JP7241511B2 - Imaging device and its control method - Google Patents

Description

The present invention relates to an imaging device and its control method.

2. Description of the Related Art Conventionally, digital (video) cameras are known to acquire signals for various purposes from an imaging device. Japanese Unexamined Patent Application Publication No. 2002-200000 discloses an imaging device in which a plurality of pixels are divided into a first pixel group and a second pixel group on a row-by-row basis and configured to be readable. A technique for switching between using the image signal obtained from the first pixel group and the image signal obtained from the second pixel group for the same purpose and using them for different purposes is disclosed.

JP 2014-143667 A

In the technique disclosed in Japanese Patent Application Laid-Open No. 2002-200010, image signals suitable for two uses can be obtained by using different readout methods (charge accumulation time and frame rate) for the first pixel group and the second pixel group. However, if an image signal suitable for another application is required, it is necessary to change the readout method for one of the pixel groups. Since an image signal cannot be obtained while the reading method is being changed, the display may stop or the responsiveness of the imaging device may be lowered (for example, shutter time lag).

The present invention has been made in view of such problems of the prior art. An object of the present invention is to provide an imaging device and a control method thereof that can reduce the influence of the time required for changing the operation of the imaging device when it is necessary to change the readout method of the imaging device. That's what it is.

The above-described object is to obtain means for obtaining the first image data and the second image data from the imaging element, and to generate information for focus detection of the photographing lens based on the second image data, and obtain the first image data. It has signal processing means for generating image data for display based on the data, and control means for controlling the readout method of the image sensor and the operation of the signal processing means, wherein the control means detects an instruction to prepare for still image shooting. Then, in order to use the first image data as image data for determining the amount of light emission of the flash, the reading method for acquiring the first image data is changed, and based on the second image data This is accomplished by an imaging device characterized by controlling signal processing means to generate image data for display.

According to the present invention, it is possible to provide an imaging apparatus and a control method thereof that can reduce the influence of the time required for the change on the operation of the imaging apparatus when it is necessary to change the readout method of the imaging device. can be done.

1 is a block diagram showing a functional configuration example of a digital camera as an example of an imaging device according to an embodiment; FIG. FIG. 2 is a block diagram showing an example of the functional configuration of the imaging element in FIG. 1; Timing chart of control operation example according to the embodiment Flowchart of an example of control operation according to the embodiment FIG. 4 is a block diagram showing an example of functional configuration of a digital camera according to a modified example of the embodiment;

Exemplary embodiments of the invention are described in detail below with reference to the drawings. A digital camera will be described below as an example of an imaging device according to an embodiment of the present invention. However, the present invention is applicable to any electronic device or machine that can use an imaging device. Such electronic devices and machines include, but are not limited to, personal computers, tablet computers, media players, PDAs, game consoles, robots, home appliances, automobiles, and the like.

FIG. 1 is a block diagram showing a functional configuration example of a digital camera 100 (hereinafter simply referred to as camera 100) according to this embodiment. In this embodiment, the camera 100 has a structure in which the photographing lens 120 can be attached and detached via the lens mount 102, but the photographing lens 120 may not be detachable.

A photographing lens 120 is an optical system that forms an optical image of a subject on the image sensor 110 . The lens 101 includes a plurality of lenses including movable lenses such as a focus lens and a variable power lens, an aperture with a variable aperture size, a drive circuit for the variable lens and the aperture, and the like. The lens control unit 141 has a processor (computer), ROM, and RAM. The lens control unit 141 loads a program stored in the ROM into the RAM and executes the program in the processor, thereby controlling operations of the lens 101 including control of the drive circuit. Power for the taking lens 120 is supplied from the camera body through the lens mount 102 . Also, the lens control unit 141 and a camera control unit 131 (to be described later) can communicate bidirectionally through the lens mount 102 .

A shutter 103 is a focal plane shutter that adjusts the exposure time of the image sensor 110 when shooting a still image. Note that the exposure time of the imaging device 110 may be adjusted by an electronic shutter (driving control of the imaging device 110).

The imaging element 110 includes a plurality of pixels (pixel group) arranged in a matrix. Each pixel is provided with, for example, a color filter, a microlens, a photoelectric conversion unit, and the like. The imaging element 110 converts an optical image formed on an imaging surface by the lens 101 into an electric signal (pixel signal) using a plurality of pixels. In this embodiment, the imaging device 110 includes an AD converter to convert pixel signals into digital data. In addition, the image sensor 110 can divide the pixel signals read from the pixel group into two and output them.

Here, details of the imaging device 110 will be described with reference to FIG. FIG. 2 is a diagram showing a circuit configuration example of the imaging device 110 using functional blocks. The image sensor 110 includes a pixel group 201 , a row scanning circuit 202 , a column ADC block 203 , a column scanning circuit 204 , a selector 205 , a frame memory 206 , an image conversion section 207 and a parallel/serial conversion section (P/S conversion section) 208 . have.

Each of the plurality of pixels forming the pixel group 201 accumulates charges according to the intensity of incident light during the exposure period. A row scanning circuit 202 selects pixels of a pixel group 201 on a row-by-row basis, and converts a voltage (pixel signal) obtained by converting charges accumulated in the selected pixels into a column ADC block 203 having an AD converter provided for each pixel column. AD conversion with . Then, the column scanning circuit 204 selects the AD converters in the column ADC block 203 one by one and reads the pixel signals, thereby obtaining a group of digitized pixel data (image data) for one pixel row. be able to.

The selector 205 can allocate areas in the frame memory 206 in which the read pixel data are stored in conjunction with the operation of the column scanning circuit 204 . The selector 205 switches write addresses so that, for example, data in columns 4n (n is an integer equal to or greater than 0) and 4n+1 and data in columns 4n+2 and 4n+3 are stored from different start addresses in the frame memory 206. . In this way, the imaging device 110 can acquire two types of image data in parallel. In the present embodiment, these two types of image data are called main data and sub-data, respectively. Moving image data whose frames are main data is called a main stream, and moving image data whose frames are sub-data is called a sub-stream. It should be noted that how pixel data is allocated to main data and sub-data is not limited to the above example.

In the image sensor 110, separate readout methods (charge accumulation time, frame rate, presence/absence of addition readout, etc.) can be set for main data pixel rows and sub-data pixel rows. The reading method of the image sensor 110 can be controlled by a timing control signal given to the image sensor 110 by the timing generator 142 . Therefore, by controlling the timing generating section 142 by the camera control section 131, it is possible to change the method of reading out the pixel rows for main data and/or the pixel rows for sub data. For example, timing control patterns corresponding to a plurality of readout methods of the image pickup device 110 are registered in advance in the timing generation unit 142, and the timing control pattern is specified from the camera control unit 131, thereby changing the readout method of the image pickup device 110. may

The image conversion unit 207 can apply conversion processing such as resizing processing to frames of the main stream and sub-stream read from the frame memory 206 .

The P/S conversion unit 208 performs parallel/serial conversion and outputs the image data converted into serial data from the imaging element 110 . The P/S converter 208 can output the main stream to the main lane 111 and the sub-stream to the sub-lane 112 . As shown in FIG. 1, the main lane 111 and the sub-lane 112 are signal paths that connect the imaging element 110 and the signal processing section 121 . The P/S converter 208 can output the main stream and sub-stream in parallel.

The signal processing unit 121 applies predetermined image processing to image data (main stream and sub-stream frames) input through the main lane 111 and sub-lane 112 . Image processing applied by the signal processing unit 121 includes correction processing such as white balance adjustment, color interpolation, color correction, γ conversion, edge enhancement, resolution conversion, and noise reduction. The signal processing unit 121 can generate display image data from image data after image processing. The image data for display can be generated by, for example, matching the resolution of image data after image processing with the resolution of the display area of the display unit 153 . If the reading resolution is equal to the display resolution, the image data after the image processing may be used as the display image data as it is. Note that display image data may be generated by other methods.

In addition, the signal processing unit 121 can also apply analysis processing such as acquisition of image luminance and contrast information, and subject detection and/or recognition to image data after image processing. Information obtained by analysis processing can be used for automatic exposure control (AE) and automatic focus detection (AF), for example. When the image sensor 110 has focus detection pixels, the signal processing unit 121 can generate a pair of image signals for performing phase difference detection AF by analysis processing. Note that the image processing listed here is an example of analysis processing, and not all of them are essential, and other processing may be applied.

The signal processing unit 121 can apply similar processing to the main stream and the sub-stream. The signal processing unit 121 outputs the processed main stream and sub-stream to the memory 132 via the bus 150 . Also, the signal processing unit 121 outputs information obtained by the analysis processing to the camera control unit 131 through the bus 150 .

The memory 132 is a system memory used for temporarily storing image data and the like, programs executed by the camera control unit 131, variable values during execution of the programs, and the like. The memory 132 is also used as a VRAM for storing image data for display.

The nonvolatile memory 133 stores programs executed by the camera control unit 131, GUI data, various setting values, and the like. Note that the nonvolatile memory 133 may be rewritable.
The timing generation unit 142 generates and provides signals for controlling operations of the imaging device 110, the signal processing unit 121, and the like.
Bus 150 provides a communication path for communicating data, control signals, etc. between connected components.

The display unit 153 is, for example, a color liquid crystal display, and is used to display captured images, various information of the camera 100, GUI screens, and the like. By continuously displaying moving images on the display unit 153 while shooting, the display unit 153 can function as an electronic viewfinder (EVF). A display image for causing the display unit 153 to function as an EVF is also called a live view image. The display unit 153 is provided with a touch panel 156 and functions as a touch display. The camera control unit 131 can detect the position and type of operation on the touch panel 156 .

The display control unit 151 transfers the display image data stored in the VRAM area of the memory 132 to the D/A conversion unit 152 and/or HDMI (registered trademark) output terminal 155 . The D/A converter 152 converts the image data into an analog image signal for display, and outputs the analog image signal to the display 153 and/or the VIDEO output terminal 154 .

The card input/output unit 171 can record data on a recording medium 173 (for example, a memory card) detachably inserted into the card slot 172 and read data recorded on the recording medium 173 .

The light emission control section 181 controls the light emission pattern and light emission amount of the built-in flash 182 and/or the external flash 183 according to instructions from the camera control section 131 .
The operation unit 161 is a general term for switches, buttons, dials, and the like provided on the housing of the camera 100 . The operating unit 161 generally includes, but is not limited to, a power switch, a release button, a release switch, direction keys, a SET button, a menu button, and the like. The release switch has a first switch SW1 which is turned on when the release button is half-pressed, and a second switch SW2 which is turned on when the release button is fully pressed. The control unit 131 recognizes the ON of SW1 as an instruction to prepare for still image shooting, and the ON of SW2 as an instruction to start still image shooting. Execute each.
A power supply 160 supplies power to each unit of the camera 100 .

The camera control unit 131 has a processor such as a CPU, loads a program stored in the nonvolatile memory 133 into the memory 132 and executes it, and controls the operation of each unit of the camera 100 through the bus 150 to control the operation of the camera 100 . Realize the function. In this embodiment, the camera control section 131 realizes control of each section of the camera 100 through the lens control section 141 , the timing generation section 142 , the signal processing section 121 , the display control section 151 and the light emission control section 181 . However, the camera control section 131 may be configured to directly control each section of the camera 100 . Alternatively, the camera control unit 131 may not be provided, and each unit of the camera 100 may be controlled by performing control (processing) in conjunction with the above-described control unit and processing unit.

The camera control unit 131 can also perform AE and AF using information acquired by the signal processing unit 121 through analysis processing. For example, the camera control unit 131 can determine exposure conditions such as shutter speed, aperture value, shooting sensitivity, and flash emission amount based on settings related to exposure control and luminance information of an image. Further, the camera control unit 131 can adjust the focus of the interchangeable lens 120 by driving the focus lens included in the lens 101 based on the contrast information and the phase difference between the image signals. Note that when detecting a subject such as a face in analysis processing, the detection result can also be used for AE or AF. Since known techniques can be used for the AE and AF operations performed by the camera control unit 131, further detailed description will be omitted.

Next, timing control from the standby state of still image shooting to the start of shooting in the camera 100 will be described with reference to the timing chart of FIG. 3 and the flowchart of FIG. A standby state for still image shooting is a state in which the power switch of the camera 100 is ON, the operation mode of the camera 100 is set to the shooting mode, and both the first switch SW1 and the second switch SW2 are OFF. It is also assumed that the flash needs to be turned on during recording, for example, the forced flash mode is set.

In a standby state for still image shooting, the control unit 131 starts moving image shooting (S101), and executes the following processes in parallel.
・Processing using substreams (S111 to S115)
・Display stream selection processing (S121 to S123)
・Processing using the main stream (S131 to S138)
Here, it is assumed that the shooting frame rate of moving images is 60 fps, and the display frame rate of the display unit 153 is 30 fps.

In S111, S121, and S131, the camera control unit 131 determines whether or not to end the shooting standby process, and if it is determined to end, the process proceeds to S140.
In this embodiment, the camera control unit 131 can determine to end the shooting standby process when, for example, an instruction to change to the playback mode, an ON operation of the second switch SW2, and an OFF operation of the power switch are detected. However, these are examples, and it may be determined to end the shooting standby process based on other conditions.

First, processing in a state until the first switch SW1 is turned on will be described.
In this state, the camera control unit 131 advances the process to S123 in the determination process of S122 in the display stream selection process (S121 to S123). Then, in S123, the camera control unit 131 determines to display the display image data generated from the main stream, and notifies the signal processing unit 121 of the decision.

The signal processing unit 121 acquires the sub-stream and main stream output in parallel from the imaging device 110 (S112, S132), and applies image processing. Then, under the control of the camera control unit 131 , the signal processing unit 121 generates image data for display (live view image data) from the image data after image processing of the main stream and stores it in the VRAM area of the memory 132 . The signal processing unit 121 further applies analysis processing to the image data after the image processing of the substream, and supplies analysis results (for example, contrast information for focus detection) to the camera control unit 131 .

Here, as a reading method of the image sensor 110 in the still image shooting standby state, it is assumed that the pixel rows for main data are read at 30 fps and the pixel rows for sub data are read at 60 fps.

The signal processing unit 121 generates display image data of 30 fps from the main stream, and sequentially stores it in the VRAM area of the memory 132 . The display control unit 151 reads display image data from the VRAM area of the memory 132 and causes the display unit 153 to display the data through the D/A conversion unit 152 . Accordingly, the display unit 153 functions as an EVF in the still image shooting standby state.

On the other hand, the signal processing unit 121 executes analysis processing for each frame of the substream, and outputs the analysis result to the camera control unit 131 at 60 times/second. The camera control unit 131 can, for example, monitor changes in analysis results (for example, contrast information) while reciprocally driving (wobbling) the focus lens of the lens 101 in a minute range, and grasp the in-focus state of the lens 101 . By moving the center position of the reciprocating drive of the focus lens as necessary, the in-focus state of the lens 101 can follow the movement of the subject. Also, the camera control unit 131 detects the focus lens position where the contrast is maximized as the in-focus position from the contrast information obtained during wobbling (S113).

Note that when an image signal pair used for phase difference detection AF processing is obtained in the analysis processing, the camera control unit 131 detects the phase difference between the image signals and converts the phase difference into a defocus amount. Since the defocus amount represents the direction and amount of movement of the focus lens to the in-focus position, the camera control unit 131 drives the focus lens of the lens 101 to the in-focus position based on the defocus amount. Driving the focus lens and diaphragm included in the lens 101 is realized by giving commands from the camera control unit 131 to the lens control unit 141 .

FIG. 3 is a diagram chronologically showing the usage of the main stream and the sub-stream and the related processing in the period before and after the first switch SW1 is turned ON. Note that the description “for AF” in FIG. 3 is for the sake of convenience, and actually indicates that the purpose is to acquire analysis results for use in AE and AF. As shown in FIG. 3, during the period until SW1 is turned ON, the main stream is for display and the sub stream is for AF (analysis).

Next, the operation when the release button is half-pressed, the first switch SW1 is turned on, and the second switch SW2 is turned off will be described.
When the release button of the operation unit 161 is half-pressed and the first switch SW1 is turned ON, the camera control unit 131 advances the process to S124 in the determination process of S122 in the display stream selection process (S121 to S123). Then, in S<b>124 , the camera control unit 131 determines to display the display image data generated from the substream, and notifies the signal processing unit 121 of the decision.

As a result, the signal processing unit 121 changes the operation so as to generate display image data of 30 fps matching the display frame rate of the display unit 153 from the substream read out at 60 fps, and store the data in the VRAM 132 . do. There is no particular limitation on the method for lowering the frame rate, and two frames of data may be added, or frames may be thinned.

In addition, in the process using the main stream, the camera control unit 131 advances the process from the determination process of S133 to S134 to change the method of reading the main stream from the image sensor 110 . Specifically, the reading method is changed to acquire image data for determining the amount of light emitted by the flash. This corresponds to changing the usage of the main stream to control the amount of light emission.

Here, the reason why the method of reading the main stream instead of the sub-stream is changed is that the driving operation of the focus lens based on the analysis result and the determination of the amount of flash light emission using the pre-flash cannot be executed in parallel. If you continue to use the main stream for display and change the purpose of the sub stream to control the amount of light emitted by the flash, you will need to change the method of reading out the pixel rows for sub data after the focus lens has been moved to the in-focus position. be. The waiting time until the reading method can be changed becomes a factor that increases the release time lag.

By changing the readout method of the main stream, it is possible to change the readout and drive the focus lens in parallel, so pre-flash can be performed immediately after the focus lens is driven, shortening the release time lag. .

It should be noted that in order to accurately determine the amount of light emission when photographing for recording, it is necessary to acquire data of an image that has been entirely exposed by pre-light emission. When the timings of accumulation (exposure) and readout are different for each row, as in the image sensor 110, it is necessary to wait for pre-light emission until the exposure period for all rows to be read out. In order to shorten this standby time, the camera control unit 131 reduces the number of pixel rows for main data, performs pixel addition, or reduces the accumulation time, thereby increasing the readout frame rate. You can change the method.

Then, in S135, the camera control unit 131 determines whether or not the image data before pre-light emission has been acquired.
In S136, the camera control unit 131 causes the signal processing unit 121 to store image data after image processing (image data during non-emission) obtained from the main stream after changing the reading method in a region other than the VRAM area of the RAM 132, The process returns to S131. It should be noted that the process of changing the reading method in S134 does not have to be executed for the second and subsequent times.

In S<b>137 , the camera control unit 131 causes the built-in flash 182 or the external flash 183 to emit pre-light through the light emission control unit 181 . Then, the signal processing unit 121 is caused to store image data after image processing obtained from the main stream (image data at the time of pre-emission) outside the VRAM area of the RAM 132, and the process proceeds to S138.

In S138, the camera control unit 131 causes the signal processing unit 121 to calculate the difference between the image data during non-light emission and the image data during pre-light emission. Then, the camera control unit 131 determines the amount of flash light emitted when shooting for recording based on the difference. In addition, the camera control unit 131 determines the exposure conditions (shutter speed, aperture, and photographic sensitivity) at the time of photographing for recording based on the image data at the time of pre-light emission and the determined amount of light emission. After that, the camera control unit 131 repeatedly executes S131 and S132.

On the other hand, in processing the substream, the signal processing unit 121 generates image data for display (live view image data) from the image data after the image processing of the substream, and stores it in the VRAM area of the memory 132 . The signal processing unit 121 further applies analysis processing to the image data after the image processing of the substream, and supplies analysis results (for example, contrast information) to the camera control unit 131 .

Further, the camera control unit 131 advances the process from the determination process of S114 to S115, and drives the focus lens to the in-focus position obtained in S113. After that, the camera control unit 131 returns the processing to S111.

As shown in FIG. 3, when the first switch SW1 is turned ON, the main stream readout method is changed, and furthermore, the live view image is changed from the main stream to the sub stream, so that the live view display is not interrupted. found to be maintained. Furthermore, by executing focusing control of the lens 101 using the sub-stream and changing the reading method of the main stream in parallel, pre-emission can be performed immediately after the completion of driving the focus lens.

After that, for example, when the second switch SW2 is turned on, the camera control unit 131 advances the process to S140 and further to S150, and executes still image shooting for recording. At this time, the camera control unit 131 lights the flash with the light emission amount determined by the pre-light emission through the light emission control unit 181 . If the still image shooting standby process is terminated for a reason other than turning ON of SW2, the process ends directly from S140.

It should be noted that here, the flash is forced to emit light, but for example, whether or not the flash needs to be turned on may be determined as a result of executing the AE process based on the analysis result in S113.

(Modification)
Note that the configuration using the imaging device 110 capable of outputting two pieces of image data in parallel has been described here. However, a configuration in which two image data are acquired in parallel by another method may be used. For example, as shown in FIG. 5, a half mirror 104 may be used, and the reflected and transmitted object optical images may be captured by a first imaging device 113 and a second imaging device 114, respectively.

Further, in the present embodiment, a case has been described in which the reading method is changed in order to change the application of image data from display to flash light emission control. However, the present invention is also applicable when other uses are changed. For example, by switching the main stream between normal photometry and high-brightness photometry while performing focus detection using the sub-stream, photometry with a wide dynamic range may be realized. In this case, the camera control unit 131 performs photometric processing using image data after image processing obtained from the main stream.

Then, after normal photometry (for example, photometry based on an image captured under proper exposure conditions) is completed, the camera control unit 131 changes the method of reading out the pixel rows for main data to the method for acquiring image data for high-brightness photometry. Change the reading method. Image data for high-brightness photometry may be read out using a readout method that requires a shorter charge accumulation time than image data for normal photometry. The camera control unit 131 controls the signal processing unit 121 so that the display image data is used for normal photometry processing, and the display image data is generated from the substream during readout method switching processing and during high-brightness photometry. do.

According to this embodiment, of the two image data acquired in parallel, one image data is used for focus detection and the other image is used for purposes other than focus detection, and the reading method of the image sensor is changed. In this case, the reading method for the other image data is changed. As a result, the focus detection operation and the read change process can be executed in parallel, so that, for example, the shutter time lag can be shortened. Furthermore, if one image data is used for the purpose of the other image data, the processing using the other image data can be continued without interruption.

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

DESCRIPTION OF SYMBOLS 100... Imaging device, 110... Imaging element, 121... Signal processing part, 131... Camera control part, 141... Lens control part, 151... Display control part, 181... Light emission control part

Claims (10)

Acquisition means for acquiring the first image data and the second image data from the imaging element;
signal processing means for generating information for focus detection of a photographing lens based on the second image data and generating image data for display based on the first image data;
a control means for controlling the readout method of the imaging element and the operation of the signal processing means;
When an instruction to prepare for photographing a still image is detected, the control means acquires the first image data to use the first image data as image data for determining the amount of flash light emission. changing the reading method and controlling the signal processing means to generate image data for display based on the second image data;
An imaging device characterized by: 2. The imaging according to claim 1 , wherein said control means further drives a focus lens of said photographing lens based on information generated based on said second image data when said preparation instruction is detected. Device. 3. The image pickup apparatus according to claim 2 , wherein said control means further causes a flash to pre-emission when driving of said focus lens is completed. Acquisition means for acquiring the first image data and the second image data from the imaging element;
signal processing means for generating information for focus detection of a photographing lens based on the second image data and generating image data for display based on the first image data;
a control means for controlling the readout method of the imaging element and the operation of the signal processing means;
When an instruction to prepare for still image shooting is detected, the control means selects a reading method for acquiring the first image data in order to use the first image data as image data for high-brightness photometry. and controlling the signal processing means to generate display image data based on the second image data. 5. The method according to claim 4 , wherein the control means changes the readout method for acquiring the first image data to a readout method with a shorter charge accumulation time than before detection of the preparation instruction. Imaging device. 6. The method according to any one of claims 1 to 5 , wherein the first image data and the second image data are image data read from different pixel rows of the image sensor. Imaging device. 6. The method according to any one of claims 1 to 5 , wherein said imaging device includes a first imaging device for acquiring said first image data and a second imaging device for acquiring said second image data. The imaging device according to any one of items 1 and 2. an acquisition step of acquiring the first image data and the second image data from the imaging element;
a signal processing step of generating information for focus detection of a photographing lens based on the second image data and generating image data for display based on the first image data;
When a still image shooting preparation instruction is detected, the reading method for acquiring the first image data is changed so as to use the first image data as image data for determining the amount of light emitted by the flash. a control step of controlling the signal processing step to generate image data for display based on the second image data;
A control method for an imaging device, comprising : an acquisition step of acquiring the first image data and the second image data from the imaging element;
a signal processing step of generating information for focus detection of a photographing lens based on the second image data and generating image data for display based on the first image data;
When a still image shooting preparation instruction is detected, the reading method for acquiring the first image data is changed in order to use the first image data as image data for high-brightness photometry, and a control step of controlling the signal processing step to generate image data for display based on the second image data;
A control method for an imaging device, comprising: A program for causing a computer of an imaging device to function as control means of the imaging device according to any one of claims 1 to 7 .

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