of the displayed focusing frame based on the amount of change in the focusing frame calculated by the camera calculation unit 205.

On the other hand, if the composition change amount is not received in step S201 (if the received information is the focus frame change amount), the process advances to step S203. In step S203, the display unit 206 changes the position of the displayed focusing frame based on the amount of change in the focusing frame received from the interchangeable lens 100.

In this embodiment, as shown in FIG. 6, when the TS amount is acquired by operating the camera operation unit 207 of the camera body 200, or when the TS amount is acquired by the TS acquisition unit 203, the acquired TS amount may be sent to the camera calculation means 205. FIG. 6 is a flowchart illustrating processing for moving the focusing frame when the amount of change in the focusing frame is calculated by the camera body 200. At this time, first in step S207, the TS amount is acquired by the user operating the camera operation unit 207 or by using the TS acquisition unit 203. Subsequently, in step S208, the camera calculation means 205 calculates the focusing frame change amount based on the TS amount. Then, in step S203, the display unit 206 changes the position of the displayed focusing frame based on the amount of change in the focusing frame calculated by the camera calculation unit 205.

As described above, when a composition shift occurs due to TS driving, the focusing frame displayed on the display unit 206 is moved in accordance with the composition shift. That is, in this embodiment, the focusing frame follows the composition shift. This allows the user to easily focus on the intended subject, improves the user's operability, and suppresses deterioration in image quality.

Next, a second embodiment of the present invention will be described with reference to FIGS. 7(a) and 7(b). In this embodiment, when a composition shift (field angle shift) or a change in the subject plane that is in focus occurs due to TS driving, the focusing frame displayed on the display unit 206 is adjusted to match the composition shift or change in the subject plane. Move and transform. Note that in this example, the movement of the focusing frame and the sequence are the same as in Example 1, so their explanation will be omitted.

FIGS. 7(a) and 7(b) are explanatory diagrams of the movement and deformation of the focusing frame accompanying the composition shift in this example, and the composition shift that occurs in the configuration shown in FIG. 2(c) and the An example of movement of the focusing frame in the example is shown. FIG. 7A shows a subject 500a and a focusing frame 501a displayed on the display unit 206 when the optical axis of the optical system 101 is not tilted with respect to the imaging surface. FIG. 7B shows the display unit 206 when the main surface of the optical system 101 is tilted with respect to the imaging surface as shown in FIG. shows a subject 500b displayed, a focusing frame 501b before movement, and a focusing frame 502b after movement and transformation. Originally, there are parts of the subject 500b that are out of focus due to the tilt effect, but these are not shown for simplicity.

Next, the focusing frame deformation process in this embodiment will be explained. Note that the processing from the TS amount to the calculation of the composition change amount by the camera calculation means 205 is the same as in the first embodiment, and therefore the description thereof will be omitted. The calculated composition change amount is transmitted to the camera body 200 via the lens communication means 107. The camera body 200 receives the composition change amount through the camera communication means 202 and outputs the composition change amount to the camera calculation means 205 . The camera calculation unit 205 calculates (determines) the amount of deformation (amount of change) of the size or shape of the focusing frame based on the amount of composition change. The display unit 206 changes the size or shape of the displayed focusing frame (deforms the focusing frame) based on the amount of deformation of the focusing frame calculated by the camera calculation means 205.

Further, when the TS amount is acquired by operating the camera operation section 207 of the camera body 200, or when the TS amount is acquired by the TS acquisition section 203, the acquired TS amount is sent to the camera calculation means 205, and the camera calculation means 205 calculates the amount of deformation of the focusing frame. The display unit 206 changes the size or shape of the displayed focus frame (deforms the focus frame) based on the amount of deformation calculated by the camera calculation means 205.

As described above, when a composition shift and a change in the focused subject surface occur due to TS driving, the focusing frame displayed on the display unit 206 is moved and deformed. That is, in this embodiment, the focusing frame follows and deforms in accordance with the composition shift. This allows the user to easily focus on the intended subject, as well as understand changes in the surface of the subject that is in focus, improving user operability and suppressing deterioration in image quality. It is.

(Other examples)
The present invention provides a system or device with a program that implements one or more of the functions of the above-described embodiments via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. This can also be achieved by processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

According to each embodiment, since deterioration in image quality can be suppressed during tilt driving, a control device that can smoothly shift to a focusing operation while suppressing deterioration in image quality even when a field angle shift occurs; A lens device, an imaging device, a control method, and a program can be provided.

The disclosure of each embodiment includes the following configurations and methods.
(Configuration 1)
acquisition means for acquiring a tilt amount for tilting an optical axis of an optical system with respect to an imaging surface or a shift amount for moving the optical axis of the optical system in a direction perpendicular to the optical axis;
A control device comprising: determining means for determining the amount of change in the angle of view in the optical system or the amount of change in the focusing frame displayed on the display unit based on the amount of tilt or the amount of shift. .
(Configuration 2)
further comprising a storage means for storing data indicating a relationship between the tilt amount or the shift amount and the change amount of the angle of view or the change amount of the focusing frame;
The control device according to configuration 1, wherein the determining means determines the amount of change in the angle of view or the amount of change in the focusing frame using the tilt amount or the shift amount and the data. .
(Configuration 3)
The determining means further determines the amount of change in the angle of view or the focusing frame based on a zoom position, a focus position, or a position of a rotation axis when tilting the optical axis of the optical system with respect to the imaging surface. 3. The control device according to configuration 1 or 2, wherein the control device determines the amount of change in .
(Configuration 4)
Structures 1 to 3, further comprising a display control means for moving the position of the focusing frame displayed on the display unit based on the amount of change in the angle of view or the amount of change in the focusing frame. The control device according to any one of the above.
(Configuration 5)
Configuration 4, wherein the display control means changes the size or shape of the focusing frame displayed on the display unit based on the amount of change in the angle of view or the amount of change in the focusing frame. The control device described in .
(Configuration 6)
optical system and
A lens device comprising the control device according to any one of Structures 1 to 5.
(Configuration 7)
7. The lens device according to configuration 6, further comprising an operation section for a user to set the tilt amount or the shift amount.
(Configuration 8)
The lens device is removable from the imaging device,
8. The lens device according to configuration 6 or 7, wherein the amount of change in the angle of view or the amount of change in the focusing frame is transmitted from the lens device to the imaging device.
(Configuration 9)
An image sensor and
a display section that displays a focusing frame;
An imaging device comprising the control device according to any one of Configurations 1 to 5.
(Configuration 10)
The imaging device according to configuration 9, further comprising an operation section for a user to set the tilt amount or the shift amount.
(Configuration 11)
According to configuration 9 or 10, further comprising a display control means for moving the position of the focusing frame displayed on the display unit based on the amount of change in the angle of view or the amount of change in the focusing frame. The imaging device described.
(Method 1)
obtaining a tilt amount for tilting the optical axis of the optical system with respect to an imaging surface or a shift amount for moving the optical axis of the optical system in a direction perpendicular to the optical axis;
A control method comprising the step of determining, based on the tilt amount or the shift amount, an amount of change in the angle of view in the optical system or an amount of change in a focusing frame displayed on a display means.
(Configuration 12)
A program that causes a computer to execute the control method described in Method 1.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the invention.

104 Lens calculation means (determination means)
105 Input means (obtaining means)
110 Lens microcomputer (control device)
203 TS acquisition unit (acquisition means)
205 Camera calculation means (determination means)
206 Display unit 209 Camera microcomputer (control device)

Claims (13)

acquisition means for acquiring a tilt amount for tilting an optical axis of an optical system with respect to an imaging surface or a shift amount for moving the optical axis of the optical system in a direction perpendicular to the optical axis;
A control device comprising: determining means for determining the amount of change in the angle of view in the optical system or the amount of change in the focusing frame displayed on the display unit based on the amount of tilt or the amount of shift. . further comprising a storage means for storing data indicating a relationship between the tilt amount or the shift amount and the change amount of the angle of view or the change amount of the focusing frame;
The control according to claim 1, wherein the determining means determines the amount of change in the angle of view or the amount of change in the focusing frame using the tilt amount or the shift amount and the data. Device. The determining means further determines the amount of change in the angle of view or the focusing frame based on a zoom position, a focus position, or a position of a rotation axis when tilting the optical axis of the optical system with respect to the imaging surface. 2. The control device according to claim 1, wherein the control device determines an amount of change in . 2. The camera according to claim 1, further comprising display control means for moving the position of the focusing frame displayed on the display unit based on the amount of change in the angle of view or the amount of change in the focusing frame. control device. 2. The display control means changes the size or shape of the focusing frame displayed on the display unit based on the amount of change in the angle of view or the amount of change in the focusing frame. 4. The control device according to 4. optical system and
A lens device comprising: the control device according to any one of claims 1 to 5. 7. The lens device according to claim 6, further comprising an operation section for a user to set the tilt amount or the shift amount. The lens device is removable from the imaging device,
7. The lens device according to claim 6, wherein the amount of change in the angle of view or the amount of change in the focusing frame is transmitted from the lens device to the imaging device. An image sensor and
a display section that displays a focusing frame;
An imaging device comprising: the control device according to claim 1 . The imaging device according to claim 9, further comprising an operation section for a user to set the tilt amount or the shift amount. 10. The apparatus according to claim 9, further comprising display control means for moving the position of the focusing frame displayed on the display unit based on the amount of change in the angle of view or the amount of change in the focusing frame. imaging device. obtaining a tilt amount for tilting the optical axis of the optical system with respect to the imaging surface or a shift amount for moving the optical axis of the optical system in a direction perpendicular to the optical axis;
A control method comprising the step of determining, based on the tilt amount or the shift amount, an amount of change in the angle of view in the optical system or an amount of change in a focusing frame displayed on a display means. A program that causes a computer to execute the control method according to claim 12.