JP2015102755A - Shake correction device, lens barrel, and camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shake correction device that can perform accurate reference value correction, and a lens barrel and a camera.SOLUTION: A shake correction device 100 of the present invention includes a first imaging unit 4 that photographs recording images, a second imaging unit 16 that photographs images used for photometric calculation and is different from the first imaging unit 4, and a motion vector calculation unit 41 that calculates motion vector by using the output of the second imaging unit 16 and outputs the motion vector to a control unit 2A performing control to correct image shake.

Description

  The present invention relates to a shake correction device, a lens barrel, and a camera.

There is a technique for performing optical image stabilization based on a signal from an angular velocity sensor (gyro). In this technique, it is necessary to accurately obtain the reference value (gyro output value at 0 deg / s) of the angular velocity sensor, but the reference value of the angular velocity sensor changes depending on drift characteristics immediately after startup, temperature characteristics, and the like. It is difficult to find accurately.
Therefore, a technique has been proposed in which the output signal of the angular velocity sensor is calculated by LPF (low-pass filter) processing, and the reference value is corrected using motion vector information (see Patent Document 1).

Japanese Patent No. 4419466

However, in a conventional single-lens reflex type camera (with a mirror), it is usually impossible to detect a motion vector because an image is not formed on the image sensor before taking a still image.
In addition, in a single-lens reflex camera equipped with a half mirror, a motion vector can be detected using an imaging element before still image shooting, but detection during still image shooting cannot be performed.
An object of the present invention is to provide a shake correction device, a lens barrel, and a camera capable of correcting a reference value before and after taking a still image.

The present invention solves the above problems by the following means.
The invention according to claim 1 is a first imaging unit that captures a recorded image, a second imaging unit that is different from the first imaging unit that captures an image used for photometric calculation, and an output of the second imaging unit. And a motion vector calculation unit that outputs the motion vector to a control unit that performs control to correct a motion blur by calculating a motion vector.
The invention according to claim 2 is the shake correction apparatus according to claim 1, wherein the angular velocity sensor that detects angular velocity, the output signal of the angular velocity sensor, and the motion vector output from the motion vector calculation unit. And a control unit that performs control to correct image blur using the image blur correction apparatus.
The invention according to claim 3 is the shake correction apparatus according to claim 1 or 2, wherein the reference value calculation unit that calculates a reference value of an output signal of the angular velocity sensor, and the motion vector are used. A reference value correction unit that corrects a reference value, and the control unit performs control to correct image blur using a target position calculated using the output signal of the angular velocity sensor and the corrected reference value. This is a shake correction apparatus characterized by the above.
The invention described in claim 4 is characterized in that the blur correction device according to any one of claims 1 to 3 and the second imaging unit have a frame rate higher than that of the first imaging unit. This is a shake correction device.
According to a fifth aspect of the present invention, in the blur correction device according to the fourth aspect, a first path for guiding subject light to the first imaging unit, and a second path for guiding the subject light to the second imaging unit. A blur correction apparatus including a separation unit that separates a path.
The invention according to claim 6 is the shake correction apparatus according to claim 5, wherein the separation unit is a quick return mirror, and the quick return mirror blocks a subject optical path to the first imaging unit. In this state, the motion vector calculation unit calculates the motion vector based on the image captured by the second imaging unit.
The invention according to claim 7 is the shake correction apparatus according to claim 5 or 6, wherein the separation unit is in a state of being retracted from a subject optical path to the first imaging unit, and the first imaging unit is When performing moving image shooting, the motion vector calculation unit calculates the motion vector from an image captured by the first imaging unit.
The invention according to claim 8 is the shake correction apparatus according to claim 5, wherein the separation unit is a half mirror, and the first imaging unit is a still image using subject light transmitted through the half mirror. When taking a picture, the motion vector computing unit computes the motion vector from an image captured by the second imaging unit.
A ninth aspect of the present invention is the blur correction device according to any one of the fifth to eighth aspects, wherein at least one of a shake correction optical system that corrects image blur and the first imaging unit is provided. The blur correction apparatus includes a drive unit that drives, and the control unit performs control to correct image blur by controlling the drive unit.
According to the tenth aspect of the present invention, a motion vector is calculated using a reference value calculation unit that calculates a reference value of an output signal of an angular velocity sensor that detects an angular velocity, and an output of a photometric sensor that captures an image used for photometry calculation. Using a motion vector calculation unit, a reference value correction unit that corrects the reference value using the motion vector, and a target position calculated using the output signal of the angular velocity sensor and the corrected reference value And a control unit that performs control for correcting image blur.
An eleventh aspect of the invention is the shake correction apparatus according to the tenth aspect of the invention, in which it is determined whether the specific subject is a dynamic subject based on an image captured by the photometric sensor, and the motion The blur correction device is characterized in that the reference value correction unit does not correct the reference value when the subject is a subject.
The invention according to claim 12 is the shake correction apparatus according to claim 10, wherein it is determined whether or not the subject is panned based on an image captured by the photometric sensor, When the panning is performed, the reference value correction unit does not correct the reference value.
In addition, the said structure may be improved suitably, and at least one part may substitute for another structure.

  According to the present invention, it is possible to provide a shake correction device, a lens barrel, and a camera that can correct a reference value before and after taking a still image.

It is sectional drawing which shows typically a camera provided with the blurring correction apparatus. It is a block diagram of a shake correction apparatus. It is the flowchart which showed the flow of operation | movement of a blurring correction apparatus. It is a figure explaining a reference value calculating part, (a) is a reference value calculating part, (b) is a figure showing LPF of a reference value calculating part. It is a flowchart which shows a reference value correction calculation. It is a figure explaining the outline of the operation timing of this embodiment. FIG. 4A is a graph showing a reference value obtained by correcting the value of V4 ′ in FIG. 4B, and FIG. 4B is a graph showing the direction of the second motion vector MV2. It is the graph which compared the case where correction | amendment with respect to a reference value (solid line) and the case where correction | amendment with respect to a reference value is not performed (dotted line), (a) shows a calculation error, (b) is an image surface blurring amount. Indicates. It is the graph which compared the image plane blurring amount during exposure. It is an operation | movement timing of 2nd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings and the like.
FIG. 1 is a cross-sectional view schematically showing a camera 1 including the shake correction apparatus of the first embodiment.
In FIG. 1, illustration and description of devices and circuits of the camera 1 that are not directly related to the present embodiment are omitted.
In the camera 1 of the present embodiment, the lens barrel 1B is attached to the camera body 1A in a replaceable manner.
The camera body 1A is provided with a first image sensor 4 for capturing a subject image and recording the image. The first image sensor 4 can be constituted by a CCD, a CMOS, or the like. At the time of photographing, the quick return mirror 5 and the sub mirror 6 are retracted to a position outside the photographing optical path indicated by a solid line, the shutter 7 is opened, and a subject image is formed on the light receiving surface of the first image sensor 4 by the photographing optical system of the lens barrel 1B. Imaged.

At the bottom of the camera body 1A, a focus detection optical system 9 and a distance measuring element 10 for detecting the focus adjustment state of the lens barrel 1B are provided. In this embodiment, an example in which a focus detection method based on a pupil division type phase difference detection method is employed is shown.
The focus detection optical system 9 guides the pair of focus detection light beams that have passed through the lens barrel 1B to the light receiving surface of the distance measuring element 10, and forms a pair of optical images.
The distance measuring element 10 includes, for example, a pair of CCD line sensors, and outputs a focus detection signal corresponding to the pair of optical images. Prior to shooting, the quick return mirror 5 and the sub mirror 6 are set at positions in the shooting optical path as indicated by broken lines, and the pair of focus detection light beams from the lens barrel 1B pass through the half mirror portion of the quick return mirror 5. The light is transmitted, reflected by the sub-mirror 6, and guided to the focus detection optical system 9 and the distance measuring element 10.

  A finder optical system is provided above the camera body 1A. Before shooting, the quick return mirror 5 and the sub mirror 6 are in positions indicated by broken lines, and the subject light from the lens barrel 1B is reflected by the quick return mirror 5 and guided to the focusing screen 11, and the subject image on the focusing screen 11 Forms an image.

  The liquid crystal display element 12 superimposes and displays information such as a focus detection area mark on the subject image formed on the focusing screen 11 and displays various photographing information such as an exposure value at a position outside the subject image. The subject image on the focusing screen 11 is guided to the eyepiece window 15 via the penta roof prism 13 and the eyepiece lens 14 so that the photographer can visually recognize the subject image.

  In addition, the finder optical system at the top of the camera body 1A is provided with a second image sensor 16 that captures a subject image for photometry (subject tracking). The subject image formed on the focusing screen 11 is re-imaged on the light receiving surface of the second image sensor 16 via the penta roof prism 13, the prism 17 and the imaging lens 18. The second image sensor 16 outputs an image signal corresponding to the subject image.

  The subject image formed on the focusing screen 11 before photographing is guided to the second image sensor 16 via the penta roof prism 13, the prism 17 and the imaging lens 18, and the subject image is formed on the light receiving surface of the second image sensor 16. Is re-imaged.

The camera body 1A is also provided with a camera CPU 2A, an operation member 20, and the like.
The camera CPU 2 </ b> A is composed of peripheral components such as a microcomputer, a memory, and an A / D converter, the details of which will be described later, and performs various controls and calculations of the camera 1.
The operation member 20 includes a switch and a selector for operating the camera 1 such as a shutter button, a focus detection area selection switch, and a shooting mode selection switch.
Further, the camera body 1A includes a connection unit 23 that can communicate with a lens CPU 2B and an angular velocity sensor 52, which will be described later.

  The lens barrel 1B includes a zoom lens group 54, a focus lens group 55, a shake correction lens group (optical element) 56, a zoom lens group drive mechanism 57, a focus lens group drive mechanism 58, and a shake correction lens group drive mechanism (optical element drive). Part) 59, an aperture 50, an aperture drive mechanism 51, an angular velocity sensor 52, and a lens CPU 2B.

  The lens CPU 2B calculates the movement amount of the lens group such as the zoom lens group 54, the focus lens group 55, and the blur correction lens group 56. The zoom lens group drive mechanism 57, the focus lens group drive mechanism 58, the shake correction lens group drive mechanism 59, and the aperture drive mechanism 51 are instructed to move the zoom lens group 54, the focus lens group 55, and the shake correction lens group 56. Move.

The zoom lens group 54 is a lens group that is driven by the zoom lens group driving mechanism 57 and moves along the optical axis direction to continuously change the magnification of the image.
The focus lens group 55 is a lens group that is driven by the focus lens group drive mechanism 58 and moves in the optical axis direction to focus.
The shake correction lens group 56 (optical element) is a lens group that is optically shake-corrected by a shake correction lens group drive mechanism 59 such as a VCM and is movable on a plane perpendicular to the optical axis.

The diaphragm 50 is a mechanism that is driven by the diaphragm drive mechanism 51 and controls the amount of subject light passing through the photographing lenses (54, 55, 56).
Each of the angular velocity sensors 52 is a sensor that detects an angular velocity of a shake that occurs in each sensor unit.

FIG. 2 is a block diagram of the shake correction apparatus 100 of the present embodiment.
The shake correction apparatus 100 includes a second image sensor 16, a first camera CPU 2A, a lens CPU 2B, an angular velocity sensor 52, a shake correction lens group drive mechanism (lens drive unit) 59, a lens position detection unit 21, and a shake correction lens group 6. Prepare.

The camera CPU 2A includes a signal processing unit 40 and a motion vector calculation unit 41.
The lens CPU 2B includes an amplification unit 31, a first A / D conversion unit 32, a second A / D conversion unit 33, a reference value calculation unit 34, a reference value correction amount calculation unit 35, and a target position calculation unit 36 including an integration unit therein. A center bias calculator 37, a center bias remover 38, and a drive amount calculator 39.
The angular velocity sensor 52 is a sensor such as a vibration gyro that detects angular velocities around the X axis (Pitch), Y axis (Yaw), and Z axis (Roll) of the lens barrel 1B.

The amplifying unit 31 amplifies the output of the angular velocity sensor 52.
The first A / D converter 32 performs A / D conversion on the output of the amplifier 31.
The reference value calculation unit 34 calculates the reference value of the vibration detection signal (output of the first A / D conversion unit 32) obtained from the angular velocity sensor 52.
Then, the reference value calculated by the reference value calculation unit 34 is subtracted from the output of the first A / D conversion unit 32 by the subtraction unit 43.
The target position calculation unit 36 calculates the target position of the blur correction lens group 6 based on the output of the angular velocity sensor 52 after the reference value is subtracted by the subtraction unit 43.

The center bias calculation unit 37 biases the centripetal force for moving the image blur correction lens 6 toward the center of the movable range based on the target position of the image blur correction lens 6 calculated by the target position calculation unit 36. Calculate as a quantity.
Then, the control position of the image blur correction lens 6 is calculated by subtracting the calculated bias amount from the target position of the image blur correction lens 6.
By performing the centering bias processing in this way, it is possible to effectively prevent the image blur correction lens 6 from colliding with the hard limit, and it is possible to improve the appearance of the captured image.

  The drive amount calculation unit 39 is a blur correction lens group obtained from the target position from the target position calculation unit 36 and the value detected by the lens position detection unit 21 and A / D converted by the second A / D conversion unit 33. 6, the driving amount of the blur correction lens group driving mechanism 59 is calculated.

The image sensor 3 is provided on the planned focal plane of the photographing optical system. The image pickup device 3 is composed of a device such as a CCD or a CMOS, and generates an analog image signal by photoelectrically converting an input subject image.
The signal processing unit 40 performs predetermined processing on the image signal generated by the image sensor 3.

The motion vector calculation unit 41 calculates a motion vector (first motion vector) indicating the motion of the image (motion direction, amount of motion) from the captured image processed by the signal processing unit 40.
Specifically, the motion vector calculation unit 41 detects the motion direction and the motion amount of the image by comparing the luminance information included in two consecutive frame image data captured by the image sensor 3. Calculate the motion vector.

The center bias removing unit 38 is a bias amount calculated by the center bias calculating unit 37 (subtracted from the target position of the image blur correction lens 6) from the first motion vector (MV1) that is the output of the motion vector calculating unit 41. Is subtracted.
The reference value correction amount calculation unit (reference value correction unit) 35 calculates a reference value correction amount based on the second motion vector (MV2) from which the center bias amount has been removed by the center bias removal unit 38.
Then, the subtraction unit (reference value correction unit) 42 subtracts the reference value correction amount obtained by the reference value correction amount calculation unit 35 from the output of the reference value calculation unit 34.

Next, an operation flow of the shake correction apparatus 100 according to the present embodiment will be described.
FIG. 3 is a flowchart showing an operation flow of the shake correction apparatus 100 of the present embodiment.

  After the camera 1 is turned on, the shake correction apparatus 100 starts a calculation for optical image stabilization. Depending on the camera, when the half-push switch is pressed, the shake correction apparatus 100 starts computation for optical image stabilization (step S001).

After the output of the angular velocity sensor 52 is amplified by the amplification unit 31, it is A / D converted by the first A / D conversion unit 32 (step S002).
Based on the signal after A / D conversion of the output of the angular velocity sensor 52, the reference value calculation unit 34 calculates a reference value (a value corresponding to zero deg / s) of the calculated angular velocity. Since the reference value of the angular velocity changes depending on the temperature characteristic, the drift characteristic immediately after startup, and the like, for example, the stationary output of the angular velocity sensor 52 at the time of factory shipment cannot be used as the reference value.

  As a method for calculating the reference value, a method of calculating a moving average for a predetermined time and a method of calculating by LPF processing are known. In the present embodiment, reference value calculation by LPF processing is used.

  4A and 4B are diagrams for explaining the reference value calculation unit 34. FIG. 4A shows the reference value calculation unit 34 (HPF), and FIG. 4B shows the LPF 34a of the reference value calculation unit 34. .

  The cut-off frequency fc of the LPF 34 is generally set to a low frequency of about 0.1 [Hz]. This is because camera shake has a dominant frequency of about 1 to 10 [Hz]. If the fc is 0.1 [Hz], there is little influence on the camera shake component, and good blur correction can be performed.

  However, during actual shooting, low-frequency motion such as fine adjustment of the composition (a level at which panning cannot be detected) is added, which may cause an error in the ω0 calculation result. In addition, since fc is low (time constant is large), there is a problem that it takes time to converge to a true value when the error is once increased. In the present embodiment, this ω0 error is corrected.

Returning to FIG. 3, when the information of the first motion vector MV1 is updated (S004, YES), the process proceeds to S005, and when it is not updated (S004, NO), the process proceeds to S006. The description of S004 to S005 will be described later in detail.
In addition, since information on the first motion vector MV1 cannot be obtained during exposure, this step is performed until immediately before the exposure.
The outputs of the angular velocity sensor 52 after subtracting the reference value are integrated, and the target position of the blur correction lens group 6 is calculated based on the focal length, subject distance, photographing magnification, and blur correction lens characteristic information (S006).
Center bias processing is performed to prevent the blur correction lens group 6 from reaching the movable end (S007).

  There are various center bias processing methods such as a method of setting a bias amount according to target position information, HPF processing, incomplete integration processing (in S006), and the method is not limited here.

The lens driving amount is calculated from the difference between the target position information including the center bias component and the blur correction lens position information (S008).
The blur correction lens group 6 is driven to the target position (S009), and the process returns to S002.

Next, reference value correction (S004 to S005, S011 to S016) will be described. FIG. 5 is a flowchart showing the reference value correction calculation.
As described above, when the information of the first motion vector MV1 is updated (S004), the process proceeds to S005. If it has not been updated, the process proceeds to S006.
Since the optical blur correction control cycle is sufficiently early with respect to the MV1 update cycle, the same arithmetic processing as normal image stabilization is performed until the MV1 is updated. Here, it is assumed that the control period of optical blur correction is 1 [ms] and the update period of the first motion vector MV1 is 33 [ms] (= 30 [fps]). A well-known technique is used for the calculation method of the first motion vector MV1.

All the received first motion vectors MV1 are summed (S011).
The center bias component calculated in S007 is converted to the same scale as the first motion vector MV1 (S012).
The conversion method is calculated based on the focal length, the subject distance, the shooting magnification, and the resolution information of the first motion vector MV1.
Bias_MV = Bias_θ * f1 + β / MV_pitch

Bias_MV: Center bias component (same motion vector scale)
Bias_θ: Center bias component (angle)
f: Focal length β: Image magnification MV_pitch: MV1 pitch size

  In addition, since a delay time occurs until the first motion vector MV1 is detected, it is preferable that the center bias component also has a delay time equivalent to that of the first motion vector MV1. For example, if there is a delay time of 3 frames at 30 [fps], the delay is about 100 [ms]. Therefore, the center bias component included in the first motion vector MV1 can be calculated more accurately by using the bias information before 100 [ms].

The center bias component calculated in S012 is subtracted from the first motion vector MV1 (S013). Thereby, the information of the second motion vector MV2 due to the reference value error can be acquired.
A difference: MV_diff between the latest second motion vector MV2 (n) and the second motion vector MV2 (n-1) one frame before is acquired (S014).
An amount for correcting the reference value is set based on MV_diff. As the reference value, a correction amount is set based on the following idea (S015).

MV_diff> 0: ω0_comp = −ω0_comp_def
MV_diff <0: ω0_comp = + ω0_comp_def
MV_diff = 0: ω0_comp = 0

ω0_comp: reference value correction amount ω0_comp_def: reference value correction constant

  Ω0_comp calculated in S015 is subtracted from the reference value calculated in S003 (S016). Specifically, the value of V4 ′ in FIG. 4B is corrected.

  Next, the outline of the operation timing of this embodiment will be described with reference to FIG. When the shutter button (operation member) 20 is pressed, a half-press signal is generated, and the image stabilization operation is started (calculation of the reference value of the angular velocity sensor is also started).

  At the same time, the calculation of the motion vector MV is started from the subject image on the second image sensor 16, and the correction of the reference value by the motion vector MV is also started.

Next, when the release button 20 is further pushed down and fully pressed, a trigger signal is generated, the acquisition of the motion vector MV is finished, and the correction of the reference value is finished.
Then, a series of photographing operations such as mirror up, shutter drive (open), exposure, shutter drive (close), and mirror down are performed.

FIG. 7A is a graph showing a reference value obtained by correcting the value of V4 ′ in FIG. A dotted line in the figure indicates a reference value when correction is not performed according to the present embodiment, and a solid line in the figure indicates a reference value when correction is performed according to the present embodiment.
FIG. 7B is a graph showing the direction of the second motion vector MV2. For example, when the second motion vector MV2 is in the plus direction as shown at time t1 in FIG. 7B, the reference value is corrected to minus as shown in (a).

Thereafter, the reference value changes according to the value calculated by the reference value calculation unit 34 until time t3.
When the second motion vector MV2 is confirmed in the positive direction at time t3, the reference value is corrected to a negative value. In the present embodiment, the correction amount at this time is constant as at time t1.
Thereafter, the reference value changes according to the value calculated by the reference value calculation unit 34 between the times when the second motion vector MV2 is confirmed.
When the second motion vector MV2 is confirmed in the positive direction, the reference value is corrected to a certain amount minus.
Further, when the second motion vector MV2 is confirmed in the minus direction at times t22 and t25 in the figure, the reference value is corrected to a certain amount plus.

  By correcting the reference value as described above, as shown in FIG. 7A, the correction value can take a value close to the true value.

  FIG. 8 is a graph comparing the case where the correction with respect to the reference value according to the present embodiment is performed (solid line) and the case where the correction with respect to the reference value is not performed (dotted line). (A) shows the calculation error, and (b) shows the image plane blurring amount. As shown in the figure, according to the present embodiment, the calculation error for the true value is reduced. In addition, when the correction is performed on the reference value, the image plane blurring amount is reduced as compared with the case where the correction on the reference value is not performed.

  FIG. 9 is a graph comparing image plane blurring amount during exposure. In the figure, the case where the blur correction is not performed is indicated by a broken line, and the case where the correction according to the present embodiment is performed is indicated by a one-point difference line.

The correction of the reference value using the second motion vector MV2 is only during the exposure preparation period (during half-press vibration isolation and during moving image shooting), and normal reference value calculation is performed during exposure.
As shown in the figure, according to the present embodiment, the reference value correction is performed only during the exposure preparation period, but the exposure can be started in a state where the reference value immediately before the exposure is closer to the true value. In this case, it is possible to perform good blur correction.

As described above, according to the present embodiment, in a single-lens reflex camera, a motion vector can be detected from an image (reflected by a mirror) using a photometric sensor. By using the motion vector for correcting the reference value of the angular velocity sensor, it is possible to achieve high accuracy of the reference value of the angular velocity sensor.
The frame rate of the second image sensor 16 used for photometry is 240 to 960 fps, and the frame rate of the first image sensor 4 is 30 to 60 fps. In the present embodiment, since the motion vector is obtained by the second image sensor 16, the motion vector can be obtained with higher accuracy.
Since the number of pixels of the second image sensor 16 is about 1/100 compared to the first image sensor 4, the calculation time is shortened compared to the case of obtaining a motion vector using the image of the first image sensor 4. .

(Second embodiment)
The second embodiment is an embodiment in which the mirror 5 shown in FIG. 1 is a half mirror. FIG. 10 shows the operation timing of the second embodiment. Since the second embodiment is the same as the first embodiment except that the mirror 5 shown in FIG. 1 is a half mirror, description of similar parts is omitted.
When the shutter button of the operation member 20 is pressed, a half-press signal is generated and the image stabilization operation is started (calculation of the gyro reference value is also started). At the same time, calculation of the motion vector MV is started from the subject image on the second image sensor 16, and correction of the gyro reference value by the motion vector MV is also started.

Next, when the release button 20 is further pushed down to a fully depressed state, a trigger signal is generated, and a series of photographing operations including shutter driving (opening), exposure, and shutter driving (closing) is performed.
Since the present embodiment is a half mirror, the motion vector MV can be calculated from the second image sensor 16 even during still image shooting, and the gyro reference value can be corrected by the motion vector MV, regardless of the shutter state. Therefore, more accurate blur detection is possible.
In addition, a single-lens reflex camera equipped with a half mirror can also detect a motion vector during still image shooting, and the motion vector can be used for correcting the reference value of the gyro even during still image shooting. It is possible to correct the reference value of the gyro.

(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 the present embodiment, the mode of performing the blur correction by moving the blur correction lens group has been described, but the present invention is not limited to this. For example, blur correction may be performed by moving the image sensor, or blur correction may be performed by moving the blur correction lens group and the image sensor.

(2) The camera CPU 2A determines whether the subject is a dynamic subject based on the image captured by the photometry unit. If the subject is a dynamic subject, the camera CPU 2A stops the feedback of the motion vector, and the reference value It is preferable to stop the update. This is because in the case of a dynamic subject, it is difficult to detect a motion vector due to camera shake.

(3) The camera CPU 2A determines whether or not the subject has been panned based on the image captured by the photometry unit. If the subject has been panned, the camera CPU 2A stops the feedback of the motion vector, and the reference value It is preferable to stop updating. This is because in the case of panning, it is difficult to detect a motion vector due to camera shake.
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.

  1A: camera body, 1B: lens barrel, 2A: camera CPU, 2B: lens CPU, 4: first image sensor, 5: quick return mirror, 16: second image sensor, 17: prism, 20: release button, 20: operation member, 21: lens position detection unit, 23: connection unit, 34: reference value calculation unit, 35: reference value correction amount calculation unit, 36: target position calculation unit, 37: center bias calculation unit, 38: center Bias removal unit, 39: drive amount calculation unit, 40: signal processing unit, 41: vector calculation unit, 43: subtraction unit, 52: angular velocity sensor, 56: blur correction lens group, 59: blur correction lens group drive mechanism, 100 : Shake correction device

Claims (12)

A first imaging unit for imaging a recorded image;
A second imaging unit different from the first imaging unit that captures an image used for photometric calculation;
A blur correction apparatus comprising: a control unit that calculates a motion vector using an output of the second imaging unit and performs control for correcting image blur; and a motion vector calculation unit that outputs the motion vector. The shake correction apparatus according to claim 1,
An angular velocity sensor for detecting angular velocity;
A blur correction apparatus comprising: a control unit that performs control to correct image blur using an output signal of the angular velocity sensor and the motion vector output from the motion vector calculation unit. The shake correction apparatus according to claim 1 or 2,
A reference value calculation unit for calculating a reference value of the output signal of the angular velocity sensor;
A reference value correction unit that corrects the reference value using the motion vector;
The blur correction apparatus, wherein the control unit performs control to correct image blur using a target position calculated using the output signal of the angular velocity sensor and the corrected reference value. The blur correction device according to any one of claims 1 to 3,
The blur correction device, wherein the second imaging unit has a higher frame rate than the first imaging unit. The blur correction device according to claim 4,
A blur correction apparatus comprising: a separation unit that separates a subject path into a first path that guides the subject light to the first imaging unit and a second path that guides the subject light to the second imaging unit. The shake correction apparatus according to claim 5,
The separation part is a quick return mirror,
When the quick return mirror is in a state of blocking the subject optical path to the first imaging unit,
The motion correction apparatus according to claim 1, wherein the motion vector calculation unit calculates the motion vector from an image captured by the second imaging unit. The shake correction apparatus according to claim 5 or 6,
When the separation unit is retracted from the subject optical path to the first imaging unit and the first imaging unit is shooting a moving image, the motion vector calculation unit is captured by the first imaging unit. A blur correction apparatus that calculates the motion vector from an image. The shake correction apparatus according to claim 5,
The separation unit is a half mirror,
When the first imaging unit is performing still image shooting with subject light transmitted through the half mirror,
The motion correction apparatus according to claim 1, wherein the motion vector calculation unit calculates the motion vector from an image captured by the second imaging unit. The blur correction device according to any one of claims 5 to 8,
A shake correction optical system that corrects image blur, and a drive unit that drives at least one of the first imaging unit,
The blur correction apparatus, wherein the control unit performs control to correct image blur by controlling the driving unit. A reference value calculation unit for calculating the reference value of the output signal of the angular velocity sensor for detecting the angular velocity;
A motion vector computing unit that computes a motion vector using an output of a photometric sensor that captures an image used for photometric computation;
A reference value correction unit that corrects the reference value using the motion vector;
A blur correction apparatus comprising: a control unit that performs control for correcting image blur using a target position calculated using the output signal of the angular velocity sensor and the corrected reference value. The shake correction apparatus according to claim 10,
Based on the image captured by the photometric sensor, it is determined whether the specific subject is a dynamic subject.If the specific subject is the dynamic subject, the reference value correction unit does not correct the reference value. A blur correction device characterized by the above. The shake correction apparatus according to claim 10,
Based on the image captured by the photometric sensor, it is determined whether or not the subject has been panned. If the subject has been panned, the reference value correction unit does not correct the reference value. A blur correction device characterized by the above.

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