JP2018194770A - Camera system, interchangeable and camera - Google Patents

Abstract

To enable effective panning pictures to be easily taken, and to cause panning picture-taking to be successful even in a scene where various factors make a panning auxiliary function hard to exhibit an effect.SOLUTION: A camera, lens and camera system are configured to: detect a movement velocity on an imaging plane of a main subject; calculate a main subject movement velocity from a difference between a panning velocity conducted by a photographer and the movement velocity thereof; during exposure, detect a difference between the calculated main subject movement velocity and the panning velocity conducted by the photographer, that is, a panning velocity error; undergo optical eccentricity so as to correct the error, and thereby enable the photographer to take fantastic panning pictures; and make a plurality of exposures as changing an amount of optical eccentricity by a panning correction gain. Accordingly, even when an amount to be eccentric due to a factor such as a subject distance, a revolution center, a sensor detection error or the like deviates from the best amount, as to at least one exposure of the plurality of exposures, a panning auxiliary can be conducted at an amount of optical eccentricity closest to the best amount as much as possible, improving a success rate of the panning picture-taken.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an imaging apparatus that can easily realize a panning technique that requires skill in an imaging apparatus that improves the accuracy of a captured image by detecting and correcting camera shake.

  Correction of image blur caused by camera shake or the like occurring in the camera is performed by detecting camera vibration and moving the correction lens or the image sensor in accordance with the detection result to change the optical axis. In principle, camera vibration is detected by a camera equipped with a shake sensor that detects angular acceleration, angular velocity, and the like, and a means for outputting an angular displacement by electrically or mechanically integrating the output signal of the shake sensor. Can be done. Based on this detection information, a correction optical system that decenters the photographing optical axis is driven, and the position of the correction optical system is detected and feedback control is performed so that accurate image blur suppression can be performed. (Patent Document 1).

  There is also panning as one of the methods of shooting with a camera. This is, for example, a technique in which the camera follows the movement of the main subject moving in the horizontal direction.A good panning shot is a photo in which the main subject is stationary and the background is the main subject. It is a photograph flowing in the moving direction. At this time, it is common to shoot with a slow shutter speed in order to make the subject feel lively. Experience is required to make the camera follow the movement of the subject accurately, and since the shutter speed is slow, blurring tends to occur, which is a relatively difficult shooting technique for beginners.

  Therefore, Patent Document 2 proposes a technique for assisting panning by using a correction optical system. As a specific method, the moving speed of the main subject on the imaging surface is detected, and the main subject moving speed is calculated from the difference from the panning speed performed by the photographer. During exposure, a difference between the calculated main subject moving speed and the panning speed performed by the photographer, that is, a panning speed error is detected. By decentering the optical system so as to correct the error, the photographer can take a beautiful panning shot.

JP-A-7-218967 JP 2007-139552 A

  However, when performing panning assistance as in Patent Document 2, the amount to be decentered may slightly deviate from the best due to factors such as subject distance, rotation center, and sensor detection error. If this slight shift occurs, the integral calculation will continue to add the shift for a long time, and there is a high possibility that a photograph that always flows a little will be taken.

  In order to solve the above-described problems, the present invention provides a blur detection unit for detecting a blur of a camera or a photographing lens, a panning speed calculation unit that calculates a panning speed from an output of the blur detection unit, and an imaging screen. Subject moving speed detecting means for detecting the moving speed of the subject from the vector information of the subject image, optical axis decentering means capable of decentering the optical axis of the photographing lens, and correcting the decentering amount of the optical axis decentering means Having a decentering amount correcting means capable of performing a plurality of exposures in a configuration in which the blur correcting means is driven during exposure based on a difference between the panning speed and the subject moving speed, and at least one of the exposures is performed. The eccentric amount of the optical axis eccentric means is changed by the eccentric amount correction means.

  According to the present invention, exposure is performed a plurality of times at the time of panning assist, and the correction value applied to the eccentric amount is changed for each exposure. Therefore, even if the amount of eccentricity slightly deviates from the amount that should actually be eccentric due to various factors, the amount of eccentricity can be made as close as possible to the amount that should be eccentric by the correction value. Thereby, for at least one of the exposures performed a plurality of times, the panning assist can be performed with an eccentricity that is as close as possible to the best.

It is a block diagram showing the camera system of this invention. It is a figure showing the imaging | photography method at the time of panning photography of this invention It is a figure showing each signal waveform at the time of panning photographing of the present invention. It is a figure showing each signal waveform when a panning is performed by 5 times continuous shooting in one form of the present invention. It is a flowchart which shows operation | movement of the camera of this invention. It is a flowchart which shows operation | movement of the interchangeable lens of this invention. It is a flowchart which shows the communication interruption operation | movement of the interchangeable lens of this invention. 3 is a flowchart illustrating an image blur correction operation according to the present invention. It is a flowchart which shows the panning correction gain setting method of this invention.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments.

  The configuration of the camera system according to the embodiment of the present invention will be described below with reference to FIG.

  The camera system includes a camera body 101 and an interchangeable lens 102. The photographing light flux from the subject passes through the photographing optical system of the interchangeable lens 102 and is partially reflected by the quick return main mirror 103 whose central portion is a half mirror during preparation for photographing, and becomes an erect image at the pentaprism 104. The photographer can confirm the erect image as a subject image in the optical viewfinder 105. Reference numeral 106 denotes a photometric circuit, and a sensor in the photometric circuit is a sensor composed of multi-pixel elements divided into a plurality of areas, and measures the illuminance of the subject and vector information indicating the moving direction and moving speed of the subject over time. Can be calculated. The photometry circuit 106 inputs the photometry result of the sensor and vector information to the camera MPU 107, and the camera MPU 107 determines photographing conditions such as exposure time and aperture.

  Reference numeral 108 denotes a sub mirror, which is disposed on the back surface of the quick return main mirror 103, and causes the light beam that has passed through the half mirror surface of the quick return main mirror 103 to enter the distance measuring means 109. The distance measuring means 109 photoelectrically converts the incident light beam and performs signal processing to create distance measurement data, and inputs it to the camera MPU 107.

  When the photographing operation is started, the quick return main mirror 103 and the sub mirror 108 are retracted to the pentaprism 104 side, and the focal plane shutter 110 is driven by the shutter drive circuit 111. Then, the photographing light beam forms an image on the surface of the imaging unit (CCD or CMOS) 112 as a photographing optical image. The captured optical image is photoelectrically converted by the imaging unit 112 into an imaging signal.

  A timing generator 113 controls an accumulation operation, a read operation, a reset operation, and the like of the imaging unit 112. Reference numeral 114 denotes a CDS circuit (double correlation sampling circuit) that reduces accumulated charge noise of the imaging unit 112, and reference numeral 115 denotes a gain control circuit that amplifies the imaging signal. Reference numeral 116 denotes an A / D converter that converts the amplified imaging signal from analog to digital image data. Reference numeral 117 denotes a video signal processing circuit that performs filter processing, color conversion processing, gamma processing, and the like on the image data digitized by the A / D converter 116. The image signal processed by the video signal processing circuit 117 is stored in the buffer memory 118 and displayed on the LCD 119 or recorded on the removable memory card 120.

  The operation unit 121 is a switch for setting the shooting mode of the camera, setting the recording image file size, and releasing at the time of shooting. The camera MPU 107 controls the above operation of the camera body 101 and communicates with the lens MPU 124 via the interface circuit 122 on the camera body 101 side and the interface circuit 123 on the interchangeable lens 102 side. In this communication, various data are exchanged between the digital camera body 101 and the interchangeable lens 102.

  In the interchangeable lens 102, a focus lens 125, a zoom lens 126, an image blur correction lens 127, and a diaphragm 128 are disposed as a part of the photographing optical system.

  The focus lens 125 is driven by a control signal from the lens MPU 124 via the focus control circuit 129 and the focus lens driving motor 130. In addition to the focus lens driving circuit, the focus control circuit 129 includes a focus encoder that outputs a zone pattern signal and a pulse signal according to the movement of the focus lens. The subject distance can be detected by this focus encoder.

  The zoom lens 126 moves when the photographer operates a zoom operation ring (not shown). The zoom encoder 131 outputs a zone pattern signal corresponding to the movement of the zoom lens. The photographic image magnification is obtained by the lens MPU 124 reading signals from the focus encoder and zoom encoder 131 and reading out pre-stored photographic image magnification data based on a combination of subject distance and focal length.

  The image blur correction lens 127 is driven via an image blur correction control circuit 132 and a linear motor 133. Image blur correction is performed as follows. That is, the shake signal of the angular velocity sensor 135 that detects rotational shake is converted into a digital signal by the ADC 136 and input to the lens MPU 124. The lens MPU 124 performs various types of signal processing, calculates a correction lens drive target signal, and performs image blur correction control on a drive signal corresponding to the difference between the correction lens drive target signal and the correction lens position signal output from the correction lens encoder 134. Output to the circuit 132. Image blur correction is performed by feeding back the correction lens position signal output from the correction lens encoder 134 to the image blur correction control circuit 132 in this way. Note that the above-described image blur correction control is performed on each of the two axes of the pitch axis for detecting the vertical tilt and the yaw axis for detecting the horizontal tilt with the camera body 101 as the center.

  The diaphragm 128 is driven via a diaphragm control circuit 137 and a stepping motor 138 by a control signal from the lens MPU 124. The switch 139 is a switch for selecting image blur correction ON / OFF and image blur correction operation mode. As the image blur correction mode, a normal image blur correction operation and a panning operation mode can be selected.

  Next, the panning method of the present invention will be described with reference to FIGS.

  FIG. 2 shows the movements of the subject and the camera in time series (a), (b), and (c) when the subject passing in front of the subject is shot by the panning method. During panning, the camera is shaken so as to match the moving speed of the subject even during the exposure period, so that the movement of the subject is stopped and a photograph with the background flowing can be taken. However, when the photographer is unfamiliar with the camera, even if he intends to shake the camera according to the movement of the subject as shown in Fig. 2, the panning speed at which the camera is shaken and the moving speed of the subject are in good agreement. Without it, there may be a difference. Here, there is a correlation between the fluctuation of the subject moving speed and the fluctuation of the output of the angular velocity sensor. As shown in FIG. 2B, the angular displacement of the fluctuation is θ [deg], the subject distance is L, and the photographing magnification is β. When the subject shake displacement is D, the following relational expression is established.

D = βLπθ / 180 (1)
Therefore, if the subject moving speed is V _a and the fluctuation angular velocity is ω _a , the following relational expression is established.

V _a = βLπω _a / 180 (2)
By subtracting the fluctuation angular velocity ω _a from the angular velocity sensor output ω detected here, an angular velocity ω ₀ for performing clean panning, that is, for accurately following a moving subject is calculated as follows. .

ω ₀ = ω−ω _a
= Ω-180V _a / (βLπ) (3)
If the image blur correction lens 127 is driven so as to cancel the moving speed of the subject and the angular velocity of the panning shot in this way, the subject blurring during the panning shot is eliminated and a clean panning shot can be taken.

  The upper part of FIG. 3 shows a value obtained by converting the moving speed of the subject when the panning is performed by the method of FIG. 2 into an angular velocity, and the angular velocity at the time of panning output from the angular velocity sensor 135 in the interchangeable lens 102. The lower part shows the drive signal for the image blur correction lens 127. The driving signal is generated based on the angular velocity signal, the driving signal A in FIG. 3 is generated based on the panning angular velocity A, and the driving signal B is generated based on the panning angular velocity signal B.

  When performing panning shots, it is ideal to follow the subject angular velocity and the panning angular velocity so that they match during the exposure period, but it is difficult to follow the subject angular velocity so much that it is difficult to follow. Follow-up progress and follow-up delay occur. For example, as shown in FIG. 2, when the camera is shaken at a speed faster than the moving speed of the subject during exposure to perform panning, the image blur correction lens is used to cancel subject blur during exposure. It is driven in the plus direction shown in FIG. The state in which the tracking advance during exposure occurs is the relationship between the panning angular velocity A and the subject angular velocity as shown in FIG. 3, and the drive signal A is generated based on these two signals.

  In addition, when the camera is shaken at a speed slower than the moving speed of the subject during exposure and the panning is performed, the image blur correction lens moves in the minus direction shown in FIG. 2 in order to cancel the subject blur during the exposure. Driven. The state in which the follow-up delay occurs during exposure is the relationship between the panning angular velocity B and the subject angular velocity in FIG. 3, and the drive signal B is generated based on these two signals.

  However, actually, even when the image blur correction lens 127 is driven with the drive signal generated by the above procedure, the subject always flows a little due to factors such as the subject distance, the rotation center, and the sensor detection error. There is a possibility of taking a panning photo. In particular, failure of panning shots caused by subject distance and rotation center is likely due to the fact that the shift blur component is not included in the drive signal. Although it is possible to estimate and correct the shift blur component as an angular blur at a certain rotation center, an acceleration sensor is required to calculate the correction amount, which increases the number of parts. The embodiment of the present invention presents a form for making a panning success even when a shift blur component occurs due to the influence of the subject distance and the center of rotation or when a sensor detection error occurs. Specifically, by performing continuous shooting and changing the correction gain applied to the drive signal for each shooting frame, at least one of the continuous shooting is surely made a successful photo.

  FIG. 4 shows a value obtained by converting the moving speed of the subject into an angular velocity when the continuous shooting is performed in five continuous shots in one embodiment of the present embodiment, and a panning shot output from the angular velocity sensor 135 in the interchangeable lens 102. The angular velocity at the time, the exposure state of the camera, the correction gain applied to the drive signal of the image blur correction lens 127, and the drive amount of the image blur correction lens 127 are shown. The exposure is performed five times by performing five consecutive shots. During the exposure, the correction lens 127 is driven so as to cancel the deviation between the panning angular velocity and the subject angular velocity. Further, in order to make a panoramic photograph successful in at least one of the five exposures, the correction gain applied to the drive amount is changed little by little. Specifically, for example, as shown in FIG. 4, the correction gain is changed to x1.00, x1.05, x0.95, x1.10, x0.90,. Do. As a result, the actual drive amount changes as shown in FIG. 4 with respect to the drive amount with the correction gain of x1.00.

  Next, the above operation will be described with reference to the flowcharts of FIGS.

  First, the photographing operation on the camera body 101 side will be described with reference to the flowchart of FIG.

  If the main switch is turned on on the camera body 101 side, the operation starts from step 501.

  (Step 501) It is determined whether or not the release switch in the operation unit 121 of the camera body 101 is half-pressed (SW1 ON). If half-pressed, the process proceeds to step 502. If not half-pressed, the processing here ends.

  (Step 502) Camera lens status communication is performed with the lens MPU 124 via the interface circuits 122 and 123. Here, the camera state (release switch state SW1 ON, shooting mode, shutter speed, etc.) is transmitted to the lens, and the lens state (focal length, aperture state, focus lens drive state, etc.) is received. . Although the camera lens status communication is described only in the main part in the flowchart of the present embodiment, it is performed at any time when the camera state changes or when the camera wants to check the lens state.

  (Step 503) Since the release switch is pressed halfway (SW1 ON), the distance measuring means 109 measures the distance and calculates the focus lens drive amount for focusing on the subject.

  (Step 504) The focus lens drive amount is transmitted to the interchangeable lens 102. This data is transmitted, for example, as a drive target pulse amount of the focus encoder.

  (Step 505) When driving of the focus lens is completed, distance measurement is performed again.

  (Step 506) It is determined whether it is within the in-focus depth, and if it is within the in-focus depth, the process proceeds to Step 507.

  (Step 507) Since it is within the focus depth, focus display is performed. This is done by turning on an LED in the optical viewfinder 105 of the camera body 101 or generating a sound.

  (Step 508) A photometric result (luminance) is obtained from the photometric circuit 106, and an exposure time Tv and an aperture value (aperture drive amount) are calculated.

  (Step 509) The motion vector information of the subject is detected from the image signal of the photometry circuit 106 by the method as described above.

  (Step 510) Similarly, the position of the subject on the screen is detected from the vector information by the method as described above.

  (Step 511) A subject speed is calculated from the detected subject motion vector. This subject speed and subject position information calculated in the previous step are transmitted to the lens MPU 102.

  (Step 512) It is determined whether or not the release switch in the operation unit 121 of the camera body 101 is fully pressed (SW2 ON). If it is fully pressed, the process proceeds to step 513.

  (Step 513) Mirror up of the quick return primary mirror 103 is performed. At this time, the sub mirror 108 is also driven to the pentaprism 104 side together with the main mirror 103. At this time, the subject image that has entered the distance measuring means 109 is blocked.

  (Step 514) The aperture drive amount obtained in Step 508 is transmitted to the interchangeable lens 102, and the aperture 128 is driven.

  (Step 515) The front curtain shutter is driven.

  (Step 516) The subject image is exposed to the imaging unit 112 to accumulate charges.

  (Step 517) When the exposure time has elapsed, the rear curtain shutter is driven to end the exposure.

  (Step 518) Charge transfer (reading) from the imaging unit 112 is performed.

  (Step 519) The read captured image signal is converted into digital data through the CDS circuit 114, the gain control circuit 115, and the A / D converter 116, and stored in the buffer memory 118.

  (Step 520) An aperture opening command is transmitted to the interchangeable lens 102, and the aperture 128 is returned to the open position.

  (Step 521) The quick return main mirror 103 and the sub mirror 108 are mirrored down.

  (Step 522) Image correction processing such as gamma correction and compression processing is performed.

  (Step 523) The image data subjected to the image correction processing is displayed on the LCD 119 and recorded in the memory card 120, and a series of operations up to photographing is completed.

  Next, the operation on the interchangeable lens 102 side will be described with reference to the flowcharts shown in FIGS. 6, 7, 8 and 9. FIG.

  When the lens is attached to the camera, serial communication is performed from the camera to the lens, and the operation starts from step 601 in FIG.

  (Step 601) Initial setting for lens control and image blur correction control is performed.

  (Step 602) The state of switches (not shown) is detected and the position of zoom / focus is detected. Examples of the switches include a switch for switching between auto focus and manual focus, and an ON / OFF switch for an image blur correction function.

  (Step 603) It is determined whether there has been a focus drive command communication from the camera. If a focus drive command has been received, the process proceeds to step 604. If not received, the process proceeds to step 608.

  (Step 604) In the focus drive command communication from the camera, the target drive amount (number of pulses) of the focus lens is also transmitted, so the number of pulses of the focus encoder in the focus control circuit 129 is detected and the target number of pulses is driven. Focus drive control is performed.

  (Step 605) It is determined whether or not the target pulse number P has been reached. If the target has been reached, the process proceeds to step 606, and if not, the process proceeds to step 607.

  (Step 606) Since the target number of pulses has been reached, the driving of the focus lens is stopped.

  (Step 607) Since the target number of pulses has not been reached, the speed of the focus lens driving motor 130 is set according to the number of remaining driving pulses. Decreases as the number of remaining drive pulses decreases.

  (Step 608) If OFF of the image blur correction function ON / OFF switch is detected in Step 602, the image blur correction lens 127 is locked to the center of the optical axis. When ON is detected and the release switch SW1 ON of the camera is detected by camera lens status communication, the lock is released (unlocked), and the image blur correction operation is enabled.

  (Step 609) It is determined whether or not a command for stopping all driving (stopping all driving of actuators in the lens) is received from the camera. If no operation is performed on the camera side, the entire drive stop command is transmitted from the camera after a while.

  (Step 610) All drive stop control is performed. Here, all actuator driving is stopped, and the microcomputer is put into a sleep (stopped) state. The power supply to the image blur correction device is also stopped. Thereafter, when any operation is performed on the camera side, the camera sends a communication to the lens to cancel the sleep state.

  During these operations, if there is a request for serial communication interruption or image blur correction control interruption due to communication from the camera, such interruption processing is performed. The serial communication interrupt process decodes communication data and performs lens processing such as aperture driving and focus lens driving according to the decoding result. Then, SW1ON, SW2ON, shutter speed, camera model, and the like can be determined by decoding the communication data.

  The image blur correction interrupt is a timer interrupt that is generated at regular intervals, and performs pitch direction (vertical direction) control and yaw direction (horizontal direction) image blur correction control. First, the serial communication interrupt will be described with reference to the flowchart of FIG. When the communication from the camera is received, the operation starts from step 701.

  (Step 701) An instruction (command) from the camera is analyzed, and the process branches to a process corresponding to each instruction.

  (Step 702) If a focus drive command is received, the process proceeds to Step 703.

  (Step 703) The speed of the focus lens drive motor 130 is set in accordance with the target drive pulse number, and focus lens drive is started.

  (Step 704) If an aperture drive command is received, the process proceeds to Step 705.

  (Step 705) In order to drive the aperture 128 based on the transmitted aperture drive data, a drive pattern of the stepping motor 138 is set, and the set drive pattern is output to the stepping motor 138 via the aperture control circuit 137. The diaphragm 128 is driven.

  (Step 706) If the camera lens status communication is received, the process proceeds to Step 707.

  (Step 707) The focal length information of the lens, IS operation state, etc. are transmitted to the camera, and the camera status state (release switch state, shooting mode, shutter speed, etc.) is received.

  (Step 708) When the subject information reception command is received, the process proceeds to Step 709.

  (Step 709) The received subject blur speed data and subject position data are stored in the RAM in the lens MPU 124.

  (Step 710) If any other command is received, the process proceeds to Step 711.

  (Step 711) Other commands received in step 710 are, for example, lens focus sensitivity data communication, lens optical data communication, and the like, and those processes are performed in step 711.

  Next, image blur correction interruption will be described with reference to the flowchart of FIG. When an image blur correction interruption occurs during the main operation of the lens, the lens MPU 124 starts image blur correction control from step 801 in FIG.

  (Step 801) The ADC 136 performs A / D conversion on the signal of the angular velocity sensor 135.

  (Step 802) The state of the switch 139 is determined to determine whether the mode is the panning mode or the normal image stabilization mode. If the mode is the normal image stabilization mode, the process proceeds to Step 803; Go to 806.

  (Step 803) A high-pass filter operation is performed to cut low frequency components. The high-pass filter time constant is switched for a predetermined time from the start of calculation, and an operation for quickly stabilizing the signal is also performed.

  (Step 804) An integration operation is performed with the operation result of the high-pass filter as an input. This result is angular displacement data.

  (Step 805) The image stabilization sensitivity corresponding to the zoom position and the focus position is read, and the target drive amount of the blur correction lens 127 is calculated.

  (Step 806) If the panning mode has been selected, it is determined whether the panning mode reset has been completed. If it has been completed, the procedure proceeds to step 809, and if it has not been completed, the procedure proceeds to step 807.

  (Step 807) Since the panning mode reset has not been completed, the panning mode reset is performed. Specifically, the reset performed here is a flag used in the panning mode or a counter cleared to 0.

  (Step 808) The panning mode reset is completed. Specifically, for example, a reset completion flag is prepared and the flag is set.

  (Step 809) It is determined whether SW2 is ON, that is, whether an exposure operation is selected. If SW2 is OFF, the process proceeds to step 810, and if SW2 is ON, the process proceeds to step 812. The SW2ON signal is a signal that remains standing during the exposure, falls when the exposure is completed, and rises when the exposure operation is performed again.

  (Step 810) From the angular velocity sensor A / D conversion result and the subject blur velocity data received from the camera, the angular velocity for accurately following the moving subject is calculated as described above.

  (Step 811) The target drive amount 0 is set. This is because the correction lens 127 is electrically held in the center.

  (Step 812) Since SW2 ON, that is, the exposure operation is selected by the user in Step 809, the difference between the angular velocity of the subject calculated in Step 810 and the angular velocity of the panning obtained from the angular velocity sensor is calculated.

  (Step 813) The angular velocity calculated in Step 812 is integrated and angular displacement data is calculated.

  (Step 814) The image stabilization sensitivity corresponding to the zoom position and the focus position is read, and the target drive amount of the blur correction lens 127 is calculated. In this way, by driving the blur correction lens 127 so as to cancel the deviation between the moving speed of the subject and the current panning speed, there is no subject blur at the time of panning, and it is possible to shoot a panning picture with high accuracy. It becomes possible.

  (Step 815) A panning correction gain to be applied to the target driving amount of the blur correction lens 127 calculated in Step 814 is set. The flow of setting the panning correction gain will be described later with reference to FIG.

  (Step 816) A / D conversion is performed on the signal of the correction lens encoder 134 that detects the amount of eccentricity of the image blur correction lens 127, and the A / D result is stored in the RAM area in the lens MPU 124.

  (Step 817) A feedback calculation is performed.

  (Step 818) A phase compensation calculation is performed in order to obtain a stable control system.

  (Step 819) The calculation result of step 818 is output as PWM to the port of the lens MPU 124, and the image blur correction interruption ends. The output is input to a driver circuit in the IS control circuit 132, the image blur correction lens 127 is driven by the linear motor 133, and the image blur is corrected.

  Next, referring to FIG. 9, the setting process of the panning correction gain in the above-described step 815 will be described. In this embodiment, the exposure is performed five times as shown in FIG. 4, and the correction gain is set to x1.00, x1.05, x0.95, x1.10, x0.90,. A case where shooting is performed while being changed will be described with reference to a flowchart.

  (Step 901) It is determined whether or not the rising edge of the SW2ON signal, which rises when the user selects the exposure operation, is detected. If the timing when the SW2ON rising edge is detected, the process proceeds to Step 902. Otherwise, the process proceeds to Step 903. .

  (Step 902) The SW2ON_Cnt, which is a counter for counting the number of rises of SW2ON, is counted up. Note that SW2ON_Cnt is a counter that counts only the number of times SW2ON has risen, and therefore does not count up if SW2ON remains standing during exposure.

  (Step 903) If SW2ON_Cnt is 1, proceed to Step 904, otherwise proceed to Step 905.

  (Step 904) During the period when SW2ON_Cnt is 1, that is, during the first exposure, the panning correction gain is set to x1.00.

  (Step 905) If SW2ON_Cnt is 2, proceed to Step 906, otherwise proceed to Step 907.

  (Step 906) During the period when SW2ON_Cnt is 2, that is, during the second exposure, the panning correction gain is set to x1.05.

  (Step 907) If SW2ON_Cnt is 3, proceed to Step 908, otherwise proceed to Step 909.

  (Step 908) During the period in which SW2ON_Cnt is 3, that is, during the third exposure, the panning correction gain is set to x0.95.

  (Step 909) If SW2ON_Cnt is 4, proceed to Step 910, otherwise proceed to Step 911.

  (Step 910) During the period when SW2ON_Cnt is 4, that is, during the fourth exposure, the panning correction gain is set to x1.10.

  (Step 911) During the period when SW2ON_Cnt is 5, that is, during the fifth exposure, the panning correction gain is set to x0.90.

  (Step 912) It is determined whether or not the falling edge of the SW2ON signal has been detected. If detected, the process proceeds to step 913. Otherwise, the panning correction gain setting process is terminated. Here, as described above, the SW2ON signal is a signal that rises when exposure is started, remains standing during exposure, and falls when exposure is completed. Therefore, the process does not proceed to step 913 during the fifth exposure, but proceeds to step 913 when the fifth exposure is completed.

  (Step 913) Since the fall of SW2ON is detected, that is, the fifth exposure has been completed, the panning mode reset is made incomplete. Here, when the panning mode is in an incomplete state, the process proceeds to the panning mode reset processing in step 807, and SW2ON_Cnt is cleared to 0 in the reset processing.

  As described above, by using the embodiment of the present invention, it is possible to easily take a beautiful panoramic photograph in which the background of the main subject is not blurred, and the subject distance, rotation center, sensor detection error, etc. Even when the amount to be decentered deviates from the best due to a factor, for at least one of the exposures performed a plurality of times, it is possible to assist the panning with an eccentricity as close as possible to the best.

  In the present embodiment, an example in which the subject blur speed is detected by the camera photometry means is shown. However, even in an electronic viewfinder camera that does not have a quick return mirror or a camera that observes a subject image in live view shooting, If it is possible to calculate the vector information, the same effect can be obtained.

  In this embodiment, five consecutive shots are taken, and the panning correction gain is changed to x1.00, x1.05, x0.95, x1.10, x0.90, ... for each exposure. However, the number of times of continuous shooting is not limited to five, and the setting range of the correction gain is not limited to this. You can simply increase or decrease the number of continuous shots, or if you determine that the amount of decentration is likely to deviate based on detection results such as shutter speed, subject angular velocity, and panning angular velocity, increase the number of continuous shots, The setting range and setting method may be changed.

  In this embodiment, the correction gain applied to the driving amount of the blur correction lens is changed for each exposure. However, the correction gain applied to the panning angular velocity and the subject angular velocity is not set for each exposure, but for each exposure. The same effect can be obtained even if it is changed or the eccentricity sensitivity of the shake correction lens is changed.

  In the present embodiment, the case where five continuous shootings are performed has been described, but the present invention is not limited to continuous shooting. For example, even in shot shooting, if it is determined that panning is continued after the first exposure based on the detection results of the panning angular velocity and subject angular velocity, the panning correction gain is changed in the second exposure, Even if it is not continued, if it is determined that the subject and the shooting conditions are the same as the previous exposure, the correction gain may be changed at the next exposure. By doing so, as in the present embodiment, at least one of the exposures performed a plurality of times can be supplemented with a panning shot with an eccentricity close to the best.

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

101 camera body, 102 interchangeable lens, 106 photometric circuit,
107 camera MPU, 122 camera side interface circuit,
123 lens side interface circuit, 124 lens MPU,
125 focus lens, 126 zoom lens, 127 image stabilization lens,
132 image blur correction control circuit, 133 blur correction lens driving motor,
134 Lens encoder for blur correction, 135 Angular velocity sensor

Claims (5)

Blur detection means for detecting camera or shooting lens blur;
Panning speed calculating means for calculating a panning speed from the output of the blur detecting means;
Subject moving speed detecting means for detecting the subject moving speed in the shooting screen from the vector information of the subject image;
An optical axis decentering means capable of decentering the optical axis of the taking lens;
Having an eccentricity correction means capable of correcting the eccentricity of the optical axis eccentricity means,
Based on the difference between the panning speed and the subject moving speed, the blur correction unit is driven during exposure.
A camera, a lens, and a camera system, wherein a plurality of exposures are performed, and the eccentricity correction means changes the eccentricity of the optical axis eccentricity in at least one exposure.   The camera, lens, and camera system according to claim 1, wherein the eccentricity correction unit performs correction by changing a correction gain to be applied to the eccentricity for driving the optical axis eccentricity unit.   The camera, lens, and camera system according to claim 1, wherein the eccentricity correction unit performs correction by changing a correction gain applied to the panning speed.   The camera, lens, and camera system according to claim 1, wherein the eccentricity correction unit performs correction by changing a correction gain applied to the subject moving speed.   The camera, lens, and camera system according to claim 1, wherein the eccentricity correction unit performs correction by changing a shift lens eccentricity sensitivity.