Image stabilizer control device, imaging device, lens device

Abstract

To provide a shake correction control device capable of reducing the influence of a camera shake, even under the condition that the influence of the small camera shake appears on a photographed image.SOLUTION: The shake correction control device includes acquisition means for acquiring the resolution of an imaging system on the basis of information indicating the resolution of a photographing optical system possessed by a lens device and information indicating the resolution of an imaging element for capturing a subject image formed by the lens device, control means for controlling correction means for correcting the influence on the photographed image due to a shake, and setting means for setting the responsiveness of the correction means controlled by the control means on the basis of the resolution of the imaging system. The setting means sets the responsiveness when the resolution of the imaging system is a first value higher than that when the resolution of the imaging system is a second value lower than the first value to the correction means.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a blur correction control device for an image pickup system having a blur correction means for use during photography. [Background technology]

[0002] In recent years, as imaging devices have become more sophisticated, many imaging devices and photographing lenses are equipped with a shake correction mechanism. The shake correction mechanism allows a user to reduce the effect of camera shake on a photographed image when holding the imaging device in his / her hand. Several types of shake correction mechanisms have been proposed for use in imaging devices. For example, a method of performing shake correction by driving (displacing) a part of a lens in the photographing optical system and a method of performing shake correction by driving (displacing) an image sensor in the camera body are known. In an image sensor with interchangeable lenses, the former is a method of performing shake correction by driving a part of a lens in the photographing optical system in an interchangeable lens device, and the latter is a method of performing shake correction by driving an image sensor in the camera body. A method of performing shake correction by combining the two and driving both a part of a lens in the photographing optical system and the image sensor is also known.

[0003] Patent Document 1 discloses a technique for selecting a method of performing blur correction by driving either a part of a lens in a photographing optical system, an image sensor, or both, depending on the resolution of the photographing lens.

[0004] Generally, it is said that the effects of camera shake are most noticeable in photographed images when the image is taken at a shutter speed slower than 1 / focal length. For example, when using a photographic optical system with a focal length of 80 mm, the effects of camera shake are said to be evident in photographed images when the image is taken at a shutter speed slower than 1 / 80 sec. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2006-113468 Summary of the Invention [Problem to be solved by the invention]

[0006] Due to the improvement of the performance of imaging devices, the number of pixels of imaging elements and the resolution of photographing lenses are increasing. In addition, in recent years, there are more and more opportunities to view photographs on the screens of PCs, smartphones, etc. As a result, there is a problem that even if the amount of blur on the image sensor surface is small, it may be observed as camera shake when viewing an image captured using a high-resolution imaging device or lens device by enlarging it on the screen of a smartphone or the like.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a blur correction control device that can reduce the effects of camera shake even under conditions in which the effects of small camera shake appear in the captured image. [Means for solving the problem]

[0008] A blur correction control device as one aspect of the present invention includes an acquisition means for acquiring a resolution of an imaging system based on information indicating the resolving power of an imaging optical system of a lens device and information indicating the resolving power of an imaging element that captures a subject image formed by the lens device, a control unit for controlling a correction means that corrects the effect on a captured image of a blur applied to an imaging device to which the lens device is attached, and a setting means for setting a responsiveness of the correction means controlled by the control unit based on the resolution of the imaging system, wherein when the resolution of the imaging system is a first value, the setting means sets a higher responsiveness of the correction means than when the resolution of the imaging system is a second value lower than the first value. Other aspects of the present invention will be made clear in the embodiments described below. Effect of the Invention

[0009] To reduce the influence of camera shake even under conditions where the influence of a small camera shake appears in a photographed image. [Brief description of the drawings]

[0010] [Figure 1] A central cross-sectional view and a block diagram of an imaging system 100 according to a first embodiment. [Diagram 2] Block diagram of a shake correction system in the first embodiment [Diagram 3] A diagram explaining the resolution of an imaging system. [Figure 4] FIG. 4 is a diagram for explaining a change in the responsiveness of the shake correction unit in the first embodiment. [Diagram 5] Control flow chart in the first embodiment [Figure 6] Control flow chart in the first embodiment [Figure 7] FIG. 2 is a block diagram of a blur correction system according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a diagram for explaining a change in control of the shake correction unit in the second embodiment of the present invention. [Figure 9] Control flow chart in the second embodiment of the present invention [Figure 10] FIG. 13 is a diagram for explaining a change in control of the shake correction unit in the third embodiment of the present invention. [Figure 11] FIG. 13 is a diagram for explaining a change in control of the shake correction unit in the fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims. Although the following embodiments describe a number of features, not all of these features are essential to the invention, and the features may be combined in any manner. Furthermore, in the accompanying drawings, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted. EXAMPLES

[0012] An imaging system according to a first embodiment of the present invention will be described below with reference to Fig. 1 to Fig. 5. Fig. 1 is a schematic diagram for explaining the configuration of an imaging system 100 according to this embodiment. Fig. 1(a) is a central cross-sectional view of the imaging system 100, and Fig. 1(b) is a block diagram showing the electrical configuration of the imaging system 100.

[0013] 1(a), an imaging system 100 of this embodiment includes a camera body (imaging device) 1 and a lens device 2 that can be attached to the camera body 1. The imaging system 100 is a so-called interchangeable lens single-lens camera, and is configured so that various interchangeable lenses can be attached and detached via a circular mount block. The mount block has electrical contacts 11, and the lens device 2 is attached to the camera body 1 via the mount block, thereby connecting the lens device 2 and the camera body 1 so as to be able to communicate with each other.

[0014] As shown in Fig. 1, the lens device 2 includes a photographing optical system 3 consisting of a plurality of lenses, a lens system control unit 12 that controls the operation of the entire lens device, a lens side shake correction unit 13 that performs camera shake correction, and a lens side shake detection unit 16 that detects the amount of shake. The photographing optical system 3 has a shake correction lens 3a that is an optical element that performs camera shake correction, and the lens side shake correction unit 13 has a support unit and an actuator that support the shake correction lens 3a. Based on the detection result by the lens side shake detection unit 16, the lens side shake correction unit 13 drives the shake correction lens 3a on a plane perpendicular to the optical axis 4 of the photographing optical system, thereby performing a camera shake correction operation that reduces the influence of camera shake on a captured image. In addition to driving the shake correction lens 3a, the lens system control unit 12 can also drive a focus lens and an aperture (not shown) using a drive unit (not shown).

[0015] The camera body 1 includes a camera system control unit 5 that controls the entire camera, an image sensor 6 that captures a subject image formed by the photographing optical system, and an image processing unit 7 that performs development processing, gamma processing, and the like on the electrical signal acquired by the image sensor. The electrical signal converted into an image format by the image processing unit 7 is stored in a memory unit 8 by the camera system control unit 5. The camera body further includes a display unit 9, a shutter 17 provided in front of the image sensor 6, and an operation detection unit 10 that detects signals from an operation unit including a shutter release button (not shown). The display unit 9 includes a rear display device 9a provided on the rear of the camera body 1, and an EVF (electronic viewfinder) 9b provided in the finder of the camera body 1. The camera body 1 further includes a camera side shake detection unit 15, and a camera side shake correction unit 14 that corrects image shake by moving the image sensor 6 in a plane perpendicular to the optical axis 4 based on the shake detection result. Camera-side shake correction unit 14 has a support unit that supports image sensor 6 and an actuator, and performs camera-side shake correction by driving the actuator under the control of camera system control unit 5 to move the image sensor in a plane perpendicular to the optical axis.

[0016] Camera system control unit 5 and lens system control unit 12 cooperate by communicating via electrical contacts 11, and use camera side shake correction unit 14 and lens side shake correction unit 13, respectively, to perform drive control for reducing vibrations applied to imaging system 100. Note that in this embodiment, an example will be described in which camera system control unit 5 sends instructions to lens system control unit 12 to control lens side shake correction unit 13, thereby controlling shake correction of the entire imaging system 100. Lens system control unit 12 may send instructions to camera system control unit 5 to control shake correction of the entire imaging system 100, or the imaging system may be configured to have only either lens side shake correction unit 13 or camera side shake correction unit 14.

[0017] The imaging system 100 equipped with the camera body 1 and the lens device 2 constitutes an imaging means, an image processing means, a recording / playback means, and a control means, as described above.

[0018] The imaging means includes a photographing optical system 3 and an image sensor 6, and the image processing means includes an image processing unit 7. The recording / playback means includes a memory unit 8 and a display unit 9 (display unit 9 includes a rear display device 9a and an EVF 9b). Similarly, the control means includes a camera system control unit 5, an operation detection unit 10, a camera side shake detection unit 15, a camera side shake correction unit 14, a lens system control unit 12, a lens side shake detection unit 16, and a lens side shake correction unit 13.

[0019] Camera side shake detection unit 15 and lens side shake detection unit 16 are capable of detecting rotational shake (shake in the pitch direction and shake in the yaw direction) applied to imaging system 100 relative to optical axis 4, and this is achieved by using, for example, a vibration gyro. Based on the amount of rotational shake detected by camera side shake detection unit 15 and lens side shake detection unit 16, camera side shake correction unit 14 drives imaging element 6, and lens side shake correction unit 13a drives shake correction lens 3a, both on a plane perpendicular to optical axis 4.

[0020] Furthermore, camera-side shake detection unit 15 is provided with, for example, an acceleration sensor, and is capable of detecting translational shake applied to the imaging device. Therefore, camera-side shake correction unit 14 drives imaging element 6 in a plane perpendicular to optical axis 4, based on the rotational shake and translational shake detected by camera-side shake detection unit 15.

[0021] The imaging means described above is an optical processing system that forms an image of light from an object on the imaging surface of the imaging element 6 via the photographing optical system 3. Since the image sensor 6 provides a focus evaluation amount / appropriate exposure amount, the photographing optical system 3 is appropriately adjusted based on these signals (AF signal / AE signal), so that an appropriate amount of object light is exposed to the image sensor, and a subject image is formed near the image sensor.

[0022] The image processing unit 7 has an internal A / D converter, a white balance adjustment circuit, a gamma correction circuit, an interpolation calculation circuit, etc., and can generate images for recording. The image processing unit 7 is provided with a color interpolation processing means, which performs color interpolation (demosaicing) processing on the Bayer array signal to generate a color image. The image processing unit 7 also compresses images, videos, audio, etc. using a predetermined method.

[0023] The memory unit 8 includes non-volatile and volatile memories. The image captured by the imaging element 6 is output to the memory unit 8 by the camera system control unit 5, and the image to be presented to the user is displayed on the display unit 9.

[0024] The camera system control unit 5 controls the imaging system, image processing system, and recording / playback system in response to an external operation. For example, when the operation detection unit 10 detects the pressing of a shutter release button (not shown), the camera system control unit 5 generates a timing signal and outputs it to the shutter 17, the image sensor 6, and the image processing unit 7, thereby controlling the drive of the image sensor 6, the operation of the image processing unit 7, compression processing, etc. Furthermore, the camera system control unit 5 controls the state of each segment of the information display device that displays information using the display unit 9. In addition, the rear display unit 9a is a touch panel, and may serve as both the display unit 9 and the operation unit.

[0025] The adjustment operation of the photographing optical system by the control means will be described. The image processing section 7 is connected to the camera system control section 5, and determines the appropriate focus position and aperture position based on the signal from the image sensor 6. The camera system control section 5 issues a command to the lens system control section 12 via the electrical contact 11, and the lens system control section 12 appropriately controls the focus lens driving means and the aperture driving means (not shown). Furthermore, in a mode in which blur correction is performed, the camera system control section 5 controls the camera side blur correction section 14 based on the signal (blur detection result) obtained from the camera side blur detection section 15. Similarly, the lens system control section 12 controls the lens blur correction section 13 based on the signal obtained from the lens side blur detection section 16.

[0026] The basic control operation of the shake correction section is that first, camera system control section 5 and lens system control section 12 detect the hand shake signals (rotational shake and translational shake) detected by camera side shake detection section 15 and lens side shake detection section 16, respectively. Based on the results, camera system control section 5 and lens system control section 12 calculate the drive amounts of image sensor 6 and shake correction lens 3a, respectively, to correct the shake. Camera system control section 5 and lens system control section 12 then output the calculated drive amounts as command values ​​to camera side shake correction section 14 and lens side shake correction section 13. Camera side shake correction section 14 drives image sensor 6, and lens side shake correction section 13 drives shake correction lens 3a according to the input drive amounts.

[0027] In this embodiment, in addition to the above control, the control of each blur correction unit by the camera system control unit 5 and the lens system control unit 12 is changed according to shooting conditions such as the resolution of the shooting optical system 3, the resolution of the image sensor 6, and further the shutter speed. The detailed control method will be described later.

[0028] As described above, the camera system control unit 5 and the lens system control unit 12 control the operations of the various units of the camera body 1 and the lens device 2 in response to user operations on operation means (not shown) provided on the camera body 1 and the lens device 2. This makes it possible to capture still images and videos.

[0029] <About image stabilization system control> Next, the configurations of the camera side shake correction system and the lens side shake correction system in this embodiment will be described with reference to Fig. 2. Fig. 2 shows a control block diagram of the camera side shake correction system provided in the camera body 1 and the lens side shake correction system provided in the lens device 2. Fig. 2(a) shows the control block diagram of the camera side shake correction system, and Fig. 2(b) shows the control block diagram of the lens side shake correction system.

[0030] As shown in FIG. 2(a), in this embodiment, the camera side shake correction system is composed of camera side shake detection unit 15, camera system control unit 5, camera side shake correction unit 14, and image sensor 6. Camera system control unit 5 also has camera side target value generation unit 5b that generates a drive target value to be output to camera side shake correction unit 14 based on the detection result of camera side shake detection unit 15. Camera system control unit 5 further has shutter speed memory unit 5e that stores a set shutter speed, and resolution. Camera system control unit 5 further has lens resolution memory unit 5f that stores information indicating the resolution (called lens resolution) of photographing optical system 3, and image sensor resolution memory unit 5g that stores information indicating the resolution of image sensor 6. Camera side target value generation unit 5b generates a drive target value based on the information from these memories (5e to 5g) in addition to the shake detection result.

[0031] The configuration of camera side target value generator 5b will be described in detail. Camera side target value generator 5b has camera side filter processor 5a that performs filter processing on the output of camera side shake detector 15, camera side gain compensator 5c that can change gain characteristics, and camera side phase compensator 5d that can change phase characteristics. Camera side filter processor 5a is specifically composed of a high-pass filter and a gain compensator based on the characteristics of camera side shake detector 15.

[0032] The shutter speed storage unit 5e stores the shutter speed obtained from the result of the photometry means (not shown) or the shutter speed input by the user. The lens resolution storage unit 5f stores data indicating the lens resolution obtained by the communication between the camera system control unit 5 and the lens system control unit 12 when the lens device 2 is attached. When the lens device 2 is replaced, the lens resolution storage unit 5f obtains information indicating the lens resolution from the newly attached lens device 2 and updates the information. The data may be updated every time the focal position (focus) of the lens device 2 is changed, or when the lens device 2 is a zoom lens, the data may be updated every time the focal length is changed. The image sensor resolution storage unit 5g stores information on the resolution of the image sensor 6 provided in the camera body 1. The lens resolution and the image sensor resolution will be described in detail later with reference to FIG. 3. As shown in FIG. 2(a), the camera system control unit 5 performs filtering and calculates a drive target value based on the information on the camera shake input from the camera side shake detection unit 15, and then drives the image sensor 6 to perform shake correction using the camera side shake correction unit 14. Furthermore, in this embodiment, camera-side target value generation unit 5b changes at least one of the gain characteristic and the phase characteristic according to the shooting conditions and the resolution of the imaging system acquired from shutter speed storage unit 5e, lens resolution storage unit 5f, and image sensor resolution storage unit 5g. As a result, camera-side target value generation unit 5b changes the responsiveness of the shake correction performed by camera-side shake correction unit 14.

[0033] As shown in FIG. 2(b), in this embodiment, the lens side blur correction system is composed of lens side blur detection unit 16, lens system control unit 12, lens side blur correction unit 13, and blur correction lens 3a. Lens system control unit 12 also has lens side target value generation unit 12b that generates a drive target value to be output to lens side blur correction unit 13 based on the detection result of lens side blur detection unit 16. Lens system control unit 12 further has lens resolution memory unit 12f that stores information indicating the resolving power of photographing optical system 3, and image sensor resolution memory unit 12g that stores information indicating the resolving power of image sensor 6. Lens side target value generation unit 12b generates a drive target value based on the shake detection result, as well as information from these memories (12f, g) and information indicating the shutter speed obtained from the camera body side.

[0034] The configuration of the lens side target value generating unit 12b will be described in detail. The lens side target value generating unit 12b has a lens side filter processing unit 12a that performs a filter process on the output of the lens side shake detecting unit 16, a lens side gain compensator 12c that can change the gain characteristics, and a lens side phase compensator 12d that can change the phase characteristics. Specifically, the lens side filter processing unit 12a is composed of a high pass filter and a gain compensator based on the characteristics of the lens side shake detecting unit 16.

[0035] When the camera body 1 is attached, the image sensor resolution storage unit 12g stores data indicating the resolution of the image sensor obtained through communication between the camera system control unit 5 and the lens system control unit 12. When the camera body 1 is replaced, information indicating the resolution of the image sensor is obtained from the newly attached camera body 1, and the information is updated.

[0036] The lens resolution storage unit 12f stores information indicating the resolution of the photographing optical system 3. The lens resolution storage unit 12f may update data every time the focal position (focus) of the lens device 2 is changed, or, if the lens device 2 is a zoom lens, may update data every time the focal length is changed. Details of the lens resolution and the image sensor resolution will be described later with reference to FIG. 3.

[0037] 2(b), lens system control unit 12 also performs filter processing and calculates a drive target value based on the hand shake information input from lens shake detection unit 16, and then drives shake correction lens 3a using camera side shake correction unit 14 to perform shake correction. Furthermore, in this embodiment, lens side target value generation unit 12b changes at least one of the gain characteristic and the phase characteristic according to the shooting conditions and the resolution of the imaging system obtained from shutter speed storage unit 5e, lens resolution storage unit 12f, and image sensor resolution storage unit 12g. As a result, lens side target value generation unit 12b changes the responsiveness of the shake correction performed by lens side shake correction unit 13.

[0038] The effect of changing the responsiveness of the blur correction according to the shooting conditions and the resolution of the imaging system will be explained below. Conventionally, when performing image stabilization, the basic control block is to perform appropriate filtering on the output of the blur detection unit, generate a target value for the blur correction unit in a target value generation unit tuned to certain parameters, and then perform drive control. In other words, the parameters of the phase compensator (5d, 12d) and gain compensator (5c, 12c) in Figure 2 are fixed.

[0039] On the other hand, with the recent high performance of imaging systems, lens devices 2 with improved resolution of the photographing optical system 3 and camera bodies 1 with higher resolution of the imaging element 6 are becoming more common. In addition, as an environment for viewing photographs, opportunities to view photographs on screens such as PC monitors and smartphone monitors are increasing, and accordingly, opportunities to view magnified images such as at pixel-to-pixel magnification are also increasing. Therefore, depending on the resolution of the imaging system, minute shakes that were previously unobservable and unnoticeable are becoming observable. In addition, such minute shakes contain many shakes with relatively high frequencies as camera shake, and tend to be more easily observed in images with fast shutter speeds (shorter exposure times) than in images with slower shutter speeds (longer exposure times).

[0040] Conventional basic image stabilization drive control is controlled according to certain parameters, regardless of shooting conditions such as the resolution of the imaging device, shutter speed, etc. Therefore, depending on the attached lens device, camera body, and shooting conditions set, minute blurring may remain and be visible when viewing the image in a magnified view.

[0041] Therefore, in this embodiment, when the resolution of the imaging system (photographic optical system 3 or imaging element 6) is high, the parameters of the target value generating unit (5b, 12b) are changed so that the response of the blur correction unit is high so that the blur correction unit can respond to more minute camera shake (high-frequency camera shake). Furthermore, the faster the shutter speed, the smaller and faster the blur that occurs during exposure is, so that large blur is less likely to occur and minute blur is more likely to be observed. Therefore, when the shutter speed is high, the parameters of the target value generating unit (5b, 12b) are changed so that the response of the blur correction unit is high. As it is generally said that camera shake begins to become noticeable when the shutter speed is slower than about 1 / f [sec] for the focal length f [mm], the ease of camera shake varies depending on both the focal length and the shutter speed. Therefore, in this embodiment, the response of the blur correction unit is changed according to not only the resolution of the imaging device (camera body 1 and lens device 2) but also the shutter speed, making it possible to perform blur correction suitable for minute camera shake.

[0042] In addition, increasing the responsiveness refers to improving the responsiveness in a high frequency band. Although it depends on the shooting conditions, specifically, it is preferable to improve the responsiveness in a band including at least a part of frequencies of 10 Hz or more. For example, by improving the responsiveness in a band including f Hz defined by the focal length f, even when shooting with an imaging system with high resolution, it is possible to improve the correction ability for blurring around f Hz, which is not noticeable in a system with low resolution.

[0043] A possible solution would be to set parameters in advance so that the responsiveness is always high, but in that case, there are concerns that the power consumption is likely to increase because the shake correction unit is always driven with good responsiveness, and that the driving noise is likely to be heard when the exposure time is long. In addition, even if the shake correction unit is moved finely beyond the resolution of the imaging device, it is possible that no difference will be seen in the captured image. In this embodiment, by changing the responsiveness of the shake correction unit according to the resolution and shutter speed of the imaging system, it is possible to effectively perform camera shake correction regardless of the system using a high-resolution lens or imaging element, or differences in shooting conditions such as shutter speed.

[0044] In addition to the above, the camera system control unit 5 and the lens system control unit 12 may change the responsiveness of the shake correction unit depending on the shutter mode. If there is a component that generates an impact inside the imaging device, such as the shutter 17 (mechanical shutter) shown in FIG. 1, an impact generated inside the imaging device other than hand shake (camera movement) may be input to the shake detection unit. Therefore, if the responsiveness of the shake correction unit is increased, it may happen that the shake correction unit is driven accordingly. Therefore, it is preferable to change the responsiveness described above in a so-called electronic shutter mode in which the mechanism of the shutter 17 is not driven, or in an electronic front curtain shutter mode in which vibration caused by the drive of the shutter 17 is not input to the shake detection unit during exposure of the image sensor 6.

[0045] Also, the responsiveness of the shake correction unit may be changed only during the exposure period of the image sensor 6. When the responsiveness of the shake correction unit is increased, it generally becomes responsive to disturbances. In other words, it drives with good responsiveness to disturbances input to the shake detection unit. Therefore, when an impact unintended by the user is input to the imaging system during framing or during a shooting preparation operation when the image sensor 6 is not exposed, the shake correction unit may drive in response to the impact. If the drive amount of the shake correction unit before exposure is large, it may happen that the stroke for shake correction during exposure is insufficient. Therefore, in this embodiment, it is preferable to change the drive control parameters of the shake correction unit only during the exposure of the image sensor 6. Also, as described above, there is a possibility that power consumption increases by increasing the responsiveness of the shake correction unit, so from the viewpoint of power consumption, it is considered preferable to change the responsiveness only during the exposure of the image sensor 6. In addition, in the present invention, unless otherwise specified, during exposure refers to the period during which exposure is performed to capture an image for recording (a still image or one frame of a video), and does not refer to the period during which exposure is performed to capture a live view image.

[0046] <About resolution> Next, the resolution to be referred to when changing the responsiveness of the image stabilization unit in this embodiment will be described with reference to Fig. 3. Fig. 3 is a diagram for explaining the resolution of the image sensor 6 and the photographic optical system 3, with Fig. 3(a) showing an image sensor with a certain resolution, and Fig. 3(b) showing an image sensor with a higher resolution than that of Fig. 3(a). Fig. 3(c) is a graph for explaining two photographic optical systems with different resolutions.

[0047] FIG. 3(a) shows an image sensor 31 and its enlarged view. The image sensor 31 has a plurality of pixels 32, which are arranged at a pitch 33. FIG. 3(b) shows an image sensor 34 having a higher resolution than the image sensor 31 of FIG. 3(a) and its enlarged view. The image sensor 34 has a plurality of pixels 35, which are arranged at a pitch 36. As shown in FIGS. 3(a) and 3(b), the pixel pitch 36 of the image sensor 34 is smaller than the pixel pitch 33 of the image sensor 31, and it is possible to capture a finer subject. In other words, the image sensor 34, which has a relatively smaller pixel pitch, has a higher resolution than the image sensor 31, and the image sensor 34 is more likely to see finer blurs than the image sensor 31.

[0048] Therefore, when the lens device 2 of this embodiment is attached to a camera body having the image sensor 34 of FIG. 3(b), the drive control parameters are changed so that the responsiveness of the lens side shake correction unit 13 is higher than when the lens device 2 is attached to a camera body having the image sensor 31 of FIG. 3(a).

[0049] FIG. 3(c) shows MTF (Modulation Transfer Function) curves of two imaging optical systems. The MTF curve is a graph with spatial frequency on the horizontal axis and contrast on the vertical axis, and is known as a graph showing the resolving power of an imaging optical system. The MTF curve shows how faithfully an imaging optical system can transmit a signal to an object having a certain spatial frequency, and it is generally said that the higher the contrast is at each spatial frequency, the higher the resolving power is. Curve 37 shows the MTF curve of a certain lens device, and curve 38 shows the MTF curve of a lens device with a higher resolving power than the lens device of MTF curve 37. As shown in FIG. 3(c), the imaging optical system with MTF shown by MTF curve 38 has a higher contrast for each spatial frequency than the imaging optical system with MTF shown by MTF curve 37. In other words, the imaging optical system with MTF shown by MTF curve 38 is capable of sufficiently expressing an object (capturing a finer object) for each spatial frequency. In other words, the first photographing optical system, whose MTF is represented by the MTF curve 38, has higher resolution than the second photographing optical system, whose MTF is represented by the MTF curve 37, and small blurs are easier to see.

[0050] Therefore, when the lens device 2 having the first photographing optical system is attached to the camera body 1 of this embodiment, the drive control parameters are changed so that the responsiveness of the camera-side shake correction unit 14 is higher than when the lens device 2 having the second photographing optical system is attached. Note that the resolving power of the photographing optical system may be determined based on the number of resolvable lines per mm (lines / mm) in the image space, rather than the MTF curve itself. A specific example of changing the drive control parameters will be described with reference to FIG. 4.

[0051] <Changes to drive control parameters> Next, the change in responsiveness caused by changing the drive control parameters of the shake correction unit will be described with reference to Fig. 4. Fig. 4 is a diagram for explaining the change in responsiveness of the shake correction unit (13, 14) on the lens side and the camera side in this embodiment, and is a graph showing the frequency characteristics of the shake correction unit. Fig. 4(a) is a graph showing the gain of the frequency response, and Fig. 4(b) is a graph showing the phase of the frequency response.

[0052] In FIG. 4(a), curves 41 and 42 show an example of the frequency characteristic of the control gain (hereinafter, referred to as the gain at the end) of the shake correction unit. The vertical axis shows the gain, and when the gain=0, it indicates that the lens side / camera side shake correction unit (13, 14) can actually drive by the input drive amount. Also, when the gain is smaller than 0 (downward on the paper), it indicates that a difference occurs between the drive amount input from the control unit and the actual drive amount. Also, the horizontal axis shows the frequency, and the gain at a higher frequency is shown toward the right side of the paper. When the responsiveness of the shake correction unit (camera side shake correction unit 14 or lens side shake correction unit 13, or both) is to be increased, the gain characteristic is changed from curve 41 to curve 42. Specifically, when the responsiveness of the camera side shake correction unit 14 is to be increased, the value of the camera side gain compensator 5c in FIG. 2(a) is increased. Also, when the responsiveness of the lens side shake correction unit 13 is to be increased, the value of the lens side gain compensator 12c in FIG. 2(b) is increased. As a result, the gain of the frequency response of the blur correction unit changes from curve 41 to curve 42, so that the gain is raised in the high frequency band, and the blur correction unit can respond even at higher frequencies. There is no particular limit to the way in which the gain is changed. For example, when the resolution of the imaging system based on the resolution of the image sensor 6 and the resolution of the imaging optical system 3 is equal to or higher than a predetermined value, the gain characteristic may be switched from curve 41 to curve 42. Also, the gain may be changed according to the resolution of the imaging system so that the higher the resolution, the closer the gain characteristic is to curve 42 from curve 41. When the resolution of the imaging system is less than a predetermined value, the gain characteristic may be set to curve 41, and when the resolution is equal to or higher than the predetermined value, the gain characteristic may be set to approach curve 42 as the resolution increases, and when the resolution reaches another predetermined value, the gain may be set to be constant at curve 42. Also, the same applies when changing the responsiveness according to the shutter speed. The gain characteristic may be switched depending on whether the shutter speed is faster than a predetermined value, or the gain may be set so that the gain characteristic approaches curve 42 from curve 41 as the shutter speed becomes faster.

[0053] In FIG. 4(b), curves 43 and 44 show examples of the frequency response of the phase of the shake correction unit. The vertical axis shows the phase, and the upper part of the paper shows a smaller phase delay from when the drive amount is input from the control unit to when the drive is actually completed, and the lower part of the paper shows a larger phase delay. The horizontal axis shows the frequency, and the gain at a higher frequency is shown toward the right side of the paper. When the responsiveness of the shake correction unit (camera side shake correction unit 14 or lens side shake correction unit 13, or both) is to be increased, the phase characteristic is changed from curve 43 to curve 44. Specifically, when the responsiveness of camera side shake correction unit 14 is to be increased, the value of camera side phase compensator 5d in FIG. 2(a) is changed to shift the phase delay to the high frequency side. When the responsiveness of lens side shake correction unit 13 is to be increased, the value of lens side phase compensator 12d is changed to shift the phase delay to the high frequency side. As a result, the phase of the frequency response of the image stabilization unit changes from curve 43 to curve 44, so that the phase delay shifts to the high frequency side, and the responsiveness of the image stabilization unit improves even at higher frequencies. Note that, like the change in gain, the phase may be changed by switching the phase from curve 43 to curve 44 when the resolution of the imaging system is equal to or greater than a predetermined value, or the phase may be changed gradually according to the resolution. The same is true when changing the responsiveness according to the shutter speed; the phase setting may be switched depending on whether the shutter speed is faster than a predetermined value, or the phase may be set so that the phase characteristic approaches curve 42 from curve 41 as the shutter speed becomes faster. The responsiveness may be changed by changing both the phase and the gain.

[0054] In this manner, in this embodiment, the control parameters of the image stabilization unit are changed in accordance with shooting conditions such as the resolution of the imaging system and the shutter speed, thereby improving responsiveness up to higher frequencies.

[0055] In this embodiment, the parameters of the gain compensator (5c, 12c) and the phase compensator (5d, 12d) are changed to improve responsiveness, but the method of changing the control parameters of the shake correction unit is not limited to this. For example, the parameters of the PID control may be changed.

[0056] <Explanation about the flow chart> Next, the vibration reduction control flow of the camera body 1 in this embodiment will be described with reference to Fig. 5. The flow of Fig. 5 starts when the power of the camera body 1 is turned on, and is performed by the camera system control unit 5 acquiring and controlling various information from each unit in the camera body and the lens system control unit 12. This flow may also be started in response to switching from a playback mode, which displays a captured image, to a capture mode, which waits for capture.

[0057] In step S5001, the camera system control unit 5 checks the resolution of the image sensor 6 of the camera body 1, and proceeds to step S5002. One method for checking the resolution of the image sensor 6 is to read out information about the pixel pitch stored in the memory unit 8 as information indicating the resolution. Another possible method is to check the model number of the camera body 1 as information indicating the image sensor resolution, since the model number of the camera body 1 and the image sensor resolution are linked.

[0058] In step S5002, the camera system control unit 5 communicates with the lens system control unit 12 via the electrical contacts 11 to confirm the resolving power of the photographing optical system 3 in the lens device 2, and proceeds to step S5003. The resolving power of the photographing optical system 3 can be confirmed by a method in which the MTF curve of the photographing optical system 3 is stored in the lens system control unit 12 and read out through communication. In the case of a zoom lens, the resolving power changes depending on the focal length, so information on MTF curves corresponding to a plurality of focal lengths may be acquired in this step, and the MTF curve corresponding to the current focal length may be specified in a focal length confirmation step described later. In addition, a table linking the model number of the lens device 2 with information indicating the lens resolution may be stored in the memory unit 8, and information indicating the lens resolution may be acquired by referring to the table based on the model number (ID) of the lens device 2 received from the lens device.

[0059] In step S5003, the camera system control unit 5 determines whether or not the user has input an instruction to start preparation for shooting (so-called half-pressing the shutter release button, S1), and if an instruction to start preparation for shooting has been input, proceeds to step S5004, and if not, waits.

[0060] In step S5004, the camera system control unit 5 checks the focal length of the photographing optical system 3, and proceeds to step S5005. Here, the method of acquiring the focal length information of the photographing optical system 3 may be a method in which the camera system control unit 5 and the lens system control unit 12 communicate with each other when the power supply of the camera body 1 is turned on, and acquire the focal length information of the photographing optical system 3. As another method, in the case where the lens device 2 is a zoom lens, the camera system control unit 5 and the lens system control unit 12 communicate with each other and acquire the focal length information every time the focal length is changed. The acquired focal length information is stored in the memory unit 8, and in this step, the focal length is confirmed by referring to this information. Alternatively, in step S5004, communication may be performed again to acquire the focal length, and the focal length may be confirmed.

[0061] In step S5005, the camera system control unit 5 checks the shutter speed, and the process proceeds to step S5006. Here, the method of checking the shutter speed includes a method of reading the shutter speed set by the user, and a method of reading the shutter speed determined by an AE (Auto Exposure) means (not shown).

[0062] In step S5006, the camera system control unit 5 determines whether or not the user has input an instruction to start shooting (so-called pressing of the shutter release button, S2), and if an instruction to start shooting has been input, proceeds to step S5007, and if not, returns to step S5003.

[0063] In step S5007, the camera system control unit 5 determines whether the shutter mode is the electronic shutter mode or the electronic front-curtain shutter mode. If the shutter mode is the electronic shutter mode or the electronic front-curtain shutter mode, the process proceeds to step S5008. If not, the process proceeds to step S5009.

[0064] In step S5008, camera system control unit 5 changes the responsiveness of camera-side shake correction unit 14 based on the resolution and shutter speed of the imaging system. The resolution of the imaging system can be acquired based on the resolution of imaging element 6 confirmed in step S5001, the resolution of imaging optical system 3 confirmed in step S5002, and the focal length confirmed in step S5004. For example, the resolution of the imaging optical system acquired based on the focal length of the current imaging optical system may be compared with the resolution of the imaging element, and the resolution of the lower resolution may be set as the resolution of the imaging system. If the resolution of the imaging system is equal to or lower than a predetermined value and the shutter speed is equal to or lower than a predetermined value (i.e., the same as or slower than the predetermined value), the normal drive control parameters (first parameters) are left set. On the other hand, if the resolution of the imaging system is higher than the predetermined value and if the shutter speed is higher than the predetermined value, the drive control parameters (second parameters) that increase the responsiveness of the shake correction unit more than when the first parameters are set are set, as described in FIG. 4. After the setting, the process proceeds to step S5009. Note that, although the description has been given assuming that the first parameter is set in advance, if the resolution of the imaging system is equal to or lower than a predetermined value and the shutter speed is equal to or lower than a predetermined value, the first parameter may be set, and if not, the second parameter may be set.

[0065] In step S5009, camera system control unit 5 starts driving camera side shake correction unit 14, and proceeds to step S5010. In this embodiment, shake correction is performed by moving image sensor 6 based on the detection result of camera side shake detection unit 15. Furthermore, in this embodiment, lens device 2 also includes lens side shake correction unit 13, so that the detected shake is shared between the camera side and the lens side to perform shake correction. There is no particular limit to the sharing method, but for example, shake correction may be performed so that the camera side and the lens side each correct the amount of shake according to the sharing ratio of the detected amount of shake according to the sharing ratio determined before this step. For example, when the sharing ratio is 1:1, camera system control unit 5 controls camera side shake correction unit 14 to correct the amount of shake obtained by multiplying the detection result of camera side shake detection unit 15 by 0.5.

[0066] In step S5010, camera system controller 5 starts exposure of image sensor 6, captures an image for a period of time corresponding to the shutter speed read out in step S5005, and proceeds to step S5011. In step S5011, driving of camera-side shake correction unit 14 is stopped, and the process proceeds to step S5012.

[0067] In step S5012, the camera system control unit 5 determines whether or not to end the shooting mode based on user input, etc., and if the shooting mode is to be ended, the flow ends, and if not, the flow returns to step S5003.

[0068] In addition, in FIG. 5, it has been described that the camera system control unit 5 controls the camera body 1 in each control flow, but the lens system control unit 12 may control the camera body 1 in each control flow.

[0069] Fig. 6 is a vibration isolation control flow of the lens device 2 in this embodiment. The flow of Fig. 6 starts when the power of the camera body 1 is turned on, and is performed by the lens system control unit 12 acquiring and controlling various information from each unit in the lens device and the camera system control unit 5. This flow may also be started in response to switching of the camera body 1 from a playback mode, which displays a captured image, to a capture mode, which waits for capture.

[0070] In step S6001, the lens system control unit 12 communicates with the camera system control unit 5 via the electrical contacts 11 to confirm the resolution of the image sensor 6 in the camera body 1, and proceeds to step S6002. The resolution of the image sensor 6 can be confirmed by acquiring pixel pitch information from the camera system control unit 5 as information indicating the resolution. Alternatively, a table linking the model number of the camera body 1 with the image sensor resolution is stored in a memory unit (not shown) in the lens, and the image sensor resolution can be confirmed based on the model number (ID) of the camera body received from the camera body.

[0071] In step S6002, the lens system control unit 12 checks the resolving power of the photographic optical system 3, and the process proceeds to step S6003. In order to check the resolving power of the photographic optical system 3, a method of reading out information about an MTF curve of the photographic optical system 3 stored in a memory unit (not shown) can be used.

[0072] In step S6003, the lens system control unit 12 determines whether or not a notification that a shooting preparation start instruction (so-called half-pressing the shutter release button, S1) has been input by the user has been received from the camera system control unit 5. If a shooting preparation start instruction has been input, the process proceeds to step S6004, and if not, the process waits.

[0073] In step S6004, the lens system control unit 12 checks the focal length of the photographing optical system 3, and the process proceeds to step S6005.

[0074] In step S6005, the lens system control unit 12 checks the shutter speed, and proceeds to step S6006. Information on the shutter speed is received through communication with the camera system control unit 5. The shutter speed checked here does not have to be the shutter speed itself, as long as it is information indicating the shutter speed. For example, as described in the flow diagram of FIG. 5, in order to increase responsiveness when the shutter speed is equal to or less than a predetermined value, information on whether the shutter speed is greater than a predetermined value (i.e., faster) or not may be obtained.

[0075] In step S6006, the lens system control unit 12 receives information indicating whether the shutter mode is the electronic shutter mode or the electronic front-curtain shutter mode from the camera system control unit 5. As a result, if it is the electronic shutter mode or the electronic front-curtain shutter mode, the process proceeds to step S6007, and if not, the process proceeds to step S6008.

[0076] In step S6007, the lens system control unit 12 sets the responsiveness of the image stabilization unit based on the resolution and shutter speed of the imaging system. The method of setting the responsiveness is the same as in step S5008, and therefore a description thereof will be omitted.

[0077] In step S6008, lens system control unit 12 starts driving lens side shake correction unit 13, and the process proceeds to step S6009. In this embodiment, shake correction is performed by moving shake correction lens 3a based on the detection result of lens side shake detection unit 16. Note that in this embodiment, camera side shake correction unit 14 starts shake correction after a shooting start command is input, so camera side shake correction unit 14 does not perform shake correction while this step is being executed. Therefore, shake correction is performed only on the lens side here, rather than shake correction shared between the camera side and the lens side as described in step S5009 above.

[0078] In step S6009, the lens system control unit 12 determines whether or not a notification that a shooting start instruction (S2) has been input by the user has been received from the camera system control unit 5. If a shooting start instruction has been input, the process proceeds to step S6010, and if not, the process returns to step S6003.

[0079] In step S6010, lens system control unit 12 continues shake correction by changing the drive method of lens side shake correction unit 13 from a shake correction method by lens side shake correction unit 13 alone to a shake correction method in cooperation with camera side shake correction unit 14. Here, shake correction is performed with the camera side and lens side sharing the work, as described in step S5009 above.

[0080] In step S6011, the lens system control unit 12 determines whether or not shooting by the camera body 1 has ended. This determination may be made based on whether or not a notification that shooting has ended has been received from the camera body 1, or based on whether or not the time equivalent to the shutter speed confirmed in S6005 has elapsed since the start of shooting. If shooting has ended, the process proceeds to step S6012, and if not, the process waits.

[0081] In step S6012, the lens system control unit 12 determines whether or not a notification to end the shooting mode has been received from the camera system control unit 5. If a notification to end the shooting mode has been received, the flow ends, and if no notification has been received, the flow returns to step S6003.

[0082] 5 and 6, a case has been described in which both the camera body 1 and the lens device 2 are provided with a shake correction unit, and the responsiveness of both is set based on the resolution and shutter speed of the imaging system. However, this embodiment is not limited to this, and the responsiveness of only one of the camera side shake correction unit 14 or the lens side shake correction unit 13 may be changed. For example, in the case of a combination of a camera body with a shake correction unit and a lens device without a shake correction unit in an imaging system, the drive control parameters of the camera side shake correction unit 14 are changed according to the resolution of the imaging element, the resolution and focal length of the photographing optical system, and the shutter speed. In the case of a combination of a camera body without a shake correction unit and a lens device with a shake correction unit, the drive control parameters of the lens side shake correction unit 13 are changed according to the resolution of the imaging element, the resolution and focal length of the photographing optical system, and the shutter speed. Even when both the camera body side and the lens device side are provided with shake correction units, a form in which the responsiveness of only one of them is changed may be used. For example, an effect can be obtained by configuring the phase compensator 5d and the gain compensator 5c of the camera-side target value generation unit 5b to have fixed characteristics, and only the image blur correction system on the lens device 2 side to change its responsiveness in accordance with the resolution of the imaging system.

[0083] 5, an example has been described in which the camera system control unit 5 checks the resolution of the image sensor in step S5001, checks the resolution of the photographing optical system in step S5002, and further acquires the resolution of the image sensor in step S50008. However, the method of acquiring the resolution of the image sensor is not limited to this. For example, when checking the resolution of the photographing optical system, the resolution of the image sensor may be acquired by determining whether the resolution of the photographing optical system is equal to or greater than a predetermined value. This predetermined value is a value that is set in advance according to the resolution of the image sensor. If the resolution of the photographing optical system is less than the predetermined value, a first responsiveness according to the resolution of the image sensor may be set as the responsiveness of the camera side shake correction unit 14, and if the resolution of the photographing optical system is equal to or greater than the predetermined value, a second responsiveness according to the resolution of the photographing optical system may be set as the responsiveness of the camera side shake correction unit 14. The first responsiveness may be the default responsiveness of camera side shake correction unit 14, and the responsiveness of camera side shake correction unit 14 may be changed to a second responsiveness that is higher than the first responsiveness only when the resolution of the photographing optical system is equal to or higher than a predetermined value. In this case as well, the second responsiveness may be made higher as the resolution of the photographing optical system becomes higher, or a uniform responsiveness that is higher than the first responsiveness may be set when the resolution of the photographing optical system is equal to or higher than a predetermined value.

[0084] In addition, in FIG. 6, the responsiveness of the image stabilization unit is changed (S6007) and then the image stabilization unit is driven (single) (S6008). However, the order of the processes is not particularly important as long as the responsiveness of the image stabilization unit is changed to the second parameter when exposure is performed in a state where specified conditions are satisfied.

[0085] As described above, by switching the characteristics of the image stabilization control unit according to the resolution of the image sensor and the photographing optical system, it becomes possible to perform accurate camera shake correction in a system using a lens and image sensor with high resolution. Furthermore, by switching the characteristics of the image stabilization control unit according to the shutter speed, it becomes possible to perform accurate camera shake correction regardless of differences in photographing conditions. EXAMPLES

[0086] Hereinafter, an imaging system according to a second embodiment of the present invention will be described with reference to Figs. 7-8. In this embodiment, an imaging system that increases the responsiveness of the shake correction in the entire imaging system when the shutter speed is equal to or greater than a predetermined value by changing the way in which the lens side shake correction unit 13 and the camera side shake correction unit 14 share the shake correction is controlled so that, when the shutter speed is equal to or greater than a predetermined value, the lens side or camera side shake correction system that has a higher shake correction responsiveness is controlled to share the correction of the high frequency band of the shake signal, and the other is controlled to share the correction of the low frequency band. On the other hand, when the shutter speed is less than a predetermined value (slower than the predetermined value), each of the lens side and camera side shake correction systems corrects the shake of the detected shake signal according to the sharing ratio. The basic configuration is the same as that of the first embodiment described with reference to Figs. 1 and 2, so only differences will be described in detail.

[0087] The configurations of a camera-side image stabilization system and a lens-side image stabilization system in this embodiment will be described with reference to FIG.

[0088] Figure 7 shows a control block diagram of a camera side image stabilization system provided in camera body 1 and a lens side image stabilization system provided in lens device 2. Figure 7(a) shows a control block diagram of the camera side image stabilization system, and Figure 7(b) shows a control block diagram of the lens side image stabilization system. Since the basic configuration is the same as the first embodiment described in Figure 2, only the differences will be described in detail.

[0089] In Fig. 7(a), camera system control unit 5 has responsiveness determination unit 61 for changing control based on the responsiveness of each of the camera side shake correction system and the lens side shake correction system. Based on information from both the camera side shake correction system and the lens side shake correction system, responsiveness determination unit 61 compares the responsiveness of each and determines which has higher responsiveness (better responsiveness in the high frequency band). At this time, information referred to by responsiveness determination unit 61 includes the weights and frequency responses (motor drive characteristics) of the moving parts of camera side shake correction unit 14 and lens side shake correction unit 13, and the sensitivity characteristics of camera side shake detection unit 15 and lens side shake detection unit 16. Possible methods for determining which has higher high frequency responsiveness include the one with a lighter weight of the moving parts of the shake correction unit and the one whose frequency response (motor drive characteristics) can follow up to higher frequencies. The sensitivity characteristics of the shake detection unit may include a high detection sensitivity to shakes of high frequencies, or a higher cutoff frequency of a low-pass filter used for signal processing inside the shake detection unit (high-frequency signals are also output). A table linking information indicating responsiveness with the model number of the lens device may be stored in advance in the memory unit, and the responsiveness of the lens side shake correction system may be obtained based on the received model number of the lens device 2, and the responsiveness of the shake correction system may be compared based on this. Since the responsiveness of the camera side shake correction system is known, the responsiveness determination unit 61 may store the comparison results for each model number of the lens device in the memory unit. For example, it is sufficient to store information such as the responsiveness of the camera side shake correction system being lower than that of the shake correction system of the lens device of model number x and higher than that of the shake correction system of the lens device of model number y. Alternatively, the lens device 2 may hold an evaluation value indicating the responsiveness of the lens side shake correction system, and the responsiveness determination unit 61 may determine the responsiveness by transmitting this to the camera system control unit 5.

[0090] The camera system control unit 5 of this embodiment changes the control of the correction in the camera-side and lens-side shake correction systems based on the shutter speed stored in the shutter speed storage unit 5e and the responsiveness of each shake correction system determined by the responsiveness determination unit 61. Specifically, the responsiveness determination unit 61 determines whether the camera-side shake correction system or the lens-side shake correction system has a higher high-frequency responsiveness, and determines a frequency sharing method for performing correction in each shake correction system according to the shutter speed. As shown in FIG. 7(b), the lens system control unit 12 receives the determination result by the responsiveness determination unit 61 and the shutter speed stored in the shutter speed storage unit 5e from the camera system control unit 5. Then, it determines a frequency sharing method for performing correction in each shake correction system according to the shutter speed.

[0091] The sharing method will now be explained. When shake correction is performed using both a camera side shake correction system and a lens side shake correction system, each shake correction system operates according to the output of each shake detection unit (camera side shake detection unit 15 and lens side shake detection unit 16). In this case, if each shake correction unit corrects all of the shake amounts detected by each shake detection unit, excessive shake correction may occur.

[0092] Therefore, in this embodiment, as described above, when the shutter speed is less than a predetermined value, each of the lens side and camera side shake correction systems corrects the detected shake signal according to the sharing ratio. This sharing method is called the first method here. In this method, for example, by correcting half of the shake amount detected by each shake detection unit in each shake correction unit, it is possible to avoid excessive shake correction. This method can be realized by multiplying the shake amount detected by each shake detection unit or the drive amount of the shake correction unit by a certain ratio (performing gain compensation), so it is relatively easy to configure a controller. In addition, the sharing ratio can be determined according to the correction stroke (moving amount) of each shake correction unit. This makes it difficult to generate a case where, regardless of the frequency of the input shake, one stroke has a margin, but the other stroke hits the end of the movable range, resulting in a state where correction is not possible (stroke out).

[0093] On the other hand, when the shutter speed is equal to or greater than a predetermined value, the system controls the lens or camera shake correction system so that the one with the higher shake correction response is responsible for correcting the high-frequency band of the detected shake signal, and the other is responsible for correcting the low-frequency band. This sharing method is called the second method here. With this method, by having the one with the higher shake correction response correct the high-frequency band of the detected shake signal, it is possible to reduce residual blur for high-frequency shake that is more visible when the shutter speed is fast.

[0094] Here, the explanation will be given on the assumption that the lens side image stabilization system is determined to have higher responsiveness as a result of the determination by responsiveness determination unit 61. The first method and the second method differ in the processing by camera side filter processor 5a and the processing by lens side filter processor 12a.

[0095] The processing by the camera side filter processor 5a and the processing by the lens side filter processor 12a in the first method will be described. As shown in FIG. 7(a), the camera system controller 5 performs high-pass filtering on the signal obtained from the camera side shake detector 15 in the shake signal filter processor 74 based on the characteristics of the camera side shake detector 15 to remove noise and the like. In the first method, the signal is then multiplied by a gain in the gain compensator 73 along the dotted line path after being filtered. The configurations of the shake signal filter processor 74 and the gain compensator 73 are the same as those of the camera side filter processor 5a in the first embodiment. The output of the gain compensator 73 is input to the phase compensator 5d, and the phase and gain characteristics are changed as in the first embodiment, before being input to the camera side shake correction unit 14.

[0096] The processing by the lens side filter processor 12a is similar. As shown in FIG. 7(b), the lens system controller 12 performs high-pass filtering on the signal from the lens side shake detector 16 in the shake signal filter processor 76 based on the characteristics of the lens side shake detector 16. In the first method, the signal is then passed through the dotted line path, and the filtered detection signal is multiplied by a gain in the gain compensator 75. The configurations of the shake signal filter processor 76 and the gain compensator 75 are the same as those of the camera side filter processor 5a in the first embodiment. The output of the gain compensator 75 is input to the phase compensator 12d, and the phase and gain characteristics are changed as in the first embodiment, before being input to the lens shake correction unit 13. In this way, in the first method, the detected shake signal is multiplied by the sharing ratio in the gain compensators 5c and 12c, and each shake correction system corrects the amount of shake according to the sharing ratio.

[0097] On the other hand, in the second method, the camera-side and lens-side filter processors 5a and 12a perform filter processing so that the lens-side image stabilization system determined to have high responsiveness by the responsiveness determination unit 61 corrects the high-frequency band, and the other camera-side image stabilization system corrects the low-frequency band. Specific processing by the camera-side filter processor 5a and the lens-side filter processor 12a will be described below.

[0098] In the second method, the blur signal filtered by the blur signal filter processor 74 in Fig. 7(a) follows the path indicated by the solid line. The path indicated by the solid line is made up of a high-pass filter 71 (hereinafter abbreviated as HPF) and a gain compensator 72.

[0099] 7(b), in the second method, the blur signal filtered by the blur signal filter 76 follows the path indicated by the solid line. This path is made up of a high-pass filter (abbreviated as HPF) and a gain compensator 72.

[0100] When using multiple image stabilization systems to share the frequency of correction, one method is to incorporate an HPF with a certain cutoff frequency into one image stabilization system and subtract an HPF with the same cutoff frequency from the image stabilization signal in the other system.

[0101] In the path shown by the solid line in FIG. 7(b), the lens side filter processing unit 12a of the lens side shake correction system is provided with an HPF 71 and a gain compensator 72 for the shake signal input from the lens side shake detection unit 16. On the other hand, in the path shown by the solid line in FIG. 7(a), the camera side filter processing unit 5a is configured to subtract the shake signal that has passed through the HPF 71 and the gain compensator 72 from the shake signal input from the camera side shake detection unit 15. With this configuration, the signal is processed through the HPF in one shake correction system and through the (1-HPF) in the other shake correction system, so that it is possible to share and control the frequency between the two. Also, in this embodiment, an example in which the HPF and the (1-HPF) are provided for each signal processing system has been described, but a low pass filter (hereinafter referred to as LPF) may be used. In this case, just like with the HPF, the signal is processed through an LPF in one image stabilization system and through (1-LPF) in the other image stabilization system, making it possible to share and control the frequency between the two systems.

[0102] Next, the frequency characteristics of the image stabilization systems on both the camera side and the lens side in this embodiment will be described with reference to FIG.

[0103] FIG. 8(a) shows the frequency characteristics of the camera-side image stabilization system and the lens-side image stabilization system when they share the role of correcting image stabilization using the first method. As in FIG. 4(a), the vertical axis shows the gain, and the horizontal axis shows the frequency. As shown in FIG. 8(a), the camera-side image stabilization system and the lens-side image stabilization system are often designed to have frequency characteristics that cover the overall frequency band of image stabilization so that they can operate independently. In FIG. 8(a), the frequency characteristics of the camera-side image stabilization unit 81 and the frequency characteristics of the lens-side image stabilization unit 82 are also designed to cover the same frequency band. In reality, the frequency characteristics of the two image stabilization systems differ depending on the characteristics such as the weight of the member (movable member) that is moved when performing image stabilization and the size of the drive unit. FIG. 8(a) shows that the frequency characteristic 82 of the lens-side image stabilization unit, which has a lighter moving member, can cover the higher frequency side (i.e., has higher responsiveness).

[0104] FIG. 8(b) shows the frequency characteristics of each of the shake correction systems when the camera side shake correction system and the lens side shake correction system share the role of correcting shake using the second method. Here, too, the vertical axis shows gain, and the horizontal axis shows frequency. As shown in FIG. 8(b), the frequency characteristic 83 of the camera side shake correction unit corresponds to the frequency characteristic obtained by passing through (1-HPF) having a certain cutoff frequency 85. On the other hand, the frequency characteristic 84 of the lens side shake correction unit corresponds to the frequency characteristic obtained by passing through HPF 71 having a certain cutoff frequency 85, as shown in FIG. 7(b). As shown in FIG. 8(a), each shake correction system is good at correcting different frequency bands. Therefore, in this embodiment, when the shutter speed is fast and high-frequency shake is easily visible, shake correction in the high-frequency band is performed using the lens side shake correction unit 13 that is good at correcting shake in the high-frequency band (i.e., has high responsiveness). Then, camera-side shake correction unit 14, which is poor at correcting high-frequency band shake compared to the lens-side correction unit (i.e., it has low responsiveness and is prone to residual shake when attempting to correct high-frequency band shake), is used to correct low-frequency band shake. That is, in the first method, the camera-side shake correction unit with frequency characteristic 81 is also tasked with correcting high-frequency band shake where gain is reduced, but in the second method, the lens-side shake correction unit with high responsiveness corrects high-frequency band shake. In this way, by sharing the frequency and driving both shake correction units, it is possible to reduce the amount of residual shake compared to the first method, even when high-frequency shake is input, such as when the shutter speed is fast. Note that at frequencies around the cutoff frequency, frequency characteristic 83 of the camera-side shake correction unit and frequency characteristic 84 of the lens-side shake correction unit overlap, and the camera-side shake correction unit also corrects part of the shake at frequencies higher than cutoff frequency 85. However, in this specification and the present invention, the frequency band that the camera-side image stabilizer corrects is considered to be a frequency band (first frequency band) lower than the cutoff frequency, and similarly, the frequency band that the lens-side image stabilizer corrects is considered to be a frequency band (second frequency band) higher than the cutoff frequency.In other words, the cutoff frequency is regarded as the boundary between blur that is the target of correction by the camera-side blur correction section and blur that is the target of lens-side blur correction.

[0105] Next, the vibration reduction control flow of the camera body 1 in this embodiment will be described with reference to Fig. 9. As for the flowchart in this embodiment, only the parts that differ from those shown in Fig. 5 will be described. As with Fig. 5, this flow starts when the power of the imaging device is turned on, and is performed by the camera system control unit 5 acquiring various information from each unit in the camera body and the lens system control unit 12 and controlling them.

[0106] In step S9001, camera system control unit 5 checks the responsiveness of the camera side shake correction system, and proceeds to step S9002. In step S9002, camera system control unit 5 communicates with lens system control unit 12 via electrical contacts 11 to check the responsiveness of the lens side shake correction system, and proceeds to step S5003. The responsiveness checked in steps S9001 and S9002 may be any of the following information on the responsiveness of the shake correction system, or information based on such information, as described above as information referred to by responsiveness determination unit 61. Examples include the weight of the movable parts of camera side shake correction unit 14 and lens side shake correction unit 13, frequency response (motor driving characteristics), and sensitivity characteristics of camera side shake detection unit 15 and lens side shake detection unit 16. Steps S5003 to S5007 are the same as steps S5003 to S5007 in FIG. 5, and therefore will not be described here. In steps S9001 and S9002, the responsiveness of each image stabilizer system is confirmed, and when an instruction to start shooting using the electronic front curtain is input, the process proceeds to step S9008.

[0107] In step S9008, the camera system control unit 5 determines the sharing method according to the shutter speed, sets the frequency characteristics of each blur correction unit based on the result of the determination and the responsiveness of each blur correction system, and proceeds to step S5009. In this step, as described above, when the shutter speed is less than a predetermined value, the responsiveness of each blur correction unit is set so as to have the frequency characteristics shown in FIG. 8(a), and sharing is performed using the first method. On the other hand, when the shutter speed is equal to or greater than a predetermined value, the responsiveness is set so that the blur correction system determined to have high high frequency responsiveness performs high frequency side blur correction, and the other performs low frequency side blur correction, as shown in FIG. 8(b), in a second method.

[0108] Steps from S5009 onwards are similar to steps S5009 to S5012 in FIG. 5, and therefore the description will be omitted.

[0109] 6, the resolution confirmation steps S6001 and S6002 are replaced with a step of receiving the result of determination by responsiveness determination unit 61 from camera body 1. Furthermore, the response setting step of the shake correction unit in step S6007 is replaced with a response setting step based on the shutter speed and the response of each shake correction system, as in step S9008. Other points are the same as in the flow in FIG. 6, so description will be omitted.

[0110] In the above embodiment, both the camera body 1 and the lens device 2 determine the sharing method of the camera side and the lens side shake correction based on the judgment result by the responsiveness judgment unit 61 and the shutter speed. However, a configuration in which one of them determines the sharing method and the other receives the decision result may be adopted. For example, the camera system control unit may determine whether the sharing method is the first method or the second method based on the judgment result by the responsiveness judgment unit 61 and the shutter speed, and transmit the decision result to the lens system control unit 12 via the electrical contact 11. Instead of receiving the judgment result by the responsiveness judgment unit 61, the lens system control unit receives information indicating the sharing method from the camera body 1 and operates the lens side shake correction system in the sharing method instructed by the camera.

[0111] In the above embodiment, the sharing method of the camera side and the lens side blur correction system is determined according to the shutter speed, but the sharing method may be determined based on the resolution of the imaging system in addition to the shutter speed. This is because when the resolution of the imaging system is low, high-frequency blur is difficult to see even if the shutter speed is fast, so the remaining blur is not noticeable even in the first method. For example, in the form in which the second method is used when the shutter speed is equal to or higher than a predetermined value as described above, the lower the resolution of the imaging system, the larger (faster) the predetermined value is, and the higher the resolution, the smaller (slower) the predetermined value is. Also, when the resolution of the imaging system is equal to or lower than a predetermined value and the shutter speed is less than a predetermined value, the first method may be used, and when the resolution of the imaging system is higher than a predetermined value or when the shutter speed is equal to or higher than a predetermined value, the second method may be used. However, when the shutter speed is fast, the amount of blur (accumulated amount) occurring during the shooting period is small, and even if the second method is adopted, stroke shortage is unlikely to occur, so the second method may be adopted regardless of the resolution as in the above embodiment. On the other hand, similarly to the first embodiment, the first method or the second method may be selected according to the resolution of the imaging system regardless of the shutter speed. When the resolution of the imaging system is higher than a predetermined value, the second method may be selected, and when the resolution is equal to or lower than the predetermined value, the first method may be selected.

[0112] As described above, in this embodiment, when shake correction is performed using both a camera-side shake correction system and a lens-side shake correction system, the sharing method is changed based on the shutter speed and the responsiveness of each shake correction system. As a result, under shooting conditions where the shutter speed is fast and high-frequency shake is easily noticeable, it is possible to increase the responsiveness of shake correction in the entire imaging system that combines the camera-side shake correction system and the lens-side shake correction system. This makes it possible to perform shake correction with little residual shake. EXAMPLES

[0113] An imaging system according to a third embodiment of the present invention will now be described with reference to Fig. 10. This embodiment is an embodiment in which the method of changing the control of each image stabilization system in the second embodiment is different.

[0114] In this embodiment, when shake correction is performed using both the camera-side shake correction system and the lens-side shake correction system, regardless of the shutter speed, the shake correction units are controlled using the second method, and the switching frequency is changed depending on the shutter speed.

[0115] Since the basic configuration is similar to that of the second embodiment described using Figures 7 to 9, only the differences will be described in detail. However, in this embodiment, the paths indicated by dotted lines between the camera side filter processor 5a and the lens side filter processor 12a shown in Figure 7 are not required, and therefore gain compensators 73 and 75 are not required.

[0116] Using Fig. 10, the change in frequency characteristic of each blur correction system in this embodiment will be described. In this embodiment, as in the second embodiment, the lens side blur correction unit has higher responsiveness. Fig. 10 is a graph showing the frequency characteristic of each blur correction system, as in Fig. 8, where the vertical axis indicates gain and the horizontal axis indicates frequency. Fig. 10(a) shows an example of the frequency characteristic of each blur correction system when the shutter speed is less than a predetermined value, and Fig. 10(b) shows an example of the frequency characteristic of each blur correction system when the shutter speed is equal to or greater than a predetermined value.

[0117] 10(a), the frequency band lower than the cutoff frequency 103 of HPF 71 is corrected by the camera side, and the higher frequency band is corrected by the image blur correction unit on the lens side. For this reason, the frequency characteristic 101 of the camera side image blur correction unit is such that the gain gradually decreases from a frequency slightly lower than the cutoff frequency 103. On the other hand, the frequency characteristic 102 of the lens side image blur correction unit is such that the gain gradually decreases from a frequency slightly higher than the cutoff frequency 103.

[0118] 10(b), a cutoff frequency 106 higher than that in FIG. 10(a) is set as the cutoff frequency of HPF 71. Therefore, in the frequency characteristic 104 of the camera side image stabilizer, the gain gradually decreases from a frequency slightly lower than the cutoff frequency 106. On the other hand, in the frequency characteristic 105 of the lens side image stabilizer, the gain gradually decreases from a frequency slightly higher than the cutoff frequency 106.

[0119] As explained in the second embodiment, each image stabilization system has its own frequency band that it is good at when performing image stabilization, and for example, a lens-side image stabilization system with a small moving part weight may have better image stabilization performance on the high frequency side than a camera-side image stabilization system. When the shutter speed is fast, the exposure period of the image sensor 6 is short, and the image stabilization during the exposure period is mainly in the high frequency band. Therefore, when the shutter speed is fast, the high frequency side image stabilization unit is used to correct the high frequency side image stabilization, and the camera-side image stabilization unit is used to correct the low frequency side image stabilization, thereby making it possible to reduce residual image stabilization.

[0120] On the other hand, when the shutter speed is slow, the amount of blur generally tends to be large. Also, the amount of blur tends to be larger on the low frequency side. For these reasons, when the shutter speed is slow, if the cutoff frequency is high when performing blur correction by sharing the frequency, the correction stroke may be insufficient in the blur correction system in charge of the low frequency side. Therefore, in this embodiment, when the shutter speed is less than a predetermined value, the blur correction is performed by sharing the frequency with each blur correction system as shown in FIG. 10(a). Then, when the shutter speed is equal to or greater than the predetermined value, the characteristics of each blur correction system are changed so that the cutoff frequency 106 is higher than the cutoff frequency 103 in FIG. 10(a) as shown in FIG. 10(b).

[0121] As described above, when performing blur correction by sharing frequencies using both the camera-side blur correction system and the lens-side blur correction system, it is possible to reduce residual blur by changing the cutoff frequency of the shared frequency based on the shutter speed. Also, as in the second embodiment, the frequency characteristics may be changed not only based on the shutter speed but also based on the resolution of the imaging system based on the resolution of the lens and camera, or the frequency characteristics may be changed based on the resolution of the imaging system instead of the shutter speed. EXAMPLES

[0122] An imaging device according to a fourth embodiment of the present invention will be described below with reference to Fig. 11. The fourth embodiment is an embodiment in which the method of changing the control of each blur correction system in the second embodiment is different. In this embodiment, when blur correction is performed using both a camera side blur correction system and a lens side blur correction system, the control characteristics of the one with better responsiveness on the high frequency side (here, the lens side blur correction unit) are changed according to the shutter speed. The basic configuration is the same as in the second embodiment described with reference to Figs. 6 to 9, so only the differences will be described in detail.

[0123] Changes in the control characteristics of each shake correction system in this embodiment will be described with reference to Fig. 11. Fig. 11(a) shows an example of the frequency characteristics of each shake correction system when two shake correction systems share the drive amount for control (first method in the second embodiment). Fig. 11(b) shows an example of the frequency characteristics of each shake correction system when two shake correction systems share the frequency for control (second method in the second embodiment). In both figures, the vertical axis shows gain and the horizontal axis shows frequency.

[0124] 11(a) shows the frequency characteristics when control is performed using the first method, so that frequency characteristics 111 of the camera side shake correction unit and frequency characteristics 112 of the lens side shake correction unit almost overlap. Furthermore, in this embodiment, when the shutter speed is less than a predetermined value, the frequency characteristics of the lens side shake correction unit are changed to frequency characteristics 113, which have higher responsiveness than frequency characteristics 112. This makes it possible to make the responsiveness of shake correction higher when the shutter speed is fast and shooting conditions are such that high frequency shake is noticeable than when these conditions are not met.

[0125] 11(b) shows the frequency characteristics when control is performed using the second method, in which frequency characteristic 114 of the camera side shake correction unit is set so as to generally correct shake in a lower frequency band than cutoff frequency 117. Similarly, frequency characteristic 115 of the lens side shake correction unit is set so as to correct shake in a higher frequency band than cutoff frequency 117. Furthermore, in this embodiment, when the shutter speed is less than a predetermined value, the frequency characteristic of the lens side shake correction unit is changed to frequency characteristic 116, which has a higher responsiveness than frequency characteristic 112. This makes it possible to increase the responsiveness of shake correction when the shutter speed is fast and shooting conditions are such that high frequency shake is noticeable, compared to when such conditions are not met.

[0126] In this way, in this embodiment, the frequency characteristics of one of the shake correction systems are changed according to the shutter speed. Basically, when the shutter speed is fast, the characteristics of the shake correction system with high frequency characteristics on the high frequency side are changed, and further changed to improve the characteristics on the high frequency side. Specifically, the parameters of the controller are changed, and changes are made so that the gain on the high frequency side is increased. In this way, the responsiveness of the shake correction section on the high frequency side is improved, and it becomes possible to perform shake correction with high accuracy even when the shutter speed is fast (high frequency shake is input).

[0127] In this embodiment, the responsiveness of the imaging system is changed by changing the frequency characteristics of the lens side image blur correction unit. However, the frequency characteristics of the camera side image blur correction unit may be changed.

[0128] As described above, when performing blur correction using both a camera-side blur correction system and a lens-side blur correction system, it is possible to reduce residual blur by changing the frequency characteristics of one of them based on the shutter speed. Also, as in the second embodiment, the frequency characteristics may be changed not only based on the shutter speed but also based on the resolution of the imaging system based on the resolution of the lens and camera, or the frequency characteristics may be changed based on the resolution of the imaging system instead of the shutter speed. [Explanation of symbols]

[0129] 3. Shooting optical system 5 Camera system control section 6. Image sensor 12 Lens system control unit 13 Lens image stabilization unit 14 Camera shake correction unit 15 Camera shake detection unit 16 Lens shake detector

Claims

1. an acquisition means for acquiring a resolving power of an imaging system based on information indicating a resolving power of an imaging optical system of a lens device and information indicating a resolving power of an imaging element that captures a subject image formed by the lens device; a control means for controlling a correction means for correcting an effect of a shake applied to an imaging device to which the lens device is attached on a captured image; a setting unit that sets a responsiveness of the correction unit controlled by the control unit based on a resolution of the imaging system, the setting means sets, when the resolution of the imaging system is a first value, a higher responsiveness to the correction means than when the resolution of the imaging system is a second value lower than the first value.

2. the acquiring means further acquires information indicating a shutter speed set in the imaging device; the setting means sets the responsiveness of the correction means based on information indicating a resolution of the imaging system and the shutter speed; 2. The image blur correction control device according to claim 1, wherein when the shutter speed is a third value, a higher response is set to the correction means than when the shutter speed is a fourth value slower than the third value.

3. 3. The image stabilization control device according to claim 1, wherein the setting means increases the control gain of at least a part of a frequency band to increase the responsiveness.

4. 4. The image stabilization control device according to claim 1, wherein the setting means increases the response by advancing the phase of at least the first frequency band.

5. 3. The image blur correction control device according to claim 1, wherein the setting means sets the responsiveness of the correction means based on a resolution of the imaging system when an electronic front curtain shutter or an electronic shutter is selected as the shutter method of the imaging device.

6. 6. The image stabilization control device according to claim 1, wherein the information indicating the resolution of the image sensor is based on a pixel pitch of the image sensor.

7. 7. The image stabilization control device according to claim 1, wherein the setting means sets the responsiveness of the image stabilization operation performed during exposure of the image pickup device based on a resolution of the image pickup system.

8. 8. The image blur correction control device according to claim 1, wherein the information indicating the resolving power of the photographing optical system is based on an MTF curve indicating the level of contrast for each spatial frequency of the photographing optical system.

9. 9. The image blur correction control device according to claim 1, wherein the information indicating the resolving power of the photographing optical system is changed in accordance with a change in the focal length of the photographing optical system.

10. 8. The image stabilization control device according to claim 1, wherein the setting means increases the responsiveness of the image stabilization as the resolution of the imaging system increases.

11. the control unit controls a first blur correction unit included in the lens device and a second blur correction unit included in an imaging device to which the lens device is attached; 11. The image blur correction control device according to claim 1, wherein the setting unit sets the responsiveness of at least one of the first image blur correction unit and the second image blur correction unit based on a resolution of the imaging system.

12. a control unit that controls a first blur correction unit included in the lens device and a second blur correction unit included in an imaging device to which the lens device is attached; an acquisition means for acquiring information indicating a shutter speed set in the imaging device; a setting unit that sets a response of at least one of the first motion compensation unit and the second motion compensation unit based on information indicating the shutter speed, the setting means sets a frequency band to be corrected by at least one of the first motion compensation means and the second motion compensation means based on information indicating the shutter speed, thereby setting the responsiveness; a vibration reduction control device which sets the frequency band so that a response of vibration reduction combined with the first vibration reduction means and the second vibration reduction means is higher when the shutter speed is a third value than when the shutter speed is a fourth value slower than the third value.

13. The control means a first method in which the first blur correction means and the second blur correction means correct a portion of the blur applied to the imaging device in accordance with a respective share of the blur; the first blur correction means and the second blur correction means are controllable by a second method in which, of the blur applied to the image pickup device, the first blur correction means corrects a blur in a first frequency band, and the second blur correction means corrects a blur in a second frequency band at least partially different from the first frequency band, The setting means is 13. The image stabilization control device according to claim 12, wherein the responsiveness is set by setting a sharing method selected from a plurality of sharing methods including at least the first method and the second method based on the information indicating the shutter speed.

14. the setting means sets the second mode when the shutter speed is equal to or greater than a predetermined value between the third value and the fourth value; 14. The image stabilization control device according to claim 13, wherein the first method is set when the shutter speed is slower than the predetermined value.

15. the setting means compares the responsiveness of the first motion compensation means with that of the second motion compensation means, and when it is determined that the responsiveness of the first motion compensation means is higher, sets the first frequency band to a higher frequency side than the second frequency band; 15. The image stabilization control device according to claim 13, wherein when it is determined that the second image stabilization means has a higher responsiveness, the second frequency band is set to a lower frequency side than the first frequency band.

16. the control means controls the first blur correction means and the second blur correction means such that, of the shake applied to the imaging device, the first blur correction means corrects a shake in a first frequency band and the second blur correction means corrects a shake in a second frequency band at least partially different from the first frequency band; The setting means is 13. The image stabilization control device according to claim 12, wherein the responsiveness is set by setting a boundary frequency between the first frequency band and the second frequency band.

17. 17. The image blur correction control device according to claim 12, wherein the setting means changes a responsiveness of at least one of the first image blur correction means and the second image blur correction means in accordance with the shutter speed.

18. An imaging device to which the lens device can be attached, A blur correction control device according to any one of claims 1 to 10, The imaging element; a second blur correction unit that corrects the effect of a blur applied to the imaging device on a captured image by moving the imaging element; The imaging apparatus according to claim 1, wherein the setting means sets the responsiveness of the second blur correction means.

19. An imaging device to which a lens device having a photographing optical system can be attached, a communication means for communicating with the lens device; an acquisition unit that acquires information indicating a resolving power of an imaging optical system of the lens device via the communication unit; An imaging element; a second blur correction unit that corrects the effect of a blur applied to the imaging device on a captured image by moving the imaging element; a setting unit that sets a responsiveness of the image blur correction unit based on the information indicating a resolving power of the photographing optical system acquired by the acquisition unit, The setting means is an imaging device, characterized in that the responsiveness of the second blur correction means is set so that the responsiveness is higher when a lens device equipped with a second photographing optical system having a higher resolution than a first photographing optical system is attached, compared to when a lens device equipped with a first photographing optical system is attached.

20. A lens device that can be attached to the imaging device, A blur correction control device according to any one of claims 1 to 10, The photographing optical system; a first blur correction unit that corrects an effect of a blur applied to the imaging device on a captured image by moving a part of an optical element that constitutes the imaging optical system, 4. A lens apparatus according to claim 3, wherein the setting means sets the responsiveness of the first image blur correction means based on the resolving power of the imaging system.

21. A lens device that can be attached to an imaging device having an imaging element, A communication means for communicating with the imaging device; an acquisition means for acquiring information indicating a resolution of an imaging element of the imaging device via the communication means; a first blur correction unit that corrects the effect of blurring of the imaging device on a captured image; a setting unit that sets a responsiveness of the first image blur correction unit based on information indicating a resolving power of the image sensor acquired by the acquisition unit, The setting means is A lens device characterized in that the responsiveness of the first blur correction means is set to be higher when an imaging device equipped with a second imaging element having a higher resolution than a first imaging element is attached than when an imaging device equipped with a first imaging element is attached.

Images