Control device, imaging device, control method, and control program

Abstract

To provide a control apparatus, an imaging apparatus, a control method, and a control program.SOLUTION: A system control unit 11 derives a first exposure value on the basis of imaged first image data, drives a diaphragm 2 on the basis of the first exposure value, derives a second exposure value on the basis of second image data imaged during of the driving the diaphragm 2 based on the first exposure value, and during the driving of the diaphragm 2 based on the first exposure value, changes the driving of the diaphragm 2 to driving of the diaphragm 2 based on the second exposure value.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a control device, an imaging device, a control method, and a control program. [Background technology]

[0002] Patent document 1 describes an image display control device comprising an imaging element that can be driven at a relatively slow first frame rate and a relatively fast second frame rate, an image signal output means that captures image signals from the imaging element at the first or second frame rate and outputs them to a monitor, and an aperture that adjusts the amount of exposure to the imaging element by changing its opening, wherein when a request signal to change the opening of the aperture is output, the imaging element is changed from being driven at the first frame rate to being driven at the second frame rate, and the image signal output means outputs to the monitor an image signal acquired by the imaging element before the aperture starts moving while the opening of the aperture is being changed.

[0003] Patent Document 2 describes an imaging device comprising: a driving means for driving an aperture mechanism that adjusts the amount of light incident on an imaging element; an imaging means for continuously reading out and outputting frame image signals from the imaging element at predetermined intervals; a luminance detection means for detecting the luminance component of the frame image signal output from the imaging means; a control means for controlling the driving means so that adjustment is made by the aperture mechanism in accordance with a change between the luminance component detected from the frame image signal by the luminance detection means and the luminance component detected by the luminance detection means from the frame image signal immediately before the frame image signal; and a correction means for correcting the luminance component for the frame image signal including the drive period during which the drive means drives the aperture mechanism, using the luminance component detected from the immediately previous frame image signal and the luminance component detected by the luminance detection means from the frame image signal immediately after the drive means starts driving the aperture mechanism, so that the difference between the luminance component and the luminance component detected from the immediately previous frame image is reduced.

[0004] Patent document 3 describes an imaging device comprising an imaging element that captures subject light that has passed through an imaging optical system and generates a pixel signal, an aperture that limits the light beam that has passed through the imaging optical system, an amplifier that amplifies the pixel signal generated by the imaging element at a predetermined amplification factor, and a control means that changes the aperture opening and the amplification factor of the amplifier to adjust the exposure amount of image data based on the pixel signal generated by the imaging element, wherein the control means drives the aperture to change the opening and adjusts the exposure amount, and then changes the amplification factor of the amplifier based on the change in the aperture opening to adjust the exposure amount. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-185907 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-074313 [Patent Document 3] Japanese Patent Application Laid-Open No. 2016-184874 Summary of the Invention [Means for solving the problem]

[0006] A control device according to one embodiment of the technique of the present disclosure is a control device for an imaging device that captures an image of a subject through an aperture, and includes a processor, wherein the processor derives a first exposure value based on captured first image data, drives the aperture based on the first exposure value, derives a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value, and changes the driving of the aperture based on the first exposure value to driving of the aperture based on the second exposure value. the driving of the aperture based on the first exposure value includes acceleration driving for driving the aperture while accelerating, constant speed driving for driving the aperture at a constant speed, and deceleration driving for driving the aperture while decelerating, and the driving of the aperture based on the second exposure value includes only the constant speed driving and the deceleration driving among the acceleration driving, the constant speed driving, and the deceleration driving; It is something.

[0007] An imaging device according to one embodiment of the technique of the present disclosure includes the control device described above.

[0008] A control method according to one embodiment of the technique of the present disclosure is a control method for an imaging device that captures an image of a subject through an aperture, the control method comprising: deriving a first exposure value based on captured first image data; driving the aperture based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; and changing the driving of the aperture based on the first exposure value to driving the aperture based on the second exposure value. the driving of the aperture based on the first exposure value includes acceleration driving for driving the aperture while accelerating, constant speed driving for driving the aperture at a constant speed, and deceleration driving for driving the aperture while decelerating, and the driving of the aperture based on the second exposure value includes only the constant speed driving and the deceleration driving among the acceleration driving, the constant speed driving, and the deceleration driving; It is something.

[0009] A control program according to one embodiment of the technique of the present disclosure is a control program for an imaging device that captures an image of a subject through an aperture, the control program deriving a first exposure value based on captured first image data, driving the aperture based on the first exposure value, deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value, and changing the driving of the aperture based on the first exposure value to driving the aperture based on the second exposure value. the driving of the aperture based on the first exposure value includes acceleration driving for driving the aperture while accelerating, constant speed driving for driving the aperture at a constant speed, and deceleration driving for driving the aperture while decelerating, and the driving of the aperture based on the second exposure value includes only the constant speed driving and the deceleration driving among the acceleration driving, the constant speed driving, and the deceleration driving; The steps are executed by a processor. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a schematic configuration of a digital camera 100 which is an embodiment of an imaging apparatus of the present invention. [Figure 2] 10 is a timing chart for explaining an example of the operation of the digital camera 100 during continuous image capturing. [Figure 3] 10 is a timing chart for explaining an example of the operation of the digital camera 100 during continuous image capturing. [Figure 4] 10 is a flowchart for explaining a preferred operation (part 1) of the system control unit 11 during continuous image capturing. [Figure 5] 10 is a flowchart for explaining a preferred operation (part 2) of the system control unit 11 during continuous image capturing. [Figure 6] 10 is a timing chart for explaining a preferred operation (part 3) of the system control unit 11 during continuous image capturing. [Figure 7] 7 is a timing chart for explaining the operation of the flowchart shown in FIG. 6. [Figure 8] 1 shows the appearance of a smartphone 200. [Figure 9] 9 is a block diagram showing the configuration of the smartphone 200 shown in FIG. 8. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] FIG. 1 is a diagram showing a schematic configuration of a digital camera 100, which is an embodiment of an imaging device of the present invention.

[0012] 1 includes a lens device 40 having an imaging lens 1, an aperture 2, a lens driver 8 that drives the imaging lens 1, and an aperture driver 9 that drives the aperture 2, and a main body 100A. The main body 100A includes an imaging unit 50, a system controller 11, an operation unit 14, a display device 22, a memory 16 including RAM (Random Access Memory) and ROM (Read Only Memory), etc., a memory controller 15 that controls the recording of data to the memory 16 and the reading of data from the memory 16, a digital signal processor 17, and an external memory controller 20 that controls the recording of data to a recording medium 21 and the reading of data from the recording medium 21.

[0013] The lens device 40 may be detachable from the main body 100A, or may be integrated with the main body 100A. The imaging lens 1 includes a focus lens that is movable in the optical axis direction.

[0014] A lens driver 8 of the lens device 40 drives a focus lens included in the imaging lens 1 to change the position of the principal point of the focus lens based on a lens drive signal sent from the system controller 11. An aperture driver 9 of the lens device 40 drives the aperture 2 to change the opening amount (F-number) of the aperture 2 based on a drive control signal sent from the system controller 11. The position of the opening end of the aperture 2 in the radial direction of the aperture of the aperture 2 will be referred to below as the aperture position.

[0015] The imaging unit 50 includes an imaging element 5 that captures an image of a subject through an imaging optical system including an imaging lens 1 and an aperture 2, and an imaging element driving unit 10 that drives the imaging element 5.

[0016] The image sensor 5 has a light receiving surface on which a plurality of pixels are arranged two-dimensionally, and converts a subject image formed on the light receiving surface by an imaging optical system into pixel signals by the plurality of pixels and outputs the pixel signals. The image sensor 5 may be, for example, a CMOS (complementary metal-oxide semiconductor) image sensor, but is not limited to this.

[0017] The system control unit 11, which controls the entire electrical control system of the digital camera 100, drives the image sensor 5 via the image sensor drive unit 10, and outputs the subject image captured through the imaging optical system of the lens device 40 as an image signal.

[0018] The imaging element driver 10 generates a drive signal based on a command from the system controller 11 and supplies the drive signal to the imaging element 5, thereby driving the imaging element 5.

[0019] An instruction signal from the user is input to the system control unit 11 through the operation unit 14. The operation unit 14 includes a touch panel integrated with the display surface 22b, various buttons, and the like.

[0020] The system control unit 11 controls the entire digital camera 100, and its hardware configuration consists of various processors that execute programs, including a control program, to perform processing. The programs executed by the system control unit 11 are stored in the ROM of the memory 16.

[0021] The various types of processors include a CPU (Central Processing Unit), which is a general-purpose processor that executes programs to perform various processes, a programmable logic device (PLD), which is a processor whose circuit configuration can be changed after manufacture, such as an FPGA (Field Programmable Gate Array), or a dedicated electrical circuit, such as an ASIC (Application Specific Integrated Circuit), which is a processor with a circuit configuration designed specifically for performing specific processes. More specifically, the structure of these various processors is an electrical circuit that combines circuit elements such as semiconductor elements.

[0022] The system control unit 11 may be configured with one of various processors, or may be configured with a combination of two or more processors of the same or different types (for example, a combination of multiple FPGAs or a combination of a CPU and an FPGA).

[0023] The display device 22 includes a display surface 22b configured by an organic EL (electroluminescence) panel, a liquid crystal panel, or the like, and a display controller 22a that controls the display on the display surface 22b.

[0024] The memory control unit 15 , digital signal processing unit 17 , external memory control unit 20 , and display controller 22 a are interconnected by a control bus 24 and a data bus 25 , and are controlled by commands from the system control unit 11 .

[0025] Next, the operation of digital camera 100 when continuously capturing images using image sensor 5, such as capturing images for live view image display or capturing images for video recording (continuous capturing at a specific frame rate), will be described. Hereinafter, a period during continuous capturing during which processing is performed to acquire one image data (frame) will be referred to as a frame period. When a frame period starts, an image of a subject is captured by image sensor 5 and image data is generated.

[0026] During continuous image capture, the system controller 11 performs photometry processing based on image data captured by the image sensor 5, and performs exposure calculation based on the results of the photometry processing to derive an appropriate exposure value for the subject being captured. After deriving the appropriate exposure value through exposure calculation, the system controller 11 determines the image capture conditions for obtaining the appropriate exposure value. These image capture conditions include the F-number of the aperture 2, the shutter speed of the image sensor 5 (in other words, the exposure time), and the image capture sensitivity (ISO (International Organization for Standardization) sensitivity) of the image sensor 5.

[0027] Fig. 2 is a timing chart for explaining an example of the operation during continuous imaging of the digital camera 100. Fig. 2 shows an example in which imaging is performed ten times in succession over frame periods F1 to F10.

[0028] 2 indicates the timing at which the system control unit 11 generates a drive control signal for driving the aperture position to a target aperture position (hereinafter referred to as target aperture position) and transmits the drive control signal to the aperture drive unit 9. The drive control signal includes a first drive control signal and a second drive control signal.

[0029] The first drive control signal is composed of aperture drive period information that specifies how many frame periods the drive of the aperture 2 should continue for, information instructing that acceleration drive be performed in the first frame period of the aperture drive period, information instructing that deceleration drive be performed in the last frame period of the aperture drive period, and information instructing that constant speed drive be performed in each frame period between the first and last of the aperture drive period.

[0030] Acceleration driving refers to driving the diaphragm 2 while gradually increasing (accelerating) the drive speed of the diaphragm 2 from zero to a predetermined value. Constant speed driving refers to driving the diaphragm 2 while keeping the drive speed of the diaphragm 2 at a constant value (the above-mentioned predetermined value). Deceleration driving refers to driving the diaphragm 2 while gradually decreasing (decelerating) the drive speed of the diaphragm 2 from the above-mentioned predetermined value to zero.

[0031] The second drive control signal is composed of aperture drive period information that specifies how many frame periods the drive of the aperture 2 should continue for, information instructing that deceleration drive be performed in the last frame period of the aperture drive period, and information instructing that constant speed drive be performed in each frame period except the last frame period of the aperture drive period.

[0032] The system control unit 11 generates a first drive control signal and transmits this first drive control signal to the aperture drive unit 9, thereby performing first drive control that causes the aperture drive unit 9 to drive the aperture 2. The system control unit 11 generates a second drive control signal and transmits the second drive control signal to the aperture drive unit 9, thereby performing second drive control that causes the aperture drive unit 9 to drive the aperture 2.

[0033] "Aperture drive" in FIG. 2 indicates the drive state of the aperture 2 performed by the aperture drive unit 9, and the vertical axis indicates the drive speed of the aperture 2 (speed of change in the opening amount).

[0034] When the system control unit 11 acquires image data obtained by imaging in frame period F1, it performs photometry processing based on the image data and derives an appropriate exposure value EX1 based on the results of the photometry processing (process P1). Next, the system control unit 11 performs exposure setting (setting of shutter speed and imaging sensitivity) to obtain the appropriate exposure value EX1 and setting of a target F-number (setting of target aperture position Fb) to obtain the appropriate exposure value EX1 (process P2). The exposure setting is reflected from the frame period F2 that follows the frame period F1.

[0035] Next, the system control unit 11 generates a first drive control signal SG1 for driving the aperture position to the target aperture position Fb based on the target aperture position Fb set in process P2, and transmits it to the aperture drive unit 9 (process P3). Process P3 is performed in frame period F2, and driving of the aperture 2 based on this first drive control signal SG1 starts from frame period F3.

[0036] In the example of Fig. 2, the first drive control signal SG1 is used to drive the aperture 2 from the current aperture position Fa to the target aperture position Fb over five frame periods. Upon receiving this first drive control signal SG1, the aperture driver 9 starts a first drive D1 (trapezoidal drive waveform in Fig. 2) based on the first drive control signal SG1 from frame period F3. The first drive D1 accelerates the aperture 2 during the first frame period (frame period F3) of the drive period, decelerates the aperture 2 during the last frame period (frame period F7) of the drive period, and drives the aperture 2 at a constant speed during intermediate frame periods (frame periods F4 to F6) of the drive period.

[0037] Next, the system control unit 11 acquires image data obtained by imaging during the frame period (frame period F4 in the example of Figure 2) before the transition to frame period F7 in which deceleration driving begins, out of the period in which the first drive D1 is performed (frame periods F3 to F7), performs photometry processing based on the image data, and derives the appropriate exposure value EX2 based on the result of the photometry processing (process P4).

[0038] Next, the system control unit 11 performs exposure setting (setting of shutter speed and imaging sensitivity) to obtain the appropriate exposure value EX2, and setting a new target F-number (setting of target aperture position Fc) to obtain the appropriate exposure value EX2 (process P5). The exposure setting is reflected from the frame period F5 that follows frame period F4. Note that, here, target aperture position Fc is not between aperture positions Fa and Fb, but is on the opposite side of target aperture position Fb from aperture position Fa. In other words, the drive direction of the aperture 2 when driving it from aperture position Fa to target aperture position Fb is the same as the drive direction of the aperture 2 when driving it from aperture position Fa to target aperture position Fc.

[0039] Next, based on the target aperture position Fc set in process P5, the system control unit 11 generates a second drive control signal SG2 for driving the aperture position to the target aperture position Fc, and transmits it to the aperture drive unit 9 (process P6). Process P6 is performed in frame period F5, and driving of the aperture 2 based on this second drive control signal SG2 starts from frame period F6.

[0040] In the example of Fig. 2, the second drive control signal SG2 is used to drive the aperture 2 to the target aperture position Fc over three frame periods. Upon receiving this second drive control signal SG2, the aperture driver 9 starts second drive D2 (waveform shown by the dashed line in Fig. 2) based on the second drive control signal SG2 from frame period F6. The second drive D2 decelerates the aperture 2 during the last frame period (frame period F8) of the drive period, and drives the aperture 2 at a constant speed during the other frame periods (frame periods F6 and F7).

[0041] In this way, the system control unit 11 changes the drive of the aperture 2 from the first drive D1 to the second drive D2 during the first drive D1 based on the appropriate exposure value EX1. Generally, once the drive of the aperture 2 is stopped, it cannot be immediately restarted due to excitation and other factors. For example, it takes one frame period for the drive of the aperture 2 to stop and then restart. Conventionally, for example, a new appropriate exposure value is derived during frame period F8 after the first drive D1 is completed, and the aperture 2 is driven again during frame period F10 based on that appropriate exposure value. In this conventional technology, the aperture 2 repeatedly starts and stops driving depending on changes in the brightness of the subject, causing changes in the brightness of continuously captured images. In contrast, with the control shown in FIG. 2, even if the brightness of the subject changes during the first drive D1, the drive of the aperture 2 can be continuously driven to a target aperture position corresponding to the changed brightness without stopping the drive of the aperture 2. Therefore, changes in the brightness of continuously captured images can be suppressed, improving the quality of live view images and recorded videos.

[0042] In particular, as shown in FIG. 2, the drive of the aperture 2 is switched to the second drive D2 in frame period F6, during which constant-speed drive of the first drive D1 is scheduled to be performed, thereby enabling seamless and stable switching from the first drive D1 to the second drive D2. For example, when updating the target aperture position based on image data obtained by imaging in frame period F5, it is necessary to switch the drive of the aperture 2 to the second drive D2 in frame period F7, during which deceleration drive of the first drive D1 is started. In contrast to this case, in the example of FIG. 2, there is no change in the drive content during the frame period before and after the change from the first drive D1 to the second drive D2. Therefore, the switch from the first drive D1 to the second drive D2 can be performed seamlessly and stably.

[0043] 2, the appropriate exposure value is derived in frame period F4, but the derived appropriate exposure value may be updated in frame period F3. In this case, the second drive control signal SG2 is generated in frame period F4, and the second drive D2 based on the second drive control signal SG2 is started in frame period F5. Even in this case, switching from the first drive D1 to the second drive D2 can be performed seamlessly and stably.

[0044] In this way, it is preferable that the second drive D2 be started during a frame period in which constant-speed drive is scheduled to be performed in the first drive D1. In this embodiment, one frame period is required from when the target aperture position is set until the drive of the aperture 2 toward the target aperture position is started. Therefore, as illustrated in FIG. 3, if the period in which the first drive D1 is performed is three frame periods, it is preferable not to change to the second drive D2 during the first drive D1 (exposure calculation is not performed).

[0045] In other words, if the time period during which the first drive D1 is performed until the drive shifts to deceleration drive (the length of the period excluding the last frame period) is less than a threshold value (= the time equivalent to three frame periods), it is preferable not to change to the second drive D2 during the first drive D1. Alternatively, if the time period during which the first drive D1 is performed from the time of the shift to constant speed drive until the time of the shift to deceleration drive (the length of the period during which constant speed drive is performed) is less than a threshold value (= the time equivalent to two frame periods), it is preferable not to change to the second drive D2 during the first drive D1.

[0046] Even if the period during which the first drive D1 is performed is four or more frame periods, if the drive direction of the diaphragm 2 by the second drive D2 based on the appropriate exposure value EX2 derived during that period is opposite to the drive direction of the diaphragm 2 by the first drive D1, it is preferable to continue the first drive D1 and complete the first drive D1 without changing to the second drive D2 during the first drive D1. In this way, it is possible to prevent the diaphragm 2 from suddenly reversing or stopping due to the change from the first drive D1 to the second drive D2, and to drive the diaphragm 2 stably.

[0047] FIG. 4 is a flowchart for explaining a preferred operation (part 1) of the system control unit 11 during continuous image capture.

[0048] When continuous imaging starts, the system control unit 11 performs exposure calculations based on image data obtained by imaging, for example, the first frame period, to derive an appropriate exposure value (step S1), and then sets a target aperture position based on the appropriate exposure value (step S2), and sets the exposure (step S3).

[0049] Then, based on the target aperture position set in step S2, the system control unit 11 generates a first drive control signal for driving the aperture position to the target aperture position, and performs drive control to send the first drive control signal to the aperture drive unit 9 (step S4). This drive control starts driving the aperture 2 from the current aperture position to the target aperture position (first drive).

[0050] The system control unit 11 determines whether exposure calculation for updating the target aperture position is possible during this first drive (step S5). Specifically, if the drive period of the aperture 2 determined by the first drive control signal is four frame periods or more, the system control unit 11 determines that exposure calculation for updating the target aperture position is possible. If the drive period of the aperture 2 determined by the first drive control signal is less than four frame periods, the system control unit 11 determines that exposure calculation for updating the target aperture position is not possible.

[0051] If the system control unit 11 determines that exposure calculation for updating the target aperture position is not possible (step S5: NO), it performs the process of step S13. In step S13, the system control unit 11 determines whether the aperture position has reached the target aperture position, and if the aperture position has reached the target aperture position (step S13: YES), it stops driving the aperture 2 (step S14).

[0052] If the system control unit 11 determines that exposure calculation for updating the target aperture position is possible (step S5: YES), it determines whether the exposure calculation frame period (the frame period three frames before the final frame period among the drive periods in which the first drive is performed) has been reached (step S6).

[0053] If the determination in step S6 is YES, the system control unit 11 performs exposure calculation based on the image data obtained by imaging during the exposure calculation frame period to derive a new appropriate exposure value (step S7), and determines a new target aperture position based on the appropriate exposure value (step S8).Then, the system control unit 11 determines whether the drive direction of the aperture 2 from the current aperture position to the new target aperture position is the same as the drive direction of the aperture 2 by the first drive that is currently being executed (step S9).

[0054] If the determination in step S9 is NO, the process proceeds to step S13. If the determination in step S9 is YES, the system control unit 11 updates the currently set target aperture position to the new target aperture position determined in step S8 (step S10). The system control unit 11 also updates the exposure setting based on the new appropriate exposure value derived in step S7 (step S11).

[0055] Then, based on the target aperture position updated in step S10, the system control unit 11 generates a second drive control signal for driving the aperture position to the target aperture position, and performs drive control to send the second drive control signal to the aperture drive unit 9 (step S12). This drive control changes the first drive to the second drive based on the second drive control signal. After step S12, the process proceeds to step S5.

[0056] 4, even when the brightness of the subject changes continuously, the drive of the aperture 2 is changed to the second drive during the first drive, and then changed to another second drive during the second drive. This makes it possible to improve the quality of the captured image even in scenes where the brightness of the subject changes continuously.

[0057] The digital camera 100 may be provided with an operation unit (so-called aperture ring) for manually changing the opening size of the aperture 2. A preferred operation during continuous imaging when this operation unit is included in the digital camera 100 will be described with reference to FIG.

[0058] Fig. 5 is a flowchart for explaining a preferred operation (part 2) of the system control unit 11 during continuous image capture. The flowchart shown in Fig. 5 is the same as Fig. 4 except that steps S15 and S16 have been added. In Fig. 5, the same processes as in Fig. 4 are assigned the same reference numerals as in Fig. 4 and their explanations will be omitted.

[0059] If the determination in step S6 is NO, the system control unit 11 determines whether the aperture ring has been operated (step S15). If the system control unit 11 has not detected the operation of the aperture ring and determines that the aperture ring has not been operated (step S15: NO), the process returns to step S6.

[0060] When the system control unit 11 detects the operation of the aperture ring and determines that the aperture ring is being operated (step S15: YES), it determines whether the operation direction of the aperture ring matches the current drive direction of the aperture 2 by the aperture drive unit 9 (step S16).

[0061] If the operation direction of the aperture ring is the same as the drive direction of the aperture 2 by the aperture drive unit 9 (step S16: YES), the system control unit 11 proceeds to step S7 without waiting for the exposure calculation frame period to arrive. In this step S7, the system control unit 11 performs exposure calculation based on image data obtained by imaging in the most recent frame period (a frame period prior to the exposure calculation frame period). If the operation direction of the aperture ring is opposite the drive direction of the aperture 2 by the aperture drive unit 9 (step S16: NO), the system control unit 11 proceeds to step S13.

[0062] 5, if the user operates to change the aperture position of the aperture 2 in the same direction as the drive direction of the aperture 2 while the aperture drive unit 9 is driving the aperture 2, a new appropriate exposure value is derived immediately without waiting for the exposure calculation frame period to end. This makes it possible to update the target aperture position taking the user's operation into consideration, thereby improving the quality of the captured image.

[0063] Fig. 6 is a timing chart for explaining a preferred operation (part 3) of the system control unit 11 during continuous image capture. In the timing chart shown in Fig. 2, the exposure settings (shutter speed and imaging sensitivity settings) for obtaining the appropriate exposure value EX2 derived in frame period F4 are maintained for the remaining drive periods of the aperture 2 (frame periods F5 to F8). In contrast, in the timing chart shown in Fig. 6, the exposure settings (in other words, the set exposure values) in each frame period from frame period F5 to frame period F8 are gradually changed to a target state, thereby suppressing fluctuations in the brightness of the captured images and improving the quality of the captured images.

[0064] The flowchart shown in Fig. 6 is the same as Fig. 4 except that step S11 between step S10 and step S12 has been deleted and steps S21 to S26 have been added. In Fig. 6, the same processes as in Fig. 4 are given the same reference numerals as in Fig. 4 and their explanations will be omitted. Fig. 7 is a timing chart for explaining the operation of the flowchart shown in Fig. 6.

[0065] After step S12, the system control unit 11 calculates an exposure value change amount ΔEV, which is the amount of change in exposure value per frame period (referred to as exposure value NEW) during the remaining frame period (four frame periods F5 to F8 in the example of FIG. 7) until the drive of the diaphragm 2 is completed, based on the appropriate exposure value calculated in step S7 (referred to as exposure value NEW) and the previous appropriate exposure value (referred to as exposure value OLD) calculated in the exposure calculation immediately before step S7 (step S21). Specifically, the system control unit 11 subtracts the exposure value OLD from the exposure value NEW, divides the result by the number of remaining frame periods, and calculates the exposure value change amount ΔEV. In the example of FIG. 7, the exposure value change amount ΔEV is calculated by dividing {(appropriate exposure value EX2 calculated in frame period F4) - (appropriate exposure value EX1 calculated in frame period F1)} by 4 in step P11.

[0066] After step S21, the system control unit 11 determines whether exposure calculation for updating the target aperture position is possible (step S22). Specifically, if the remaining frame period is four frame periods or more, the system control unit 11 determines that exposure calculation for updating the target aperture position is possible, and if the remaining frame period is less than four frame periods, the system control unit 11 determines that exposure calculation for updating the target aperture position is not possible. In the example of Fig. 7, since the processing of step S22 is performed in frame period F5, there are three remaining frame periods, and it is determined that exposure calculation for updating the target aperture position is not possible.

[0067] If the determination in step S22 is NO, the system control unit 11 updates the exposure settings (shutter speed and imaging sensitivity settings) based on the exposure value change amount ΔEV (step S23).

[0068] Specifically, the system control unit 11 sets the exposure value obtained by adding N times the exposure value change amount ΔEV to the exposure value OLD as the exposure value for the current frame period.Then, assuming that the aperture position is at the target aperture position (i.e., when the F-number is fixed at the target value), the system control unit 11 determines the shutter speed and image sensitivity required to obtain the set exposure value, and sets the shutter speed and image sensitivity for the current frame period based on the determined contents.The above value of N indicates the number of frame periods that have elapsed since the frame period in which the exposure value NEW was derived.

[0069] In the example of FIG. 7, in frame period F5, the exposure value obtained by adding the exposure value change amount ΔEV to the appropriate exposure value EX1 is set, and the exposure setting is updated in process P12 based on this set exposure value and the target aperture position Fc.

[0070] After step S23, the system control unit 11 determines whether the aperture 2 has reached the target aperture position (step S24), and if the aperture has not reached the target position (step S24: NO), the process returns to step S23, and if the aperture has reached the target position (step S24: YES), the process proceeds to step S14.

[0071] In the example of FIG. 7, after process P12, the exposure setting is updated each time a frame period from frame period F6 to frame period F8 starts (processes P13 to P15). In process P13, the exposure value obtained by adding twice the exposure value change amount ΔEV to the correct exposure value EX1 is set as the set exposure value for frame period F6, and exposure setting for imaging in frame period F6 is performed based on this set exposure value. In process P14, the exposure value obtained by adding three times the exposure value change amount ΔEV to the correct exposure value EX1 is set as the set exposure value for frame period F7, and exposure setting for imaging in frame period F7 is performed based on this set exposure value. In process P15, the exposure value obtained by adding four times the exposure value change amount ΔEV to the correct exposure value EX1 is set as the set exposure value for frame period F8, and exposure setting for imaging in frame period F8 is performed based on this set exposure value.

[0072] By updating the exposure setting for each frame period in this way, the shutter speed and imaging sensitivity set in process P15 of FIG. 7 become the same as the values ​​set in process P5 shown in FIG.

[0073] If the determination in step S22 is YES, the system control unit 11 performs the same process as in step S23 (step S25). After step S25, the system control unit 11 determines whether the exposure calculation frame period has been reached (step S26). If the determination in step S26 is NO, the process returns to step S25, and if the determination in step S26 is YES, the process proceeds to step S7.

[0074] 6, the exposure setting (set exposure value) for each frame period of the remaining drive period of the aperture 2 after updating the aperture target position can be gradually changed to the target state. Therefore, compared to the operation in FIG. 2, fluctuations in brightness of the captured image can be suppressed, and the quality of the captured image can be further improved.

[0075] In the operation shown in FIG. 6, in steps S23 and S25, a moving average of the exposure value obtained by adding the exposure value change amount ΔEV to the set exposure value for the immediately preceding frame period and each set exposure value for the past several frame periods is calculated, and this moving average is determined as the appropriate exposure value, and exposure setting may be performed based on this appropriate exposure value and the target aperture position.

[0076] In the example of FIG. 7, for example, in process P12, the moving average value of (appropriate exposure value EX1+exposure value change amount ΔEV) and the set exposure values ​​(=appropriate exposure value EX1) for each of the frame periods F1 to F4 is set as the set exposure value for frame period F5, and the exposure setting for imaging in frame period F5 is updated based on this set exposure value.

[0077] Furthermore, in process P13, the moving average value of (the set exposure value for frame period F5 + the exposure value change amount ΔEV) and the set exposure values ​​for each of frame periods F2 to F5 is set as the set exposure value for frame period F6, and the exposure setting for imaging in frame period F6 is updated based on this set exposure value.

[0078] Furthermore, in process P14, the moving average value of (the set exposure value for frame period F6 + the exposure value change amount ΔEV) and the set exposure values ​​for each of frame periods F3 to F6 is set as the set exposure value for frame period F7, and the exposure setting for imaging in frame period F7 is updated based on this set exposure value.

[0079] Furthermore, in process P15, the moving average value of (the set exposure value for frame period F7 + the exposure value change amount ΔEV) and the set exposure values ​​for each of frame periods F4 to F7 is set as the set exposure value for frame period F8, and the exposure setting for imaging in frame period F8 is updated based on this set exposure value.

[0080] By doing so, it becomes possible to update the exposure setting in accordance with fluctuations in brightness of the captured image, and the quality of the captured image can be further improved.

[0081] Next, the configuration of a smartphone, which is another embodiment of the imaging device of the present invention, will be described.

[0082] Fig. 8 shows the external appearance of smartphone 200. Smartphone 200 shown in Fig. 8 has a flat housing 201, and is provided on one surface of housing 201 with display panel 202 as a display unit and display input unit 204 which is an integrated unit of operation panel 203 as an input unit.

[0083] Such housing 201 also includes a speaker 205, a microphone 206, an operation unit 207, and a camera unit 208. The configuration of housing 201 is not limited to this, and for example, it is also possible to adopt a configuration in which the display unit and the input unit are independent, or a configuration having a foldable structure or a sliding mechanism.

[0084] FIG. 9 is a block diagram showing the configuration of the smartphone 200 shown in FIG.

[0085] As shown in FIG. 9, the main components of the smartphone include a wireless communication unit 210, a display input unit 204, a call unit 211, an operation unit 207, a camera unit 208, a memory unit 212, an external input / output unit 213, a GNSS (Global Navigation Satellite System) receiving unit 214, a motion sensor unit 215, a power supply unit 216, and a main control unit 220.

[0086] The smartphone 200 also has, as its main function, a wireless communication function for performing mobile wireless communication via a base station device BS (not shown) and a mobile communication network NW (not shown).

[0087] The wireless communication unit 210 performs wireless communication with a base station device BS accommodated in the mobile communication network NW in accordance with instructions from the main control unit 220. Using this wireless communication, various file data such as audio data and image data, e-mail data, etc. are sent and received, and web data, streaming data, etc. are received.

[0088] The display input unit 204 is a so-called touch panel that displays images (still images and moving images) or text information, etc. under the control of the main control unit 220 to visually convey information to the user and detects user operations on the displayed information, and is equipped with a display panel 202 and an operation panel 203.

[0089] The display panel 202 uses an LCD (Liquid Crystal Display), an OLED (Organic Electro-Luminescence Display), or the like as a display device.

[0090] The operation panel 203 is placed so that an image displayed on the display surface of the display panel 202 can be seen, and is a device that detects one or more coordinates operated by a user's finger or a stylus. When this device is operated by the user's finger or a stylus, a detection signal generated by the operation is output to the main control unit 220. Next, the main control unit 220 detects the operation position (coordinates) on the display panel 202 based on the received detection signal.

[0091] As shown in FIG. 9, the display panel 202 and operation panel 203 of a smartphone 200, which is exemplified as one embodiment of the imaging device of the present invention, are integrated to form a display input unit 204, and the operation panel 203 is positioned so as to completely cover the display panel 202.

[0092] When such an arrangement is adopted, operation panel 203 may also have a function to detect user operations in areas outside display panel 202. In other words, operation panel 203 may have a detection area for the overlapping portion that overlaps display panel 202 (hereinafter referred to as a display area), and a detection area for the other outer edge portion that does not overlap display panel 202 (hereinafter referred to as a non-display area).

[0093] The size of the display area and the size of the display panel 202 may be completely the same, but they do not necessarily have to be the same. Also, the operation panel 203 may have two sensitive areas: an outer edge portion and an inner portion other than the outer edge portion. Furthermore, the width of the outer edge portion is designed appropriately depending on the size of the housing 201, etc.

[0094] Furthermore, the position detection method used in the operation panel 203 may be a matrix switch method, a resistive film method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, a capacitance method, or the like, and any method may be used.

[0095] The call unit 211 is equipped with a speaker 205 or a microphone 206, and converts the user's voice input through the microphone 206 into voice data that can be processed by the main control unit 220 and outputs it to the main control unit 220, or decodes voice data received by the wireless communication unit 210 or the external input / output unit 213 and outputs it from the speaker 205.

[0096] Also, as shown in FIG. 8, for example, speaker 205 can be mounted on the same surface as display input unit 204, and microphone 206 can be mounted on the side surface of housing 201.

[0097] The operation unit 207 is a hardware key using a key switch or the like, and receives instructions from a user. For example, as shown in Fig. 8, the operation unit 207 is a push-button switch mounted on the side of the housing 201 of the smartphone 200, which turns on when pressed with a finger or the like, and turns off when the finger is released by the restoring force of a spring or the like.

[0098] The storage unit 212 stores the control program and control data of the main control unit 220, application software, address data associated with names or telephone numbers of communication partners, data of sent and received e-mails, web data downloaded by web browsing, downloaded content data, and also temporarily stores streaming data, etc. The storage unit 212 is composed of an internal storage unit 217 built into the smartphone and an external storage unit 218 having a removable external memory slot.

[0099] The internal memory unit 217 and the external memory unit 218 constituting the memory unit 212 are realized using storage media such as a flash memory type, a hard disk type, a multimedia card micro type, a card-type memory (e.g., MicroSD (registered trademark) memory, etc.), a RAM (Random Access Memory), a ROM (Read Only Memory), etc.

[0100] The external input / output unit 213 serves as an interface with all external devices connected to the smartphone 200, and is used to directly or indirectly connect to other external devices via communication (e.g., Universal Serial Bus (USB), IEEE1394, Bluetooth (registered trademark), RFID (Radio Frequency Identification), Infrared Data Association (IrDA) (registered trademark), UWB (Ultra Wideband) (registered trademark), ZigBee (registered trademark), etc.) or a network (e.g., Ethernet (registered trademark), wireless LAN (Local Area Network), etc.).

[0101] Examples of external devices that can be connected to the smartphone 200 include wired / wireless headsets, wired / wireless external chargers, wired / wireless data ports, memory cards connected via card sockets, SIM (Subscriber Identity Module Card) / UIM (User Identity Module Card) cards, external audio / video devices connected via audio / video I / O (Input / Output) terminals, wirelessly connected external audio / video devices, wired / wirelessly connected smartphones, wired / wirelessly connected personal computers, wired / wirelessly connected personal computers, earphones, etc.

[0102] The external input / output unit 213 can transmit data received from such external devices to each component inside the smartphone 200, or transmit data inside the smartphone 200 to external devices.

[0103] The GNSS receiver 214 receives GNSS signals transmitted from GNSS satellites ST1 to STn in accordance with instructions from the main controller 220, executes positioning calculation processing based on the received multiple GNSS signals, and detects a position consisting of the latitude, longitude, and altitude of the smartphone 200. When the GNSS receiver 214 can acquire position information from the wireless communication unit 210 or the external input / output unit 213 (for example, a wireless LAN), it can also detect the position using the position information.

[0104] The motion sensor unit 215 includes, for example, a three-axis acceleration sensor, and detects the physical movement of the smartphone 200 in accordance with instructions from the main control unit 220. By detecting the physical movement of the smartphone 200, the direction of movement or acceleration of the smartphone 200 is detected. The detection result is output to the main control unit 220.

[0105] The power supply unit 216 supplies power stored in a battery (not shown) to each unit of the smartphone 200 in accordance with instructions from the main control unit 220.

[0106] The main control unit 220 includes a microprocessor, operates according to the control program and control data stored in the storage unit 212, and controls all the units of the smartphone 200. The microprocessor of the main control unit 220 has the same functions as the system control unit 11. The main control unit 220 also has a mobile communication control function that controls all the units of the communication system to perform voice communication or data communication via the wireless communication unit 210, and an application processing function.

[0107] The application processing function is realized by the main control unit 220 operating in accordance with the application software stored in the storage unit 212. Examples of the application processing function include an infrared communication function that controls the external input / output unit 213 to perform data communication with a partner device, an email function that sends and receives emails, and a web browsing function that views web pages.

[0108] The main control unit 220 also has an image processing function for displaying video on the display input unit 204 based on image data (still image or moving image data) such as received data or downloaded streaming data.

[0109] The image processing function refers to a function in which the main control unit 220 decodes the image data, performs image processing on the decoded result, and displays the image on the display input unit 204.

[0110] Furthermore, the main control unit 220 executes display control for the display panel 202 and operation detection control for detecting user operations via the operation unit 207 and the operation panel 203 .

[0111] By executing display control, the main control unit 220 displays software keys such as icons or scroll bars for starting application software, or displays a window for creating an e-mail.

[0112] The scroll bar refers to a software key for receiving an instruction to move the displayed portion of an image, such as a large image that cannot fit in the display area of ​​the display panel 202.

[0113] In addition, by executing operation detection control, the main control unit 220 detects user operations through the operation unit 207, accepts operations on the above icons and input of character strings into the input field of the above window through the operation panel 203, or accepts requests to scroll the displayed image through the scroll bar.

[0114] Furthermore, by executing operation detection control, the main control unit 220 determines whether the operation position on the operation panel 203 is an overlapping portion (display area) that overlaps the display panel 202 or an outer edge portion (non-display area) that does not overlap the display panel 202, and is equipped with a touch panel control function that controls the sensitive area of ​​the operation panel 203 or the display position of the software key.

[0115] Furthermore, the main control unit 220 can also detect a gesture operation on the operation panel 203 and execute a preset function in response to the detected gesture operation.

[0116] Gesture operation is not a simple touch operation as in the past, but rather an operation in which a trajectory is drawn with a finger or the like, multiple positions are designated simultaneously, or a combination of these is used to draw a trajectory for at least one of multiple positions.

[0117] The camera unit 208 includes the lens device 40 and the imaging unit 50 shown in FIG.

[0118] The captured image data generated by the camera unit 208 can be stored in the storage unit 212 or output via the external input / output unit 213 or the wireless communication unit 210 .

[0119] In the smartphone 200 shown in FIG. 9, the camera unit 208 is mounted on the same surface as the display input unit 204, but the mounting position of the camera unit 208 is not limited to this, and it may be mounted on the back surface of the display input unit 204.

[0120] Furthermore, the camera unit 208 can be used for various functions of the smartphone 200. For example, an image acquired by the camera unit 208 can be displayed on the display panel 202, or an image from the camera unit 208 can be used as one of the operation inputs for the operation panel 203.

[0121] Furthermore, when the GNSS receiver 214 detects a position, it can also detect the position by referring to an image from the camera unit 208. Furthermore, it can also refer to an image from the camera unit 208 to determine the optical axis direction of the camera unit 208 of the smartphone 200 or determine the current usage environment, without using a triaxial acceleration sensor or by using the image in combination with a triaxial acceleration sensor. Of course, the image from the camera unit 208 can also be used in application software.

[0122] In addition, image data of still or video images can be added with location information acquired by the GNSS receiving unit 214, audio information acquired by the microphone 206 (which may be converted to text information by the main control unit, etc.), posture information acquired by the motion sensor unit 215, etc., and stored in the memory unit 212, or output via the external input / output unit 213 or wireless communication unit 210.

[0123] In the above explanation, the system control unit 11 drives the diaphragm 2 via the diaphragm drive unit 9. However, the system control unit 11 may also be configured to directly drive the diaphragm 2 based on a drive control signal, without going through the diaphragm drive unit 9. In this specification, the drive control performed by the system control unit 11 (driving the diaphragm 2 based on the appropriate exposure value) is defined to include both having the diaphragm drive unit 9 drive the diaphragm 2 and directly driving the diaphragm 2.

[0124] As explained above, this specification describes at least the following items. Note that the elements in parentheses correspond to those in the above-described embodiments, but are not limited to these.

[0125] (1) A control device for an imaging device that captures an image of a subject through an aperture, A processor (system control unit 11) is provided, The processor is Deriving a first exposure value (appropriate exposure value EX1) based on the captured first image data (image data obtained by capturing an image during the frame period F1); driving the diaphragm (first driving D1) based on the first exposure value; Deriving a second exposure value (appropriate exposure value EX2) based on second image data (image data obtained by capturing an image during frame period F4) captured while the diaphragm is driven based on the first exposure value; During the driving of the diaphragm based on the first exposure value, the driving of the diaphragm is changed to the driving of the diaphragm based on the second exposure value (second driving D2). Control device.

[0126] (2) The control device according to (1), driving the diaphragm based on the first exposure value includes constant speed driving of driving the diaphragm at a constant speed; the processor changes the driving of the diaphragm during the constant speed driving to driving of the diaphragm based on the second exposure value; Control device.

[0127] (3) The control device according to (1) or (2), driving the diaphragm based on the first exposure value includes deceleration driving of driving the diaphragm while decelerating; the processor changes the driving of the diaphragm to driving of the diaphragm based on the second exposure value before transitioning to the deceleration driving; Control device.

[0128] (4) The control device according to any one of (1) to (3), driving the diaphragm based on the first exposure value includes acceleration driving for driving the diaphragm while accelerating, constant speed driving for driving the diaphragm at a constant speed, and deceleration driving for driving the diaphragm while decelerating, the driving of the diaphragm based on the second exposure value includes only the constant speed drive and the deceleration drive among the acceleration drive, the constant speed drive, and the deceleration drive; Control device.

[0129] (5) The control device according to any one of (1) to (4), the processor does not change the diaphragm drive direction based on the second exposure value when the diaphragm drive direction based on the first exposure value is opposite to the diaphragm drive direction based on the second exposure value; Control device.

[0130] (6) The control device according to any one of (1) to (5), driving the diaphragm based on the first exposure value includes constant speed driving for driving the diaphragm at a constant speed and deceleration driving for driving the diaphragm while decelerating; the processor does not change to driving of the diaphragm based on the second exposure value when a time until the deceleration drive is started or a time from the constant speed drive to the deceleration drive is less than a threshold during the period of driving of the diaphragm based on the first exposure value; Control device.

[0131] (7) A control device according to any one of (1) to (6), the first image data and the second image data are portions of frames captured at a specific frame rate; the processor calculates an exposure value change amount per unit frame (exposure value change amount ΔEV) based on the difference between the first exposure value and the second exposure value, and sets an exposure value for a frame captured after the second image data based on the number of frames from the frame of the second image data and the exposure value change amount. Control device.

[0132] (8) (7) The control device according to the present invention, the processor sets a fourth exposure value calculated by taking a moving average of a third exposure value, which is the exposure value to be set in a frame captured after the second image data, and an exposure value set in a previous frame prior to the frame, as the exposure value of the frame; Control device.

[0133] (9) A control device according to any one of (1) to (8), When the processor detects, during driving of the diaphragm based on the first exposure value and before acquiring the second image data, an operation for changing the position of the diaphragm in the same direction as the diaphragm drive direction in driving the diaphragm based on the first exposure value, the processor derives the second exposure value based on image data acquired before acquiring the second image data. Control device.

[0134] (10) The control device according to any one of (1) to (9), when the processor detects, during driving of the diaphragm based on the first exposure value and before acquiring the second image data, an operation for changing the position of the diaphragm in a direction opposite to the diaphragm drive direction in driving the diaphragm based on the first exposure value, the processor stops deriving the second exposure value, continues driving the diaphragm based on the first exposure value, and completes the driving; Control device.

[0135] (11) An imaging device comprising the control device according to any one of (1) to (10).

[0136] (12) A control method for an imaging device that captures an image of a subject through an aperture, comprising: deriving a first exposure value based on the captured first image data; driving the diaphragm based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value during the driving of the diaphragm based on the first exposure value; Control method.

[0137] (13) A control program for an imaging device that captures an image of a subject through an aperture, deriving a first exposure value based on the captured first image data; driving the diaphragm based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value during the driving of the diaphragm based on the first exposure value; A control program that causes a processor to execute steps. [Explanation of symbols]

[0138] 1 Imaging lens 2 apertures 5. Image sensor 8 Lens drive unit 9 Aperture drive unit 10. Image sensor driver 11 System control section 14 Control section 15 Memory control unit 16 memory 17 Digital Signal Processing Unit 20 External memory control unit 21 Recording media 22a Display Controller 22b Display surface 22 Display device 24 control bus 25 Data Bus 40 Lens device 50 Imaging unit 100A main body 100 digital cameras P1~P6 processing P11~P15 processing D1 First drive D2 Second drive Fa Aperture position Fb, Fc target aperture position 200 smartphones 201 Case 202 Display Panel 203 Operation Panel 204 Display and input section 205 Speaker 206 Microphone 208 Camera Club 210 Radio Communication Department 211 Telephone section 212 Storage section 213 External input / output section 214 GNSS receiver 215 Motion sensor unit 216 Power supply section 217 Internal storage 218 External Memory Unit 220 Main control unit

Claims

1. A control device for an imaging device that captures an image of a subject through an aperture, a processor; The processor: Deriving a first exposure value based on the captured first image data; driving the aperture based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value while the diaphragm is being driven based on the first exposure value; driving the diaphragm based on the first exposure value includes acceleration driving for driving the diaphragm while accelerating, constant speed driving for driving the diaphragm at a constant speed, and deceleration driving for driving the diaphragm while decelerating, the driving of the diaphragm based on the second exposure value includes only the constant speed drive and the deceleration drive among the acceleration drive, the constant speed drive, and the deceleration drive; Control device.

2. A control device for an imaging device that captures an image of a subject through an aperture, a processor; The processor: Deriving a first exposure value based on the captured first image data; driving the aperture based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value while the diaphragm is being driven based on the first exposure value; When the diaphragm drive direction in driving the diaphragm based on the first exposure value and the diaphragm drive direction in driving the diaphragm based on the second exposure value are opposite, the diaphragm drive direction is not changed to the diaphragm drive based on the second exposure value. Control device.

3. A control device for an imaging device that captures an image of a subject through an aperture, a processor; The processor: Deriving a first exposure value based on the captured first image data; driving the aperture based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value while the diaphragm is being driven based on the first exposure value; driving the diaphragm based on the first exposure value includes constant speed driving for driving the diaphragm at a constant speed and deceleration driving for driving the diaphragm while decelerating, the processor does not change the driving of the diaphragm to that based on the second exposure value when a time until the driving of the diaphragm is shifted to the deceleration driving or a time from the shift to the constant speed driving to the deceleration driving is less than a threshold during the driving of the diaphragm based on the first exposure value; Control device.

4. A control device for an imaging device that captures an image of a subject through an aperture, a processor; The processor: Deriving a first exposure value based on the captured first image data; driving the diaphragm based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value while the diaphragm is being driven based on the first exposure value; the first image data and the second image data are portions of frames captured at a specific frame rate; the processor calculates an exposure value change amount per unit frame based on a difference between the first exposure value and the second exposure value, and sets an exposure value for a frame captured after the second image data based on the number of frames from the frame of the second image data and the exposure value change amount. Control device.

5. A control device according to claim 4, the processor sets a fourth exposure value calculated by taking a moving average of a third exposure value, which is the exposure value to be set in a frame captured after the second image data, and an exposure value set in a previous frame prior to the frame, as the exposure value of the frame; Control device.

6. A control device for an imaging device that captures an image of a subject through an aperture, a processor; The processor: Deriving a first exposure value based on the captured first image data; driving the aperture based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value while the diaphragm is being driven based on the first exposure value; when an operation for changing the position of the diaphragm in the same direction as the diaphragm drive direction in driving the diaphragm based on the first exposure value is detected before the acquisition of the second image data, the second exposure value is derived based on image data acquired before the second image data. Control device.

7. A control device for an imaging device that captures an image of a subject through an aperture, a processor; The processor: Deriving a first exposure value based on the captured first image data; driving the aperture based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value while the diaphragm is being driven based on the first exposure value; when an operation for changing the position of the diaphragm in a direction opposite to the diaphragm drive direction in driving the diaphragm based on the first exposure value is detected during driving of the diaphragm based on the first exposure value and before the second image data is acquired, derivation of the second exposure value is stopped, and driving of the diaphragm based on the first exposure value is continued and the driving is completed. Control device.

8. A control device according to any one of claims 1 to 7, driving the diaphragm based on the first exposure value includes constant speed driving of driving the diaphragm at a constant speed; the processor changes the driving of the diaphragm during the constant speed driving to driving of the diaphragm based on the second exposure value; Control device.

9. A control device according to any one of claims 1 to 8, driving the diaphragm based on the first exposure value includes deceleration driving of driving the diaphragm while decelerating, the processor changes the driving of the diaphragm to driving of the diaphragm based on the second exposure value before transitioning to the deceleration driving; Control device.

10. An imaging device equipped with a control device described in any one of claims 1 to 9.

11. A control method for an imaging device that captures an image of a subject through an aperture, comprising: Deriving a first exposure value based on the captured first image data; driving the aperture based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value while the diaphragm is being driven based on the first exposure value; driving the diaphragm based on the first exposure value includes acceleration driving for driving the diaphragm while accelerating, constant speed driving for driving the diaphragm at a constant speed, and deceleration driving for driving the diaphragm while decelerating, the driving of the diaphragm based on the second exposure value includes only the constant speed drive and the deceleration drive among the acceleration drive, the constant speed drive, and the deceleration drive; Control method.

12. A control program for an imaging device that captures an image of a subject through an aperture, Deriving a first exposure value based on the captured first image data; driving the aperture based on the first exposure value; deriving a second exposure value based on second image data captured while the aperture is being driven based on the first exposure value; changing the driving of the diaphragm based on the second exposure value while the diaphragm is being driven based on the first exposure value; driving the diaphragm based on the first exposure value includes acceleration driving for driving the diaphragm while accelerating, constant speed driving for driving the diaphragm at a constant speed, and deceleration driving for driving the diaphragm while decelerating, the driving of the diaphragm based on the second exposure value includes only the constant speed drive and the deceleration drive among the acceleration drive, the constant speed drive, and the deceleration drive; A control program that causes a processor to execute steps.

Images