Electronic device, control method, and program

Abstract

To improve user's convenience by displaying a correct aperture value when reproducing a moving image.SOLUTION: The image pickup apparatus includes a display unit configured to reproduce and display moving image data obtained by an image pickup apparatus capable of changing an aperture value, an acquisition unit configured to acquire information relating to an F-number stored in the moving image data, and a calculation unit configured to calculate information relating to a corresponding T-number from the information relating to the F-number.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 for adjusting 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, is known. The diaphragm value, which relates to the state of the diaphragm (or the amount of light adjusted by the diaphragm), includes an F-number, which assumes that the transmittance of an optical system such as a lens is 100%, and a T-number, which takes the transmittance of the optical system into consideration.

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

[0004] An APD filter is a filter designed so that its transmittance decreases with increasing distance from the center of the optical axis in the direction perpendicular to the optical axis. Using this filter softens the contours of the blurred image and reduces double-line and ring-shaped 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 high-quality images with softer blurred contours in the background and highlighting the main subject.

[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 where the change in light intensity with respect to the change in aperture size is gradual and a second region where the change is more rapid than the first region. In other words, the light flux incident on the imaging device via the APD filter transmits different amounts of light in each region in the direction perpendicular to the optical axis of the lens, destroying the linearity of the change in light intensity with respect to the change in aperture diameter.

[0006] Regarding this deviation in the light quantity change ratio, Patent Document 1 discloses a technique for separately performing autofocus control and exposure control in response to the deviation in the light quantity change ratio relative to the change in aperture. [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 for displaying the aperture value when playing back a moving image captured using a lens that treats the aperture value as information about the T-value. For example, when acquiring a moving image in MP4 file format as video content, it is not possible to record information about the T-value as metadata to be added to the moving image. Therefore, even if a moving image is captured using a lens that can treat information about 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 could reduce user convenience.

[0009] An object of the present invention is to improve user convenience by displaying the 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 the F-number stored in the moving image data, and a calculation means for calculating information regarding the corresponding T-number from the information regarding the F-number, and is characterized in that the display means displays the information regarding the T-number when playing back the moving image data. [Effects of the Invention]

[0011] According to the present invention, the correct aperture value is displayed when a moving image is played back, thereby improving user convenience. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a block diagram illustrating the configuration of a camera 100 and a lens unit 200 that are an embodiment of an imaging device embodying the present invention. [Figure 2] 10 is a diagram illustrating an example of the transmittance of the APD filter 202 according to the present invention. FIG. [Figure 3] 10 is a diagram illustrating 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 attached lens detection processing according to the first embodiment of the present invention. [Figure 5] FIG. 2 is a diagram showing an example of a T value / F value conversion table according to the present invention. [Figure 6] 10 is a flowchart relating to a display process of the T-number and F-number when a T-number compatible lens unit is attached to the camera 100 according to the present invention. [Figure 7] 10 is a flowchart relating to a display process of the T-number and F-number when a T-number compatible lens unit is attached to the camera 100 according to the present invention. [Figure 8] 10A to 10C 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 a T value / F value display determination process according to the second embodiment of the present invention. [Figure 10] 10 is a flowchart showing aperture value display processing during image playback according to the third embodiment of the present invention. [Figure 11] 10A to 10C are diagrams illustrating examples of display on the display unit in accordance with the aperture value display process during image data playback according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] (First embodiment) (Basic configuration of imaging device) Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram illustrating the configuration of a camera 100 and a lens unit 200, which are embodiments 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 when different functional blocks are described as operating entities in the following description, they may be realized by the same hardware.

[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 the 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 varies stepwise in a radial direction of the APD filter 202, which is perpendicular to the optical axis and is based on an axis (optical axis) located at the center of the APD filter 202. Specifically, the APD filter 202 has a gradually decreasing light transmittance (light transmittance) and a gradually increasing filter density toward the outer side in the radial direction of the filter relative to the optical axis. Therefore, the amount of light transmitted by a light beam incident through the APD filter 202 varies in the radial direction relative 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).

[0019] T=F / Tr 1 / 2 ···(1) 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] 3 is a diagram illustrating an example of the correspondence relationship 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 match, for example, 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 indicated by the dashed line in Fig. 3.

[0021] In this embodiment, a change in brightness corresponding to one step of light intensity is, for example, a change in brightness corresponding to 1 Bv in an APEX (Additive System of Photographic Exposure) system. Generally, when the aperture diameter (effective diameter) of the iris changes by 1 / √2, the F-number changes by one step, and the light intensity (Bv value) also changes by one step. However, when the density near the maximum aperture of the iris 204 is higher (light transmittance is lower) than in other regions, as in the APD filter 202 of this embodiment, a difference occurs between the F-number and T-number near the maximum aperture of the iris 203. This is because, in the region of the APD filter 202 near the maximum aperture of the iris 203, even in the region where the F-number changes by one step, the amount of light passing through the APD filter 202 is less than 1 Bv. Note that a change in brightness corresponding to one step of F-number is synonymous with a change in brightness corresponding to 1 Bv 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, indicated by the solid line, is such that the difference between the T value and the F value decreases as the aperture 203 is narrowed, and when the F value exceeds a predetermined value (eight 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 (shifting to the open side), the greater the difference between the T value and the F value, and, for example, the light attenuation effect of the APD filter 202 becomes maximum when the aperture 203 is near the open limit. Specifically, in the lens unit 200 of this embodiment, the amount of light passing through the APD filter 202 decreases by approximately two steps when the aperture 203 is near the open limit, compared to a lens unit not equipped 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 below, and can control the lens unit 200 in response to control instructions from the CPU 131.

[0024] The lens mount 207 is a physical connection mechanism between the lens unit 200 and the camera 100, and is also capable of controlling the camera mount 102 provided on the camera 100, and is equipped 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 can communicate with each other.

[0025] Next, each component of camera 100 will be described with reference to Figure 1. Image sensor 110 is an imaging means employing a charge-storage solid-state image sensor such as a CMOS or CCD, which can receive a light beam from a subject guided into camera 100 via lens unit 200 and convert it into an electrical image signal. Since the electrical signal obtained by image sensor 110 is an analog value, it also has a function to convert it into a digital value. Based on the image signal output from image sensor 110, an evaluation value (photometric value) related to 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 by controlling the state of the shutter 103, the amount of light incident on the image sensor 110 can be adjusted. Note that, in this embodiment, a configuration is described in which the shutter 103 is used to adjust the exposure time of the image sensor 110, 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 without operating the shutter 103 by adjusting the reset, readout, and accumulation timing of the image sensor 110.

[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 image sensor 110. The processed image data is then output to 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 access memory) that expands and executes a program read from the nonvolatile memory 133 (described later).

[0029] The nonvolatile memory 133 is a nonvolatile storage 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 timings for executing various operations.

[0031] The bus 150 is connected to a memory 132, a nonvolatile 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, such as a pointing device such as a mouse or a touchpad, 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 the 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 up 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 using 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 comprehensively 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 the above-mentioned control units and processing units. 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) The basic operation of the camera 100 according to this embodiment will be described below with reference to Fig. 1. First, when the user turns on the main switch 161, the power supply 160 supplies power to each component of the camera 100.

[0038] Next, when power is supplied to each component of the camera 100 , a light beam corresponding to a subject that has entered 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 image sensor 110 at a predetermined timing (for example, 60 times per second), and after various processes are performed, the data is stored in the VRAM of the memory 132. This allows the image data captured from the image sensor 110 to be displayed sequentially on the display unit 153 (live view).

[0040] Next, the user can select and set various parameters displayed on the GUI by operating the operation unit 164. For example, the user can set the shutter speed, aperture value, ISO sensitivity, and the like 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 preparations for capturing an image of the subject begin. Here, details of the preparations for capturing an image include the drive control of lens 201 by lens control unit 204 and strobe light emission control by light emission control unit 181, as described above, being executed as necessary. Then, second release switch 163 (hereinafter SW2) is turned on by the second stroke (fully pressed state) of the release button (not shown), and preparations for capturing an image of the subject begin.

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

[0043] Note that the components (e.g., whether an APD filter is present) and characteristics (e.g., the characteristics of the APD filter) of the lens unit vary 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 varies 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, the correspondence between the F-number and the T-number needs to be updated depending on the type of lens unit.

[0044] First, CPU 131 detects that a lens unit has been 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 explanation, it is assumed that lens unit 200 equipped with 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 the terminal groups 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] Furthermore, a method for detecting whether the camera accessory attached to camera 100 is lens unit 200 including APD filter 202 may be, for example, a configuration in which CPU 131 inquires of lens control unit 204. Note that a configuration may also be used in which a terminal different from that used when detecting whether or not a camera accessory is attached to camera 100 as described above is used to determine the type of camera accessory based on the voltage level indicated by that terminal.

[0047] However, the detection of the attachment state of the lens unit to camera 100 is not limited to this. For example, the user may manually input the attachment state of the camera accessory to camera 100 and the type of the attached camera accessory (for example, whether it is lens unit 200 or not), and CPU 131 may detect the input content.

[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 depending on the lens unit (more specifically, the type of APD filter), and details will be described later.

[0050] In this embodiment, T value / F value conversion tables corresponding to each of a plurality of lens units are stored in advance in nonvolatile memory 133. Therefore, when a T value / F value conversion table corresponding to the type of lens unit attached to 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 T value / F value conversion table corresponding to the lens unit 200 is stored in the nonvolatile memory 133 (YES in step S402), the attached lens detection process ends. On the other hand, if it is determined that the T value / F value conversion table corresponding to the lens unit 200 is not stored in the nonvolatile memory 133 (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 in fixed intervals of 1 / 3 stop, a list of T values ​​that change in 1 / 3 stop increments 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, CPU 131 finds an F-value corresponding to the T-value list generated in step S403 and creates a T-value / F-value conversion table. To convert from a T-value to an F-value, CPU 131 reads the 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, CPU 131 creates the 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 in step S402 or the T-value / F-value conversion table generated in steps S403 to S404.

[0054] Alternatively, a predetermined formula for calculating the T value may be stored in the nonvolatile memory 133, and the CPU 131 may create a T value / F value conversion table in response to a change in the amount of light corresponding to a change in the F value step number of the aperture 203 of the lens unit 200. In this case, it is not necessary for the lens unit 200 to store information about the T value, but this increases the processing load on the camera 100, and 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 attached lens detection process according to this embodiment has been described above.

[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-number compatible lens units attached) A control method for changing a lens unit when a T-number-compatible lens unit 200 is attached to the camera 100 according to this embodiment will be described below with reference to FIG. 6. FIG. 6 is a flowchart illustrating a process for displaying the T-number and F-number when a T-number-compatible lens unit is attached to the camera 100 according to this embodiment. In this embodiment, the T-number-compatible lens unit is a lens unit that can notify the camera 100 of its own aperture value as a T-number. However, a lens unit whose F-number does not change linearly with changes in the T-number, such as the lens unit 200 equipped with the APD filter 202, may also be configured as a T-number-compatible lens unit. This is because, when a lens unit whose F-number does not change linearly with changes in the T-number is attached to the camera 100, the user can easily grasp the change in brightness in response to changes in the aperture value by checking the change in the T-number or F-number.

[0058] First, the CPU 131 detects that a lens unit has been attached to the camera 100, and starts processing to display the T-value and F-value when a T-value-compatible lens unit is attached. The method for detecting whether the lens unit 200 has been attached to the camera 100 is the same as the attached lens detection process described above, so 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 nonvolatile memory 133, and controls the display control unit 151 to display it on the display unit 153.

[0059] Fig. 8(a) is an example of a user interface displayed in step S601, in which the T-number is displayed as indicated by icon 801 in the figure. Fig. 8 is a diagram illustrating an example of a user interface display using display unit 153 according to the present invention, in which icons shown at the bottom of the figure indicate exposure control values ​​related to exposure control. Fig. 8(a) illustrates a case in which the T-number is displayed as the aperture value, and Fig. 8(b) illustrates an example in which the F-number 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 nonvolatile memory 133. Upon receiving the instruction, the lens control unit 204 instructs the diaphragm drive unit 205 to drive the diaphragm, and the diaphragm drive 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, the processes 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 for calculating the F value is as described above in the attached lens detection process, so 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, the T value has already been recorded in nonvolatile memory 133, and therefore the T value and F value are recorded in nonvolatile memory 133 by the processing of step S604.

[0062] Next, in step S605, CPU 131 determines whether the lens unit 200 attached to camera 100 has been replaced. This determination is made based on a voltage change at an arbitrary 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 the camera accessory currently attached to camera 100 is a lens unit that supports 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 referenced 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 aperture driving via lens control unit 204 of lens unit 200 based on the T value recorded in nonvolatile 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 nonvolatile 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, as with steps S601 and S602, the processing order of steps S607 and S608 may be reversed or may be performed at the same timing. By processing steps S607 and S608, the display of the T value on camera 100 does not change before and after changing the lens unit, preventing the user from feeling uncomfortable.

[0067] Next, in step S609, CPU 131 calculates the F-number corresponding to the T-number set in steps S607 and S608. The method for calculating the F-number is the same as that 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 the F-number calculated in step S609 is different from the F-number recorded in nonvolatile memory 133 at the previous time point in step S604. If it is determined that the F-numbers before and after lens unit replacement do not match (YES in step S610), the F-number is updated for recording, recorded in nonvolatile memory 133, and processing ends. If the F-numbers before and after lens unit replacement match, processing ends.

[0069] Next, a case where the replaced camera accessory is not a T-number compatible lens will be described. In step S612, CPU 131 controls aperture drive via lens control unit 204 of lens unit 200 based on the F-number recorded in nonvolatile 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-number (i.e., the F-number recorded in nonvolatile memory 133 at the previous time point of step S604), and ends the processing. Figure 8(b) is an example of a display of the user interface displayed in step S613, in which the F-number is displayed as indicated by icon 802 in the figure.

[0070] As described above, when a camera accessory is replaced with a T-number 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-number compatible lens. Also, when the camera accessory attached to camera 100 is replaced from a T-number compatible lens to a T-number compatible lens, no discrepancy in the T values ​​occurs before and after the camera accessory replacement, and therefore it is possible to prevent the user from feeling uncomfortable.

[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 changing the lens unit when a T-number incompatible lens unit is attached to the camera 100 will be described with reference to Fig. 7. Fig. 7 is a flowchart relating to the display process of the T-number and F-number when a T-number 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 processing to display the T-number and F-number when a T-number-incompatible lens unit is attached. Note that the method for detecting attachment of a lens unit to the camera 100 is the same as the attached lens detection processing described above, and therefore description thereof will be omitted. In step S701, the CPU 131 reads out the F-number 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. Figure 8(b) is an example of a user interface displayed in step S701, in which the F-number is displayed as indicated by 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 nonvolatile memory 133. The lens unit that receives the instruction drives the diaphragm so as to achieve the F-number that was read out in advance. Note that either of the processes in steps S701 and S702 described above may be executed first, and further, the processes 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 the camera accessory currently attached to camera 100 is a lens unit that supports T-value display (i.e., the same type as lens unit 200). Note that the processing in steps S703 to S704 is substantially the same as steps S605 to S606 described above, and therefore detailed description thereof will be omitted.

[0076] Next, in step S705, the CPU 131 reads the F-number that was set before the camera accessory was replaced, which is recorded in the nonvolatile memory 133. Then, the CPU 131 controls the diaphragm drive via the lens control unit 204 of the 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 shown in FIG. 8(a), as described above. By the processing 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 also corresponds to the state of lens unit 200 after replacement, immediately after the lens unit is replaced. Note that in step S707, the newly calculated T value and the recorded F value (i.e., the F value that was displayed before the lens unit was replaced) that was used to calculate the T value may be displayed simultaneously.

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

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

[0081] Then, in step S710, CPU 131 controls 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, if a camera accessory is replaced while a lens that does not support T-values ​​is attached to the camera 100, the optimal T-value based on the F-value before the replacement can be displayed if the replaced camera accessory is a lens that supports T-values. Therefore, the camera 100 according to this embodiment can set a T-value appropriate for the brightness of the subject based on the aperture setting of the lens unit before the replacement, and further notify the user of this T-value. Furthermore, 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. The configuration described above can prevent unnatural images from being captured unintentionally 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-number is displayed with priority when a T-number compatible lens is attached to the camera 100. In contrast, in this embodiment, a configuration is described with reference to the flowchart in Fig. 9 in which control is performed so that the most appropriate aperture value between the T-number and the F-number is displayed based on various determination results. Note that the configurations and basic driving methods 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, and therefore the same reference numerals are assigned to the respective components, and description thereof will be omitted.

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

[0085] When the T-value / F-value display determination process starts, first, in step S901, CPU 131 determines whether a lens unit is attached to camera 100. Note that the lens unit used in the determination in step S901 is a lens unit that includes an aperture and whose aperture 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 that specific values ​​of the T-value and F-value are not displayed. Note that in this embodiment, the process of step S902 displays 0 or a horizontal line in the aperture value display area of ​​display unit 153 to notify the user that a lens unit corresponding to the display of the T-value and F-value is not attached. Besides this, any configuration may be used for the process of step S902 as long as it can notify the user that a lens unit corresponding to the display of the 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), then in step S903 CPU 131 determines whether or not information on the T value and F value can be acquired from the lens unit attached to camera 100. If it is possible to acquire information on only one of the T value and F value in the processing of step S903, the processing proceeds to step S904. If it is possible to acquire information on both the T value and F value in the processing of step S903, the processing proceeds to step S905.

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

[0088] Next, in step S905, CPU 131 determines whether the priority setting method for the aperture value currently set in camera 100 is a 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 any brightness, such as when exposure compensation is applied, when AEB (exposure bracketing) photography is performed, or when light emission photography is performed using a light emitting device. Note that the camera 100, which is capable of displaying both the T value and the F value, may be configured to have in advance a setting item (first shooting condition) that corresponds to a brightness priority setting and that displays the T value preferentially, as a setting item.

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

[0090] If it is determined that brightness priority setting is not performed (NO in step S905), the process proceeds to step S907. Then, in step S907, CPU 131 determines whether the priority setting method for the aperture value currently set in camera 100 is depth priority setting (depth priority mode). Note that depth priority setting in this embodiment refers to a case where priority is given to the user's intention to set an arbitrary depth of field, 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 a configuration may be provided in advance as a setting item of camera 100 that can display both the T value and the F value, such as a setting item (second shooting condition) that corresponds to depth priority setting and that displays the F value preferentially.

[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, as opposed to the brightness-priority setting. In other words, the brightness-priority setting is a shooting condition that provides greater freedom in setting the depth of field than the brightness-priority setting. In contrast, the brightness-priority setting according to the present embodiment is a shooting condition that prioritizes the accuracy of exposure control relative to the brightness of the subject over adjusting the depth of field. In this embodiment, the brightness-priority setting applies to shooting conditions in which the user cannot arbitrarily set the depth of field. For example, when distinguishing by shooting mode, brightness-priority settings include auto mode and program mode, in which the camera automatically adjusts the exposure control values, and priority modes (such as TV-priority mode and SV-priority mode) in which the user prioritizes setting values ​​other than the aperture value. Depth-priority settings also include priority modes (Av-priority mode) in which the user can set an arbitrary aperture value, and manual mode in which the user can manually set all exposure control values.

[0092] In addition, as a shooting condition that offers more freedom in setting the depth of field than the brightness priority setting, specifically, a configuration is expected 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, the CPU 131 displays an arbitrary F-number in the aperture value display area of ​​the 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 the display unit 153 as a result of the processing in step S908 corresponds to the above-mentioned FIG. 8(b).

[0094] If it is determined that depth priority setting is not performed (NO in step S907), the process proceeds to step 909. For example, if 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 (AE, WB adjustment, etc.) 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 the content of the display (notification) regarding the aperture value can reduce any sense of discomfort felt by the user.

[0096] (Third embodiment) (Aperture value display processing during image playback) In the above-described embodiment, the display processing of the aperture value when capturing an image of a subject was described. In contrast to this, in the present embodiment, the display processing of the aperture value when playing back 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 playing back image data acquired by an imaging device capable of displaying (reporting) both the T-number and the F-number will be described.

[0097] Note that the configurations and basic driving methods of camera 100, which is an imaging device according to this embodiment, and lens unit 200, which is a camera accessory, are substantially the same as those of the first embodiment described above, and therefore the same reference numerals are used for the respective components, and their descriptions will be omitted. Furthermore, in this embodiment, a case where image data is played back and displayed on camera 100 will be described as an example, but the aperture value display process during image playback described below can also be applied when image data is played back and displayed on an electronic device other than camera 100. For example, the aperture value display process during image playback described below can also be applied when image data acquired by an imaging device is played back on an external electronic device (such as a PC) that can read the data using various methods.

[0098] FIG. 10 is a flowchart showing aperture value display processing during image playback according to a third embodiment of the present invention. As shown in FIG. 10, in response to an instruction to play back any image data in camera 100, CPU 131 loads the content of the image data recorded in recording medium 173 into memory 132 in step S1001. Once loading is complete, the process proceeds to step S1002. Note that if no readable image data is recorded in recording medium 173, the currently executed aperture value display processing during playback ends. Here, in this embodiment, it is assumed that, in the processing of step S1001, image data obtained under shooting conditions when capturing an image of a subject as shown in FIG. 11(a) is recorded on 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 content. Then, based on the determination result, CPU 131 determines whether the content type is a moving image. Note that in this embodiment, content refers to file format, codec, etc., and can determine, for example, whether image data is a still image or a moving image.

[0100] If it is determined that the previously read image data 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 so 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 illustrating an example of a display on the display unit in accordance with the aperture value display process when reproducing image data according to the present invention. The respective figures corresponding to Fig. 11 will be described later. Fig. 11(e) is an example of a display displayed on the display unit 153 in accordance with 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 content.

[0102] Next, if it is determined that the previously read image data is a moving image (YES in step S1002), in step S1005 CPU 131 determines whether the previously read content is a moving image (MP4 moving image) that is incompatible with T values ​​as a metadata standard. Note that in this embodiment, MP4 is used as an example of a file format for moving images that is one of the metadata standards and is incompatible with display of T values, but file formats that are incompatible with display of T values ​​are 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 a 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 related to 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 related to 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 an example of a display displayed on the display unit 153 by the processing in step S1007. As shown 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 process proceeds to the determination in step S1008, 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 values ​​and F values ​​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 imaged 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 imaged is used for image display based on the conversion table and information related to the F value included in the content data that was previously read.

[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 the corresponding T value based on the T value / F value conversion table and information about the F value obtained by analyzing the content data expanded in the memory 132. 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, and therefore description thereof will be omitted.

[0107] Next, in step S1011, CPU 131 issues a display instruction to display control unit 151, causing the F-number determined in the processing of step S1008 and the T-number calculated in step S1010 to be displayed together in the aperture value display area of ​​display unit 153. Fig. 11(c) is an example of a display displayed on display unit 153 by the processing 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. While the display method for the T value relative to the F value is not limited to this, in this embodiment, the display method for the T value on the display unit 153 is different depending on whether the T value is calculated based on the T value / F value conversion table or 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 shown in FIG. 11(d), which will be described later, than in the display example shown in FIG. 11(c). The calculation method for the T value corresponding to the display example shown in FIG. 11(d) will be described later.

[0109] Furthermore, in this embodiment, the case where image data is reproduced by the camera 100 has been described as an example, but if an external electronic device can use the T value / F value conversion table, the process of steps S1010 to S1011 may also be performed.

[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 the F-number obtained in the processing of step S1008 is a value near the maximum aperture. Here, as described in the first embodiment, for example, in lens unit 200, there are cases where the change in T-number is not 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 equation (1). Note that in this embodiment, the range of F-numbers that is two stops smaller than the maximum aperture of the aperture is defined as a value near the maximum 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, similar to step S1011 described above, CPU 131 displays the F-number and T-number together in the aperture value display area of ​​display unit 153. That is, in step S1014, CPU 131 displays the T-number calculated based on equation (1) in parentheses following the F-number, as shown in FIG.

[0113] On the other hand, if it is determined that the F-number 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-number calculated in step S1008 and the T-number calculated in step S1012. FIG. 11(d) is an example of a display displayed on the display unit 153 by the processing of step S1015. As shown in FIG. 11(d), an icon 1104 indicating the F-number and T-number is displayed in the aperture value display area together with icons indicating other content.

[0114] As described above, when the processing of step S1015 is performed, the F-number at the time of shooting corresponds to near full aperture, and therefore the accuracy of the T-value calculated in step S1012 is low compared to the F-number obtained in step S1008. Therefore, in this embodiment, the method of displaying the T-value in the processing of step S1015 differs from the processing of steps S1011, S1014, etc., and the T-value is displayed in gray. In other words, the display of the T-value in step S1015 is a reference value, and to notify the user of this, the method of displaying the T-value is different from other cases. This completes the aperture value display processing when playing back image data in this embodiment.

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

[0116] While preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments and various modifications and variations are possible within the spirit and scope of the present invention. For example, in the above-described embodiment, a configuration in which the lens unit 200 includes the APD filter 202 has been described, 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 include the aforementioned terminal group, and the camera 100 may read conversion information between the T-number and the F-number 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 it is possible to vary the light transmittance in the radial direction relative to the optical axis.

[0118] Furthermore, 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-described embodiment, the various components constituting the imaging system cooperate with each other, centering on the CPU 131, to control the operation of the entire device. However, this is not limiting. For example, a (computer) program conforming to the flow illustrated in each of the above-described figures may be stored in advance in the nonvolatile memory 133 of the camera 100. The CPU 131 or the like may then execute the program to control the operation of the entire imaging system. Furthermore, any form of program may be used, as long as it has the functionality of a program, such as object code, a program executed by an interpreter, or script data supplied to an OS. Furthermore, the recording medium for supplying the program may be, for example, a magnetic recording medium such as a hard disk or magnetic tape, or an optical / magneto-optical recording medium.

[0120] In the above-described embodiment, a digital camera has been described as an example of an imaging device embodying the present invention, but the present invention is not limited to this. For example, various imaging devices may be used, such as portable devices such as digital video cameras and smartphones, wearable devices, and security cameras. Furthermore, as described above, the aperture value display process during playback of image data 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 supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program.The present invention can also be realized by a circuit (e.g., ASIC) that realizes 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 for reproducing and displaying moving image data obtained by an imaging device capable of changing the aperture value; means for acquiring information about an F-number stored in the video data; a calculation means for calculating information about a corresponding T value from the information about the F value, The electronic device is characterized in that the display means displays information about the T value when the moving image data is played back.

Images