Anti-shake control device and method, imaging device, program and storage medium

Abstract

To perform image stabilization in accordance with lens characteristics.SOLUTION: An image stabilization control apparatus performs image stabilization by controlling first correction means, which drives a correction lens to correct an image blur, and second correction means, which drives an imaging element to correct the image blur. The image stabilization control apparatus acquires a shake amount, selects one of a plurality of control methods including a first control method and a second control method that control a ratio between the respective shake amounts to be corrected by the first correction means and the second correction means in accordance with whether an imaging optical system is compatible with the first control method, obtains a correction amount of one of the first correction means and the second correction means on the basis of the shake amount and the selected control method, and notifies means for obtaining a correction amount of the other one of the first correction means and the second correction means of the selected control method. The first control method is to perform an over-correction using the first correction means and an inverse-correction using the second correction means. The second control method is to correct the shake amount using a preset ratio.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an anti-vibration control device and method. [Background technology]

[0002] In recent years, imaging devices such as still cameras and video cameras are generally equipped with an image stabilization function. In particular, there are two types of optical image stabilization functions. One type realizes image stabilization by moving a correction lens dedicated mainly to image stabilization within a plane perpendicular to the optical axis (hereinafter referred to as "OIS: Optical Image Stabilizer"). The other type realizes image stabilization by moving an imaging element within a plane perpendicular to the optical axis (hereinafter referred to as "IBIS: In Body Image Stabilizer").

[0003] On the other hand, known directions of image blur include pitch blur, which is blur around a horizontal axis perpendicular to the optical axis, yaw blur, which is blur around a vertical axis perpendicular to the optical axis, and roll blur, which is blur around the optical axis, relative to the reference attitude of the imaging device.

[0004] Since IBIS moves the image sensor in a plane perpendicular to the optical axis, it can correct pitch shake and yaw shake, and can also move it in a rotational direction around the optical axis, so it can correct roll shake. On the other hand, OIS can correct pitch shake and yaw shake, but cannot correct roll shake even by rotating the correction lens.

[0005] Therefore, by simultaneously driving the OIS and IBIS (hereinafter referred to as "cooperative control"), it is possible to widen the vibration isolation range for pitch shake and yaw shake and also correct roll shake, compared to driving only one of them. When performing this cooperative control, the correction range can be maximized by appropriately setting the ratio between the amount of shake correction by the OIS and the amount of shake correction by the IBIS (see Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6410431 Summary of the Invention [Problem to be solved by the invention]

[0007] However, while the above-mentioned cooperative control improves image blur correction performance, residual blur correction at the periphery of the screen becomes noticeable. This is because the optimal amount of blur correction for image blur changes for each image height. Although the change in the amount of blur correction for each image height varies depending on the lens characteristics, the image stabilization operation by the image sensor, i.e., IBIS, is steeper.

[0008] Therefore, when the two types of image stabilization functions described above are driven simultaneously, setting the ratio of the image stabilization amount provided by the OIS to be greater than the ratio of the image stabilization amount provided by the IBIS will result in a more gradual change in the image stabilization amount for each image height, making the remaining image stabilization amount around the edges of the screen less noticeable.

[0009] Due to the characteristics described above, by controlling the ratio of the amount of shake correction provided by the OIS to a state exceeding 100% (hereinafter referred to as "overcorrection control"), and controlling the ratio of the amount of shake correction provided by the IBIS in a direction that cancels the amount of OIS that exceeds 100%, i.e., by controlling it to a negative state (hereinafter referred to as "inverse correction control"), it is possible to minimize the remaining shake correction amount on the periphery of the screen. In this way, cooperative control that prioritizes stabilization of peripheral image quality by performing overcorrection control using the OIS and inverse correction control using the IBIS is hereinafter referred to as a "peripheral blur correction method."

[0010] On the other hand, depending on the combination of the above-mentioned cooperative control and the shutter method, image quality may be degraded. Specifically, in an imaging device equipped with a mechanical shutter, shooting may be performed using a method in which the front curtain operation is performed by an electronic shutter (reset scanning of the image sensor) and the rear curtain operation is performed by the mechanical shutter (hereinafter referred to as the "electronic front curtain shutter method"). In particular, when exposure is performed with a high-speed shutter while correcting roll shake, uneven exposure becomes significantly noticeable when the image sensor is tilted relative to the mechanical shutter. Furthermore, uneven exposure becomes noticeable not only due to the roll shake correction operation, but also due to the influence of the diagonal difference in light and dark around the screen (hereinafter referred to as "shading") that accompanies the pitch shake and yaw shake correction operations.

[0011] Therefore, when shooting using the electronic front-curtain shutter method, degradation in image quality can be suppressed by stopping image stabilization immediately before shooting and then returning the image sensor to its reference state (center position and a state in which the travel direction of the electronic shutter and the travel direction of the mechanical shutter are the same).

[0012] However, when image capture is performed using the electronic front-curtain shutter method, if blur correction using the peripheral blur correction method is performed, the following problem occurs. As mentioned above, in order to avoid uneven exposure when using the electronic front-curtain shutter method, it is necessary to return the image sensor to its center position before shooting begins. By returning the image sensor to its center position, the proportion of image blur correction provided by the IBIS becomes 0%. As a result, the amount of image blur correction provided by the OIS is changed from an overcorrection control state to 100%.

[0013] This ratio change in the image blur correction amount is steeper than when the image sensor is returned to the center position during cooperative control based on a ratio less than 100% calculated from the movable ranges of the compensation lens and the image sensor. Therefore, there is a problem in that the movement of the compensation lens and the image sensor accompanying this steep ratio change is transmitted to the photographer in the form of vibration due to the law of action and reaction, resulting in a poor usability of the imaging device or causing blur.

[0014] The present invention has been made in consideration of the above problems, and has an object to perform cooperative control in accordance with the characteristics of the lenses.

[0015] Another object is to perform coordinated control suited to the lens characteristics as well as the photographing conditions. [Means for solving the problem]

[0016] In order to achieve the above object, the image stabilization control device of the present invention performs image stabilization by controlling a first correction means that corrects image shake by driving a correction lens included in an imaging optical system in a direction perpendicular to an optical axis, and a second correction means that corrects image shake by driving an imaging element that photoelectrically converts light incident via the imaging optical system and outputs an image signal, in a direction perpendicular to the optical axis, and the image stabilization control device of the present invention performs image stabilization by controlling the first correction means, the second correction means, the image stabilization control device including: an acquisition means that acquires an amount of shake from a detection means; a selection means that selects one of a plurality of control methods including a first control method and a second control method, which controls a ratio between the amount of shake corrected by the first correction means and the amount of shake corrected by the second correction means; and a control means that selects the first correction means and the second correction means based on the amount of shake and the control method selected by the selection means. and a notification means for notifying a means for determining a correction amount of the other of the first correction means and the second correction means of the control method selected by the selection means, wherein the first control method is a method for performing overcorrection that exceeds the amount of shake and performs inverse correction that cancels out the overcorrection by the second correction means within a range in which the shake amount can be corrected, within a range in which the first correction means can be driven, and the second control method is a method for correcting the amount of shake by using a predetermined ratio between the first correction means and the second correction means over a range in which the shake amount can be corrected, and the selection means makes a selection depending on whether the imaging optical system is compatible with the first control method. Effect of the Invention

[0017] According to one aspect of the present invention, cooperative control can be performed in accordance with the characteristics of the lenses.

[0018] Furthermore, according to another aspect, it is possible to perform cooperative control suited to the shooting conditions as well as the lens characteristics. [Brief description of the drawings]

[0019] [Figure 1] 1 is a block diagram showing an example of the arrangement of a digital camera according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram showing a detailed configuration of an image stabilization system according to the embodiment. [Diagram 3] 5A to 5C are schematic diagrams for explaining features of each method of cooperative control in the embodiment. [Figure 4] 5 is a flowchart of camera side image blur correction control in the first embodiment. [Diagram 5] 5 is a flowchart of lens side image blur correction control in the first embodiment. [Figure 6] FIG. 1 is a schematic diagram illustrating a problem that occurs when an IBIS image sensor returns to its center position. [Figure 7] 10 is a flowchart of camera side image blur correction control in the second embodiment. [Figure 8] 13 is a flowchart of camera side image blur correction control in the third embodiment. [Figure 9] 13 is a flowchart of camera side image blur correction control in the third embodiment. [Figure 10] 13A and 13B are schematic diagrams illustrating vibration reduction control when still images are continuously captured by the electronic front-curtain shutter method according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, the embodiments will be described in detail with reference to the attached drawings. Note that the following embodiments do not limit the invention according to the claims. Although the 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 attached drawings, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0021] FIG. 1 is a block diagram showing an example of the configuration of a digital camera, which is an embodiment of an imaging apparatus of the present invention.

[0022] In this embodiment, the present invention will be described with respect to a case where it is implemented in a lens-interchangeable digital camera, but any electronic device having a camera function may be used, and in addition to cameras such as digital cameras and digital video cameras, it may also be a camera-equipped mobile phone, a camera-equipped computer, a game machine, etc. Also, the lens may be configured integrally with the camera body.

[0023] First, the configuration of the lens unit 200 will be described. The lens unit 200 includes an imaging optical system 150 including a zoom lens 101 , an image blur correction lens 102 , a focus lens 103 , and an aperture 104 , and a lens side control system 160 that controls the imaging optical system 150 .

[0024] The zoom lens 101 moves in the optical axis direction to optically change the focal length of the imaging optical system 150, thereby changing the imaging angle of view. The image blur correction lens 102 moves in a direction perpendicular to the optical axis to optically correct image blur caused by shaking of the imaging device. The focus lens 103 moves in the optical axis direction to optically adjust the focus position. The aperture 104 is used to adjust the amount of light entering the camera body 100.

[0025] In the lens side control system 160, the zoom lens control unit 127 receives a zoom operation instruction from the operation unit 114 provided in the camera body 100 via the lens side communication unit 128, and drives the zoom lens 101 via the zoom lens driving unit 124. This changes the angle of view (focal length) of the lens unit 200. The focus lens driving unit 121 drives the focus lens 103 based on a drive instruction for the focus lens 103 received from the camera body 100 via the lens side communication unit 128 . The aperture driver 120 controls the aperture 104 based on the aperture value received from the camera body 100 via the lens side communication unit 128 .

[0026] The lens side shake detection unit 125 detects shake of the lens unit 200 and outputs information related to the detected shake. Generally, a gyro sensor is used as a sensor component for detecting shake, and detects the angular velocity of the shake and outputs it to the lens side vibration isolation control unit 126. The lens vibration reduction position detection unit 123 detects the position of the image blur correction lens 102 in a direction perpendicular to the optical axis, and outputs the detected position information to the lens side vibration reduction control unit 126 . A camera information management unit 129 on the lens unit 200 side holds and manages setting information of the camera body 100 and information on the current position and driving limit of the image sensor 106 .

[0027] The lens side vibration reduction control unit 126 determines the amount of vibration reduction and the correction direction for suppressing vibration, based on the amount of vibration detected by the lens side vibration detection unit 125, position information of the image vibration correction lens 102 detected by the lens vibration reduction position detection unit 123, and information managed by the camera information management unit 129. Then, the lens side vibration reduction control unit 126 controls the lens vibration reduction driving unit 122 based on the determined amount of vibration reduction and correction direction, and drives the image vibration correction lens 102 by the amount of vibration reduction in the image vibration correction direction.

[0028] Next, the configuration of camera body 100 will be described. The shutter 105 is a mechanical focal plane shutter and includes a front curtain and a rear curtain. A shutter drive unit 136 drives the shutter 105. The front curtain and the rear curtain are fixed at a position (exposure position) retracted from the optical path during video capture, and allow light incident via the lens unit 200 to pass through, forming an image on the image sensor 106.

[0029] During still image shooting, the front curtain performs exposure travel to move from a light-shielding position on the optical path to an exposure position while the rear curtain is held at the exposure position, thereby allowing light to pass through. Then, after a preset exposure time (shutter speed) has elapsed since the front curtain was moved, the rear curtain performs light-shielding travel to move from the exposure position to the light-shielding position, completing an exposure operation for one shot. Hereinafter, the exposure operation in which the exposure time is adjusted using the front and rear curtains of the shutter 105 described above will be referred to as the "mechanical shutter method." In addition to the mechanical shutter method, there is also a shutter method in which the exposure time is controlled by electrical reset scanning of the image sensor 106 (electronic front curtain) and reading out a signal from the image sensor 106 (electronic rear curtain), hereinafter referred to as the "electronic shutter method." As described above, there is an electronic front curtain shutter method in which the exposure time is controlled by combining electrical reset scanning (electronic front curtain) of the image sensor 106 and the travel of the rear curtain of the shutter 105.

[0030] Light passing through the imaging optical system 150 and the shutter 105 is received by an imaging element 106 using a CCD (charge-coupled device) or a CMOS (complementary metal-oxide semiconductor) sensor, and photoelectrically converted into an electrical signal. Note that the imaging element 106 in this embodiment has a function of optically correcting image blur by moving in a direction perpendicular to the optical axis.

[0031] The AD converter 107 performs noise removal processing, gain adjustment processing, and AD conversion processing on the electrical signal (image signal) read out from the image sensor 106 to generate image data. The timing generator 108 controls the drive timing of the image sensor 106 and the drive timing of the AD converter 107 according to instructions from the camera control unit 143. The image processing circuit 109 performs pixel interpolation processing, color conversion processing, etc. on the image data output from the AD converter 107, and then sends the processed image data to the internal memory 110.

[0032] The display unit 111 displays image data stored in the internal memory 110, shooting information, and the like. The compression / decompression processing unit 112 performs compression processing on the image data stored in the internal memory 110 in accordance with the image format, and stores the compressed image data in the storage memory 113. In addition, the compression / decompression processing unit 112 reads compressed image data from the storage memory 113, performs decompression processing on the image data, and stores the decompressed image data in the internal memory 110. The storage memory 113 stores various data such as parameters in addition to image data. The operation unit 114 is a user interface for the user to input various instructions including zoom operation instructions and shooting instructions, as well as to perform various menu operations and mode switching operations.

[0033] In the camera-side control system 115, the camera control unit 143 is composed of a calculation unit such as a CPU (Central Processing Unit), and controls the entire imaging device by executing various control programs stored in the internal memory 110 in response to user operations via the operation unit 114. The control programs include, for example, programs for performing zoom control, image blur correction control, automatic exposure control, automatic focus adjustment control, processing for detecting the face of a subject, etc. In the case of a lens-interchangeable camera, the camera-side communication unit 135 and the lens-side communication unit 128 control the transmission of information between the camera body 100 and the lens unit 200.

[0034] The luminance signal detector 142 detects the luminance of the subject and the entire image from the image data output from the AD converter 107 . The exposure control unit 139 calculates the exposure value (aperture value and exposure time) based on the luminance information obtained by the luminance signal detection unit 142, and outputs the aperture value to the aperture drive unit 120 of the lens unit 200 via the camera side communication unit 135, and outputs the exposure time to the shutter drive unit 136. The exposure control unit 139 also simultaneously performs control for the AD converter 107 to perform gain adjustment processing on the imaging signal read out from the imaging element 106, based on the sensitivity set automatically according to the user's operation via the operation unit 114 or the luminance. This performs automatic exposure control (AE control).

[0035] The evaluation value calculation unit 141 extracts a specific frequency component from the luminance information obtained by the luminance signal detection unit 142, and calculates a contrast evaluation value based on the extracted frequency component. The focus lens control unit 140 issues a command to drive the focus lens 103 by a predetermined drive amount over a predetermined range, and acquires a contrast evaluation value that is a calculation result of the evaluation value calculation unit 141 at each focus lens position. Then, based on the focus lens position where the change curve of the contrast evaluation value reaches its peak, the focus lens control unit 140 calculates a defocus amount by the contrast AF method, and transmits the defocus amount to the focus lens driving unit 121 of the lens unit 200 via the camera side communication unit 135. The focus lens driving unit 121 drives the focus lens 103 by the defocus amount, thereby performing automatic focusing control (AF control) in which a light beam is focused on the imaging surface of the imaging element 106. Note that, although the contrast AF method has been described here, a phase difference AF method may be used. The phase difference AF method is well known, and therefore a description thereof will be omitted here.

[0036] The camera-side shake detection unit 134 detects shake of the camera body 100 and outputs information related to the detected shake. As with the lens-side shake detection unit 125, a gyro sensor is generally used as a sensor component for detecting shake vibrations, and detects the angular velocity of the shake and outputs it to the camera-side vibration isolation control unit 133. The image sensor vibration isolation position detection section 132 detects the position of the image sensor 106 in a direction perpendicular to the optical axis, and outputs the detected position information to the camera-side vibration isolation control section 133 . A lens information management unit 137 holds and manages, on the camera body 100 side, optical characteristic information of the image blur correction lens 102, information on the current position, and information on the driving limit.

[0037] The camera-side vibration reduction control unit 133 determines the amount of shake correction and the correction direction for suppressing shake, based on the amount of shake detected by the camera-side vibration detection unit 134, position information of the image sensor 106 detected by the image sensor vibration reduction position detection unit 132, and information managed by the lens information management unit 137. Then, the camera-side vibration reduction control unit 133 controls the image sensor vibration reduction drive unit 130 based on the determined amount of shake correction and correction direction, and drives the image sensor 106 by the amount of shake correction in the image shake correction direction.

[0038] The image synthesis processing unit 131 converts the image blur correction amount calculated by the camera-side vibration reduction control unit 133 into the image shift amount between images by multiplying the amount by an appropriate coefficient. By appropriately controlling the scanning range of the next image to be captured based on this image shift amount, it is possible to correct camera shake occurring between images. By continuously performing this operation, electronic vibration reduction that suppresses image degradation due to camera shake is performed.

[0039] FIG. 2 is a block diagram showing the detailed configuration of an image shake correction system (OIS) on the lens unit 200 side and an image shake correction system (IBIS) on the camera body 100 side.

[0040] First, the image blur correction system (IBIS) on the camera body 100 side will be described. The angular velocity of the shake detected by the camera-side shake detection unit 134 is integrated by a camera-side integration unit 161 of the camera-side vibration isolation control unit 133 and converted into a shake angle. A camera-side shake correction amount calculation unit 162 performs a calculation to determine a shake correction amount that cancels the shake angle, taking into account the frequency band of the shake angle and the range in which the image sensor 106 can be driven.

[0041] The camera-side control method determination unit 166 determines which method of cooperative control of the IBIS and the OIS to select (any of the peripheral blur correction method, cooperative control method 1, and cooperative control method 2). Details of each method and details of the process performed by the camera-side control method determination unit 166 will be described later. Camera side ratio accumulator 163 accumulates the ratio of the shake correction amount provided by the IBIS to the shake correction amount found by camera side shake correction amount calculator 162, based on the cooperative control method selected by camera side control method determiner 166.

[0042] If the target position to which the image sensor 106 is driven based on the amount of shake correction exceeds the driving limit of the image sensor 106, the camera-side driving range limiter 164 limits the amount of shake correction. The camera-side PID control unit 165 performs feedback control using the current position of the image sensor 106 acquired by the image sensor vibration isolation position detection unit 132 so that the image sensor 106 follows the target position to which the image sensor 106 is driven. Note that since PID control is a common technique, details will be omitted. Also, the feedback control method is not limited to PID control.

[0043] Furthermore, the camera-side image stabilization control unit 133 calculates the amount of image shift between the images, and instructs the image synthesis processing unit 131 to perform electronic image stabilization control.

[0044] Next, the image stabilization system (OIS) on the lens unit 200 side will be described. The angular velocity of the shake detected by the lens-side shake detection unit 125 is integrated by a lens-side integration unit 151 of the lens-side image stabilization control unit 126 and converted into a shake angle. A lens-side shake correction amount calculation unit 152 performs a calculation to determine the shake correction amount that cancels the shake angle, taking into account the frequency band of the shake angle and the range in which the image shake correction lens 102 can be driven.

[0045] Lens side ratio accumulation unit 153 accumulates the ratio of the amount of shake correction performed by the OIS to the amount of shake correction calculated by lens side shake correction amount calculation unit 152, based on the method of cooperative control of the IBIS and the OIS selected by camera side control method determination unit 166.

[0046] A lens side driving range limiter 154 limits the amount of blur correction when the target position to which the image blur correction lens 102 is driven based on the amount of blur correction exceeds the driving limit of the image blur correction lens 102 . The image blur correction lens PID control unit 155 performs feedback control using the current position of the image blur correction lens 102 acquired by the lens vibration isolation position detection unit 123 so that the image blur correction lens 102 follows the target position to which the image blur correction lens 102 is driven. Note that PID control is a common technique, so details are omitted. Also, the feedback control method is not limited to PID control.

[0047] Next, the types of cooperative control for simultaneously driving the OIS and IBIS in this embodiment and the characteristics of image blur correction by each cooperative control will be described with reference to Fig. 3. In each graph shown in Fig. 3, the X-axis represents the amount of shake within the range correctable by the OIS and IBIS, and the Y-axis represents the amount of shake correction.

[0048] Of the three control methods shown in FIG. 3, cooperative control methods 1 and 2 are methods that perform control so that the direction of relative movement between the subject image generated by the OIS and the image sensor coincides with the direction of relative movement between the subject image generated by the IBIS and the image sensor. In cooperative control methods 1 and 2, the ratio of the shake correction amount of the OIS and IBIS is less than 100% and is calculated from the movable range of the OIS and IBIS. In other words, neither the OIS correction amount nor the IBIS correction amount exceeds the correction amount corresponding to the detected shake (the correction amount for correcting the detected shake). On the other hand, in the peripheral blur correction method, the ratio of the blur correction amount provided by the OIS is controlled to a state exceeding 100% (hereinafter referred to as "overcorrection control"). Then, the ratio of the blur correction amount provided by the IBIS is controlled in a direction that cancels the amount by which the OIS exceeds 100%, i.e., to a negative state (hereinafter referred to as "reverse correction control"), thereby correcting image blur. In other words, the correction amount provided by the OIS exceeds the correction amount corresponding to the detected blur, and the correction amount provided by the IBIS has an opposite sign (reverse drive direction) to the correction amount corresponding to the detected blur. Details will be explained below.

[0049] In the image stabilization by the cooperative control method 1, the amount of image stabilization is corrected by an amount equal to the amount of shake, so the relationship between the amount of shake and the amount of image stabilization is Y=X. In addition, the ratio between the amount of image stabilization by the OIS and the amount of image stabilization by the IBIS is expressed. In the cooperative control method 1, the amount of image stabilization by the OIS and the amount of image stabilization by the IBIS are increased while maintaining a constant ratio until the maximum movable range of the image stabilization lens 102 driven by the OIS is reached. This constant ratio is determined by the ratio between the maximum movable range of the image stabilization lens 102 driven by the OIS and the maximum movable range of the image sensor 106 driven by the IBIS. For example, if the maximum movable range of the image stabilization lens 102 and the image sensor 106 are the same, the constant ratio is 50%. Note that the ratio of the maximum movable ranges does not refer to the ratio of the distances over which the image stabilization lens 102 or the image sensor 106 can actually be driven, but rather to the ratio of the distances over which relative movement can be caused between the subject image and the image plane of the image sensor by driving the image stabilization lens 102 or the image sensor 106.

[0050] In blur correction using the peripheral blur correction method, overcorrection control is performed so that the amount of blur correction by the OIS exceeds the amount of shake, up to the maximum movable range of the image blur correction lens 102 driven by the OIS. On the other hand, inverse correction control is performed so that the amount of blur correction by the IBIS is set to an amount that cancels the amount of blur correction by the OIS that exceeds the amount of shake.

[0051] As mentioned above, the optimal amount of image blur correction for image shake changes for each image height. The change in the amount of image blur correction for each image height varies depending on the lens characteristics, but is steeper with IBIS. Therefore, when the two types of image blur correction functions mentioned above are operated simultaneously, making the ratio of the amount of image blur correction by OIS larger than the ratio of the amount of image blur correction by IBIS will make the change in the amount of image blur correction for each image height more gradual, making the remaining image blur correction at the edges of the screen less noticeable. Therefore, in the peripheral blur correction method, OIS performs overcorrection control, while IBIS performs inverse correction control to minimize the remaining blur correction at the periphery of the screen. Inverse correction control moves the image sensor in the same direction as the relative movement between the subject image and the imaging surface of the image sensor that occurs due to blur, so inverse correction control is a control that would result in greater blur without overcorrection by OIS. In particular, if the section in which the image blur correction lens 102 is moved so that the amount of blur correction by the OIS is at its maximum ratio is taken as section A, and the remaining section up to the maximum movable range of the image blur correction lens 102 is taken as section B, section A is the section in which the OIS and the IBIS perform overcorrection and reverse correction, respectively, and section B is the section in which the amount of blur correction in excess of the overcorrection and the amount of blur correction in reverse correction gradually decrease.

[0052] Furthermore, if the section of the shake amount after the maximum movable range of the image shake correction lens 102 is exceeded is called section C, then in section C, no further image shake correction can be performed by the OIS, so only the amount of shake correction by the IBIS increases. Therefore, in section C, the ratio of the amount of shake correction by the OIS to the amount of shake correction by the IBIS is not constant, but fluctuates.

[0053] Furthermore, the peripheral blur correction method imposes a significantly larger computational load on the ratio than cooperative control method 1, so in order to suppress the computational load, the movable range of the image sensor 106 used in the IBIS is limited. As a result, with the peripheral blur correction method, the vibration reduction range when the OIS and IBIS are driven simultaneously is narrower than with cooperative control method 1. Therefore, cooperative control method 1 has an advantage in terms of vibration reduction performance.

[0054] Cooperative control method 2 is based on the same basic concept as cooperative control method 1, but takes into account the optical characteristics of the lens and allocates a particularly high proportion of the image blur correction amount to the OIS. This is because the amount of image blur remaining on the periphery of the image can be reduced by allocating a large amount of image blur correction amount to the OIS, which has a smaller change in image blur correction amount for each image height.

[0055] If the section D is the section in which the amount of shake allocated mostly to the OIS is up to the maximum movable range of the image shake correction lens 102 driven by the OIS, then in section E beyond section D, the OIS cannot perform any more image shake correction, and only the amount of shake correction by the IBIS increases. Therefore, in section E, the ratio of the amount of shake correction by the OIS and the amount of shake correction by the IBIS is not constant, but fluctuates.

[0056] <First embodiment> A first embodiment of the present invention will now be described. FIGS. 4 and 5 are flowcharts showing the flow of image blur correction control performed in the imaging apparatus having the above-described configuration in the first embodiment. FIG. 4 is a flowchart of camera-side image blur correction control, and FIG. 5 is a flowchart of lens-side image blur correction control.

[0057] First, the camera side image blur correction control will be described with reference to the flowchart in FIG. When camera-side image blur correction control is started, in S101, the camera-side control method determination unit 166 determines whether or not the lens unit 200 is a lens that supports a peripheral blur correction method, based on information acquired by initialization communication when the lens unit 200 is attached to the camera body 100.

[0058] If the lens unit 200 supports the peripheral blur correction method, the process proceeds to S102, and the camera-side control method determination unit 166 sets the peripheral blur correction method. This causes the camera body 100 to start preparations for inverse correction using IBIS. On the other hand, if the lens unit 200 does not support the peripheral blur correction method, the process proceeds to S103, and cooperative control method 1 is set.

[0059] In S104, lens information is received from the lens unit 200. Here, the lens information includes the maximum movable range of the OIS image stabilization lens 102, the maximum ratio of the OIS shake correction amount, the range of the shake amount for moving the image stabilization lens 102 at the maximum ratio, and the current position of the image stabilization lens 102. These are required for ratio calculation when performing inverse correction by the IBIS.

[0060] In S105, the camera information and the control method of cooperative control set by the camera-side control method determination unit 166 in the processes of S101 to S103 are transmitted to the lens unit 200. Here, the camera information includes the maximum movable range of the IBIS image sensor 106 and the current position of the image sensor 106. These are required for ratio calculation when the lens unit 200 performs overcorrection by OIS.

[0061] In S106, it is determined whether or not to start still image shooting. If still image shooting is to be started, in S107, the amount of shake is obtained from the camera-side shake detection unit 134. The unit of the amount of shake at this time is angular velocity. Then, in S108, the amount of shake is integrated by the camera-side integration unit 161, and the angular velocity is converted into an angle (shake angle).

[0062] In S109, camera-side shake correction amount calculation unit 162 calculates a shake correction amount that cancels the shake angle, taking into consideration the frequency band of the shake angle and the range in which image sensor 106 can be driven. Then, in S110, camera-side ratio accumulator 163 accumulates the calculated shake correction amount by the ratio calculated based on the control method of cooperative control set by camera-side control method determination unit 166. In the case of the peripheral shake correction method, although it depends on the magnitude of the shake angle, IBIS becomes a negative ratio in the range where the detected shake angle is less than a predetermined value (range A to B in FIG. 3).

[0063] In S111, if the image blur correction amount exceeds the drivable range of the image sensor 106, the camera side driving range limiter 164 performs processing to limit the image sensor 106 to the drivable range. Then, in S112, the camera side PID controller 165 performs feedback control of the image sensor 106.

[0064] On the other hand, if still image shooting is not started in S106, feedback control is performed in S113 to hold the image sensor 106 at the central position. After the feedback control in S112 or S113 ends, the camera side image blur correction control ends.

[0065] Next, the lens side image blur correction control will be described with reference to the flowchart in FIG. First, in S201, lens information is transmitted to the camera body 100, and in S202, camera information and the control method for cooperative control set by the camera-side control method determination unit 166 by the processes of S101 to S103 described above are received from the camera body 100. Then, depending on the control method of the cooperative control acquired in S203, either the peripheral blur correction method or the cooperative control method 1 is set in S204 or S205.

[0066] In S206, the amount of shake is acquired by the lens-side shake detection unit 125. The unit of the amount of shake at this time is angular velocity. Then, in S207, the amount of shake is integrated by the lens-side integration unit 151, and the angular velocity is converted into an angle (shake angle).

[0067] In S208, the lens side blur correction amount calculation unit 152 calculates a blur correction amount that cancels the blur angle, taking into consideration the frequency band of the blur angle and the range in which the image blur correction lens 102 can be driven. Then, in S209, the lens side ratio accumulating unit 153 accumulates the calculated ratio based on the control method of the cooperative control set in S204 or S205 for the calculated blur correction amount. In the case of the peripheral blur correction method, although it depends on the magnitude of the blur angle, the correction by the OIS will be a ratio exceeding 100% of the correction amount in the range where the detected blur angle is less than a predetermined value (range A to B in FIG. 3).

[0068] In S210, if the image blur correction amount exceeds the driveable range of the image blur correction lens 102, the lens side driving range limiter 154 performs processing to limit the image blur correction lens 102 to the driveable range. Then, in S211, the image blur correction lens PID controller 155 performs feedback control of the image blur correction lens 102, and the lens side image blur correction control ends.

[0069] In addition, in order to make the most of the IBIS, which tends to have a narrow range of motion during cooperative control, at the time of exposure, the OIS will not remain in the center position unless the photographer intentionally turns off the vibration reduction function. Therefore, in lens-side image blur correction control, there is no branching process due to the start of still image capture, such as S106 in Figure 4 in camera-side image blur correction control.

[0070] On the other hand, in the camera-side image blur correction control, before still image shooting starts in S106, the image sensor 106 is held in the center position in S113. This makes it possible to make the most of the blur correction range by the IBIS when still image shooting starts, and also eliminates the need to return the image sensor 106 to the center position when still image shooting starts, thereby eliminating vibrations caused by movement of the image sensor 106.

[0071] As described above, according to the first embodiment, it is possible to perform coordinated control of image blur correction that is compatible with the lens units.

[0072] In the above example, a case has been described in which the control method for cooperative control is determined in camera body 100, but the present invention is not limited to this, and the control method may be set in lens unit 200. In that case, a control method determination section equivalent to camera-side control method determination section 166 may be provided in lens unit 200, which performs the processes of S101 to S103 in Fig. 4 and notifies camera body 100 of the setting contents. Lens unit 200 recognizes whether it is a lens that supports the peripheral blur correction method or not, and therefore can determine this by itself when the imaging device is started up.

[0073] <Second embodiment> Next, a second embodiment of the present invention will be described below. In the second embodiment, a case will be described in which a control method for cooperative control is selected in accordance with the shutter method and the shutter time.

[0074] In the electronic front curtain shutter method, when the shutter speed is high (for example, exposure time shorter than 1 / 1000 seconds), the slit width during slit travel is small. Therefore, if an image is taken without the image sensor 106 returning to the reference state (no tilt at the center position) in the pitch, yaw, and roll directions, uneven exposure occurs.

[0075] Furthermore, when the shutter speed is fast, the effect of camera shake is minor, so performing anti-shake control to reduce exposure unevenness can produce an image that looks less strange. Since exposure unevenness is mainly caused by the arrangement of the image sensor 106, in cooperative control of the OIS and IBIS, the IBIS is affected by the shutter method and shooting speed.

[0076] As described above, when using the electronic front curtain shutter method, depending on the exposure time, it may be necessary to return the IBIS image sensor 106 to the reference state described above, and when returning to the center position, a steep change occurs in the ratio of the blur correction amounts of the OIS and the IBIS. This results in problems such as a poor usability of the imaging device due to vibration being felt in the hand, or a cause of blur.

[0077] FIG. 6 is a schematic diagram for explaining the adverse effects of the operation of returning the IBIS imaging element 106 to the center position for each of the cooperative control methods explained in FIG. In the example of cooperative control method 1 shown in FIG. 6, when the image sensor 106 moves to the central position using the IBIS, the ratio of the IBIS to the image blur correction amount changes from 50% to 0%, and the ratio of the OIS changes from 50% to 100%.

[0078] In the example of the peripheral blur correction method, in the range where the OIS has the greatest overcorrection, the IBIS makes a correspondingly large reverse correction. Therefore, with respect to the amount of blur correction, the IBIS ratio changes from -100% to 0%, and the OIS ratio changes from 200% to 100%. In this way, there are more significant changes compared to cooperative control method 1.

[0079] In the example of cooperative control method 2, the OIS is driven preferentially, so that, within the range up to the limit of the driving range of the image blur correction lens 102, the ratio of the IBIS to the amount of blur correction changes from 10% to 0%, and the ratio of the OIS changes from 110% to 100%.

[0080] As described above, particularly in the case of a peripheral blur correction method, when the electronic front-curtain shutter method is used at high shutter speeds, the operation of returning the image sensor 106 to the center in an attempt to reduce uneven exposure may degrade the usability of the imaging device or may cause blurring. Therefore, in the second embodiment, the control method of the cooperative control is switched depending on the shutter method and the shutter time.

[0081] FIG. 7 is a flowchart of camera side image blur correction control in the second embodiment. Fig. 7 shows the camera side image blur correction control (IBIS) in the second embodiment, in which the processes of S301 and S302 are added to the process of Fig. 4. The other processes are the same as those in Fig. 4, so the same S symbols are used and the explanation is omitted.

[0082] If it is determined in S101 that the lens unit 200 supports the peripheral blur correction method, it is determined in S301 whether the shutter method is the electronic front curtain shutter method. If the shutter method is not the electronic front curtain shutter method, that is, if the shutter method is the mechanical shutter method or the electronic shutter method, there is no concern that uneven exposure will occur depending on the shutter time even if the peripheral blur correction method is used, so the peripheral blur correction method is set in S102.

[0083] On the other hand, in the case of the electronic front curtain shutter method, the process proceeds to S302 to determine whether the shutter time is longer than a predetermined threshold value Th1. It is advisable to set a shutter time at which exposure unevenness becomes noticeable as the threshold value Th1. If the shutter time is longer than the predetermined threshold value Th1, the exposure unevenness will not be noticeable even if it occurs, so the process proceeds to S102 to set the peripheral blur correction method. If the shutter time is equal to or less than the predetermined threshold value Th1, the exposure unevenness may occur with the peripheral blur correction method, so the process proceeds to S103 to set the cooperative control method 1.

[0084] It should be noted that the lens side image blur correction control is similar to that described with reference to FIG. 5, and therefore the description thereof will be omitted.

[0085] As described above, according to the second embodiment, in addition to the effects of the first embodiment, by switching the cooperative control method depending on the shutter type and shutter time, it is possible to perform cooperative control of image stabilization that is more suited to the shooting conditions.

[0086] In the above example, a case has been described in which the control method for image stabilization is determined in camera body 100, but the present invention is not limited to this, and the setting may be performed in lens unit 200. In that case, a control method determination section equivalent to camera-side control method determination section 166 may be provided in lens unit 200, which performs the processes of S101 to S103 in FIG.

[0087] <Third embodiment> Next, a third embodiment of the present invention will be described below. In the third embodiment, a case where still images are continuously captured will be described.

[0088] As described above, in the case of the electronic front curtain shutter method, depending on the exposure time, it may be necessary to hold the IBIS image sensor 106 in the center position. In particular, in the continuous shooting mode of still images, if it is necessary to perform an operation to return the image sensor 106 to the center position between frames, a sharp change occurs in the ratio of the blur correction amount of the OIS and the IBIS when returning to the center position. As a result, there is a problem that the feeling of use of the imaging device becomes poor due to vibration being felt in the hand, or that it may cause blurring.

[0089] 8 and 9 show the camera side image blur correction control in the third embodiment, which is a control in consideration of the above-mentioned problem. In Fig. 8 and Fig. 9, the same reference numerals are given to the same processes as those in Fig. 4 and Fig. 7, and the description is omitted as appropriate.

[0090] If it is determined in S101 that the lens unit 200 supports the peripheral blur correction method, then in S301 it is determined whether the shutter method is the electronic front curtain shutter method or not. If it is not the electronic front curtain shutter method, that is, if it is the mechanical shutter method or the electronic shutter method, the process proceeds to S304, where it is determined whether the focal length is equal to or less than a predetermined value.

[0091] When the focal length is equal to or less than a predetermined value, that is, on the wide side, diagonal differences (shading) at the periphery of the screen caused by driving the image sensor 106 become noticeable, so the process proceeds to S102 and a peripheral blur correction method is set. On the other hand, when the focal length is longer than the predetermined value, that is, on the telephoto side, the diagonal difference (shading) at the periphery of the screen tends to be less noticeable, so the process proceeds to S103 and cooperative control method 1 is set.

[0092] On the other hand, if it is determined in S301 that the shutter method is the electronic front curtain shutter method, it is determined in S303 whether or not the mode is a continuous shooting mode. If the continuous shooting mode is selected, the process proceeds to S305, where it is determined whether the shutter speed is longer than a predetermined threshold Th1. If the shutter speed is equal to or shorter than the predetermined threshold Th1, the process proceeds to S307, where only the OIS is driven to perform image blur correction, and the IBIS is set to the reference state (center position). By controlling in this way, it is possible to prevent uneven exposure. Since there is no coordinated control, the image blur prevention effect is weakened, but since the impact of image blur is small at high speed shutter speeds, the reduction in the image blur prevention effect is limited.

[0093] On the other hand, if the shutter time is longer than the predetermined threshold value Th1, cooperative control method 2 is set in S306. This is because, in the case of the electronic front curtain shutter method, depending on the next exposure time during continuous shooting, it is necessary to return the image sensor 106 to the center position before the start of exposure between frames, as set in S307. As described above, if a steep fluctuation in ratio occurs when returning to the center position, there is a problem that vibrations are felt in the hand, so cooperative control method 2 is set to shorten the distance to return to the center position.

[0094] On the other hand, if it is determined in S303 that the continuous shooting mode is not selected, that is, if the single shooting mode is selected, the process proceeds to S302, where it is determined whether the shutter time is longer than a predetermined threshold value Th1. If the shutter time is longer than a predetermined threshold value Th1, the process proceeds to S304 to perform control according to the focal length described above. If the shutter time is equal to or less than the predetermined threshold value Th1, the process proceeds to S103 to set the cooperative control method 1 since there is a possibility that exposure unevenness may occur in the peripheral blur correction method.

[0095] Once the image stabilization control method is set in any one of S102, S103, S306, and S307, the process proceeds to S104.

[0096] 9, it is determined whether or not the continuous shooting mode is selected. If the continuous shooting mode is not selected, the process proceeds to S106, and if the continuous shooting mode is selected, the process proceeds to S309. In S309, it is determined whether the shutter type is the electronic front-curtain shutter type. If it is not the electronic front-curtain shutter type, that is, if it is the mechanical shutter type or the electronic shutter type, the process proceeds to S106, and if it is the electronic front-curtain shutter type, the process proceeds to S310.

[0097] In S310, it is determined whether or not continuous shooting has not yet started, and if not, the process proceeds to S106, and if it has already started, the process proceeds to S311 to determine whether or not to start shooting the next still image. If shooting of the next still image is to be started, the process proceeds to S107.

[0098] On the other hand, if shooting of the next still image is not to start, that is, if there is an interval between frames, in S312, image stabilization is performed using only the OIS with the IBIS image sensor 106 remaining in the final position during the first exposure.

[0099] Then, in S313, it is determined whether or not the continuous shooting has ended. If not, the process returns to S101 in FIG. 8, and if it has ended, the image blur correction control ends.

[0100] It should be noted that the lens side image blur correction control is similar to that described with reference to FIG. 5, and therefore the description thereof will be omitted.

[0101] FIG. 10 is a diagram showing an example of control when continuous shooting is performed using an electronic front-curtain shutter mode shutter, and in particular shows control in continuous shooting where the shutter time varies, for example, during bracket shooting, with the horizontal axis indicating time. First, before continuous shooting, the image sensor 106 is held in the center position (S113) and the IBIS does not perform image stabilization, although the OIS continues to perform image stabilization. This is because the IBIS tends to have a narrower range of motion for image stabilization than the OIS, so the image sensor is held in the center position so that the maximum range of motion can be used during exposure.

[0102] When capturing the first image, if the shutter time is longer than a predetermined shutter time (for example, 1 / 1000 seconds) (YES in S301, S303, S305), the OIS and IBIS are controlled by cooperative control method 2. In this case, the image stabilization effect can be improved by cooperative control using cooperative control method 2, and since the shutter time is longer, exposure unevenness is uniformized even with the electronic front curtain shutter method, so that exposure unevenness is not noticeable.

[0103] Between shots (frames) in continuous shooting mode (NO in S311), for the same reason as before the first shot is taken, image stabilization operation by the IBIS is refrained from, and image sensor 106 is held in the final position for the first exposure and image stabilization operation by the OIS is performed (S312).

[0104] If the exposure time for the second image is equal to or shorter than the predetermined shutter time (for example, 1 / 1000 seconds or shorter) (YES in S301 and S303, NO in S305), the IBIS image sensor 106 returns to the center position for the reasons described above to prevent uneven exposure. In this case, image stabilization is performed using only the OIS. After shooting, the OIS continues its anti-shake operation and the IBIS remains in the central position (reference position).

[0105] As described above, according to the third embodiment, when still images are continuously shot, control can be performed using an image stabilization method that is more suited to the shooting conditions.

[0106] In the above-mentioned third embodiment, the case where the control method of the image stabilization is set in the camera body 100 has been described, but the present invention is not limited to this, and the control method may be set in the lens unit 200. In this case, a control method determination unit equivalent to the camera side control method determination unit 166 may be provided in the lens unit 200, which may perform the processes shown in S101 to S307 in FIG. 8 and notify the camera body 100 of the setting contents. In this way, when the operation member of the zoom lens is in the lens unit 200, it is possible to eliminate the need to notify the camera body 100 of the focal length in order to set the control method of the image stabilization. Also, the camera body 100 and the lens unit 200 may each determine the control method of the image stabilization. In this case, it is not necessary to notify the setting contents.

[0107] Also, in the above-described first to third embodiments, the case has been described where the shake correction amount is calculated for each of the IBIS and OIS in each of the camera body 100 and the lens unit 200. However, the shake correction amount may be calculated in either the camera body 100 or the lens unit 200, in which case the calculated shake correction amount may be notified to the IBIS and OIS.

[0108] <Other embodiments> The present invention may be applied to a system made up of a plurality of devices, or to an apparatus made up of a single device.

[0109] The present invention can also be realized by supplying a program for implementing one or more of the functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) that implements one or more of the functions.

[0110] <Summary> The disclosure of this embodiment includes the following configuration.

[0111] (Configuration 1) An image stabilization control device for performing image shake correction by controlling a first correction means for correcting image shake by driving a correction lens included in an imaging optical system in a direction perpendicular to an optical axis, and a second correction means for correcting image shake by driving an imaging element that photoelectrically converts light incident via the imaging optical system and outputs an image signal in a direction perpendicular to the optical axis, An acquisition means for acquiring an amount of shake from the detection means; A selection means for selecting one of a plurality of control methods including a first control method and a second control method for controlling a ratio between the amount of shake corrected by the first correction means and the amount of shake corrected by the second correction means; a calculation means for calculating a correction amount of either the first correction means or the second correction means based on the shake amount and the control method selected by the selection means; a notification means for notifying a means for calculating a correction amount of the other of the first correction means and the second correction means of the control method selected by the selection means, The first control method is a method of performing overcorrection that exceeds the shake amount within a range in which the shake amount can be corrected and a reverse correction that cancels the overcorrection by the second correction means, within a range in which the first correction means can be driven, among a range in which the shake amount can be corrected, the second control method is a method of correcting the amount of shake by using a predetermined ratio between the first correction means and the second correction means over a range in which the amount of shake can be corrected, The selection means makes a selection depending on whether the imaging optical system supports the first control method. 13. An anti-vibration control device comprising:

[0112] (Configuration 2) The image stabilization control device according to configuration 1, characterized in that the selection means selects the first control method when the imaging optical system supports the first control method, and selects the second control method when the imaging optical system does not support the first control method.

[0113] (Configuration 3) 2. The image stabilization control device according to configuration 1, wherein the selection means further selects according to a shutter method and a shutter time of the image sensor.

[0114] (Configuration 4) When the imaging optical system supports the first control method, the selection means selecting the first control method when the shutter method is not an electronic front curtain shutter method in which exposure of the image sensor is started by reset scanning of the image sensor and the exposure is ended by moving a rear curtain of a shutter to block light from the image sensor, selecting the first control method when the shutter time is longer than a predetermined threshold value in the electronic front curtain shutter method; When the electronic front curtain shutter method is used and the shutter time is equal to or less than the threshold value, the second control method is selected. 4. The vibration isolation control device according to configuration 3.

[0115] (Configuration 5) 2. The image stabilization control device according to configuration 1, wherein the selection means further selects according to a shutter method of the image sensor and a focal length of the image pickup optical system.

[0116] (Configuration 6) When the imaging optical system corresponds to the first control method and the shutter method is not an electronic front curtain shutter method in which exposure of the imaging element is started by reset scanning of the imaging element and the exposure is ended by moving a rear curtain of a shutter to block light from the imaging element, the selection means selecting the first control method when the focal length is equal to or less than a predetermined value; When the focal length is longer than the predetermined value, the second control method is selected. 6. The vibration isolation control device according to configuration 5,

[0117] (Configuration 7) 2. The image stabilization control device according to configuration 1, wherein the selection means further makes a selection depending on a shutter method of the image sensor, a shutter time, and whether or not the mode is for continuous shooting of still images.

[0118] (Configuration 8) the plurality of control methods further includes a third control method and a fourth control method; The selection means, when the imaging optical system corresponds to the first control method, the shutter method is an electronic front curtain shutter method in which exposure of the imaging element is started by reset scanning of the imaging element and the exposure is ended by blocking light from the imaging element by traveling a rear curtain of the shutter, is in the mode in which continuous shooting is performed, selecting the third control method when the shutter time is longer than a predetermined threshold; When the shutter speed is equal to or less than the threshold value, the fourth control method is selected; The third control method is a method in which the first correction means is caused to perform correction of the shake amount preferentially over the second correction means, The fourth control method is a method for driving the first correction means and holding the second correction means at a predetermined reference position. 8. The vibration isolation control device according to configuration 7,

[0119] (Configuration 9) The selection means further selects according to a focal length of the imaging optical system, and when the imaging optical system corresponds to the first control system, the shutter system is an electronic front curtain shutter system in which exposure of the imaging element is started by reset scanning of the imaging element and the exposure is ended by moving a rear curtain of the shutter to block light from the imaging element, and the continuous shooting mode is not performed, selecting the second control method when the shutter speed is equal to or less than a predetermined threshold value; longer than the threshold, selecting the first control method when the focal length is equal to or less than a predetermined value; When the focal length is longer than the predetermined value, the second control method is selected. 9. The vibration isolation control device according to configuration 7 or 8.

[0120] (Configuration 10) An image stabilization control device for performing image shake correction by controlling a first correction means for correcting image shake by driving a correction lens included in an imaging optical system in a direction perpendicular to an optical axis, and a second correction means for correcting image shake by driving an imaging element that photoelectrically converts light incident via the imaging optical system and outputs an image signal in a direction perpendicular to the optical axis, An acquisition means for acquiring an amount of shake from the detection means; A selection means for selecting one of a plurality of control methods including a first control method and a second control method for controlling a ratio between the amount of shake corrected by the first correction means and the amount of shake corrected by the second correction means; a calculation means for calculating a correction amount for each of the first correction means and the second correction means based on the shake amount and the control method selected by the selection means, The first control method is a method of performing overcorrection that exceeds the shake amount within a range in which the shake amount can be corrected and a reverse correction that cancels the overcorrection by the second correction means, within a range in which the first correction means can be driven, among a range in which the shake amount can be corrected, the second control method is a method of correcting the amount of shake by using a predetermined ratio between the first correction means and the second correction means over a range in which the amount of shake can be corrected, The selection means makes a selection depending on whether the imaging optical system supports the first control method. 13. An anti-vibration control device comprising:

[0121] (Configuration 11) An image stabilization control device for performing image shake correction by controlling a first correction means for correcting image shake by driving a correction lens included in an imaging optical system in a direction perpendicular to an optical axis, and a second correction means for correcting image shake by driving an imaging element that photoelectrically converts light incident via the imaging optical system and outputs an image signal in a direction perpendicular to the optical axis, an acquisition step of acquiring an amount of shake from the detection means; a selection step of selecting one of a plurality of control methods including a first control method and a second control method for controlling a ratio between the shake amount corrected by the first correction means and the shake amount corrected by the second correction means; a calculation step of determining a correction amount for either the first correction means or the second correction means based on the shake amount and the control method selected in the selection step; a notification step of notifying a means for determining a correction amount of the other of the first correction means and the second correction means of the control method selected in the selection step, The first control method is a method of performing overcorrection that exceeds the shake amount within a range in which the shake amount can be corrected and a reverse correction that cancels the overcorrection by the second correction means, within a range in which the first correction means can be driven, among a range in which the shake amount can be corrected, the second control method is a method of correcting the amount of shake by using a predetermined ratio between the first correction means and the second correction means over a range in which the amount of shake can be corrected, In the selection step, a selection is made depending on whether the imaging optical system supports the first control method. 4. A vibration isolation control method comprising:

[0122] (Configuration 12) A program for causing a computer to function as each of the means of the vibration isolation control device according to any one of configurations 1 to 9.

[0123] (Configuration 13) A computer-readable storage medium storing the program according to configuration 12.

[0124] The invention is not limited to the above-described embodiments, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, the following claims are appended to apprise the public of the scope of the invention. [Explanation of symbols]

[0125] 100: camera body, 200: lens unit, 101: zoom lens, 102: image stabilization lens, 106: image sensor, 110: internal memory, 114: operation unit, 115: camera side control system, 122: lens vibration prevention drive unit, 123: lens vibration prevention position detection unit, 124: zoom lens drive unit, 125: lens side vibration detection unit, 126: lens side vibration prevention control unit, 127: zoom lens control unit, 128: lens side communication unit, 129: camera information management unit, 130: image sensor vibration prevention drive unit, 132: image sensor vibration prevention position detection unit, 133: camera side vibration prevention control unit, 13 4: camera side shake detection unit, 135: camera side communication unit, 137: lens information management unit, 143: camera control unit, 150: imaging optical system, 151: lens side integration unit, 152: lens side shake correction amount calculation unit, 153: lens side ratio accumulating unit, 154: lens side driving range limit unit, 155: image shake correction lens PID control unit, 160: lens side control system, 161: camera side integration unit, 162: camera side shake correction amount calculation unit, 163: camera side ratio accumulating unit, 164: camera side driving range limit unit, 165: camera side PID control unit, 166: camera side control method determination unit

Claims

1. An image stabilization control device for performing image shake correction by controlling a first correction means that corrects image shake by driving a correction lens included in an imaging optical system, and a second correction means that corrects image shake by driving an imaging element that photoelectrically converts light incident via the imaging optical system and outputs an image signal, an acquisition means for acquiring the amount of shake from the detection means; a selection means for selecting one of a plurality of control methods including a first control method and a second control method, the first control method is a control method in which the first correction means performs overcorrection by correcting the shake amount beyond the shake amount, and the second correction means performs inverse correction, The selection means selects the control method depending on whether the imaging optical system is compatible with the first control method.

1. An anti-vibration control device comprising:

2. The vibration-damping control device described in Claim 1, characterized in that the second control method is a control method in which the first correction means performs correction within a range that does not exceed the amount of vibration.

3. The vibration-damping control device described in Claim 2, characterized in that the second control method is a control method that corrects the amount of shake by using a predetermined constant ratio between the first correction means and the second correction means over a range in which the amount of shake can be corrected.

4. An anti-vibration control device as described in Claim 2, characterized in that the second control method is a control method in which the correction of the amount of vibration is performed preferentially by the first correction means over the second correction means.

5. 2. The image stabilization control device according to claim 1, wherein the selection means selects the first control method when the imaging optical system is compatible with the first control method, and selects the second control method when the imaging optical system is not compatible with the first control method.

6. 2. The image stabilization control device according to claim 1, wherein said selection means further selects in accordance with a shutter method and a shutter time of said image pickup device.

7. When the imaging optical system is compatible with the first control method, the selection means selecting the first control method when the shutter method is not an electronic front-curtain shutter method in which exposure of the image sensor is started by reset scanning of the image sensor and the exposure is ended by moving a rear curtain of the shutter to block light from the image sensor, In the electronic front-curtain shutter method, when the shutter time is longer than a predetermined threshold, the first control method is selected; When the electronic front curtain shutter method is used and the shutter time is equal to or less than the threshold value, the second control method is selected.

7. The vibration isolation control device according to claim 6.

8. 2. The image stabilization control device according to claim 1, wherein said selection means further selects in accordance with a shutter system of said image pickup device and a focal length of said image pickup optical system.

9. When the imaging optical system corresponds to the first control system and the shutter system is not an electronic front-curtain shutter system in which exposure of the imaging element is started by reset scanning of the imaging element and the exposure is ended by moving a rear curtain of the shutter to block light from the imaging element, the selection means selecting the first control method when the focal length is equal to or less than a predetermined value; When the focal length is longer than the predetermined value, the second control method is selected.

9. The vibration isolation control device according to claim 8.

10. 2. The image stabilization control device according to claim 1, wherein said selection means further selects according to the shutter type of said image sensor, the shutter time, and whether or not the mode is for continuous shooting of still images.

11. the plurality of control methods further include a third control method and a fourth control method; the selection means, when the imaging optical system corresponds to the first control system, the shutter system is an electronic front-curtain shutter system that starts exposure of the imaging element by reset scanning of the imaging element and ends the exposure by moving a rear curtain of the shutter to block light from the imaging element, and the continuous shooting mode is selected, selecting the third control method when the shutter speed is longer than a predetermined threshold; selecting the fourth control method when the shutter speed is equal to or less than the threshold value; the third control method is a method in which the first correction means is made to perform correction of the shake amount preferentially over the second correction means, The fourth control method is a method of driving the first correcting means and holding the second correcting means at a predetermined reference position.

11. The vibration isolation control device according to claim 10.

12. The selection means further selects in accordance with a focal length of the imaging optical system, and when the imaging optical system corresponds to the first control system, the shutter system is an electronic front curtain shutter system that starts exposure of the imaging element by reset scanning of the imaging element and ends the exposure by moving a rear curtain of the shutter to block light from the imaging element, and the continuous shooting mode is not performed, selecting the second control method when the shutter speed is equal to or less than a predetermined threshold value; longer than the threshold, selecting the first control method when the focal length is equal to or less than a predetermined value; When the focal length is longer than the predetermined value, the second control method is selected.

11. The vibration isolation control device according to claim 10.

13. An anti-shake control device as described in Claim 1, characterized in that the reverse correction is performed by driving the image sensor in a direction that cancels out the amount of correction made by the first correction means that exceeds the amount of shake.

14. The vibration-damping control device described in Claim 13, characterized in that the first control method is a control method in which the first correction means performs over-correction by correcting beyond the amount of shake, and the second correction means cancels out the amount of correction that exceeds the amount of shake, thereby performing the inverse correction.

15. An anti-vibration control device as described in Claim 1, further comprising a calculation means for determining the correction amount of at least one of the first correction means and the second correction means based on the amount of vibration and the control method selected by the selection means.

16. The calculation means calculates a correction amount for either the first correction means or the second correction means, 16. The image stabilization control device according to claim 15, further comprising a notification means for notifying a means for calculating a correction amount for either the first correction means or the second correction means of the control method selected by the selection means.

17. An anti-vibration control device as described in Claim 1, characterized in that each of the multiple control methods is a method for controlling the ratio between the amount of vibration corrected by the first correction means and the amount of vibration corrected by the second correction means.

18. An imaging element that photoelectrically converts incident light via an imaging optical system and outputs an image signal; a second correcting means for correcting image blur by driving the image sensor; an acquisition means for acquiring the amount of shake from the detection means; a selection means for selecting one of a plurality of control methods including a first control method and a second control method different from the first control method, the first control method is a control method in which a first correction unit that corrects image blur by driving a correction lens included in the imaging optical system performs overcorrection that corrects beyond the amount of shake, and the second correction unit performs inverse correction, The imaging device according to claim 1, wherein the selection means selects the control method depending on whether the imaging optical system is compatible with the first control method.

19. A vibration reduction control method for correcting image shake by controlling a first correction unit that corrects image shake by driving a correction lens included in an imaging optical system, and a second correction unit that corrects image shake by driving an imaging element that photoelectrically converts light incident via the imaging optical system and outputs an image signal, comprising: an acquisition step of acquiring the amount of shake from the detection means; a selection step of selecting one of a plurality of control methods including a first control method and a second control method different from the first control method, the first control method is a control method in which the first correction means performs overcorrection by correcting the shake amount beyond the shake amount, and the second correction means performs inverse correction, In the selection step, the control method is selected depending on whether the imaging optical system is compatible with the first control method.

10. A vibration isolation control method comprising:

20. A program for causing a computer to function as each of the means of the vibration isolation control device according to any one of claims 1 to 17.

21. A computer-readable storage medium storing the program according to claim 20.

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