JP2021043308A - Image shake correction system and method, imaging apparatus, and imaging system - Google Patents

Abstract

To highly accurately correct a shake in an imaging system that consists of an interchangeable lens and a camera main body.SOLUTION: An image shake correction system has: determination means that determines whether an instruction about a predetermined operation involving vibration is given; setting means that sets a correction ratio of shake correction performed by an imaging apparatus and a lens unit based on a result of the determination; first generation means that generates a first shake correction signal based on a shake signal detected in the imaging apparatus and the correction ratio in the imaging apparatus; and first control means that controls the first shake correction means in the imaging apparatus based on the first shake correction signal. When the instruction about the predetermined operation is determined to be given, the setting means switches the correction ratio in the imaging apparatus to a second correction ratio that is lower than a first correction ratio in the imaging apparatus before the instruction about the predetermined operation is determined to be given, for a first period during which vibration continues from when the instruction about the predetermined operation is determined to be given.SELECTED DRAWING: Figure 3

Description

The present invention relates to an image shake correction system and method, an imaging device and an imaging system.

Various methods have been proposed as image blur correction for preventing image deterioration that may occur due to the influence of the photographer's camera shake or the like when shooting with a digital camera. For example, an optical image blur correction method in which the correction lens is shifted in a direction substantially orthogonal to the optical axis and an imaging surface type image blur correction method in which the image sensor is shifted in a direction substantially orthogonal to the optical axis are known. ing. Further, in Patent Document 1, in an imaging system to which an interchangeable lens can be attached and detached, both an optical image blur correction means on the interchangeable lens side and an imaging surface type image blur correction means on the camera side are provided, and the respective blur correction means are provided. Is disclosed as a method of correcting image blurring by driving the lens.

Japanese Unexamined Patent Publication No. 2009-251492

However, Patent Document 1 has the following problems. That is, in Patent Document 1, although blur detection means are provided on both the interchangeable lens side and the camera side, when the focal plane shutter in the camera is driven during shooting, the signal obtained by the blur detection means on the camera side is obtained. It is considered that noise is mixed in with the shutter drive. If noise is mixed in the signal from the blur detection means, the accuracy of blur correction will be reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to correct runout with high accuracy in an imaging system including an interchangeable lens and a camera body.

In order to achieve the above object, the image shake correction system of the present invention captures images based on a determination means for determining whether or not a predetermined operation accompanied by vibration is instructed and a determination result by the determination means. A first shake correction signal is generated based on the setting means for setting the correction ratio of the shake correction performed by the apparatus and the lens unit, the shake signal detected by the image pickup device, and the correction ratio of the image pickup device. The generation means 1 and the first control means for controlling the first runout correction means in the image pickup apparatus based on the first runout correction signal, which are predetermined by the determination means. When it is determined that the operation has been instructed, the setting means determines that the predetermined operation has been instructed, and then the vibration due to the predetermined operation continues for the first period. The correction ratio in the imaging device is switched to a second correction ratio that is lower than the first correction ratio in the imaging device before it is determined that the predetermined operation is instructed.

According to the present invention, in an imaging system including an interchangeable lens and a camera body, vibration can be corrected with high accuracy.

The block diagram which shows the structure of the imaging system in 1st Embodiment of this invention. The schematic diagram which shows an example of the signal output from the camera side runout detection part in 1st Embodiment. The timing chart which shows the control of the correction ratio in 1st Embodiment. The flowchart which shows the image shake correction processing at the time of still image shooting in 1st Embodiment. A timing chart showing switching of the correction ratio in the modified example. The flowchart which shows the image shake correction processing at the time of still image shooting in 2nd Embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiment, not all of the plurality of features are essential to the invention, and the plurality of features may be arbitrarily combined. Further, in the attached drawings, the same or similar configurations are designated by the same reference numbers, and duplicate explanations are omitted.

<First Embodiment>
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

● Configuration of Imaging System FIG. 1 is a block diagram showing a configuration of a digital single-lens reflex camera as an example of an imaging system equipped with an image shake correction system according to the present embodiment. As shown in FIG. 1, the imaging system in the present embodiment mainly includes a camera body 1 and an interchangeable lens 2 (lens unit). The camera body 1 and the interchangeable lens 2 can exchange signals via a communication unit 30 that is electrically connected.

The interchangeable lens 2 includes a photographing optical system 22 for passing light rays, a lens side shake correction mechanism 23, a lens drive unit 24, a lens side shake detection unit 25, and a lens system control unit 20 that controls each configuration of the interchangeable lens 2. Including.

The photographing optical system 22 includes a plurality of lenses such as a shake correction lens, a focus lens, and a zoom lens, and an aperture and the like. The lens system control unit 20 receives a command signal from the camera system control unit 10, which will be described later, and causes the lens drive unit 24 to control a focus lens, a zoom lens, an aperture, and the like included in the photographing optical system 22. To send. The lens driving unit 24 adjusts the optical system by driving a focus lens, a zoom lens, an aperture, and the like based on this control signal.

The lens-side shake detection unit 25 is composed of a gyro sensor, detects an angular shake in the interchangeable lens 2, and sends the detected shake signal to the lens-side shake correction control unit 26 included in the lens system control unit 20. The lens-side runout correction control unit 26 performs filter processing, integration processing, and the like on the runout signal from the lens-side runout detection unit 25 to calculate the runout amount. Then, a shake correction signal, which is a drive signal of the shake correction lens included in the photographing optical system 22, is generated based on the calculated runout amount and the correction ratio from the correction ratio control unit 34 described later. The lens-side shake correction mechanism 23 shifts the shake-correction lens in a direction substantially orthogonal to the optical axis 21 of the photographing optical system 22 in response to the shake correction signal from the lens-side shake correction control unit 26, thereby causing runout. To correct.

In the camera body 1, the focal plane shutter 14 (hereinafter, referred to as “shutter 14”) has a shutter curtain composed of a front curtain and a rear curtain, and each shutter curtain travels in the shutter opening. As a result, the light rays that have passed through the photographing optical system 22 of the interchangeable lens 2 are controlled to block light and pass through to the image sensor 11. The drive of the shutter 14 is controlled by the shutter drive control unit 35 in the camera system control unit 10.

The image sensor 11 is composed of a CMOS sensor, a CCD, or the like, receives light rays that have passed through the apertures of the photographing optical system 22 and the shutter 14 of the interchangeable lens 2, and photoelectrically converts them into analog electrical signals. The converted analog electric signal is quantized by an A / D converter (not shown), converted into a digital signal (image data), and sent to the image processing unit 12. The image processing unit 12 has a white balance circuit, a gamma correction circuit, an interpolation calculation circuit, and the like inside, and generates image data from a signal acquired from the image sensor 11 in response to a command from the camera system control unit 10. .. The image data generated by the image processing unit 12 is stored in the memory 13.

Further, the camera body 1 has an operation unit 15 for receiving an operation by a user and an image display unit 16 for displaying an image or the like.

The camera system control unit 10 includes a CPU (central processing unit) and the like, and controls the control of the camera body 1 including communication with the interchangeable lens 2. When the release button included in the operation unit 15 is pressed and a shooting instruction is received, the camera system control unit 10 generates a timing signal or the like in response to the shooting instruction, controls the image sensor 11 or the like, and controls the lens. A control signal is transmitted to the system control unit 20.

Further, in the camera body 1, the camera side shake detection unit 31 is composed of a gyro sensor, detects an angular shake in the camera body 1, and uses the detected shake signal as a camera side shake correction control unit in the camera system control unit 10. Send to 32. The camera-side shake correction control unit 32 performs filter processing, integration processing, and the like on the signal of the camera-side shake detection unit 31 to calculate the runout amount. Then, a shake correction signal, which is a drive signal of the image sensor 11, is generated based on the calculated runout amount and the correction ratio from the correction ratio control unit 34 in the camera system control unit 10. The camera-side shake correction mechanism 33 shifts the image sensor 11 in a direction substantially orthogonal to the optical axis 21 of the photographing optical system 22 in response to the shake correction signal from the camera-side shake detection unit 31, thereby causing shake. to correct.

The correction ratio control unit 34 determines the correction ratio of the correction drive shared by the camera body 1 side and the interchangeable lens 2 side when the imaging system performs shake correction according to the focal length of the interchangeable lens 2, the shooting sequence, and the like. decide. Then, the correction ratio determined by the correction ratio control unit 34 is sent to the camera side shake correction control unit 32 and the lens side shake correction control unit 26, respectively.

For example, when the correction ratio is 1: 1 on the camera body 1 side and the interchangeable lens 2 side, the camera side shake correction control unit 32 attenuates the shake signal detected by the camera side shake detection unit 31 to 50%. The correction drive amount of the camera side shake correction mechanism 33 is calculated. On the other hand, the lens-side shake correction control unit 26 attenuates the shake signal detected by the lens-side shake detection unit 25 to 50%, and calculates the correction drive amount of the lens-side shake correction mechanism 23.

● Effect of Vibration Noise Next, the effect of vibration noise on the vibration signal of the camera-side vibration detection unit 31 due to the driving of the shutter 14 will be described with reference to FIG.

FIG. 2 shows a runout signal detected by the camera side runout detection unit 31, where the horizontal axis represents time and the vertical axis represents the angular velocity [deg / s] which is the detection level of the runout signal. In FIG. 2, the camera-side shake detection unit 31 detects rotational vibration due to camera shake of the camera body 1 in the entire time region, but vibration noise (shutter), which is an effect of the shutter front curtain running of the shutter 14 at time t11. It indicates that noise) is starting to be mixed. The shutter noise gradually attenuates from time t11 to time t12.

When the camera side shake correction control unit 32 performs processing such as integration on the shake signal mixed with the shutter noise component to calculate the correction drive amount, the shake correction cannot be performed correctly and the shake correction accuracy is lowered. It ends up. Since the exposure of the still image is started by the traveling of the front curtain of the shutter 14, the runout correction accuracy during the still image exposure is particularly lowered. Therefore, in the present embodiment, by controlling the correction ratio, it is possible to suppress a decrease in the shake correction accuracy during still image exposure due to the influence of vibration caused by an operation such as shutter noise. Specifically, by changing the correction ratio depending on whether or not an operation known to cause vibration (a predetermined operation accompanied by vibration) such as driving the shutter 14 is performed. Reduces the effects of vibrations associated with operations such as shutter noise.

Although a shutter noise component is also mixed in the vibration signal detected by the lens-side vibration detection unit 25, the shutter 14 is mounted inside the camera body 1 and is a vibration transmission path rather than the camera-side vibration detection unit 31. Is far away, so the impact is small.

-Correction Ratio and Timing Next, the control of the correction ratio by the correction ratio control unit 34 in the present embodiment and its timing will be described with reference to FIG.

FIG. 3 is a timing chart showing the control of the correction ratio by the correction ratio control unit 34 and the traveling timing of the front curtain of the shutter 14, and the horizontal axis indicates time. The "lens side correction ratio" and the "camera side correction ratio" indicate the correction ratios shared by the interchangeable lens 2 side and the camera body 1 side, respectively, and the "shutter" indicates the traveling timing of the front curtain of the shutter 14. There is.

As shown in FIG. 3, at time t0, which is the start of the runout correction drive, the correction ratio control unit 34 sets the correction ratio to 60% on the camera body 1 side and 40% on the interchangeable lens 2 side.

At time t1, when a still image shooting instruction is given by pressing the release button included in the operation unit 15, the correction ratio control unit 34 changes the correction ratio to 0% on the camera body 1 side and 100% on the interchangeable lens 2 side. Will be done.

Then, at time t2, the shutter drive control unit 35 starts traveling the front curtain of the shutter 14, so that the exposure is started, and at time t3, the traveling of the front curtain ends. Time t2 corresponds to the timing of time t11 in FIG.

Next, at time t4, the correction ratio control unit 34 resets the correction ratio to 60% on the camera body 1 side and 40% on the interchangeable lens 2 side. At time t3, the traveling of the front curtain of the shutter 14 ends, but as shown with reference to FIG. 2, the vibration of the shutter noise continues even after the traveling of the front curtain ends, so that the shutter noise remains at a certain level. Does not change the correction ratio.

After that, the rear curtain of the shutter 14 runs, the exposure ends, and the still image shooting ends. Since still image shooting ends when the rear curtain of the shutter 14 is running, the correction ratio is not changed in this embodiment.

In this way, during the period when shutter noise is mixed in the camera side shake detection unit 31 during shooting, the correction ratio control unit 34 controls the correction ratio to be 0% on the camera body 1 side and 100% on the interchangeable lens 2 side. To do. By performing such control, it is possible to prevent the camera side shake correction mechanism 33 from deteriorating the correction accuracy due to the shutter noise mixed in the shake signal of the camera side shake detection unit 31.

If the magnitude of the shutter noise at time t4 has a small effect on the shake correction operation, the shutter noise may not be completely contained. Therefore, the signal until the shutter noise is settled may be measured in advance to obtain the time until the amplitude of the shutter noise becomes acceptable, and the period from the time t1 to the time t4 may be set.

Alternatively, instead of determining the length of the period from time t1 to t4 in advance, the predetermined period may be determined using the signal of the camera-side shake detection unit 31 as follows. First, a high frequency component such as 100 Hz or higher, which is different from camera shake, is extracted from the shake signal from the camera side shake detection unit 31 by using a BPF (bandpass filter) or the like. Then, when it is determined from the extracted high-frequency component signal that the shutter noise is within a desired amplitude, the correction ratio control unit 34 may be instructed to change the correction ratio. In addition to using the runout signal of the camera side runout detection unit 31, an acceleration sensor or the like is separately attached in the vicinity of the camera side runout detection unit 31, and the timing for switching the correction ratio is determined according to the result of the acceleration sensor signal. Is also good.

The correction ratio between the camera body 1 side and the interchangeable lens 2 side described above is not limited to the above value, and the correction ratio on the camera body 1 side is such that the shutter noise is generated while the shutter noise is generated. It suffices to control it so that it is smaller than when it is not occurring. At that time, it may be determined by the amount that can be corrected by the camera-side shake correction mechanism 33 and the lens-side shake correction mechanism 23, and the focal length of the interchangeable lens 2.

● Image runout correction processing Next, the flow of the image shake correction processing in the first embodiment will be described with reference to FIG. FIG. 4 is a flowchart of image shake correction processing during still image shooting, which is controlled by the camera system control unit 10.

When the processing is started, in S101, the shake correction drive is started on the camera body 1 side and the interchangeable lens 2 side based on the correction ratio predetermined by the correction ratio control unit 34. The correction ratio in S101 corresponds to the time before the time t1 in FIG. 3, and is set to, for example, 60% on the camera body 1 side and 40% on the interchangeable lens 2 side.

In S102, it is determined whether the release button included in the operation unit 15 is pressed and a still image shooting instruction is given. S102 is repeated and waits until it is determined that the shooting instruction has been given. If it is determined that the shooting instruction has been given, the process proceeds to S103.

In S103, the correction ratio control unit 34 changes the correction ratio set in S101 to 0% on the camera body 1 side and 100% on the interchangeable lens 2 side. S103 corresponds to the time t1 in FIG.

In S104, the shutter drive control unit 35 starts the traveling of the front curtain of the shutter 14, which starts the shooting exposure of the still image. S104 corresponds to the time t2 in FIG.

In S105, after changing the correction ratio in S103, it is determined whether or not a predetermined change condition such as the elapse of a predetermined period is satisfied, and the process waits until the change condition is satisfied, and the change condition is satisfied. If it is determined, the process proceeds to S106.

In S106, the correction ratio control unit 34 changes the correction ratio to the original ratio. S106 corresponds to the time t4 in FIG.

In S107, the shutter drive control unit 35 drives the shutter 14, and the rear curtain starts running. As a result, the shooting exposure of the still image is completed.

In S108, the process returns to S102 until the power of the camera body 1 is turned off, and the process is repeated. When it is determined that the power of the camera body 1 has been turned off, the process ends.

As described above, according to the first embodiment, based on the correction ratio determined by the correction ratio control unit 34, the camera body 1 side and the interchangeable lens 2 side share the shake correction to perform the shake correction, thereby performing the entire imaging system. The amount of runout correction can be increased. Further, while the shutter noise is generated, the shake can be corrected with high accuracy by lowering the correction ratio of the shake correction amount on the camera body 1 side, which is more affected by the shutter noise.

Further, since the correction ratio control unit 34 transmits only the correction ratio information to the camera side shake correction control unit 32 and the lens side shake correction control unit 26, it is compared with sending a shake signal, a shake correction signal, and the like. , The communication load can be reduced.

For example, when the signal of the camera side shake detection unit 31 is transmitted to the lens side shake correction control unit 26 via the communication unit 30 and the correction drive amount of the lens side shake correction mechanism 23 is calculated using the result, the shake correction is performed. Since the sampling rate of the runout signal required for control is high, high-speed communication is required via the communication unit 30. Further, it is considered that the calculation processing load increases due to the influence of the communication delay and the communication processing of the camera system control unit 10 and the lens system control unit 20.

On the other hand, in the present embodiment, since only the correction ratio information needs to be communicated only at the timing of changing the correction ratio, high-speed communication is not required and the arithmetic processing load associated with the communication can be suppressed to a low level.

<Modification example>
In the first embodiment described above, the correction ratio is discontinuously changed by the correction ratio control unit 34, but the correction ratio may be controlled as follows. FIG. 5 is a timing chart showing the correction ratio by the correction ratio control unit 34 and the traveling timing of the shutter in the modified example. Similar to FIG. 3, the horizontal axis represents time, the vertical axis represents the shared correction ratio, and the drive timing of the front curtain of the shutter 14.

Since the operation from time t20 to time t23 is the same as the operation from time t0 to time t3 in FIG. 3, the description is omitted.

At time t24, the correction ratio control unit 34 changes the correction ratio, but gradually changes the correction ratio on the interchangeable lens 2 side from 100% to 40% from time t24 to time t25. Then, the correction ratio on the camera body 1 side is also gradually changed from time t24 to time t25 so that the correction ratio gradually approaches from 0% to 60%. The total of the correction ratios of the interchangeable lens 2 side and the camera body 1 side at each time is controlled to be 100%.

After returning to the correction ratio before the change at time t25, the shake correction is performed at a fixed correction ratio until the shooting is completed.

By controlling the correction ratio in this way, the change of the correction ratio of the runout correction becomes smooth, so the drive starts compared to when the correction ratio on the camera body 1 side is changed from 0% to 60% at once. The operation becomes smooth. Similarly, when the correction ratio is changed at time t21, the correction ratio may be changed so as to be asymptotic to the corrected correction ratio, but if the period from time t21 to time t22 is set appropriately, Since the unstable operation of the runout correction operation due to the discontinuous change in the shake correction ratio is stabilized, the influence on the runout correction accuracy is small. Specifically, when the correction ratio on the camera body 1 side is changed from 60% to 0% at time t21, the blur correction amount drive amount becomes discontinuous and the operating wave of the camera side shake correction mechanism 33 looks like a step response. It is conceivable that the operation becomes unstable due to so-called overshoot. In that case, it takes a certain amount of time for the so-called overshoot to settle and the blur correction operation to stabilize.

On the other hand, when the overshoot is reduced by PID control, it takes a certain amount of time for the operation of the camera-side shake correction mechanism 33 to eliminate the delay with respect to the blur correction drive amount and follow as desired. However, if the period from the time t21 to the time t22 is properly set, the runout correction operation is stable by the time t22, so that the influence on the runout correction accuracy is small. Therefore, when changing the correction ratio at least after the period related to the driving of the shutter 14 is completed, it is desirable that the correction ratio is asymptotic to the value of the period other than the period related to the driving of the shutter 14 as described above.

Further, as described above, the correction ratio control unit 34 determines the correction ratio other than the period in which the shutter noise is mixed, depending on the focal length of the interchangeable lens 2 and the like. For example, when the same amount of shake occurs and the focal length is short, the amount of shake on the image plane of the image sensor 11 becomes small, so that the image pickup required for the camera side shake correction mechanism 33 to perform shake correction. The amount of movement of the element 11 is smaller than that when the focal length is long. Therefore, it is set to increase the correction ratio on the camera body 1 side as the focal length becomes shorter.

On the other hand, as the focal length becomes longer, the amount of runout on the image plane of the image sensor 11 increases, and the driveable amount of the camera side shake correction mechanism 33 becomes insufficient. Therefore, the correction ratio on the interchangeable lens 2 side is set to increase. To. For example, assume that an interchangeable lens 2 having a long focal length is attached and the correction ratio is set to 10% on the camera body 1 side and 90% on the interchangeable lens 2 side. In this case, even if a signal mixed with shutter noise from the camera-side shake detection unit 31 is used, the correction ratio on the camera body 1 side is small, so that the influence on the shake correction accuracy is small. Therefore, when the focal length is longer than the predetermined distance, the correction ratio may not be switched by the correction ratio control unit 34 even during the predetermined period required for the shutter 14 to travel to the front curtain.

Further, if the still image exposure time is very short, the still image exposure may end before the shutter noise is settled to a desired level. Further, if the still image exposure time is short, the amount of runout during the exposure period becomes small, so it is conceivable that the amount of runout during the exposure period can be compensated only by the correction drive amount of the lens side shake correction mechanism 23. Therefore, if the shooting exposure time predetermined before shooting is shorter than the predetermined time, the correction ratio may not be switched by the correction ratio control unit 34 even during the predetermined period related to the operation of the shutter 14. For example, when the still image exposure time is 1/100 second, the correction ratio on the interchangeable lens 2 side before the start of still image exposure is set to 100%, and the correction ratio control unit also determines the predetermined period required for the shutter 14 to travel to the front curtain. It is also possible not to switch the correction ratio by 34.

Further, in the above embodiment, the camera side shake correction mechanism 33 is changed to 0% for a predetermined period related to the traveling of the front curtain of the shutter 14, but the ratio is limited to 0% as long as the influence of the shutter noise is small. is not it. At least, it is desirable that the correction ratio on the interchangeable lens 2 side is larger in the correction ratio in other periods than in the predetermined period related to the front curtain running of the shutter 14.

The correction ratio is before the still image exposure (time t0 to t1 in FIG. 3, time t20 to t21 in FIG. 5) and after the end of the predetermined period (time t4 in FIG. 3 and after time t25 in FIG. 5). Do not have to be the same. For example, the correction ratio on the camera body 1 side may be set to 100% before the still image exposure, and the correction ratio on the camera body 1 side may be set to 60% after the end of the predetermined period.

Further, the correction amount may be limited before the still image exposure. For example, before the still image exposure, it is conceivable to limit the correction amount to less than 100% (for example, 1/2) with respect to the shake amount obtained from the signal of the shake detection unit. This is because the shake correction is performed before the still image exposure, so if the still image exposure is started while the shake correction mechanism is at the end of the movable range, the shake correction of the shake correction mechanism during the still image exposure is possible. This is because the amount of correction may be small. Therefore, before the still image exposure, the original correction ratios are halved, and the correction ratios are transmitted to the camera side shake correction control unit 32 and the lens side shake correction control unit 26. For example, when the original correction ratio is 60% on the camera body 1 side and 40% on the interchangeable lens 2 side, the correction ratio may be controlled as 30% on the camera body 1 side and 20% on the interchangeable lens 2 side.

Further, in the above embodiment, the period for lowering the correction ratio on the camera body 1 side is set as the period related to the front curtain running of the shutter 14, but the period related to the rear curtain running of the shutter 14 and the shutter charging operation of the shutter 14 is also photographed. This is the period during which the shutter, which is the drive mechanism, is operating. Therefore, the period related to the rear curtain running of the shutter 14 and the shutter charging operation of the shutter 14 may be controlled by switching the correction ratio in the same manner. For example, noise is mixed in the camera-side shake detection unit 31 even when the shutter 14 is running behind the curtain and the shutter charge operation is performed. As a result, a low-quality runout correction image affected by noise is displayed on the image (so-called live view image) displayed on the image display unit 16 immediately after the still image shooting is completed. When the imaging system is a single-lens reflex camera having a mirror, the mirror drive mechanism is also a shooting drive mechanism. Therefore, as the operation of the photographing drive mechanism, the mirror lockup operation of the mirror drive mechanism (evacuation of the mirror from the optical path) may be targeted. In this way, the correction ratio on the camera body 1 side may be lowered when a predetermined operation accompanied by vibration as described above is instructed other than the traveling of the front curtain shutter.

It is also conceivable that an interchangeable lens not equipped with a shake correction mechanism may be attached to the camera body 1. In that case, the communication unit 30 determines whether or not the camera system control unit 10 is equipped with the shake correction mechanism of the interchangeable lens 2. When the shake correction mechanism is not installed, the correction ratio control unit 34 may control the correction ratio on the camera side so that the correction ratio is always 100% even during the period related to the operation of the shutter 14 and other periods.

<Second embodiment>
Next, a second embodiment of the present invention will be described. Since the configuration of the imaging system in the second embodiment is the same as that described in the first embodiment with reference to FIG. 1, the description thereof will be omitted. However, the imaging system of the second embodiment is capable of high-speed communication via the communication unit 30.

● Image runout correction processing Next, the processing in the second embodiment will be described with reference to FIG. FIG. 6 is a flowchart of image shake correction processing during still image shooting. In the second embodiment, the runout correction drive of the lens side shake correction mechanism 23 and the camera side shake correction mechanism 33 is used by using the shake signal detected by the camera side shake detection unit 31 except for a predetermined period related to the operation of the shutter 14. Calculate the amount.

When the process is started, in S201, the runout signal detected by the camera side runout detection unit 31 is sent to the camera system control unit 10. Then, the transmitted shake signal is divided by the correction ratio control unit 34 based on a predetermined ratio, and the lens side shake correction control unit 26 via the camera side shake correction control unit 32 and the communication unit 30, respectively. Will be sent to. For example, the shake signal detected by the camera-side shake detection unit 31 is transmitted to the camera-side shake correction mechanism 33 at a rate of 60%, to the lens-side shake correction mechanism 23 at a rate of 40%, and the like. Then, the camera-side shake correction control unit 32 and the lens-side shake correction control unit 26 perform filter processing, integration processing, and the like on the shake signal sent at a predetermined ratio to calculate the shake amount. Then, from the calculated amount of runout, each runout correction signal of the camera side shake correction mechanism 33 and the lens side shake correction mechanism 23 is generated, and runout correction is performed. At this time, the lens-side runout detection unit 25 is controlled so as not to operate, or is controlled not to use the runout signal detected by the lens-side runout detection unit 25.

In S202, it is determined whether the release button included in the operation unit 15 is pressed and a still image shooting instruction is given. S202 is repeated and waits until it is determined that the shooting instruction has been given. If it is determined that the shooting instruction has been given, the process proceeds to S203.

In S203, the correction ratio control unit 34 changes the correction ratio set in S201 to 0% on the camera body 1 side and 100% on the interchangeable lens 2 side. At the same time, the camera system control unit 10 instructs the lens side shake correction control unit 26 to generate a shake correction signal of the lens side shake correction mechanism 23 using the shake signal detected by the lens side shake detection unit 25. send.

In S204, the camera-side shake correction control unit 32 stops driving the camera-side shake correction mechanism 33 according to the correction ratio changed in S203. Stopping the drive of the camera-side shake correction mechanism 33 means stopping and holding the movement of the image sensor 11 at that position. On the other hand, the lens-side runout correction control unit 26 performs filter processing, integration processing, and the like on the runout signal detected by the lens-side runout detection unit 25 to generate a runout correction signal. As a result, the shake correction is performed only by driving the lens side shake correction mechanism 23.

In S205, the shutter drive control unit 35 starts the traveling of the front curtain of the shutter 14, which starts the shooting exposure of the still image.

In S206, after changing the correction ratio in S204, it is determined whether or not a predetermined change condition such as the elapse of a predetermined period is satisfied, and the process waits until the change condition is satisfied, and the change condition is satisfied. If it is determined, the process proceeds to S207.

In S207, the correction ratio control unit 34 changes the correction ratio to the original ratio. Then, the camera system control unit 10 sends a command to the lens side shake correction control unit 26 to generate a shake correction signal of the lens side shake correction mechanism 23 using the shake signal detected by the camera side shake detection unit 31. ..

In S208, a signal indicating the detection result of the camera-side runout detection unit 31 is sent to the camera system control unit 10. Then, the transmitted signal is transmitted to the lens side shake correction control unit 26 via the camera side shake correction control unit 32 and the communication unit 30, respectively, based on the ratio determined in S207. Then, the camera-side shake correction control unit 32 and the lens-side shake correction control unit 26 perform filter processing, integration processing, and the like on the signals sent at predetermined ratios, respectively, and perform filter processing, integration processing, and the like, and the camera-side shake correction mechanism 33 and the lens. A runout correction signal of the side runout correction mechanism 23 is generated to perform runout correction.

In S209, the shutter 14 is driven by the shutter drive control unit 35, and the rear curtain starts running. As a result, the shooting exposure of the still image is completed.

In S210, the process returns to S201 until the power of the camera body 1 is turned off, and the process is repeated. When it is determined that the power of the camera body 1 has been turned off, the process ends.

As described above, according to the second embodiment, the runout correction is performed based on the runout signal detected by the lens side runout detection unit 25 during the predetermined period from immediately before the front curtain running, which is the period related to the driving of the shutter 14. .. As a result, it is possible to prevent the shake correction accuracy from being lowered due to the shutter noise mixed in the camera side shake detection unit 31, so that the shake can be corrected with high accuracy.

Further, in the second embodiment, since high-speed communication is possible via the communication unit 30, it is possible to transmit a runout signal having a high sampling rate. If such high-speed communication is possible, if the performance of the lens-side shake detection unit 25 of the attached interchangeable lens 2 is lower than the performance of the camera-side shake detection unit 31, it is detected by the camera-side shake detection unit 31. It is possible to perform shake correction using the shake correction mechanism on both the camera side and the lens side by using the shake signal. On the other hand, by using the signal of the lens side shake detection unit 25 only for a predetermined period related to the operation of the shutter 14, the influence of shutter noise can be reduced and highly accurate shake correction can be performed.

Before the signal of the camera-side shake detection unit 31 is transmitted to the lens-side shake correction control unit 26 via the communication unit 30, the signal may be downsampled according to the communication rate of the communication unit 30. For example, if the signal of the camera side shake detection unit 31 before downsampling is 20 kHz, the communication rate is changed to 500 Hz by downsampling.

Further, in the second embodiment, the result obtained by multiplying the runout signal detected by the camera-side shake detection unit 31 by the correction ratio determined by the correction ratio control unit 34 is obtained by multiplying the shake signal detected by the camera side shake detection unit 31 except for a predetermined period related to the operation of the shutter 14. It was transmitted to the lens side shake correction control unit 26 via 30. However, the present invention is not limited to this, and may be controlled as follows. For example, based on the result of the camera-side shake detection unit 31 and the correction ratio set by the correction ratio control unit 34, the camera-side shake correction control unit 32 generates a shake correction signal of the camera-side shake correction mechanism 33, and at the same time, the lens side. The runout correction signal of the runout correction mechanism 23 is also generated. Then, the shake correction signal of the lens side shake correction mechanism 23 generated by the camera side shake correction control unit 32 is transmitted to the lens side shake correction control unit 26 via the communication unit 30.

<Other Embodiments>
Even if the present invention is applied to a system composed of a plurality of devices (for example, a host computer, an interface device, a scanner, a video camera, etc.), the device including one device (for example, a copier, a facsimile machine, etc.) May be applied to.

The present invention also supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device implement the program. It can also be realized by the process of reading and executing. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

The invention is not limited to the above embodiments, and various modifications and modifications can be made without departing from the spirit and scope of the invention. Therefore, a claim is attached to make the scope of the invention public.

1: Camera body 2: Interchangeable lens, 10: Camera system control unit, 11: Image pickup element, 12: Image processing unit, 14: Focal plane shutter, 15: Operation unit, 20: Lens system control unit, 22: Imaging optics System, 23: Lens side shake correction mechanism, 24: Lens drive unit, 25: Lens side shake detection unit, 30: Communication unit, 31: Camera side shake detection unit, 32: Camera side shake correction control unit, 33: Camera side Runout correction mechanism, 34: correction ratio control unit, 35: shutter drive control unit

Claims (22)

Judgment means for determining whether or not a predetermined operation accompanied by vibration is instructed,
Based on the result of the judgment by the judgment means, the setting means for setting the correction ratio of the shake correction performed by the image pickup apparatus and the lens unit, and the setting means.
A first generation means for generating a first runout correction signal based on a runout signal detected by the image pickup device and a correction ratio in the image pickup device.
It has a first control means for controlling the first runout correction means in the image pickup apparatus based on the first runout correction signal.
When it is determined by the determination means that the predetermined operation has been instructed, the setting means determines that the predetermined operation has been instructed, and then the vibration due to the predetermined operation continues. During the first period of time, the correction ratio of the image pickup device is lower than the first correction rate of the image pickup device before it is determined that the predetermined operation is instructed. Image shake correction system characterized by switching between. A second generation means for generating a second shake correction signal based on the runout signal detected in the lens unit and the correction ratio in the lens unit.
A second control means for controlling the second runout correction means in the lens unit based on the second runout correction signal, and a second control means.
The image shake correction system according to claim 1, further comprising. The setting means is characterized in that after the first period has elapsed, the second correction ratio in the image pickup apparatus is gradually changed to a third correction ratio larger than the second correction ratio. The image shake correction system according to claim 1 or 2. When it is not determined by the determination means that the predetermined operation has been instructed,
The first generation means further generates a runout signal to be transmitted to the lens unit based on the runout signal detected by the image pickup apparatus and the correction ratio in the lens unit.
The second generation means generates a second runout correction signal based on the transmitted runout signal.
When it is determined by the determination means that the predetermined operation is instructed, the first period,
The setting means sets the correction ratio of the image pickup apparatus to 0% and the correction ratio of the lens unit to 100%.
The second generation means according to claim 2, wherein the second generation means generates a second shake correction signal based on the runout signal detected in the lens unit and the correction ratio in the lens unit. Image shake correction system. The image shake correction system according to any one of claims 1 to 4, wherein the total of the correction ratio in the image pickup apparatus and the correction ratio in the lens unit is 100%. The predetermined operation is still image shooting, and before the still image shooting is instructed, the setting means makes the total of the correction ratio in the imaging device and the correction ratio in the lens unit less than 100%. The image shake correction system according to any one of claims 1 to 4, wherein the image shake correction system is limited to. The image shake according to any one of claims 1 to 6, wherein the predetermined operation includes at least one of shutter driving, shutter charging, and retracting the mirror from the optical path. Correction system. The image according to claim 2, wherein the setting means sets the first correction ratio based on a correction amount that can be corrected by the first runout correction means and the second runout correction means. Runout correction system. The image shake correction according to any one of claims 1 to 8, wherein the setting means is set so that the first correction ratio increases as the focal length of the lens unit becomes shorter. system. The image shake according to any one of claims 1 to 9, wherein the setting means is set so that the correction ratio in the lens unit increases as the focal length of the lens unit increases. Correction system. The claim is characterized in that when the focal length of the lens unit is longer than a predetermined focal length, the setting means does not switch from the first correction ratio to the second correction ratio. 10. The image shake correction system according to 10. When a still image shooting with an exposure time shorter than a predetermined exposure time is instructed, the setting means does not switch from the first correction ratio to the second correction ratio. The image shake correction system according to any one of claims 1 to 11. The image shake correction system according to any one of claims 1 to 12, wherein the first period is a time until the vibration accompanying the predetermined operation is settled. Further having an extraction means for extracting a high frequency component of the runout signal,
The first period is a time from when it is determined that the predetermined operation is instructed until the amplitude of the signal of the high frequency component falls within the predetermined amplitude. The image shake correction system according to any one of 1 to 12. The first period of claims 1 to 12 is characterized in that the first period is set based on a signal from an acceleration sensor provided in the imaging device after it is determined that the predetermined operation has been instructed. The image shake correction system according to any one of the items. When the lens unit is not equipped with the shake correction means, the setting means sets the correction ratio in the image pickup apparatus to 100% regardless of the result of the determination by the determination means. Item 1. The image shake correction system according to item 1. An imaging device including the image shake correction system according to claim 1 or 16. An image pickup system comprising the image pickup device and the lens unit, which comprises the image shake correction system according to any one of claims 1 to 16. The judgment means is a judgment process for judging whether or not a predetermined operation accompanied by vibration is instructed.
A setting step in which the setting means sets the correction ratio of the shake correction performed by the image pickup apparatus and the lens unit based on the result of the judgment by the judgment means.
The first generation means is a first generation step of generating a first runout correction signal based on the runout signal detected by the image pickup apparatus and the correction ratio in the image pickup apparatus.
The first control means includes a first control step of controlling the first runout correction means in the image pickup apparatus based on the first runout correction signal.
When it is determined in the determination step that the predetermined operation is instructed, in the setting step, after it is determined that the predetermined operation is instructed, the vibration due to the predetermined operation continues. During the first period of time, the correction ratio of the image pickup device is lower than the first correction rate of the image pickup device before it is determined that the predetermined operation is instructed. An image shake correction method characterized by switching between. The second generation means includes a second generation step of generating a second shake correction signal based on the runout signal detected in the lens unit and the correction ratio in the lens unit.
A second control step in which the second control means controls the second runout correction means in the lens unit based on the second runout correction signal.
The image shake correction method according to claim 19, further comprising. A program for causing a computer to function as each means of the image shake correction system according to any one of claims 1 to 16. A computer-readable storage medium that stores the program according to claim 21.

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