Patent Publication Number: US-2022232146-A1

Title: Video processing apparatus and video processing method

Description:
TECHNICAL FIELD 
     The present disclosure relates to a video processing apparatus and a video processing method, and more particularly, to a video processing apparatus and a video processing method that allow each person involved to make an advance preparation more easily. 
     BACKGROUND ART 
     Video content such as a movie, a drama, or a commercial message (CM) is generally produced on the basis of a scenario prepared in advance, and filming (take) is performed a plurality of times in accordance with the scenario. At a filming location, depending on the video content, a large number of film staff members, such as several tens of members or more than 100 members, may be involved in filming. 
     At the filming location, there are some cases in which the scenario is not sufficiently shared among the film staff members, or the scenario is updated each time rehearsal filming is performed. In such a case, since not all the film staff members sufficiently understand the next scene, the film staff members may fail to operate their equipment in synchronization with each other, and this may result in re-shooting of the scene. 
     To cope with this problem, the film staff members prepare for the next scene by verbally communicating with each other by wireless voice communication about preparations to be made for the next scene, or predicting the next scene while checking a video output from a camera. 
     Furthermore, Patent Document 1 discloses a technology in which, when a movement of an imaging device is stored in a rehearsal mode and filming is performed in a reproduction imaging mode, a symbol for guiding the movement of the imaging device is displayed on the basis of the stored movement of the imaging device. 
     CITATION LIST 
     Patent Document 
     Patent Document 1: Japanese Patent Application Laid-Open No. 2014-112759 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     Except for a case where the scenario is simple, displaying information that indicates the outline of the next scene on the monitor in advance allows the film staff members to make advance preparations more easily. 
     However, Patent Document 1 does not disclose that necessary information is presented for each person involved at the filming location, such as a sound staff member who handles a microphone or a lighting staff member who operates lighting equipment, other than staff in charge of the camera. 
     The present disclosure has been made in view of such circumstances, and is intended to allow each person involved to make an advance preparation more easily. 
     Solutions to Problems 
     A video processing apparatus of the present disclosure includes a presentation control unit that controls, in such a way that, with a first scene of a captured video currently being captured used as a reference, advance information regarding a second scene is presented at a presentation timing before the second scene after the first scene, in a mode corresponding to an output destination of the captured video, the presentation of the advance information. 
     A video processing method of the present disclosure includes controlling, by a video processing apparatus, in such a way that, with a first scene of a captured video currently being captured used as a reference, advance information regarding a second scene is presented at a presentation timing before the second scene after the first scene, in a mode corresponding to an output destination of the captured video, the presentation of the advance information. 
     In the present disclosure, advance information regarding a second scene is presented at a presentation timing, with a first scene of a captured video currently being captured used as a reference, before the second scene after the first scene, in a mode corresponding to an output destination of the captured video. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram illustrating an example of a video processing system to which the technology according to the present disclosure is applied. 
         FIG. 2  is a diagram illustrating an example of an advance preparation to be made by a film staff member. 
         FIG. 3  is a block diagram illustrating a functional configuration example of a camera. 
         FIG. 4  is a flowchart illustrating a flow of advance information generation processing. 
         FIG. 5  is a diagram illustrating an example of generation of the advance information. 
         FIG. 6  is a flowchart illustrating a flow of the advance information presentation processing. 
         FIG. 7  is a diagram illustrating an example of presentation of the advance information. 
         FIG. 8  is a diagram illustrating an example of metadata analysis. 
         FIG. 9  is a diagram illustrating a use case of the technology according to the present disclosure. 
         FIG. 10  is a diagram illustrating a use case of the technology according to the present disclosure. 
         FIG. 11  is a block diagram illustrating a functional configuration example of a display device. 
         FIG. 12  is a diagram illustrating the advance information displayed on the display device of each film staff member. 
         FIG. 13  is a diagram illustrating an example of a filming location. 
         FIG. 14  is a diagram illustrating an example of presentation of the advance information at the filming location. 
         FIG. 15  is a diagram illustrating an example of an advance preparation for each film staff member. 
         FIG. 16  is a diagram schematically illustrating an overall configuration of an operating room system. 
         FIG. 17  is a diagram illustrating an example of display of an operation screen on a centralized operation panel. 
         FIG. 18  is a diagram illustrating an example of a state of surgery for which the operating room system is used. 
         FIG. 19  is a block diagram illustrating an example of a functional configuration of a camera head and a CCU illustrated in  FIG. 18 . 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     A mode for carrying out the present disclosure (hereinafter referred to as an “embodiment”) will be described below. Note that the description will be made in the order below. 
     1. Outline of technology according to present disclosure 
     2. Configuration and operation of video processing apparatus 
     3. Use cases 
     4. Example of presentation of advance information at filming location 
     5. Effects 
     6. Application example 
     1. Outline of Technology According to Present Disclosure 
       FIG. 1  is a diagram illustrating an example of a video processing system to which the technology according to the present disclosure (the present technology) is applied. 
     A camera  10  in  FIG. 1  captures images for production of video content such as a movie, a drama, or a CM. The camera  10  includes a memory  11 , and a rehearsal video captured in a rehearsal filming performed before an actual filming is read into the memory  11  from a recording medium  20  where the rehearsal video is stored. 
     Furthermore, the camera  10  outputs an actual performance video PV currently being captured in the actual filming to output systems that support a serial digital interface (SDI). In the example in  FIG. 1 , the actual performance video PV is displayed on monitors for checking, one for each of a sound staff member H 1 , a lighting staff member H 2 , . . . , and a director H 3 . 
     In the actual filming, filming is performed under substantially the same conditions and settings as those of the rehearsal video, but there is a case where the actual filming is performed again due to a slight difference in operation between performers or film staff members. 
     In the actual filming, the members, each having their own roles such as a camera angle, recording of voice with an external microphone for sound recording, illumination, operation of a camera platform or a crane/dolly on which a camera is mounted, and movement of a performer, operate in harmony with each other so that high-quality video content is produced. 
     In the video processing system of the present technology, each person involved (a film staff member and a performer) checks advance information presented on the monitor of each person involved, and this allows each person involved to make an advance preparation more easily. The advance information is information that prompts each person involved corresponding to an output destination of the actual performance video to perform an operation for a scene after a predetermined time, and is generated by the camera  10  analyzing the rehearsal video read into the memory  11 . 
     Specifically, in the monitor checked by the sound staff member H 1 , advance information d 1  indicating that the camera is supposed to pan to the right after a predetermined time is presented on the actual performance video PV output from the camera  10 . Furthermore, on the monitor checked by the lighting staff member H 2 , advance information d 2  indicating an F-number after the predetermined time is presented on the actual performance video PV output from the camera  10 . 
     Such advance information allows each person involved to make the advance preparation to perform the operation for the scene after the predetermined time. 
     Note that, since the director H 3  only needs to be able to concentrate on the video itself, none of the pieces of advance information is presented on the actual performance video PV displayed on the monitor checked by the director H 3 . 
       FIG. 2  is a diagram illustrating an example in which the sound staff member H 1  and the lighting staff member H 2  make the advance preparations by checking the advance information. 
     In a case of recording voice with the external microphone instead of a microphone built in the camera, the sound staff member H 1  needs to always pay attention to prevent the external microphone from being captured in the actual performance video. 
     As illustrated in  FIG. 2 , in a case where there is a scene in which the camera pans to the right at time t 1 , advance information d 11  in the shape of a right arrow indicating that the camera is supposed to pan to the right is presented at time t 0  on an actual performance video PV 0  being checked by the sound staff member H 1 . 
     This allows the sound staff member H 1  to make an advance preparation to prevent the external microphone from being captured on the right side of the actual performance video. 
     The lighting staff member H 2  adjusts the way of applying light to a subject with a reflector or illuminates the subject with lighting equipment. 
     As illustrated in  FIG. 2 , in a case where there is a scene where a subject (performer) is illuminated with intense light from a light source LS at time t 2 , advance information d 12  indicating that an iris is supposed to be narrowed so that the F-number becomes f/16 is presented, at time t 1 , on an actual performance video PV 1  being checked by the lighting staff member H 2 . The advance information d 12  is indicated as a graph representing a change in the F-number with the downward direction in the figure as a time axis direction. A white dot on a curve of the graph represents the current F-number, and a black dot represents the F-number (=f/16) at time t 3 . 
     This allows the lighting staff member H 2  to make an advance preparation to apply light to the face of the subject with the reflector in order to avoid a decrease in luminance of the face of the subject due to the iris being narrowed. 
     Note that, in the example in  FIG. 2 , a plurality of representative frame images RI representing upcoming scenes is presented on the right edges of the actual performance videos PV 0  and PV 1  and an actual performance video PV 2 . The representative frame images RI are specific frame images extracted from the rehearsal video. The representative frame images RI may be, for example, frame images at timings of scene changes or dramatic movements of the subject, or may be frame images, one for every predetermined number of frames. In the example in  FIG. 2 , the plurality of representative frame images RI is presented, but only one representative frame image RI may be presented. 
     Hereinafter, a configuration and an operation of a video processing apparatus of the present technology that achieves the presentation of the advance information described above will be described. 
     2. Configuration and Operation of Video Processing Apparatus 
     (Block Configuration) 
       FIG. 3  is a block diagram illustrating a functional configuration example of the camera  10  as the video processing apparatus of the present technology. 
     The camera  10  in  FIG. 3  includes the memory  11 , an imaging unit  12 , a video processing unit  13 , an output unit  14 , an advance information generation unit  15 , a metadata generation unit  16 , a presentation control unit  17 , a superimposition unit  18 , and a recording unit  19 . 
     The memory  11  reads and stores video data D 21  and its metadata D 22  of a recorded video (rehearsal video) captured and recorded in advance and stored in the recording medium  20 . In the rehearsal video, the metadata D 22  is recorded together with the video data D 21  for each frame, but the video data D 21  and the metadata D 22  are separately stored in the memory  11 . The metadata D 22  contains time information, a camera parameter, information regarding the posture of the camera, information regarding the position of the camera, sound information, and the like regarding the rehearsal video. 
     The imaging unit  12  is constituted by an optical system such as a zoom lens or an iris, and a solid-state imaging element such as a complementary metal-oxide-semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor. The imaging unit  12  acquires a captured video (actual performance video) by imaging a subject, and supplies an analog video signal representing the captured video to the video processing unit  13 . 
     The video processing unit  13  digitally converts the video signal from the imaging unit  12 , performs predetermined video processing for adjusting a gain, a luminance, a color temperature, and the like to generate video data, and supplies the video data to the output unit  14 . 
     The output unit  14  converts the video data from the video processing unit  13  into a format for each output system, such as an SDI output, an output for a liquid crystal display (LCD) monitor, an output for a viewfinder, or a streaming output, and outputs the converted video data to a display device serving as a corresponding output destination. 
     The advance information generation unit  15  generates advance information as described with reference to  FIGS. 1 and 2  on the basis of the video data D 21  and the metadata D 22  of the rehearsal video stored in the memory  11 . Furthermore, the advance information generation unit  15  obtains a presentation timing at which the generated advance information is to be presented on the basis of the video data D 21  and the metadata D 22  of the rehearsal video stored in the memory  11 . The generated advance information is supplied to the presentation control unit  17  together with the video data D 21 , the metadata D 22 , and information indicating the presentation timing. 
     The metadata generation unit  16  generates metadata corresponding to the video data of the actual performance video generated by the video processing unit  13 . The metadata contains time information, a camera parameter, information regarding the posture of the camera  10 , information regarding the position of the camera  10 , and the like regarding the actual performance video. The generated metadata is supplied to the presentation control unit  17  together with the video data from the video processing unit  13 . 
     The presentation control unit  17  compares the rehearsal video and the actual performance video to control presentation of the advance information. 
     Specifically, the presentation control unit  17  compares the video data D 21  and the metadata D 22  of the rehearsal video from the advance information generation unit  15  with the video data and the metadata of the actual performance video from the metadata generation unit  16 . As a result of comparison between the rehearsal video and the actual performance video, the presentation control unit  17  controls presentation of the advance information such that the advance information is presented in a mode corresponding to the output destination (output system) of the actual performance video at the above-described presentation timing. More specifically, the presentation control unit  17  controls the superimposition unit  18  to control superimposition of the advance information on the video (video data) for each output system output from the output unit  14 . 
     On the basis of the control from the presentation control unit  17 , the superimposition unit  18  superimposes the advance information on the video for each output system output from the output unit  14  so that the advance information is presented at the above-described presentation timing. 
     The recording unit  19  is constituted by, for example, a recording medium such as a magnetic tape or a hard disk. The recording unit  19  records a video output from the output unit  14 . The video output from the output unit  14  may be recorded on the recording medium  20  inserted in a slot provided in the camera  10 . 
     With a configuration as described above, the camera  10  can generate advance information on the basis of a rehearsal video and present the advance information on an actual performance video at an appropriate timing. Hereinafter, an operation of the camera  10  having the above-described configuration will be described. 
     (Flow of Advance Information Generation Processing) 
     First, a flow of advance information generation processing by the camera  10  will be described with reference to a flowchart in  FIG. 4 . The processing in  FIG. 4  is started when, after a rehearsal video stored in the recording medium  20  has been read into the memory  11 , generation of advance information is instructed by a user operation, for example. 
     In step S 11 , the advance information generation unit  15  extracts the metadata D 22  from the video data D 21  of the rehearsal video stored in the memory  11 . 
     In step S 12 , the advance information generation unit  15  detects a time code of an acting start scene from the video data D 21  of the rehearsal video stored in the memory  11 . Time codes are time information indicating temporal positions of frame images in the entire rehearsal video. 
     The acting start scene is a scene at which a specific cut starts in the rehearsal video. The acting start scene is, for example, a scene in which a director&#39;s utterance “Action” has been detected in the rehearsal video, or a scene in which an instruction to start acting by a clapperboard constituted by clappers for making a sound and a board for indicating shot information has been detected as a video or a sound. 
     In step S 13 , the advance information generation unit  15  analyzes the video data D 21  and the metadata D 22  of the rehearsal video starting from the acting start scene. Here, it is sufficient if at least the metadata D 22  of the rehearsal video starting from the acting start scene is analyzed, and the video data D 21  of the rehearsal video does not necessarily need to be analyzed. 
     When a change in the metadata D 22  is detected by the analysis of the video data D 21  and the metadata D 22 , in step S 14 , the advance information generation unit  15  detects a time code of a metadata change scene with the acting start scene used as a reference. 
     In step S 15 , the advance information generation unit  15  generates advance information regarding the metadata change scene on the basis of the changed metadata. The advance information presents a change in the metadata of the actual performance video in the metadata change scene to the user corresponding to the output destination of the actual performance video. The advance information is generated for each output system to which the actual performance video is output as display information including at least one of a character including a number, a symbol, or a figure. 
     Then, in step S 16 , the advance information generation unit  15  obtains a timing to present the advance information. 
     For example, as illustrated in  FIG. 5 , in a case where the camera pans to the right at time t 12  with an acting start scene RV 10  used as a reference in the rehearsal video, the scene at the time t 12  is identified as a metadata change scene RV 12 . 
     The metadata change scene RV 12  is identified by, for example, analysis of gyro information in the metadata of the rehearsal video. Alternatively, the metadata change scene RV 12  may be identified on the basis of, for example, a result of analyzing a movement of the rehearsal video itself. 
     When the metadata change scene RV 12  has been identified, advance information to be presented at time t 11 , which is before the time t 12  of the metadata change scene RV 12 , is generated. 
     In the example in  FIG. 5 , advance information d 51  indicating that the camera is supposed to pan to the right at time t 12  is generated. In addition to the advance information d 51 , advance information in a mode corresponding to the user who checks the monitor serving as the output destination of the actual performance video is generated. 
     Furthermore, the time t 11 , which is the timing to present the advance information, is obtained by going back by a time Ta from the time t 12  of the metadata change scene RV 12 . The length of the time Ta is a preset time length, or may be set to a different time length for each user who checks the monitor serving as the output destination of the actual performance video. That is, the time t 11 , which is the timing to present the advance information, may be set to a different timing for each output destination of the actual performance video. 
     Through processing as described above, advance information is generated, and the timing to present the presentation information in the actual performance video is obtained. 
     Note that, at a filming location, rehearsal filming may include a plurality of takes. In this case, for generation of the advance information, a rehearsal video captured in rehearsal filming of the previous take may be used, or a rehearsal video of a take to be used may be selected on a menu screen. 
     (Flow of Advance Information Presentation Processing) 
     Next, a flow of advance information presentation processing by the camera  10  will be described with reference to a flowchart in  FIG. 6 . The processing in  FIG. 6  is started when capturing of an actual performance video is started. When the capturing of the actual performance video is started, the metadata generation unit  16  starts to generate metadata corresponding to video data of the actual performance video generated by the video processing unit  13 , and supplies the metadata to the presentation control unit  17  together with a frame image of the actual performance video. 
     In step S 31 , the presentation control unit  17  acquires, from the advance information generation unit  15 , advance information and information indicating the timing to present the advance information, together with video data and metadata of a rehearsal video. 
     In step S 32 , the presentation control unit  17  determines whether or not an acting start scene has been detected in the actual performance video from the metadata generation unit  16 . The processing in step S 32  is repeated until it is determined that an acting start scene has been detected in the actual performance video. 
     Then, when it is determined that an acting start scene has been detected in the actual performance video, the processing proceeds to step S 33 . 
     In step S 33 , the presentation control unit  17  compares the actual performance video with the rehearsal video. Specifically, the presentation control unit  17  starts to compare the metadata of the frame images starting from the acting start scene in the actual performance video with the metadata of the frame images starting from the acting start scene in the rehearsal video. 
     Here, at least the time codes of the frame images starting from the acting start scene in the actual performance video are compared with the time codes of the frame images starting from the acting start scene in the rehearsal video. This makes it possible to identify a scene, in the actual performance video, corresponding to each scene in the rehearsal video. 
     Furthermore, other than the time codes, the camera parameter, the information regarding the posture of the camera, the information regarding the position of the camera, the sound information, and the like may be used for comparison between the metadata of the frame images of the actual performance video and that of the rehearsal video. 
     Moreover, in addition to the metadata of the frame images of the actual performance video and that of the rehearsal video, the frame images (video data) of the actual performance video and those of the rehearsal video may be compared. This makes it possible to identify a scene more reliably, in the actual performance video, corresponding to each scene in the rehearsal video. 
     While the actual performance video and the rehearsal video are compared, in step S 34 , the presentation control unit  17  determines whether or not it is a timing to present the advance information. The comparison between the actual performance video and the rehearsal video (processing in step S 33 ) is repeated until it is determined that it is the timing to present the advance information. 
     Then, when it is determined that it is the presentation timing of the advance information, the processing proceeds to step S 35 . 
     In step S 35 , the presentation control unit  17  controls the superimposition unit  18  to superimpose the advance information on the video for each output system output from the output unit  14 . 
     Thereafter, in step S 36 , it is determined whether or not an instruction to end imaging has been given. If it is determined that an instruction to end imaging has been given, the processing in  FIG. 6  ends. 
     For example, as illustrated in  FIG. 7 , when an acting start scene PV 10  corresponding to the acting start scene RV 10  of the rehearsal video is detected in the actual performance video, a comparison between the actual performance video and the rehearsal video is started. 
     At time t 11 , which is the timing to present the advance information, with the acting start scene PV 10  used as a reference, the advance information d 51  indicating that the camera is supposed to pan to the right at time t 12  is superimposed on a scene PV 11  at time t 11  in the actual performance video. 
     Thereafter, in the actual performance video, the camera pans to the right at a scene PV 12  at time t 12 , and the acting ends. 
     In the above-described example, the gyro information of the rehearsal video is analyzed for generation of the advance information for making an advance preparation to prevent the external microphone from being captured on the right side of the actual performance video. Alternatively, it is possible to analyze various types of metadata of the rehearsal video to generate advance information for making a variety of advance preparations. 
       FIG. 8  is a diagram illustrating an example of metadata analysis. 
     For example, analyzing the F-number, which is one of the camera parameters of the rehearsal video, shows a brightness, a depth of field, and focusing. This makes it possible to generate advance information for checking the timing to adjust a reflector or an external illuminating device. 
     Analyzing a focus position, which is one of the camera parameters of the rehearsal video, shows a degree of focus and whether the focus is front focus or rear focus. This makes it possible to generate advance information for checking the timing at which a person, a vehicle, or an object moves. 
     Analyzing a zoom magnification of a lens, which is one of the camera parameters of the rehearsal video, shows a change in angle of view and whether wide-angle or telephoto. This makes it possible to generate advance information for checking the timing at which a nearby/distant object or person starts to move. 
     Analyzing an electronic zoom magnification, which is one of the camera parameters of the rehearsal video, shows a change in angle of view and whether wide-angle or telephoto. This makes it possible to generate advance information for checking the timing at which a nearby/distant object or person starts to move. 
     Analyzing the color temperature, which is one of the camera parameters of the rehearsal video, shows not only the color temperature but also whether indoor or outdoor, and weather. This makes it possible to generate advance information for checking the timing to switch between stage lighting and an indoor/outdoor light source. 
     Analyzing a knee point and a knee slope, which are one of the camera parameters of the rehearsal video, shows how an image of a high luminance portion will look. This makes it possible to generate advance information for checking the timing to adjust a reflector or an external illuminating device. 
     Analyzing the gain, which is one of the camera parameters of the rehearsal video, shows a gain setting (bright or dark, or noise). This makes it possible to generate advance information for checking the timing to adjust a reflector or an external illuminating device. 
     Analyzing whether an ND filter and a CC filter are used, which is one of the camera parameters of the rehearsal video, shows a filter density (bright or dark, or color temperature). This makes it possible to generate advance information for checking the timing to adjust a reflector or an external illuminating device. 
     Analyzing time codes and the time, which are one of the pieces of time information of the rehearsal video, makes it possible to generate advance information for presenting a difference between the current imaging time and the time at which the advance information is to be displayed. 
     Analyzing sound information of the rehearsal video shows a sound level. This makes it possible to generate advance information for checking the timing to add sound or remove sound. 
     Analyzing global positioning system (GPS) information, which is one of pieces of the information regarding the position of the camera at the time of capturing the rehearsal video, shows an imaging position. This makes it possible to generate advance information for avoiding interfering with the imaging, and advance information for preparing a subject to be imaged. 
     As described above, analyzing the gyro information, which is one of pieces of the information regarding the posture of the camera at the time of capturing the rehearsal video, shows an imaging direction. This makes it possible to generate advance information for avoiding interfering with the imaging, and advance information for preparing a subject to be imaged. 
     Analyzing the face information of the rehearsal video shows whether there is a face, the position of the face, gender, and race. This makes it possible to generate advance information for checking the timing at which a performer appears or the timing at which a performer disappears. 
     The advance information for making a variety of advance preparations generated as described above is presented in a mode corresponding to the output destination of the actual performance video, with detection of the acting start scene in the actual performance video as a trigger. That is, according to the above processing, it is possible to allow each person involved to make an advance preparation more easily at a filming location. 
     3. Use Cases 
     A use case of a video processing system to which the present technology is applied will be described. 
     (Use Case 1) 
     A camera  10 A illustrated in  FIG. 9  captures images for production of a movie. In general, a camera for producing a movie allows for an output to a plurality of output systems such as an output for a viewfinder (VF), an output for an LCD monitor, a main line SDI output, and an SDI output for a monitor. The film staff member who checks the monitor is often of a different role depending on the output system of the monitor. 
     In the example in  FIG. 9 , camera assistants H 11 - 1  and H 11 - 2  are checking an actual performance video PV 31  output to a VF or an LCD monitor, and a lighting staff member H 12  is checking the actual performance video PV 31  output to an SDI monitor. Furthermore, a director H 13  is checking the actual performance video PV 31  displayed on a main line SDI monitor. 
     Advance information d 31  indicating that the camera is supposed to pan to the right after a predetermined time is superimposed on the actual performance video PV 31  being checked by the camera assistants H 11 - 1  and H 11 - 2 . This allows the camera assistants H 11 - 1  and H 11 - 2  to make an advance preparation for panning the camera to the right after the predetermined time. 
     The advance information d 31  indicating that the camera is supposed to pan to the right after the predetermined time is also superimposed on the actual performance video PV 31  being checked by the lighting staff member H 12 . This allows the lighting staff member H 12  to make an advance preparation to perform an operation for the camera panning to the right after the predetermined time. Note that representative frame images RI 31  representing upcoming scenes are superimposed on the right edge of the actual performance video PV 31  being checked by the lighting staff member H 12 . 
     None of the pieces of advance information is superimposed on the actual performance video PV 31  being checked by the director H 13 . This allows the director H 13  to concentrate on the actual performance video itself being captured. 
     (Use Case 2) 
     A camera  10 B illustrated in  FIG. 10  also captures images for production of a movie. 
     In the example in  FIG. 10 , in a similar manner to that in  FIG. 9 , the camera assistants H 11 - 1  and H 11 - 2  are checking the actual performance video PV 31  output to a VF or an LCD monitor, and the director H 13  is checking the actual performance video PV 31  displayed on a main line SDI monitor. Furthermore, in the example in  FIG. 10 , a director of photography H 21  is checking the actual performance video PV 31  output to an SDI monitor. 
     The advance information d 31  indicating that the camera is supposed to pan to the right after a predetermined time is superimposed on the actual performance video PV 31  being checked by the director of photography H 21 . This allows the director of photography H 21  to make an advance preparation for panning the camera to the right after the predetermined time. 
     In addition, in the example in  FIG. 10 , the actual performance video PV 31  is wirelessly streamed and output to a monitor of a small display device carried by each of film staff members H 30  at the filming location. The actual performance video PV 31  is streamed and output to a plurality of the display devices via a hub. 
     On the monitor of the display device, buttons b 1 , b 2 , b 3 , and b 4 , one for each role of the film staff members H 30 , are displayed in addition to the actual performance video PV 31 . The button b 1  is a button for a sound staff member, and the button b 2  is a button for a lighting staff member. Furthermore, the button b 3  is a button for a performer, and the button b 4  is a button for a crane/dolly operator. 
     Each of the film staff members H 30  can select the button for his/her role on the monitor of the display device and check advance information necessary for his/her advance preparation. 
     Here, a configuration of the display device carried by each of the film staff members H 30  will be described with reference to  FIG. 11 . 
     A display device  110  illustrated in  FIG. 11  is configured as, for example, a mobile terminal such as a tablet terminal or a smartphone. 
     The display device  110  includes an I/F unit  111 , an input unit  112 , a presentation control unit  113 , and a monitor  114 . 
     The I/F unit  111  is a wireless interface for communication compatible with a wireless communication standard such as Wi-Fi (registered trademark), 4G, or 5G. The I/F unit  111  receives an actual performance video streamed and output from the camera  10 , and supplies the actual performance video to the presentation control unit  113 . 
     Note that the actual performance video on which all pieces of advance information in modes, one for each of the corresponding output systems, are superimposed is streamed and output to the display device  110 . 
     The input unit  112  constitutes a touch panel together with the monitor  114 , and accepts a user&#39;s operation on the touch panel. For example, the input unit  112  accepts a selection operation of any one of the buttons b 1 , b 2 , b 3 , or b 4  displayed on the monitor  114 , and supplies an operation signal indicating the content of the operation to the presentation control unit  113 . 
     On the basis of the operation signal from the input unit  112 , the presentation control unit  113  controls presentation of the advance information such that the advance information is presented in a mode corresponding to the output destination. Specifically, in accordance with the selection operation by the user selecting the button displayed on the monitor  114 , the presentation control unit  113  causes the monitor  114  to display the actual performance video on which the advance information in the mode corresponding to the output system corresponding to the selected button is superimposed. 
     More specifically, the presentation control unit  113  deletes advance information other than the advance information in the mode corresponding to the output system corresponding to the selected button from the actual performance video on which all pieces of the advance information in the modes, one for each of the corresponding output systems, are superimposed, and then causes the monitor  114  to present the actual performance video. 
     The monitor  114  constitutes a touch panel together with the input unit  112 , and displays, on the basis of the control from the presentation control unit  113 , the actual performance video on which the advance information in the mode corresponding to the output system corresponding to the selected button is superimposed. 
       FIG. 12  is a diagram illustrating the actual performance video displayed on the display device  110  of each of the film staff members H 30 . 
     A of  FIG. 12  illustrates the actual performance video PV 31  displayed on the display device  110  carried by a sound staff member H 31 . By selecting the button b 1  displayed on the monitor  114  of the display device  110 , the sound staff member H 31  can check the actual performance video PV 31  on which the advance information d 31  indicating that the camera is supposed to pan to the right after a predetermined time is superimposed. This allows the sound staff member H 31  to make an advance preparation to prevent the external microphone from being captured on the right side of the actual performance video after the predetermined time. 
     B of  FIG. 12  illustrates the actual performance video PV 31  displayed on the display device  110  carried by a lighting staff member H 32 . By selecting the button b 2  displayed on the monitor  114  of the display device  110 , the lighting staff member H 32  can check the actual performance video PV 31  on which advance information d 32  indicating that the F-number is supposed to become f/16 after a predetermined time is superimposed. This allows the lighting staff member H 32  to make an advance preparation for applying light to a face of a subject with a reflector after the predetermined time. 
     C of  FIG. 12  illustrates the actual performance video PV 31  displayed on the display device  110  carried by a performer H 33 . By selecting the button b 3  displayed on the monitor  114  of the display device  110 , the performer H 33  can check the actual performance video PV 31  on which advance information d 33  indicating the position where the body and face of the performer H 33  are supposed to appear after a predetermined time is superimposed. This allows the performer H 33  to make an advance preparation for acting at a correct position to stand after the predetermined time. 
     D of  FIG. 12  illustrates the actual performance video PV 31  displayed on the display device  110  carried by a crane/dolly operator H 34 . By selecting the button b 4  displayed on the monitor  114  of the display device  110 , the crane/dolly operator can check the actual performance video PV 31  on which the advance information d 31  indicating that the camera is supposed to pan to the right after a predetermined time is superimposed. This allows the crane/dolly operator to make an advance preparation for panning the camera to the right after the predetermined time. 
     With the above configuration, each of the film staff members H 30  can select the button for his/her role on the monitor  114  of the display device  110  to switch the advance information and check the advance information necessary for his/her advance preparation. 
     Note that, in the above description, the pieces of the advance information for all the output systems are superimposed and then streamed and output from the camera  10 . Alternatively, the actual performance video and the pieces of the advance information for all the output systems may be separately streamed and output. In this case, the presentation control unit  113  selects the advance information in the mode corresponding to the output system corresponding to the selected button from the pieces of the advance information for all the output systems, and superimposes the advance information on the actual performance video. 
     4. Example of Presentation of Advance Information at Filming Location 
       FIG. 13  is a diagram illustrating an example of a filming location. 
     As illustrated in  FIG. 13 , at a filming location where images are captured for production of video content such as a movie, a drama, or a CM, many film staff members are involved in the production. 
     In the example in  FIG. 13 , the film staff members at the filming location include, most notably a director, but also a director of photography, a producer, a camera operator, a camera assistant, a sound staff member, a lighting staff member, a crane/dolly operator, and a script supervisor who manages the state and contents of a filming scene. In addition to these film staff members, not only a plurality of performers who are subjects to be imaged, but also personnel from a sponsor of the video content production and the like are at the filming location. 
     Each of the film staff members and the performers at the filming location can check a video output from the camera  10  to each one of a plurality of monitors. 
     In the example in  FIG. 13 , the lighting staff member is checking the video output to a monitor  210 A, the sound staff member is checking the video output to a monitor  210 B, and the camera operator is checking the video output to a monitor  210 C. Furthermore, a camera assistant # 1  serving as a focus puller (in charge of focus management) is checking the video output to a monitor  210 D, a camera assistant # 2  in charge of lens management is checking the video output to a monitor  210 E, and a performer waiting to be called is checking the video output to a monitor  210 F. Then, the director of photography is checking the video output to a monitor  210 G, another performer waiting to be called, the script supervisor, and the personnel from the sponsor are checking the video output to a monitor  210 H, and the director is checking the video output to a monitor  210 I. 
     Each person involved at the filming location has a different role, and thus focuses on a different point in a video. Presenting appropriate advance information on the monitor checked by each person involved allows each person involved to make an advance preparation efficiently without fail in an actual filming in which mistakes are not tolerated. 
       FIG. 14  is a diagram illustrating an example of presentation of the advance information on each of the monitors  210 A to  210 H at the filming location illustrated in  FIG. 13 . It is assumed that the same scene in the actual performance video is displayed on each of the monitors  210 A to  210 H. 
     The monitor  210 A checked by the lighting staff member presents advance information d 211  in the shape of a right arrow indicating that the camera is supposed to pan to the right after a certain period of time, and advance information d 212  indicating that the F-number is supposed to become f/16. This allows the lighting staff member to make an advance preparation for operating a reflector and lighting equipment. 
     The monitor  210 B checked by the sound staff member presents the advance information d 211  in the shape of a right arrow indicating that the camera is supposed to pan to the right after the certain period of time, and advance information d 213  indicating the sound level after a certain period of time. The advance information d 213  is indicated as a graph representing a change in the sound level with the downward direction in the figure as a time axis direction. A white dot on a curve of the graph represents the current sound level, and a black dot represents the sound level after the certain period of time. This allows the sound staff member to make an advance preparation for appropriately adjusting the sound level while preventing the external microphone from being captured. 
     The monitor  210 C checked by the camera operator presents the advance information d 211  in the shape of a right arrow indicating that the camera is supposed to pan to the right after the certain period of time, and advance information d 214  in the shape of a rectangular frame indicating that a specific range in the screen is supposed to be zoomed in and displayed. In this case, after the certain period of time, the video in the range surrounded by the advance information d 214  is displayed on the entire monitor  210 C. This allows the camera operator to make an advance preparation for performing a zoom operation of the camera  10 . 
     The monitor  210 D checked by the camera assistant # 1  presents the advance information d 211  in the shape of a right arrow indicating that the camera is supposed to pan to the right after the certain period of time, and the advance information d 214  in the shape of a rectangular frame indicating that a specific range in the screen is supposed to be zoomed in and displayed. This also allows the camera assistant # 1  serving as the focus puller to make an advance preparation for performing a zoom operation of the camera  10 , in a similar manner to the camera operator. 
     The monitor  210 E checked by the camera assistant # 2  presents the advance information d 211  in the shape of a right arrow indicating that the camera is supposed to pan to the right after the certain period of time. This allows the camera assistant # 2  in charge of lens management to make an advance preparation for replacing the lens of the camera  10  with an appropriate lens. 
     The monitor  210 F checked by the performer waiting to be called presents advance information d 215  indicating the position where the performer&#39;s body and face are supposed to appear after a certain period of time. This allows the performer waiting to be called to make an advance preparation for acting at the correct position to stand after the certain period of time. 
     None of the pieces of advance information is presented on the monitor  210 G checked by the director of photography. This allows the director of photography to concentrate on checking the entire filming work such as a camerawork, an arrangement of the illumination, and a composition of the video. 
     The monitor  210 H checked by the other performer waiting to be called, the script supervisor, and the personnel from the sponsor displays a screen on which the actual performance video superimposed with the advance information d 215  indicating the position where the performer&#39;s body and face are supposed to appear after the certain period of time is displayed, and a plurality of representative frame images RI 210  representing scenes during the certain period of time. This allows the performer waiting to be called to make an advance preparation for acting at the correct position to stand after the certain period of time, and the script supervisor to check a transition between the scenes during the certain period of time. 
     The monitor  210 I checked by the director displays a screen on which only the actual performance video is displayed, and the plurality of representative frame images RI 210  representing the scenes during the certain period of time. Since the director can get an image in his/her head of the position where the performer is supposed to stand, unlike the monitor  210 H, the monitor  210 I does not present the advance information d 215 . 
     Here, with reference to  FIG. 15 , metadata used for generation of advance information to be presented for each of the above-described film staff members (including performers), and an advance preparation that can be made by each of the film staff members on the basis of the advance information will be exemplified. 
     In the example in  FIG. 14 , the monitor checked by the director of photography does not present advance information, but the monitor may present advance information generated on the basis of the F-number, the luminance, and the imaging direction of pan/tilt. In this case, the director of photography can check the timing to change the iris of the lens or the gain, and can check the timing to change the imaging direction of the camera. 
     The monitor checked by the camera operator presents advance information generated on the basis of GPS information, gyro information, a lens zoom magnification, and an electronic zoom magnification. This allows the camera operator to check the timing to pan/tilt the camera, and check the timing to operate the lens zoom and the electronic zoom. 
     The monitor checked by the camera assistant # 1  in charge of movement of equipment such as a focus puller and a monitor presents advance information generated on the basis of the focus position, the GPS information, the gyro information, the lens zoom magnification, and the electronic zoom magnification. This allows the camera assistant # 1  to check the timing to pan/tilt the camera and check the timing to operate the lens zoom and the electronic zoom, and also check the timing to change the position of the camera and check the timing to change the focus. 
     The monitor checked by the camera assistant # 2  in charge of lens replacement, an imaging condition memo, monitor movement, and imaging medium management presents advance information generated on the basis of the GPS information, the gyro information, the lens zoom magnification, and the electronic zoom magnification. This allows the camera assistant # 2  to check the timing to pan/tilt the camera, check the timing to operate the lens zoom and the electronic zoom, and also check the timing to change the position of the camera. 
     The monitor checked by a person in charge of camera equipment who manages camera equipment such as a cable, a battery, and various adapters presents advance information generated on the basis of the GPS information and the gyro information. This allows the person in charge of camera equipment to check the timing to pan/tilt the camera, and check the timing to change the position of the camera. 
     The monitor checked by the script supervisor presents advance information generated on the basis of the face information. This allows the script supervisor to check connections between cuts in advance. 
     The monitor checked by the sound staff member presents advance information generated on the basis of sound information and the imaging direction of pan/tilt. This allows the sound staff member to check the timing to prevent an external microphone from being captured in the video. 
     The monitor checked by the performer presents advance information generated on the basis of the gyro information, the GPS information, the face information, and the zoom magnification. This allows the performer to check the timing at which the performer is supposed to appear in the video or the timing at which the performer is supposed to disappear from the video. 
     The monitor checked by the crane/dolly operator presents advance information generated on the basis of the gyro information, the GPS information, the face information, and the zoom magnification. This allows the crane/dolly operator to check the timing to move the crane or dolly. 
     The monitor checked by the lighting staff member presents advance information generated on the basis of the F-number, the luminance, and the color temperature. This allows the lighting staff member to check the timing to operate a reflector or an external illuminating device. 
     The monitor checked by a prompter presents advance information generated on the basis of voice and face information. This allows the prompter to check the timing to prompt the performer. 
     The monitor checked by a prop/art staff member presents advance information generated on the basis of the GPS information and the gyro information. This allows the prop/art staff member to check the timing to move a prop or a film set as a subject. 
     5. Effects 
     In production of video content such as a movie, a drama, or a CM, a director creates in his/her head an image of a camerawork to be used for filming of the next scene. On the other hand, other film staff members such as a camera assistant, a sound staff member, and a lighting staff member often have difficulty understanding the image only by listening to a verbal instruction from the director, viewing a scenario in a rough sketch or in writing, or viewing a video being captured on a monitor. The present technology allows film staff members other than the director to determine advance preparations to be made for the next scene more easily. 
     For example, in a case of recording voice by bringing an external microphone different from the microphone built in the camera close to a performer, the sound staff member needs to pay attention to the position of the external microphone and the position where the sound staff member stands so as to prevent the external microphone from being captured in the actual performance video. In such a case, the sound staff member can check in advance, with the use of advance information, whether the camera is supposed to pan or tilt after a certain period of time, and whether the camera is supposed to zoom toward the telephoto end or toward the wide-angle end. This facilitates an advance preparation to prevent the external microphone from being captured in the actual performance video. 
     Furthermore, the lighting staff member uses a reflector to apply reflected light to the face of the performer, or uses lighting equipment to adjust light to be applied to a subject. Since the way of applying light varies depending on the scene, the lighting staff member can check in advance, with the use of advance information, the camera angle, the position where the performer is supposed to stand, the change in brightness, and the like after a certain period of time. This facilitates an advance preparation for the position of the reflector or operation of the lighting equipment. 
     A crane and a dolly are large and heavy equipment, and are therefore moved by a plurality of crane/dolly operators in some cases. In such a case, the crane/dolly operators can check in advance, with the use of advance information, the angle of view with which filming is to be performed in a scene after a certain period of time. This facilitates an advance preparation for operation of the crane and the dolly. 
     Furthermore, the actual performance video is streamed and output wirelessly, and the advance information is presented on a plurality of small display devices carried one by each of the film staff members, so that each film staff member can check only the advance information necessary for the film staff member. 
     6. Application Example 
     The technology according to the present disclosure can be applied to a variety of products. For example, the technology according to the present disclosure may be applied to an operating room system. 
       FIG. 16  is a diagram schematically illustrating an overall configuration of an operating room system  5100  to which the technology according to the present disclosure can be applied. Referring to  FIG. 16 , the operating room system  5100  has a configuration in which a group of devices installed in the operating room are connected with each other via an audiovisual controller (AV controller)  5107  and an operating room control device  5109 , and can cooperate with each other. 
     A variety of devices may be installed in the operating room.  FIG. 16  illustrates, as an example, a group of various devices  5101  for endoscopic surgery, a ceiling camera  5187  that is provided on the ceiling of the operating room and images an area an operator is working on, an operating theater camera  5189  that is provided on the ceiling of the operating room and images a state of the entire operating room, a plurality of display devices  5103 A to  5103 D, a recorder  5105 , a patient bed  5183 , and an illuminating device  5191 . 
     Here, among these devices, the group of devices  5101  belongs to an endoscopic surgery system  5113  described later, and includes an endoscope and a display device that displays an image captured by the endoscope. The devices that belong to the endoscopic surgery system  5113  are also referred to as medical-use equipment. On the other hand, the display devices  5103 A to  5103 D, the recorder  5105 , the patient bed  5183 , and the illuminating device  5191  are devices provided, separately from the endoscopic surgery system  5113 , in the operating room, for example. These devices that do not belong to the endoscopic surgery system  5113  are also referred to as non-medical use equipment. The audiovisual controller  5107  and/or the operating room control device  5109  control operations of the medical equipment and the non-medical equipment in cooperation with each other. 
     The audiovisual controller  5107  integrally controls processing related to image display in the medical equipment and the non-medical equipment. Specifically, among the devices included in the operating room system  5100 , the group of devices  5101 , the ceiling camera  5187 , and the operating theater camera  5189  can be devices (hereinafter also referred to as transmission source devices) having a function of transmitting information to be displayed during surgery (hereinafter also referred to as display information). Furthermore, the display devices  5103 A to  5103 D can be devices to which display information is output (hereinafter also referred to as output destination devices). Furthermore, the recorder  5105  can be a device that is both a transmission source device and an output destination device. The audiovisual controller  5107  has a function of controlling operations of a transmission source device and an output destination device, acquiring display information from the transmission source device, transmitting the display information to the output destination device, and displaying or recording the display information. Note that the display information includes various images captured during surgery and various types of information regarding surgery (e.g., physical information of a patient, past examination results, and information regarding a surgical procedure). 
     Specifically, information regarding an image of a surgical site in a body cavity of a patient imaged by the endoscope can be transmitted as display information from the group of devices  5101  to the audiovisual controller  5107 . Furthermore, information regarding an image of the area the operator is working on captured by the ceiling camera  5187  can be transmitted as display information from the ceiling camera  5187 . Furthermore, information regarding an image indicating the state of the entire operating room captured by the operating theater camera  5189  can be transmitted as display information from the operating theater camera  5189 . Note that, in a case where there is another device having an imaging function in the operating room system  5100 , the audiovisual controller  5107  may acquire, also from the other device, information regarding an image captured by the other device as display information. 
     Alternatively, for example, in the recorder  5105 , information regarding these images captured in the past is recorded by the audiovisual controller  5107 . The audiovisual controller  5107  can acquire information regarding the images captured in the past from the recorder  5105  as display information. Note that various types of information regarding surgery may also be recorded in the recorder  5105  in advance. 
     The audiovisual controller  5107  causes at least one of the display devices  5103 A to  5103 D, which are output destination devices, to display the acquired display information (that is, images captured during surgery and various types of information regarding surgery). In the illustrated example, the display device  5103 A is a display device installed and suspended from the ceiling of the operating room, the display device  5103 B is a display device installed on a wall surface of the operating room, the display device  5103 C is a display device installed on a desk in the operating room, and the display device  5103 D is a mobile device (e.g., a tablet personal computer (PC)) having a display function. 
     Furthermore, although not illustrated in  FIG. 16 , the operating room system  5100  may include a device outside the operating room. The device outside the operating room can be, for example, a server connected to a network constructed inside and outside a hospital, a PC used by medical staff, or a projector installed in a conference room in the hospital. In a case where there is such an external device outside the hospital, the audiovisual controller  5107  can also cause a display device in another hospital to display the display information via a video conference system or the like for telemedicine. 
     The operating room control device  5109  integrally controls processing other than processing related to image display in the non-medical equipment. For example, the operating room control device  5109  controls driving of the patient bed  5183 , the ceiling camera  5187 , the operating theater camera  5189 , and the illuminating device  5191 . 
     The operating room system  5100  is provided with a centralized operation panel  5111 . Via the centralized operation panel  5111 , a user can give an instruction regarding image display to the audiovisual controller  5107 , or give an instruction regarding operation of the non-medical equipment to the operating room control device  5109 . The centralized operation panel  5111  is constituted by a touch panel provided on a display surface of a display device. 
       FIG. 17  is a diagram illustrating an example of display of an operation screen on the centralized operation panel  5111 .  FIG. 17  illustrates, as an example, an operation screen for a case where two display devices are provided as output destination devices in the operating room system  5100 . Referring to  FIG. 17 , an operation screen  5193  has a transmission source selection area  5195 , a preview area  5197 , and a control area  5201 . 
     In the transmission source selection area  5195 , a transmission source device provided in the operating room system  5100  and a thumbnail screen representing display information in the transmission source device are displayed in association with each other. A user can select display information to be displayed on the display devices from one of the transmission source devices displayed in the transmission source selection area  5195 . 
     In the preview area  5197 , previews of screens displayed on the two display devices (Monitor  1  and Monitor  2 ), which are output destination devices, are displayed. In the illustrated example, four images are displayed in picture-in-picture mode on one display device. The four images correspond to the display information transmitted from the transmission source device selected in the transmission source selection area  5195 . One of the four images is displayed relatively large as a main image, and the remaining three images are displayed relatively small as sub-images. The user can switch between the main image and a sub image by appropriately selecting from among areas in which the four images are displayed. Furthermore, a status display area  5199  is provided below the areas in which the four images are displayed, and a status regarding surgery (e.g., elapsed time of surgery and physical information of a patient) can be appropriately displayed in the area. 
     The control area  5201  is provided with a transmission source operation area  5203  in which graphical user interface (GUI) components for operating the transmission source device are displayed, and an output destination operation area  5205  in which GUI components for operating the output destination devices are displayed. In the illustrated example, the transmission source operation area  5203  is provided with GUI components for performing various operations (pan, tilt, and zoom) on a camera in the transmission source device having an imaging function. The user can operate the camera in the transmission source device by appropriately selecting from among these GUI components. Note that, although not illustrated, in a case where the transmission source device selected in the transmission source selection area  5195  is a recorder (that is, in a case where an image that has been recorded in the recorder in the past is displayed in the preview area  5197 ), the transmission source operation area  5203  may be provided with GUI components for performing operations such as play, stop, rewind, and fast forward of the image. 
     Furthermore, the output destination operation area  5205  is provided with GUI components for performing various operations (swap, flip, color adjustment, contrast adjustment, and switching between 2D display and 3D display) on display on the display devices, which are the output destination devices. The user can operate the display on the display device by appropriately selecting from among these GUI components. 
     Note that the operation screen displayed on the centralized operation panel  5111  is not limited to the illustrated example. A user may be able to perform, via the centralized operation panel  5111 , an operation input for each of the devices that are provided in the operating room system  5100  and can be controlled by the audiovisual controller  5107  and the operating room control device  5109 . 
       FIG. 18  is a diagram illustrating an example of a state of surgery for which the operating room system described above is used. The ceiling camera  5187  and the operating theater camera  5189  are provided on the ceiling of the operating room, and can image an area an operator (surgeon)  5181 , who performs treatment on an affected part of a patient  5185  on the patient bed  5183 , is working on, and the state of the entire operating room. The ceiling camera  5187  and the operating theater camera  5189  may have a magnification adjustment function, a focal length adjustment function, an imaging direction adjustment function, and the like. The illuminating device  5191  is provided on the ceiling of the operating room, and illuminates at least the area the operator  5181  is working on. The illuminating device  5191  may be appropriately adjustable in amount of emitted light, wavelength (color) of the emitted light, direction of emission of the light, and the like. 
     As illustrated in  FIG. 16 , the endoscopic surgery system  5113 , the patient bed  5183 , the ceiling camera  5187 , the operating theater camera  5189 , and the illuminating device  5191  are connected with each other via the audiovisual controller  5107  and the operating room control device  5109  (not illustrated in  FIG. 18 ), and can cooperate with each other. The centralized operation panel  5111  is provided in the operating room, and as described above, a user can appropriately operate these devices in the operating room via the centralized operation panel  5111 . 
     Hereinafter, a configuration of the endoscopic surgery system  5113  will be described in detail. As illustrated, the endoscopic surgery system  5113  includes an endoscope  5115 , other surgical tools  5131 , a support arm device  5141  that supports the endoscope  5115 , and a cart  5151  on which various devices for endoscopic surgery are mounted. 
     In endoscopic surgery, an abdominal wall is not cut and opened, but is pierced with a plurality of tubular hole-opening instruments called trocars  5139   a  to  5139   d . Then, a lens barrel  5117  of the endoscope  5115  and the other surgical tools  5131  are inserted into a body cavity of the patient  5185  through the trocars  5139   a  to  5139   d . In the illustrated example, an insufflation tube  5133 , an energy treatment tool  5135 , and forceps  5137  are inserted into the body cavity of the patient  5185  as the other surgical tools  5131 . Furthermore, the energy treatment tool  5135  is used to perform incision and exfoliation of tissue, sealing of a blood vessel, or the like by using a high-frequency current or ultrasonic vibration. However, the illustrated surgical tools  5131  are merely an example, and various surgical tools generally used in endoscopic surgery, such as tweezers and a retractor, may be used as the surgical tools  5131 . 
     An image of a surgical site in the body cavity of the patient  5185  captured by the endoscope  5115  is displayed on a display device  5155 . The operator  5181  performs treatment such as excision of an affected part, for example, using the energy treatment tool  5135  or the forceps  5137  while viewing the image of the surgical site displayed on the display device  5155  in real time. Note that, although not illustrated, the insufflation tube  5133 , the energy treatment tool  5135 , and the forceps  5137  are supported by the operator  5181 , an assistant, or the like during surgery. 
     (Support Arm Device) 
     The support arm device  5141  includes an arm  5145  extending from a base portion  5143 . In the illustrated example, the arm  5145  includes joints  5147   a ,  5147   b , and  5147   c , and links  5149   a  and  5149   b , and is driven by control of an arm control device  5159 . The arm  5145  supports the endoscope  5115  so as to control its position and posture. With this arrangement, the position of the endoscope  5115  can be stably fixed. 
     (Endoscope) 
     The endoscope  5115  includes the lens barrel  5117  whose predetermined length from its distal end is inserted into the body cavity of the patient  5185 , and a camera head  5119  connected to a proximal end of the lens barrel  5117 . In the illustrated example, the endoscope  5115  configured as a so-called rigid endoscope having the lens barrel  5117  that is rigid is illustrated. Alternatively, the endoscope  5115  may be configured as a so-called flexible endoscope having the lens barrel  5117  that is flexible. 
     The lens barrel  5117  is provided with, at the distal end thereof, an opening portion in which an objective lens is fitted. The endoscope  5115  is connected with a light source device  5157 . Light generated by the light source device  5157  is guided to the distal end of the lens barrel by a light guide extending inside the lens barrel  5117 , and is emitted through the objective lens toward an observation target in the body cavity of the patient  5185 . Note that the endoscope  5115  may be a forward-viewing endoscope, an oblique-viewing endoscope, or a side-viewing endoscope. 
     The camera head  5119  is provided with an optical system and an imaging element inside thereof, and light reflected from the observation target (observation light) is collected on the imaging element by the optical system. The imaging element photoelectrically converts the observation light to generate an electric signal corresponding to the observation light, that is, an image signal corresponding to an observation image. The image signal is transmitted to a camera control unit (CCU)  5153  as raw data. Note that the camera head  5119  has a function of adjusting a magnification and a focal length by appropriately driving the optical system. 
     Note that the camera head  5119  may be provided with a plurality of imaging elements in order to support, for example, stereoscopic viewing (3D display). In this case, the lens barrel  5117  is provided with a plurality of relay optical systems inside thereof to guide observation light to each one of the plurality of imaging elements. 
     (Various Devices Mounted on Cart) 
     The CCU  5153  is constituted by a central processing unit (CPU), a graphics processing unit (GPU), and the like, and integrally controls operations of the endoscope  5115  and the display device  5155 . Specifically, the CCU  5153  performs, on an image signal received from the camera head  5119 , various types of image processing for displaying an image based on the image signal, such as development processing (demosaic processing), for example. The CCU  5153  provides the display device  5155  with the image signal that has been subjected to the image processing. Furthermore, the audiovisual controller  5107  illustrated in  FIG. 16  is connected to the CCU  5153 . The CCU  5153  also provides the audiovisual controller  5107  with the image signal that has been subjected to the image processing to. Furthermore, the CCU  5153  transmits a control signal to the camera head  5119  to control its driving. The control signal may contain information regarding imaging conditions such as the magnification and the focal length. The information regarding the imaging conditions may be input via an input device  5161  or may be input via the centralized operation panel  5111  described above. 
     The CCU  5153  controls the display device  5155  to display an image based on the image signal on which the CCU  5153  has performed image processing. In a case where, for example, the endoscope  5115  supports imaging with a high resolution such as 4K (3840 horizontal pixels×2160 vertical pixels) or 8K (7680 horizontal pixels×4320 vertical pixels), and/or in a case where the endoscope  5115  supports 3D display, a display device supporting high-resolution display and/or 3D display can be used accordingly as the display device  5155 . In a case where imaging with a high resolution such as 4K or 8K is supported, a display device having a size of 55 inches or more can be used as the display device  5155  to provide more immersive feeling. Furthermore, a plurality of the display devices  5155  having different resolutions and sizes may be provided in accordance with the intended use. 
     The light source device  5157  includes a light source such as a light emitting diode (LED), for example, and supplies the endoscope  5115  with emitted light at the time of imaging a surgical site. 
     The arm control device  5159  is constituted by a processor such as a CPU, and operates in accordance with a predetermined program to control driving of the arm  5145  of the support arm device  5141  in accordance with a predetermined control method. 
     The input device  5161  is an input interface to the endoscopic surgery system  5113 . A user can input various types of information and input instructions to the endoscopic surgery system  5113  via the input device  5161 . For example, the user may input, via the input device  5161 , various types of information regarding surgery, such as physical information of a patient and information regarding a surgical procedure. Furthermore, for example, the user may input, via the input device  5161 , an instruction to drive the arm  5145 , an instruction to change imaging conditions (the type of emitted light, the magnification and focal length, and the like) of the endoscope  5115 , an instruction to drive the energy treatment tool  5135 , and the like. 
     The type of the input device  5161  is not limited, and various known input devices may be used as the input device  5161 . As the input device  5161 , for example, a mouse, a keyboard, a touch panel, a switch, a foot switch  5171 , and/or a lever can be used. In a case where a touch panel is used as the input device  5161 , the touch panel may be provided on a display surface of the display device  5155 . 
     Alternatively, the input device  5161  is a device worn by a user, such as a glasses-type wearable device or a head mounted display (HMD), for example, and various inputs are performed in accordance with a user&#39;s gesture or line-of-sight detected by these devices. Furthermore, the input device  5161  includes a camera capable of detecting a movement of a user, and various inputs are performed in accordance with a user&#39;s gesture or line-of-sight detected from a video captured by the camera. Moreover, the input device  5161  includes a microphone capable of collecting a user&#39;s voice, and various inputs are performed by voice via the microphone. As described above, the input device  5161  has a configuration in which various types of information can be input in a non-contact manner, and this allows, in particular, a user belonging to a clean area (e.g., the operator  5181 ) to operate equipment belonging to an unclean area in a non-contact manner. Furthermore, the user can operate the equipment while holding a surgical tool in hand, and this improves convenience of the user. 
     A treatment tool control device  5163  controls driving of the energy treatment tool  5135  for cauterization or incision of tissue, sealing of a blood vessel, or the like. An insufflation device  5165  sends gas through the insufflation tube  5133  into the body cavity in order to inflate the body cavity of the patient  5185  for the purpose of securing a field of view of the endoscope  5115  and securing a working space for the operator. A recorder  5167  is a device that can record various types of information regarding surgery. A printer  5169  is a device that can print various types of information regarding surgery in various formats such as text, images, or graphs. 
     A particularly characteristic configuration of the endoscopic surgery system  5113  will be described below in more detail. 
     (Support Arm Device) 
     The support arm device  5141  includes the base portion  5143  as a base, and the arm  5145  extending from the base portion  5143 . In the illustrated example, the arm  5145  includes the plurality of joints  5147   a ,  5147   b , and  5147   c , and the plurality of links  5149   a  and  5149   b  coupled by the joint  5147   b . However,  FIG. 18  illustrates a configuration of the arm  5145  in a simplified manner for ease. In practice, the shapes, the numbers, and the arrangement of the joints  5147   a  to  5147   c  and the links  5149   a  and  5149   b , the directions of rotation axes of the joints  5147   a  to  5147   c , and the like can be appropriately set so that the arm  5145  has a desired degree of freedom. For example, the arm  5145  may suitably have a configuration that enables six or more degrees of freedom. With this arrangement, the endoscope  5115  can be freely moved within a movable range of the arm  5145 , and the lens barrel  5117  of the endoscope  5115  can be inserted into the body cavity of the patient  5185  from a desired direction. 
     The joints  5147   a  to  5147   c  are provided with actuators, and the joints  5147   a  to  5147   c  have a configuration that enables rotation about a predetermined rotation axis by driving of the actuators. The arm control device  5159  controls the driving of the actuators, thereby controlling a rotation angle of each of the joints  5147   a  to  5147   c , and controlling the driving of the arm  5145 . With this arrangement, the position and posture of the endoscope  5115  can be controlled. At this time, the arm control device  5159  can control the driving of the arm  5145  by various known control methods such as force control or position control. 
     For example, the position and posture of the endoscope  5115  may be controlled by the operator  5181  performing an appropriate operation input via the input device  5161  (including the foot switch  5171 ), thereby causing the arm control device  5159  to appropriately control the driving of the arm  5145  in accordance with the operation input. With this control, the endoscope  5115  at a distal end of the arm  5145  can be moved from an optional position to an optional position, and then fixedly supported at the position after the movement. Note that the arm  5145  may be operated by a so-called master-slave method. In this case, the arm  5145  can be remotely controlled by a user via the input device  5161  installed at a location away from an operating room. 
     Furthermore, in a case where the force control is applied, so-called power assist control may be performed in which the arm control device  5159  receives an external force from a user and drives the actuators of the corresponding joints  5147   a  to  5147   c  so that the arm  5145  moves smoothly in accordance with the external force. With this arrangement, when the user moves the arm  5145  while directly touching the arm  5145 , the arm  5145  can be moved with a relatively light force. Thus, the endoscope  5115  can be moved more intuitively and with a simpler operation, and this improves convenience of the user. 
     Here, in general, the endoscope  5115  has been supported by a doctor called an endoscopist during endoscopic surgery. On the other hand, by using the support arm device  5141 , the position of the endoscope  5115  can be fixed more securely without manual operation. This makes it possible to stably obtain an image of a surgical site and smoothly perform surgery. 
     Note that the arm control device  5159  is not necessarily provided at the cart  5151 . Furthermore, the arm control device  5159  is not necessarily one device. For example, the arm control devices  5159  may be provided one for each of the joints  5147   a  to  5147   c  of the arm  5145  of the support arm device  5141 , and a plurality of the arm control devices  5159  may cooperate with one another to control the driving of the arm  5145 . 
     (Light Source Device) 
     The light source device  5157  supplies the endoscope  5115  with emitted light at the time of imaging a surgical site. The light source device  5157  is constituted by a white light source including, for example, an LED, a laser light source, or a combination thereof. At this time, in a case where the white light source is constituted by a combination of RGB laser light sources, an output intensity and output timing of each color (each wavelength) can be controlled with high precision, and this enables white balance adjustment of a captured image at the light source device  5157 . Furthermore, in this case, an image for each of R, G, and B can be captured in a time-division manner by emitting laser light from each of the RGB laser light sources to an observation target in a time-division manner, and controlling driving of the imaging element of the camera head  5119  in synchronization with the emission timing. According to this method, a color image can be obtained without providing a color filter in the imaging element. 
     Furthermore, driving of the light source device  5157  may be controlled so that the intensity of light to be output changes at a predetermined time interval. By controlling the driving of the imaging element of the camera head  5119  in synchronization with the timing of the change in the light intensity, acquiring images in a time-division manner, and generating a composite image from the images, a high dynamic range image without so-called blocked up shadows or blown out highlights can be generated. 
     Furthermore, the light source device  5157  may have a configuration in which light can be supplied in a predetermined wavelength band that can be used for special light observation. In special light observation, for example, by utilizing wavelength dependence of light absorption in body tissue, so-called narrow band imaging is performed in which a predetermined tissue such as a blood vessel in a mucosal surface layer is imaged with high contrast by emitting light in a band narrower than that of light emitted during normal observation (that is, white light). Alternatively, in special light observation, fluorescence observation may be performed in which an image is obtained by fluorescence generated by emitting excitation light. In fluorescence observation, for example, excitation light is emitted to body tissue and fluorescence from the body tissue is observed (autofluorescence observation), or a fluorescent image is obtained by locally injecting a reagent such as indocyanine green (ICG) into body tissue and emitting excitation light corresponding to a fluorescence wavelength of the reagent to the body tissue. The light source device  5157  may have a configuration in which narrow-band light and/or excitation light that can be used for such special light observation can be supplied. 
     (Camera Head and CCU) 
     Functions of the camera head  5119  of the endoscope  5115  and the CCU  5153  will be described in more detail with reference to  FIG. 19 .  FIG. 19  is a block diagram illustrating an example of a functional configuration of the camera head  5119  and the CCU  5153  illustrated in  FIG. 18 . 
     Referring to  FIG. 19 , the camera head  5119  has functions including a lens unit  5121 , an imaging unit  5123 , a driving unit  5125 , a communication unit  5127 , and a camera head control unit  5129 . Furthermore, the CCU  5153  has functions including a communication unit  5173 , an image processing unit  5175 , and a control unit  5177 . The camera head  5119  and the CCU  5153  are connected by a transmission cable  5179  to allow two-way communication. 
     First, the functional configuration of the camera head  5119  will be described. The lens unit  5121  is an optical system provided at a connection with the lens barrel  5117 . Observation light taken in from the distal end of the lens barrel  5117  is guided to the camera head  5119  and enters the lens unit  5121 . The lens unit  5121  is constituted by a combination of a plurality of lenses including a zoom lens and a focus lens. Optical characteristics of the lens unit  5121  are adjusted so that observation light may be collected on a light receiving surface of an imaging element of the imaging unit  5123 . Furthermore, the zoom lens and the focus lens have a configuration in which their positions can be moved on an optical axis for adjustment of a magnification and a focus of a captured image. 
     The imaging unit  5123  includes the imaging element, and is arranged at a stage subsequent to the lens unit  5121 . Observation light that has passed through the lens unit  5121  is collected on the light receiving surface of the imaging element, and an image signal corresponding to an observation image is generated by photoelectric conversion. The image signal generated by the imaging unit  5123  is provided to the communication unit  5127 . 
     As the imaging element included in the imaging unit  5123 , for example, a complementary metal oxide semiconductor (CMOS) type image sensor that has a Bayer array and can capture a color image is used. Note that, as the imaging element, an imaging element capable of capturing a high-resolution image of, for example, 4K or more may be used. An image of a surgical site can be obtained with a high resolution, and this allows the operator  5181  to grasp the state of the surgical site in more detail, and proceed with surgery more smoothly. 
     Furthermore, the imaging element included in the imaging unit  5123  has a configuration including a pair of imaging elements, one for acquiring a right-eye image signal and the other for acquiring a left-eye image signal supporting 3D display. The 3D display allows the operator  5181  to grasp the depth of living tissue in the surgical site more accurately. Note that, in a case where the imaging unit  5123  has a multi-plate type configuration, a plurality of the lens units  5121  is provided for the corresponding imaging elements. 
     Furthermore, the imaging unit  5123  is not necessarily provided in the camera head  5119 . For example, the imaging unit  5123  may be provided inside the lens barrel  5117  just behind the objective lens. 
     The driving unit  5125  is constituted by an actuator, and the camera head control unit  5129  controls the zoom lens and the focus lens of the lens unit  5121  to move by a predetermined distance along the optical axis. With this arrangement, the magnification and the focus of an image captured by the imaging unit  5123  can be appropriately adjusted. 
     The communication unit  5127  is constituted by a communication device for transmitting and receiving various types of information to and from the CCU  5153 . The communication unit  5127  transmits an image signal obtained from the imaging unit  5123  as raw data to the CCU  5153  via the transmission cable  5179 . At this time, it is preferable that the image signal be transmitted by optical communication in order to display a captured image of a surgical site with a low latency. This is because, during surgery, the operator  5181  performs surgery while observing a state of an affected part from a captured image, and it is required that a moving image of the surgical site be displayed in real time as much as possible for safer and more reliable surgery. In a case where optical communication is performed, the communication unit  5127  is provided with a photoelectric conversion module that converts an electric signal into an optical signal. An image signal is converted into an optical signal by the photoelectric conversion module, and then transmitted to the CCU  5153  via the transmission cable  5179 . 
     Furthermore, the communication unit  5127  receives a control signal for controlling driving of the camera head  5119  from the CCU  5153 . The control signal contains information regarding imaging conditions such as information for specifying a frame rate of a captured image, information for specifying an exposure value at the time of imaging, and/or information for specifying a magnification and focus of the captured image. The communication unit  5127  provides the received control signal to the camera head control unit  5129 . Note that the control signal from the CCU  5153  may also be transmitted by optical communication. In this case, the communication unit  5127  is provided with a photoelectric conversion module that converts an optical signal into an electric signal. The control signal is converted into an electric signal by the photoelectric conversion module, and then provided to the camera head control unit  5129 . 
     Note that the imaging conditions such as the frame rate, the exposure value, the magnification, and the focus described above are automatically set by the control unit  5177  of the CCU  5153  on the basis of an acquired image signal. That is, the endoscope  5115  has a so-called auto exposure (AE) function, an auto focus (AF) function, and an auto white balance (AWB) function. 
     The camera head control unit  5129  controls the driving of the camera head  5119  on the basis of the control signal from the CCU  5153  received via the communication unit  5127 . For example, the camera head control unit  5129  controls driving of the imaging element of the imaging unit  5123  on the basis of information for specifying a frame rate of a captured image and/or information for specifying exposure at the time of imaging. Furthermore, for example, the camera head control unit  5129  appropriately moves the zoom lens and the focus lens of the lens unit  5121  via the driving unit  5125  on the basis of information for specifying a magnification and a focus of a captured image. The camera head control unit  5129  may further include a function of storing information for recognizing the lens barrel  5117  and the camera head  5119 . 
     Note that, by arranging the configurations of the lens unit  5121 , the imaging unit  5123 , and the like in a hermetically sealed structure having high airtightness and waterproofness, the camera head  5119  can have resistance to autoclave sterilization. 
     Next, the functional configuration of the CCU  5153  will be described. The communication unit  5173  is constituted by a communication device for transmitting and receiving various types of information to and from the camera head  5119 . The communication unit  5173  receives an image signal transmitted from the camera head  5119  via the transmission cable  5179 . At this time, as described above, the image signal can be suitably transmitted by optical communication. In this case, to support optical communication, the communication unit  5173  is provided with a photoelectric conversion module that converts an optical signal into an electric signal. The communication unit  5173  provides the image processing unit  5175  with the image signal converted into an electric signal. 
     Furthermore, the communication unit  5173  transmits a control signal for controlling the driving of the camera head  5119  to the camera head  5119 . The control signal may also be transmitted by optical communication. 
     The image processing unit  5175  performs various types of image processing on an image signal that is raw data transmitted from the camera head  5119 . Examples of the image processing include various types of known signal processing such as development processing, high image quality processing (such as band emphasis processing, super-resolution processing, noise reduction (NR) processing, and/or camera shake correction processing), and/or enlargement processing (electronic zoom processing). Furthermore, the image processing unit  5175  performs demodulation processing on the image signal for performing AE, AF, and AWB. 
     The image processing unit  5175  is constituted by a processor such as a CPU or a GPU, and the image processing and demodulation processing described above can be performed by the processor operating in accordance with a predetermined program. Note that, in a case where the image processing unit  5175  is constituted by a plurality of GPUs, the image processing unit  5175  appropriately divides information related to the image signal, and image processing is performed in parallel by the plurality of GPUs. 
     The control unit  5177  performs various controls regarding capturing of an image of a surgical site by the endoscope  5115  and display of the captured image. For example, the control unit  5177  generates a control signal for controlling the driving of the camera head  5119 . At this time, in a case where imaging conditions have been input by a user, the control unit  5177  generates a control signal on the basis of the input by the user. Alternatively, in a case where the endoscope  5115  has an AE function, an AF function, and an AWB function, the control unit  5177  appropriately calculates an optimal exposure value, focal length, and white balance in accordance with a result of demodulation processing performed by the image processing unit  5175 , and generates a control signal. 
     Furthermore, the control unit  5177  causes the display device  5155  to display an image of a surgical site on the basis of an image signal on which the image processing unit  5175  has performed image processing. At this time, the control unit  5177  uses various image recognition technologies to recognize various objects in the image of the surgical site. For example, the control unit  5177  can recognize a surgical tool such as forceps, a specific living body site, bleeding, mist at the time of using the energy treatment tool  5135 , and the like by detecting a shape, color, and the like of an edge of an object in the image of the surgical site. When the image of the surgical site is displayed on the display device  5155 , the control unit  5177  superimposes various types of surgery support information upon the image of the surgical site using results of the recognition. The surgery support information is superimposed and presented to the operator  5181 , and this allows surgery to be performed more safely and reliably. 
     The transmission cable  5179  connecting the camera head  5119  and the CCU  5153  is an electric signal cable that supports electric signal communication, an optical fiber cable that supports optical communication, or a composite cable thereof. 
     Here, in the illustrated example, wired communication is performed using the transmission cable  5179 , but wireless communication may be performed between the camera head  5119  and the CCU  5153 . In a case where wireless communication is performed between the two, the transmission cable  5179  does not need to be laid in the operating room. This may resolve a situation in which movement of medical staff in the operating room is hindered by the transmission cable  5179 . 
     The example of the operating room system  5100  to which the technology according to the present disclosure can be applied has been described above. Note that, here, a case where a medical system for which the operating room system  5100  is used is the endoscopic surgery system  5113  has been described as an example, but the configuration of the operating room system  5100  is not limited to such an example. For example, the operating room system  5100  may be used for a flexible endoscope system for examination or a microscopic surgery system instead of the endoscopic surgery system  5113 . 
     The present technology can be applied to the display devices  5103 A to  5103 D installed at corresponding places in the operating room among the above-described components. By applying the present technology to the display devices  5103 A to  5103 D, advance information for making a variety of advance preparations is presented in a mode corresponding to an operator who checks a surgical site image (each of the display devices  5103 A to  5103 D). 
     For example, with a specific scene in a surgical site image as a trigger, advance information for an anesthesiologist to make an advance preparation is presented on a mobile terminal such as a smartphone carried by the anesthesiologist or a monitor of a display device for the anesthesiologist. 
     The above-described example can be applied to a case where the anesthesiologist is present throughout the surgery, a case where the anesthesiologist takes part in a plurality of surgeries, and the like. The monitor checked by the anesthesiologist presents, as advance information, information regarding a surgical scene and a remaining time of the surgery. Furthermore, as advance information, a notification of a timing at which determination by the anesthesiologist is necessary may be given on the basis of values of vital signs displayed on an anesthesia machine, a breathing device, a patient monitor, or the like. 
     Furthermore, with a specific scene in a surgical site image as a trigger, advance information for a nurse to perform treatment after a certain period of time has passed may be presented on a monitor checked by the nurse. 
     The above-described example can be applied to, for example, a case where hepatectomy is performed in liver cancer surgery. The monitor checked by the nurse presents, as advance information, a timing to block/unblock blood flow to the liver, for example, block blood flow for 15 minutes and unblock blood flow for 5 minutes. Conventionally, a nurse has managed time during surgery by measuring time with a timer or the like. According to the present technology, it is possible to accurately manage time without error in time measurement. 
     Moreover, with a specific scene in a surgical site image as a trigger, a type of a surgical instrument that needs to be replaced and the timing to replace the surgical instrument may be presented as advance information on the monitor checked by the nurse. For example, with a specific scene in a surgical site image as a trigger, advance information regarding a suture needle and a suture thread that need to be prepared is presented on a monitor checked by a scrub nurse. Since the suture needle needs to be threaded with the suture thread in advance as a preparation, the scrub nurse can smoothly make the preparation with such advance information. 
     In a similar manner, with a specific scene in a surgical site image as a trigger, advance information regarding surgical instruments and hygienic materials that need to be prepared, such as forceps, an electric scalpel, a drain, and gauze, can be presented on the monitor checked by the scrub nurse. 
     Furthermore, with a specific scene in a surgical site image as a trigger, advance information for operating a camera in association with a step in a surgical procedure may be presented on a monitor checked by an operator who operates the camera. 
     The above-described example can be applied to, for example, a case where a surgical site is zoomed in and imaged when tissue around the surgical site is grasped with forceps and the surgical site is excised or exfoliated while the entire surgical site is imaged in a bird&#39;s eye view. For example, with a specific scene in a surgical site image as a trigger, advance information regarding preparation of forceps, an electric scalpel, a drain, and the like and adjustment of an intraperitoneal pressure is presented in accordance with the surgical procedure on a monitor checked by an assistant. Advance information for giving an instruction to pan, tilt, or zoom an endoscope may be presented on a monitor checked by an endoscopist. 
     Embodiments of the technology according to the present disclosure are not limited to the embodiment described above but can be modified in various ways within a scope of the present technology according to the present disclosure. 
     Furthermore, the effects described herein are merely illustrative and are not intended to be restrictive, and other effects may be obtained. 
     Moreover, the technology according to the present disclosure may have the following configurations. 
     (1) 
     A video processing apparatus including: 
     a presentation control unit that controls, in such a way that, with a first scene of a captured video currently being captured used as a reference, advance information regarding a second scene is presented at a presentation timing before the second scene after the first scene, in a mode corresponding to an output destination of the captured video, the presentation of the advance information. 
     (2) 
     The video processing apparatus according to (1), in which 
     the presentation control unit controls superimposition of the advance information on the captured video. 
     (3) 
     The video processing apparatus according to (1) or (2), in which 
     the advance information is information that prompts a user corresponding to the output destination to perform an operation for the second scene. 
     (4) 
     The video processing apparatus according to (3), in which 
     the advance information is information for presenting, to the user, a change in metadata of the captured video in the second scene. 
     (5) 
     The video processing apparatus according to (4), in which 
     the advance information is display information that includes at least one of a character, a symbol, or a figure. 
     (6) 
     The video processing apparatus according to any one of (1) to (5), in which 
     the presentation timing of the advance information is set to a different timing for each of the output destinations. 
     (7) 
     The video processing apparatus according to any one of (1) to (6), further including: 
     an advance information generation unit that generates the advance information on the basis of metadata starting from the first scene in a recorded video captured in advance corresponding to the captured video. 
     (8) 
     The video processing apparatus according to (7), in which 
     the advance information generation unit further generates the advance information on the basis of video data starting from the first scene in the recorded video. 
     (9) 
     The video processing apparatus according to (8), in which 
     the advance information generation unit identifies the second scene by analyzing the metadata or the video data starting from the first scene in the recorded video. 
     (10) 
     The video processing apparatus according to (9), in which 
     the advance information generation unit obtains the presentation timing on the basis of a time of the second scene identified after the first scene in the recorded video. 
     (11) 
     The video processing apparatus according to (10), in which 
     the presentation control unit compares the captured video with the recorded video to control presentation of the advance information in such a way that the advance information is presented at the presentation timing. 
     (12) 
     The video processing apparatus according to (11), in which 
     the presentation control unit compares metadata starting from the first scene in the captured video with the metadata starting from the first scene in the recorded video. 
     (13) 
     The video processing apparatus according to (12), in which 
     the presentation control unit compares time codes starting from the first scene in the captured video with time codes starting from the first scene in the recorded video. 
     (14) 
     The video processing apparatus according to (12) or (13), in which 
     the presentation control unit further compares video data starting from the first scene in the captured video with the video data starting from the first scene in the recorded video. 
     (15) 
     The video processing apparatus according to any one of (7) to (14), in which 
     the metadata includes at least one of time information, a camera parameter, information regarding a posture of a camera, a position of the camera, or sound information. 
     (16) 
     The video processing apparatus according to any one of (7) to (15), in which 
     the presentation control unit controls presentation of one or a plurality of representative frame images included in a range from the first scene to the second scene in the recorded video in accordance with the output destination, in addition to the advance information. 
     (17) 
     The video processing apparatus according to any one of (1) to (16), further including: 
     an output unit that outputs the advance information in a mode corresponding to the output destination to a display device serving as the output destination. 
     (18) 
     The video processing apparatus according to (1), in which 
     the presentation control unit displays, on a monitor, the advance information in a mode corresponding to the output destination. 
     (19) 
     The video processing apparatus according to (18), in which 
     the presentation control unit displays, on the monitor, the advance information in a mode corresponding to the output destination selected in accordance with a selection operation by a user selecting the output destination. 
     (20) 
     A video processing method including: 
     controlling, by a video processing apparatus, in such a way that, with a first scene of a captured video currently being captured used as a reference, advance information regarding a second scene is presented at a presentation timing before the second scene after the first scene, in a mode corresponding to an output destination of the captured video, the presentation of the advance information. 
     REFERENCE SIGNS LIST 
     
         
           10  Camera 
           11  Memory 
           12  Imaging unit 
           13  Video processing unit 
           14  Output unit 
           15  Advance information generation unit 
           16  Metadata generation unit 
           17  Presentation control unit 
           18  Superimposition unit 
           19  Recording unit 
           110  Display device 
           111  I/F unit 
           112  Input unit 
           113  Presentation control unit 
           114  Monitor