WO2024058029A1

WO2024058029A1 - Imaging device, information processing device, and program

Info

Publication number: WO2024058029A1
Application number: PCT/JP2023/032551
Authority: WO
Inventors: 真己斗大田; 英紀上林
Original assignee: ソニーグループ株式会社
Priority date: 2022-09-15
Filing date: 2023-09-06
Publication date: 2024-03-21

Abstract

An imaging device according to the present disclosure comprises a camera body that is equipped with a first blur correction function, and an interchangeable lens that is equipped with a second blur correction function. The imaging device also comprises a control unit. The control unit acquires lens performance information relating to the performance of the second blur correction function of the interchangeable lens. The control unit acquires camera performance information relating to the performance of the first blur correction function of the camera body. On the basis of the lens performance information and the camera performance information, the control unit determines whether to perform blur correction using either one of the interchangeable lens or the camera body or to cooperatively activate blur correction of the interchangeable lens and the camera body.

Description

Imaging device, information processing device and program

The present disclosure relates to an imaging device, an information processing device, and a program.

A camera system is known in which a camera body and an exchangeable lens communicate with each other. In such a camera system, control data regarding photography, such as focal length and exposure time, is exchanged between the lens side and the camera body side.

Also, a camera system is known in which a shake correction device is mounted on each of the camera body and lens. In such a camera system, there is a known technique for effectively operating a shake correction device in the camera system as a whole when shake can be corrected in each of the camera body and lens.

Japanese Patent Application Publication No. 11-101998

The image stabilization devices installed on the camera body and lens work together to achieve image stabilization for the camera system as a whole, making it possible to compensate for greater shake than when image stabilization is performed on the camera body and lens individually. become.

However, if there is a difference between the correction performance on the camera body side and the correction performance on the lens side, the correction performance when both the camera body and lens cooperate to perform image stabilization is different from that of the one with higher correction performance alone. It may be lower than if you had done so.

When implementing shake correction using shake correction devices mounted on the camera body and lens, it is desirable to further improve the performance of shake correction.

Therefore, the present disclosure provides a mechanism that can further improve the performance of blur correction.

Note that the above-mentioned problem or object is only one of the plurality of problems or objects that can be solved or achieved by the plurality of embodiments disclosed in this specification.

The imaging device of the present disclosure includes a camera body equipped with a first shake correction function and an interchangeable lens equipped with a second shake correction function. The imaging device includes a control section. The control unit acquires lens performance information regarding the performance of the second blur correction function of the interchangeable lens. The control unit acquires camera performance information regarding the performance of the first blur correction function of the camera body. The control unit performs blur correction on one of the interchangeable lens and the camera body, or causes the blur correction on the interchangeable lens and the camera body to operate cooperatively, based on the lens performance information and the camera performance information. or decide.

1 is a front external view of a camera system according to an embodiment of the present disclosure. FIG. 1 is a rear external view of a camera system according to an embodiment of the present disclosure. FIG. 1 is a block diagram showing an example of a functional configuration of a camera system according to an embodiment of the present disclosure. FIG. 3 is a diagram showing a schematic configuration of a body-side shake correction mechanism. FIG. 2 is a block diagram illustrating a configuration example of a body-side blur correction control section according to an embodiment of the present disclosure. 2 is a flowchart illustrating an example of the flow of determination processing according to an embodiment of the present disclosure. FIG. 7 is a block diagram illustrating a configuration example of a body-side blur correction control section according to a modification of the embodiment of the present disclosure. FIG. 7 is a diagram for explaining the relationship between shutter speed and focal length and correction performance according to a modification of the embodiment of the present disclosure. 12 is a flowchart illustrating an example of the flow of determination processing according to a modification of the embodiment of the present disclosure.

The following describes in detail the embodiments of the present disclosure with reference to the accompanying drawings. Note that in this specification and drawings, components that have substantially the same functional configuration are designated by the same reference numerals to avoid redundant description.

Furthermore, in this specification and the drawings, a plurality of components having substantially the same or similar functional configurations may be distinguished by using different numbers after the same reference numeral. However, if there is no particular need to distinguish between a plurality of components having substantially the same or similar functional configurations, only the same reference numerals are given. Further, similar components in different embodiments may be distinguished by attaching different alphabets or numbers after the same reference numeral. However, if there is no particular need to distinguish between similar components, only the same reference numerals are given.

One or more embodiments (including examples and modifications) described below can each be implemented independently. On the other hand, at least a portion of the plurality of embodiments described below may be implemented in combination with at least a portion of other embodiments as appropriate. These multiple embodiments may include novel features that are different from each other. Therefore, these multiple embodiments may contribute to solving mutually different objectives or problems, and may produce mutually different effects.

<<1. Example of general configuration of camera system >>
An overview of a camera system 1 according to an embodiment of the present disclosure will be described using FIGS. 1 and 2. FIG. 1 is a front external view of a camera system 1 according to an embodiment of the present disclosure. FIG. 2 is a rear external view of the camera system 1 according to the embodiment of the present disclosure.

Note that, hereinafter, XYZ coordinates may be shown in the figures. The Z-axis positive direction corresponds to the photographing direction (optical axis direction) of the camera system 1. The plane formed by the X-axis direction and the Y-axis direction corresponds to the imaging plane of the camera system 1.

The camera system 1 shown in FIGS. 1 and 2 is a single-lens reflex type digital camera with interchangeable lenses (an example of an imaging device).

As shown in FIG. 1, the camera system 1 includes a camera main body (camera body) 2 and an interchangeable photographic lens unit (interchangeable lens) 3.

The interchangeable lens 3 is detachably attached to the camera body 2. The interchangeable lens 3 mainly includes a lens barrel 36. The interchangeable lens 3 includes a lens group, an aperture, etc., although not shown, inside the lens barrel 36. The lens group includes a focus lens that changes the focal position by moving in the optical axis direction, and the like. Moreover, the interchangeable lens 3 has a control device having an internal blur correction function.

The camera body 2 includes an annular mount portion Mt, on which the interchangeable lens 3 is mounted, at approximately the center of the front surface. The camera body 2 includes an attachment/detachment button 89 for attaching and detaching the interchangeable lens 3 near the annular mount portion Mt.

Furthermore, the camera body 2 includes a grip section 14 on the front left end portion for the photographer to grasp. A release button 11 for instructing the start of exposure is provided on the top surface of the grip section 14.

Inside the grip part 14, although not shown, a battery storage chamber, a card storage chamber, etc. are provided. The battery storage chamber stores, for example, a lithium ion battery (not shown) as a power source for the camera. The card storage chamber removably stores a memory card (not shown) for recording photographed image data.

The release button 11 is a two-stage detection button that can detect two states: a half-pressed state S1 and a fully-pressed state S2. The release button 11 receives a photographing preparation command D1 and a photographing start command D2 according to the detection results of both states S1 and S2.

When the release button 11 is pressed halfway and enters the halfway pressed state S1, the camera system 1 determines that a shooting preparation command (also referred to as an exposure preparation command) D1 has been given by the operator.

Then, in response to the shooting preparation command D1, preparation operations (for example, AF (Auto Focus) control operation and AE (Auto Exposure) control operation, etc.) for acquiring a recording still image (main shooting image) regarding the subject are performed. It will be done.

Furthermore, when the release button 11 is pushed further to reach the fully pressed state S2, the camera system 1 determines that a shooting start command (also referred to as an exposure start command) D2 has been given.

Then, in response to the photographing start command D2, the photographing operation of the main photographed image is performed. The photographing operation includes, for example, an exposure operation regarding a subject image (a light image of the subject) using an image sensor (not shown), and a series of operations for performing predetermined image processing on the image signal obtained by the exposure operation. .

In FIG. 2, a finder window (eyepiece window) 10 is provided at approximately the upper center of the back surface of the camera body 2. By looking through the finder window 10, the photographer can visually recognize the light image of the subject guided from the interchangeable lens 3 and determine the composition. That is, the photographer can determine the composition using the optical finder.

In FIG. 2, a rear monitor 12 is provided approximately at the center of the rear surface of the camera body 2. The rear monitor 12 is configured, for example, as a color liquid crystal display (LCD).

The rear monitor 12 can display a menu screen for setting shooting conditions and the like. Further, the rear monitor 12 can play back and display photographed images recorded on the memory card 90 in playback mode. Further, the rear monitor 12 can display an image to be photographed (live view video).

A direction selection key 84 is provided on the right side of the rear monitor 12. This direction selection key 84 has a circular operation button. This operation button is configured to be able to detect pressing operations in four directions: up, down, left, and right, and pressing operations in four directions, upper right, upper left, lower right, and lower left.

Note that the direction selection key 84 also detects the pressing operation of the central push button, in addition to the pressing operations in the eight directions described above.

Note that although not shown here, the camera body 2 includes an image sensor that captures a captured image, and a control device that controls the image sensor and performs image processing on an image signal. The control device has a shake correction function that corrects shake of the camera body 2.

(assignment)
As described above, in the camera system 1 according to the present embodiment, the camera body 2 and the interchangeable lens 3 each have a blur correction function. As described above, when the camera body 2 and the interchangeable lens 3 are each equipped with a blur correction function, a method is known in which the blur correction of the camera system 1 is realized by coordinating both blur correction functions.

In this case, the blur correction function of the camera body 2 and the blur correction function of the interchangeable lens 3 each operate by sharing the amount of correction. This expands the blur correction range of the camera system 1, allowing the camera system 1 to correct larger blurs.

However, if there is a performance difference between the image stabilization functions of the camera body 2 and the interchangeable lens 3, it is better to use the high-performance image stabilization function alone to correct the image blur in the camera system 1 than when they work together to correct the image blur. It may be higher. This is because when the shake correction functions of the camera body 2 and the interchangeable lens 3 cooperate to perform shake correction, a high-performance shake correction function is affected by a poor shake correction function.

In this way, if there is a performance difference between the image stabilization functions of the camera body 2 and the interchangeable lens 3, the image stabilization function with high performance will be affected by the poor image stabilization function, and the image stabilization performance of the entire camera system 1 will decrease. There is a risk that

(Overview of proposed technology)
Therefore, the camera system 1 according to the embodiment of the present disclosure includes a camera body 2 equipped with a first shake correction function and an interchangeable lens 3 equipped with a second shake correction function.

The camera system 1 acquires lens performance information regarding the performance of the second blur correction function of the interchangeable lens 3. The camera system 1 acquires camera performance information regarding the performance of the first blur correction function of the camera body 2.

The camera system 1 compares lens performance information and camera performance information. Based on the comparison result, the camera system 1 determines whether to perform blur correction on one of the interchangeable lens 3 and the camera body 2, or to cause the interchangeable lens 3 and the camera body 2 to perform blur correction together.

In this way, the camera system 1 compares the performances of the interchangeable lens 3 and the camera body 2 regarding blur correction, and determines whether to perform the blur correction independently or in cooperation.

Thereby, the camera system 1 can perform blur correction on either the interchangeable lens 3 or the camera body 2 when there is a large difference in performance regarding blur correction between the interchangeable lens 3 and the camera body 2. Therefore, the camera system 1 can suppress deterioration in performance of blur correction that may occur when blur correction is operated alone.

In addition, the camera system 1 can perform blur correction in cooperation with both the interchangeable lens 3 and the camera body 2 when the difference in performance regarding blur correction between the interchangeable lens 3 and the camera body 2 is small. Therefore, the camera system 1 can correct even larger shakes.

In this way, the camera system 1 according to the embodiment of the present disclosure can further improve the performance of blur correction.

<<2. Camera system configuration example >>
<2.1. Example of functional configuration of camera system>
FIG. 3 is a block diagram showing an example of the functional configuration of the camera system 1 according to the embodiment of the present disclosure. As shown in FIG. 3, the camera system 1 includes a camera body 2 and an interchangeable lens 3.

[Interchangeable lens 3]
As shown in FIG. 3, the interchangeable lens 3 includes a lens group 37, a control device 38, and a shake correction mechanism 40.

The lens group 37 is an example of an optical system that receives incident light and forms its image on the light receiving surface of the image sensor 5. The lens group 37 can include a plurality of lenses, such as a focus lens. The focus lens is a lens that changes the focal position of the interchangeable lens 3 by moving in the optical axis direction.

The shake correction mechanism 40 drives the lens group 37 and optically corrects shake of the camera system 1. The shake correction mechanism 40 corrects, for example, camera shake during photographing. The shake correction mechanism 40 corrects shake under control from the control device 38.

The control device 38 controls each part of the interchangeable lens 3. The control device 38 includes a lens position detection section 39 and a blur correction control section 41.

The lens position detection unit 39 detects the position of the focus lens of the lens group 37. The lens position detection unit 39 outputs data regarding the detected position of the focus lens to the camera body 2.

The shake correction control section 41 controls the shake correction mechanism 40. The shake correction control unit 41 controls the shake correction mechanism 40 according to instructions from the camera body 2, for example. Thereby, the camera system 1 can perform blur correction on the interchangeable lens 3 side.

[Camera body 2]
The camera body 2 includes a shutter 4, an image sensor 5, a mirror mechanism 6, a shake correction mechanism 7, a control device 8, a rear monitor 12, a gyro sensor 61, an operation section 80, a memory card 90, Equipped with

(Shutter 4)
The shutter 4 controls the light irradiation period and the light blocking period to the camera body 2 by opening and closing.

(Image sensor 5)
The image sensor 5 photoelectrically converts an optical image of a subject to generate an image signal. Specifically, an image sensor (herein, a CCD (Charge Coupled Device) sensor (also simply referred to as a CCD)) 5 converts an optical image of a subject into an electrical signal by a photoelectric conversion function, and generates an image signal related to the main photographed image. (image signal for recording) is generated.

Note that although the image sensor 5 is assumed to be a CCD here, the image sensor is not limited to this. For example, the image sensor 5 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor or the like.

(Mirror mechanism 6)
Although not shown, the mirror mechanism 6 includes a main mirror (main reflecting surface) and a submirror (sub reflecting surface).

In the state where the mirror mechanism 6 blocks the optical path (mirror down state), the main mirror and submirror of the mirror mechanism 6 are arranged on the optical path of the light beam. The light flux (subject image) from the interchangeable lens 3 is reflected by the main mirror toward the top of the camera, and then further reflected by a pentamirror (not shown) placed at the top of the camera body 2, and is used as a light flux for observation. The camera is guided to the finder window 10 (see FIG. 2).

Further, a part of the light beam from the interchangeable lens 3 is reflected by the sub-mirror, guided to the control device 8, and used for AF operation. More specifically, a part of this light speed is guided to the AF module 20 of the control device 8, which is disposed at the bottom of the camera body 2, and is used for AF operation.

On the other hand, when the mirror mechanism 6 is retracted from the optical path (mirror up state), the main mirror and the sub-mirror are retracted from the optical path of the subject image from the interchangeable lens 3, and the subject image is directed toward the shutter 4 and the image sensor 5. and proceed.

Here, it is assumed that the camera system 1 is a single-lens reflex type digital camera with interchangeable lenses, but the camera system 1 may be a mirrorless type digital camera with interchangeable lenses. In this case, the mirror mechanism may be omitted.

(Shake correction mechanism 7)
The blur correction mechanism 7 drives the image sensor 5 and optically corrects the blur of the camera system 1. The shake correction mechanism 7 corrects, for example, camera shake during photographing. The blur correction mechanism 7 corrects blur under control from the control device 8.

Note that when distinguishing between the image stabilization mechanism 7 of the camera body 2 and the image stabilization mechanism 40 of the interchangeable lens 3, the image stabilization mechanism 7 of the camera body 2 is referred to as the body-side image stabilization mechanism 7, and The blur correction mechanism 40 will be referred to as a lens-side blur correction mechanism 40.

(Rear monitor 12)
The rear monitor 12 is a display device that displays photographed images and the like. The rear monitor 12 is arranged, for example, on the rear surface of the camera body 2 (see FIG. 2). Although FIG. 3 shows a case where the back monitor 12 is an LCD (Liquid Crystal Display), the back monitor 12 is not limited to an LCD. The back monitor 12 may be, for example, a display device such as an organic EL (Electro Luminescence) display.

(gyro sensor 61)
The gyro sensor 61 is an angular velocity sensor that detects the angular velocity of the camera system 1. The camera system 1 uses a gyro sensor 61 to detect blur. The camera system 1 corrects the blur detected by the gyro sensor 61 using the blur correction mechanism 7.

(Operation unit 80)
The operation unit 80 includes various buttons and switches including the release button 11 (see FIG. 1). In response to a user's input operation on the operation unit 80, the control device 8 realizes various operations.

(Memory card 90)
The memory card 90 is removably stored, for example, in a card storage chamber inside the grip portion 14 (see FIG. 1). The memory card 90 stores photographed images and the like. The memory card 90 functions as a storage means of the camera system 1, for example. Note that the camera system 1 may include storage means other than the memory card 90.

(Control device 8)
The control device 8 controls each part of the camera body 2. The camera body 2 functions as an information processing device by mounting the control device 8 thereon. Note that when distinguishing between the control device 8 of the camera body 2 and the control device 38 of the interchangeable lens 3, the control device 8 of the camera body 2 will be referred to as the body-side control device 8, and the control device 38 of the interchangeable lens 3 will be referred to as the body-side control device 8. It will be referred to as a lens-side control device 38.

The control device 8 includes an AF module 20, a focus control section 121, a mirror control section 122, a shutter control section 123, a timing control circuit 124, a signal processing circuit 51, an A/D conversion circuit 52, and a digital signal. It includes a processing circuit 50 and an overall control section 101.

(AF module 20)
The AF module 20 uses, for example, light that has entered through the mirror mechanism 6 to detect the focused state of the subject using a focused state detection method such as a phase difference method. The AF module 20 detects the focused state of the subject according to instructions from the overall control unit 101. The AF module 20 outputs the detected in-focus state of the subject to the overall control unit 101.

(Focus control unit 121)
The focus control section 121 generates a control signal for driving the motor M1 based on the signal input from the overall control section 101. The focus control unit 121 moves the focus lens included in the lens group 37 of the interchangeable lens 3 by driving the motor M1 using the control signal. The focus control unit 121 controls the movement of the focus lens in the optical axis direction according to instructions from the overall control unit 101.

(Mirror control unit 122)
The mirror control unit 122 controls state switching between a state in which the mirror mechanism 6 is retracted from the optical path (mirror up state) and a state in which the mirror mechanism 6 blocks the optical path (mirror down state). The mirror control unit 122 generates a control signal for driving the motor M2 based on the signal input from the overall control unit 101. The mirror control unit 122 switches between the mirror up state and the mirror down state by driving the motor M2 using the generated control signal.

(Shutter control unit 123)
The shutter control section 123 generates a control signal for controlling the motor M3 based on the signal input from the overall control section 101. The shutter control unit 123 controls opening and closing of the shutter 4 by driving the motor M3 using the generated control signal.

(Timing control circuit 124)
The timing control circuit 124 performs timing control on the image sensor 5 and the like based on a signal input from the overall control section 101. The timing control circuit 124 includes, for example, a timing generator that generates various timing signals. The timing control circuit 124 controls the image sensor 5, the signal processing circuit 51, and the A/D conversion circuit 52 based on various timing signals generated by the timing generator.

(Signal processing circuit 51)
The signal processing circuit 51 performs signal processing on the image signal input from the image sensor 5. The signal processing circuit 51 performs signal processing on the analog image signal and outputs it to the A/D conversion circuit 52 .

(A/D conversion circuit 52)
The A/D conversion circuit 52 converts the analog image signal input from the signal processing circuit 51 into a digital image signal (digital image data). The A/D conversion circuit 52 outputs the converted digital image data to the digital signal processing circuit 50.

(Digital signal processing circuit 50)
The digital signal processing circuit 50 performs digital signal processing on the image data input from the A/D conversion circuit 52 to generate image data related to the captured image. The digital signal processing circuit 50 shown in FIG. 3 includes a black level correction circuit 53, a white balance (S) circuit 54, a γ correction circuit 55, and an image memory 56.

The black level correction circuit 53 corrects the black level of each pixel data forming the image data output by the A/D conversion circuit 52 to a reference black level. The WB circuit 54 performs white balance adjustment of the image.

The γ correction circuit 55 performs gradation conversion of the captured image. The image memory 56 is a high-speed accessible image memory for temporarily storing generated image data, and has a capacity capable of storing multiple frames of image data.

During actual shooting, the image data temporarily stored in the image memory 56 is subjected to appropriate image processing (including compression processing, etc.) in the overall control unit 101, and then stored in the memory card 90.

Further, the image data temporarily stored in the image memory 56 is appropriately transferred to a VRAM (not shown) by the overall control unit 101, and an image based on the image data is displayed on the rear monitor 12. As a result, a confirmation display (after view) for confirming the photographed image, a playback display for reproducing the photographed image, and the like are realized.

Note that the processing performed by the digital signal processing circuit 50 is not limited to the processing of each part shown in FIG. At least a part of the processing of each section shown in FIG. 3 may be omitted, and processing other than the processing of each section shown in FIG. 3 may be performed by the digital signal processing circuit 50.

(Overall control unit 101)
The overall control unit 101 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and uses the RAM as a work memory to control the camera system according to a program stored in the ROM, for example. 1. Controls the entire operation.

For example, the overall control section 101 includes a shake correction control section 21. The shake correction control unit 41 generates a correction control signal for optically correcting the shake detected by the gyro sensor 61 or the like (shake of the camera system 1 ), and outputs it to the shake correction mechanism 7 . The blur correction mechanism 7 corrects blur in the camera system 1 by driving the image sensor 5 based on the correction control signal.

Note that when distinguishing between the shake correction control section 21 of the camera body 2 and the shake correction control section 41 of the interchangeable lens 3, the shake correction control section 21 of the camera body 2 will be referred to as a body-side shake correction control section 21, The shake correction control section 41 of the interchangeable lens 3 will be referred to as a lens side shake correction control section 41.

Further, the overall control unit 101 cooperates with the AF module 20, the focus control unit 121, and the like to perform a focus control operation to control the position of the focus lens. The overall control unit 101 implements an automatic focusing operation (AF operation) using the focus control unit 121 according to the in-focus state of the subject detected by the AF module 20.

<2.2. An example of a shake correction mechanism>
As described above, in the camera system 1, the body side shake correction mechanism 7 and the lens side shake correction mechanism 40 perform shake correction.

An overview of blur correction by the body-side blur correction mechanism 7 will be explained using FIG. 4. Here, blur correction by the body-side blur correction mechanism 7 will be described, but the lens-side blur correction mechanism 40 can also perform blur correction in the same manner as the body-side blur correction mechanism 7. The body-side shake correction mechanism 7 drives the image sensor 5 to perform shake correction, while the lens-side shake correction mechanism 40 drives the lens group 37 to perform shake correction.

FIG. 4 is a diagram showing a schematic configuration of the body-side shake correction mechanism 7. The body-side blur correction mechanism 7 shown in FIG. 4 includes a base portion 7a, a first moving portion 7b, and a second moving portion 7c.

The base portion 7a is fixed near the back portion inside the camera body 2. Further, the first moving section 7b is movable in the X direction relative to the base section 7a, and the second moving section 7c is movable in the Y direction relative to the first moving section 7b. The image sensor 5 is fixed to the second moving section 7c.

The base portion 7a has an actuator 7x. The actuator 7x is a drive mechanism called SIDM (SmoothImpactDriveMechanism). The SIDM is configured with a piezoelectric element. By repeating the expansion and contraction operations of the piezoelectric element at a high speed frequency, the actuator 7x can drive the first moving section 7b in the X direction with respect to the base section 7a.

Furthermore, the first moving section 7b has an actuator 7y. The actuator 7y is also composed of an SIDM similar to the actuator 7x. As the piezoelectric element of the actuator 7y repeats expansion and contraction operations at a high speed frequency, the actuator 7y can drive the second moving section 7c in the Y direction with respect to the first moving section 7b.

As described above, the image sensor 5 is driven in the X direction by the actuator 7x, and in the Y direction by the actuator 7y. As a result, the image sensor 5 fixed to the second moving section 7c can be moved relative to the base section 7a in the X direction and the Y direction by the

actuators

7x and 7y.

Then, the body-side shake correction control section 21 drives the image sensor 5 with respect to the base section 7a using the

actuators

7x and 7y based on the signal (shake detection result) detected by the gyro sensor 61 (angular velocity sensor) etc. do. The body-side blur correction control section 21 uses the detection result from the lens position detection section 39 to control the position of the image sensor 5 according to a feedback control law or the like. This suppresses blur in the camera system 1. That is, blur correction is realized.

<2.3. Configuration example of body-side image stabilization section>
As described above, the camera system 1 according to the present embodiment performs image stabilization either independently or cooperatively depending on the difference in performance between the body-side image stabilization mechanism 7 and the lens-side image stabilization mechanism 40. Decide whether to do so. More specifically, the body-side shake correction control section 21 of the camera system 1 makes this determination.

Note that the stand-alone operation of shake correction is an operation in which shake correction is performed by operating one of the body-side shake correction mechanism 7 and the lens-side shake correction mechanism 40 alone. Further, the cooperative operation of blur correction is an operation in which the body-side blur correction mechanism 7 and the lens-side blur correction mechanism 40 each share the correction amount to perform blur correction.

The cooperative operation of blur correction is broadly classified into two types: MasterSlave type and autonomous cooperative type. In the MasterSlave type, for example, the camera body 2 controls the lens-side shake correction mechanism 40 to perform cooperative motion of shake correction.

In this case, for example, the body-side shake correction control unit 21 determines the correction amounts of the body-side shake correction mechanism 7 and the lens-side shake correction mechanism 40. The body-side shake correction control section 21 outputs a correction control signal including this correction amount to the body-side shake correction mechanism 7 and the lens-side shake correction mechanism 40.

In the case of the autonomous cooperative type, the body-side blur correction control unit 21 acquires the blur detection result (or correction angle) from the interchangeable lens 3. The body-side blur correction control unit 21 determines a correction amount ratio (distribution gain) based on the body-side blur detection result and the lens-side blur detection result, and notifies the lens-side blur correction control unit 41 of the ratio.

The body-side image stabilization control section 21 controls the body-side image stabilization mechanism 7 according to the determined ratio, and the lens-side image stabilization control section 41 controls the lens-side image stabilization mechanism 40 according to the notified ratio. do.

In the following, when the camera system 1 performs a cooperative operation in blur correction, it is assumed that the camera system 1 performs an autonomous cooperative type cooperative operation.

FIG. 5 is a block diagram illustrating a configuration example of the body-side blur correction control section 21 according to the embodiment of the present disclosure. The body-side blur correction control unit 21 shown in FIG. 5 includes an acquisition unit 211, a performance determination unit 212, a ratio calculation unit 213, and a cooperation determination unit 214.

(Acquisition unit 211)
The acquisition unit 211 acquires various data that the body-side blur correction control unit 21 uses to control blur correction. The acquisition unit 211 acquires, for example, an index (an example of lens performance information or camera performance information) regarding the correction performance of the body-side vibration correction mechanism 7 and the lens-side vibration correction mechanism 40. The index regarding the correction performance is, for example, a value indicating the amount of blur that can be corrected by the body-side blur correction mechanism 7 and the lens-side blur correction mechanism 40.

Additionally, the acquisition unit 211 acquires information regarding the focal length. The information regarding the focal length is, for example, the value of the focal length determined by the overall control unit 101. The acquisition unit 211 acquires the movable range of the body-side blur correction mechanism 7 and the movable range of the lens-side blur correction mechanism 40. The movable range of the body-side shake correction mechanism 7 is, for example, a range in which the image sensor 5 can be driven. The movable range of the lens-side shake correction mechanism 40 is a range in which the lens group 37 can be driven.

The acquisition unit 211 acquires information regarding shutter speed. The shutter speed is determined by pressing the shutter button (release button 11 in FIG. 1) by the photographer. The acquisition unit 211 acquires information regarding the shutter speed from the overall control unit 101, for example, when the shutter button is pressed.

The acquisition unit 211 outputs the acquired correction performance to the performance determination unit 212. The acquisition unit 211 outputs the acquired range of movement to the ratio calculation unit 213. The acquisition unit 211 outputs the acquired information regarding the correction performance, movable range, focal length, and shutter speed to the cooperation determination unit 214.

(Performance judgment unit 212)
The performance determination unit 212 calculates the difference between the correction performance of the body-side vibration correction mechanism 7 and the correction performance of the lens-side vibration correction mechanism 40 acquired by the acquisition unit 211. The performance determination unit 212 compares the calculated difference (performance difference) with a first threshold Th1. The performance determination unit 212 outputs the comparison result to the cooperation determination unit 214.

(Ratio calculation unit 213)
The ratio calculating unit 213 calculates a correction ratio when blur correction is performed cooperatively from the movable range of the body-side blur correction mechanism 7 and the movable range of the lens-side blur correction mechanism 40 acquired by the acquisition unit 211.

For example, the ratio calculation unit 213 calculates the image stabilization of the body-side image stabilization mechanism 7 based on the ratio of the movable range of the body-side image stabilization mechanism 7 and the movement range of the lens-side image stabilization mechanism 40 acquired by the acquisition unit 211. The ratio and the blur correction ratio of the lens side blur correction mechanism 40 are determined.

The ratio calculation unit 213 outputs the calculated blur correction ratio to the cooperation determination unit 214.

(Cooperation determination unit 214)
The cooperation determination unit 214 determines whether or not to perform blur correction in a cooperative manner. That is, the cooperation determination unit 214 causes either one of the body-side image stabilization mechanism 7 and the lens-side image stabilization mechanism 40 to perform the image stabilization independently, or both the body-side image stabilization mechanism 7 and the lens-side image stabilization mechanism 40 operate the image stabilization. to decide whether to perform cooperative operation.

If the cooperation determination unit 214 determines that there is a difference in the correction performance of the body-side vibration reduction mechanism 7 and the lens-side vibration reduction mechanism 40 based on the comparison result of the performance determination unit 212, the cooperation determination unit 214 determines to operate the vibration correction independently. .

Specifically, the cooperation determination unit 214 determines to operate the shake correction independently when the performance difference between the body-side shake correction mechanism 7 and the lens-side shake correction mechanism 40 is equal to or greater than the first threshold Th1.

If it is determined to operate independently, the cooperation determination unit 214 determines that blur correction is to be performed by the body-side blur correction mechanism 7 or the lens-side blur correction mechanism 40, whichever has higher correction performance.

In this way, in the camera system 1, when there is a large difference in correction performance between the body-side image stabilization mechanism 7 and the lens-side image stabilization mechanism 40, the camera system 1 performs image stabilization using only the image stabilization mechanism with the higher correction performance. Thereby, the camera system 1 can suppress deterioration of blur correction performance, and can perform blur correction using a shake correction mechanism with higher performance.

On the other hand, if the shake is large, there is a possibility that the camera system 1 will not be able to correct the shake by operating either the body-side shake correction mechanism 7 or the lens-side shake correction mechanism 40 alone. In this way, when the shake exceeds the movable range of the body-side shake correction mechanism 7 and the lens-side shake correction mechanism 40, it is desirable that the body-side shake correction mechanism 7 and the lens-side shake correction mechanism 40 cooperate to correct the shake. .

For example, suppose that the camera system 1 performs shake correction in a single operation, and switches to a cooperative operation after the shake can no longer be fully corrected in this single operation. That is, when one of the body-side image stabilization mechanism 7 and the lens-side image stabilization mechanism 40 is performing image stabilization independently and the movable range of one reaches its limit, the body-side image stabilization mechanism 7 and the lens-side image stabilization mechanism 40 40 cooperate to perform blur correction.

In this way, if the independent operation is switched to the cooperative operation while blur correction is being performed, there is a risk that the correction performance will deteriorate at the time of switching.

Therefore, the cooperation determination unit 214 according to the embodiment of the present disclosure estimates in advance the blur caused by photographing, and determines whether or not to perform a cooperative action according to the estimated amount of blur (hereinafter also referred to as expected amount of blur). do.

That is, if the correction range (movable range) is sufficient even if the shake correction mechanism with high performance performs shake correction alone, the cooperation determination unit 214 determines that the shake correction is performed with the high performance shake correction mechanism alone. .

On the other hand, if it is assumed that the shake is so large that the correction range (movable range) is insufficient if the high-performance shake correction mechanism performs shake correction alone, the cooperation determination unit 214 determines whether the body side shake correction mechanism 7 and the lens side shake are corrected. It is determined that both of the correction mechanisms 40 cooperate to perform blur correction.

When shooting still images, the amount of blur changes depending on the shutter speed. For example, the slower the shutter speed, the more blurring occurs. On the other hand, the faster the shutter speed, the less blurring occurs. In this way, it is possible to predict how much blur will occur depending on the shutter speed in the case of normal camera shake.

Therefore, the cooperation determination unit 214 estimates the expected amount of blur based on the information regarding the shutter speed acquired by the acquisition unit 211. For example, it is assumed that the shutter speed and the expected amount of blur are associated in advance and stored as a correspondence in a storage unit (not shown). Based on this correspondence, the cooperation determination unit 214 estimates the expected amount of blur from the shutter speed.

Alternatively, the cooperation determination unit 214 may estimate the expected amount of blur according to the shutter speed and focal length. When shooting still images, blur is more likely to occur depending on the focal length as well as the shutter speed.

Therefore, the cooperation determination unit 214 estimates the expected amount of blur based on the information regarding the shutter speed and the information regarding the focal length acquired by the acquisition unit 211. For example, it is assumed that the shutter speed, focal length, and estimated amount of blur are associated in advance and stored in a storage unit (not shown) as a correspondence relationship. Based on this correspondence, the cooperation determination unit 214 estimates the expected amount of blur from the shutter speed and focal length.

The cooperation determination unit 214 determines whether or not blur correction should be performed in a cooperative manner according to the estimated expected amount of blur. For example, the cooperation determination unit 214 determines whether or not to perform a cooperative operation of blur correction depending on whether the estimated amount of shake is less than the second threshold Th2. The second threshold Th2 is, for example, a value determined depending on the movable range of the body-side blur correction mechanism 7 and the lens-side blur correction mechanism 40, whichever has higher performance.

If the expected amount of blur is less than the second threshold Th2, the cooperation determination unit 214 determines to perform blur correction in an independent operation. On the other hand, the cooperation determination unit 214 determines that the blur correction should be performed in a cooperative manner when the estimated amount of blur is equal to or greater than the second threshold Th2.

In this way, the cooperation determination unit 214 determines whether the correction amount (correction angle) is one of the body side shake correction mechanism 7 and the lens side shake correction mechanism 40 based on the expected shake amount, in other words, the shutter speed and focal length at the time of shooting. It is determined whether or not a single correction is sufficient. If an independent correction is sufficient, the cooperation determination unit 214 determines blur correction using an independent operation. If the single correction is insufficient, the cooperation determining unit 214 determines blur correction through cooperative motion.

If it is determined to perform cooperative operation, the cooperation determination unit 214 determines that the body-side vibration correction mechanism 7 and the lens-side vibration correction mechanism 40 perform vibration correction using the correction ratio calculated by the ratio calculation unit 213.

The cooperation determination unit 214 instructs at least one of the body-side blur correction mechanism 7 and the lens-side blur correction mechanism 40 to perform correction using the determined correction content. If it is determined to operate independently, the cooperation determining unit 214 instructs the blur correction mechanism that has been determined to operate independently to perform blur correction. If it is determined that the cooperative operation is to be performed, the cooperation determination unit 214 instructs both the body-side blur correction mechanism 7 and the lens-side blur correction mechanism 40 to perform blur correction.

In this way, if there is a large difference in the blur correction performance of the body-side blur correction mechanism 7 and the lens-side blur correction mechanism 40, the camera system 1 determines that the blur correction mechanism with the higher performance performs shake correction alone. In addition, even if there is a large difference in the camera system 1's image stabilization performance, it is assumed that large amounts of shaking will not be within the correction range of each individual camera system.In other words, there is a possibility that the expected shaking cannot be sufficiently corrected by each individual camera system. If so, it is decided to perform blur correction in cooperation.

Thereby, even if there is a difference in correction performance between the camera body 2 and the interchangeable lens 3, the camera system 1 can further expand the correction range of blur correction while suppressing deterioration of the blur correction performance.

<<3. Judgment processing example >>
FIG. 6 is a flowchart illustrating an example of the flow of determination processing according to the embodiment of the present disclosure. The determination process in FIG. 6 is executed by the camera body 2, for example, before the blur correction process during still image shooting.

As shown in FIG. 6, the camera body 2 acquires the blur correction performance of the camera body 2 and the interchangeable lens 3 (step S101).

Next, the camera body 2 calculates the performance difference between the acquired correction performances (step S102). The camera body 2 determines whether the calculated performance difference is greater than or equal to the first threshold Th1 (step S103).

If the performance difference is less than the first threshold Th1 (step S103; No), the camera body 2 acquires the focal length (step S104). The camera body 2 obtains the movable range of the camera body 2 and the interchangeable lens 3 in blur correction (step S105).

Based on the acquired movable range, the camera body 2 calculates a correction ratio when blur correction is performed through cooperative motion (step S106). Next, the camera body 2 determines cooperative blur correction between the interchangeable lens 3 (lens) and the camera body 2 (body) according to the calculated correction ratio (step S107). That is, the camera body 2 determines that the interchangeable lens 3 and the camera body 2 cooperate to perform blur correction, and the process ends.

If the performance difference is greater than or equal to the first threshold Th1 (step S103; Yes), the camera body 2 acquires the focal length (step S108). The camera body 2 obtains the movable range of the camera body 2 and the interchangeable lens 3 in blur correction (step S109).

Based on the acquired movable range, the camera body 2 calculates a correction ratio when blur correction is performed by cooperative motion (step S110).

Next, the camera body 2 determines whether the shutter button (release button 11) has been pressed (step S111).

If the shutter button is not pressed (step S111; No), the camera body 2 returns to step S108. Alternatively, the camera body 2 may return to step S111 and wait for the shutter button to be pressed.

If the shutter button is pressed (step S111; Yes), the camera body 2 acquires the shutter speed (step S112).

The camera body 2 estimates the expected amount of blur according to the shutter speed and/or focal length (step S113). The camera body 2 determines whether the estimated amount of blur is less than the second threshold Th2 (step S114).

If the estimated amount of blur is equal to or greater than the second threshold Th2 (step S114; No), the camera body 2 proceeds to step S107 and determines blur correction by cooperative operation.

On the other hand, if the estimated amount of shake is less than the second threshold Th2 (step S114; Yes), the camera body 2 determines to perform shake correction independently, and determines whether to perform shake correction on the lens side, that is, the interchangeable lens 3. (Step S115). For example, if the correction performance of the interchangeable lens 3 is higher than the correction performance of the camera body 2, the camera body 2 determines to perform blur correction on the lens side.

If it is determined that blur correction is to be performed on the lens side (step S115; Yes), the camera body 2 determines blur correction for the lens alone (step S116), and ends the process.

If it is determined that the camera body 2 does not perform shake correction on the lens side (step S115; No), the camera body 2 determines shake correction for the body alone (step S117), and ends the process.

As described above, in the camera system 1 according to the embodiment of the present disclosure, when the difference between the image stabilization performance on the camera body 2 side and the image stabilization performance on the interchangeable lens 3 side is greater than or equal to the first threshold Th1, Perform image stabilization. Thereby, the camera system 1 can suppress deterioration of correction performance due to cooperative blur correction.

Furthermore, even if the difference in correction performance is greater than or equal to the first threshold Th1, if the expected amount of blur is greater than or equal to the second threshold Th2, the camera system 1 performs blur correction in a cooperative manner rather than independently. . Thereby, the camera system 1 can correct larger shakes. Furthermore, before performing shake correction, the camera system 1 uses the estimated shake amount to determine whether to perform shake correction independently or in cooperation. As a result, switching from independent blur correction to cooperative blur correction is less likely to occur while blur correction is being performed, and the camera system 1 can suppress performance deterioration of blur correction.

<<4. Modified example >>
In the embodiment described above, it is assumed that the body-side shake correction control unit 21 of the camera system 1 acquires the correction performance from the camera body 2 and the interchangeable lens 3, but the present invention is not limited to this. For example, the body-side blur correction control unit 21 may calculate the correction performance. This point will be explained as a modified example.

In this modification, the body-side shake correction control unit 21A determines whether to perform shake correction independently or in cooperation, depending on the correction performance of the camera body 2 and the interchangeable lens 3.

Since the performance of image stabilization changes depending on the focal length and shutter speed, for example, the body-side image stabilization control unit 21A adjusts the correction performance of the camera body 2 and the correction performance of the interchangeable lens 3 depending on the focal length and shutter speed. Calculate.

That is, in this modification, the body-side shake correction control unit 21A compares the correction performance of the camera body 2 and the interchangeable lens 3 based on information regarding the focal length and shutter speed. Thereby, the camera system 1 can compare the blur correction performance under each condition, regardless of the focal length or shutter speed.

<4.1. Configuration example of body-side image stabilization control section>
FIG. 7 is a block diagram illustrating a configuration example of a body-side blur correction control unit 21A according to a modification of the embodiment of the present disclosure. The body-side blur correction control unit 21A shown in FIG. 7 includes an acquisition unit 211A instead of the acquisition unit 211 in FIG. 214A. Further, the body-side blur correction control section 21A shown in FIG. 7 further includes a performance calculation section 215.

(Acquisition unit 211A)
The acquisition unit 211A acquires information regarding performance from the camera body 2 and the interchangeable lens 3, respectively. In this modification, the acquisition unit 211A acquires correction performance at multiple focal lengths and multiple shutter speeds.

For example, the acquisition unit 211A acquires the correction performance of the interchangeable lens 3 at each of the T (tele) end and the W (wide) end. At this time, the acquisition unit 211A acquires the correction performance of the interchangeable lens 3 at different shutter speeds. Note that the T end is the state where the focal length of the interchangeable lens 3 is the longest, and the W end is the state where the focal length of the interchangeable lens 3 is the shortest.

More specifically, the acquisition unit 211A acquires the first lens correction performance of the interchangeable lens 3 at the first shutter speed at the T end. The acquisition unit 211A also acquires the second lens correction performance of the interchangeable lens 3 at the second shutter speed at the T end. The acquisition unit 211A acquires the third lens correction performance of the interchangeable lens 3 at the first shutter speed at the W end. The acquisition unit 211A also acquires the fourth lens correction performance of the interchangeable lens 3 at the second shutter speed at the W end.

Alternatively, the acquisition unit 211A may acquire information regarding the shutter speed (first shutter speed) that provides a predetermined lens correction performance at the T end. Similarly, the acquisition unit 211A may acquire information regarding the shutter speed (second shutter speed) that provides a predetermined lens correction performance at the W end.

Furthermore, the acquisition unit 211A acquires the correction performance of the camera body 2 at each of the T (tele) end and the W (wide) end. At this time, the acquisition unit 211A acquires the correction performance of the camera body 2 at different shutter speeds.

More specifically, the acquisition unit 211A acquires the first body correction performance of the camera body 2 at the third shutter speed at the T end. The acquisition unit 211A also acquires the second body correction performance of the camera body 2 at the fourth shutter speed at the T end. The acquisition unit 211A acquires the third body correction performance of the camera body 2 at the third shutter speed at the W end. The acquisition unit 211A also acquires the fourth body correction performance of the camera body 2 at the fourth shutter speed at the W end.

Alternatively, the acquisition unit 211A may acquire information regarding the shutter speed (third shutter speed) that provides a predetermined body correction performance at the T end. Similarly, the acquisition unit 211A may acquire information regarding a shutter speed (fourth shutter speed) that provides a predetermined body correction performance at the W end.

The acquisition unit 211A outputs the acquired information regarding the correction performance (first to fourth lens correction performances and first to fourth body correction performances) to the performance calculation unit 215.

Note that the acquisition unit 211A has the same functions as the acquisition unit 211 shown in FIG. 5, except for acquiring correction performance at multiple focal lengths and multiple shutter speeds.

(Performance calculation unit 215)
The performance calculation unit 215 shown in FIG. 7 calculates the correction performance of the camera body 2 and the correction performance of the interchangeable lens 3 based on the shutter speed and focal length of the camera system 1.

Here, the relationship between shutter speed, focal length, and correction performance will be explained using FIG. 8. FIG. 8 is a diagram for explaining the relationship between shutter speed and focal length and correction performance according to a modification of the embodiment of the present disclosure.

As shown in FIG. 8, for example, assume that at the first focal length _fT , the first Tv value that is the first amount of blur _BrL is Tv _T1 . Further, assume that at the first focal length _fT , the second Tv value that becomes the second amount of blur _BrH is Tv _T2 .

Further, for example, assume that at the second focal length fw, the third Tv value that is the first amount of blur Br _L is Tv _W1 . Further, it is assumed that at the first focal length _fT , the fourth Tv value that becomes the second blur amount _BrH is _TvW2 .

Here, when the shake amount Br is expressed as a logarithm, the first Tv value Tv _T1 and the second Tv value Tv _T2 are plotted as points near the straight line L1. Further, the third Tv value Tv _W1 and the fourth Tv value Tv _W2 are plotted as points near the straight line L2.

In this way, when the amount of blur Br is expressed logarithmically, the amount of blur Br at different shutter speeds (Tv values) at the same focal length f can be approximated by a straight line.

Further, as shown in FIG. 8, when the focal length f is made logarithmic, the first Tv value Tv _T1 and the third Tv value Tv _W1 at the same amount of blur Br _L are plotted as points near the same straight line. The second Tv value Tv _T2 and the fourth Tv value Tv _W2 at the same amount of shake Br _H are plotted as points near the same straight line.

In this way, when the focal length f is expressed logarithmically, the focal length f at different shutter speeds (Tv values) for the same amount of blur Br can be approximated by a straight line.

Therefore, the performance calculation unit 215 according to this modification calculates data related to the straight lines, such as the slope and intercept of these straight lines, to calculate the correction performance (assumed) at any shutter speed (Tv value) and any focal length f. The amount of blur Br) is calculated.

For example, the performance calculation unit 215 corrects the camera body 2 alone at a predetermined shutter speed and a predetermined focal length based on the correspondence between the correction performance of the camera body 2 at different focal lengths and the shutter speed (second correspondence). Calculate the performance (estimated amount of shake). Furthermore, the performance calculation unit 215 calculates correction for the interchangeable lens 3 alone at a predetermined shutter speed and a predetermined focal length based on the correspondence between the correction performance of the interchangeable lens 3 at different focal lengths and the shutter speed (first correspondence). Calculate the performance (estimated amount of shake).

More specifically, for example, the performance calculation unit 215 calculates the amount of change in performance due to shutter speed (first performance change) from the correction performance (estimated amount of shake) of the interchangeable lens 3 at a plurality of shutter speeds acquired by the acquisition unit 211A amount).

In this modification, for example, the performance calculation unit 215 calculates the relationship (linear approximation) between the shutter speed and the correction performance at the T end from the correction performance at the first shutter speed and the correction performance at the second shutter speed.

For example, the performance calculation unit 215 calculates the relationship (linear approximation) between the shutter speed and the correction performance at the W end from the correction performance at the first shutter speed and the correction performance at the second shutter speed.

Next, the performance calculation unit 215 calculates the amount of change in correction performance (second amount of performance change) in the focal length during still image shooting. For example, the performance calculation unit 215 calculates the relationship between the shutter speed and the correction performance at the focal length during still image shooting based on the relationship between the shutter speed and the correction performance at the T end and the relationship between the shutter speed and the correction performance at the W end. Estimate the relationship.

Next, the photographer presses the shutter button (release button 11, see FIG. 3) to determine the shutter speed. The performance calculation unit 215 acquires information regarding the shutter speed via the acquisition unit 211A. The performance calculation unit 215 calculates the correction performance of the interchangeable lens 3 at the shutter speed during still image shooting from the relationship between the shutter speed and the correction performance at the focal length during still image shooting.

Similarly, the performance calculation unit 215 calculates the correction performance at the shutter speed and focal length at the time of shooting from the correction performance (estimated amount of shake) of the camera body 2 at a plurality of shutter speeds acquired by the acquisition unit 211A.

More specifically, for example, the performance calculation unit 215 calculates the amount of change in performance due to shutter speed (first performance change) from the correction performance (estimated shake amount) of the camera body 2 at the plurality of shutter speeds acquired by the acquisition unit 211A. amount).

In this modification, for example, the performance calculation unit 215 calculates the relationship (linear approximation) between the shutter speed and the correction performance at the T end from the correction performance at the third shutter speed and the correction performance at the fourth shutter speed.

For example, the performance calculation unit 215 calculates the relationship (linear approximation) between the shutter speed and the correction performance at the W end from the correction performance at the third shutter speed and the correction performance at the fourth shutter speed.

Next, the photographer presses the shutter button (release button 11, see FIG. 3) to determine the shutter speed. The performance calculation unit 215 acquires information regarding the shutter speed via the acquisition unit 211A. The performance calculation unit 215 calculates the correction performance of the camera body 2 at the shutter speed during still image shooting from the relationship between the shutter speed and correction performance at the focal length during still image shooting.

The performance calculation unit 215 outputs the calculated corrected performance to the performance determination unit 212A.

(Performance judgment unit 212A)
Returning to FIG. 6, the performance determining unit 212A calculates the difference in correction performance between the camera body 2 and the interchangeable lens 3 at the time of photography calculated by the performance calculating unit 215. The performance determination unit 212A compares the calculated difference (performance difference) with a third threshold Th3. The performance determination unit 212A outputs the comparison result to the cooperation determination unit 214A.

(Cooperation determination unit 214A)
Based on the comparison result of the performance determining section 212A, the cooperation determining section 214A determines an independent operation or a cooperative operation of blur correction depending on the correction performance of the body-side image stabilization mechanism 7 and the lens-side image stabilization mechanism 40. If the cooperation determination unit 214A determines that there is a difference in the correction performance of the body-side vibration reduction mechanism 7 and the lens-side vibration reduction mechanism 40 based on the comparison result of the performance determination unit 212A, the cooperation determination unit 214A determines to operate the vibration correction independently. .

Specifically, the cooperation determination unit 214A determines to operate the blur correction independently when the difference in performance between the body-side blur correction mechanism 7 and the lens-side blur correction mechanism 40 is equal to or greater than the third threshold Th3.

If it is determined to operate independently, the cooperation determination unit 214A determines that blur correction is to be performed by the body-side blur correction mechanism 7 or the lens-side blur correction mechanism 40, whichever has higher correction performance.

Further, the cooperation determination unit 214A estimates the expected amount of blur based on the information regarding the shutter speed and the information regarding the focal length acquired by the acquisition unit 211A. The cooperation determination unit 214A determines whether or not to perform a cooperative operation of blur correction according to the estimated expected amount of blur. For example, the cooperation determination unit 214A determines whether or not to perform a cooperative operation of blur correction depending on whether the estimated amount of blur is less than a second threshold.

If the estimated amount of blur is less than the second threshold, the cooperation determination unit 214 determines to perform blur correction in an independent operation. On the other hand, the cooperation determination unit 214 determines that the blur correction should be performed in a cooperative manner when the estimated amount of blur is equal to or greater than the second threshold.

<4.2. Judgment processing example>
FIG. 9 is a flowchart illustrating an example of the flow of determination processing according to a modification of the embodiment of the present disclosure. The determination process in FIG. 9 is executed by the camera body 2, for example, before the blur correction process when photographing a still image. Note that the same processes as the determination process in FIG. 6 are given the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 9, the camera body 2 acquires the blur correction performance of the camera body 2 and the interchangeable lens 3 (step S201). Here, the camera body 2 acquires the correction performance at the T end and W single end of the camera body 2 for each different shutter speed. Further, the camera body 2 acquires the correction performance of the interchangeable lens 3 at the T end and W single for each different shutter speed.

Next, the camera body 2 calculates the first performance change amount of each of the camera body 2 and the interchangeable lens 3 (step S202).

For example, the camera body 2 calculates the amount of change in performance depending on the shutter speed at each of the T end and the W end as the first amount of change in performance from the correction performance of the interchangeable lens 3 at the plurality of shutter speeds obtained in step S201.

For example, the camera body 2 calculates the amount of change in performance due to the shutter speed at each of the T end and the W end from the correction performance (estimated amount of shake) of the camera body 2 at the plurality of shutter speeds acquired in step S201. Calculated as the amount of change in performance.

After that, when the focal length and the movable range are acquired (steps S108 and S109) and the correction ratio is calculated (step S110), the camera body 2 calculates the second performance change amount of each of the camera body 2 and the interchangeable lens 3. (Step S203).

For example, the camera body 2 calculates the amount of change in the correction performance of the camera body 2 and the interchangeable lens 3 at the focal length obtained in step S108 as the second amount of change in performance.

After that, the processing from step S111 to step S114 is the same as the determination processing shown in FIG. 6.

The camera body 2 that has determined that the expected amount of blur is less than the second threshold Th2 (step S114; Yes) calculates the performance difference between the camera body 2 and the interchangeable lens 3 (step S205).

For example, the camera body 2 uses the second performance change amount calculated in step S203 to calculate the correction performance of each of the camera body 2 and the interchangeable lens 3 at the shutter speed acquired in step S112. The camera body 2 calculates the calculated difference in correction performance between the camera body 2 and the interchangeable lens 3 as a performance difference.

The camera body 2 determines whether the calculated performance difference is greater than or equal to the third threshold Th3 (step S206).

If the performance difference is less than the third threshold Th3 (step S206; No), the camera body 2 proceeds to step S107 and determines blur correction by cooperative operation.

On the other hand, if the performance difference is greater than or equal to the third threshold Th3 (step S206; Yes), the camera body 2 determines to perform blur correction independently. The subsequent processing is the same as the determination processing in FIG.

Note that in FIG. 9, the first performance change amount is calculated in step S202 after the camera body 2 acquires the correction performance of the camera body 2 and the interchangeable lens 3 at a plurality of shutter speeds. Further, it is assumed that the second performance change amount is calculated in step S203 after the camera body 2 acquires the focal length. However, the timing for calculating the first performance change amount and/or the second performance change amount is not limited to the example shown in FIG. 9 .

For example, the camera body 2 may calculate the first performance change amount immediately before calculating the second performance change amount, or calculate the first and second performance change amount immediately before calculating the performance difference. You can do it like this.

In this way, the process in FIG. 9 may be changed or omitted as appropriate. For example, the order of the process of estimating the expected shake amount and comparing it with the second threshold Th2 and the process of calculating the performance difference and comparing it with the third threshold Th3 may be changed.

As described above, in this modification, the camera system 1 determines whether to perform shake correction alone or with emphasis, depending on the performance difference between the camera body 2 and the interchangeable lens 3 in terms of shutter speed and focal length at the time of shooting. Determine. Thereby, the camera system 1 can calculate the performance difference between the camera body 2 and the interchangeable lens 3 with higher accuracy.

Furthermore, in this modification, the camera system 1 calculates the correction performance of the camera body 2 and the interchangeable lens 3 according to the shutter speed and focal length at the time of shooting. Therefore, even if the movable range (correction range) of the camera body 2 and the interchangeable lens 3 with higher correction performance is sufficiently large relative to the expected amount of shake, the camera system 1 does not allow the camera body 2 or the interchangeable lens 3 to move. If the performance difference between 3 and 3 is small, cooperative operation can be selected.

In other words, even if the camera body 2 and the interchangeable lens 3 with higher correction performance can perform sufficient image stabilization alone, if the difference in performance between the camera body 2 and the interchangeable lens 3 is small, the camera system 1 can work together to compensate for the image blur. It may be decided to make a correction.

In this way, even if the camera body 2 and the interchangeable lens 3 with higher correction performance can perform sufficient image stabilization alone, the camera system 1 cooperates to perform image stabilization, so that the camera body 2 and the interchangeable lens 3 The amount of movement of each blur correction mechanism is distributed. That is, by performing a cooperative operation with the camera body 2 and the interchangeable lens 3, the amount of movement of the body-side shake correction mechanism 7 and the movement amount of the lens-side shake correction mechanism 40 are reduced. As a result, the actuators (not shown) of the shake correction mechanism of the camera body 2 and the interchangeable lens 3 can be driven at the speed of light with smaller power, and the accuracy of shake correction is further improved.

<<5. Other embodiments >>
The processes according to the embodiments and modifications described above may be implemented in various different forms in addition to the embodiments and modifications described above.

In the above-described embodiments and modifications, the camera body 2 performs the determination process, but the present invention is not limited to this. For example, the interchangeable lens 3 may perform at least part of the determination process. In this case, for example, the lens-side blur correction control unit 41 of the interchangeable lens 3 can execute at least part of the determination process. Further, in this case, the interchangeable lens 3 functions as an information processing device that executes information processing such as determination processing.

In addition, in the above-mentioned modified example, the camera body 2 acquires the correction performance of the camera body 2 and interchangeable lens 3 at the T end and the W end, but the correction performance acquired by the camera body 2 is not limited to the correction performance at the T end and the W end. The camera body 2 only needs to acquire the correction performance of the camera body 2 and interchangeable lens 3 at a plurality of different focal lengths, and may acquire correction performance at a focal length other than the T end and the W end. Furthermore, the camera body 2 may acquire the correction performance of the camera body 2 and interchangeable lens 3 at three or more different focal lengths.

Furthermore, in the above-mentioned modification, the camera body 2 acquires the correction performance of the camera body 2 and the interchangeable lens 3 at two different shutter speeds, but the shutter speeds at which the camera body 2 acquires the correction performance are divided into two. Not limited. For example, the camera body 2 may acquire the correction performance of the camera body 2 and the interchangeable lens 3 at three or more different shutter speeds.

Furthermore, in the embodiments and modifications described above, it is assumed that the camera body 2 determines whether the camera body 2 and the interchangeable lens 3 operate independently for image stabilization, or both operate together. The decision is not limited to this. For example, it may be determined that the camera body 2 performs a cooperative operation with a different correction ratio instead of an independent operation.

In this case, when the performance difference between the camera body 2 and the interchangeable lens 3 is greater than or equal to the first threshold Th1, and the expected amount of shake is smaller than the movable range of one of the camera body 2 and the interchangeable lens 3, It is determined that the cooperative operation will be performed using the second correction ratio.

Here, if the difference in performance between the camera body 2 and the interchangeable lens 3 is less than the first threshold Th1, or if the expected amount of shake is greater than the movable range of either the camera body 2 or the interchangeable lens 3, the camera body 2 Let the correction ratio of the cooperative motion to be determined be the first correction ratio.

The second correction ratio is determined, for example, such that the correction ratio of the camera body 2 and the interchangeable lens 3, which has higher correction performance, is larger than the first correction ratio.

In this manner, when the difference in the performance of camera shake correction between the camera body 2 and the interchangeable lens 3 is large, the camera body 2 may decide to perform more vibration correction on the one with higher performance.

For example, the control device that controls the camera body 2 of this embodiment may be realized by a dedicated computer system or a general-purpose computer system.

For example, a program for executing operations such as the above-mentioned determination process is stored and distributed in a computer-readable recording medium such as an optical disk, semiconductor memory, magnetic tape, or flexible disk. Then, for example, the program is installed on a computer and the control device is configured by executing the above-described processing. At this time, the control device may be a device external to the camera body 2 (for example, a personal computer). Further, the control device may be a device inside the camera body 2 (for example, the overall control section 101).

Furthermore, the above program may be stored in a disk device included in a server device on a network such as the Internet, so that it can be downloaded to a computer. Furthermore, the above-mentioned functions may be realized through collaboration between an OS (Operating System) and application software. In this case, the parts other than the OS may be stored on a medium and distributed, or the parts other than the OS may be stored in a server device so that they can be downloaded to a computer.

Further, among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or the processes described as being performed manually can be performed manually. All or part of this can also be performed automatically using known methods. In addition, the processing procedures, specific names, and information including various data and parameters shown in the above documents and drawings may be changed arbitrarily, unless otherwise specified. For example, the various information shown in each figure is not limited to the illustrated information.

Furthermore, each component of each device shown in the drawings is functionally conceptual, and does not necessarily need to be physically configured as shown in the drawings. In other words, the specific form of distributing and integrating each device is not limited to what is shown in the diagram, and all or part of the devices can be functionally or physically distributed or integrated in arbitrary units depending on various loads and usage conditions. Can be integrated and configured. Note that this distribution/integration configuration may be performed dynamically.

Furthermore, the above-described embodiments can be combined as appropriate in areas where the processing contents do not conflict. Furthermore, the order of the steps shown in the flowcharts and the like of the above-described embodiments can be changed as appropriate.

Furthermore, for example, the present embodiment can be applied to any configuration constituting a device or system, such as a processor as a system LSI (Large Scale Integration), a module using multiple processors, a unit using multiple modules, etc. Furthermore, it can also be implemented as a set (that is, a partial configuration of the device) with additional functions.

Note that in this embodiment, a system means a collection of multiple components (devices, modules (components), etc.), and it does not matter whether all the components are in the same housing or not. Therefore, multiple devices housed in separate casings and connected via a network, and a single device with multiple modules housed in one casing are both systems. .

<<6. Conclusion >>
Although the embodiments of the present disclosure have been described above, the technical scope of the present disclosure is not limited to the above-mentioned embodiments as they are, and various changes can be made without departing from the gist of the present disclosure. . Furthermore, components of different embodiments and modifications may be combined as appropriate.

Further, the effects in each embodiment described in this specification are merely examples and are not limited, and other effects may also be provided.

Note that the present technology can also have the following configuration.
(1)
An imaging device comprising a camera body equipped with a first image stabilization function and an interchangeable lens equipped with a second image stabilization function,
The imaging device includes:
obtaining lens performance information regarding the performance of the second image stabilization function of the interchangeable lens;
obtaining camera performance information regarding the performance of the first image stabilization function of the camera body;
Based on the lens performance information and the camera performance information, it is determined whether to perform blur correction on one of the interchangeable lens and the camera body, or to cause the blur correction on the interchangeable lens and the camera body to operate cooperatively. control unit,
An imaging device comprising:
(2)
When the performance difference between the second image stabilization function of the interchangeable lens and the first image stabilization function of the camera body is less than a threshold, the control unit controls the second image stabilization function of the interchangeable lens and the camera body. The imaging device according to (1), which determines to perform blur correction in a coordinated manner.
(3)
The control unit performs the blur correction on one of the interchangeable lens and the camera body, or causes the blur correction on the interchangeable lens and the camera body to operate cooperatively, depending on the shutter speed and focal length at the time of photography. The imaging device according to (1) or (2), which determines .
(4)
The control unit includes:
Estimating the expected amount of shake of the imaging device according to the shutter speed and focal length at the time of shooting,
Based on the movable range of the second image stabilization function of the interchangeable lens and the first image stabilization function of the camera body, and the estimated amount of shake, perform the image stabilization on one of the interchangeable lens and the camera body. The imaging device according to any one of (1) to (3), wherein the image pickup device determines whether to perform the shake correction of the interchangeable lens and the camera body in a coordinated manner.
(5)
The control unit is configured such that the movable range due to the second blur correction function of the interchangeable lens is larger than the assumed shake amount, or the movable range due to the first shake correction function of the camera body is larger than the assumed shake amount. The imaging device according to (4), in which it is determined that the blur correction of the interchangeable lens and the camera body are operated in a coordinated manner when the image stabilization is larger than that of the camera body.
(6)
The control unit includes:
acquiring the lens performance information at different focal lengths at different shutter speeds,
acquiring the camera performance information at different focal lengths at different shutter speeds;
Based on the acquired lens performance information, estimate the blur correction performance of the interchangeable lens at the focal length and shutter speed at the time of shooting,
Based on the acquired camera performance information, estimate the blur correction performance of the camera body at the time of the photograph at the focal length and the shutter speed at the time of the photograph;
Depending on the image stabilization performance of the interchangeable lens and the camera body at the time of shooting, the image stabilization may be performed on one of the interchangeable lens and the camera body, or the image stabilization of the interchangeable lens and the camera body may be performed cooperatively. The imaging device according to any one of (1) to (5), which determines whether to operate the imaging device.
(7)
The control unit includes:
(6) estimating the blur correction performance of the interchangeable lens at the time of photographing, based on at least one of changes in the lens performance information at different focal lengths and changes in the lens performance information at different shutter speeds; The imaging device described in .
(8)
The control unit includes:
(6) estimating the blur correction performance of the camera body at the time of shooting based on at least one of changes in the camera performance information at different focal lengths and changes in the camera performance information at different shutter speeds; Or the imaging device according to (7).
(9)
If the control unit determines to perform the blur correction on one of the interchangeable lens and the camera body, it determines to perform the blur correction on the one with higher blur correction performance. The imaging device according to item 1.
(10)
The control unit instructs one of the interchangeable lens and the camera body, which has been determined to perform the image stabilization, to perform the image stabilization, in any one of (1) to (8). The imaging device described.
(11)
The imaging device according to any one of (1) to (9), wherein the control unit determines a ratio at which the shake correction is performed for the interchangeable lens and the camera body according to shake correction performance.
(12)
The imaging device according to (11), wherein the control unit instructs the interchangeable lens and the camera body to perform the blur correction at the ratio.
(13)
Obtaining lens performance information regarding the performance of the second image stabilization function of the interchangeable lens,
Obtain camera performance information regarding the performance of the first image stabilization function of the camera body,
Based on the lens performance information and the camera performance information, it is determined whether to perform blur correction on one of the interchangeable lens and the camera body, or to cause the blur correction on the interchangeable lens and the camera body to operate cooperatively. control unit,
An information processing device comprising:
(14)
Obtaining lens performance information regarding the performance of a second image stabilization function of the interchangeable lens;
Obtaining camera performance information regarding the performance of a first image stabilization function of the camera body;
Based on the lens performance information and the camera performance information, it is determined whether to perform blur correction on one of the interchangeable lens and the camera body, or to cause the blur correction on the interchangeable lens and the camera body to operate cooperatively. to do and
A program that causes a processor to execute.

1 Camera system 2 Camera body 3 Interchangeable lens 7, 40

Shake correction mechanism

8, 38 Control device 21, 41 Shake correction control section 37 Lens group 39 Lens position detection section 101 Overall control section

Claims

An imaging device comprising a camera body equipped with a first image stabilization function and an interchangeable lens equipped with a second image stabilization function,
The imaging device includes:
obtaining lens performance information regarding the performance of the second image stabilization function of the interchangeable lens;
obtaining camera performance information regarding the performance of the first image stabilization function of the camera body;
Based on the lens performance information and the camera performance information, it is determined whether to perform blur correction on one of the interchangeable lens and the camera body, or to cause the blur correction on the interchangeable lens and the camera body to operate cooperatively. control unit,
An imaging device comprising:
When the performance difference between the second image stabilization function of the interchangeable lens and the first image stabilization function of the camera body is less than a threshold, the control unit controls the second image stabilization function of the interchangeable lens and the camera body. The imaging device according to claim 1, wherein the imaging device determines to perform blur correction in a coordinated manner.
The control unit performs the blur correction on one of the interchangeable lens and the camera body, or causes the blur correction on the interchangeable lens and the camera body to operate cooperatively, depending on the shutter speed and focal length at the time of photography. The imaging device according to claim 1, wherein the imaging device determines .
The control unit includes:
Estimating the expected amount of shake of the imaging device according to the shutter speed and focal length at the time of shooting,
Based on the movable range of the second image stabilization function of the interchangeable lens and the first image stabilization function of the camera body, and the estimated amount of shake, perform the image stabilization on one of the interchangeable lens and the camera body. The imaging device according to claim 1 , wherein the image capturing apparatus determines whether to perform the blur correction of the interchangeable lens and the camera body in a coordinated manner.
The control unit is configured such that the movable range due to the second blur correction function of the interchangeable lens is larger than the assumed shake amount, or the movable range due to the first shake correction function of the camera body is larger than the assumed shake amount. The imaging device according to claim 4, wherein if the image stabilization is larger than that, it is determined that the shake correction of the interchangeable lens and the camera body are operated in a coordinated manner.
The control unit includes:
Based on a first correspondence between the lens performance information and shutter speed at different focal lengths, estimate the blur correction performance of the interchangeable lens at the focal length and the shutter speed at the time of photography,
Based on a second correspondence relationship between the camera performance information and the shutter speed at different focal lengths, estimate the shake correction performance of the camera body at the focal length and the shutter speed at the time of shooting. ,
Depending on the image stabilization performance of the interchangeable lens and the camera body at the time of shooting, the image stabilization may be performed on one of the interchangeable lens and the camera body, or the image stabilization of the interchangeable lens and the camera body may be performed cooperatively. The imaging device according to claim 1, wherein the imaging device determines whether to operate the imaging device.
The control unit includes:
6. The blur correction performance of the interchangeable lens at the time of photographing is estimated based on at least one of a change in the lens performance information at different focal lengths and a change in the lens performance information at different shutter speeds. The imaging device described in .
The control unit includes:
6. The image stabilization performance of the camera body at the time of photographing is estimated based on at least one of a change in the camera performance information at different focal lengths and a change in the camera performance information at different shutter speeds. The imaging device described in .
The imaging device according to claim 1, wherein when the control unit determines to perform the blur correction on one of the interchangeable lens and the camera body, it determines to perform the blur correction on the one with higher blur correction performance.
The imaging device according to claim 1, wherein the control unit instructs one of the interchangeable lens and the camera body that has been determined to perform the blur correction to perform the blur correction.
The imaging device according to claim 1, wherein the control unit determines a ratio of the shake correction of the interchangeable lens and the camera body according to shake correction performance.
The imaging device according to claim 11, wherein the control unit instructs the interchangeable lens and the camera body to perform the blur correction at the ratio.
Obtaining lens performance information regarding the performance of the second image stabilization function of the interchangeable lens,
Obtain camera performance information regarding the performance of the first image stabilization function of the camera body,
Based on the lens performance information and the camera performance information, it is determined whether to perform blur correction on one of the interchangeable lens and the camera body, or to cause the blur correction on the interchangeable lens and the camera body to operate cooperatively. control unit,
An information processing device comprising:
Obtaining lens performance information regarding the performance of a second image stabilization function of the interchangeable lens;
Obtaining camera performance information regarding the performance of a first image stabilization function of the camera body;
Based on the lens performance information and the camera performance information, it is determined whether to perform blur correction on one of the interchangeable lens and the camera body, or to cause the blur correction on the interchangeable lens and the camera body to operate cooperatively. to do and
A program that causes a processor to execute.