JP6700826B2 - Image blur correction apparatus, control method thereof, program, and storage medium - Google Patents

Description

  The present invention relates to a technique for assisting follow shots by using an image blur correction device that corrects image blur caused by a camera shake of a photographer.

  The follow shot by a camera is a method of shooting a subject (moving body) at a shutter speed slower than usual while following the subject. According to this method, an image in which the background flows and the subject is still can be obtained. The follower enables the photographer to take a photograph with a sense of speed. However, since the photographing is performed with a relatively long exposure time, it is difficult to match the speed of the subject with the speed of shaking the camera during the exposure period, which is one of the photographing techniques that requires skill.

  In order to easily realize panning, Patent Document 1 discloses a method of detecting a difference between a speed of a subject and a speed of shaking a camera, and correcting a shift amount corresponding to the difference using an image blur correction function. Is disclosed. Immediately before shooting, the angular velocity sensor in the camera detects the panning angular velocity of the camera following the subject. At the same time, the amount of movement of the main subject image on the imaging surface is detected. The angular velocity of the subject is calculated from the detected panning angular velocity and the amount of movement of the subject image on the imaging surface. During the exposure, the image blur correction operation is performed according to the difference amount between the calculated angular velocity of the main subject and the output of the angular velocity sensor in the camera. As a result, the difference in the panning speed between the main subject and the camera and the amount of camera shake are corrected, so that image blurring of the main subject, which is a panning subject, can be suppressed.

JP, 2006-317848, A

  However, in the conventional technique disclosed in the above-mentioned Patent Document 1, the image blur correction function is stopped in order to accurately detect the amount of movement of the subject image on the image plane when following the subject before shooting. ing. Therefore, particularly in a lens having a long focal length, it is difficult to stably hold the main subject within the angle of view due to the influence of camera shake, and as a result, there is a problem that a photo opportunity is missed.

  The present invention has been made in view of the above-mentioned problems, and an object thereof is to stabilize the operation of following a subject before shooting, and to perform an appropriate follow shot assist during shooting. An object is to provide an image stabilization device.

An image blur correction device according to the present invention includes a movement amount detection unit that detects a movement amount of an object on an image plane, an output of a shake detection unit that detects shake of the device before exposure, and an image caused by the shake of the device. In order to correct the blur, the movement of the moving subject is detected by using the output of the position detection unit that detects the position of the image blur correction lens that moves in a direction different from the optical axis and the output of the movement amount detection unit. By using the output of the motion detection means and the output of the shake detection means, the movement direction of the image blur correction lens for preventing the subject from moving on the image plane during exposure. a calculating means for calculating for, with the moving direction of the image blur correction lens calculated by the calculation means, by using the output of said position detecting means, determining means for determining the exposure start timing and the motion detection The means detects the movement of the subject by using the average value of the positions of the image blur correction lens between the frames output by the position detecting means as the output of the position detecting means, and the calculating means determines the image The moving direction of the blur correction lens is calculated by using the difference between the angular velocity data α of the subject, which is the output of the motion detecting means, and the average value β of the angular velocity data calculated by averaging the outputs of the shake detecting means for a predetermined period. It is characterized in that it is calculated .

  According to the present invention, it is possible to provide an image blur correction device that can stabilize the operation of following a subject before shooting and can appropriately assist the follow shot during shooting.

The figure which showed the whole structure of the imaging device which concerns on the 1st Embodiment of this invention. 6 is a flowchart showing the operation of image blur correction control. The figure which showed the shake frequency analysis result at the time of panning. The flowchart which shows operation|movement of follow shot assist control. 6 is a flowchart showing an exposure timing setting operation. The figure which showed the position and movement of the shift lens at the time of exposure start. 9 is a flowchart showing a shift lens driving process when the shutter is fully pressed. 9 is a flowchart showing an exposure timing setting operation according to the second embodiment. FIG. 8 is a diagram showing the position and movement of a shift lens at the start of exposure in the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In each of the embodiments described below, an image pickup apparatus equipped with an image blur correction device that performs image blur correction of a captured image will be exemplified. An image blur correction device that performs image blur correction by drivingly controlling a movable member of an optical system can be mounted on an interchangeable lens for a digital single-lens reflex camera. Further, it can be mounted not only in an image pickup device such as a video camera, a digital camera and a silver salt still camera, but also in an optical device including an observation device such as a binocular, a telescope and a field scope. Therefore, the optical device also constitutes one aspect of the present invention.

(First embodiment)
FIG. 1 is a diagram showing a schematic configuration of an image pickup apparatus according to a first embodiment of the present invention, showing a configuration of a lens-integrated compact camera (hereinafter referred to as camera) having a follow shot assist function. . In the present embodiment, a lens-integrated compact camera will be described as an example, but the present invention is also applicable to a lens-replaceable camera such as a single-lens reflex type camera.

  A camera 100 having an image blur correction function has a zoom lens 102 and a shift lens 103 that enables the image blur correction function in a photographing lens 101. The encoder 104 detects the position of the zoom lens 102, and the output of this encoder 104 allows the focal length of the taking lens 101 to be known. The angular velocity sensor 111 detects a shake of the entire camera and outputs a shake detection signal. The driver 112 drives the shift lens 103. A position sensor (position detection sensor) 113 detects the position of the shift lens 103. The image blur correction is performed on, for example, two axes in the horizontal direction and the vertical direction, but the same control is performed for each of them, and only one axis is shown here for the sake of clarity of the drawing. ..

  A subject image formed by imaging the light that has passed through the taking lens 101 is received by an image sensor 151 such as a CMOS (complementary metal oxide semiconductor) sensor. The image signal output from the image sensor 151 is processed by the analog signal processing circuit 152 and then sent to the camera signal processing circuit 153. The camera signal processing circuit 153 performs development processing of the captured image and records the image on a memory card or the like (not shown). Further, the camera signal processing circuit 153 includes a vector detection unit 171 that detects a motion vector, and detects the movement of the captured image (movement amount detection) based on the image data of a plurality of frames.

  The timing generator (TG) 155 sets the operation timing of the image sensor 151 and the analog signal processing circuit 152. The display unit 156 includes a display device such as a liquid crystal panel (LCD) that monitors an image that the photographer is about to capture with the camera and that displays the captured image. The operation unit 157 includes a power switch, a release switch, a switch for setting whether or not to set the follow shot assist mode, and the like.

  The camera control microcomputer (hereinafter, camera control unit) 154 communicates with the angular velocity sensor 111 to acquire camera shake data, and performs image blur correction control based on this data. Also, vector data is acquired from the vector detection unit 171 in the camera signal processing unit 153, and follow shot assist control is performed. Further, the camera control unit 154 communicates with the camera signal processing circuit 153 to acquire various evaluation value data, and based on the acquired data, AE (auto exposure), WB (white balance), AF (auto focus). It also controls such as. However, in FIG. 1, in order to make the drawing easy to understand, the configurations other than the portions related to the image blur correction control and the follow shot assist control are omitted.

  In the camera control unit 154, the image blur correction amount calculation unit 120 is a portion mainly related to correction of image blur caused by camera shake. A high-pass filter (HPF) 121 whose cutoff frequency can be changed, an integrator 122, and a panning control unit 123 are provided, and an image blur correction amount is calculated based on camera shake data acquired by the angular velocity sensor 111. The panning speed detection unit 130 is a part corresponding to the follow shot assist control, and includes an average value calculation unit 131 that averages the output of the angular velocity sensor 111 for a predetermined period, a difference calculation unit 132, and a simple integration unit 133. The lens drive controller 140 is a part related to the driving of the shift lens 103. The changeover switch 143, the adder 141, the filter 142, and the average value calculation unit 144 that calculates the average value of the output of the position sensor 113 for a predetermined period are provided. Then, according to the output of the filter 142, the shift lens 103 is driven via the driver 112. The follow shot assist control unit 160 includes a histogram creation unit 161, a main subject motion vector detection unit 162, a main subject angular velocity calculation unit 163, an exposure time setting unit 164, and an exposure start timing confirmation unit 165. Then, the angular velocity of the main subject is calculated using the vector data output from the vector detection unit 171 and the average value data of the angular velocity sensor calculated by the panning velocity detection unit 130.

  FIG. 2 is a flowchart regarding the image blur correction control in consideration of the follow shot assist control. Hereinafter, the image blur correction control will be described in detail with reference to FIGS. 1 and 2. The process here is a process before the shutter is fully pressed (SW2 is turned on), that is, before the exposure. The process after the SW2 is turned on will be described later.

  The process of FIG. 2 is performed by an interrupt process, and the interrupt cycle is, for example, 12 kHz. First, angular velocity data is acquired in S201. This is performed by serial communication between the angular velocity sensor 111 and the camera control unit 154, which is synchronized with the interrupt cycle. Next, in S202, HPF processing using the HPF 121 for cutting the DC component (fluctuation component) of the angular velocity data is performed. Then, in step S203, integration processing is performed by the integrator 122, and the drive target value of the shift lens 103 for correcting the image blur is calculated. In S204, the output of the position sensor 113 is acquired. This processing is performed by, for example, an A/D converter built in the camera control unit 154. In S205, a process of calculating a control amount, which is an actual shift lens drive amount, in the adder 141 using the drive target value of the shift lens 103 calculated in S203 and the output of the shift lens position sensor 113 acquired in S204 I do. In S206, the control amount calculated in S205 is filtered using the filter 142, and the control amount filtered in S207 is output to the driver 112 by PWM or the like. The shift lens 103 is driven by the servo control performed in S204 to S207.

  S208 is a process of determining whether the follow shot assist mode or the normal mode is performed, which is determined based on information from the operation unit 157. When the follow shot assist mode is not set, the panning determination is performed by the panning control unit 123 in S209. For example, it is determined whether the panning operation is being performed depending on whether the output of the HPF 121 or the output of the integrator 122 exceeds a predetermined threshold level. If it is determined that the panning operation is in progress, the drive of the shift lens 103 is stopped (the output of the integrator is forcibly stopped) in S212 so that the target value gradually becomes the center position of the movable range of the shift lens 103. Change to. By performing this operation, an inadvertent image blur correction operation is not performed during panning, and problems such as overcorrection do not occur. If it is determined in S210 that panning is not in progress, the output of the integrator 122 is changed to the normal control in S213.

  As described above, the image blur correction operation is stopped during normal panning, but the effects of camera shake also occur during panning. FIG. 3 is a diagram showing the results of frequency analysis of the angular velocity sensor output in each of the Yaw direction and the vertical direction (Pitch) and the output of the angular velocity sensor 111 during panning, that is, when the camera is moved in the horizontal (Yaw) direction. Is. FIG. 3A shows the output of the angular velocity sensor 111. The area of A to A'corresponds to during panning, and the output of the angular velocity sensor in the Yaw direction largely changes due to panning. FIG. 3B shows a result of frequency analysis separately performed for Yaw and Pitch in the regions A to A'in FIG. 3A. As can be seen from this figure, similar camera shake components (301, 302) of 5 to 8 Hz are detected regardless of whether panning is performed or not. That is, especially when shooting on the telephoto side, the influence of camera shake becomes large, and it is difficult to follow the subject during panning. Therefore, when it is determined in S208 that the panning assist mode is set, the panning control unit 123 sets the panning control dedicated to the panning assist in S211. The cutoff frequencies of the HPF 121 and the integrator 122 are changed to cut the low frequency signal of the angular velocity data. For example, by increasing the cutoff frequency of the HPF 121 from about 0.1 Hz at the time of normal control to about 1 Hz, DC fluctuation of the angular velocity sensor output caused by panning is suppressed. As a result, although the shake correction effect in the camera shake band is reduced, it is possible to sufficiently suppress camera shake due to camera shake on the angle of view of the subject, and to improve easing of framing.

  Next, FIG. 4 is a flowchart regarding the follow shot assist control while performing the shake correction. Hereinafter, the follow shot assist control will be described in detail with reference to FIGS. 1 and 4.

  In FIG. 4, when the power of the camera is turned on, initialization is performed in S401. Then, in step S402, image blur correction control is started. By this start, the interruption of the image blur correction control of FIG. 2 starts. Since the present embodiment relates to the follow shot assist in the image blur correction ON state, it is premised that the image blur correction function is always ON. In step S403, it is determined whether the follow shot assist mode is set by the operation unit 157. If the follow shot assist mode is not set, the process proceeds to step S415, and control relating to the set mode is performed.

  When the follow shot assist mode is set, the process proceeds to S404. In step S404, exposure control corresponding to the follow shot assist is performed. Here, in order to increase the vector detection accuracy, the shutter speed is prioritized and a shutter speed of, for example, 1/125 second or more is selected. In S405, the vector data detected by the vector detection unit 171 is acquired, and in S406, the histogram creation unit 161 creates a histogram from the acquired vector data. Next, in S407, the average value calculation unit 131 calculates the average value of the angular velocity data between the frames in which the vectors are detected, and in S408, the average value calculation unit calculates the average value of the shift lens positions between the frames in which the vectors are also detected. It is calculated according to 144. Then, in step S409, the main subject motion vector detection unit 162 determines the main subject vector.

  In the case where the conventional image blur correction operation by the shift lens 103 is not performed, from the detected histogram, for example, the one corresponding to the angular velocity data may be the background, and the one close to 0 may be the main subject. However, when the image blur correction operation is performed, it is necessary to correct the vector value by the amount that the shift lens is moved, and therefore the average value of the shift lens positions is calculated in S408.

  After the vector of the main subject is specified from the vector data in which the shift lens position is added in S409, the main subject angular velocity calculation unit 163 calculates the angular velocity of the main subject in S410. By adding the vector data for the subject, the angular velocity data in the same period as the timing when the vector is acquired, and the shift lens position in consideration of the sign, the angular velocity of the main subject, that is, the camera for stopping the main subject is selected. The angular velocity for panning can be calculated. Then, in step S411, the exposure time setting unit 164 sets the exposure time based on the calculated angular velocity. The exposure time in S411 is determined so that the background flow amount during the follow shot is a predetermined amount.

  Next, in step S412, it is confirmed whether the photographer has fully pressed the shutter (whether SW2 is in the ON state). If SW2 is not ON, the process returns to S403, and if the follow shot assist mode is continued, S404 to S411 are repeated. If SW2 is ON in S412, the exposure start timing confirmation unit 165 confirms whether or not the exposure may be started in S413. The process here is a process of confirming whether or not the correction range of the shift lens 103 operated to perform the assist control is sufficient. When it is confirmed in S413 that the correction range is sufficient, exposure is performed in S414. When shooting is completed (exposure is completed), the process returns to S403 to prepare for the next follow shot assist.

  FIG. 5 is a detailed flowchart of the exposure start confirmation processing performed in S413. By the operation shown in this flow, it is possible to sufficiently obtain the follow shot assist effect while performing the image blur correction. FIG. 6 is a diagram showing the relationship between the actual position of the shift lens 103 and the start of exposure. The exposure start confirmation processing will be described in detail below with reference to FIGS.

  In FIG. 5, in step S601, the angular velocity data α of the main subject calculated by the main subject angular velocity calculation unit 163 is acquired. Next, in step S602, the average value β of the angular velocity data obtained from the average value calculation unit 131 is acquired. Then, in S603, the obtained difference between α and β is calculated, and the driving direction of the shift lens 103 during exposure is known from the result. In S604, the current position of the shift lens 103 is acquired, and in S605, the direction in which the shift lens 103 crosses the center position of the movable range (passing direction) from the current position of the shift lens 103 and the driving direction during exposure. Determine whether to move to. If the shift lens 103 moves so as to cross the center position of the movable range, an exposure start notification is issued in S606. When the moving direction does not cross the center position, the process returns to S604, and the process of checking the position of the shift lens 103 and the motion direction is repeated until the position of the shift lens 103 reaches the position crossing the center.

  FIG. 6 is a diagram showing the position of the shift lens 103 and the exposure start notification timing in an easy-to-understand manner. In FIG. 6, reference numeral 701 is a curve modeling the movement of the shift lens 103 when the image blur is corrected. The horizontal axis represents the position of the shift lens and the vertical axis represents time, and the time advances from top to bottom. The arrow indicated by 702 indicates the driving direction of the shift lens 103 during exposure derived in S603. Reference numeral 704 indicates the entire movable range of the shift lens 103, and reference numeral 703 indicates a shift in which an exposure start notification is issued in S606 when the movement direction of the shift lens 103 at the start of exposure is the direction indicated by 702. The position range of the lens 103 is shown. For example, when the shutter is fully pressed at time A, the shift lens 103 is located at the position A', so that the exposure start notification is issued immediately. On the other hand, when the shutter is fully pressed at time B, the shift lens 103 is at the position B'. At this time, the operations of S604 and S605 wait for the time indicated by the arrow 706, and when the shift lens 103 moves to the position C', that is, at the time C, the exposure start notification is given. As a result, when the exposure is actually started, the correction range of the shift lens 103 is sufficiently obtained. Although the time lag from full-pressing to the start of exposure increases, the frequency of camera shake is 6 to 8 Hz, as can be seen from FIG. 3, and the delay is about 80 msec at the maximum. As described above, by changing the exposure start time according to the position of the shift lens 103, it is possible to sufficiently obtain the correction effect by the follow shot assist.

  Next, FIG. 7 is a flowchart regarding drive control of the shift lens 103 during exposure after the shutter is fully pressed (SW2 is turned on). The operation during exposure will be described below with reference to FIG.

  In FIG. 7, in S501, it is determined whether or not the exposure is started after the shutter is fully pressed. If the exposure has not been started, image blur correction control is performed in S520. When the exposure is started, the previous integration processing output by the integrator 122 is stored in S502. Next, in S503, the output of the angular velocity sensor 111 is acquired, and in S504, it is determined whether or not the follow shot assist mode is set. If the follow shot assist mode is not set, normal image blur correction processing is performed. In S514, it is determined whether or not panning is in progress. If it is in panning, the output of the integrator 122 is fixed to the integrator output stored in S502 in S519. In the case of normal image blur correction control, as described with reference to FIG. 3, the output of the integrator 122 is gradually returned to the center position and the shift lens 103 is centered during panning. However, if the center position is not yet reached at the start of exposure, the output of the integrator is fixed to prevent the movement of the shift lens 103 back to the center position from capturing an image with unexpected movement. If panning is not in progress, in S515, integration processing is performed on the angular velocity data acquired in S503. Here, the reason why the HPF processing, which was performed before the shutter is fully pressed, is not performed in order to avoid the attenuation and phase shift of the low frequency band due to the HPF and to enhance the effect of the image blur correction.

  The reason why the operation of the shift lens is stopped during the panning detection in the normal image blur correction control is to eliminate the adverse effect caused by the large fluctuation of the integrator output, which occurs when the HPF is not passed during the exposure.

  Then, in S516, it is determined whether or not it is immediately after the start of exposure. If it is immediately after the start of exposure, the difference between the integrator output stored in S502 in S517 and the integrator output in S515 is stored as offset data. This offset amount is generated because the HPF is not passed, and by subtracting it from the output of the integrator in S515 in S518, the shift lens position shift is prevented from occurring, and the result is the drive target value of the shift lens. And

  If the follow shot assist mode is set, the process proceeds from step S504 to step S505. In step S505, the difference calculation unit 132 calculates the difference between the angular velocity data of the subject calculated by the subject angular velocity calculation unit 163 and the angular velocity data acquired in step S503. Then, in S506, the output of S505 is simply integrated by the simple integration unit 133. In S507, it is confirmed whether or not it is immediately after the start of exposure. If it is immediately after the start of exposure, the offset is calculated and stored in the same manner as in the normal image blur correction control. Then, in S509, the offset is subtracted from the simple integral output to obtain the drive target value of the shift lens.

  Steps S510 to S513 are necessary for servo control and are the same as steps S204 to S207 in FIG.

  As described above, according to the first embodiment of the present invention, it is possible to sufficiently obtain the assist effect while effecting the image blur correction. As a result, it is possible to facilitate framing, and it is possible to obtain a follow shot image in which the target subject is stationary at the framing position.

  In the present embodiment, the shift lens 103 arranged so as to move in the direction intersecting the optical axis of the taking lens 101 is driven in order to perform image blur correction and follow shot assist. Alternatively, the image sensor may be shift-driven.

(Second embodiment)
Next, a second embodiment of the present invention will be described. In the present embodiment, as compared with the first embodiment, the timing of starting exposure is determined not only by the position of the shift lens, but also by the exposure time at the time of shooting, the focal length, the sensitivity of the shift lens, and the like. This makes it possible to obtain a sufficient assist effect while shortening the time lag from the full-press of the shutter to the start of exposure.

  The configuration of the camera in this embodiment is the same as that of the first embodiment shown in FIG. Further, FIG. 8 is a flowchart regarding the operation of the exposure start timing confirmation unit 165 in the present embodiment. By the operation shown in this flow, it is possible to sufficiently obtain the follow shot assist effect while performing the image blur correction. Further, it is possible to further reduce the time lag at the time of shooting. Hereinafter, the second embodiment of the present invention will be described in detail with reference to FIG.

  In FIG. 8, S801 to S805 are the same processes as S601 to S605 of FIG. 5 in the first embodiment, and therefore description thereof will be omitted. Further, when the shift lens 103 moves in the direction traversing the center position of the movable range in S805, the exposure start notification is issued in S809 as in the first embodiment.

  If the shift lens 103 does not cross the center position of the movable range in S805, the process proceeds to S806. Then, based on the exposure time set by the exposure time setting unit 164, the difference between α (the angular velocity of the subject) and β (the angular velocity of shaking the camera), and the current focal length obtained from the output of the encoder 104, It is predicted how much the shift lens 103 moves during the exposure time. In S807, the range γ in which the shift lens 103 can sufficiently move during the exposure period is calculated from the prediction result of S806. Then, in S808, it is determined whether or not the current position of the shift lens 103 is within the range of γ, and if it is within the range, an exposure start notification is given in S809. If the position of the shift lens 103 is not within the range of γ in S808, the process returns to S804 to repeat the confirmation of the position of the shift lens 103 and the confirmation of the operation direction, and wait until the position of the shift lens 103 is within the range of γ.

  FIG. 9 is a diagram showing the position of the shift lens 103 and the exposure start notification timing in this embodiment in an easy-to-understand manner. Similar to FIG. 6, the horizontal axis represents the position of the shift lens and the vertical axis represents time, and the time advances from top to bottom.

  Reference numeral 901 is a curve modeling the movement of the shift lens 103 when the image blur is being corrected, and the arrow indicated by 902 indicates the drive direction of the shift lens 103 during exposure derived in step S803. Reference numeral 904 indicates the entire movable range of the shift lens 103, and reference numeral 908 indicates the amount of movement of the shift lens 103 during the exposure period predicted in S806. Further, 903 indicates the range of γ calculated in S807 when the moving direction of the shift lens 103 at the start of exposure is the direction indicated by 902.

  For example, when the shutter is fully pressed at time A, the shift lens 103 is located at the position A', so that the exposure start notification is issued immediately. On the other hand, when the shutter is fully pressed at time B, the shift lens 103 is at the position B', which is outside the range of γ at this time. Therefore, the exposure start notification is issued when the shift lens 103 moves to the position C', that is, at the time C after waiting for the time indicated by the arrow 907. As a result, when the exposure is actually started, the correction range by the shift lens 103 can be sufficiently obtained, and the time lag until the start of the exposure can be suppressed as compared with the first embodiment.

  In this embodiment, the exposure start timing is determined by predicting the shift lens movement amount from the exposure time. However, in consideration of the fact that the sensitivity of movement of the shift lens 103 changes depending on the focal length, the area in which exposure can be started immediately is made wider on the wide side with high sensitivity, and is set in advance according to the focal length. You can leave it.

  As described above, according to the second embodiment of the present invention, it is possible to facilitate framing when the follow-up shooting assist effect is obtained while the image blur correction is effective. At the same time, it is possible to shorten the time lag that is expected to occur, and it is possible to obtain a follow shot image more suited to the photographer's intention.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof.

(Other embodiments)
The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program. It can also be realized by the processing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

Reference numeral 101: shooting lens, 102: zoom lens, 103: shift lens, 111: angular velocity sensor, 120: image blur correction amount calculation unit, 130: panning speed detection unit, 131: angular velocity data average value calculation unit, 140: lens drive control Section, 151: image sensor, 153: camera signal processing circuit, 154: camera control section, 160: follow shot assist control section

Claims (11)

Movement amount detection means for detecting the movement amount of the subject on the image plane,
Output of shake detecting means for detecting shake of the apparatus before exposure, position detecting means for detecting a position of an image shake correcting lens moving in a direction different from the optical axis in order to correct an image shake caused by shake of the apparatus And a movement detecting means for detecting the movement of the subject, which is a moving body, by using the output of the moving amount detecting means,
Calculating means for calculating the moving direction of the image blur correction lens for preventing the subject from moving on the image plane during exposure by using the output of the motion detecting means and the output of the shake detecting means;
A determining unit that determines an exposure start timing using the moving direction of the image blur correction lens calculated by the calculating unit and the output of the position detecting unit ;
The motion detection unit detects the motion of the subject by using an average value of the positions of the image blur correction lens between frames output by the position detection unit as an output of the position detection unit,
The calculating unit averages the moving direction of the image blur correction lens, the angular velocity data α of the object output from the motion detecting unit and the output of the shake detecting unit for a predetermined period. An image blur correction device characterized by being calculated using a difference from β . The determination means is configured such that, with respect to the position of the image blur correction lens before the start of exposure, the moving direction of the image blur correction lens calculated by the calculation means passes through the center position of the movable range of the image blur correction lens. The image blur correction device according to claim 1, wherein it is determined that the exposure is started when it is in the direction. The determining means is configured such that, with respect to the position of the image blur correction lens before the start of exposure, the moving direction of the image blur correction lens calculated by the calculating means passes through the center position of the movable range of the image blur correction lens. 2. The image blur correction apparatus according to claim 1, wherein if it is not in the direction, the exposure is started after the image blur correction lens reaches the center position of the movable range. The deciding means is a movement amount of the image blur correction lens during exposure expected from an output of the shake detection means, an output of the motion detection means, and an exposure time, and a position of the image blur correction lens before exposure is started. The image blur correction device according to claim 1, wherein the timing of starting the exposure is changed based on the following. The control means for controlling the image blur correction lens based on the output of the shake detection means before exposure is further provided, and the control means has a filter capable of changing a cutoff frequency. The image blur correction device described.   Further provided is a switching means for switching between the follow shot mode and the normal mode, and when the follow shot mode is set by the switch means, the cutoff frequency of the filter is changed so as to cut a low frequency band. The image blur correction device according to claim 5, wherein: It said moving amount detecting means, the image blur correction device according to any one of claims 1 to 6, characterized in that a vector detection means for detecting a motion vector from an image of a plurality of frames. It said shake detection means, the image blur correction device according to any one of claims 1 to 7, characterized in that an angular velocity sensor. A movement amount detection step of detecting the movement amount of the object on the image plane,
Output of shake detecting means for detecting shake of the apparatus before exposure, position detecting means for detecting a position of an image shake correcting lens moving in a direction different from the optical axis in order to correct an image shake caused by shake of the apparatus And a movement detecting step of detecting the movement of a moving subject by using the output of the moving amount detecting step and the output of the moving amount detecting step,
A calculation step of calculating the moving direction of the image blur correction lens for preventing the subject from moving on the image plane during exposure, using the output of the motion detection step and the output of the shake detection means; ,
The moving direction of the image blur correction lens which is calculated in the calculation step, by using the output of said position detecting means, possess a determination step of determining an exposure start timing, and
In the motion detecting step, the average value of the positions of the image blur correction lens between the frames output by the position detecting unit is used as the output of the position detecting unit to detect the motion of the subject,
In the calculating step, the moving direction of the image blur correction lens is calculated by averaging the angular velocity data α of the object output from the motion detecting step and the output of the shake detecting means for a predetermined period of time. A method for controlling an image blur correction device, characterized in that the calculation is performed using a difference from β . A program for causing a computer to execute each step of the control method according to claim 9 . A computer-readable storage medium storing a program for causing a computer to execute each step of the control method according to claim 9 .

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