JP2016050973A - Image-capturing device and control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image-capturing device and a control method therefor with which it is possible to suppress a reduction in picture quality caused by the electronic correction of an image blur and reduce the effect of camera shaking, etc., on a captured image.SOLUTION: An image-capturing element 121 captures the image of a subject through a photographing optical system. A shaking detection unit 160 detects the shaking of an image-capturing device and outputs it to a camera shaking correction control unit 152. The camera shaking correction control unit 152 controls an optical camera shaking correction for optically correcting an image blur by the drive of a correction lens 172, and controls an electronic camera shaking correction for electronically correcting an image blur by an image segmentation process. A zoom control unit 151 acquires information on zoom position and speed by a zoom position detection unit 151a. The camera shaking correction control unit 152 determines the applicability of an image blur correction range in accordance with a photographing situation, and, when the image blur correction range is inappropriate for the amount of shaking detected by the shaking detection unit 160, executes a process for changing the amount of image segmentation and the zoom position in accordance with the zoom speed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for correcting image blur caused by shake of an imaging apparatus by optical and electronic camera shake correction.

There are the following two types of correction techniques for correcting the image blur caused by the shake of the image pickup apparatus during moving image shooting. In addition to the optical camera shake correction, electronic camera shake correction is adopted.
-Optical image stabilization: A technology that corrects image blur on the imaging surface by moving an optical lens or image sensor. Image blur is corrected by detecting a shake of the imaging device, driving a correction lens or the like so as to cancel the detected shake, and controlling the imaging position on the imaging surface to be always the same.
Electronic camera shake correction: A technology that corrects image blur on the imaging surface by cutting out and outputting part of the image. Image blur is corrected by moving the output area of the image so as to cancel out the shake obtained in the comparison processing between the images. In order to enhance the image blur correction effect, it is necessary to read image data in a region larger than the image output region (hereinafter, pixels in this region are referred to as surplus pixels).

  In general, by performing the two types of camera shake correction control at the same time, a more enhanced image blur correction effect can be obtained. However, there are items to be considered in order to use both controls together. First, in optical camera shake correction, there is a drive range of a mechanism unit that drives an optical lens for image blur correction and the like, and a drive range in which vignetting does not occur in a captured image. There is. Secondly, when an image sensor of a predetermined size is used, the larger the number of surplus pixels in the electronic camera shake correction, the narrower the output field angle than when the correction is not performed. It is a problem to perform appropriate camera shake correction control in consideration of these matters.

  In response to the above problem, in the apparatus disclosed in Patent Document 1, when electronic camera shake correction is effective, the driving range of the optical lens for optical camera shake correction is larger than when electronic camera shake correction is disabled. Expanding. In addition to the image blur correction effect by electronic camera shake correction, the image blur correction effect is further improved by expanding the drive range of optical camera shake correction. In the apparatus disclosed in Patent Document 2, camera shake correction control corresponding to the zoom position is performed in a method using both the optical camera shake correction method and the electronic camera shake correction. This apparatus includes an angular velocity sensor that detects a shake applied to the imaging apparatus, a zoom encoder that detects a zoom lens position, and a motion vector detection unit that detects a motion vector from a captured image. When the zoom position is within a predetermined range that does not include the wide-angle end and the telephoto end, the control means uses the first shake correction amount and motion vector based on shake detection as compared to when the zoom position is outside the range. Control is performed so as to further suppress the second shake correction amount based thereon. Accordingly, it is possible to perform camera shake correction control suitable for the characteristic of shake that is conspicuous depending on the zoom position.

JP 2014-10328 A JP 2013-135443 A

  In electronic camera shake correction, pixels located in the periphery of an image to be cut out as an output image in the captured image are used as surplus pixels. Therefore, the greater the number of surplus pixels, the greater the range in which camera shake can be corrected. On the other hand, since the angle of view of the output image becomes narrow, there is a concern that the image quality of the recorded image may be reduced. In addition, there are few scenes where a certain range of camera shake correction should always be secured for everyday camera applications. In many cases, the necessary image stabilization range may increase or decrease depending on the subject, shooting conditions, and the like. For this reason, setting the cut-out angle of view uniformly may cause the image quality to be inadvertently lowered.

As described above, in electronic camera shake correction control that corrects image blur by cutting out and outputting a part of image data, the smaller the image cut-out amount, the larger the correctable range and the higher the image blur correction effect. Accompanying image quality degradation. Therefore, adaptive control is required to achieve both the image blur correction effect and the prevention of image quality degradation.
SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging apparatus and a control method thereof that can reduce the influence on a captured image due to camera shake or the like while suppressing deterioration in image quality due to electronic image blur correction.

  An apparatus according to the present invention is an imaging apparatus that detects a shake and corrects an image blur of an image, the imaging means receiving light imaged by a photographing optical system having a zoom mechanism, and the shake of the imaging apparatus Shake detecting means for detecting the image, zoom control means for changing the optical zoom magnification by zoom control of the photographing optical system, and first correction for optically correcting image blur by driving a correction member constituting the photographing optical system. A correction unit; a second correction unit that electronically corrects image blur by image cutout processing on image data output from the imaging unit; and a detection signal from the shake detection unit; The range of image blur correction by the first and second correction means is changed by changing the optical zoom magnification and changing the image cutout amount by the second correction means. And a correction control means for controlling the.

  According to the present invention, it is possible to reduce the influence on a captured image due to camera shake or the like while suppressing deterioration in image quality due to electronic image blur correction.

It is a system diagram concerning one embodiment of the present invention. It is a block diagram concerning one embodiment of the present invention. It is a flowchart concerning one embodiment of the present invention. It is explanatory drawing which concerns on one Embodiment of this invention.

  FIG. 1 is a diagram illustrating a configuration example of an imaging apparatus 101 to which an imaging apparatus system according to an embodiment of the present invention is applied. The optical block unit 170 having a zoom mechanism includes a magnification lens 171, a camera shake correction shift lens (hereinafter referred to as a correction lens) 172, and a focus adjustment lens 173 as a lens group constituting the photographing optical system. The optical block unit 170 includes a diaphragm 174, a shutter 175, and the like. The lens drive control unit 150 is a control unit for driving the movable optical member of the optical block unit 170. The lens drive control unit 150 includes a zoom control unit 151, a camera shake correction control unit 152, a focus control unit 153, an aperture control unit 154, a shutter control unit 155, and the like.

The camera shake correction control unit 152 acquires a shake detection signal from the shake detection unit 160 mounted on the imaging apparatus 101, and drives the correction lens 172 based on the shake information so that no image blur occurs. The correction lens 172 and its drive mechanism unit constitute first correction means for optically correcting image blur. In the present embodiment, an example in which the correction lens 172 is moved in a direction orthogonal to the optical axis as a correction member (image blur correction member) constituting the photographing optical system will be described. However, the present invention is also applicable to an embodiment in which the image sensor is moved. It is. Further, the camera shake correction control unit 152 calculates a correction amount so that the video signal processing unit 125 performs electronic camera shake correction processing. That is, the video signal processing unit 125 constitutes a second correction unit that electronically corrects image blur by a cut-out process for image data.
The zoom control unit 151 acquires information on the zoom position and zoom speed (drive speed) by a zoom position detection unit 151a such as a zoom encoder. In the present embodiment, information on the zoom position and zoom speed is notified to the camera shake correction control unit 152, so that a correction amount calculation process in electronic camera shake correction control is performed according to the zoom position and zoom speed.

  The image sensor 121 receives light imaged by the photographing optical system through the optical block unit 170 and converts the optical image into an electrical signal. The drive timing of the image sensor 121 is controlled by the image capture control unit 122. An A (Analog) / D (Digital) converter 123 converts an analog signal output of the image sensor 121 into a digital signal. The signal after A / D conversion is stored in the internal memory 143 via the image input unit 124. The video signal processing unit 125 performs predetermined signal processing, and performs electronic camera shake correction by image cutout processing according to the correction amount calculated by the camera shake correction control unit 152.

  The memory control circuit 141 controls the A / D converter 123, the video signal processing unit 125, the compression / decompression circuit 142, and the internal memory 143, and controls data recording on the recording medium 144. The image display control unit 126 processes image data for display. The image display unit 106 includes a TFT (thin film transistor) drive type LCD (liquid crystal display device) and the like. The display image data written in the internal memory 143 is displayed by the image display unit 106 via the image display control unit 126. The internal memory 143 is a storage unit for storing captured still image data and moving image data, and can also be used as a work area of the system controller 140. A compression / decompression circuit 142 that compresses / decompresses image data reads the image data stored in the internal memory 143, performs compression processing or decompression processing, and writes the processed data in the internal memory 143 again.

  The system controller 140 controls the entire imaging apparatus 101. The operation unit (see 102 to 105) is configured by a single or a plurality of combinations such as a switch, a dial, and a touch panel for inputting various operation instructions to the system controller 140. The release switch 103 generates a trigger signal for operating a shutter for recording a still image and a trigger signal for instructing start and end of moving image recording. The zoom key 104 is operated by the user when changing the focal length by controlling the zoom lens 171 (zoom control). The menu operation key 105 is used when the user performs a menu operation while viewing the display screen. The power supply control unit 145 supplies a necessary power supply voltage to each unit of the imaging apparatus 101 from the power supply 146 using the operation signal of the power button 102 as a trigger signal.

Next, the configuration of the image blur correction control unit according to the present embodiment will be described with reference to the block diagram of FIG.
The shake detection unit 160 includes an angular velocity sensor or the like mounted on the imaging device 101. The magnitude of shake applied to the imaging device 101 is detected by the output of the angular velocity sensor. The pitch direction shake detection unit 160a detects a shake in the pitch direction, which is a direction around the first axis, of the two rotation axes related to the attitude detection of the imaging device 101. Further, the yaw direction shake detection unit 160b detects a shake in the yaw direction that is the direction around the second axis with respect to the imaging apparatus 101.

The angular velocity signal acquired by the shake detection unit 160 is converted from an analog value to a digital value via the A / D converters 210a and 210b, respectively. The A / D converter 210a A / D converts the shake detection signal of the pitch direction shake detection unit 160a, and the A / D converter 210b performs A / D conversion of the shake detection signal of the yaw direction shake detection unit 160b. The angular velocity signal converted into the digital value is filtered by the filters 220a and 220b. The filter 220a processes the output signal of the A / D converter 210a, and the filter 220b processes the output signal of the A / D converter 210b. This filter processing includes the following processing, for example.
・ High-pass filter processing to remove the offset component and temperature drift component of the angular velocity sensor output.
・ Low-pass filter processing to calculate the shake amount by integrating the angular velocity signal.

  The shake amounts processed by the filters 220a and 220b are processed by the correction amount calculation unit 152a in the camera shake correction control unit 152, and the correction amount of the optical camera shake correction control is calculated. In addition, the camera shake correction control unit 152 includes a shooting situation determination unit 152b. The shooting state determination unit 152b acquires information on the shake amount detected and filtered by the shake detection unit 160 and necessary information from the system controller 140, and the correction amount of the electronic camera shake correction control, the target zoom position, etc. The drive amount of each control unit is calculated. Electronic camera shake correction in the video signal processing unit 125 is performed according to the calculated correction amount, and drive control of the correction lens 172 is performed according to the calculated drive amount.

  The zoom position acquisition unit 161 in FIG. 2 acquires a count number by a zoom encoder, for example, and outputs it to the zoom control unit 151. The zoom control unit 151 controls the zoom lens unit including the magnification lens 171 in accordance with the zoom operation signal. In addition, the camera shake correction control unit 152 acquires outputs from the filters 220a and 220b and information from the system controller 140, and controls a shake correction lens unit including the correction lens 172. Thereby, optical camera shake correction is performed. Details of the optical camera shake correction and the electronic camera shake correction will be described later.

  Next, the control operation of this embodiment will be described with reference to the flowchart of FIG. The following processing is performed according to a program that the CPU (central processing unit) of the system controller 140 reads from the memory and executes.

  In S301, the CPU determines whether the moving image recording switch is turned on. When the moving image recording switch SW is in the ON state (YES in S301), the process proceeds to S302. If the moving image recording switch SW is OFF (NO in S301), the determination process in S301 is repeated. In S302, the cut-out view angle is switched. The cut-out angle of view is an output angle of view corresponding to a region that is set when image cut-out (data extraction) processing is performed by electronic camera shake correction. The smaller the angle of view for clipping, the greater the image blur correction effect. However, since the angle of view output at the start of shooting and recording is switched, it is required to change the angle within a range that does not cause the photographer to feel uncomfortable. In the present embodiment, the initial value of the cut-out angle of view is set to 80%, for example, when the image data is used without being cut out as a reference value (100%).

Here, a method for switching the output angle of view without a sense of incongruity in step S302 will be described.
For example, when the still image shooting mode and the moving image shooting mode are switched according to the mode setting, the output angle of view may be switched when the photographer sets the moving image shooting mode. Thus, the photographer can start shooting after confirming the angle of view at the start of moving image recording. On the other hand, in an apparatus specification in which a release switch for still image shooting and a release switch for moving image shooting are laid out as separate operation switches, still images and moving images can be shot without mode setting. In such a case, the angle of view is switched at the moment of starting moving image recording. The photographer needs to perform framing in consideration of the change in the angle of view. If this fails, there is a concern that the subject will be off the screen and the subject will be completely out of view.
Therefore, if you want to start movie shooting with priority on framing, when the release switch for movie shooting is pressed, the zoom position is once changed to the wide-angle side and recording is started after securing the cutout amount. Is executed. With this processing, moving image shooting can be started at an angle of view intended by the photographer. However, the above method is impossible at the wide-angle end.

  In S303, optical image stabilization control and electronic image stabilization control are started. In step S304, the CPU executes a moving image recording start process. A photographed image at this time is illustrated in FIG. In FIG. 4B, the initial cut-out angle of view is set to 80%. Electronic camera shake correction is realized by shifting the output field angle so as to cancel image blur in accordance with the amount of shake caused by camera shake or the like within a hatched area (excess pixel range). At this time, the movable range (correctable range) by electronic camera shake correction is calculated as follows.

First, the output angle of view when the electronic image stabilization control is not activated is set to a [degree] in the horizontal direction and b [degree] in the vertical direction. When the electronic image stabilization control is set to be valid, the output field angle is switched to an initial value of 80 [%], so that 80 × a / 100 [degree] in the horizontal direction and 80 × b / in the vertical direction. 100 [degree]. The movable range that can be used for electronic image stabilization by this switching is as follows.
Vertical (pitch) direction: (100-80) × a / 100 = 20 × a / 100 [degree]
Horizontal (yaw) direction: (100-80) × b / 100 = 20 × b / 100 [degree]
Here, the movable range of the optical image stabilization is φ [degree] and Ψ [degree] in the pitch direction and the yaw direction, respectively. The movable range obtained by enabling the optical camera shake correction and the electronic camera shake correction is as follows.
・ Pitch direction: φ + 20 × a / 100 [degree]
・ Yaw direction: Ψ + 20 × b / 100 [degree]
That is, it can be seen that the correction action is enhanced by the combined use of two types of camera shake correction control.

  When the processing of S304 ends, in S305, the CPU compares the camera shake amount (detection amount) acquired by the shake detection unit 160 with the movable range of camera shake correction control set at the start of movie shooting during moving image recording. By comparing the shake amount of the camera with the movable range of the camera shake correction control set at the start of moving image shooting, the determination process for the suitability is performed. Regarding the determination criteria at that time, in addition to the shake amount of the imaging apparatus acquired from shake detection means such as an angular velocity sensor and a motion vector, for example, based on the result of shooting scene determination, the set shooting mode, and subject information Determined. For example, in the case of a scene that captures a landscape or the like for which high resolution is required, in this case, the threshold width serving as a criterion is set narrow. Further, based on the determination criterion, the image clipping amount for electronic camera shake correction stored in the imaging apparatus may be set large. With this change, the drive parameter of the optical zoom position also changes. Alternatively, in the case of a scene where it is desired to reduce the shake applied to the imaging apparatus, such as a sports scene, the threshold value range that is a criterion is set wide. Further, the image cutout amount for electronic camera shake correction may be set small based on the determination criterion. With this change, the drive parameter of the optical zoom position also changes. As a result, camera shake correction control adapted to the scene becomes possible.

  Further, it is assumed that the shooting situation determination unit 152 includes a panning / tilting determination unit. In this case, when it is determined that the photographer is performing a panning operation or a tilting operation, the zoom position and the cut-out angle of view described below may not be changed. As a result, the panning operation and the tilting operation intended by the photographer are facilitated, and usability is improved.

If it is determined by the determination process in S305 that the cut-out angle of view is appropriate for the shake amount based on the determination result of the shooting situation determination unit 152 (OK in S305), the process proceeds to S311. If it is determined (NG in S305), the process proceeds to S306.
In S311, the CPU determines whether the moving image recording switch has been turned OFF. When the moving image recording switch is turned off (YES in S311), the process proceeds to S312 and a moving image recording end process is performed. If the moving image recording switch remains ON (NO in S311), the process returns to S305.

  In S306, the zoom position acquisition unit 161 acquires information on the zoom position and zoom speed. In S307, based on the zoom position acquired in S306 and the result of the shooting situation determination in S305, the camera shake correction control unit 152 calculates an appropriate zoom position, that is, a target value of the optical zoom magnification, and an image clipping amount. Process. The zoom position and the optical zoom magnification acquired in S306 are set to Zp1 and M1 [times], respectively. The movable range of optical camera shake correction at this time is φ1 [degree] in the pitch direction and Ψ1 [degree] in the yaw direction. In addition, the image cutout amount in the electronic image stabilization is S1 [%]. Hereinafter, an example of calculation processing of the zoom position, the target value of the optical zoom magnification, and the cut-out angle of view will be described. For simplicity, only the pitch direction will be mentioned.

As a result of the shooting situation determination, assuming that the imaging apparatus 101 is swinging in the pitch direction at θ1 [degree], θ1 is assumed to be sufficiently smaller than the movable range “φ1 + (100−S1) × a / 100” [degree]. To do. That is,
θ1 <φ1 + (100−S1) × a / 100 [degree]
Is established, the camera shake correction movable range is sufficiently large with respect to the shake amount θ1 [degree] of the imaging apparatus 101. In this case, it is not desirable because there is a possibility that the image quality is inadvertently deteriorated. Therefore, in order to weaken the effectiveness of electronic image stabilization and improve image quality, a process is performed in which the optical zoom magnification is relatively increased and the proportion of the cut-out angle of view is increased by that amount so that there is no change in the angle of view. The This calculation process is shown below.

The zoom position that is the target value is Zp2, the target value of the optical zoom magnification is M2, and the movable range of optical camera shake correction at that time is φ2. The amount of image cutout in the electronic image stabilization is S2 [%]. The target value to be obtained is that the shake amount θ1 of the imaging apparatus 101 is smaller than the sum of the movable range φ2 for optical camera shake correction at the zoom position Zp2 and the movable range (100−S2) × a / 100 for electronic camera shake correction. Or the maximum zoom position. That is, the following formula is established.
θ1 ≦ φ2 + (100−S2) × a / 100 <φ1 + (100−S1) × a / 100 [degree]
The image cutout amount S2 at this time may be increased so as to cancel the change in the optical zoom magnification. Therefore, the cutout amount S2 is
S2 = S1 × M2 / M1 [%]
It becomes.

As described above, the image cutout amount S depends on the zoom position. For example, in this embodiment, it is assumed that the optical zoom magnification is changed to 1.125 times in accordance with the change of the zoom positions Zp1 to Zp2.
M2 = M1 × 1.125
At the start of shooting, the cutout amount of the image at the zoom position Zp1 is 80 [%]. Therefore, the cutout amount S2 to be obtained is
S2 = 80 × 1.125 = 90 [%]
It becomes. The cut-out angle of view at this time is shown in FIG. Therefore, the movable range of electronic camera shake correction is as follows.
(100−S2) × a / 100 = 10 × a / 100 [degree]
Therefore, the total of the movable range in the optical image stabilization and the movable range in the electronic image stabilization is
φ2 + 10 × a / 100 [degree]
It becomes. In this way, it is possible to improve the image quality of a captured moving image by narrowing the correction range for electronic camera shake correction.

Further, as a result of the shooting state determination, the shake of the imaging apparatus 101 is θ2 (> θ1) [degree] in the pitch direction, and θ2 is larger than the movable range “φ1 + (100−S1) × a / 100” [degree]. Assume a large case. That means
θ2> φ1 + (100−S1) × a / 100 [degree]
Is established, the movable range is small with respect to the shake amount θ2 [degree] of the imaging apparatus 101. Therefore, it is necessary to enhance the image blur correction effect, and processing for reducing the optical zoom magnification relatively and reducing the cut-out angle of view by that amount so that there is no change in the angle of view is executed. This calculation process is shown below.

The zoom position that is the target value is Zp3, the target value of the optical zoom magnification is M3, and the movable range of optical camera shake correction at that time is φ3. In addition, the cutout amount of the image in the electronic camera shake correction is S3 [%]. The target value to be obtained is the sum of the optical camera shake correction movable range φ3 at the zoom position Zp3 and the electronic camera shake correction movable range (100−S3) × a / 100, which is larger than the shake amount θ2 of the imaging apparatus 101. Or the minimum zoom position. That is, the following formula is established.
φ1 + (100−S1) × a / 100 <θ2 ≦ φ3 + (100−S3) × a / 100 [degree]
The image cutout amount S3 at this time may be made small so as to cancel the change in the optical zoom magnification. Therefore, the cutout amount S3 is
S3 = S1 × M3 / M1 [%]
It becomes. For example, in this embodiment, it is assumed that the optical zoom magnification is changed to 0.875 times in accordance with the change of the zoom positions Zp1 to Zp3.
M3 = M1 × 0.875
At the start of shooting, the cutout amount of the image at the zoom position Zp1 is 80 [%]. Therefore, the cutout amount S3 to be obtained is
S2 = 80 × 0.875 = 70 [%]
It becomes. The cut-out angle of view at this time is shown in FIG. Therefore, the movable range of electronic camera shake correction is as follows.
(100−S3) × a / 100 = 30 × a / 100 [degree]
Therefore, the total of the movable range in the optical image stabilization and the movable range in the electronic image stabilization is
φ3 + 30 × a / 100 [degree]
It becomes. In this way, it is possible to enhance the image blur correction effect by expanding the correction range for electronic camera shake correction.

  In S307 of FIG. 3, as in the above two examples, the target values of the zoom position and the cutout amount are set according to the shake amount of the imaging apparatus 101 and the current movable range. This is summarized in Table 1 below (IS represents image blur correction).

  When the process of S307 ends, the process proceeds to the determination process of S308, and the CPU determines whether or not the zoom position at the current optical zoom magnification is the telephoto end. If the zoom position is at the telephoto end (YES in S308), the process proceeds to S309. If the zoom position is not at the telephoto end (NO in S308), the process proceeds to S313.

  In step S309, actuator driving and parameter change processing are performed so that the target values of the zoom position and image cutout amount obtained in step S307 are obtained. Since the zoom position is already at the telephoto end, the only change accepted here is to reduce the optical zoom magnification and reduce the amount of image cropping. That is, the zoom position is limited to the direction to change to the wide angle side. In the present embodiment, the parameter table is stored in the internal memory 143 of the imaging apparatus 101. By referring to this table data, it is possible to set a target value and control the parameter gradually closer to the target value. Therefore, it is possible to smoothly change the angle of view so that no change occurs in the shooting angle of view, that is, the output angle of view of the moving image. In addition, since the zoom speed (drive speed) can be calculated from the count cycle acquired by the zoom encoder by the zoom position acquisition unit 161, the image cutout amount may be changed according to the calculated zoom speed. As a result, the cutout amount can be changed in consideration of the zoom speed. When the process of S309 ends, the process proceeds to the determination process of S310.

  In S313, the CPU determines whether or not the current zoom position is at the wide-angle end. If the result of determination is that the current zoom position is at the wide-angle end (YES in S313), the process proceeds to S314. If the current zoom position is not at the wide-angle end (NO in S313), the process proceeds to S315. In S314, actuator drive and parameter change processing is executed so that the target values of the zoom position and the image cutout amount obtained in S307 are obtained. The only change accepted here is that the zoom position is already at the wide-angle end, so that the optical zoom magnification is increased and the image cutout amount is increased. That is, the zoom position is limited to the direction to change to the telephoto side. When the process of S314 ends, the process proceeds to S310. In S315, actuator drive and parameter change processing is executed so as to achieve the target values of the zoom position and image cutout amount obtained in S307. When the process of S315 ends, the process proceeds to S310.

In S310, determination processing is performed as to whether or not the zoom position has reached the target value and the optical zoom magnification has reached the target magnification. This determination process is performed based on the count number by the zoom encoder acquired by the zoom position acquisition unit 161. If it is determined in S310 that the zoom position has not reached the target value (NO in S310), the process returns to the determination process in S308. If it is determined that the zoom position has reached the target value (YES in S310), the process proceeds to S311. When the moving image recording switch is turned off (YES in S311), the process proceeds to S312 and the moving image recording end process is executed, and the series of processes ends.
According to the present embodiment, it is possible to suppress deterioration in image quality caused by electronic camera shake correction and to appropriately reduce the influence on the image due to camera shake or the like.

[Other Embodiments]
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

REFERENCE SIGNS LIST 121 Image sensor 125 Video signal processing unit 151 Zoom control unit 152 Camera shake correction control unit 152a Correction amount calculation unit 152b Shooting condition determination unit 160 Shake detection unit 172 Camera shake correction shift lens

Claims (9)

An imaging apparatus that detects shake and corrects image blurring of an image,
Imaging means for receiving light imaged by a photographing optical system having a zoom mechanism;
Shake detection means for detecting shake of the imaging device;
Zoom control means for changing the optical zoom magnification by zoom control of the photographing optical system;
First correction means for optically correcting image blur by driving a correction member constituting the photographing optical system;
Second correction means for electronically correcting image blur by image cutout processing on image data output by the imaging means;
The first and second correction units obtain the detection signal of the shake detection unit, change the optical zoom magnification by the zoom control unit, and change the image cutout amount by the second correction unit. An image pickup apparatus comprising: a correction control unit that performs control to change a range of correction of image blur due to the camera.   The correction control unit determines whether or not the range of image blur correction by the first and second correction units is appropriate according to a shooting situation, and changes the cutout amount of the image with respect to the detection signal of the shake detection unit. If it is determined that it should be, the change of the optical zoom magnification by the zoom control unit and the change of the image cropping amount by the second correction unit are controlled with respect to the current zoom position of the photographing optical system. The imaging apparatus according to claim 1. The zoom control means includes a detection means for detecting a zoom position and a zoom speed of the photographing optical system,
The correction control means includes a calculation means for calculating an image blur correction amount by the first correction means and an image blur correction amount by the second correction means,
The arithmetic means calculates the target value of the correction amount when changing the optical zoom magnification by the zoom control means and the target value of the correction amount when changing the image cut-out amount by the second correction means. The imaging apparatus according to claim 2, wherein calculation is performed for each position and zoom speed.   The correction control unit includes a determination unit that determines a shooting state, and includes a shake amount of the imaging apparatus detected by the shake detection unit, a set shooting mode, subject information, and a panning operation or a tilting operation of the imaging apparatus. The imaging apparatus according to claim 3, wherein a shooting situation is determined from at least one of the information, and a target value of the correction amount is calculated.   5. The imaging apparatus according to claim 3, wherein the correction control unit limits the zoom position of the photographing optical system to a direction in which the zoom position is changed to a wide-angle side when the zoom position is at a telephoto end.   5. The imaging apparatus according to claim 3, wherein the correction control unit limits the zoom position of the photographing optical system to a direction in which the zoom position is changed to a telephoto side when the zoom position is at a wide-angle end.   The correction control means relatively increases the optical zoom magnification by the zoom control means when the range of image blur correction is large relative to the shake amount of the imaging apparatus detected by the shake detection means, and 7. The image pickup apparatus according to claim 1, wherein a process of increasing an image cut-out amount by the correction unit is performed.   The correction control means relatively reduces the optical zoom magnification by the zoom control means when the image blur correction range is small with respect to the shake amount of the imaging device detected by the shake detection means, and The image pickup apparatus according to claim 1, wherein a process of reducing an image cut-out amount by the correcting unit is performed. A control method that is executed by an imaging apparatus that includes an imaging unit that receives light imaged by a photographing optical system having a zoom mechanism and detects shake and corrects image blur of an image,
Detecting a shake of the imaging apparatus by a shake detection means;
Changing the optical zoom magnification of the photographing optical system by zoom control means;
A first correction step in which a first correction unit optically corrects image blur by driving a correction member constituting the photographing optical system;
A second correction step in which a second correction unit electronically corrects image blur by image cutout processing on image data output by the imaging unit;
The correction control means acquires the detection signal of the shake detection means, changes the optical zoom magnification by the zoom control means in the first correction step, and sets the image cutout amount in the second correction step. A control method characterized by performing control to change a range of image blur correction by the first and second correction means by changing.

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