JP2012100025A - Imaging apparatus and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus with a plurality of optical systems, capable of avoiding an improper imaging result by detecting occurrence of a step-out of driving means in any one of the optical systems.SOLUTION: An imaging apparatus can photograph a subject at the same time by a first optical system 100 and a second optical system 200. Imaging devices 105 and 205 photograph the subject via the respective optical systems. Each of driving control units 109 to 112 and 209 to 212 performs zoom control, focus control, and shutter and diaphragm control for the optical system. A stepping motor is used for driving means of an optical member. In the case that the driving means in the optical systems are synthesized under the same driving condition and are driven, a system control unit 118 compares driving control states of the optical systems. If the driving control states are different from each other, it is determined that any one of the driving means in the optical systems is in a step-out. After detection of the step-out, the system control unit 118 notifies a user of the detection result or continues the photographing operation by the operation of a correction drive sequence.

Description

  The present invention relates to a technique for simultaneously photographing a subject using a plurality of optical systems.

An imaging device capable of simultaneously photographing using a plurality of imaging optical systems is known. For example, stereo photography and panoramic photography are possible. In this type of optical system, usually two photographing lenses are arranged in parallel or on the left and right so as to form a constant convergence angle. Two images photographed simultaneously by the left and right optical systems are processed for stereoscopic viewing using stereo vision means, or are combined by a predetermined image processing circuit.
By the way, when a stepping motor is used as a drive source for moving the zoom lens and the focus lens, or a drive source for opening and closing the shutter, the control as intended cannot be performed when a step-out occurs. When performing stereo shooting, a stereo effect can be obtained on the premise that shooting is performed with the same driving conditions and exposure conditions for a plurality of imaging optical systems. If at least one of the plurality of imaging optical systems is out of step, an appropriate stereo image cannot be obtained.

Patent Document 1 discloses a stepping motor out-of-step detection device that performs out-of-step detection with low cost while reducing costs. In this apparatus, an encoder for feedback is attached to the stepping motor, and the generation of a response pulse from the encoder after a predetermined time has elapsed after the generation of the drive pulse to the stepping motor is detected. When no response pulse is generated for a certain time, a step-out is detected.
Patent Document 2 discloses a stereoscopic imaging apparatus that can increase the imaging time, can avoid interruption of imaging due to a failure, and can shoot an object satisfactorily. The apparatus detects the load of the motor from the change in impedance of the stepping motor, and performs imaging in the 2D imaging mode when it is determined that a failure has occurred.

JP-A-10-304700 JP 2001-16616 A

The above-mentioned Patent Document 1 aims to reduce the cost associated with step-out detection. However, since a feedback encoder is required, the cost increases accordingly. Moreover, in the said patent document 2, although the load of a stepping motor is detected, step-out detection is not performed.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to detect an out-of-step occurrence in a driving unit of any optical system in an imaging apparatus having a plurality of optical systems, and to avoid inappropriate imaging results.

  In order to solve the above problems, an apparatus according to the present invention is an imaging apparatus capable of imaging using a plurality of optical systems, the imaging means for imaging a subject through each of the plurality of optical systems, and the plurality of optical systems. A plurality of drive means for driving the plurality of drive means, a drive control means for controlling the plurality of drive means, respectively, and the plurality of optical systems when the drive means are driven in synchronism under the same drive conditions. A step-out determination unit that compares the drive control states of the optical systems and determines that at least one of the plurality of optical systems has stepped out when the drive control states do not match is provided.

  According to the present invention, in an imaging apparatus having a plurality of optical systems, it is possible to detect that a step-out has occurred in a driving unit of any one of the optical systems, and to avoid an inappropriate photographing result.

It is a block diagram explaining the structural example of the imaging device which concerns on embodiment of this invention. FIG. 2 is a block diagram illustrating a configuration example of a zoom drive control unit 109 and a focus drive control unit 112 in FIG. 1. It is a flowchart explaining the step-out determination process in 1st Embodiment of this invention. 4 is a flowchart illustrating an example of a zoom comparison process in FIG. 3. 4 is a flowchart illustrating an example of focus comparison processing in FIG. 3. 4 is a flowchart illustrating an example of aperture comparison processing in FIG. 3. It is a figure which shows the example of an image display at the time of a step-out generation | occurrence | production. It is a flowchart explaining the example of a zoom comparison process in 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating a configuration example of an imaging apparatus according to an embodiment of the present invention. The imaging apparatus shown in this example can simultaneously capture a plurality of images, and includes a first imaging optical system (hereinafter referred to as a first optical system) 100 and a second imaging optical system (hereinafter referred to as a second optical system) 200. Is provided. Each optical system has a three-group configuration and includes a zoom system, a shake correction system, and a focus system lens group. Hereinafter, the first group lenses 101 and 201 related to zoom control are referred to as zoom lenses, the second group lenses 103 and 203 related to shake correction are referred to as shift lenses, and the third group lenses 104 and 204 related to focus adjustment are referred to as “zoom lenses”. It will be called a focus lens.
First, the configuration of the first optical system 100 will be described. The zoom lens 101 is a magnification changing lens whose position can be changed along the optical axis direction. A zoom drive control unit 109 controls driving of the zoom lens 101. A shutter / aperture unit 102 is disposed at the rear stage of the zoom lens 101. A shutter / diaphragm drive control unit 110 that constitutes an exposure control unit drives and controls the shutter / diaphragm unit 102. The shift lens 103 is a lens constituting a shake correction optical system capable of changing the position in a plane substantially perpendicular to the optical axis. The shift lens drive control unit 111 controls driving of the shift lens 103. The focus lens 104 is a focus adjustment lens whose position can be changed along the optical axis direction. The focus drive control unit 112 controls the drive of the focus lens 104.
The imaging unit includes an imaging element 105 and an imaging signal processing unit 106. The image sensor 105 receives a light image that has passed through the lens group of the first optical system 100 and converts it into an electrical signal. The imaging signal processing unit 106 at the subsequent stage converts the electrical signal output from the imaging element 105 into a video signal and outputs the video signal to the video signal processing unit 107.

Since the configuration of the second optical system 200 is the same as that of the first optical system 100, portions corresponding to the respective components of the first optical system 100 in the second optical system 200 are used in the first optical system 100. The description is omitted by using a code obtained by adding 100 to the code.
The video signal processing unit 107 performs predetermined processing on the video signals output from the imaging signal processing units 106 and 206, and outputs a signal capable of video display to the display unit 108. A display unit 108 using a liquid crystal monitor or the like displays an image in accordance with an output signal from the video signal processing unit 107. The display control unit 113 controls the image sensors 105 and 205 and the display unit 108.
The control of the entire system is generally performed using a computer according to a program that is interpreted and executed. For example, a system control unit 118 using a CPU (Central Processing Unit) or the like controls the drive timing in addition to controlling the drive control unit of each optical system. The system control unit 118 compares the drive control state of each optical system using the drive information or imaging information of each optical system when each optical system is driven in synchronization with the same drive condition, and either drive Step-out determination processing is performed to determine whether the means has stepped out. The drive control state of the optical system is a state in which drive control of optical members such as a zoom lens, a focus lens, and a diaphragm is currently performed. For example, if there is a difference in the zoom driving state of each optical system, it appears as a difference in the angle of view between the optical systems. Details will be described later. The power supply unit 114 supplies a power supply voltage to each component of the system as necessary. The external input / output terminal unit 115 receives a communication signal, a video signal, and an audio signal transmitted to an external device (not shown) or outputs these signals from the terminal unit. The operation unit 116 is used for user operation of the imaging apparatus, and includes various operation switches of the apparatus main body, operation switches of the remote operation apparatus, and the like. The storage unit 117 is used to store various data such as video information, time information, and setting information. The storage unit 117 further stores various programs that are interpreted and executed by the system control unit 118.

Next, the operation of the imaging apparatus having the above configuration will be described. The operation unit 116 includes a two-stage switch in which a first switch (hereinafter referred to as SW1) and a second switch (hereinafter referred to as SW2) are sequentially turned on in accordance with the pressing amount of the shutter release button. When the user presses the shutter release button about halfway, SW1 is turned on, and when the user presses the shutter release button deeply to the end, SW2 is turned on.
When SW1 of the operation unit 116 is turned on, the system control unit 118 receives the signal and sends control signals to the focus drive control units 112 and 212 and the shutter / aperture drive control units 110 and 210, respectively. Accordingly, the focus drive control units 112 and 212 drive the focus lenses 104 and 204, respectively, to adjust the focus to the in-focus position. The shutter / aperture drive control units 110 and 210 drive the shutter / aperture units 102 and 202, respectively, to set the exposure amount to an appropriate value.
Further, when SW2 is turned on, the system control unit 118 receives the signal, and causes the storage unit 117 to store the image data obtained from the light images exposed on the imaging elements 105 and 205. At this time, if there is an ON instruction for operating the shake correction function from the operation unit 116, the system control unit 118 sends control signals to the shift lens drive control units 111 and 211, respectively, and performs the shake correction operation. Instruct. Receiving this, the shift lens drive control units 111 and 211 perform the shake correction operation by driving the shift lenses 103 and 203, respectively, until an instruction to turn off the shake correction function is given.
When the operation unit 116 has not been operated for a certain period of time or more, the system control unit 118 supervises power management by issuing a power supply cutoff instruction to the display unit 108 and the like in order to reduce power consumption. When the system control unit 118 receives an instruction for a zooming operation using the zoom lenses 101 and 201 from the operation unit 116, the zoom drive control units 109 and 209 that receive the instruction from the system control unit 118 include the zoom lenses 101 and 201. 201 is driven. The zoom lenses 101 and 201 move to the designated zoom position. Along with this movement, the system control unit 118 detects the focus state of each optical system based on the image information processed by the image pickup signal processing units 106 and 107 after the image pickup devices 105 and 205 pick up images, and instructs focus control. To do. Upon receiving an instruction from the system control unit 118, the focus drive control units 112 and 212 drive the focus lenses 104 and 204, respectively, to perform focus adjustment.

FIG. 2 is a block diagram illustrating a configuration example of the zoom drive control unit 109 and the focus drive control unit 112 of the first optical system 100. The drive motor (see 301 and 306) of each drive control unit is a stepping motor.
In the zoom drive control unit 109, the zoom motor 301 moves the zoom lens 101 along the optical axis. The zoom motor drive circuit 302 outputs a drive signal to the zoom motor 301 to drive it. As a position detection unit of the zoom lens 101, a zoom reset position detection unit 303 and a zoom position detection unit 304 are provided. The zoom reset position detection unit 303 detects the reset position of the zoom lens 101 and acquires a reference position for zoom control. The zoom position detection unit 304 detects the absolute position of the zoom lens 101. The zoom control unit 305 controls the movement amount of the zoom lens 101 according to the detection signal output from the zoom position detection unit 304, and rotates the zoom motor 301 via the zoom motor drive circuit 302 according to the control amount.
In the focus drive control unit 112, the focus motor 306 moves the focus lens 104 along the optical axis. The focus motor drive circuit 307 drives the focus motor 306 by outputting a drive signal. A focus reset position detection unit 308 is provided as a position detection unit for the focus lens 104, and acquires a reference position for focus control. A focus control unit 309 controls the focus movement amount. The focus position detection unit 310 drives the focus lens 104 to detect the focus position of the subject based on the image obtained by the image sensor 105 shown in FIG. 1, that is, the exposed image. Note that the zoom drive control unit 209 and the focus drive control unit 212 of the second optical system 200 have the same configuration as that of the first optical system 100, and thus the description thereof is omitted.
At the time of shooting a stereo image, the system control unit 118 has the same zoom lens position and the same focus lens position in the first optical system 100 and the second optical system 200, and each of them can obtain an equivalent exposure state. Control the drive controller. Then, when SW2 is turned on, the system control unit 118 controls driving of the shutter so that the photographing timings of both optical systems are synchronized. However, even if the two optical systems are driven synchronously under the same driving conditions, if there is a difference in the drive control state, an appropriate stereo image cannot be obtained.

FIG. 7 is a display example of an image taken when there is a difference in the driving state of the optical systems 100 and 200. Image examples 701 to 703 shown on the left are images displayed on the display unit 108 by the video signal processing unit 107 processing the imaging signal from the imaging signal processing unit 106 obtained through the first optical system 100. Further, image examples 704 to 706 shown on the right side are images displayed on the display unit 108 by the video signal processing unit 107 processing the imaging signal from the imaging signal processing unit 206 obtained through the second optical system 200.
FIG. 7 shows an example in which a different image was obtained because the stepping motor stepped out in one optical system drive control. FIG. 7A shows an example of an image when a step-out occurs in one of the zoom drive control units 109 and 209. It can be seen that there is a field angle difference between the image examples 701 and 704 by each optical system, and the size of the subject image is different. FIG. 7B shows an example of an image when a step-out occurs in one of the focus drive control units 112 and 212. It can be seen that there is a difference in the focusing results of the subject between the image examples 702 and 705 by each optical system. FIG. 7C shows an example in which a step-out has occurred in one of the shutter / diaphragm drive controllers 110 and 210. It can be seen that there is a difference in brightness between the image examples 703 and 706 by each optical system. In either case, the driving states of the optical systems 100 and 200 are not the same, and a difference occurs in the control result, so that an appropriate stereo image cannot be obtained.

[First Embodiment]
The optical system step-out detection method according to the first embodiment of the present invention will be described below with reference to FIGS.

FIG. 3 is a flowchart for explaining step-out detection of each of the zoom, focus, and diaphragm drive units in the process from the start to the end of the stereo shooting operation.
By operating a mode switch (not shown) provided on the operation unit 116, the user designates the stereo shooting mode as the shooting mode. In response to this, the system control unit 118 issues control instructions to the first optical system 100 and the second optical system 200, respectively.
First, in step S101 in FIG. 3, the system control unit 118 determines whether or not an instruction to change the imaging magnification is received from the operation unit 116. As a result, if there is an instruction to change the imaging magnification, the process proceeds to S102, and if there is no change instruction, the process proceeds to S105. In S102, the zoom drive control units 109 and 209 move the zoom lenses 101 and 201, respectively, in the direction of the instruction according to the instruction to change the imaging magnification. In the next S103, zoom comparison control of the zoom lenses 101 and 201 is performed. Details of the zoom comparison processing by the system control unit 118 will be described later with reference to FIG. The comparison result is temporarily stored in the storage unit 117, and then the process proceeds to S104. If the comparison result of the zoom drive state between the two optical systems matches, the process returns to S101, and if the comparison result does not match, the process proceeds to S116.
In step S <b> 105, the system control unit 118 determines the operation state of the shutter release button of the operation unit 116. As a result, when the ON state of SW1 is detected, the process proceeds to S106, but when the OFF state of SW1 is detected, the process returns to S101.

In S106, the system control unit 118 performs a focus state detection process, and detects the amount of defocus of each optical system. In S <b> 107, the focus drive control units 112 and 212 select the focus lenses 104 and 204 according to the distance from the imaging device to the subject (subject distance) and the amount of focus deviation calculated from the current positions of the focus lenses 104 and 204. Are moved to their respective in-focus positions. In the next S108, focus comparison processing of the focus lenses 104 and 204 is performed. Details of the focus comparison process will be described later with reference to FIG. The comparison result is temporarily stored in the storage unit 117, and then the process proceeds to S109. If the comparison results of the focus drive state match, the process proceeds to S110, and if the comparison results do not match, the process proceeds to S116.
In S110, photometric processing is performed in accordance with an instruction from the system control unit 118. In S111, the system control unit 118 calculates the aperture value and the exposure time according to the measured value of the brightness of the subject, and the shutter / aperture drive control units 110 and 210 operate the shutter / aperture units 102 and 202 based on the aperture value. Drive. In the next S112, aperture comparison processing of the shutter / aperture units 102 and 202 is performed. Details of the aperture comparison process will be described later with reference to FIG. The comparison result is temporarily stored in the storage unit 117, and then the process proceeds to S113. If the comparison results of the aperture control match, the process proceeds to S114, and if the comparison results do not match, the process proceeds to S116.
In step S <b> 114, the system control unit 118 determines again the operation state of the shutter release button of the operation unit 116. As a result, when the ON state of SW2 is detected, the process proceeds to S115, and when the OFF state of SW2 is detected, the process returns to S101.

In step S115, the system control unit 118 performs stereo shooting processing. After exposure processing of each optical system is performed, readout processing of electrical signals output from the image pickup devices 105 and 205 is performed. The photographing data of each optical system is stored in the storage unit 117, and this process ends.
In step S116, the system control unit 118 performs error termination processing. This is because, in the two optical systems, any comparison result did not match as a result of the zoom comparison process, the focus comparison process, and the aperture comparison process. The system control unit 118 displays a message for notifying the user that an error has occurred on the display unit 108 via the display control unit 113. The notification means for notifying the user of the occurrence of step-out may be notified by voice instead of the alarm display on the display unit 108 or together with the alarm display. The system control unit 118 refers to the comparison processing result stored in the storage unit 117, performs a reset operation of the drive control unit related to the comparison processing that did not match, and then ends this processing.

Next, the zoom comparison process in S103 will be described with reference to FIG. The following processing is performed based on a comparison of field angle information of each optical system under the control of the system control unit 118.
First, in S201, an imaging signal is acquired from the imaging signal processing units 106 and 206 of each optical system. In next S202, the convergence point information of each optical system is acquired. The convergence point refers to the point where the optical axes of the two optical systems intersect to eliminate parallax, and the distance from the device to the convergence point varies depending on the zoom position. By acquiring the convergence point information, it is possible to determine a region where images overlap each other between the images indicated by the imaging signals obtained by the two optical systems. The next step S203 is a process for calculating the field angle difference between the two optical systems and comparing it with a threshold value for the overlapping imaging regions. The storage unit 117 stores information indicating a permissible amount of field angle difference for obtaining an image with an appropriate stereo effect according to the zoom position. An allowable range of field angle difference is defined by the determination reference value indicated by this information, and comparison processing is performed with reference to the range. If the field angle difference with respect to the zoom position is within the predetermined range indicated by the determination reference value, the process proceeds to S204, and if the field angle difference is outside the predetermined range, the process proceeds to S205. In S204, the system control unit 118 determines that the zoom comparison results match, and in S205, determines that the zoom comparison results do not match. After S204 and S205, the process proceeds to S206, the comparison result data is stored in the storage unit 117, and the zoom comparison process ends.

Next, the focus comparison process in S108 will be described with reference to FIG. The following processing is performed based on the captured image processing by the imaging signal processing units 106 and 206 under the control of the system control unit 118.
First, in S301, focus evaluation values are acquired from the imaging signal processing units 106 and 206 of each optical system. As the focus evaluation value representing the focus detection state, for example, a focus evaluation value at the time of scanning the center of the image is used. The reason is that the two optical systems are compared at a place with as little parallax as possible. The next step S302 is processing for calculating a difference in focus evaluation values and comparing it with a threshold value. The storage unit 117 stores information indicating an allowable amount of evaluation value difference that can obtain an image with an appropriate stereo effect according to the distance information. The allowable range of the evaluation value difference is defined by the criterion value indicated by this information, and the comparison process is performed with reference to the range. If the evaluation value difference with respect to the distance information is within a predetermined range indicated by the determination reference value, the process proceeds to S303, and if it is outside the predetermined range, the process proceeds to S304. In S303, the system control unit 118 determines that the focus comparison results match, and in S304, determines that the focus comparison results do not match. After S303 and S304, the process proceeds to S305, where the comparison result data is stored in the storage unit 117, and the focus comparison process ends.

Next, the aperture comparison process in S112 will be described with reference to FIG. The following processing is performed based on comparison of luminance information of each captured image under the control of the system control unit 118.
First, in S401, luminance data is acquired from the imaging signal processing units 106 and 206 of each optical system. The next step S402 is processing for calculating a luminance difference and comparing it with a threshold value. The storage unit 117 stores information indicating an allowable amount of luminance difference that can obtain an image with an appropriate stereo effect according to luminance. The allowable range of the luminance difference is defined by the determination reference value indicated by this information, and the comparison process is performed with reference to the range. If the luminance difference with respect to the luminance is within the predetermined range, the process proceeds to S403, and if it is out of the predetermined range, the process proceeds to S404. In S403, the system control unit 118 determines that the luminance comparison results match, and in S404, determines that the luminance comparison results do not match. After S403 and S404, the process proceeds to S405, the comparison result data is stored in the storage unit 117, and the aperture comparison process ends.

In the first embodiment, in an imaging apparatus having a plurality of optical systems, it is determined that one of the driving units has stepped out by comparing the drive control states of the driving units related to the plurality of optical systems. That is, the drive control states of the drive units related to the two optical systems 100 and 200 are compared, and if the comparison results do not match, it is determined that one of the drive units has stepped out. In this case, there is no need to identify an optical system that may have lost the step, and by detecting the step-out of one of the plurality of optical systems, it is possible to capture an image that does not provide a stereo effect. Can be avoided.
In this embodiment, when the comparison result does not match, the drive control unit is reset. However, the present invention is not limited to this, and there is a possibility that the user cannot obtain the stereo effect by continuing the shooting operation. This may be notified.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the first embodiment, error processing is performed immediately after step-out detection. However, in the second embodiment, after the step-out detection, a correction drive sequence is executed and control for continuing the stereo photographing operation is performed. Note that the overall control flow of the zoom, focus, and aperture drive units in the process from the start to the end of the stereo shooting operation is as shown in FIG. 3, and the following is the case of the first embodiment. The zoom comparison process with different operations will be described.

  FIG. 8 is a flowchart for explaining an example of zoom comparison processing according to the second embodiment. During zoom driving, the trajectory of the motion vector of the same point of interest on the captured image is detected for each of the first optical system 100 and the second optical system 200. A motion vector can be detected from a captured image of each optical system by a known method. If the difference between the scalar quantities of the motion vectors for the two optical systems is within an allowable amount for obtaining an image with an appropriate stereo effect, it can be determined that the zoom driving of the two optical systems is normally performed in the same state. On the other hand, when the locus of the motion vector is interrupted for one of the optical systems and does not follow the drive instruction of the motor, the motor has stepped out during zoom driving of the optical system, so normal drive Is determined to have failed. By detecting and comparing the motion vectors at the time of zoom driving, it is possible to determine the step-out of the motor at the time of zoom driving and identify the optical system in which the step-out has occurred. The difference between FIG. 8 and FIG. 4 is S503 and S505 to 508 between S202 and S204, and these processes will be described below.

S503 is a process of calculating a scalar amount difference between the motion vectors of the two optical systems and comparing the difference with a threshold value. The storage unit 117 stores information indicating an allowable amount of a scalar difference between motion vectors that can obtain an image with an appropriate stereo effect according to the zoom position. The allowable range of the scalar amount difference is defined by the determination reference value indicated by this information, and the comparison process is performed with reference to the range. If the difference in the scalar quantity of the motion vector with respect to the zoom position is within a predetermined range indicated by the determination reference value, the process proceeds to S204, and it is determined that the zoom comparison results match. On the other hand, if the scalar amount difference between the motion vectors is outside the predetermined range, the system control unit 118 identifies an optical system in which the motor may have stepped out of the motion vector locus, and the process proceeds to S505.
In step S505, angle of view control of the two optical systems is performed. The zoom lens 101 is step-driven in the Tele (Wide) direction or the Wide (Wide) direction in order to match the optical system that may have stepped out of the motor to the angle of view of the normally driven optical system. For example, when it is determined that the zoom motor 301 of the first optical system 100 has stepped out, the system control unit 118 issues a control command to the zoom control unit 305. The zoom control unit 305 moves the zoom lens 101 by step driving of the zoom motor 301. At that time, using the convergence point information acquired in S202, processing for comparing the angles of view of the two optical systems in the overlapping imaging signal regions is performed. In step S506, the system control unit 118 determines whether the angles of view of the two optical systems match. If the angle of view does not match, the process returns to S505 and the angle-of-view matching control is repeated. If the angles of view match, the process proceeds to S507. In step S <b> 507, the storage unit 117 stores the number of correction steps for zoom correction required for adjusting the angle of view in step S <b> 505 together with the step direction (corresponding to the moving direction of the zoom lens). In the next step S508, processing for reflecting the number of correction steps stored in step S507 in the drive control of the motor is performed. For example, the zoom correction step number is 30 steps in the Tele direction. The first optical system 100 determined to be out of step has the same angle of view as the second optical system 200 that has been normally driven by the additional driving of 30 steps in the Tele direction. Is merely a state where the motor is stopped at the position corresponding to the drive step specified immediately before. That is, it is necessary to perform a correction process for changing the number of drive steps so that the relationship between the stop position and the drive step matches. If this process is not performed, the relationship between the stop position and the drive step is lost. For example, the zoom lens may collide with the control end in the drive control range exceeding the maximum drive step number. Or, the zoom position is not reflected correctly, and the acquisition of distance information in the focus operation is affected. In order to prevent these, the system control unit 118 performs the correction process of S508, and returns the drive control after the occurrence of the step-out to normal. After S508, the process proceeds to S204.

According to the second embodiment, it is possible to specify which optical system out of the plurality of optical systems is out of step by zoom comparison processing using a motion vector. Further, after the step-out detection, the control is performed so as to continue the stereo photographing operation by executing the correction drive sequence. Further, the storage unit 117 stores the number of correction steps necessary to match the zoom position of the optical system determined that the motor step-out has occurred with the zoom position of the normally driven optical system. The number of drive steps is changed so that the relationship between the stop position of the motor and the drive step matches, and it is possible to prevent the subsequent zoom operation and focus operation from being affected.
In the second embodiment, the zoom lens is driven when performing the angle-of-view adjustment control. However, the angle of view may be adjusted using digital zoom that is electronically performed in image processing. In the second embodiment, step-out detection when the zoom lens is driven has been described. However, step-out detection when the focus lens is driven can also be performed.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

100 1st optical system 101, 201 1st group lens (zoom lens)
102, 202 Shutter / aperture unit 104, 204 Third lens group (focus lens)
105, 205 Image sensor 108 Display unit 109, 209 Zoom drive control unit 110, 210 Shutter / aperture drive control unit 112, 212 Focus drive control unit 118 System control unit 200 Second optical system 301 Zoom motor 306 Focus motor

Claims (8)

An imaging device capable of photographing using a plurality of optical systems,
Imaging means for imaging each subject through the plurality of optical systems;
A plurality of driving means for respectively driving the plurality of optical systems;
Drive control means for controlling each of the plurality of drive means;
When the drive means is driven in synchronism with the plurality of optical systems under the same drive conditions, the drive control states of the plurality of optical systems are compared, and when the drive control states do not match, the plurality of optical systems An image pickup apparatus comprising a step-out determination unit that determines that at least one drive unit out of step. The drive control means performs zoom control of the optical system,
The step-out determination means calculates the field angle difference related to the plurality of optical systems using the field angle information of the plurality of optical systems, and when the field angle difference exceeds a preset range, the plurality of optical systems The imaging apparatus according to claim 1, wherein it is determined that one of the driving units related to zoom control of the system has stepped out. The drive control means performs focus control of the optical system,
The step-out determination unit acquires focus evaluation values of the plurality of optical systems, and when the difference between the focus evaluation values exceeds a preset range, any driving unit related to focus control of the plurality of optical systems The image pickup apparatus according to claim 1, wherein the image pickup apparatus determines that stepping out has occurred. The drive control means performs aperture control of the optical system,
The step-out determination unit calculates the luminance difference related to the plurality of optical systems using luminance information of the captured image, and relates to aperture control of the plurality of optical systems when the luminance difference exceeds a preset range. The imaging apparatus according to claim 1, wherein any one of the driving units is determined to have stepped out.   The out-of-step determination means has a step out of the trajectory of the motion vector of the point of interest on the captured image related to the plurality of optical systems, and thus which of the driving means related to the plurality of optical systems is out of step. The imaging apparatus according to claim 1, wherein it is specified whether or not it has been performed. When the step-out determination unit determines that at least one drive unit of the plurality of optical systems has stepped out, the drive state of the drive unit specified by the step-out determination unit is not determined as step-out. It further comprises correction means for matching the driving state of the driving means of the other optical system,
The correcting means changes the number of driving steps for the driving means specified by the out-of-step determining means, using the number of correction steps when matched with the driving state of the driving means of the other optical system. The imaging apparatus according to claim 5.   7. The step-out determination unit according to claim 1, further comprising a notification unit configured to notify the user when the step-out determination unit determines that at least one of the plurality of optical systems has stepped out. The imaging apparatus of any one of Claims. A control method executed by an imaging device capable of photographing using a plurality of optical systems,
A drive control step for controlling the driving means of the plurality of optical systems in order to respectively image the subject through the plurality of optical systems;
The drive control states of the plurality of optical systems are compared when the drive means of the plurality of optical systems are driven in synchronism under the same drive condition in the drive control step, and the plurality of optical systems are compared when the drive control states do not match. And a step-out determination step for determining that at least one drive unit has stepped out of the optical system.

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