Electronic apparatus, control method, and program

Abstract

To improve the convenience of a user by displaying a correct iris value at the reproduction of a dynamic image.SOLUTION: An electric apparatus includes: display means capable of reproducing and displaying a dynamic image data obtained by an imaging device that can change an iris value; means for acquiring information on an F value held in the dynamic data; and calculation means for calculating information on a corresponding T value from the information on the F value. The display means is characterized in that the information on the T value is displayed at the time of reproduction of the dynamic image data.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to a method for displaying an aperture value in an electronic device. [Background technology]

[0002] Conventionally, a method is known for adjusting the exposure when capturing an image of a subject by controlling the aperture diameter of a diaphragm, which is a light amount adjusting member in an imaging device. Aperture values ​​related to the state of the diaphragm (or the amount of light adjusted by the diaphragm) include an F value, which assumes that the transmittance of an optical system such as a lens is 100%, and a T value, which takes the transmittance of the optical system into consideration.

[0003] Here, there are known optical filters for improving the blurred image, and technologies relating to lenses and cameras incorporating such filters. One example of such filters is the apodization filter (hereinafter referred to as the APD filter).

[0004] The APD filter is designed so that the transmittance decreases with distance from the center of the optical axis in the direction perpendicular to the optical axis, and using this filter makes the contours of the blurred image smoother and reduces double-line blur and ring blur. In particular, in scenes where a shallow depth of field is desirable, such as portrait photography or macro photography, using this APD filter makes it possible to obtain a high-quality image in which the contour blur of the background image is soft and the main subject stands out.

[0005] As described above, in a lens equipped with an APD filter, the transmittance of the optical system varies in the direction perpendicular to the optical axis, so that, for example, the optical system arranged on the optical path has a first region in which the change in the amount of light relative to the change in the aperture is gradual and a second region in which the change is more rapid than the first region. In other words, the light flux incident on the imaging device side via the APD filter has a different amount of transmitted light for each region in the direction perpendicular to the optical axis of the lens, so that the linearity of the light amount change ratio relative to the change in the aperture diameter of the aperture is lost.

[0006] Regarding this deviation in the light amount change ratio, Patent Document 1 discloses a technique for separately performing autofocus control and exposure control in response to the deviation in the light amount change ratio relative to the aperture change. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] WO16 / 035643 Summary of the Invention [Problem to be solved by the invention]

[0008] However, Patent Document 1 does not mention a method of displaying the aperture value when playing back a moving image captured using a lens that handles the aperture value as information on the T value. For example, when acquiring a moving image in MP4 file format as video content, information on the T value cannot be recorded as metadata to be loaded onto the moving image. Therefore, even if a moving image is acquired using a lens that can handle information on the T value as an aperture value, depending on the type of moving image, the user may not be able to correctly grasp the T value at the time of shooting when playing back the moving image, which may reduce user convenience.

[0009] An object of the present invention is to improve user convenience by displaying a correct aperture value when reproducing an image. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the electronic device of the present invention has a display means capable of playing and displaying moving image data obtained by an imaging device capable of changing the aperture value, a means for acquiring information regarding an F-number stored in the moving image data, and a calculation means for calculating information regarding a corresponding T-number from the information regarding the F-number, wherein the display means displays the information regarding the T-number when playing back the moving image data. Effect of the Invention

[0011] According to the present invention, by displaying the correct aperture value during playback of a moving image, it is possible to improve user convenience. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a block diagram illustrating the configurations of a camera 100 and a lens unit 200 that are an embodiment of an imaging device embodying the present invention. [Diagram 2] FIG. 2 is a diagram illustrating an example of the transmittance of the APD filter 202 according to the present invention. [Diagram 3] 1 is a diagram for explaining an example of the correspondence between the F value and the T value in the lens unit 200 according to the present invention. FIG. [Figure 4] FIG. 4 is a flowchart illustrating an attached lens detection process according to the first embodiment of the present invention. [Diagram 5] FIG. 4 is a diagram showing an example of a T value / F value conversion table according to the present invention. [Figure 6] 11 is a flowchart of a display process of the T-value and the F-value when a T-value compatible lens unit is attached to the camera 100 according to the present invention. [Figure 7] 11 is a flowchart of a display process of the T-value and the F-value when a T-value compatible lens unit is attached to the camera 100 according to the present invention. [Figure 8] 11A to 11C are diagrams illustrating an example of a user interface display using a display unit 153 according to the present invention. [Figure 9] 10 is a flowchart showing T value / F value display determination processing according to the second embodiment of the present invention. [Figure 10] 13 is a flowchart showing aperture value display processing during image playback according to the third embodiment of the present invention. [Figure 11] 11A to 11C are diagrams illustrating an example of a display on a display unit according to an aperture value display process when image data is reproduced according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] (First embodiment) (Basic configuration of imaging device) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram for explaining the configuration of a camera 100 and a lens unit 200, which are an embodiment of an imaging device embodying the present invention. One or more of the functional blocks shown in FIG. 1 may be realized by hardware such as an ASIC or a programmable logic array (PLA). They may also be realized by a programmable processor (microprocessor, microcomputer) such as a CPU or MPU executing software. They may also be realized by a combination of software and hardware. Therefore, even if different functional blocks are described as operating subjects in the following description, they may be realized by the same hardware as the subject.

[0014] 1, camera 100 is an imaging device to which lens unit 200 can be detachably attached. Note that camera 100 may be configured to employ an imaging device in which lens unit 200 is an integral structure.

[0015] The lens unit 200 is a camera accessory that can be attached to and detached from the camera 100, and includes a lens 201 (image pickup optical system) that is made up of multiple optical systems. The lens 201 is made up of multiple lenses, such as a focus lens, a zoom lens, and a shift lens.

[0016] The apodization filter (hereinafter referred to as APD filter) 202 is an optical filter disposed in the optical path between the lens 201 and the image sensor 110 of the camera 100. The optical density or light transmittance is generally used as an index representing the optical characteristics of the APD filter 202.

[0017] 2 is a diagram illustrating an example of the transmittance of the APD filter 202 according to the present invention. The APD filter 202 has a light transmittance (in other words, a filter density) that differs stepwise in a radial direction of the APD filter 202 that is perpendicular to the optical axis, with respect to an axis (optical axis) located at the center of the APD filter 202 as a reference. Specifically, the APD filter 202 has a gradually lower light transmittance (light transmittance) and a higher filter density toward the outside in the radial direction of the filter with respect to the optical axis. Therefore, the amount of light transmitted by the light flux incident through the APD filter 202 differs in the radial direction with respect to the optical axis.

[0018] Based on the light transmittance Tr of the APD filter 202 and the aperture value (F-number) related to the aperture diameter of the aperture 203 described later, the T value indicating the total light amount of the lens unit 200 based on the aperture diameter of the aperture 203 and the transmittance of the lens unit 200 is expressed by the following equation (1). T=F / Tr 1 / 2 (1)

[0019] The light transmittance Tr in the formula (1) is the average value in the entire area within the aperture (light beam passing aperture) formed by the diaphragm 203 .

[0020] Fig. 3 is a diagram for explaining an example of the correspondence between the F-number and the T-number in the lens unit 200 according to the present invention, where the horizontal axis indicates the F-number (number of steps) that depends on the aperture diameter of the diaphragm 203, and the vertical axis indicates the T-number (number of steps). Note that in Fig. 3, when the F-number and the T-number are the same, such as in a lens unit that does not include the APD filter 202, the change in the T-number relative to the F-number is linear, as shown by the dashed line in Fig. 3.

[0021] Here, in this embodiment, the change in brightness corresponding to one step of the amount of light is, for example, a change in brightness corresponding to 1Bv in an APEX (ADDITIVE SYSTEM OF PHOTOGRAPHIC EXPOSURE) system. In general, when the aperture diameter (effective diameter) of the diaphragm changes by 1 / √2 times, the F-number changes by one step, and the amount of light (Bv value) also changes by one step. However, as in the APD filter 202 of this embodiment, when the density near the open aperture of the diaphragm 204 is denser (light transmittance is lower) than other areas, a difference occurs between the F-number and the T-number near the open aperture of the diaphragm 203. This is because, in the area of ​​the APD filter 202 near the open aperture of the diaphragm 203, even in the area where the F-number changes by one step, the amount of light passing through the APD filter 202 is less than 1Bv. Note that the change in brightness corresponding to one step of the F-number is synonymous with the change in brightness corresponding to 1Bv in a lens unit that does not include the APD filter 202.

[0022] 3, the correspondence relationship between the T value and the F value in the lens unit 200 shown by the solid line is such that the more the aperture 203 is narrowed, the smaller the difference between the T value and the F value becomes, and when the F value exceeds a predetermined value (8 steps (8Bv) in FIG. 3), the T value and the F value become approximately equal. In contrast, the larger the aperture diameter of the aperture 203 becomes (the more open the aperture is), the larger the difference between the T value and the F value becomes, and for example, the light reduction effect of the APD filter 202 becomes maximum when the aperture 203 is near the open aperture. Specifically, in the lens unit 200 of this embodiment, the amount of light passing through the APD filter 202 is reduced by approximately two steps when the aperture 203 is near the open aperture, compared to a lens unit not provided with the APD filter 202.

[0023] Returning to FIG. 1, the lens unit 200 has a lens control unit 204 that controls each unit constituting the lens unit 200. For example, the lens control unit 204 can control the driving of the aperture 203 via an aperture driving unit 205. The lens control unit 204 can also control the driving of the lens 201 via a lens driving unit 206. The lens control unit 204 is connected to the CPU 131 of the camera 100 via a terminal group described later, and can control the lens unit 200 in response to a control instruction from the CPU 131.

[0024] The lens mount 207 is a physical connection mechanism between the lens unit 200 and the camera 100, and at the same time, is capable of controlling the camera mount 102 provided on the camera 100, and is provided with a group of terminals for communicating with the camera 100. When the lens unit 200 is attached to the camera 100 via the lens mount 207, the lens unit 200 and the camera 100 are able to communicate with each other.

[0025] Next, each component of the camera 100 will be described with reference to Fig. 1. The image sensor 110 is an imaging means that employs a charge-accumulation type solid-state image sensor such as a CMOS or a CCD, which can receive a light beam from a subject guided into the camera 100 via the lens unit 200 and convert it into an electrical image signal. Since the electrical signal obtained by the image sensor 110 is an analog value, the image sensor 110 also has a function of converting it into a digital value. Based on the image signal output from the image sensor 110, an evaluation value (photometric value) regarding the brightness of the subject can be detected.

[0026] The shutter 103 is a light blocking member disposed on the optical path between the lens unit 200 and the image sensor 110 when the lens unit 200 is attached to the camera 100, and the amount of light incident on the image sensor 110 can be adjusted by controlling the state of the shutter 103. Note that, in this embodiment, a configuration in which the shutter 103 is used to adjust the exposure time of the image sensor 110 will be described, but the present invention is not limited to this. The image sensor 110 may have a so-called electronic shutter function, and the exposure time may be adjusted by adjusting the reset, readout, and accumulation timing of the image sensor 110, without operating the shutter 103.

[0027] The video signal processor 121 is a signal processing means that performs various image processing and analysis such as white balance, color interpolation, color correction, gamma conversion, edge emphasis, resolution conversion, noise reduction, image brightness, contrast, etc., on the digital image data transferred from the imaging element 110. Then, the processed image data is output to the memory 132. The data output by the video signal processor 121 is used for exposure control, autofocus control, etc.

[0028] The memory 132 temporarily stores data when the CPU 131 performs various processes, in addition to the output image data of the video signal processing unit 121. That is, the memory 132 functions as a RAM (RANDOM MACCESS MEMORY) that expands and executes a program read from a non-volatile memory 133 (described later).

[0029] The non-volatile memory 133 is a non-volatile recording element that functions as a ROM (READ ONLY MEMORY) in the camera 100, and stores programs for operating the CPU 131, various adjustment parameters, and the like.

[0030] The timing generating section 142 is a timing generator that provides the imaging element 110 and the video signal processing section 121 with timing for executing various operations.

[0031] The bus 150 is connected to the memory 132, the non-volatile memory 133, a power supply 160 (to be described later), a display control unit 151, a touch panel 156, a card input / output unit 171, and various switches. The various switches are a main switch 161, a first release switch 162, a second release switch 163, and an operation unit 164. The operation unit 164 includes input devices for receiving user operations, including, for example, a pointing device such as a mouse or a touch pad, a decision button, up / down / left / right buttons, a dial, a joystick, and the like.

[0032] The power supply 160 is a power supply means that supplies power to each circuit provided inside the camera 100 .

[0033] The display control unit 151 is a display control means that converts image data output from the video signal processing unit 121 into analog image data for display and controls display on the display unit 153. For example, the display control unit 151 converts the display image data stored in the memory 132 from digital image data to analog image data for display in the D / A conversion unit 152 in response to a signal from the timing generation unit 142 via the bus 150. The converted analog image data is displayed on the display unit 153 such as a TFT made of a liquid crystal display element, or on an external display unit (not shown) provided externally via a cable such as a VIDEO output terminal 154 or an HDMI (registered trademark) output terminal 155.

[0034] Touch panel 156 is formed integrally with display unit 153, and notifies CPU 131 of the position on the surface of display unit 153 that the user touches as coordinate information.

[0035] A removable recording medium 173, such as an SD card, can be inserted into the card slot 172. The recording medium 173 is electrically connected to the card input / output unit 171 when inserted into the card slot 172. In this state, it is possible to record image data recorded in the memory 132 onto the recording medium 173. It is also possible to read data recorded inside the recording medium 173 by the camera 100.

[0036] CPU (CENTRAL PROCESSING UNIT) 131 is connected to each part of camera 100 via bus 150, and is a control means capable of centrally controlling each part of camera 100 and accessories attached to camera 100. Note that as long as CPU 131 is configured to control the driving of each part in camera 100, the configuration may not include each control unit and processing unit as described above. Alternatively, the configuration may be such that CPU 131 is not provided, and the above-mentioned control units and processing units each perform control (processing) in cooperation with each other to control the driving of each part of camera 100. The above is an example of a camera system according to this embodiment.

[0037] (Basic operation of camera 100) Hereinafter, the basic operation of the camera 100 according to this embodiment will be described with reference to Fig. 1. First, when the main switch 161 is turned on by the user, the power source 160 supplies power to each component constituting the camera 100.

[0038] Next, when power is supplied to each component of the camera 100 , a light beam corresponding to a subject that enters the interior of the camera 100 via the lens unit 200 is focused on the image sensor 110 .

[0039] Next, image data is read from the imaging element 110 at a predetermined timing (for example, 60 times per second), and after various processes are executed, the image data is arranged in the VRAM of the memory 132. This allows the image data taken from the imaging element 110 to be sequentially displayed (live view) on the display unit 153.

[0040] Next, the user can select and set various parameters displayed on the GUI by operating the operation unit 164. For example, the shutter speed, aperture value, ISO sensitivity, and the like can be set as exposure control values ​​that can be adjusted in the camera 100.

[0041] Next, first release switch 162 (hereinafter SW1) is turned on by the first stroke (half-pressed state) of the release button (not shown), and starts preparation for imaging the subject. Here, as details of the imaging preparation, the above-mentioned drive control of lens 201 by lens control unit 204 and strobe emission control by emission control unit 181 are executed as necessary. Then, second release switch 163 (hereinafter SW2) is turned on by the second stroke (full-pressed state) of the release button (not shown), and starts imaging the subject.

[0042] (Lens change control) Hereinafter, control when the lens unit 200 is attached to the camera 100 according to this embodiment will be described with reference to the flowchart shown in Fig. 4. Fig. 4 is a diagram showing a flowchart relating to the attached lens detection process according to the first embodiment of the present invention.

[0043] Note that the members (e.g., whether or not an APD filter is present) and characteristics (e.g., the characteristics of the APD filter) of the lens unit differ depending on the type of lens unit attached to camera 100. That is, the relationship between the F-number and the T-number as shown in Fig. 3 changes depending on the type of lens unit (or the type of APD filter) attached to camera 100. Therefore, when a new lens unit is attached to camera 100, it is necessary to update the correspondence between the F-number and the T-number depending on the type of lens unit.

[0044] First, CPU 131 detects that a lens unit is attached to camera 100, starts attached lens detection processing, and in step S401 detects whether an APD filter is included in the lens unit attached to camera 100. In the following description, it is assumed that lens unit 200 including APD filter 202 is attached to camera 100.

[0045] Note that the presence or absence of a lens unit attached to camera 100 may be detected, for example, based on a voltage change at any terminal among a group of terminals provided on camera mount 102 and lens mount 207. Specifically, the voltage level indicated by the terminal provided on camera mount 102 may be different between a state in which a camera accessory corresponding to camera 100 is not attached and a state in which the camera accessory is attached.

[0046] As a method for detecting whether or not the camera accessory attached to the camera 100 is the lens unit 200 including the APD filter 202, for example, a configuration in which the CPU 131 inquires of the lens control unit 204 may be used. Note that a configuration in which a terminal different from that used when detecting whether or not the camera accessory is attached to the camera 100 as described above is used to determine the type of the camera accessory based on a voltage level indicated by the terminal may also be used.

[0047] However, the detection of the attachment state of the lens unit to the camera 100 is not limited to this. For example, a configuration may be adopted in which the user manually inputs the attachment state of the camera accessory to the camera 100 and the type of the attached camera accessory (for example, whether it is the lens unit 200 or not), and the CPU 131 detects the input contents.

[0048] If it is determined that the lens unit 200 equipped with the APD filter 202 is not attached to the camera 100 (NO in step S401), the attached lens detection process ends. On the other hand, if it is determined that the lens unit 200 equipped with the APD filter 202 is attached to the camera 100 (YES in step S401), the process proceeds to step S402.

[0049] Next, in step S402, the CPU 131 determines whether or not a T value / F value conversion table corresponding to the lens unit 200 is stored. Here, the T value / F value conversion table is a parameter table determined by the lens unit (more specifically, the type of APD filter), and details will be described later.

[0050] In this embodiment, a T value / F value conversion table corresponding to each of a plurality of lens units is stored in advance in the non-volatile memory 133. Therefore, when a T value / F value conversion table corresponding to the type of lens unit attached to the camera 100 is stored, the process of generating the T value / F value conversion table, which will be described later, can be omitted by reading out the external table.

[0051] If it is determined that the non-volatile memory 133 stores a T value / F value conversion table corresponding to the lens unit 200 (YES in step S402), the attached lens detection process ends. On the other hand, if it is determined that the non-volatile memory 133 does not store a T value / F value conversion table corresponding to the lens unit 200 (NO in step S402), the process proceeds to step S403.

[0052] Next, in step S403, the CPU 131 generates a list of T values ​​that can be set by the user. For example, if the user is allowed to change the brightness at regular intervals of 1 / 3 stop, a list of T values ​​that change in 1 / 3 stop units can be created. Note that the list of T values ​​is the same as the T value column shown in FIG. 5, which will be described later. Note that the T values ​​that can be set using the lens unit 200 can be read by the CPU 131 from the lens control unit 204.

[0053] Next, in step S404, the CPU 131 obtains an F value corresponding to the T value list generated in step S403, and creates a T value / F value conversion table. For conversion from a T value to an F value, the CPU 131 reads out a corresponding F value from the lens control unit 204 for each T value in the T value list, and generates a list of F values. Then, the CPU 131 creates a T value / F value conversion table based on the list of corresponding T values ​​and F values. Fig. 5 is a diagram showing an example of a T value / F value conversion table according to the present invention, and corresponds to the T value / F value conversion table read out in step S402, or the T value / F value conversion table generated in steps S403 to S404.

[0054] Note that a configuration may be adopted in which a predetermined formula for calculating the T value is stored in the non-volatile memory 133, and the CPU 131 creates a T value / F value conversion table in response to a change in the amount of light corresponding to a change in the number of F value steps of the aperture 203 of the lens unit 200. In this case, it is not necessary for the lens unit 200 to store information related to the T value, but the processing load on the camera 100 increases, and furthermore, it is uncertain whether the optical characteristics of the APD filter 202 and the characteristics of the created T value / F value conversion table will match.

[0055] Furthermore, this embodiment is not limited to a configuration in which CPU 131 creates a T value / F value conversion table. For example, a configuration may be adopted in which the T value / F value conversion table is stored in a memory (not shown) provided in the lens unit, and CPU 131 reads out the T value / F value conversion table from the memory of the lens unit when the lens unit is attached to camera 100. The above is the attached lens detection process according to this embodiment.

[0056] 4, the T value / F value conversion table is not referenced (generated) when the camera accessory attached to camera 100 is not provided with an APD filter, but the present invention is not limited to this. For example, when a lens unit not equipped with an APD filter is attached to camera 100, a conversion table in which the T value=the F value may be generated.

[0057] (Control when changing lens units with T-value compatible lens units attached) Hereinafter, with respect to the camera 100 according to this embodiment, a control method when replacing a lens unit in a state where a T-value compatible lens unit 200 is attached to the camera 100 will be described with reference to FIG. 6. FIG. 6 is a flowchart of a display process of the T value and the F value in a state where a T value compatible lens unit is attached to the camera 100 according to the present invention. In this embodiment, the T value compatible lens unit is a lens unit that can notify the camera 100 of its own aperture value as a T value. However, a lens unit whose F value does not change linearly with respect to a change in the T value, such as the lens unit 200 having the APD filter 202, may be configured as the T value compatible lens unit. This is because, when a lens unit whose F value does not change linearly with respect to a change in the T value is attached to the camera 100, the user can easily grasp the change in brightness with respect to the change in the aperture value if the user can confirm the change in the T value or the F value.

[0058] First, the CPU 131 detects that a lens unit has been attached to the camera 100, and starts a process of displaying the T-value and the F-value when the T-value compatible lens unit is attached. The method of detecting attachment of the lens unit 200 to the camera 100 is the same as the attached lens detection process described above, and therefore a description thereof will be omitted. In step S601, the CPU 131 reads out the T-value corresponding to the current state of the aperture 203 from the non-volatile memory 133, and controls the display control unit 151 to display the T-value on the display unit 153.

[0059] Fig. 8(a) is a display example of a user interface displayed in step S601, where the T value is displayed as indicated by icon 801 in the figure. Fig. 8 is a diagram for explaining a display example of a user interface using display unit 153 according to the present invention, where icons shown at the bottom of the figure indicate each exposure control value related to exposure control. Fig. 8(a) shows a case where the T value is displayed as the aperture value, and Fig. 8(b) exemplarily explains a case where the F value is displayed as the aperture value.

[0060] Next, in step S602, the CPU 131 controls the lens control unit 204 of the lens unit 200 to drive the diaphragm 203 based on the T value stored in the non-volatile memory 133. Upon receiving the instruction, the lens control unit 204 instructs the diaphragm driving unit 205 to drive the diaphragm, and the diaphragm driving unit 205 drives the diaphragm 203 so as to achieve the T value read out in advance. Note that either of the processes in steps S601 and S602 described above may be executed first, and further, each process may be executed in parallel.

[0061] Next, in step S603, CPU 131 calculates a value corresponding to the T value stored in nonvolatile memory 133. The method of calculating the F value is as described above in the attached lens detection process, so a description thereof will be omitted. Then, in step S604, CPU 131 records the F value calculated in step S603 in nonvolatile memory 133. As described above, since the T value has been previously recorded in nonvolatile memory 133, the T value and the F value are recorded in nonvolatile memory 133 by the process of step S604.

[0062] Next, in step S605, CPU 131 determines whether or not lens unit 200 attached to camera 100 has been replaced. This determination is made based on a voltage change at any terminal provided on each mount, as described above in the attached lens detection process. If it is determined that there has been no change in the camera accessory attached to camera 100 (NO in step S605), the process of step S605 is repeated. Note that if an instruction to change the aperture value is given by automatic exposure control or manual operation by the user, the process returns to step S601, and the processes of S601 to S605 are repeated.

[0063] If it is determined that the camera accessory attached to camera 100 has been replaced (YES in step S605), the process proceeds to step S606. Then, in step S606, CPU 131 determines whether or not the camera accessory currently attached to camera 100 is a lens unit compatible with the T-value display (i.e., the same type as lens unit 200). Note that the type of camera accessory attached to camera 100 is determined by CPU 131 inquiring of lens control unit 204, as described above in the attached lens detection process.

[0064] Here, the processing of steps S605 to S606 may be configured to be executed at the same timing as the processing of step S401 in the attached lens detection processing described above, in which case the processing results may be referred to in a different flowchart. Note that the processing method of steps S605 to S606 is not limited to the above, and for example, the processing of step S605 may be configured to be realized by data communication between the CPU 131 and the lens control unit 204.

[0065] If it is determined that the camera accessory currently attached to the camera 100 is a T-value compatible lens unit (YES in step S606), the process proceeds to step S607. If it is determined that the camera accessory currently attached to the camera 100 is a T-value incompatible lens unit (NO in step S606), the process proceeds to step S612.

[0066] In step S607, CPU 131 controls the diaphragm drive via lens control unit 204 of lens unit 200 based on the T value recorded in non-volatile memory 133 at the time of the previous step S604. Then, in step S608, CPU 131 controls display unit 153 to display the currently set T value (i.e., the T value recorded in non-volatile memory 133 at the time of the previous step S604). The display example at this time is the same as that shown in FIG. 8(a) as described above. Note that, like steps S601 to S602, the processing order of steps S607 to S608 may be reversed or may be performed at the same timing. By the processing of steps S607 to S608, the display of the T value in camera 100 does not change before and after the replacement of the lens unit, and the user does not feel uncomfortable.

[0067] Next, in step S609, the CPU 131 calculates the F-number corresponding to the T-number set in steps S607 to S608. The method of calculating the F-number is as described above in the attached lens detection process, and therefore a description thereof will be omitted.

[0068] Next, in step S610, CPU 131 determines whether or not the F-number calculated in step S609 is different from the F-number recorded in non-volatile memory 133 at the previous time point in step S604. If it is determined that the F-numbers before and after the replacement of the lens unit are not the same (YES in step S610), the F-number is updated for recording, recorded in non-volatile memory 133, and the process ends. If the F-numbers before and after the replacement of the lens unit are the same, the process ends as is.

[0069] Next, a case where the replaced camera accessory is not a lens compatible with the T value will be described. In step S612, CPU 131 controls diaphragm drive via lens control unit 204 of lens unit 200 based on the F value recorded in non-volatile memory 133 at the previous time point of step S604. Then, in step S613, CPU 131 controls display unit 153 to display the currently set F value (i.e., the F value recorded in non-volatile memory 133 at the previous time point of step S604), and ends the process. Fig. 8(b) is an example of a display of a user interface displayed in step S613, and the F value is displayed as shown by icon 802 in the figure.

[0070] As described above, when a camera accessory is replaced with a T-value compatible lens attached to camera 100, the optimal aperture value according to the aperture state can be displayed regardless of whether the replaced camera accessory is a T-value compatible lens or not. Also, when the camera accessory attached to camera 100 is replaced from a T-value compatible lens to a T-value compatible lens, no discrepancy in T values ​​occurs before and after the camera accessory is replaced, so that it is possible to suppress a sense of discomfort felt by the user.

[0071] (Control when changing lens units with a lens unit that does not support T-stop) Hereinafter, with regard to the camera 100 according to this embodiment, a control method for replacing a lens unit in a state where a T-value incompatible lens unit is attached to the camera 100 will be described with reference to Fig. 7. Fig. 7 is a flowchart relating to a display process of the T-value and F-value in a state where a T-value compatible lens unit is attached to the camera 100 according to the present invention.

[0072] First, the CPU 131 detects that a lens unit has been attached to the camera 100, and starts a process of displaying the T-value and the F-value when the T-value non-compatible lens unit is attached. The method of detecting attachment of a lens unit to the camera 100 is the same as the above-mentioned attached lens detection process, so a description thereof will be omitted. In step S701, the CPU 131 reads out the F-value corresponding to the current state of the aperture 203 from the non-volatile memory 133, and controls the display unit 153 via the display control unit 151 to display it. FIG. 8(b) is an example of a user interface displayed in step S701, and the F-value is displayed as indicated by the icon 802 in the figure.

[0073] Next, in step S702, CPU 131 controls the driving of diaphragm 203 based on the F-number stored in non-volatile memory 133. The lens unit side receiving the instruction drives the diaphragm so as to achieve the F-number read out in advance. Note that, of the processes of steps S701 and S702 described above, either process may be executed first, and further, each process may be executed in parallel.

[0074] Next, in step S703, CPU 131 determines whether or not the lens unit attached to camera 100 has been replaced. If an instruction to change the aperture value is given by automatic exposure control or a manual operation by the user, the process returns to step S701 and the processes of S701 to S703 are repeated.

[0075] If it is determined that the camera accessory attached to camera 100 has been replaced, the process proceeds to step S704. Then, in step S704, CPU 131 determines whether or not the camera accessory currently attached to camera 100 is a lens unit compatible with the T value display (i.e., the same type as lens unit 200). Note that the processes in steps S703 to S704 are substantially the same as those in steps S605 to S606 described above, and therefore detailed description thereof will be omitted.

[0076] Next, in step S705, CPU 131 reads out the F-number that was set before the camera accessory was replaced, which is recorded in non-volatile memory 133. Then, CPU 131 controls the aperture drive via lens control unit 204 of lens unit 200 based on the read F-number.

[0077] Next, in step S706, CPU 131 calculates the T value for the F value set in step S705. Note that in step S706, CPU 131 may calculate the T value based on the T value / F value conversion table as described above in the attached lens detection process, and detailed description thereof will be omitted.

[0078] Next, in step S707, CPU 131 controls display unit 153 to display the T value calculated in step S706 (i.e., the T value based on the current state of aperture 203). The display example at this time is the same as that in FIG. 8(a), as described above. By the processes of steps S705 to S707, it is possible to display a T value that corresponds to the F value of the lens unit before replacement and further corresponds to the state of lens unit 200 after replacement immediately after replacement of the lens unit. Note that in step S707, a configuration may be adopted in which the newly calculated T value and the recorded F value used in calculating the T value (i.e., the F value that was displayed before the lens unit was replaced) are displayed simultaneously.

[0079] Next, in step S708, the CPU 131 records the T value calculated in step S706 in the non-volatile memory 133, and ends the process. Note that the order of steps S707 and S708 may be reversed, or both may be executed in parallel.

[0080] Next, a description will be given of aperture value display control in a case where it is determined in step S704 that the replaced camera accessory is not a T-value compatible lens (in this embodiment, it is a T-value incompatible lens). In step S709, CPU 131 reads out the F-value that was set before the camera accessory was replaced, which is recorded in non-volatile memory 133. Then, CPU 131 controls aperture drive via lens control unit 204 of lens unit 200 based on the read F-value.

[0081] Then, in step S710, the CPU 131 controls the display unit 153 to display the currently set F-number, and ends the process. An example of the user interface displayed in step S710 is substantially the same as that shown in FIG. 8(b) described above.

[0082] As described above, in this embodiment, when the camera accessory is replaced with a lens that does not support T values ​​attached to the camera 100, if the replaced camera accessory is a lens that supports T values, the optimal T value according to the F value before replacement can be displayed. Therefore, the camera 100 according to this embodiment can set a T value suitable for the brightness of the subject based on the aperture setting of the lens unit before replacement, and further notify the user of the T value. Also, if the replaced camera accessory is a lens that does not support T values, the same F value can be set before and after the replacement of the lens unit and notified to the user. With the configuration described above, it is possible to prevent an unnatural image from being captured that is not intended by the user.

[0083] Second embodiment (Aperture value display processing according to the settings of the camera 100) In the first embodiment described above, a configuration was described in which control is performed so that the T value is displayed with priority when a T value compatible lens is attached to the camera 100. In contrast, in this embodiment, a configuration in which control is performed so that the optimal aperture value between the T value and the F value is displayed based on various determination results will be described with reference to the flowchart in Fig. 9. Note that the configurations and basic driving method of the camera 100, which is an imaging device according to this embodiment, and the lens unit 200, which is a camera accessory, are substantially the same as those in the first embodiment described above, so the same reference numerals are assigned to the respective parts and their descriptions will be omitted.

[0084] Fig. 9 is a flowchart showing a T value / F value display determination process according to the second embodiment of the present invention. The process based on the flowchart shown in Fig. 9 may be executed at any timing in the startup sequence of the camera 100 or the image capture sequence of the subject. For example, in this embodiment, it is assumed that the process according to the flowchart shown in Fig. 9 is executed when a camera accessory attached to the camera 100 is attached or detached, but the process according to the flowchart shown in Fig. 9 may also be executed when the power of the camera 100 is turned on.

[0085] When the T value / F value display determination process is started, first, in step S901, CPU 131 determines whether or not a lens unit is attached to camera 100. The lens unit in the determination in step S901 is a lens unit that has an aperture and can be driven and controlled from camera 100 when attached to camera 100. If it is determined in step S901 that a lens unit is not attached (NO in step S901), CPU 131 controls display unit 153 in step S902 so as not to display specific values ​​of T value and F value. In this embodiment, in the process of step S902, 0 or a horizontal line is displayed in the display area of ​​aperture value on display unit 153 to notify the user that a lens unit corresponding to the display of T value and F value is not attached. In addition to this, the process of step S902 may have any configuration as long as it can notify the user that a lens unit corresponding to the display of T value and F value is not attached.

[0086] Next, if it is determined in step S901 that a lens unit is attached (YES in step S901), in step S903, CPU 131 determines whether or not information on the T value and the F value can be acquired from the lens unit attached to camera 100. If only information on either the T value or the F value can be acquired in the process of step S903, the process proceeds to step S904. If information on both the T value and the F value can be acquired in the process of step S903, the process proceeds to step S905.

[0087] Next, in step S904, CPU 131 displays an aperture value based on information relating to the T value or F value acquired from the lens unit attached to camera 100 in the aperture value display area of ​​display unit 153.

[0088] Next, in step S905, CPU 131 determines whether the priority setting method of the aperture value currently set in camera 100 is brightness priority setting (brightness priority mode). Note that the brightness priority setting in this embodiment refers to a case where the user sets the subject to an arbitrary brightness, such as when exposure compensation is applied, when AEB shooting (exposure bracket shooting), or when light emission shooting is performed using a light emitting device. Note that the camera 100 may be configured to have in advance a setting item (first shooting condition) that corresponds to the brightness priority setting and that preferentially displays the T value, as a setting item that can display both the T value and the F value.

[0089] If it is determined that the brightness priority setting is on (YES in step S905), in step 906, CPU 131 displays an arbitrary T value in the aperture value display area of ​​display unit 153 based on information about the T value acquired from the lens unit side. Note that an example of the display on display unit 153 by the process of step S906 corresponds to the above-mentioned FIG. 8(a).

[0090] If it is determined that the brightness priority setting is not performed (NO in step S905), the process proceeds to step 907. Then, in step S907, CPU 131 determines whether or not the priority setting method of the aperture value currently set in camera 100 is a depth priority setting (depth priority mode). Note that the depth priority setting in this embodiment refers to a case where the intention of the user to set an arbitrary depth of field is prioritized, such as when the shooting mode of camera 100 is aperture priority mode or manual mode, or when depth stacking mode is set. Note that, as a setting item of camera 100 capable of displaying both the T value and the F value, a setting item (second shooting condition) that prioritizes displaying the F value, which corresponds to the depth priority setting, may be provided in advance.

[0091] The depth priority setting according to the present embodiment may be a shooting condition that allows the user to set the depth of field as intended, more than the brightness priority setting, that is, the brightness priority setting is a shooting condition that allows a higher degree of freedom in setting the depth of field. On the other hand, the brightness priority setting according to the present embodiment is a shooting condition that prioritizes the accuracy of exposure control for the brightness of the subject over the adjustment of the depth of field, and in this embodiment, the brightness priority setting corresponds to a shooting condition in which the user cannot arbitrarily set the depth of field. For example, when distinguishing by shooting mode, the auto mode and program mode in which the camera automatically adjusts the exposure control value, and the priority mode (Tv priority mode, Sv priority mode, etc.) in which the user prioritizes and sets values ​​other than the aperture value correspond to the brightness priority setting. In addition, the priority mode (Av priority mode) in which the user can set an arbitrary aperture value, the manual mode in which the user can manually set all exposure control values, etc. correspond to the depth priority setting.

[0092] In addition, as a shooting condition in which there is more freedom in setting the depth of field than in the brightness priority setting, specifically, a configuration is envisaged in which the depth priority setting has more items that the user can set regarding the depth of field than the brightness priority setting.

[0093] If it is determined that the depth priority setting is on (YES in step S907), in step 908, CPU 131 displays an arbitrary F-number in the aperture value display area of ​​display unit 153 based on information related to the F-number acquired from the lens unit side. Note that an example of the display on display unit 153 by the process of step S908 corresponds to the above-mentioned FIG. 8(b).

[0094] If it is determined that the depth priority setting is not set (NO in step S907), the process proceeds to step 909. For example, when both the T value and the F value can be acquired, such as when lens unit 200 is attached to camera 100, it is preferable to perform various processes (such as AE and WB adjustment) based on the T value, which indicates the brightness of the subject captured by camera 100 more accurately than the F value. Therefore, in step S909, CPU 131 displays an arbitrary T value in the aperture value display area of ​​display unit 153 based on information related to the T value acquired from the lens unit side, and ends the T value / F value display determination process.

[0095] As described above, in this embodiment, the form of the aperture value notified to the user can be changed depending on whether a lens unit is attached to camera 100, the type of lens unit, and various shooting conditions in camera 100. Therefore, camera 100 according to this embodiment can display (notify) the optimal aperture value depending on the situation, and can reduce the sense of discomfort felt by the user depending on the display (notification) content related to the aperture value.

[0096] Third embodiment (Aperture value display processing during image playback) In the above-described embodiment, the display process of the aperture value when capturing an image of a subject has been described. In contrast, in the present embodiment, the display process of the aperture value when reproducing image data obtained by capturing an image of a subject with the lens unit 200 attached to the camera 100 will be described with reference to Fig. 10. That is, in the present embodiment, the display control of the aperture value when reproducing image data obtained by an imaging device capable of displaying (reporting) both the T value and the F value will be described.

[0097] The configuration and basic driving method of the camera 100, which is an imaging device according to this embodiment, and the lens unit 200, which is a camera accessory, are substantially the same as those of the first embodiment described above, so the same reference numerals are used for each part and the description will be omitted. In addition, in this embodiment, a case where image data is reproduced and displayed by the camera 100 will be described as an example, but even if the image data is reproduced and displayed by an electronic device other than the camera 100, the aperture value display process during image reproduction described below is applicable. For example, even if the image data acquired by the imaging device is reproduced by an external electronic device (e.g., a PC, etc.) that can read the image data based on various methods, the aperture value display process during image reproduction described below is applicable.

[0098] FIG. 10 is a flowchart showing the aperture value display process during image playback according to the third embodiment of the present invention. As shown in FIG. 10, in response to an instruction to play back any image data in the camera 100, in step S1001, the CPU 131 reads the contents of the image data recorded inside the recording medium 173 into the memory 132. When the reading is completed, the process proceeds to step S1002. Note that if no image data that can be read is recorded in the recording medium 173, the currently executed aperture value display process during playback is terminated. Here, in this embodiment, it is assumed that in the process of step S1001, image data obtained under the shooting conditions when capturing an image of a subject as shown in FIG. 11(a) is recorded in the recording medium 173. A detailed description of FIG. 11 will be given later.

[0099] Next, in step S1202, CPU 131 analyzes the content data expanded in memory 132 and determines the type of the content. Then, CPU 131 determines whether the content type is a moving image based on the determination result. Note that the content in this embodiment refers to a file format, a codec, etc., and can determine whether image data is a still image or a moving image, for example.

[0100] If it is determined that the image data previously read is not a moving image (NO in step S1002), the image data corresponding to the content read in step S1001 is a still image, and the process proceeds to step S1003. Then, in step S1003, CPU 131 analyzes the content data expanded in memory 132 and acquires information related to the F-number from the metadata. Then, in step S1004, CPU 131 issues a display instruction to display control unit 151 based on the information related to the F-number acquired in step S1003, and causes an arbitrary F-number to be displayed in the aperture value display area of ​​display unit 153.

[0101] Here, Fig. 11 is a diagram for explaining a display example of the display unit by the aperture value display process when reproducing image data according to the present invention. The explanation of each figure corresponding to Fig. 11 will be given later. Fig. 11(e) is a display example displayed on the display unit 153 by the process of step S1004. As shown in Fig. 11(e), an icon 1105 indicating the F-number is displayed in the aperture value display area together with icons indicating other contents.

[0102] Next, if it is determined that the image data previously read is a video (YES in step S1002), in step S1005, CPU 131 determines whether or not the previously read content is a video (MP4 video) that is not compatible with the T value as a metadata standard. Note that in this embodiment, MP4 is taken as an example of a file format for video that is one of the metadata standards and is not compatible with the display of the T value, but the file format that is not compatible with the display of the T value is not limited to this.

[0103] If it is determined that the previously read content does not correspond to an MP4 video (NO in step S1005), the image data corresponding to the content read in step S1001 is a video corresponding to the T value, and therefore the process proceeds to step S1006. Then, in step S1006, the CPU 131 analyzes the content data expanded in the memory 132 and acquires information about the T value from the metadata. Then, in step S1007, the CPU 131 issues a display instruction to the display control unit 151 based on the information about the T value acquired in step S1006, and causes an arbitrary T value to be displayed in the aperture value display area of ​​the display unit 153. FIG. 11(b) is a display example displayed on the display unit 153 by the process of step S1007. As illustrated in FIG. 11(b), an icon 1102 indicating the T value is displayed in the aperture value display area together with icons indicating other content.

[0104] Next, if it is determined that the previously read content corresponds to an MP4 video (YES in step S1005), in step S1008 CPU 131 analyzes the content data expanded in memory 132 and acquires information related to the F-number from the metadata. Note that the reason information related to the F-number is acquired in step S1008 is because, if the determination in step S1008 is advanced, it can be determined that information related to the T-number when the subject was imaged is not recorded in the previously read content data.

[0105] Next, in step S1009, CPU 131 determines whether data relating to a conversion table indicating conversion information between T value and F value can be read. For example, when lens unit 200 is attached to camera 100, camera 100 can calculate the T value when an object is captured based on a T value / F value conversion table stored somewhere on the lens unit 200 side. Therefore, in this embodiment, when the conversion table can be read, the T value when an object is captured is used for image display based on the conversion table and information on the F value included in the previously read content data.

[0106] If it is determined that the T value / F value conversion table is available (YES in step S1009), the process proceeds to step S1010. Then, in step S1010, the CPU 131 calculates a corresponding T value based on the information on the F value obtained by analyzing the content data expanded in the memory 132 and the T value / F value conversion table. Note that the method of calculating the T value using the T value / F value conversion table is substantially the same as that in the first embodiment described above, and therefore a description thereof will be omitted.

[0107] Next, in step S1011, CPU 131 issues a display instruction to display control unit 151 to display the F-number determined in the process of step S1008 together with the T-number calculated in step S1010 in the aperture value display area of ​​display unit 153. Fig. 11(c) is a display example displayed on display unit 153 by the process of step S1011. As shown in Fig. 11(c), icon 1103 indicating the F-number and T-number is displayed in the aperture value display area together with icons indicating other content.

[0108] In this embodiment, when the T value can be calculated based on the T value-F value conversion table, the T value calculated based on the conversion table is displayed in parentheses following the F value included in the content data of the image data to be played back. Although the display method of the T value for the F value is not limited to this, in this embodiment, the display method of the T value on the display unit 153 is made different between the case where the T value is calculated based on the T value-F value conversion table and the case where the T value is calculated based on another calculation formula to be described later. This is to adopt a display method that reflects the accuracy of the T value calculated by each method. For example, the accuracy of the T value calculated by calculation is lower in the display example illustrated in FIG. 11(d) to be described later than the display example illustrated in FIG. 11(c). In addition, the calculation method of the T value corresponding to the display example illustrated in FIG. 11(d) will be described later.

[0109] Furthermore, in this embodiment, an example has been described in which image data is reproduced by camera 100, but an external electronic device may also be configured to execute the processes of steps S1010 to S1011 if the T value / F value conversion table is available.

[0110] Next, if it is determined that the T value / F value conversion table is not available (NO in step S1009), in step S1012, CPU 131 calculates the T value based on equation (1) in the first embodiment described above.

[0111] Next, in step S1013, CPU 131 determines whether or not the F-number obtained in the process of step S1008 is a value near the maximum aperture. As described in the first embodiment, for example, in lens unit 200, the change in T-number may not be constant with respect to the change in F-number on the maximum aperture side, and an accurate T-number cannot be obtained even if the T-number is calculated from the F-number based on formula (1). Note that in this embodiment, the range of F-numbers that is two stops smaller than the maximum aperture of the aperture is set to a value near the maximum aperture of the aperture.

[0112] If it is determined that the F-number in the image data to be reproduced is not near the maximum aperture (NO in step S1013), then in step S1014, CPU 131 causes the F-number and T-number to be displayed together in the aperture value display area of ​​display unit 153, similar to step S1011 described above. That is, in step S1014, CPU 131 displays the T-number calculated based on formula (1) in parentheses following the F-number, as shown in FIG. 11(c).

[0113] On the other hand, if it is determined that the F-value in the image data to be played back is near full aperture (YES in step S1013), the process proceeds to step S1015. Then, in step S1025, the CPU 131 issues a display instruction to the display control unit 151, and controls the display unit 153 to display together the F-value calculated in step S1008 and the T-value calculated in step S1012. Fig. 11(d) is an example of a display displayed on the display unit 153 by the process of step S1015. As shown in Fig. 11(d), an icon 1104 indicating the F-value and T-value is displayed in the aperture value display area together with icons indicating other content.

[0114] As described above, when the process of step S1015 is executed, the F-value at the time of shooting corresponds to near the maximum aperture, and therefore the accuracy of the T-value calculated in step S1012 is low with respect to the F-value obtained in step S1008. Therefore, in this embodiment, the method of displaying the T-value in the process of step S1015 is different from the processes of steps S1011, S1014, etc., and the T-value is displayed in gray. That is, the display of the T-value in step S1015 is a reference value, and in order to inform the user of this, the method of displaying the T-value is different from other cases. This concludes the aperture value display process when playing back image data in this embodiment.

[0115] As described above, in this embodiment, when image data is reproduced, the form of the aperture value notified to the user can be changed according to the content data corresponding to the image data. Therefore, the camera 100 according to this embodiment can display (notify) the optimal aperture value according to the situation even when image data is reproduced, and the display (notification) content regarding the aperture value can reduce the sense of incongruity felt by the user. In particular, by suppressing the inconsistency in the display form of the aperture value between when capturing an image of a subject and when reproducing the captured image, the sense of incongruity felt by the user can be reduced when reproducing the image data.

[0116] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. For example, in the above-mentioned embodiment, the lens unit 200 is described as having the APD filter 202, but the present invention is not limited to this. For example, the APD filter may be provided inside a lens adapter that is detachable from the camera 100. In this case, the lens adapter may have the above-mentioned terminal group, and the camera 100 may read conversion information between the T value and the F value from the lens adapter or the lens unit via the lens adapter.

[0117] In the above-described embodiment, the APD filter 202 is used to vary the light transmittance in the radial direction relative to the optical axis, but the present invention is not limited to this. The above-described embodiment can also be applied to a configuration using an optical member other than the APD filter 202 as long as the light transmittance in the radial direction relative to the optical axis can be varied.

[0118] In the above-described embodiment, a configuration has been described in which information about the aperture value is displayed on a main monitor provided in the imaging device, such as display unit 153 of camera 100, but the present invention is not limited to this. For example, a configuration may be used in which information about the aperture value, such as the T number and F number, is displayed on a display unit other than the main monitor, such as an EVF (ELECTRICAL VIEW FINDER) or an information display unit provided on the top cover of the imaging device.

[0119] In the above-mentioned embodiment, the components constituting the imaging system cooperate with each other around the CPU 131 to control the operation of the entire device, but the present invention is not limited to this. For example, a (computer) program according to the flow shown in each of the above-mentioned figures is stored in the non-volatile memory 133 of the camera 100 in advance. The program may be executed by the CPU 131 or the like to control the operation of the entire imaging system. As long as the program has a function, the program may be in any form, such as object code, a program executed by an interpreter, or script data supplied to an OS. The recording medium for supplying the program may be, for example, a hard disk, a magnetic recording medium such as a magnetic tape, or an optical / magneto-optical recording medium.

[0120] In the above-described embodiment, a digital camera has been assumed as an example of an imaging device for implementing the present invention, but the present invention is not limited thereto. For example, various imaging devices may be used, such as portable devices such as digital video cameras and smartphones, wearable terminals, and security cameras. Furthermore, as described above, the aperture value display process during image data playback may be performed by an electronic device such as a PC that does not have an imaging function.

[0121] (Other embodiments) The present invention can also be realized by a process in which a program for realizing one or more functions of the above-mentioned embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) for realizing one or more functions. [Explanation of symbols]

[0122] 100 Cameras 110 Image sensor 131 CPU 151 Display control unit 153 Display section 200 Lens unit 202 APD filter

Claims

[Claim 1] a display means capable of reproducing and displaying moving image data obtained by an imaging device capable of changing an aperture value; means for acquiring information regarding an F-number stored in the video image data; A calculation means for calculating information on a corresponding T value from the information on the F value, The electronic device according to claim 1, wherein the display means displays information regarding the T value when the moving image data is reproduced.

Images