JP2017134185A - Image blur correction apparatus, imaging apparatus, lens apparatus, image blur correction apparatus control method, program, and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image blur correction device capable of easily acquiring a shot image with presence.SOLUTION: The image blur correction device includes: calculation means (281) that calculates a motion vector of a subject included in an image; acquisition means (280) that acquires a focus distance; and control means (282) that controls exposure time on the basis of the motion vector of the subject and a piece of shake information and a focus distance detected by detection means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image blur correction apparatus that corrects an image blur caused by camera shake or the like, and more particularly to an image blur correction apparatus having an assist function during panning shooting.

  2. Description of the Related Art Conventionally, an imaging device capable of performing panning shooting is known. Panning shot is when the subject is moving at a certain speed, the background is flowing and the subject is stopped by panning the imaging device according to the movement of the subject and exposing with a longer exposure time than usual. This is a technique for capturing such an image. Also, a method using an image blur correction device is known in order to enable such a panning shot to be easily performed.

  Patent Document 1 discloses an image shake correction apparatus that matches the amount of movement of a subject image on an imaging surface with the output timing of a shake detection unit to increase the detection accuracy of angular velocity related to the subject. Patent Document 2 discloses a photographing apparatus that determines a shutter speed used when photographing subject light with an image sensor based on an angular velocity and a focal length.

Japanese Unexamined Patent Publication No. 2015-161730 JP2015-102774A

  However, Patent Document 1 does not disclose an assist function for setting an exposure time for panning. For this reason, it is difficult for a photographer unfamiliar with panning shot shooting to calculate an appropriate exposure time for obtaining an intended sink amount. The imaging device disclosed in Patent Document 2 does not consider variations in speed within the same subject. For example, when shooting a running animal, a part of the subject may flow and be shot depending on the setting. This phenomenon occurs when there is a fast-moving part in the subject and a long exposure time is set for the speed of movement of that part. The feeling may be impaired.

  Therefore, the present invention provides an image blur correction device, an imaging device, a lens device, a control method for the image blur correction device, a program, and a storage medium that can easily obtain a panoramic image with a sense of reality.

  An image blur correction apparatus according to one aspect of the present invention is detected by a calculation unit that calculates a motion vector of a subject included in an image, an acquisition unit that acquires a focal length, the motion vector of the subject, and a detection unit. Control means for controlling the exposure time based on shake information and the focal length.

  An image pickup apparatus according to another aspect of the present invention includes an image pickup element that photoelectrically converts an optical image formed through an image pickup optical system and outputs image data, and the image blur correction apparatus.

  A lens apparatus according to another aspect of the present invention includes an imaging optical system and the image blur correction apparatus.

  According to another aspect of the present invention, there is provided a control method for an image blur correction device of an image blur correction device, a step of calculating a motion vector of a subject included in an image, a step of detecting shake information, and a step of acquiring a focal length. And controlling the exposure time based on the motion vector of the subject, the shake information, and the focal length.

  Other objects and features of the invention are described in the following embodiments.

  According to the present invention, it is possible to provide an image blur correction device, an imaging device, a lens device, a control method for the image blur correction device, a program, and a storage medium that can easily obtain a panoramic image with a sense of reality. .

5 is a flowchart illustrating a method for controlling the imaging apparatus according to the present embodiment. It is a block diagram of the imaging device in this embodiment. It is a block diagram of a camera shake correction control unit in the present embodiment. It is explanatory drawing of each axis | shaft and direction of the imaging device in this embodiment. It is explanatory drawing of the motion vector in this embodiment. 5 is a flowchart illustrating a method for calculating the driving amount of the image blur correction lens according to the present embodiment. It is a flowchart which shows the exposure control method in this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, the configuration and operation of the imaging apparatus according to the present embodiment will be described with reference to FIG. FIG. 2 a is a block diagram of the imaging apparatus 201. In FIG. 2 a, the optical unit 210 (imaging optical system) includes a zoom lens 211, an image blur correction lens 212, a focus adjustment lens 213, a diaphragm 214, and a shutter 215. The lens drive control unit 220 is control means for driving each component of the optical unit 210. The lens drive control unit 220 includes a zoom control unit 221, a camera shake correction control unit 222, a focus control unit 223, an aperture control unit 224, and a shutter control unit 225.

  The image sensor 231 photoelectrically converts an optical image formed via the optical unit 210 and outputs an analog image signal (image data). The operation timing of the imaging element 231 is controlled by the imaging control unit 232. The A / D converter 233 converts the analog image signal output from the image sensor 231 into a digital image signal. The digital image signal output from the A / D converter 233 is stored in the internal memory 243 via the image input unit 234. The image input unit 234 is controlled by the memory control circuit 241. The internal memory 243 is controlled by the system controller 280. The image processing unit 251 performs predetermined pixel interpolation processing, color conversion processing, and the like on the data (digital image data) from the A / D converter 233 or the data from the memory control circuit 241. The memory control circuit 241 controls the A / D converter 233, the image processing unit 251, the compression / decompression circuit 242, and the internal memory 243. The memory control unit 214 controls data recording on the recording medium 244.

  The display image data written in the internal memory 243 is displayed on the image display unit 206 such as a TFT or LCD via the image display control unit 261. The internal memory 243 is a storage unit that stores captured still images and moving images, and can also be used as a work area of the system controller 280. The compression / decompression circuit 242 is a circuit that compresses or decompresses image data. The compression / decompression circuit 242 reads an image stored in the internal memory 243, performs compression processing or decompression processing, and writes the processed data to the internal memory 243 again.

  The system controller 280 includes a CPU, an MPU, and the like, and controls the entire imaging apparatus 201. A power button 202, a release button 203, a zoom key 204, and a menu operation key 205 are operation means for inputting various operation instructions of the system controller 280. The operation means is composed of one or a plurality of combinations such as a switch, a dial, and a touch panel. A signal output in response to the operation of the release button 203 is used as a trigger signal for operating a shutter for recording a still image or a trigger signal for starting or stopping moving image recording.

  In the present embodiment, the system controller 280 includes a motion amount detection unit 281 (calculation unit), an exposure control unit 282 (control unit), and a focal length acquisition unit 283 (acquisition unit). The motion amount detection unit 281 detects a motion amount between the frames before and after the captured image (between image frames acquired at different timings). In the present embodiment, the motion amount detection unit 281 calculates a motion vector of a subject included in an image (an image corresponding to image data output from the image sensor 231). The focal length acquisition unit 283 acquires a focal length at the time of shooting. The exposure control unit 282 calculates an appropriate exposure value based on the measured luminance level, and performs exposure control based on the calculated appropriate exposure value. In the present embodiment, the exposure control unit 282 controls the exposure time based on the motion vector of the subject, shake information, and the focal length.

  The system controller 280 controls the focal length by driving the zoom lens 211 in the optical axis direction based on a signal output in response to an operation of the zoom key 204. In the present embodiment, the zoom control unit 221 calculates the zoom drive speed and the drive direction based on the direction and operation amount of the zoom key 204 operated by the photographer in accordance with an instruction from the system controller 280. The zoom lens 211 moves along the optical axis according to the calculation result. The power control unit 271 controls the power source 272 so that power is supplied to each unit of the imaging apparatus 201 using a signal from the power button 202 as a trigger.

  In the present embodiment, for example, the image blur correction apparatus is configured by the camera shake correction control unit 222 (shake detection unit 2221) and the system controller 280 (motion amount detection unit 281, exposure control unit 282, focal length acquisition unit 283). The

  Next, the configuration and operation of the camera shake correction control unit 222 will be described with reference to FIG. FIG. 2 b is a block diagram of the camera shake correction control unit 222. The camera shake correction control unit 222 is a correction unit that performs image blur correction by driving an image blur correction lens 212 included in the optical unit 210 in a direction orthogonal to the optical axis. The shake correction control unit 222 includes a shake detection sensor such as an angular velocity sensor (angular velocity detection unit) that detects an angular velocity (information on angular velocity), and a shake detection unit 2221 (detection unit). Shake information) is detected (acquired). The shake detection unit 2221 a detects vibration in the pitch direction of the imaging device 201. The shake detector 2221b detects vibration in the yaw direction.

  FIG. 3 is an explanatory diagram of each axis and direction of the imaging apparatus 201. In the imaging apparatus 201, the optical axis 302 is parallel to the Z axis, the pitch direction 303p corresponds to the rotation direction around the X axis, and the yaw direction 303y corresponds to the rotation direction around the Y axis. The roll direction corresponds to the rotation direction around the optical axis 302 (Z axis).

  The signals acquired by the shake detection units 2221a and 2221b are converted into digital signals via the A / D converters 2222a and 2222b, respectively. The filters 2223a and 2223b remove and output a low frequency component equal to or lower than a predetermined low frequency cutoff frequency from the angular velocity signals converted by the A / D converters 2222a and 222b, respectively. Further, by integrating the angular velocity signals output from the A / D converters 2222a and 2222b, the shake angle applied to the imaging apparatus 201 is calculated.

  The target position calculation unit 2224 amplifies the shake angle calculated by the filters 2223a and 2223b based on the zoom position, the focus position, and the focal length and photographing magnification obtained from these, and calculates an angle target value. This is because the blur correction sensitivity on the imaging surface with respect to the image blur correction stroke changes due to optical changes such as the focal length and the shooting magnification. The target position calculation unit 2224 calculates the drive amount of the image blur correction lens 212 based on the angle target value. Note that the zoom position, the focus position, and the focal length and photographing magnification obtained from these can be acquired via the system controller 280.

  A signal indicating the difference between the target position calculated by the target position calculation unit 2224 and the current position of the image blur correction lens 212 acquired by the blur correction lens position detection units 2227a and 2227b is input to the position control unit 2225. The The driver 2226 drives the image blur correction lens 212 by supplying a drive current corresponding to the driving amount of the image blur correction lens 212 in accordance with a signal output from the position control unit 2225 to the driver 2226.

  Next, with reference to FIG. 1, processing (imaging device control method) when the imaging device 201 of the present embodiment is set to the panning assist mode will be described. FIG. 1 is a flowchart illustrating a method for controlling the imaging apparatus 201 (image blur correction apparatus). Each step in FIG. 1 is mainly executed based on a command from the system controller 280 of the imaging apparatus 201.

  First, in step S101, the system controller 280 determines whether or not the imaging apparatus 201 is set to the panning assist mode. If the panning assist mode is set, the process proceeds to step S102. On the other hand, if the panning assist mode is not set, the system controller 280 performs normal image stabilization processing and repeats the determination in step S101 until the panning assist mode is set.

  In step S <b> 102, the system controller 280 sets a background sink amount when performing panning shooting. At this time, the photographer sets (selects) an arbitrary amount of background flow via the operation unit of the imaging apparatus 201. The background sink amount can be expressed as, for example, a level such as large, medium, or small. In addition, the background sink level and the image diagram are displayed together so that the background sink amount can be grasped intuitively, and the ratio of each background sink amount to the total angle of view is displayed. May be.

  In step S103, the system controller 280 starts servo AF. By performing servo AF, it is possible to always focus on the subject. In this embodiment, servo AF is performed as the focus control method, but the present invention is not limited to this, and other focus control methods may be used.

  Subsequently, in step S104, the system controller 280 starts detecting a motion vector. Here, the system controller 280 (motion amount detection unit 281) detects (calculates) a motion vector from a live view image acquired at a predetermined frame rate. For example, the motion amount detection unit 281 sets a search block obtained by dividing an image into a plurality of regions, and detects a motion vector between images in units of search blocks.

  When there are two images acquired in time series, the motion amount detection unit 281 selects all regions of the previously acquired image (image data) as a plurality of blocks (for example, in FIG. 4A). Are divided into a plurality of image blocks 401a). Next, the motion amount detection unit 281 performs the same process on images (image data) acquired later in time series. Then, the motion amount detection unit 281 compares the image block acquired earlier in time series with the image block acquired later in time series to calculate the similarity. The motion amount detection unit 281 performs such processing on the entire region while shifting the comparison region in the other image data, and determines the region with the highest similarity as the destination region. The motion amount detection unit 281 performs this process on all the blocks of the image data, and calculates motion vectors for all the blocks. Such a processing method is called a block matching method, but the motion vector may be calculated by another method.

  The motion amount detection unit 281 constantly updates the value calculated in this way until just before the exposure unless the reliability is lower than a predetermined value. Thereby, since the calculation result is reflected until immediately before the exposure, it is possible to perform the panning control with high accuracy during the exposure.

  Subsequently, in step S105, the shake detection unit 2221 of the camera shake correction control unit 222 detects an angular velocity applied to the imaging device 201 with respect to each axis. Subsequently, in step S106, the system controller 280 determines whether or not the release button 203 is half-pressed (hereinafter referred to as “S1_ON”). If S1_ON, the process proceeds to step S107. On the other hand, when it is S1_OFF, the system controller 280 repeats the determination of step S107 until it becomes S1_ON.

  Subsequently, in step S107, the system controller 280 determines whether or not the release button 203 is fully pressed (hereinafter referred to as “S2_ON”). If it is S2_ON, the process proceeds to step S108. On the other hand, when it is S2_OFF, the determination of step S107 is repeated until it becomes S2_ON.

  Subsequently, in step S108, the system controller 280 (focal length acquisition unit 283) acquires a focal length (shooting focal length) at the time of shooting. Subsequently, in step S109, the system controller 280 (motion amount detection unit 281) calculates the drive amount of the image blur correction lens 212. Here, a method of calculating the drive amount of the image blur correction lens 212 will be described with reference to FIG. FIG. 5 is a flowchart showing a method for calculating the drive amount of the image blur correction lens 212. Each step in FIG. 5 is mainly executed by the motion amount detection unit 281 and the camera shake correction control unit 222.

  First, in step S501, the motion amount detection unit 281 performs histogram processing based on the motion vector detected (calculated) in step S104. Here, consider a case where the calculated motion vector is shown in FIG. 4A shows the direction of the motion vector, FIG. 4B shows the numerical value of the motion vector, and FIG. 4C shows the result of histogram processing of the motion vector. As shown in FIGS. 4A and 4B, in the present embodiment, all regions in the image are divided into a plurality of image blocks 401 a by the motion amount detection unit 281. In the present embodiment, for simplicity of explanation, the motion vector is calculated only for the horizontal movement of the image, but the present invention is not limited to this.

  Subsequently, in step S502, the motion amount detection unit 281 estimates the background movement amount based on the angular velocity applied to the imaging device 201. The background movement amount A [pixel] can be obtained by the following equation (1).

A = f · tan (−ω / FR) / PP (1)
In Expression (1), f represents a focal length [mm], FR represents a frame rate [fps], and PP represents a cell pitch [mm]. The angular velocity ω [rad / sec] can be acquired by the shake detection unit 2221 (a shake detection sensor).

  In step S503, the motion amount detection unit 281 performs a process of dividing (separating) the motion vector in the image into a background vector (background motion vector) and a subject vector (subject motion vector). If the background movement amount A is determined to be “5” in step S502, it can be estimated that a numerical value other than the size “5” is the subject vector, as shown in FIG. In this way, the motion amount detection unit 281 extracts the subject vector from the motion vector. In this embodiment, the background vector and the subject vector are separated from the angular velocity applied to the imaging apparatus 201. However, the present invention is not limited to this, and the motion vector in the image is used as the background vector by using another method. It may be separated into subject vectors. In general, a photographer takes a picture while panning in order to keep the subject at one point within the angle of view. Therefore, a larger motion vector is output for the background, and the subject is output as a motion vector for the remaining blur amount. Using this tendency, a motion vector in an image may be separated into a background vector and a subject vector. In this way, it is possible to determine that the region (background region) that can be separated as the background is the shaded portion shown in FIG. 4B and the remaining portion is the subject (subject region).

  In step S504, the system controller 280 calculates the driving amount of the image blur correction lens 212. The driving amount of the image blur correction lens 212 can be calculated from the subject vector. This is because, as described above, the subject vector is a motion vector corresponding to the remaining blur amount, and corresponds to the difference in angular velocity when the photographer performs the panning operation. Based on a command from the system controller 280, the camera shake correction control unit 222 corrects the remaining blur amount with the image blur correction lens 212 and controls to stop the movement of the subject. The remaining blur amount can be corrected using, for example, a dominant vector having the largest numerical value among the subject vectors. Further, the blur remaining amount may be corrected using the average value Va of the subject vector. Thus, the flowchart of FIG. 5 (Step S109) is completed.

  Subsequently, in step S110, the system controller 280 (exposure control unit 282) sets exposure conditions. Here, the exposure control method will be described with reference to FIG. FIG. 6 is a flowchart showing an exposure control method. Each step of FIG. 6 is mainly executed by the exposure control unit 282.

  First, in step S601, the exposure control unit 282 calculates the first exposure time Tv ′ [sec] based on the background flow amount set in step S102 and the output of the shake detection unit 2221. Here, the background flow amount is X [%] with respect to the angle of view (set by the photographer in step S102), the angular velocity applied to the imaging apparatus 201 is ω [deg / sec], and the focal length is f [mm]. . The cell pitch of the image sensor 231 (sensor) is PP [mm / pixel], the pixel size is Gv [pixel] in the vertical direction, and Gh [pixel] in the horizontal direction. Further, it is assumed that the photographer is panning in the horizontal direction.

  When the background flow amount is converted into the number of pixels using these values, the background flow amount B [pixel] can be expressed as the following equation (2).

B = Gh × X × PP (2)
The first exposure time Tv ′ [sec] is expressed by the following equation (3) using the background flow amount B [pixel].

Tv ′ = C · B / (f · ω) (3)
In the formula (3), C is an arbitrary constant.

  In step S602, the exposure control unit 282 sets an upper limit value (maximum exposure time) of the exposure time based on the calculation result of the subject vector (subject motion vector). Here, the upper limit value of the exposure time is defined as a second exposure time Tvm [sec]. The second exposure time Tvm can be obtained, for example, as follows. First, the exposure control unit 282 obtains the average value Va of the subject vector from the result of FIG. Next, the exposure control unit 282 calculates the maximum value Vm of the subject vector. When the subject flow tolerance (predetermined tolerance) is I [pixel], the second exposure time Tvm needs to satisfy the following conditional expression (4).

(Vm−Va) × Tvm <I (4)
Therefore, the second exposure time Tvm is expressed as the following formula (5).

Tvm = I / (Vm−Va) (5)
The subject flow allowable value I is an arbitrary numerical value, and may be determined (changed) according to the subject to be photographed and the photographing scene.

  Subsequently, in step S603, the exposure control unit 282 compares the first exposure time Tv 'calculated in step S601 with the second exposure time Tvm calculated in step S602. When the first exposure time Tv ′ is smaller than the second exposure time Tvm as a result of comparing the first exposure time Tv ′ and the second exposure time Tvm (Tv ′ <Tvm), the process proceeds to step S604. The exposure control unit 282 sets the exposure time used for shooting to the first exposure time Tv ′. On the other hand, when the first exposure time Tv ′ is equal to or longer than the second exposure time Tvm (Tv ′ ≧ Tvm), the process proceeds to step S605, and the exposure control unit 282 sets the exposure time used for photographing to the second exposure time Tvm. Set to.

  Thus, in the present embodiment, preferably, the exposure control unit 282 controls the exposure time so as not to exceed the maximum exposure time (second exposure time Tvm) corresponding to the motion vector of the subject. More preferably, the motion amount detection unit 281 calculates a maximum value Vm and an average value Va of motion vectors at a plurality of positions of the subject as motion vectors of the subject. Then, the exposure control unit 282 determines the maximum exposure time based on the difference (Vm−Va) between the maximum value Vm and the average value Va of the motion vector. More preferably, the exposure control unit 282 is based on the difference (Vm−Va) between the maximum value Vm and the average value Va of the motion vector and the subject flow allowable value I determined according to the subject or the shooting scene ( For example, according to equation (5), the maximum exposure time is determined. Preferably, the exposure control unit 282 calculates a first exposure time Tv ′ based on the shake information and the background flow amount set by the user (S601), and calculates the first exposure time and the maximum exposure time. Compare (S603). When the first exposure time is shorter than the maximum exposure time, the first exposure time is set as the exposure time (S604), and when the first exposure time is longer than the maximum exposure time, the maximum exposure time is set as the exposure time. Setting is made (S605). Thus, by limiting the exposure time in consideration of the speed of the subject, it is possible to prevent the subject from flowing too much and set an appropriate exposure time according to the subject.

  In step S606, the exposure control unit 282 performs an appropriate exposure calculation. The photometric value calculated here is Bv (Bv value). Subsequently, in step S607, based on the Bv value obtained in step S606, the exposure time (Tv value) set in step S604 or step S605, and the diagram for the panning mode, the exposure control unit 282 is provided. Calculates and sets the Av value and ISO sensitivity.

  Here, the following expressions (6) to (9) are used for the exposure calculation.

Bv = Tv + Av−Sv (6)
Tv = −log2 (7)
Av = 2log2 (8)
Sv = log2 (0.3 × ISO sensitivity) (9)
The exposure control unit 282 sets the exposure value obtained from these, and ends the flow of FIG. 6 (step S110).

  In step S111, the system controller 280 starts exposure. In step S112, based on a command from the system controller 280, the camera shake correction control unit 222 drives the image blur correction lens 212 while performing exposure. The image blur correction lens 212 is driven according to the driving amount calculated in step S109. In the present embodiment, the image sensor 231 photoelectrically converts an optical image while driving the image blur correction lens 212 in a direction orthogonal to the optical axis by the camera shake correction control unit 222 with the exposure time set in step S110. Output the image data.

  Subsequently, in step S113, the system controller 280 determines whether or not the set exposure time has ended. If the exposure has not been completed yet, the process returns to step S112. When the exposure is completed, the process proceeds to step S114. In step S114, the system controller 280 (camera shake correction control unit 222) returns the position of the image blur correction lens 212 to the initial position.

  According to the present embodiment, the exposure time is limited by comparing the exposure time obtained from the background flow rate with the exposure time obtained from the maximum value of the subject vector. As a result, it is possible to prevent the subject from flowing and impairing the sense of reality of panning shot shooting. In addition, the calculation method of exposure time is not limited to this. For example, a method for calculating the exposure time from the difference between the background vector and the subject vector, or a method for calculating the exposure time from the difference between the in-focus motion vector and the subject vector may be used.

  Further, the method for limiting the exposure time is not limited to this. For example, an exposure time obtained by multiplying the first exposure time by a constant may be set so that the effect of panning is surely left regardless of the size of the subject vector. Thus, even a photographer who is not accustomed to panning can automatically set an exposure time that can stop the movement of the subject while flowing the background without depending on the subject. Therefore, even an inexperienced photographer can easily obtain a panoramic image with a sense of reality.

  As mentioned above, although this invention was explained in full detail based on the suitable embodiment, this invention is not limited to specific embodiment, Various forms of the range which does not deviate from the summary of this invention are also included in this invention. . A part of the above-described embodiments may be appropriately combined. For example, the motion amount detection unit 281 calculates the minimum value of the motion vector at a plurality of positions of the subject as the motion vector of the subject, and the exposure control unit 282 controls the exposure time based on the minimum value of the motion vector. Good. The motion amount detection unit 281 calculates the subject motion vector and the background motion vector included in the image, and the exposure control unit 282 controls the exposure time based on the subject motion vector and the background motion vector. May be. The camera shake correction control unit 222 can also perform image blur correction by driving the image sensor 231 in a direction orthogonal to the optical axis instead of the image blur correction lens 212. In this case, the image sensor 231 photoelectrically converts the optical image and outputs image data while being driven by the camera shake correction control unit 222 during the set exposure time.

  Also, when a software program that realizes the functions of the above-described embodiments is supplied from a recording medium directly to a system or apparatus having a computer that can execute the program using wired / wireless communication, and the program is executed Are also included in the present invention. Accordingly, the program code itself supplied and installed in the computer in order to implement the functional processing of the present invention by the computer also realizes the present invention. That is, the present invention includes a computer program for realizing the functional processing of the present invention. In this case, the program may be in any form as long as it has a program function, such as an object code, a program executed by an interpreter, or script data supplied to the OS. As a recording medium for supplying the program, for example, a magnetic recording medium such as a hard disk or a magnetic tape, an optical / magneto-optical storage medium, or a nonvolatile semiconductor memory may be used. As a program supply method, a computer program that forms the present invention is stored in a server on a computer network, and a connected client computer downloads and programs the computer program.

  The imaging apparatus of the present embodiment can automatically set an exposure time that can stop the movement of the subject while flowing the background without depending on the subject, even for a photographer unfamiliar with panning. For this reason, according to the present embodiment, an image blur correction device, an imaging device, a lens device, a control method for the image blur correction device, a program, and a storage medium that can easily acquire a realistic shot image are provided. be able to.

281 Motion amount detection unit (calculation means)
282 Exposure control unit (control means)
283 Focal length acquisition unit (acquisition means)

Claims (16)

Calculating means for calculating a motion vector of a subject included in the image;
An acquisition means for acquiring a focal length;
An image blur correction apparatus comprising: a control unit that controls an exposure time based on the motion vector of the subject, shake information detected by a detection unit, and the focal length.   The image blur correction apparatus according to claim 1, wherein the control unit controls the exposure time so as not to exceed a maximum exposure time corresponding to a motion vector of the subject. The calculation means calculates a maximum value and an average value of motion vectors at a plurality of positions of the subject as the motion vector of the subject,
The image blur correction apparatus according to claim 2, wherein the control unit determines the maximum exposure time based on a difference between the maximum value and the average value of the motion vectors.   The control means determines the maximum exposure time based on a difference between the maximum value and the average value of the motion vector, and a subject flow allowable value determined according to the subject or a shooting scene. The image blur correction apparatus according to claim 3, wherein The control means includes
Calculating a first exposure time based on the shake information and a background flow amount set by a user;
Comparing the first exposure time and the maximum exposure time;
If the first exposure time is shorter than the maximum exposure time, the first exposure time is set as the exposure time;
4. The image blur correction device according to claim 2, wherein when the first exposure time is longer than the maximum exposure time, the maximum exposure time is set as the exposure time. 5. The calculation means calculates a minimum value of a motion vector at a plurality of positions of the subject as the motion vector of the subject,
The image blur correction apparatus according to claim 1, wherein the control unit controls the exposure time based on the minimum value of the motion vector. The calculating means calculates a motion vector of the subject and a background motion vector included in the image;
The image blur correction apparatus according to claim 1, wherein the control unit controls the exposure time based on a motion vector of the subject and a motion vector of the background.   8. The image blur correction apparatus according to claim 1, wherein the shake information is information related to an angular velocity detected by an angular velocity detection unit serving as the detection unit.   9. The image blur correction apparatus according to claim 1, wherein the control unit controls the exposure time when the panning assist mode is set. An image sensor that photoelectrically converts an optical image formed via the imaging optical system and outputs image data; and
Calculating means for calculating a motion vector of a subject included in an image corresponding to the image data;
An acquisition means for acquiring a focal length;
An image pickup apparatus comprising: a control unit that controls an exposure time based on the motion vector of the subject, shake information detected by a detection unit, and the focal length. A correction unit that performs image blur correction by driving an image blur correction lens included in the imaging optical system in a direction orthogonal to the optical axis;
The image pickup device according to claim 10, wherein the image pickup device photoelectrically converts the optical image and outputs the image data while driving the image blur correction lens by the correction unit during the exposure time. apparatus. A correction unit that performs image blur correction by driving the image sensor in a direction orthogonal to the optical axis;
The image pickup apparatus according to claim 10, wherein the image pickup device photoelectrically converts the optical image and outputs the image data while being driven by the correction unit during the exposure time. An imaging optical system;
Calculating means for calculating a motion vector of a subject included in an image acquired via the imaging optical system;
Detecting means for detecting shake information;
An acquisition means for acquiring a focal length;
A lens apparatus comprising: control means for controlling an exposure time based on the motion vector of the subject, the shake information, and the focal length. Calculating a motion vector of a subject included in the image;
Detecting shake information;
Obtaining a focal length;
And a step of controlling an exposure time based on the motion vector of the subject, the shake information, and the focal length. Calculating a motion vector of a subject included in the image;
Detecting shake information;
Obtaining a focal length;
A program that causes a computer to execute an exposure time control step based on the motion vector of the subject, the shake information, and the focal length.   A storage medium storing the program according to claim 15.