JP2020088754A - Imaging device - Google Patents

Abstract

To provide an imaging device capable of improving flickering of a display image, and suppressing occurrence of deterioration in tracking performance in a case where there is the effect of rolling distortion in an imaging drive mode having different readout time.SOLUTION: The imaging device comprises: imaging means for converting an optical image of a subject into an image signal; control means for controlling a first imaging mode for reading out an image signal from the imaging means and a second imaging mode having a readout speed slower than the first imaging mode; movement detection means for detecting movement; and display means for displaying a first image signal read out in the first imaging mode and a second image signal read out in the second imaging mode, therein the control means changes a readout timing of the first imaging mode in accordance with a detection result of the movement detection means when the display means displays the first image signal and the second image signal repeatedly read out by using the first imaging mode and the second imaging mode.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method of controlling an image pickup device.

2. Description of the Related Art In recent years, in digital still cameras, an imaging mode using slit rolling readout of an image sensor has been provided as a mode in which mechanical operation noise of a shutter is suppressed and images can be captured quietly. Further, when the image pickup device is driven by slit rolling reading, the continuous shooting speed is easily increased as compared with the case where a mechanical shutter is used.

However, in slit rolling reading, a time difference of accumulation occurs in the image pickup screen, so that a phenomenon in which an image of a moving object is distorted (hereinafter sometimes referred to as rolling distortion) occurs. Since this phenomenon depends on the readout time of the image sensor, the amount of distortion varies depending on the image capture drive mode. In order to cope with this problem, Patent Document 1 discloses a method for realizing a reading method in which rolling distortion is different between a still image and a moving image having different reading times.

JP, 2018-125697, A

However, in the method of Patent Document 1, it is necessary to significantly change the structure of the image pickup device itself, and this change may affect basic performance such as S/N and dynamic range of the image pickup device.

Therefore, an object of the present invention is to provide an image pickup apparatus capable of improving the flicker of a display image and suppressing the occurrence of tracking performance deterioration in the case where there is an influence of rolling distortion in an image pickup drive mode having different read times. It is to be.

In order to achieve the above object, the present invention provides an image pickup means for converting an optical image of a subject into an image signal, a first image pickup mode for reading the image signal from the image pickup means, and the first image pickup mode. A control unit for controlling a second image pickup mode whose reading speed is slower than that, a motion detecting unit for detecting a movement, a first image signal read in the first image pickup mode, and a second image pickup mode. Display means for displaying the read second image pickup signal, and the first image signal and the second image signal repeatedly read using the first image pickup mode and the second image pickup mode. Is displayed on the display means, the control means changes the read timing of the first imaging mode according to the detection result of the motion detection means.

According to the present invention, it is possible to provide an image pickup apparatus capable of improving the flicker of a display image and suppressing the occurrence of tracking performance deterioration when there is an influence of rolling distortion in an image pickup drive mode having different read times. Is possible.

It is a block diagram of the present invention. It is the figure which showed the imaging flow of this invention. It is the figure which showed the imaging timing chart of this invention. 6 is a timing chart showing a change in read timing according to the present invention. It is the figure which showed the timing chart by the shutter system of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration example of an image pickup apparatus according to an embodiment of the present invention. The imaging device 100 according to the present embodiment is, for example, a digital camera and has a still image capturing function and a moving image capturing function. The still image capturing function can not only generate still image data in the JPEG (Joint Photographic Experts Group) format, but also acquire uncompressed RAW format still image data. Further, in the moving image capturing function, it is possible to acquire moving image data in a 4K format or an 8K format at a frame rate of 30 frames or more per second.

<First Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

In FIG. 1, 100 is an imaging device. Reference numeral 10 is an imaging lens, 12 is a mechanical shutter having a diaphragm function, 14 is an image sensor for converting an optical image into an image signal, and 16 is an A/D converter for converting an analog signal output of the image sensor 14 into a digital signal. .. A timing generation circuit 18 supplies a clock signal and a control signal to the image pickup device 14 and the A/D converter 16, and is controlled by the memory control circuit 22 and the system control circuit 50. In addition to the 12 mechanical shutters, the storage timing can be controlled as an electronic shutter by controlling the reset timing of the 18 image sensor, and the electronic shutter can be used for capturing moving images. Although the image sensor 14 and the A/D converter 16 have different configurations in FIG. 1, they may be integrally configured including a part of an image processing circuit 20 described later.

An image processing circuit 20 performs predetermined pixel interpolation processing and color conversion processing on the data from the A/D converter 16 or the data from the memory control circuit 22. Further, the electronic zoom function is realized by cropping an image and performing a scaling process by the 20 image processing circuits.

Further, in the image processing circuit 20, predetermined arithmetic processing is performed using the captured image signal, and the system control circuit 50 controls the exposure control means 40 and the distance measurement control means 42 based on the obtained arithmetic result. I do. In addition, TTL AF processing, AE processing, and EF processing are performed.

Further, the image processing circuit 20 performs predetermined arithmetic processing using the captured image signal, and also performs TTL AWB (auto white balance) processing based on the obtained arithmetic result.

A memory control circuit 22 controls the A/D converter 16, the timing generation circuit 18, the image processing circuit 20, the memory 30, and the compression/expansion circuit 32. The data of the A/D converter 16 is written into the memory 30 via the image processing circuit 20 and the memory control circuit 22, or the data of the A/D converter 16 is directly written into the memory 30.

Reference numeral 28 denotes an image display unit including a TFT LCD, and the image signal for display written in the memory 30 is displayed by the image display unit 28 via the memory control circuit 22. The electronic viewfinder function can be realized by sequentially displaying image signals picked up by the image display unit 28.

Further, the image display unit 28 can arbitrarily turn on/off the display according to an instruction from the system control circuit 50, and when the display is turned off, the power consumption of the imaging device 100 can be significantly reduced. I can.

Reference numeral 30 denotes a memory for storing captured still images and moving images, and has a storage capacity sufficient to store a predetermined number of still images and moving images for a predetermined time. This makes it possible to write a large amount of images in the memory 30 at high speed even in continuous shooting or panoramic shooting in which a plurality of still images are continuously shot. The memory 30 can also be used as a work area of the system control circuit 50.

Reference numeral 31 is a non-volatile memory composed of a flash ROM or the like. The program code executed by the system control circuit 50 is written in the non-volatile memory 31, and the program code is executed while being sequentially read. In addition, an area for storing system information and an area for storing user setting information are provided in the non-volatile memory, and various information and settings are read out and restored at the next startup.

Reference numeral 32 denotes a compression/expansion circuit for compressing/expanding an image signal by adaptive discrete cosine transform (ADCT) or the like, which reads an image stored in the memory 30 to perform compression processing or expansion processing, and stores the processed data in the memory 30. Write in.

An exposure control unit 40 controls the shutter 12 having a diaphragm function, and also has a flash dimming function by interlocking with the flash 48. Reference numeral 42 is a distance measurement control unit that controls focusing of the image pickup lens 10, and 44 is a zoom control unit that controls zooming of the image pickup lens 10. A flash 48 has an AF auxiliary light projection function and a flash light control function.

The exposure control unit 40 and the distance measurement control unit 42 are controlled by using the TTL method, and the system control circuit 50 causes the exposure control unit 40 and the distance measurement to be performed based on the calculation result obtained by calculating the captured image signal by the image processing circuit 20. The control means 42 is controlled.

A system control circuit 50 controls the entire imaging device 100. It includes a CPU (Central Processing Unit). The system control circuit 50 sets various setting parameters and the like for each component. Further, by executing the program recorded in the memory or the like, each processing described in this embodiment described later is realized. Further, the system control circuit 50 includes a system memory, and for example, a RAM is used. In the system memory, constants and variables for the operation of the system control circuit 50, programs read from the nonvolatile memory and the like are expanded. The non-volatile memory is an electrically erasable/recordable memory, and for example, a flash memory or the like is used. The non-volatile memory may store constants for operating the system control circuit 50, programs, and the like. The program referred to here is a program for executing various controls described later in this embodiment. The system control circuit 50 may include a hardware circuit including a reconfigurable circuit in addition to the CPU that executes the program.

Reference numerals 60, 62, 64, 66, 70, and 72 are operation means for inputting various operation instructions of the system control circuit 50, and are a single unit such as a switch, a dial, a touch panel, pointing by visual line detection, a voice recognition device, or the like. It is composed of multiple combinations. Here, a concrete description of these operating means will be given.

Reference numeral 60 denotes a mode dial switch, which can switch and set various functional modes such as power-off, automatic image capturing mode, image capturing mode, panoramic image capturing mode, moving image capturing mode, reproduction mode, and PC connection mode.

Reference numeral 62 denotes a shutter switch SW1, which is turned on during operation of the shutter switch and instructs the start of operations such as AF (auto focus) processing, AE (auto exposure) processing, and AWB (auto white balance) processing.

Reference numeral 64 denotes a shutter switch SW2, which is turned on when the operation of the shutter switch is completed. In the case of flash imaging, after performing EF (flash pre-emission) processing, the image sensor 14 is exposed for the exposure time determined by the AE processing. In the case of flash imaging, light is emitted during this exposure period and the exposure control means 40 blocks light at the same time as the end of the exposure period, thus ending the exposure to the image sensor 14. The signal read from the image sensor 14 is read out by writing the image signal in the memory 30 via the A/D converter 16 and the memory control circuit 22. Then, the image processing circuit 20 and the memory control circuit 22 perform a development process using an operation, the image signal is read from the memory 30, and the compression/expansion circuit 32 performs compression. Next, an instruction is given to start the operation of a series of processes called a recording process for writing an image signal on the recording medium 200.

A display changeover switch 66 can change the display of the image display unit 28. With this function, it is possible to save power by cutting off current supply to the image display unit 28 including a TFT LCD or the like when an image is captured using the optical finder 104. The display changeover switch 66 may be provided around the optical finder 104. As a result, when the optical finder 104 is used, the power supply to the image display unit 28 can be automatically cut off.

Reference numeral 70 denotes an operation unit including various buttons, a touch panel, a rotary dial, and the like, which includes a menu button, a set button, a macro button, a multi-screen playback page break button, a flash setting button, a single shooting/continuous shooting/self timer switching button, and the like. .. Also, menu move + (plus) button, menu move-(minus) button, playback image move + (plus) button, playback image move-(minus) button, image quality selection button, exposure compensation button, date/time setting button, etc. There is also.

Reference numeral 72 denotes a zoom switch unit as a zoom operation unit that allows the user to instruct to change the magnification of the captured image. Hereinafter, it is also referred to as the zoom switch 72. The zoom switch 72 is composed of a tele switch for changing the image pickup angle of view to the telephoto side and a wide switch for changing the image pickup angle of view to the wide angle side. By using this zoom switch 72, it becomes a trigger for instructing the zoom control means 44 to change the imaging angle of view of the imaging lens 10 and performing an optical zoom operation. The image processing circuit 20 also serves as a trigger for clipping an image and electronically changing the imaging angle of view by pixel interpolation processing or the like.

A thermistor 74 measures the temperature inside the image pickup apparatus 100. Since the defective pixel of the image sensor is affected by the temperature, it is necessary to change the scratch correction process depending on the temperature at the time of image capturing. The thermistor is arranged in the image pickup device near the image pickup device 14 and measures the temperature of the image pickup device 14 itself.

Reference numeral 86 is a gyro for detecting blurring and movement of the image pickup apparatus 100 itself. Image stabilization is performed according to the detection result of blurring, or motion amount detection for switching the read timing of live view imaging is performed according to the motion amount of the image capturing apparatus 100, which is a feature of the present invention. Further, the motion vector information may be calculated based on the image acquired from the image pickup device 14 to detect the blurring of the image pickup apparatus 100 itself.

Reference numeral 90 is an interface with the recording medium 200 such as a memory card or hard disk, and 92 is a connector for connecting to the recording medium 200 such as a memory card or hard disk.

A communication unit 110 has various communication functions such as USB, IEEE1394, LAN, and wireless communication.

Reference numeral 112 denotes a connector for connecting the image pickup apparatus 100 to another device by the communication unit 110 or an antenna in the case of wireless communication.

Reference numeral 200 is a recording medium such as a memory card or a hard disk. The recording medium 200 includes a recording unit 202 including a semiconductor memory and a magnetic disk, an interface 204 with the imaging device 100, and a connector 206 for connecting to the imaging device 100. 210 is a recording medium such as a memory card or a hard disk.

The image capturing apparatus 100 according to the present embodiment includes an optical finder 104 and a protection unit (not shown) that is a barrier that prevents the image capturing unit from being soiled or damaged by covering the image capturing unit including the image capturing lens 10. The optical finder 104 can perform imaging using only the optical finder 104 without using the electronic finder function of the image display unit 28. However, the electronic finder using a high-definition display such as an organic EL display is used. It may be configured as a finder.

FIG. 2 is a diagram showing a continuous imaging flow of the present invention. If continuous imaging has been set based on an instruction from the user or the like, the system control circuit 50 starts the continuous imaging operation triggered by the pressing of the shutter switch 64. The shutter speed, aperture value, and sensitivity to be imaged are exposed using the set values that are previously determined by the automatic exposure control or the set values that the user has arbitrarily instructed.

First, in step S101, the system control circuit 50 sets a parameter for still image capturing in the image sensor 14 and executes a storage operation. Then, after the accumulation based on the incident light, the read operation of the still image pickup including the conversion operation by the A/D converter 16 and the like is performed. Then, the read image signal is stored in the memory 30 after being subjected to predetermined processing by the image processing circuit 20 or the like. Then, the process proceeds to step S102.

In step S102, the system control circuit 50 detects the movement of the imaging device 100 itself or the movement amount of the subject based on the output of the gyro 86 or the like and the image signal. Then, the process proceeds to step S103. Although the amount of motion is detected as the presence or absence of motion in the present embodiment, it may be acquired in vector format or as coordinates on the image.

In step S103, the system control circuit 50 changes the read speed of the live view imaging based on the detection result of the motion amount detected in step S102. Specifically, the parameter setting for live view imaging is set in the image sensor 14 and the accumulation operation is executed. Then, after the accumulation based on the incident light, the readout operation of the live view imaging including the conversion operation by the A/D converter 16 and the like is performed. Then, the read image signal is displayed on the image display unit 28 or the like that has been subjected to predetermined processing by the image processing circuit 20 or the like. Then, the process proceeds to step S104. Note that this operation will be described in detail with reference to FIG.

In step S104, the system control circuit 50 determines whether or not continuous imaging is to be continued based on whether or not the shutter switch operation is being continued. If it is determined to continue, the process returns to step S101, and if it is determined not to continue, the continuous image capturing operation in this flowchart ends. It should be noted that a method other than the operation of the shutter switch may be used to determine whether or not to continue the continuous image capturing. For example, when performing the continuous image capturing within a predetermined period, the determination may be made based on the elapsed time. Good.

FIG. 3 is a diagram showing a timing chart according to the continuous imaging flow shown in FIG. 2 in the present invention. FIG. 3 shows an operation based on a vertical synchronization signal (hereinafter, may be referred to as VD) supplied from the timing generation circuit 18 to the image sensor 14 under the control of the system control circuit 50. More specifically, it shows the operation of repeatedly performing the accumulation ACC and the read READ every time the VD is supplied, and continuously acquiring the image signal for the actual subject as the acquired image.

FIG. 3A is a timing chart when it is determined in step S102 of FIG. 2 that there is no motion based on the motion detection result. When there is no motion, the effect of rolling distortion is small, and therefore live view imaging has the same readout timing as usual. That is, since the motion is small, the rolling distortion amounts in the acquired images are substantially the same even if the difference in the read speed between the live view imaging and the still image imaging is large.

Here, the live view imaging operation will be described in detail. The image signal acquired by the live view image pickup is mainly used for display on the image display unit 28, but the number of dots of the image display unit 28 (corresponding to the number of pixels of the image pickup device) is smaller than the number of pixels of the image pickup device 14. Therefore, in the live view imaging of the present embodiment, the thinning-out reading operation for thinning out the pixels to be read is performed. Therefore, it is possible to realize the read-out faster than the still image pickup. Specifically, when still image capturing can acquire 30 image signals per second, and when thinning out to 1/3 in each of the row direction and the column direction, an image signal of 270 images, which is about 9 times, is generated. You can get it. Under such a premise, when reading is normally performed in live view imaging, a period in which reading is not performed (hereinafter, may be referred to as vertical blanking period) can be set longer than in still image capturing. During this vertical blanking period, it is possible to stop power supply to circuits related to reading such as the A/D converter 16 (hereinafter, also referred to as power saving operation), and suppress unnecessary power consumption.

FIG. 3B is a timing chart when it is determined that there is motion based on the motion detection result in step S102 of FIG. When there is motion as shown in FIG. 3B, the acquired image is affected by rolling distortion. That is, the distortion amount of the acquired image changes with respect to the real subject based on the reading speed. Usually, the still image pickup and the live view image pickup have different read speeds, and thus the distortion amounts in the respective images are different. However, the imaging apparatus of the present embodiment changes the read speed of live view imaging based on the detection result of the motion amount as shown in step S103 of FIG. More specifically, when a moving subject is imaged, the reading speed in live view imaging is set to be slow so that the difference from the reading speed in still image imaging becomes small. As a method of setting the delay time, there is a method of lowering the input clock frequency or increasing the length of the horizontal synchronization period (hereinafter, sometimes referred to as HD period) corresponding to the read time for one row. In this way, by slowing down the read speed of the live view image pickup in accordance with the still image image pickup, the amounts of rolling distortion in the acquired images in both image pickup operations become substantially the same. As a result, in a scene affected by rolling distortion, the rolling distortion of still image capturing and live view capturing can be made uniform, and it is possible to suppress flickering in display and deterioration in tracking performance.

Table 1 is a table showing changes in the read timing depending on the motion detection result. Here, a case will be described in which the output of the gyro 86 is used to detect the amount of motion of the image capturing apparatus 100 and the amount of motion of the subject is detected from the motion vector information in the captured image signal. In the present embodiment, the system control circuit 50 determines the drive timing of live view imaging based on the respective detection results. As an example, when the movement of the image pickup apparatus 100 is large even if the movement of the subject is small, rolling distortion has an effect, and therefore the live view image pickup is performed at a slow read timing equivalent to that of the still image pickup. In addition, even if the movement of the image pickup apparatus 100 is small, if the movement of the subject is large, rolling distortion has an effect, so that the live view image pickup is performed at a read timing equivalent to the still image image pickup. When both the movement of the image pickup apparatus 100 and the movement of the subject are moderate or more, the influences of the two overlap, and therefore, the live view image pickup is performed at the read timing equivalent to the still image image pickup. On the other hand, under the conditions other than the above, since the effect of rolling distortion is small, live view imaging is performed at the same timing as usual in order to reduce power consumption. That is, when each motion amount is compared with a predetermined threshold value and it is determined that the motion amount is large as a result of the comparison, the live view imaging is performed at a read timing equivalent to the still image imaging.

Table 2 is a table showing the read timing changes when the focal length of the imaging lens 10 of the present embodiment is long. When the focal length is long, even a slight movement causes a large rolling distortion. Therefore, it is necessary to change the threshold value according to the focal length. When the focal length is short, the effect of rolling distortion is small, so the read timing of live view imaging is changed with the threshold values in Table 1. On the other hand, when the focal length is long, the influence of rolling distortion is large, so the read timing of live view imaging is changed with the threshold values in Table 2. When the imaging lens 10 is an interchangeable lens, the threshold may be changed by using an identifier such as a lens ID provided for each lens.

FIG. 4 is a timing chart showing the read timing of still image pickup and the read timing of live view pickup. In the figure, VD is a vertical synchronizing signal, and HD is a horizontal synchronizing signal. An image signal for one frame is read according to VD, and an image signal for one row is read according to HD. The stair-like solid line indicated by Read indicates the read timing of each row, and in the present embodiment, each row is read from the top to the bottom of the screen.

FIG. 4A shows the read timing for still image capturing. In still image capturing, in order to obtain a high-resolution image, all pixels are read from the image sensor 14 without adding or thinning image signals. Therefore, it takes a long time to read one row and one frame.

FIG. 4B shows the readout timing of the live view image pickup in normal times. Since it is only necessary for the image display unit 28 to read out image signals as needed, pixel addition or thinning is performed in live view imaging in order to reduce the number of image signals to be read. As a result, the image size becomes smaller, and the reading speed is shorter than that in still image capturing. Therefore, the read time for one row and the read time for one frame are shorter than the read time for still image capturing. Furthermore, since the power supply to some circuits of the image sensor 14 can be turned off when the reading is completed, the power saving operation period is set.

FIG. 4C shows the read timing when the read speed of the live view image pickup is slowed down in accordance with the still image image pickup. Since the main reading is a live-view imaging, the image size is small, but by extending the reading time for one row more than usual, the entire reading time is equivalent to still image imaging. The read time for one line may be set to a longer period than that for capturing a still image. In the present embodiment, the readout time for one row is lengthened by controlling the HD supply timing, but the present invention is not limited to this, and a method of masking the HD signal in the image sensor 14 may be used. The number of horizontal additions may be increased. Further, the power saving operation may be performed at a timing (horizontal blanking period) when the read operation is not performed when the read time for one row becomes long.

In this way, in live view imaging in which the readout time is equivalent to still image capture, by aligning the readout time for one frame with the still image capture, the modes can be different in image size, but the degree of rolling distortion can be aligned.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIG. Note that the configuration of the image pickup apparatus 100 is the same as that of the first embodiment, so description thereof will be omitted. In the present embodiment, control regarding the shutter method will be described.

FIG. 5 is a diagram showing a timing chart of the shutter method. In the present embodiment, the image pickup apparatus 100 can select and execute a method using a mechanical shutter and a method using an electronic shutter as a shutter method in still image shooting. Here, when the mechanical shutter is used, the difference in the exposure timing is reduced for each row, so that the rolling distortion hardly occurs. On the other hand, when the electronic shutter is used, rolling distortion occurs as described above. However, the degree of rolling distortion is small because the image signals are added or thinned during reading in live view imaging. Therefore, even if the image signals obtained by the still image capturing and the live view capturing by the method using the mechanical shutter are alternately displayed, the display quality is not significantly deteriorated. Also, if the distortion of the subject image is small, the tracking performance will not deteriorate. Therefore, when the method using the mechanical shutter is selected in still image capturing, the tracking process is also performed while alternately displaying still image capturing and live view capturing.

On the other hand, when the method using the electronic shutter is selected for still image capturing, the effect of rolling distortion is large, so when the electronic shutter and live view image capturing are displayed alternately, the display quality is degraded and tracking performance is also increased. Will fall. Therefore, the image signal obtained by the still image capturing using the electronic shutter method may not be used as the display and the tracking image.

By thus controlling the switching of the display operation by the shutter method, it is possible to secure the display quality.

It should be noted that the imaging apparatus 100 according to the present invention changes the readout speed during the period during which the power saving operation in live view imaging is performed. However, when the battery level is low, it is necessary to prioritize the power saving operation over the display quality. If the live view image pickup is changed to the read timing corresponding to the still image image pickup, the power consumption of the image pickup device 14 cannot be reduced, resulting in an increase in power consumption. Therefore, when the battery level is low, the live view imaging should be changed to the read timing equivalent to the still image imaging only when it is the minimum necessary. Specifically, in Table 1 or Table 2, it is desirable to change the live view imaging to the read timing equivalent to the still image imaging only when both the movement of the imaging device 100 and the movement of the subject are the largest.

10 Imaging Lens 12 Shutter 14 Imaging Element 16 A/D Converter 50 System Control Circuit 86 Gyro 100 Imaging Device

Claims (10)

Image pickup means for converting an optical image of the subject into an image signal,
Control means for controlling a first imaging mode for reading the image signal from the imaging means, and a second imaging mode having a slower reading speed than the first imaging mode;
Motion detection means for detecting motion,
A display unit for displaying the first image signal read in the first imaging mode and the second image signal read in the second imaging mode;
When displaying the first image signal and the second image signal read repeatedly using the first image pickup mode and the second image pickup mode on the display unit, the control unit detects the motion. An image pickup apparatus, wherein the read timing of the first image pickup mode is changed according to the detection result of the means. The image pickup apparatus according to claim 1, wherein the movement detection unit detects at least one of the movement of the image pickup apparatus and the movement of the subject. The image pickup apparatus according to claim 1, wherein the control unit changes the read horizontal synchronization period in the first image pickup mode to be long according to the detection result of the motion detection unit. 4. The image pickup apparatus according to claim 1, wherein the detection unit includes a comparison unit that compares a movement with a predetermined threshold value, and performs detection based on a comparison result of the comparison unit. The image pickup apparatus according to claim 1, wherein the detection unit switches the predetermined threshold value according to a focal length of an image pickup lens. The image pickup apparatus according to claim 1, wherein the detection unit switches the predetermined threshold value according to a remaining battery level. The said 1st imaging mode is an imaging mode for still image imaging, and the said 2nd imaging mode is an imaging mode for live view imaging, The any one of Claim 1 thru|or 6 characterized by the above-mentioned. Imaging device. Image pickup means for converting an optical image of the subject into an image signal,
Control means for controlling a first imaging mode for reading the image signal from the imaging means, and a second imaging mode having a slower reading speed than the first imaging mode;
Motion detection means for detecting motion,
A display unit for displaying the first image signal read in the first imaging mode and the second image signal read in the second imaging mode;
When the first image signal and the second image signal repeatedly read out using the first image pickup mode and the second image pickup mode are displayed on the display unit, the control unit sets the first image signal to the first image signal. An image pickup apparatus, wherein display on the display unit in the first image pickup mode is controlled according to a shutter method in the image pickup mode. 9. The image pickup apparatus according to claim 8, wherein the movement detection unit switches whether or not to detect the movement of the subject from the first image signal, according to the shutter system of the first image pickup mode. .. 10. The image pickup apparatus according to claim 8, wherein the shutter method in the first image pickup mode includes a method using a mechanical shutter and a method using an electronic shutter.

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