JP2014215358A - Image blur correction device and optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image blur correction device and an optical device that enable an excellent blur correction.SOLUTION: An image blur correction device 100 according to the present invention comprises: an angular velocity sensor 12A; an acceleration sensor 12B; an angle oscillation amount computation part 35 that computes an amount of an angle blur from an output of the angular velocity sensor; a translational blur amount computation part 34 that computes an amount of a translational blur from both sensors; an initial value computation part 39 that computes an initial value of the amount of the translational blur from the output of the angular velocity sensor; and a drive amount computation part 38 that computes a drive amount of a blur correction optical system from both amounts of the blurs. For a prescribed time after a blur correction is started, the initial value computation part computes the initial value, the translational blur amount computation part does not perform a translational blur correction amount computation, the angle blur amount computation part performs a computation of the amount of the angle blur, the drive amount computation part computes the drive amount of the blur correction optical system from the amount of the angle blur, and after the predetermined time elapses, the translational blur amount computation part performs the translational blur correction amount computation on the basis of a result obtained from the initial value, the angle blur amount computation part performs the computation of the amount of the angle blur, and the drive amount computation part computes the drive amount of the blur correction optical system, using both amounts of the blurs.

Description

  The present invention relates to an image blur correction apparatus and an optical apparatus.

At the time of high-magnification shooting, the influence of translational blur becomes large, but a general blur correction system using only an angular velocity sensor cannot detect translational blur. For this reason, there is a problem that blur correction accuracy deteriorates during high-magnification shooting.
In order to solve this problem, the translational blur component is calculated by calculating the posture of the camera using a triaxial acceleration sensor and a triaxial angular velocity sensor, and calculating and removing the gravitational acceleration component included in the output of the acceleration sensor. A technique (Patent Document 1) that improves the blur correction accuracy at the time of high-magnification shooting by calculating and correcting only this is proposed. This is to obtain the displacement amount of translational blur based on the output of the 6-axis sensor.

JP 7-225405 A

  An object of the present invention is to provide an image blur correction apparatus and an optical apparatus that can perform good blur correction.

The present invention solves the above problems by the following means.
The invention according to claim 1 is an angular velocity sensor that detects angular velocity, an acceleration sensor that detects acceleration, an angular blur amount calculation unit that calculates an angular blur amount from an output of the angular velocity sensor, an output of the angular velocity sensor, and A translational blur amount calculation unit for calculating a translational blur amount using the output of the acceleration sensor; and an initial value used for the calculation of the translational blur amount by the translational blur amount calculation unit using the output of the angular velocity sensor. An image blur correction apparatus comprising: an initial value calculation unit; and a drive amount calculation unit that calculates a drive amount of a blur correction optical system using the angular blur amount and the translation blur amount. For a predetermined time after the start, the initial value calculation unit calculates the initial value, the translation blur amount calculation unit does not perform translation blur correction amount calculation, and the angle blur amount calculation unit calculates the angle blur amount. The drive amount calculation unit calculates the drive amount of the shake correction optical system using the angular shake amount, and after the predetermined time has elapsed, the translational shake amount calculation unit is A translational blur correction amount is calculated based on a result obtained from an initial value, the angular blur amount calculating unit calculates the angular blur amount, and the driving amount calculating unit is configured to calculate the angular blur amount and the translational blur amount. The image blur correction device is characterized in that the driving amount of the blur correction optical system is calculated using
The invention according to claim 2 is the image blur correction device according to claim 1, wherein the initial value is an average value of the output of the acceleration sensor or the angular velocity sensor within the predetermined time. This is a featured image blur correction apparatus.
A third aspect of the present invention is the image blur correction apparatus according to the first or second aspect, wherein a gravitational acceleration component calculating unit that calculates a gravitational acceleration component included in an output of the acceleration sensor, and the gravity Based on the calculation result of the acceleration component calculation unit, a gravitational acceleration component subtraction unit that removes the gravitational acceleration component from the output of the acceleration sensor, and a first provided between the angular velocity sensor and the gravitational acceleration component calculation unit. And a high-pass filter, wherein the initial value calculated by the initial value calculator is a first initial value input to the first high-pass filter.
A fourth aspect of the present invention is the image blur correction apparatus according to any one of the first to third aspects, wherein a gravitational acceleration component calculating unit that calculates a gravitational acceleration component included in the output of the acceleration sensor; And a gravitational acceleration component subtraction unit that removes the gravitational acceleration component from the output of the acceleration sensor based on the calculation result of the gravitational acceleration component calculation unit, and is provided between the acceleration sensor and the gravitational acceleration component subtraction unit. A second high-pass filter, wherein the initial value calculated by the initial value calculation unit is a second initial value input to the second high-pass filter. is there.
A fifth aspect of the present invention is the image blur correction apparatus according to the fourth aspect, further comprising a camera posture calculation unit that calculates an initial posture of the camera using the second initial value. This is an image blur correction device.
A sixth aspect of the present invention is the image blur correction device according to the fifth aspect, wherein the translation blur amount calculation unit includes a third high-pass filter, a gain adjustment unit, a first integration circuit, and a fourth integration circuit. The image blur correction apparatus includes a high-pass filter and a second integration circuit in order, and the gain adjustment unit gradually increases the gain within the predetermined time.
The invention described in claim 7 is an optical apparatus including the image blur correction device according to any one of claims 1 to 6.
In addition, the said structure may be improved suitably, and at least one part may substitute for another structure.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the image blur correction apparatus and optical instrument which can perform favorable blur correction.

It is sectional drawing which shows typically 1st Embodiment of the camera of this invention. It is a figure explaining the camera coordinate system of 1st Embodiment of the image blurring correction apparatus by this invention. 1 is a block diagram showing a first embodiment of an image blur correction device according to the present invention. FIG. It is a block diagram of an image blur correction device, an acceleration sensor, and an angular velocity sensor of the present embodiment. (A) is a figure explaining HPF, (b) is a figure explaining LPH equivalent to HPF. It is the figure which showed the LPF part of FIG.5 (b) in detail. This is a waveform example when the initial value V00 has an error with respect to the true value as a comparison form. It is a flowchart explaining operation | movement of 1st Embodiment of the image blurring correction apparatus by this invention. It is a flowchart explaining the blurring correction calculation of 1st Embodiment of the image blurring correction apparatus by this invention. It is a flowchart which shows the subroutine of the translation blur amount calculation of the image blur correction apparatus which concerns on 1st Embodiment. It is a waveform example of this embodiment when a value obtained by averaging ω5 for a predetermined time is used as the initial value V00. It is a block diagram which shows 2nd Embodiment of an image blurring correction apparatus. It is a block diagram which shows 3rd Embodiment of an image blurring correction apparatus. It is the graph which showed the gain with respect to the initial value of a HPF part in the image blurring correction apparatus of 3rd Embodiment on the horizontal axis.

(First embodiment)
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a cross-sectional view schematically showing a camera 1 including the image blur correction device of the first embodiment.
The camera 1 is a digital single-lens reflex camera, and includes a camera housing 1A and a lens barrel 1B that is detachably attached to the camera housing 1A.
The CPU 2 is a central processing unit that calculates the amount of movement of the lens groups such as the zoom group 4, the focus group 5, and the blur correction group 6 and controls the entire camera 1, and includes the image blur correction device 100 of the present embodiment. .
The imaging element 3 is an element that captures a subject image formed by the photographing lenses (4, 5, 6), exposes the subject light to convert it into an electrical image signal, and outputs it to the signal processing circuit 15. The image pickup device 3 is configured by an element such as a CCD or a CMOS.

  The zoom group 4 is a lens group that is driven by the zoom group driving mechanism 7 and moves along the optical axis direction to continuously change the magnification of the image. The focus group 5 is a lens group that is driven by the focus group drive mechanism 8 and moves in the optical axis direction to focus. The shake correction group 6 (optical element) is a lens group that is optically shake-corrected and driven on a plane perpendicular to the optical axis by a shake correction group drive mechanism 9 such as a VCM.

The diaphragm 10 is a mechanism that is driven by the diaphragm drive mechanism 11 and controls the amount of subject light passing through the photographing lenses (4, 5, 6).
The acceleration sensor 12 </ b> A and the angular velocity sensor 12 </ b> B are sensors that detect shake acceleration and angular velocity generated in the sensor unit, respectively.

The recording medium 13 is a medium for recording captured image data, and an SD card, a CF card, or the like is used.
The EEPROM 14 is a memory that stores adjustment value information such as a gain value of the acceleration sensor 12A, information unique to the lens barrel, and the like, and outputs the memory to the CPU 2.
The signal processing circuit 15 is a circuit that receives an output from the image sensor 3 and performs processing such as noise processing and A / D conversion.
The AF sensor 16 is a sensor for performing AF (automatic focus adjustment), and a CCD or the like can be used.
The release switch 17 is a member that performs a photographing operation of the camera 1 and is a switch that operates a shutter driving timing and the like.

The rear liquid crystal 18 is provided on the rear surface of the camera housing 1A of the camera 1 and displays a subject image (reproduced image, live view image) photographed by the image sensor 3 and information (menu) related to operation. It is.
The shutter 20 is disposed behind the mirror 19. Subject light is incident on the shutter 20 when the mirror 19 rotates upward and becomes ready for photographing. The shutter 20 travels through a shutter curtain in response to a shooting instruction from the release switch 17 or the like, and controls subject light incident on the image sensor 3.

FIG. 2 is a diagram for explaining the camera coordinate system of the first embodiment of the image blur correction apparatus 100 according to the present invention.
As shown in FIG. 2A, the acceleration sensor 12A is a sensor that detects acceleration having sensitivity in the X-axis, Y-axis, and Z-axis directions of the camera 1, and a G sensor or the like is used. In this embodiment, the intersection of the image pickup surface of the image pickup device 3 and the optical axis of the photographing lens (4, 5, 6) is the origin O of the orthogonal coordinates, and the optical axis of the photographing lens (4, 5, 6) is the Z axis. The imaging surface of the imaging device 3 is represented as an XY plane.
The angular velocity sensor 12B is a sensor such as a vibration gyro that detects angular velocities around the X axis (Pitch), the Y axis (Yaw), and the Z axis (Roll).

  The output value of the acceleration sensor 12A includes acceleration generated by translational motion and gravitational acceleration. Further, since the posture of the camera 1 is changed by the rotational movement of the camera 1, the angle formed by the detection axis direction of the acceleration sensor 12A fixed to the camera coordinate system and the gravitational acceleration direction is changed. For this reason, the magnitude of the gravitational acceleration included in the output value of the acceleration sensor 12A changes. Accordingly, the gravitational acceleration component is removed from the output value of the acceleration sensor 12A, and the displacement is calculated using only the acceleration component generated by the translational motion.

FIG. 3 is a block diagram showing a first embodiment of the image blur correction apparatus 100 according to the present invention.
The image blur correction apparatus 100 includes a camera posture calculation unit 31, a gravity acceleration component calculation (g calculation) unit 32, and a gravity acceleration component subtraction unit 33 in order to remove the gravitational acceleration component.
Further, the image blur correction apparatus 100 performs high-pass processing on the output value of the angular velocity sensor 12B using the initial value calculation unit 39 to which the output of the angular velocity sensor 12B is input and the initial value calculated by the initial value calculation unit 39. HPF1.

  The camera posture calculation unit 31 is a part for obtaining the initial posture of the camera 1 and obtains it using the gravitational acceleration direction obtained from the output of the acceleration sensor 12A. Here, since the camera 1 has rotational vibration and translational vibration, the gravitational acceleration direction is continuously measured for an appropriate time, and the average gravitational acceleration direction is obtained by calculating the average of the measurement results. In this way, the average posture of the camera with respect to the inertial coordinate system 41 is obtained from the gravitational acceleration direction in the camera coordinate system 42 shown in FIG. 2, and this is set as the initial posture of the camera 1.

The gravitational acceleration component calculation unit 32 calculates a coordinate conversion matrix for converting from an inertial coordinate system 41 that is a stationary coordinate system to a camera coordinate system 42 that is a motion coordinate system, and the coordinate is converted into a gravitational acceleration component in the inertial coordinate system 41. The gravity acceleration component in the camera coordinate system 42 is obtained by multiplying the transformation matrix.
The coordinate transformation matrix includes the initial posture of the camera 1 that is the output of the camera posture calculation unit 31 and the acceleration around the three axes that is the output of the angular velocity sensor 12B (the signal is processed by the angle shake amount calculation unit 35 described later). And is calculated using The output of the acceleration sensor 12A is a value after high-pass processing is performed by the HPF 1 using an initial value that will be described later in detail, which is calculated by the initial value calculator 39.

  This calculation method is a method used in a strap-down type inertial navigation device or the like, and the details thereof are disclosed in, for example, Japanese Patent Laid-Open No. 2-309702. A method for calculating the coordinate transformation matrix is disclosed in Japanese Patent Laid-Open No. 7-225405.

  The gravitational acceleration component subtracting unit 33 subtracts the output of the gravitational acceleration component calculating unit 32 from the acceleration in the X-axis and Y-axis directions that are output values of the acceleration sensor 12A to remove the gravitational acceleration component, thereby performing translational motion. Find the generated acceleration.

  The translational blur amount calculation unit 34 removes the low frequency component from the output of the gravitational acceleration component subtraction unit 33 by HPF, and then integrates by the integration filters 34a and 34b twice, so that the X axis and Y axis directions are repeated. The displacement of the translational motion is calculated and output to the lens target position calculation unit 36.

  The angular blur amount calculation unit 35 removes low frequency components from the output of the angular velocity sensor 12B around the X axis (Pitch), around the Y axis (Yaw), and around the Z axis (Roll) with the HPF 4, and then integrates with an integration filter. Then, the displacement of the rotational motion is calculated and output to the lens target position calculation unit 36.

The lens target position calculation unit 36 calculates the target position of the lens based on information from the translation blur amount calculation unit 34, the angle blur amount calculation unit 35, and the focus information acquisition unit 37.
The lens drive amount calculation unit 38 drives the shake correction group drive mechanism (VCM) 9 from the target position from the lens target position calculation unit 36 and the current position of the shake correction group 6 detected by the lens position detection unit 21. Is calculated.

Next, the image blur correction apparatus 100 will be described in further detail. FIG. 4 is a basic configuration block diagram of the image blur correction apparatus 100.
The gravitational acceleration correction unit 30 calculates and removes the gravitational acceleration component included in the acceleration sensor 12A using the information of the angular velocity sensor 12B.

Here, the angular velocity information used for posture calculation is an output after HPF processing (HPF1) for DC cut. Since HPF normally uses a filter with a large time constant (fc = about 0.1 Hz), it takes time until the computation after HPF processing is stabilized.
That is, immediately after the start of the blur correction calculation, the HPF calculation (HPF1) of the angular velocity sensor 12B is not stable, so that the gravitational acceleration component is not sufficiently removed. Further, the HPF2 provided in the translational blur amount calculation unit 34, Since the calculation by the HPF 3 is not stable, the accuracy of the translation blur calculation result is poor and the error may be increased.

Hereinafter, processing of the HPF 1 immediately after the start of blur correction calculation will be described. In this embodiment, the fc of HPF 1 is set high immediately after the start of calculation.
FIG. 5A is a diagram illustrating an HPF (high pass filter), and FIG. 5B is a diagram illustrating an LPH (low pass filter) equivalent to the HPF. As shown in the figure, the HPF (FIG. 5A) in FIG. 4 is equivalent to FIG. 5B, and the model shown in FIG.
Further, the LPF of FIG. 5B can be represented by FIG. Note that fc is variable.

  The cause of the problem that the HPF calculation is not stable immediately after the start of the calculation is the initial value V00 in FIG. The initial value: V00 is preferably a true value (true integration reference value), but a true value cannot be obtained.

For this reason, generally (in cases other than this embodiment), ω5 (input value) at the start of calculation is used for V00. FIG. 7 shows a waveform form when the initial value V00 has an error with respect to the true value as a comparison form. If V00 includes an error, it takes several seconds for the ω0 calculation result to stabilize, and the translation blur calculation result during this period is inaccurate, rather it may worsen the error.
Also, due to this, an unnatural behavior can be seen immediately after the start of translational blur correction.

  Since the above problem is largely related to the initial value of HPF, in this embodiment, the initial value of HPF in the translation blur amount calculation unit 34 is within a predetermined time (100 ms to 1 second, for example, 500 ms) immediately after the start of calculation. Using the average value of ω5, the initial value calculation unit 39 performs a calculation to obtain the average value.

FIG. 8 is a flowchart for explaining the operation of the first embodiment of the image blur correction apparatus 100 according to the present invention.
In S1, it is determined whether or not the release switch 17 is half-pressed. If the release switch 17 is half-pressed, the process proceeds to S2.
Next, acquisition of focal length information (S2) and acquisition of subject distance information (S3) are performed.
In S4, the shooting magnification: β information is acquired, and it is determined whether or not the shooting magnification: β is equal to or greater than a predetermined threshold β _th (S5). If the result is affirmative, the process proceeds to S6. , Go to S9.

  In S6, it is determined whether or not the predetermined time has elapsed since the half-press. If it has elapsed (step S6, YES), the process proceeds to S8.

  When the time after half-pressing is equal to or shorter than the predetermined time (step S6, NO), a process for acquiring gravity acceleration calculation +0 (acquisition of an average value of ω5 within a predetermined time) is performed (step S7), Performs normal blur correction processing (corrects only angle blur). After the predetermined time has elapsed, the obtained average value of ω5 is set as the initial value V00 of the initial value of the HPF unit, and translational blur correction processing is performed.

In S8, a micro blur correction calculation subroutine is called. FIG. 9 is a flowchart showing a subroutine for micro blur correction calculation.
In S61, acceleration data (X, Y, Z) is read. In S62, angular velocity data (Pitch, Yaw, Roll) is read.

In S63, the camera posture calculation unit 31 calculates the camera initial posture from the acceleration data of the acceleration sensor 12A.
In S64, the gravitational acceleration component calculation unit 32 calculates the gravitational acceleration from the camera initial posture information and the angular velocity data of the angular velocity sensor 12B from the posture calculation result of the camera posture.
In S65, the gravitational acceleration component subtraction unit 33 subtracts the gravitational acceleration included in the acceleration data.

In S66, a translation blur calculation subroutine is called. Details of this will be described later.
In S67, the angle blur amount calculation unit 35 calculates the angle blur amount from the angular velocity data.
In S68, the lens target position calculator 36 calculates the lens target position of the blur correction group drive mechanism 9 from the translation blur amount and the angle blur amount, and then returns.

Returning to FIG. 8A, in S7, a subroutine for normal blur correction calculation is called. FIG. 8B is a flowchart showing a subroutine of normal blur correction calculation.
In S71, angular velocity data is read.
In S72, based on the angular velocity data, the target position calculation of the shake correction group drive mechanism 9 is performed, and the process returns.

In S10, a shake correction driving amount is calculated.
In S11, the blur correction group driving mechanism (unit) is driven.

FIG. 10A is a flowchart showing a translation blur amount calculation subroutine of the image blur correction apparatus 100.
In S661, HPF processing for removing the low frequency component of the acceleration value from the gravitational acceleration component subtraction unit 33 is performed, and in S662, an integral operation is performed.
Similarly, in S663, HPF processing for removing the low frequency component of the velocity value calculated in S662 is performed. In S664, integral calculation is performed to obtain a translational blur amount, and the process returns.

FIG. 10B is a flowchart illustrating a subroutine performed by the translational blur amount calculation unit 35 of the image blur correction device 100 according to the first embodiment.
In S665, HPF processing (HPF2) for removing the low frequency component of the acceleration value from the gravitational acceleration component subtracting unit 33 is performed, and in S666, an integration operation is performed.
Similarly, in S667, HPF processing for removing the low frequency component of the velocity value calculated in S666 is performed (HPF3). Next, in S668, the rotation center position calculation (acceleration sensor position reference N ′) is performed. In S669, the rotation center position calculation (imaging surface position reference N) is performed, and the process returns.

FIG. 11 shows an example of a waveform when a value obtained by averaging ω5 for a predetermined time is used as the initial value V00 in the present embodiment. A dotted line ω 0 ′ is a comparison form shown in FIG. 7, and a broken line ω 0 is a view showing a case of the present embodiment.
As shown in the figure, according to the present embodiment, by using the average value of ω5 as the initial value of HPF1, the HPF calculation (ω0 calculation) can be started from a value closer to the true value. As well as the time required for the translational blurring operation to be stabilized.
During the time when the average value of ω5 is acquired, only the angle blur is corrected, but the translation blur calculation error is reduced as shown in FIG. 11, so that the user feels uncomfortable.

(Second Embodiment)
FIG. 12 is a block diagram of an image blur correction apparatus 200 according to the second embodiment. The image blur correction apparatus 200 according to the second embodiment is obtained by adding an initial value calculation unit 39B and HPF 5 between the acceleration sensor 12A and the gravitational acceleration component subtraction unit 33 of the image blur correction apparatus 100 according to the first embodiment. is there. Since other configurations are the same as those in the first embodiment, the same portions are denoted by the same reference numerals, and the description thereof is omitted.
In the first embodiment, ω5 within a predetermined time from the start of blur correction is averaged to obtain the initial value of HPF1, but in the second embodiment, the output value ω5 of the acceleration sensor 12A is further determined by the initial value calculation unit 39B. The time is averaged and used as the initial value (second initial value) of HPF5.
In the second embodiment, the camera posture calculation unit 31 uses the second initial value calculated by the initial value calculation unit 39B.
Also in the second embodiment, since the HPF calculation (ω0 calculation) can be started from a value closer to the true value, the translation blur calculation error can be reduced and the time required until the translation blur calculation is stabilized. Can be shortened.
During the time when the average value of ω5 is acquired, only the angle blur correction is performed, but the translation blur calculation error is reduced, so that the user feels comfortable.

(Third embodiment)
FIG. 13 is a block diagram of an image blur correction apparatus 300 according to the third embodiment. FIG. 14 is a graph showing the gain with respect to the initial value of the HPF part with time as the horizontal axis.
The image blur correction apparatus 300 according to the third embodiment is obtained by adding a gain adjustment unit 341 between the HPF 2 and the integration circuit of the image blur correction apparatus 200 according to the second embodiment. Since other configurations are the same as those of the second embodiment, the same portions are denoted by the same reference numerals, and the description thereof is omitted.

  In the third embodiment, as shown in the figure, after obtaining the gain for the initial value of the HPF unit, the gain for the acceleration information is gradually increased over a predetermined time 2 (= t2-t1). By adding this process, an unnatural behavior immediately after the start of vibration isolation can be further reduced.

(Deformation)
The present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and these are also within the scope of the present invention.
(1) In this embodiment, a digital single-lens reflex camera has been described. However, the present invention is not limited to this, and can be applied to a compact camera, a silver salt camera, a video camera, a mobile phone, and the like.
(2) The image blur correction device of the present embodiment may be provided in the lens barrel or in the camera body. Alternatively, the lens barrel and the camera body may be provided in a distributed manner.
(3) Although the example of driving the blur correction group has been described, the image sensor may be driven to perform blur correction.

  In addition, although embodiment and a deformation | transformation form can also be used in combination as appropriate, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

  1: Camera, 1A: Camera housing, 1B: Lens barrel, 30: Gravity acceleration correction unit, 31: Camera posture calculation unit, 32: Gravity acceleration component calculation unit, 33: Gravity acceleration component subtraction unit, 34: Translation blur Amount calculation unit, 34a: integration filter, 34b: integration filter, 35: angle blur amount calculation unit, 36: lens target position calculation unit, 37: focus information acquisition unit, 38: lens drive amount calculation unit, 39: initial value calculation Unit, 39B: initial value calculation unit, 100, 200, 300: image blur correction device, 341: gain adjustment unit

Claims (7)

An angular velocity sensor for detecting angular velocity;
An acceleration sensor for detecting acceleration;
An angular blur amount calculation unit for calculating an angular blur amount from the output of the angular velocity sensor;
A translational blur amount calculation unit that calculates a translational blur amount using the output of the angular velocity sensor and the output of the acceleration sensor;
An initial value calculation unit for calculating an initial value used for calculation of the translation blur amount by the translation blur amount calculation unit using an output of the angular velocity sensor;
A drive amount calculation unit for calculating a drive amount of a shake correction optical system using the angular shake amount and the translational shake amount;
In the image blur correction apparatus comprising:
A predetermined time after the start of blur correction by the image blur correction device,
The initial value calculation unit calculates the initial value,
The translation blur amount calculation unit does not perform translation blur correction amount calculation,
The angle blur amount calculation unit calculates the angle blur amount,
The drive amount calculation unit calculates the drive amount of the shake correction optical system using the angular shake amount,
After the predetermined time has elapsed,
The translation blur amount calculation unit performs a translation blur correction amount calculation based on the result obtained from the initial value by the initial value calculation unit,
The angle blur amount calculation unit calculates the angle blur amount,
The drive amount calculation unit calculates the drive amount of the shake correction optical system using the angular shake amount and the translational shake amount;
An image blur correction device characterized by the above. The image blur correction device according to claim 1,
The initial value is
An average value within the predetermined time of the output of the acceleration sensor or the angular velocity sensor;
An image blur correction device characterized by the above. The image blur correction apparatus according to claim 1 or 2,
A gravitational acceleration component calculation unit for calculating a gravitational acceleration component included in the output of the acceleration sensor;
Based on the calculation result of the gravitational acceleration component calculation unit, a gravitational acceleration component subtraction unit that removes the gravitational acceleration component from the output of the acceleration sensor;
A first high-pass filter provided between the angular velocity sensor and the gravitational acceleration component calculation unit,
The initial value calculated by the initial value calculation unit is a first initial value input to a first high-pass filter;
An image blur correction device characterized by the above. The image blur correction device according to any one of claims 1 to 3,
A gravitational acceleration component calculation unit for calculating a gravitational acceleration component included in the output of the acceleration sensor;
Based on the calculation result of the gravitational acceleration component calculation unit, a gravitational acceleration component subtraction unit that removes the gravitational acceleration component from the output of the acceleration sensor;
A second high-pass filter provided between the acceleration sensor and the gravitational acceleration component subtraction unit,
The initial value calculated by the initial value calculation unit is a second initial value input to the second high-pass filter;
An image blur correction device characterized by the above. The image blur correction device according to claim 4,
A camera posture calculation unit that calculates an initial posture of the camera using the second initial value;
An image blur correction device characterized by the above. The image blur correction device according to claim 5,
The translation blur amount calculation unit
A third high-pass filter, a gain adjustment unit, a first integration circuit, a fourth high-pass filter, and a second integration circuit in order;
The gain adjustment unit gradually increases the gain within the predetermined time;
An image blur correction device characterized by the above.   An optical apparatus comprising the image blur correction device according to any one of claims 1 to 6.

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