Imaging apparatus, method of controlling imaging apparatus, and program

Abstract

The present application provides a display that is easier to focus on, for example, during a rehearsal. An imaging apparatus includes a focal distance display control unit that performs control to display, on a display unit, a current focal distance indicating a position that is currently in focus and a plurality of focal distances at the time of previous shooting indicating positions that were in focus at the time of previous shooting and displayed in order of focus.

Description

Technical Field

[0001] This disclosure relates to imaging apparatus, methods and procedures for controlling imaging apparatus. Background Technology

[0002] Patent Document 1 discloses a technique for displaying rehearsal images. Furthermore, Patent Document 2 discloses a technique for displaying marks (symbols) on a focus bar. These techniques make it possible to perform shooting with a focal length and angle similar to that used during rehearsal.

[0003] Citation List

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-281358

[0006] Patent Document 2: Japanese Patent Application Publication No. 2001-326834 Summary of the Invention

[0007] The problem to be solved by the present invention

[0008] However, the technology described in the aforementioned patent documents cannot provide a more user-friendly display of focus during rehearsals.

[0009] One object of this disclosure is to provide an imaging device, a method and procedure for controlling the imaging device, for performing a more user-friendly display of focus during rehearsals.

[0010] Solution to the problem

[0011] For example, this disclosure is

[0012] An imaging apparatus includes a focal length display control unit that performs control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-shooting times, the plurality of focal lengths at pre-shooting times indicating focal lengths recorded at pre-shooting times and displayed in the order registered at pre-shooting times.

[0013] Furthermore, for example, this disclosure is

[0014] A method for controlling an imaging device, wherein a focal length display control unit performs control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-capture times, the plurality of focal lengths at pre-capture times indicating focal lengths recorded at pre-capture times and displayed in the order registered at pre-capture times.

[0015] Furthermore, for example, this disclosure is

[0016] A program for causing a computer to perform a method of controlling an imaging device, wherein a focal length display control unit performs control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-shooting times, the plurality of focal lengths at pre-shooting times indicating focal lengths recorded at pre-shooting times and displayed in the order registered at pre-shooting times. Attached Figure Description

[0017] Figure 1 This is a block diagram used to explain an example configuration of an imaging apparatus according to an embodiment.

[0018] Figure 2 It is a flowchart used to explain the workflow performed by the user during the preparation for shooting.

[0019] Figure 3 This is a flowchart used to explain an example of the processing performed by the imaging device during the preparation for shooting.

[0020] Figure 4 It is a flowchart used to explain the workflow performed by the user during subsequent shooting.

[0021] Figure 5 This is a flowchart used to explain an example of the processing that displays the current focal length, etc.

[0022] Figure 6 This is a diagram to refer to when describing the first example of how the current focal length and the focal length are displayed when preparing to shoot.

[0023] Figure 7 This is a diagram to refer to when describing the first example of how the current focal length and the focal length are displayed when preparing to shoot.

[0024] Figure 8 This is a diagram to refer to when describing the second example of how the current focal length and the focal length when preparing to shoot are displayed.

[0025] Figure 9 This is a diagram to refer to when describing the second example of how the current focal length and the focal length when preparing to shoot are displayed.

[0026] Figure 10 Figures A and 10B are referenced in the third example describing the display method of the current focal length and the focal length when preparing to shoot.

[0027] Figure 11 This is the diagram to refer to when describing the fourth example of how the current focal length and the focal length when preparing to shoot are displayed.

[0028] Figure 12 This is the diagram to refer to when describing the fifth example of how to display the current focal length and the focal length when preparing to shoot.

[0029] Figure 13 This is the diagram to refer to when describing the fifth example of how to display the current focal length and the focal length when preparing to shoot.

[0030] Figure 14 Figures A and 14B are the sixth example of how to display the current focal length and the focal length when preparing to shoot.

[0031] Figure 15 This is the diagram to refer to when describing the seventh example of how to display the current focal length and the focal length when preparing to shoot.

[0032] Figure 16 This is the diagram to refer to when describing the display method of the current focal length and the focal length when preparing to shoot.

[0033] Figure 17 This is the diagram to refer to when describing the ninth example of the display method for the current focal length and the focal length when preparing to shoot.

[0034] Figure 18 This is a flowchart illustrating the process of automatic focus switching control.

[0035] Figure 19 This is a flowchart illustrating the process executed in response to a manual focus control switching operation.

[0036] Figure 20 This is a diagram used to explain the modifications.

[0037] Figure 21 This is a diagram used to explain the modifications.

[0038] Figure 22 This is a diagram used to explain the modifications. Detailed Implementation

[0039] In the following description, embodiments of the present disclosure, etc., will be described with reference to the accompanying drawings. Note that the description will be given in the following order.

[0040] <Overview of this disclosure>

[0041] <An Example>

[0042] <Edit>

[0043] The embodiments described below are preferred specific examples of the present invention, and the content of this disclosure is not limited to these embodiments.

[0044] <Overview of this disclosure>

[0045] First, to facilitate understanding of this disclosure, an overview of the disclosure will be described. Generally, in the production of movies or television series, rehearsal shooting is performed before the actual shooting. If the focal length used during rehearsal can be used in the actual shooting, then a video substantially similar to the video used during rehearsal can be obtained in the actual shooting. Therefore, for example, a current focal length indicating the current focal length and multiple focal lengths used during pre-shooting are displayed on a display unit, the multiple focal lengths used during pre-shooting indicating the focal lengths recorded during pre-shooting and displayed in the order registered during pre-shooting. It should be noted that, in addition to information about how much the lens is driven, the focal length can also be described in detail by various methods such as methods for detecting the position of the lens, and can also be referred to as the focal point position.

[0046] Furthermore, in news photography, although detailed rehearsals are not performed as often as in theatrical filming, there is a manual operation involving pre-checking the focus by pointing the camera at the subject before the actual shot. In this case, the image of the subject as the point of focus and the current focal length are recorded in the camera body during the pre-focusing check, and the focal length and the image at that focal length are displayed in the viewfinder during the actual shot. Therefore, the photographer can easily perform focusing with the focal length and image as the target.

[0047] As described above, for example, this disclosure displays on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-shooting times, the plurality of focal lengths at pre-shooting times indicating focal lengths recorded at the pre-shooting time and displayed in the order registered at the pre-shooting time. Embodiments of this disclosure will be described in detail below.

[0048] <An Example>

[0049] [Imaging device configuration example]

[0050] First, refer to Figure 1 An example configuration of an imaging apparatus (imaging apparatus 1) according to an embodiment is described. Imaging apparatus 1 includes an optical system 101, an imaging element 102, a signal processing unit 103, a recording unit 104, a control unit 105, a driving unit 106, a recognition unit 107, a display unit 108, an output unit 109, and an operation unit 110. Control unit 105 includes a focus detection unit 105A, a focus display control unit 105B, a focus control unit 105C, and a display control unit 105D as functional blocks.

[0051] The optical system 101 includes an imaging lens for focusing light from a subject onto an imaging element 102. Generally, the optical system 101 has multiple lenses, such as an incident lens, a zoom lens, a focusing lens, and a condenser lens.

[0052] Imaging element 102 includes an imaging element that performs photoelectric conversion on incident light from the subject obtained through optical system 100, converts the light into electrical charge, and outputs an imaging signal, as well as an image signal processing unit that performs known image processing for correcting gain or brightness. As the imaging element, charge-coupled devices (CCDs), complementary metal-oxide-semiconductor (CMOS), etc., are used.

[0053] The signal processing unit 103 performs sample-and-hold operations to maintain a good signal-to-noise (S / N) ratio by performing correlation double sampling (CDS) processing, automatic gain control (AGC) processing, analog-to-digital (A / D) conversion, etc. on the imaging signal output from the imaging element 102, and generates an image signal.

[0054] Recording unit 104 is a storage medium such as a hard disk or flash memory. Video data recorded in recording unit 104 is stored in a compressed or uncompressed state based on a predetermined standard. Control of recording in recording unit 104 and control of reading from recording unit 104 are performed by control unit 105. Recording unit 104 records captured video data, the focal length at the time of pre-shooting (described later), and information related to the focal length at the time of pre-shooting, including at least one of a thumbnail image corresponding to the focal length at the time of pre-shooting or the time required for focal length transition.

[0055] The control unit 105 controls the imaging device 1 as a whole. The focus detection unit 105A detects the focal length. The focal length can be detected based on a signal indicating how much the lens is driven by the focus control unit 105C, based on the lens position, or based on edge detection information or depth information. Furthermore, the focal length can be detected for each frame, or it can be detected if the position of the lens included in the optical system 101 is detected to have moved.

[0056] The focal length display control unit 105B performs control to display on the display unit 108 the current focal length indicating the current focal length and a plurality of focal lengths at the time of preparation for shooting, the plurality of focal lengths at the time of preparation for shooting indicating the focal lengths recorded at the time of preparation for shooting and displayed in the order registered at the time of preparation for shooting.

[0057] The focus control unit 105C generates focus control data for performing focus control. The focus control unit 105C generates control data when operating autofocus, or when performing manual focus control based on user operation when the user performs focus-related operations on the operation unit 110.

[0058] The display control unit 105D performs control to display on the display unit 108 image signals processed by the signal processing unit 103, video data recorded in the recording unit 104, etc.

[0059] The drive unit 106 acquires focus control data by communicating with the control unit 105, and performs autofocus by moving the lens by a predetermined amount along the optical axis based on the focus control data to focus on the target subject. Furthermore, according to the control from the control unit 105, the operation of the drive mechanism, shutter mechanism, aperture mechanism, etc., of the optical system 101 is controlled. Therefore, the exposure time (shutter speed) and the aperture value (F-number) are adjusted.

[0060] The recognition unit 107 performs subject recognition based on the image signal processed by the signal processing unit 103. For example, as a result of the subject recognition by the recognition unit 107, the recognized subject is associated with the focal length obtained when the subject is focused.

[0061] Display unit 108 is a display device such as a monitor that displays a live view image as an image signal processed for display, an image / video processed for recording and storage in recording unit 104, a graphical user interface (GUI), etc.

[0062] Output unit 109 is an interface to another device, the Internet, etc. Output unit 109 may include a wired or wireless communication interface. Furthermore, more specifically, the wired or wireless communication interface may include cellular communication such as 3TTE, Wi-Fi, Bluetooth (registered trademark), Near Field Communication (NFC), Ethernet (registered trademark), High Definition Multimedia Interface (HDMI) (registered trademark), Universal Serial Bus (USB), etc.

[0063] Note that the imaging device 1 may include a communication unit capable of connecting to the Internet, other devices, such as wireless local area networks (LANs), wide area networks (WANs), or wireless fidelity (WiFi). Furthermore, communication between the imaging device 1 and external devices may be short-range wireless communication, such as near-field communication (NFC) or ZigBee (registered trademark), or tethering connections (such as WiFi tethering, Universal Serial Bus (USB) tethering, or Bluetooth tethering).

[0064] The user uses the operation unit 110 to give various commands to the imaging device 1, for example. When an operation input is given to the operation unit 110 by the user, a control signal corresponding to the operation input is generated and supplied to the control unit 105. The control unit 105 then performs various processes corresponding to the control signal. Examples of the operation unit 110 include a shutter button for shutter input, physical buttons for various operations, a touch panel, a touchscreen integrated with a display unit 108, a microphone for receiving voice input, etc. Furthermore, the operation unit 110 includes a focus ring for manual focusing. Note that manual focusing can be set via a touch panel or button-type operation mechanism.

[0065] Although an example configuration of imaging device 1 has been described above, the configuration of imaging device 1 can be appropriately modified. For example, imaging device 1 may include a sensor for acquiring depth information, or it may include a communication unit for communicating with another device.

[0066] [Operational Example of Imaging Device]

[0067] (Example of operations during pre-shooting)

[0068] Next, an operational example of the imaging device 1 will be described. First, refer to... Figure 2 The flowchart shown illustrates an example of the operation of imaging device 1 during pre-shooting. Pre-shooting can be a rehearsal shot, or a shot performed before a rehearsal shot. Figure 2 The flowchart shown is, for example, a workflow performed by a focuser responsible for focusing.

[0069] In step ST11, the viewpoint and the subject to be photographed are determined. Then, the process proceeds to step ST12.

[0070] In step ST12, the most suitable focal length is determined. For example, the focusing ring of imaging device 1 is operated appropriately, and the focal length is determined while making fine adjustments. Then, the process proceeds to step ST13.

[0071] In step ST13, an operation is performed to pre-register the optimal focal length and the image corresponding to that focal length in the imaging device 1. This operation is triggered by a trigger. The operation is triggered by actions such as pressing an assignable switch, voice input, etc. The registered focal length is the focal length at which the image is to be taken.

[0072] In step ST14, the time corresponding to the focal length at the time of preparation for shooting is determined and recorded. For example, such time is the time elapsed since the start of storage timing. For example, the time corresponding to the focal length at the time of preparation for shooting is stored in the recording unit 104 in association with the image data corresponding to the focal length at the time of preparation for shooting.

[0073] Note that multiple pre-shoot focal lengths can be set. In this case, the above process is repeated for the number of pre-shoot focal lengths. In the following description, unless otherwise stated, it is assumed that three pre-shoot focal lengths are set (pre-shoot focal length A, pre-shoot focal length B, and pre-shoot focal length C).

[0074] Figure 3 This is a flowchart illustrating the specific processing flow performed by the imaging device 1 in response to the above-described operation.

[0075] In step ST21, the control unit 105 determines whether the imaging device 1 is in focal length recording mode. If the imaging device 1 is not in focal length recording mode, step ST21 is repeated. If the imaging device 1 is in focal length recording mode, the process proceeds to step ST22.

[0076] In step ST22, the focus detection unit 105A detects the focal length. Focal length detection can be performed for each frame, can be performed when a change in the position of a lens included in the optical system 101 is detected, or can be performed at other time intervals. Then, processing proceeds to step ST23.

[0077] In step ST23, it is determined whether a user operation exists. Such a user operation is an operation for recording the focal length. For example, control unit 105 determines whether a user operation exists based on the presence or absence of an operation signal from operation unit 110. If no user operation exists, the process returns to step ST23. If a user operation exists, the process proceeds to step ST24.

[0078] In step ST24, the focal length detected in step ST22 is saved as the focal length for the pre-shooting phase. Specifically, the control unit 105 records the focal length detected by the focus detection unit 105A in the recording unit 104 as the focal length for the pre-shooting phase. Then, the process proceeds to step ST25.

[0079] In step ST25, the control unit 105 determines whether the process has ended. For example, it determines that the process has ended when the power to the imaging device 1 is turned off or the focal length recording mode is ended. If it is determined that the process has ended, the entire process ends. If it is determined that the process has not ended, the process returns to step ST22.

[0080] (Examples of operations during subsequent shooting)

[0081] Next, we will refer to Figure 4 The flowchart shown illustrates an example of the operation of imaging device 1 in subsequent shooting. Subsequent shooting is shooting performed after the pre-shooting, and specific examples include actual shooting and rehearsal shooting. Figure 4 The flowchart shown is also a workflow performed, for example, by a focuser responsible for focusing.

[0082] In step ST31, the user operation to record the video is performed. Then, the process proceeds to step ST32.

[0083] In step ST32, the current focal length and the focal length at the time of shooting are displayed on the display unit 108. The user performs a focusing operation to match the current focal length with the focal length at the time of shooting. Then, the process proceeds to step ST33.

[0084] In step ST33, it is determined whether the shooting has ended. If the shooting has not ended, the process returns to step ST32. If the shooting has ended, the process proceeds to step ST34.

[0085] In step ST34, the user stops the video recording process.

[0086] (Example of operations to display current focal length, etc.)

[0087] Next, we will refer to Figure 5 The flowchart describes an example of operation in imaging device 1 where the current focal length, etc., is displayed. For example, when a display mode for displaying the current focal length, etc., is set, the current focal length, etc., is displayed.

[0088] In step ST41, the process of reading the saved focal length at the time of preparation for shooting is performed. For example, the focal length display control unit 105B reads the focal length at the time of preparation for shooting from the recording unit 104. In addition, the focal length display control unit 105B obtains the current focal length from the focus detection unit 105A. Then, the process proceeds to step ST42.

[0089] In step ST42, the focus display control unit 105B performs control to display information including the current focus length and the focus length at the time of shooting on the display unit 108. Then, the process ends.

[0090] [Specific examples of how to display the current focal length and the focal length at the time of shooting]

[0091] (First example)

[0092] Next, a specific example of the display method for the current focal length and the focal length at the time of shooting will be described. The display methods for the current focal length and the focal length at the time of shooting include multiple display methods, and the focal length display control unit 105B selects at least one of these multiple display methods. Then, the focal length display control unit 105B executes control to implement the selected display method. Note that the focal length display control unit 105B can execute control to implement a display method obtained by combining multiple display methods.

[0093] In the first example, such as Figure 6 As shown in the diagram, the scenario where user (photographer) U changes the focal length from subject HA to subject HB and then to subject HC from the same perspective is considered an example. The focal length corresponding to subject HA is the pre-shooting focal length A, the focal length corresponding to subject HB is the pre-shooting focal length B, and the focal length corresponding to subject HC is the pre-shooting focal length C.

[0094] Figure 7 This is an example diagram illustrating the information displayed on display unit 108 in the first example. In the lower part (AR) of the display unit 108 near the center, the currently captured video (image) is displayed. Furthermore, a focus bar (FB) is displayed on the upper side of display unit 108, and below the focus bar (FB) is a rehearsal video (RV) captured during the pre-shoot (in this example, a rehearsal shoot).

[0095] The focus bar FB indicates the focal length and is a rectangular bar extending in the horizontal direction of the display unit 108. The focus bar FB can be a rectangular bar extending in the vertical direction of the display unit 108, or it can have a shape other than a rectangle. Above the focus bar FB, black triangles indicating the prepared shooting focal lengths A, B, and C are displayed along with order information indicating the order of the focal lengths at the time of shooting. The information indicating the order of the focal lengths can be numbers instead of letters. Furthermore, a mark 11 indicating the current focal length corresponding to the current focal length obtained by the focus detection unit 105A is displayed in the focus bar FB. According to this example, the mark 11 is, for example, a black line extending in the vertical direction, but it can also be displayed in another manner.

[0096] Furthermore, above the focus bar FB, transition information 12 is displayed. In this example, transition information 12 is indicated, for example, by a black triangle, but another display mode is also possible. Transition information 12 indicates the change in focal length during rehearsal shooting and moves on the focus bar FB. There are cases where transition information 12 moves to the right on the focus bar FB, and there are cases where transition information 12 moves to the left on the focus bar FB. Note that, for example, transition information can be displayed by recording the focal length associated with each frame of the image obtained during pre-shooting and reading the focal length associated with each frame when reproducing the image obtained during pre-shooting.

[0097] When actual filming begins, the video being filmed is displayed in area AR of display unit 108. Furthermore, the video data obtained during rehearsal filming is reproduced from recording unit 104 by control unit 105. Additionally, the focal length for each frame of the video data obtained during rehearsal filming is supplied to focal length display control unit 105B. Focal length display control unit 105B displays the focal length in the upper part of focus bar FB, while simultaneously adjusting the display position of transition information 12 based on this focus position for each frame.

[0098] Furthermore, the video data captured during rehearsal shooting is temporarily adjusted by the control unit 105 and then displayed as the rehearsal video RV by the display control unit 105D on the display unit 108. Additionally, the focal length display control unit 105B reads images corresponding to focal lengths A, B, and C at the pre-shooting stage from the recording unit 104. For example, the focal length display control unit 105B displays thumbnails SA, SB, and SC at predetermined positions of the images corresponding to focal lengths A, B, and C at the pre-shooting stage, based on the time associated with those images. An arrow 13 indicating the reproduction position is displayed above the rehearsal video RV.

[0099] Note that since knowing the total video recording time from the rehearsal video RV is sufficient, the video between thumbnail images can be sparsified and displayed, or, if the recording time of the rehearsal video RV is very long, the middle part can be omitted and hidden.

[0100] The rehearsal video RV is reproduced simultaneously with the start of the recording. User U adjusts the focus position so that the marker 11 indicating the current focus length matches the transition information 12.

[0101] Note that the focus can be temporarily stopped at the focal length during each pre-shoot. In the case of producing films or television series, there are many cases where recording begins before the performance starts, based on the director's instructions (e.g., "action" instructions), rather than the time from the start of recording to the focal length. Therefore, a block that can be provided inside the imaging device 1 to detect the start of the performance via the director's voice instructions can be provided, and the start point of the video can be adjusted between rehearsals and actual shooting based on the start of the performance.

[0102] As in this example, by displaying the transformation information 12, a similar focal length change as during the pre-shooting phase can be reproduced in the actual shooting.

[0103] (Second example)

[0104] Next, a second example will be described. The second example is an example of a display method considering the use case of shooting in news reporting. In shooting news reports, instead of performing detailed rehearsals before the actual shooting, the photographic operation is checked in advance before the actual shooting. The image of the subject as the point to be shot and the focal length at that time are recorded in the memory of the main body of the imaging device 1. Unlike the first example, since the time from the focal length at the start of recording to the recorded focal length and the time interval between each focal length are not specifically determined, the menu screen of the imaging device 1, etc., is used as a guide setting for shooting and recorded in the recording unit 104. The focal length for the pre-registered shooting and the corresponding image are displayed on the timeline before the actual shooting, and for example, the photographer performs focusing by operating the focus ring guided by the focal length at the pre-shooting, and keeps the current focal length consistent with the focal length at the pre-shooting.

[0105] The description will use a reporter's on-site report as an example. For example... Figure 8 As shown, user U first adjusts the viewpoint to reporter HD, then to house 20A in front, and then to house 20B in the back. Before actually shooting, user U uses the menu or assignable buttons to register the focal lengths A, B, and C in association with the viewpoint as the target positions for stopping the focusing operation.

[0106] Subsequently, the control unit 105 acquires the time corresponding to the focal length at each pre-shooting position and registers it in association with the focal length at the pre-shooting position. For example, the time is acquired based on a counter included in the control unit 105. The user U moves the current focus position to match the movement of the focal length at the pre-shooting position and stops the focusing operation at the focal length at each pre-shooting position.

[0107] Figure 9 This is an example of the information displayed on display unit 108 in the second example. Although it is basically similar to the first example, in the case of news reporting, the rehearsal video RV is not displayed, but only thumbnail images SA, SB, and SC corresponding to the focal length at the corresponding pre-shooting position are displayed.

[0108] [Third Example]

[0109] This example illustrates a method for displaying a thumbnail image alongside a focus bar (FB). There are situations where, due to the image being too small or the focus difference being minimal, it's impossible to definitively determine whether the focus is on a frontal or rear subject solely from the thumbnail image. Therefore, to display the focused subject or portion in an easily understandable manner, the thumbnail image undergoes processing to emphasize the focused subject or portion by highlighting its outline, while strongly blurring out out-of-focus objects and portions. Furthermore, processing is performed on the focused subject by preserving or adding color through color peaking, and on reducing the hue of the out-of-focus subject to approach or completely black and white. By performing these processes, even in a small thumbnail image, the user can easily identify the focused subject or portion.

[0110] For example, in a situation where there are two flowers, one on the front and one on the back, the flower on the front is focused at the pre-shooting focal length A, and the flower on the back is focused at the pre-shooting focal length B. In this case, for the thumbnail displayed in the actual shot, such as... Figure 10 As shown in Figure A, the frontal flower is emphasized in the thumbnail SA corresponding to the intended shooting focal length A, and as... Figure 10 As shown in B, the back of the flower is emphasized in the thumbnail SB corresponding to the intended shooting focal length B.

[0111] For example, Figure 10 The generation of the thumbnail images shown in A and 10B is performed by the display control unit 105D. Since the viewpoint and position of the subject in the video read from the recording unit 104 substantially match the viewpoint and position of the subject in the captured image, the display control unit 105D generates the thumbnail image after performing emphasis focusing or defocusing on the image data associated with the focal length in the rehearsal video RV. The generated thumbnail image is displayed along with the video being recorded.

[0112] [Fourth Example]

[0113] Next, a fourth example of the display method will be described. Depending on the aspect ratio of the effective image being imaged, there may be a case where the area outside the effective image is a black image when viewing the display image shown on the display unit 108. For example... Figure 11 As shown, the thumbnail image in the example above can be displayed in the black image area ARB. For example, when shooting a movie, there are cases where shooting is performed with an aspect ratio such as 2.4:1, and when using a 16:9 display unit 108, display is performed by inserting black images at the top and bottom in a widescreen (letterboxing). By displaying thumbnail images in the top and bottom black image areas, it is possible to display both the video and the thumbnail image in the effective area simultaneously.

[0114] When there are multiple focal lengths for each intended shot, the thumbnail image is easily associated with the image corresponding to each focal length. However, there may be cases where there is only one focal length, or where the thumbnail image is associated with the subject in the user's head and the thumbnail image is unnecessary. Given these situations, the thumbnail image can be hidden.

[0115] [Fifth Example]

[0116] Next, we will describe the fifth example of the display method. Figure 7 and 9 In the example shown, the display is performed below the focus bar FB (i.e., side-by-side in the vertical direction of the display unit 108). However, as... Figure 12 As shown, the display can also be performed on one side of the focus bar FB (i.e., side by side in the horizontal direction of the display unit 108).

[0117] When there is no black image area outside the effective video area (the area corresponding to area AR), a focus bar FB may be displayed within the effective video area. In this case, if the thumbnail image is placed below the focus bar FB, the video displayed in area AR becomes difficult to see. By placing the thumbnail image next to the focus bar FB, the area occupied by the focus bar FB and the thumbnail image can be reduced. Control related to this display is performed by the display control unit 105D.

[0118] In the case of theatrical or journalistic filming, it is also important to indicate the current shooting position relative to the entire recording time of the rehearsal video. In this case, the position can be displayed, for example, in an area smaller than the thumbnail image using markers or characters.

[0119] Furthermore, under the control of the display control unit 105D, the display mode of the thumbnail image can change according to the progression of the sequence of focal lengths to be adjusted during the pre-shooting phase. For example, after setting the current focal length to the pre-shooting focal length A at a set time, a thumbnail SB corresponding to the next pre-shooting focal length B can be displayed to distinguish it from other thumbnail images. Specifically, as... Figure 13 As shown, the thumbnail image SB can be displayed surrounded by a box of a predetermined color (e.g., a red box). In this case, the thumbnail image SA, for which a focal length has been taken, can be surrounded and displayed by a box of another color (e.g., a green box). The colored boxes allow the user U to identify the order in which the focal lengths are adjusted. Thumbnails that have passed the next order can be deleted. When characters are displayed in the center of the thumbnail image, the characters can be displayed semi-transparently because the subject in the image needs to be visually recognized.

[0120] Note that in the absence of a black image area, a thumbnail image can be displayed as a picture-in-picture image within the valid area.

[0121] [Sixth Example]

[0122] Next, a sixth example of the display method will be described. This example pertains to a display method for the focus bar FB. When the difference between the mark 11, representing the current focal length, and the focal length at the time of shooting is equal to or less than a threshold, the portion of the focus bar FB including mark 11 can be magnified and displayed. The determination of whether the difference is equal to or less than the threshold, as well as the magnification and display, are performed by the focal length display control unit 105B. Some display controls may be performed by the display control unit 105D.

[0123] For example, such as Figure 14 As shown in A, mark 11 is close to focal length B. When the difference between mark 11 and the focal length B at the time of shooting is equal to or less than a threshold, the portion including mark 11 and focal length B can be magnified and as shown... Figure 14 As shown in Figure B. Note that, for example, the focus display control unit 105B obtains the difference between mark 11 and the focus B at the time of preparation for shooting based on the time corresponding to mark 11 (e.g., the time from the start of recording) and the elapsed time when the focus B at the time of preparation for shooting, and determines whether the obtained difference is equal to or less than a threshold. The display method according to this example makes it easy to perform fine-tuning of the focus when the current focus is close to the predetermined focus at the time of preparation for shooting.

[0124] [Seventh Example]

[0125] Next, we will describe the seventh example of the display method. Figure 15 This is a diagram illustrating the display mode according to this example. For example... Figure 15 As shown, displaying thumbnail images is not required. Without displaying thumbnail images, since the subjects corresponding to the focal lengths at each pre-shooting time are unknown, the subjects HA1, HB1, and HC1, which were focused at the corresponding focal lengths during pre-shooting, are enclosed in rectangular frames, allowing the positions of the subjects at each pre-shooting focal length to be known based on the rehearsal video RV. In this case, subjects HA1, HB1, and HC1, which were focused at the corresponding pre-shooting focal lengths during pre-shooting, are recorded in association with the pre-shooting focal lengths. The way subjects HA1, HB1, and HC1 are indicated allows the rehearsal video RV to become semi-transparent and be displayed overlaid on the currently captured image. Furthermore, as... Figure 15As shown, among the currently captured subjects HA1, HB1, and HC1, the subject in focus can be emphasized. For example, processing can be performed to display the outline of the subject in focus in an emphasized manner or to blur parts of the image other than the subject in focus. For example, this processing is performed by the display control unit 105D.

[0126] In addition, such as Figure 15 As shown, (1), (2) and (3) can be displayed near the corresponding focal length when preparing to shoot in the focus bar FB, so that the shooting order can be known.

[0127] Furthermore, the time required for focal length change can be displayed. This focal length change time is the time required for the focus position to move from the focal length registered at the first pre-shooting time (a first pre-shooting time) to the focal length registered at the second pre-shooting time (a second pre-shooting time), which is later than the first time. For example, the focal length change time 31, measured when the focal length changes from focal length A to focal length B, is displayed on the display unit 108. Figure 15 In the example shown, two seconds are displayed to the right of the focus bar FB as the time 31 required for the focus change. With this display, when the current focus position is at focus A, the user U can know the quantized time it takes for the focus position to move to focus B. Note that in this example, the first timing (e.g., the time elapsed since the start of the first pre-shoot) for recording the focus at the first pre-shoot is recorded in association with the focus at the first pre-shoot. This applies similarly to the second timing. For example, the focus display control unit 105B calculates the time between the first and second timings and displays the result as the time 31 required for the focus change.

[0128] In addition, it can display the time 32 measured from the start of shooting to the transition to each pre-shooting position. Figure 15 In the example shown, the time 32 for the focal length change to each pre-shooting shot is shown as 3 to 6 seconds for the focal length change to pre-shooting shot A, 8 to 15 seconds for the focal length change to pre-shooting shot B, and 20 to 30 seconds for the focal length change to pre-shooting shot C.

[0129] [Eighth Example]

[0130] Next, we will describe the eighth example of the display method. Figure 16 This is a diagram illustrating the display mode according to this example. In this example, the focal length is displayed not only in the focus bar FB but also in the curve graph.

[0131] like Figure 16 As shown, for example, graph G is a graph where the vertical axis represents the focal position and the horizontal axis represents time. (Compared to...) Figure 15Unlike other methods, the rate of change of focal length is represented by the gradient (tilt angle) of curve G. On the curve G, for example, two circular markers 41 and 42 are displayed as the focal length moves along the curve G. Marker 41 corresponds to marker 11, while marker 42 corresponds to the current focal length. The user U simply needs to adjust the focus so that marker 41 matches marker 42. At this point, only the speed of focus movement needs to be adjusted according to the gradient of curve G. For example, curve G is largely superimposed on the currently photographed subject.

[0132] [Ninth Example]

[0133] Next, we will describe the ninth example of the display method. Figure 17 This is a diagram illustrating the display mode according to this example. In this example, the focus bar FB is not displayed; instead, thumbnail images SA to SB corresponding to the respective focal lengths at the time of the pre-shooting shot are displayed.

[0134] Figure 17 The rectangular frames surrounding subjects HA1, HB1, and HC1 in the illustration indicate the subjects at the focal length required for shooting. However, in this example, since thumbnail images SA to SC are displayed, the frames surrounding each subject can be hidden.

[0135] In this embodiment, above each thumbnail image, there is a number indicating the sequence of focal lengths at the time of preparation for shooting, and the numerically indicated focal length at that time. By indicating the numerical focal length at the time of preparation for shooting, the user U can know how much the current focal length needs to be moved quantitatively to adjust to the next focal length at the time of preparation for shooting. Figure 17 In the example shown, with Figure 15 The example shown is similar, showing the time 31 required for focal length change and the time 32 from the start of shooting to the focal length at each pre-shooting position.

[0136] Display elements from the above-mentioned various display methods can be combined.

[0137] Note that the focus display control unit 105B can select one of the aforementioned display methods based on the shooting mode. For example, the shooting modes are shooting modes with different recording formats. Specifically, there are shooting modes for drama and film, and shooting modes for reportage and news. The former is generally recorded as RAW data (data recorded in RAW mode and uncompressed or with a compression rate equal to or less than a threshold), while the latter is compressed and recorded in an appropriate format.

[0138] Specific examples will be described. In the case of shooting movies or plays, it is common for a focuser to perform focusing operations. The monitor the focuser views is either a small monitor attached to the top of the imaging device 1 or a medium-sized monitor mounted on a movable tripod. Furthermore, there are cases where a rangefinder sensor is connected and its output is superimposed on the imaging image. As mentioned above, since there is insufficient screen area to display and visually identify the focal length and thumbnails, it is desirable to provide a menu that allows switching of the display according to the user U's preferences or by switching the display using a selectable switch. In view of the above, in the case where the shooting mode is for theatrical and film shooting, Figure 12 , 13 The display methods shown in 15, 16, and 17 are preferred. However, even in the case of shooting movies or TV series, where the monitor used for focusing operations can be a large screen, there are situations where it is possible to ensure that both the focal length and the thumbnail image at the time of shooting are displayed simultaneously. Therefore, in the case of shooting modes for dramas and movies, an alternative display method can be used.

[0139] On the other hand, in news reporting scenarios, the camera operator essentially operates the imaging device 1 and lenses entirely on their own. At this time, focusing is performed while viewing a small observer. Therefore, the monitor screen is likely to be small, and it is desirable to display or show a thumbnail image of the focal length during or in preparation for shooting, or to be able to temporarily hide the display. Furthermore, since the effective image area has an aspect ratio of 16:9 in many cases, it is difficult to... Figure 12 and 13 The image shown displays the focal length and thumbnail image during pre-shooting outside the effective video area. In light of the above, in shooting modes used for reporting and news, for example, employing... Figure 15 and 16 The method shown is to display images without thumbnails.

[0140] [Focus control switching]

[0141] While the above description assumes manual focusing is performed when the focus is adjusted to the intended focal length for shooting, it is also possible for autofocus to automatically cause movement. In situations such as theatrical filming, where it is desired that the focus movement in the actual shot perfectly matches the focus movement in the rehearsal shot, autofocus can be set in the focus settings via the menu screen or the assignment button, and the focus movement is performed automatically. Furthermore, focus control switching can be performed automatically.

[0142] Figure 18This is a flowchart illustrating the process flow of automatic focus control switching. For example, the focus control switching is performed by the control unit 105. Furthermore, it will be described assuming that the focus control is manual at the start of the process.

[0143] In step ST51, the control unit 105 acquires the current focal length obtained by the focus detection unit 105A. Then, the control unit 105 determines whether the absolute value of the difference between the current focal length and the focal length at the time of shooting is less than a threshold ThA. If the difference is greater than the threshold ThA (in the case of "No"), the process returns to step ST51, and the process of step ST51 is repeated. If the difference is less than the threshold ThA (in the case of "Yes"), the process proceeds to step ST52.

[0144] In step ST52, the focus control unit 105C switches the focus control from manual focus (MF) to autofocus (AF). Switching to autofocus is because, when the current focal length is close to the focal length intended for shooting, autofocus is more likely to adjust the focal length appropriately compared to manual focus. Then, the process proceeds to step ST53.

[0145] In step ST53, the control unit 105 determines whether there is an operation that switches the focus control to manual focus. Examples of such operations include pressing a dedicated switch for switching focus control and touching the focus ring (specifically, touching a sensor such as a touch sensor provided in the focus ring). If no operation occurs, the process returns to step ST53, and the determination process of step ST53 is repeated. If an operation occurs, the process proceeds to step ST54.

[0146] In step ST54, the focus control unit 105C switches the focus control from autofocus to manual focus. This process is repeated during pre-shooting activities such as actual shooting. For example, the process ends when the shooting is finished.

[0147] Figure 19 This is a flowchart illustrating the processing flow executed in response to a manual focus control switching operation. In step ST61, the control unit 105 determines whether an operation has occurred. For example, such an operation is the pressing of a dedicated switch. This operation could be an operation that prevents the focus ring from being touched for a predetermined time or longer. If the determination result is negative, the process returns to step ST61, and the determination process of step ST61 is repeated. If the determination result is positive, the process proceeds to step ST62.

[0148] In step ST62, the focus control unit 105C switches the focus control from manual focus to autofocus. Then, the process proceeds to step ST63.

[0149] In step ST63, the control unit 105 determines whether an operation exists. This operation is the same as the operation in step ST61 that determines whether an operation exists or not. If the determination result is negative, the process returns to step ST63 and repeats the determination process of step ST63. If the determination result is positive, the process proceeds to step ST64.

[0150] In step ST64, the focus control unit 105C switches the focus control from autofocus to manual focus. This process is repeated during pre-shooting activities such as actual shooting. For example, the process ends when the shooting is finished.

[0151] In the above process, by incorporating functions such as a touch sensor into the focus ring, manual focusing can be performed while touching the focus ring, and autofocus can be performed when the hand is released from the focus ring. Therefore, it achieves the advantage of eliminating the need for button operations using other fingers besides the focus ring.

[0152] [Effects obtained through this embodiment]

[0153] According to this embodiment, for example, the following effects can be obtained.

[0154] A more user-friendly display can be implemented for the focus area during rehearsals.

[0155] While autofocus performance has been improving recently, it remains difficult to achieve the desired focus solely through autofocus. This is especially true in film and theater production, where focus is a crucial element of video production and varies depending on the shooting scenario, such as slow or fast focusing on the subject. It's challenging to consistently incorporate the producer's intent into autofocus operations, or to achieve the same reproducibility and accuracy as during rehearsals. Furthermore, in recent years, shooting has increasingly relied on combinations of shallow depth-of-field lenses and cameras, or cameras equipped with high-resolution image sensors, regardless of the shooting workflow. On the other hand, the monitor attached to the camera for shooting is often a small monitor with a resolution lower than that of the image sensor, making it difficult for the photographer to check focus accuracy. However, according to this embodiment, for example, since multiple focal lengths and the current image can be checked simultaneously while shooting, it is possible to improve the reproducibility of focus operations when manually focusing, and to accurately adjust the current focal length to the focal length intended for shooting.

[0156] Furthermore, in this embodiment, for example, the focal length at the time of preparation for shooting and the image at that time are displayed simultaneously, and the image is displayed so that the focus position is easily known even using a small thumbnail image. Therefore, in the case where there are multiple focal lengths at the time of preparation for shooting, the focal length at the time of preparation for shooting can be easily associated with the subject or part of the subject.

[0157] Furthermore, in this embodiment, for example, since the focal length and the image at that time can be checked on the same monitor as the video being filmed, the user can easily focus.

[0158] <Edit>

[0159] Although one embodiment of the present disclosure has been specifically described above, the content of the present disclosure is not limited to the above embodiment, and various modifications based on the technical concept of the present disclosure are possible.

[0160] [First Revision]

[0161] In the above embodiments, the registration position of the focal length during pre-shooting and the order of the focal lengths during pre-shooting can be changed later. Figure 20 This is a flowchart illustrating the processing flow performed by the imaging device 1 in response to a later focus correction operation. For example, Figure 20 The processing shown is performed when the mode for correcting the focal length during pre-shooting is set.

[0162] In step ST71, the control unit 105 reads representative images (e.g., thumbnail images) corresponding to the focal lengths of multiple pre-shooting shots recorded in the recording unit 104. The display control unit 105D displays all the read images on the display unit 108. Then, the process proceeds to step ST72.

[0163] In step ST72, the display control unit 105D displays a representative image selected by the user U for fine correction on the display unit 108. Then, the process proceeds to step ST73.

[0164] In step ST73, the control unit 105 records the corrected representative image in the recording unit 104 in association with the focal length associated with the pre-shooting image before correction.

[0165] Figure 21This diagram illustrates a specific example of the above-described process. On the left side of display unit 108, a thumbnail image corresponding to the predetermined focal length during pre-shooting is displayed. This thumbnail image is an image focused on the nose. Furthermore, on the right side of display unit 108, the currently captured image is displayed. For example, when the user corrects the focal length A from the nose position 51 on the face to the eye position 52, the corrected focal length A' is recorded in recording unit 104.

[0166] [Second Revision]

[0167] It is also assumed that the position of the subject in the imaging device 1 currently filming a drama or film does not match the position of the subject in a pre-shoot, such as during rehearsal. By automatically detecting the shooting start timing command based on the clapperboard sound or video or the director's voice used at the start of filming, video synchronization of the subject is achieved between the rehearsal video and the currently filmed video. Furthermore, delay adjustments are performed on a frame-by-frame basis.

[0168] When the currently filmed video differs significantly from the rehearsal video due to changes in the performers' performance or the filming environment, the focal length will also change. In such cases, a warning display can be shown, such as adding color to the outer frame of the screen to cause flashing, so that the person filming is aware of the change in perspective and subject.

[0169] For example, such as Figure 22 As shown, the performer 61's position during rehearsal is position P1, and the performer 61's position during the current shooting is position P2. For example, the recognition unit 107 identifies each of positions P1 and P2 by performing subject recognition and sends the recognition result to the control unit 105. The control unit 105 may display a warning if it determines that positions P1 and P2 transmitted from the recognition unit 107 are separated by a threshold or greater.

[0170] Note that, since there may be instances where the photographer intentionally changes the shooting angle or subject compared to the rehearsal, a user interface can be provided to update the original rehearsal video after shooting. Furthermore, if a gyroscope sensor or Global Navigation Satellite System (GNSS) is mounted on imaging device 1, the shooting position and direction of imaging device 1 are known. Therefore, if recording is performed as metadata regarding the shooting position and direction during rehearsal shooting, the difference between the camera's shooting position and direction and the current shooting position and direction can be obtained. If the difference is large enough to reach a threshold or greater, a warning can be displayed.

[0171] Furthermore, a warning display may be displayed if the viewing angle of the imaging device 1 currently performing the shot does not match (by a predetermined value or more) the viewing angle during a pre-shoot, such as a rehearsal shot; or if the position of the subject and the viewing angle differ by a predetermined value or more. Additionally, a warning display may be displayed if the difference between the current focus position and the focal length is equal to or greater than a threshold.

[0172] [Other modifications]

[0173] The configuration of the imaging apparatus according to the above embodiments and modifications can be appropriately changed. Furthermore, the processing portion of the imaging apparatus can be performed by a server device in the cloud, etc.

[0174] The configurations, methods, steps, shapes, materials, and values ​​described in the above embodiments and modifications are merely examples. Different configurations, methods, steps, shapes, materials, and values ​​may be used as needed, and the above configurations, methods, steps, shapes, materials, and values ​​may be replaced with known configurations, methods, steps, shapes, materials, and values. Furthermore, the configurations, methods, steps, shapes, materials, and values ​​in the embodiments and modifications can be combined with each other without causing technical inconsistencies.

[0175] It should be noted that the contents of this disclosure should not be construed as being limited to the effects illustrated in this specification.

[0176] This disclosure can also be implemented using the following configurations. (1)

[0178] An imaging apparatus includes a focal length display control unit that performs control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-shooting times, the plurality of focal lengths at pre-shooting times indicating focal lengths recorded at pre-shooting times and displayed in the order registered at pre-shooting times. (2)

[0180] According to the imaging device in (1),

[0181] The display methods for the current focal length and the focal length at the time of shooting include multiple display methods, and the focal length display control unit selects at least one of the multiple display methods. (3)

[0183] According to the imaging device in (2),

[0184] The various display methods include displaying the current focal length and the focal lengths at the multiple pre-shooting times via a focus bar. (4)

[0186] According to the imaging device in (3),

[0187] The various display methods include a method of displaying multiple thumbnail images, each corresponding to a focal length at the time of the multiple pre-shooting shots, together with a focus bar. (5)

[0189] According to the imaging device in (4),

[0190] The display mode of the thumbnail images changes according to the progression of the sequence. (6)

[0192] According to the imaging device in (2),

[0193] The plurality of display methods include a method for displaying order information indicating the order of the focal lengths during the plurality of pre-shooting operations. (7)

[0195] According to the imaging device in (2),

[0196] The various display methods include a method for displaying a graph in which the vertical axis represents the focal position and the horizontal axis represents time. (8)

[0198] According to the imaging device in (2),

[0199] The focal length display control unit selects one of the various display methods according to the shooting mode. (9)

[0201] According to the imaging device in (8),

[0202] The shooting modes include shooting modes for drama and film, as well as shooting modes for reporting and news. (10)

[0204] The imaging apparatus according to any one of (1) to (9),

[0205] The focal length display control unit performs control so that the currently captured image is also displayed on the display unit. (11)

[0207] According to the imaging device of (10),

[0208] The focal length display control unit performs control to emphasize the subject currently in focus when the currently captured image is displayed on the display unit. (12)

[0210] According to the imaging device of (11),

[0211] The focal length display control unit can emphasize the outline of the subject in focus, or display the image portion other than the subject in focus after blurring. (13)

[0213] According to the imaging device in (1),

[0214] The focal length display control unit magnifies and displays the portion of the focus bar that includes both the current focal length and the focal length at the time of shooting, when the difference between the current focal length and the focal length at the time of shooting is equal to or less than a threshold. (14)

[0216] According to the imaging device in (1),

[0217] The focal length display control unit performs control to display the time required for focal length change, which is the time required for the focal length to move from the focal length registered at the first time of the first pre-shooting time to the focal length registered at the second time of the second pre-shooting time, which is later than the first time, during the pre-shooting preparation. (15)

[0219] An imaging device according to any one of (1) to (14),

[0220] The focal length display control unit will display a warning if the difference between the current focal length and the focal length at the time of shooting is equal to or greater than a threshold. (16)

[0222] The imaging apparatus according to any one of (1) to (15),

[0223] The focal length display control unit performs a warning display if at least one of the viewing angle or subject position in the current captured image differs from that at the time of preparation for shooting. (17)

[0225] The imaging apparatus according to any one of (1) to (16),

[0226] The focal length at the time of shooting and related information are stored in a linked manner. (18)

[0228] According to the imaging device of (17),

[0229] The information related to the focal length at the time of preparation for shooting includes at least one of the following: a thumbnail corresponding to the focal length at the time of preparation for shooting or the time required for the focal length change. (19)

[0231] A method for controlling an imaging device, wherein a focal length display control unit performs control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-capture times, the plurality of focal lengths at pre-capture times indicating focal lengths recorded at pre-capture times and displayed in the order registered at pre-capture times. (20)

[0233] A program for causing a computer to perform a method of controlling an imaging device, wherein a focal length display control unit performs control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-shooting times, the plurality of focal lengths at pre-shooting times indicating focal lengths recorded at pre-shooting times and displayed in the order registered at pre-shooting times.

[0234] List of reference numerals

[0235] 1 Imaging device

[0236] 104 Recording Units

[0237] 105 Control Unit

[0238] 105B Focal Length Display Control Unit

[0239] 108 display units

Claims

1. An imaging apparatus comprising a focal length display control unit, the focal length display control unit performing control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-capture times, the plurality of focal lengths at pre-capture times indicating focal lengths recorded at pre-capture times and displayed in the order registered at pre-capture times. The display methods for the current focal length and the focal length at the time of shooting include multiple display methods, and the focal length display control unit selects at least one of the multiple display methods. The various display methods include: A method for displaying the current focal length and the multiple focal lengths at the time of the planned shot via a focus bar, and displaying multiple thumbnail images corresponding to the multiple focal lengths at the time of the planned shot together with the focus bar, wherein the multiple thumbnail images are processed to emphasize the focused parts and strongly blur the out-of-focus parts.

2. The imaging device according to claim 1, The display mode of the thumbnail images changes according to the progression of the sequence.

3. The imaging device according to claim 1, The plurality of display methods include a method for displaying order information indicating the order of the focal lengths during the plurality of pre-shooting operations.

4. The imaging device according to claim 1, The various display methods include a method for displaying a graph in which the vertical axis represents the focal position and the horizontal axis represents time.

5. The imaging device according to claim 1, The focal length display control unit selects one of the various display methods according to the shooting mode.

6. The imaging device according to claim 5, The shooting modes include shooting modes for drama and film, as well as shooting modes for reporting and news.

7. The imaging apparatus according to claim 1, The focal length display control unit performs control so that the currently captured image is also displayed on the display unit.

8. The imaging apparatus according to claim 7, The focal length display control unit performs control to emphasize the subject currently in focus when the currently captured image is displayed on the display unit.

9. The imaging apparatus according to claim 8, The focal length display control unit can emphasize the outline of the subject in focus, or display the image portion other than the subject in focus after blurring.

10. The imaging apparatus according to claim 1, The focal length display control unit magnifies and displays the portion of the focus bar that includes both the current focal length and the focal length at the time of shooting, when the difference between the current focal length and the focal length at the time of shooting is equal to or less than a threshold.

11. The imaging apparatus according to claim 1, The focal length display control unit performs control to display the time required for focal length change, which is the time required for the focal length to move from the focal length registered at the first time of the first pre-shooting time to the focal length registered at the second time of the second pre-shooting time, which is later than the first time, during the pre-shooting preparation.

12. The imaging apparatus according to claim 1, The focal length display control unit will display a warning if the difference between the current focal length and the focal length at the time of shooting is equal to or greater than a threshold.

13. The imaging apparatus according to claim 1, The focal length display control unit performs a warning display if at least one of the viewing angle or subject position in the current captured image differs from that at the time of preparation for shooting.

14. The imaging apparatus according to claim 1, The focal length at the time of shooting and related information are stored in a linked manner.

15. The imaging apparatus according to claim 14, The information related to the focal length at the time of preparation for shooting includes at least one of the following: a thumbnail corresponding to the focal length at the time of preparation for shooting or the time required for the focal length change.

16. A method of controlling an imaging apparatus, wherein a focal length display control unit performs control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-capture times, the plurality of focal lengths at pre-capture times indicating focal lengths recorded at pre-capture times and displayed in the order registered at pre-capture times. The display methods for the current focal length and the focal length at the time of shooting include multiple display methods, and the focal length display control unit selects at least one of the multiple display methods. The various display methods include: A method for displaying the current focal length and the multiple focal lengths at the time of the planned shot via a focus bar, and displaying multiple thumbnail images corresponding to the multiple focal lengths at the time of the planned shot together with the focus bar, wherein the multiple thumbnail images are processed to emphasize the focused parts and strongly blur the out-of-focus parts.

17. A computer program product comprising instructions for causing a computer to perform a method of controlling an imaging apparatus, wherein a focal length display control unit performs control to display on a display unit a current focal length indicating the current focal length and a plurality of focal lengths at pre-capture times, the plurality of focal lengths at pre-capture times indicating focal lengths recorded at pre-capture times and displayed in the order registered at pre-capture times. The display methods for the current focal length and the focal length at the time of shooting include multiple display methods, and the focal length display control unit selects at least one of the multiple display methods. The various display methods include: A method for displaying the current focal length and the multiple focal lengths at the time of the planned shot via a focus bar, and displaying multiple thumbnail images corresponding to the multiple focal lengths at the time of the planned shot together with the focus bar, wherein the multiple thumbnail images are processed to emphasize the focused parts and strongly blur the out-of-focus parts.

Images