JP2002344897A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a video display device capable of deciding that a video is not displayed on a screen resulting from no existence of video data and preventing useless time from being spent by keeping observing a section with no video data without knowing that the video data do not exist. SOLUTION: A first display means 21 for synchronously reproducing many pieces of camera video data 10 photographed by a plurality of cameras and subjected to time synchronization with one another on the basis of photographing times, and a second display means 22 for displaying time sections of the video data photographed with the respective cameras are provided, and the first and second display means are interlocked with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device for synchronously reproducing a multi-camera video taken by a plurality of cameras and time-synchronized with each other based on a shooting time.
For example, the present invention relates to an image display device used for monitoring a plant or a road, broadcasting a sport or a festival, and the like.

[0002]

2. Description of the Related Art FIGS. 6 to 9 show, for example, (Hata et al., "Browsing method of multi-view video using importance of video and map", IPSJ Database System Research Group Research Report, 119-36, pp. 146-64). 213-218) is a diagram for explaining the conventional video display device shown in FIG. 6, FIG. 6 is a block diagram showing the configuration of the conventional video display device, and FIG. 7 is a diagram showing first multi-camera video data and second video data. FIG. 8 is a diagram illustrating a layout of a display screen of a conventional video display device, and FIG. 9 is a diagram illustrating a problem in display. In FIG. 6, reference numeral 1 denotes element data including information such as the event 1a and the object 1b. Reference numeral 2 denotes first multi-camera video data captured by a plurality of cameras and time-synchronized with each other, and includes attribute data 2b such as a shooting time and a shooting location (shooting range), and video entity data 2a. Reference numeral 3 denotes search means for searching for and outputting video data meeting the conditions from the first multi-camera video data 2 at the request of the interactive means 6. Reference numeral 4 denotes second multi-camera video data, which is a subset of the first video data output by the search means 3, and attribute data 4b such as a shooting time and a shooting location.
And video entity data 4a. Reference numeral 5 denotes map data, and reference numeral 6 denotes an interactive means for performing interactive processing with a user (a user of the video display device). Reference numeral 7 denotes display means, which is an image display means 7a for displaying the second multi-camera image data 4 and map data 5
And a map display means 7b for displaying Reference numeral 8 denotes a display device for displaying a screen.

[0005] In FIG. 8 showing a display screen, reference numeral 140 denotes a video window, which is superimposed on the map 55 and displayed. 151 and 152 are scroll bars, and 160 is a play button.

The first multi-camera video data 2 includes entity data 2a which is a time-series set of image frames, a shooting time indicating when each image frame was shot, and a shooting range indicating where the image frame was shot. Attribute data 2b
And transmitted or stored in association with each other. The shooting range is GPS (Global Position)
This can be obtained by geometric calculation using camera data such as camera position data obtained from, for example, the Ning System, and camera data such as the direction, shooting direction (pan, tilt), and zoom output from the camera itself. The element data 1 is data including information on an object such as a building existing in a target area or an event such as traffic congestion or a fire occurrence. The object data 1b has an object name or position data and the like. The data 1a includes the type of event, the time when the event occurred, and position data.

Next, a search operation will be described with reference to FIG. FIG. 7A shows the first multi-camera video data,
(B) shows the second multi-camera video data, in which the time section is represented by a line segment and the event type is En
(N is a natural number). The user specifies an element or a time section to be viewed by the interactive means 6. For example, from the first multi-camera video data 2, a time section [Ts, Te]
In the following, a description will be given of a case where a video section in which an event of type E1 occurred in step (1) is extracted. The search unit 3 that has received the search request uses the data related to the position and time of the element data 1 and the attribute data 2b of the video. By calculating which element each video section captures, second multi-camera video data as shown in FIG. 7B is obtained and output.

[0008] As shown in FIG. 8, the map display means 7 b
A map of an area designated by the user via the interactive means 6 such as scrolling or changing the scale is displayed. Image display means 7
a shows that the second multi-camera image data 4 is displayed on the map 55 near each camera and the photographing range in the image window 140.
Is superimposed. Therefore, as shown in FIG. 9A, when video data corresponding to the shooting time being reproduced exists in the display area 101 of the map, the video is displayed on the map, but as shown in FIG. 9B. As described above, even if video data corresponding to the shooting time during reproduction exists in the entire area 100 of the map, video data for capturing that area does not exist depending on the range of the displayed map (display area 101). Video may not be displayed on the map. Also, when the reproduction mode is selected, the time may elapse without changing the screen even in a section where no video data exists.

[0007]

The conventional image display apparatus is constructed as described above, and superimposes a map enlarging a part of the monitoring area and an image showing the map area, and further satisfies the search request. Since the playback process is continued even when there is no section, if no image is displayed on the screen,
If it is impossible to determine whether there is no video data that satisfies the search request or only video data that captures the displayed map area does not exist, and if there is a long period where no video data exists, There were problems such as wasting time on observing the whole.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art. When an image is not displayed on a screen, it can be determined whether or not image data does not exist at all. It is an object of the present invention to provide a video display device capable of preventing useless time from being continuously observed without knowing a section having no video data.

[0009]

According to the present invention, there is provided an image display apparatus comprising: first display means for synchronously reproducing multi-camera image data shot by a plurality of cameras and time-synchronized with each other based on a shooting time; And a second display means for displaying a time section of the video data photographed in step (1), wherein the first display means and the second display means are interlocked.

Also, there is provided first display means for synchronously reproducing multi-camera video data taken by a plurality of cameras and time-synchronized with each other based on the shooting time, and the first display means is provided with any of the above cameras. In this case, synchronous playback is performed by skipping a section in which no video data exists.

Also, there is provided first display means for synchronously reproducing multi-camera video data taken by a plurality of cameras and time-synchronized with each other based on the photographing time, and the first display means is provided by any of the above cameras. In the section where no video data exists, synchronous reproduction is performed by explicitly indicating that no video data exists.

Further, from among the first multi-camera video data shot by a plurality of cameras and time-synchronized with each other, video data satisfying a given condition is searched for and output as second multi-camera video data. A search means is provided, and the first display means reproduces the second multi-camera video data synchronously based on the shooting time.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1
FIG. 3 is a diagram for explaining the video display device according to the first embodiment of the present invention. More specifically, FIG. 1 is a block diagram showing the configuration of the video display device, and FIG. FIG. 3 is a diagram illustrating an example, and FIG. 3 is a diagram illustrating another example of a layout of a display screen. In FIG. 1, reference numeral 10 denotes multi-camera video data captured by a plurality of cameras and time-synchronized with each other; 21, first display means (video display means) for synchronously reproducing the multi-camera video data based on the shooting time; Second to display time section of video data shot by each camera
And display device 8 such as a CRT (Cathode Ray Tube) monitor for displaying a screen.

The multi-camera video data 10 is composed of video entity data 10a, which is a time-series set of image frames, and attribute data 10b including at least a shooting time indicating when each image frame was shot. It is transmitted from the shooting site in association with it, or recorded and stored on a hard disk, an optical disk, or the like. Display means 21, 22
Is realized by a software program mounted on a computer having a graphics function, such as a personal computer or a workstation, or by combining this with a video reproduction board that realizes real-time moving image reproduction by hardware.

FIG. 2 shows an example of a layout of a display screen displayed on the display device 8. In FIG. 2, reference numeral 40 denotes an image display area; 41, a window for displaying an image captured by the camera i; 42, a window for displaying an image captured by the camera j;
Thus, a plurality of video windows are synchronously reproduced. FIG.
Shows an example in which video windows 41 and 42 captured by two cameras, i and j, are synchronously reproduced. 43 is a background. Also, 50 is a shooting time display area, 51 is a bar showing the time during playback, 52 is a bar showing the time section in which each video was shot, 53 is a time axis, and 54 is a camera name. The shooting time section is displayed for each camera by the time section display means 22, and in the example of FIG. 2, the shooting time section 52 of the camera i and the camera j is displayed on a graph with the shooting time as the axis 53. The current video playback time is indicated by a bar 51 on the graph.

Next, the operation will be described. The video display means 21 synchronizes and displays the video entity data 10a of the multiple cameras on the display device 8 based on the shooting time, and the time section display means 22 extracts the shooting time information from the attribute data 10b and displays it on the display device 8. . At this time, the video display means 21 and the time section display means 22 display the update of the display video and the movement of the bars 51 and 52 on the graph in association with each other based on the shooting time information.

In the present embodiment, since the shooting time of an image can be ascertained for each camera, when a certain image window is not displayed or when the display is not updated, whether there is simply no image data or the system It can be determined at a glance whether the cause is another cause such as a defect such as a defect. Further, since the display contents of the video window and the bar on the graph are linked, the current video playback time can be easily known from the bar on the graph.

In FIG. 2, the background 43 is a map,
The video is associated with the shooting location by a method such as superimposing the video windows 41 and 42 near each camera or shooting range on the map, or drawing a drop-in line from the video windows 41 and 42 to the shooting location on the map. Thereby, the multi-camera video can be synchronously reproduced and displayed while being aware of the shooting location and shooting time of each camera. FIG. 3 shows an example of this display screen. In FIG. 3, reference numeral 55 denotes a map displayed in the video display area 40. Such superimposed display of the video windows 41 and 42 on the map 55 can be realized in the same manner as described in the related art by including the shooting range as the attribute data 10b and providing the map data and the map display means. .

As a method of arranging the image windows, a method of arranging the image windows in a matrix shape arranged regularly and vertically, a method of arranging the image windows in association with the photographing position on the map based on the photographing position as described above, or CG As in the case of a map, a method of arranging images in a three-dimensional space constituted by (computer graphics) or the like in association with a shooting position can be considered. This is the same in each of the following embodiments, although not particularly specified.

During the synchronous reproduction display of the video, there is a case where there is no video data in some video windows at a certain time. At this time, there are several ways to display the image in the image window.For example, the last displayed image can be kept displayed, or a monotone color image such as blue or black can be displayed. There is a display method in which the video window is displayed only when there is display data, and the video window is closed or reduced when there is no display data. This is the same in each of the following embodiments, although not particularly specified.

The shooting time display area 50 (graph) in FIGS. 2 and 3 can be displayed in various ways. For example, a method of expressing the shooting time zone (time section) only by the start time and end time of shooting, displaying the shooting start time and end time in numerical values on a graph, and displaying scales in the shooting time zone are also conceivable. . Further, when there is a bias in the photographing time, the time axis 53 of the graph may be represented by a non-linear increase, or may be a deformed one that is partially represented. The time axis 53 of the graph may be composed of, for example, the oldest time and the latest time of the photographing time, for example, 13:00.
It may be a fixed time axis width such as ~ 14: 00. It is also conceivable to determine the time axis width based on a certain focused shooting time section. Further, instead of displaying the shooting time zones of a plurality of cameras on one graph, a graph may be displayed for each camera. In this case, the graphs are displayed side by side at a certain place, or displayed around the corresponding video window. In FIGS. 2 and 3, the vertical axis of the graph uses the camera name 54. However, instead of the camera name, meta information such as a shooting location, a shooting angle, a photographer, a subject, and a video title or a video window is used. Is also good. Further, in FIGS. 2 and 3, the bar 51 is used as an indicator indicating the video reproduction time, but various things can be considered. For example, a time cursor may be provided for each shooting time zone, and the time cursor may move, or the shooting time zone may partially flash or change color. Also, instead of the indicator, the video window may move on the graph. Alternatively, the indicator may be stationary, and the shooting time zone and the time axis may scroll more. Further, the shooting time section may be simply displayed as a numerical value instead of a graph.

The positional relationship between the video window and the graph may be a predetermined positional relationship or may be set by a user operation.

The operation method of the video reproduction time is as follows.
There may be a button for operating the playback time, or a method of seeking by operating the indicator on the graph by dragging the mouse or the like can be considered.

The image display means 21 and the time section display means 22 can be linked in two ways: one is operated and the other is also linked to synchronize the time. When both are linked, for example, when the video time is manipulated, the time is graphically and numerically changed and displayed on the graph according to the synchronized playback of the video, and the video is sought by moving the indicator such as the cursor of the graph. Or
It is conceivable that fast-forward display is performed.

Embodiment 2 4 to 6 are views for explaining an image display device according to the second embodiment of the present invention. More specifically, FIG. 4 is a block diagram showing the configuration of the image display device, and FIG. FIG. 5 is a diagram for explaining multi-camera video data and second multi-camera video data. In FIG. 4, reference numeral 2 denotes first multi-camera video data captured by a plurality of cameras and time-synchronized with each other, and includes attribute data 2b such as a shooting time and a shooting location (shooting range), and video entity data 2a. Reference numeral 3 denotes search means for searching the first multi-camera video data 2 for video data that satisfies a given condition in response to a request from the interactive means 6, and outputting the video data as second multi-camera video data. Reference numeral 4 denotes second multi-camera video data, which is a subset of the first video data output by the search means 3, and includes attribute data 4 such as a shooting time and a shooting location.
b and the video entity data 4a. Reference numeral 70 denotes first display means for synchronously reproducing the second multi-camera video data 4 based on the shooting time, and no video data exists (no video data captured by any camera satisfying the search condition). Synchronous playback skips sections. Reference numeral 8 denotes a display device such as a CRT monitor for displaying a screen.

Similar to the first embodiment, the first multi-camera video data 2 includes video entity data 2a, which is a time-series set of image frames, and an attribute including at least a shooting time indicating when each image frame was shot. The data 2b is transmitted from the shooting site in association with each other, or recorded and stored on a hard disk, an optical disk, or the like. The first display means 70 is realized by a software program mounted on a computer having a graphics function such as a personal computer or a workstation, or a combination of the software program with a video reproduction board for real-time video reproduction by hardware. Is realized.

Next, the operation will be described. The search means 3 searches the first multi-camera video data 2 for video data that satisfies the search condition, and searches for the second multi-camera video data 4.
Is extracted (output). At this time, the search condition is automatically set inside the video display device, or is determined by the user explicitly instructing by operating the interactive means (not shown) similar to the related art. In FIG. 5, video data in a time section [Ts, Te] is searched from first multi-camera video data (FIG. 5A) which is a set of video data of multiple cameras, and a second video data is searched for. Multi-camera video data (Fig. 5
An example of extracting as (b)) is shown. This search is
This is performed by comparing the shooting time of each frame with the time range of the search condition. In FIG. 5, the time section of the video data captured by each of the cameras i, j, k,... Is represented by a line segment.

The first display means 70 synchronizes the second multi-camera video data 4 with reference to the photographing time, and displays a video at a display position corresponding to each camera. At this time, the first display means 70 manages the photographing time of the second multi-camera video data 4, and if there is a time section in which no video data exists, the first display means 70 shifts the time until the next video data exists. Then (skip) and play back synchronously. For example, FIG.
When synchronously playing back the second multi-camera video data as shown in (1), if the playback time reaches Ta, there is no video frame to be displayed next, so playback is performed until time Tb when some video data exists next. Advances (shifts) the time and continues playback. Also, since there is no video frame to be displayed next at the reproduction time Tc, the reproduction time is advanced (shifted) to the next time Td at which some video data exists, and the reproduction is continued.

That is, in the case of FIG. 5B, first,
The video of the camera i, j, and k is synchronously reproduced from the reproduction time Ts, and then the video of the camera j is reproduced independently for a while after the video data of the camera i and k disappears, and the reproduction time Tb
When the time when the camera i is shot after passing, the video of the camera i and the video of the camera j are synchronously reproduced and displayed.
Thereafter, when the video data of the camera j runs out, the reproduction time T
Only the image of camera i is reproduced and displayed up to c. Similarly, at the playback time Tc, the playback time is advanced (shifted) to Td and the playback is continued, so that the single video of the camera i is switched to the single video of the camera j, and the time when the camera k is shot is approached. The video of the camera j and the video of the camera k are synchronously reproduced and displayed.

As described above, in the present embodiment, the first display means 70 reproduces the image data by skipping the time section in which no video data exists at all (by shifting the time), thereby providing the section in which no video data exists. It is possible to prevent wasting time by continuing to observe, and when no image is displayed on the screen, it can be determined that there is another cause, not because there is no image data.

The layout of the display screen of the video data in the present embodiment is the same as the layout of the video display area 40 in FIG. 2, for example. By the first display means 70,
A plurality of video windows are played back synchronously. It is conceivable that the background is a map and the video and the shooting location are associated with each other and synchronously reproduced and displayed by the same method as in FIG. 3 of the first embodiment. In this way, when the background is a map,
In the related art, as described with reference to FIG. 9B, although there is video data that satisfies the search request, depending on the range (display area) of the map to be displayed, video data that captures that area may not be available. There is a case where no video is displayed on the map because it does not exist, and there is a problem that it cannot be determined whether there is no video data or only there is no video data that captures the displayed map area. On the other hand, in the present embodiment, the first display means 70 skips the time section in which no video data exists at all and reproduces the video data, so that when the video is not displayed on the screen, the video data is displayed. It can be determined that there is another cause (just that there is no video data depicting the displayed map area), not because it does not exist at all. Also, for example, by searching for only the video displayed on the display map, since only the video on the display map and a certain time section with video data are reproduced, the conventional technology that no video is displayed on the map is used. The problem can be solved.

The general search conditions in the search means include a shooting time section, a shooting range, a camera or a group of cameras, a shooting subject, a type of video shooting trigger, an annotation, a scene change, and their AND, OR combinations are possible. For example, when a photographic subject is searched as a search condition and only the corresponding video is displayed, only the video of the target subject is continuously displayed in the present embodiment, and tracking of a moving object or a target object can be easily performed. The effect of being able to perform is obtained. In addition, a search based on a shooting time under a certain condition, such as a time search based on the shooting time of a specific camera or a group of cameras or a time search based on the shooting time of a certain subject, can be considered. The search based on the shooting subject, the trigger type, and the annotation is realized by, for example, the presence of a database such as the element data described in the related art that manages the shooting object, event, and annotation separately in association with the video section. The same applies to the third embodiment described later, although not particularly specified.

Further, when a time period in which there is no video at all is time-shifted and reproduced, it is possible to prevent the user from being confused by explicitly notifying the user of the shift.
As a way of specifying, a magnified display of the video window, a highlighted display such as a change in the color of the edge of the window, a message display indicating the shift, a sound, or the like can be considered. Also, as in the first embodiment, by specifying the shooting time (time section of a video) on a display screen by a graph or the like, it is possible to know in which section the video data is present, so that the occurrence of a time shift can be predicted. Therefore, confusion of the user can be reduced. Also, a semi-automatic time shift that skips a time section after a user's confirmation is considered is also conceivable.

The video display apparatus according to the present embodiment is used, for example, when searching for desired video data from a video database, or when working on a multimedia document or a search result including video on a terminal and playing back interactively. It can be used particularly effectively.

Embodiment 3 FIG. The configuration of the video display device according to the third embodiment of the present invention is the same as that of FIG. Next, the operation will be described with emphasis on the difference from the second embodiment. The search means 3 searches the first multi-camera video data 2 for video data that satisfies the search condition, and extracts (outputs) the second multi-camera video data 4 as in the second embodiment. It is. At this time, the search condition is automatically set within the video display device, or is determined by the user explicitly instructing by operating the same interactive means (not shown) as in the prior art. This is the same as in the second embodiment. The first display unit 70 synchronizes the second multi-camera video data 4 with reference to the shooting time, and displays a video at a display position corresponding to each camera. At this time, the first display means 70 manages the photographing time of the second multi-camera video data 4, and no video data exists (no video data captured by any camera satisfying the search condition). If there is a time section, the fact that there is no video is displayed to the user by displaying a dialog or the like or sounding. This allows the user to recognize a time section having no video at all, so that the user can fast-forward and skip that section, or seek to the next time at which video data is present, and efficiently observe the video. .

As described above, in the present embodiment, the first display means 70 reproduces a time section in which no video data exists at all by explicitly indicating to the user that video data does not exist. If no video is displayed, the user can determine whether or not there is no video data at all, and can avoid wasting time by continuing to observe without knowing a section without video data at all. .

As in the first and second embodiments,
It is conceivable that the video and the shooting location are associated with each other and displayed synchronously. As described above, in the related art, when the video is superimposed on the map, as described with reference to FIG. 9B, whether the video is not displayed because there is no corresponding video data, or the video window is displayed. There is a problem that it is impossible to determine whether or not an image is not displayed due to a layout problem to be displayed. On the other hand, in the present embodiment, the first display means 70 synchronously reproduces a section in which no video data exists at all by explicitly indicating that no video data exists, so that the user can be prevented from being confused. There is.

As a method of clearly indicating a time period in which no video is displayed, for example, a reduced display of a video window, a highlighted display in which the color of a window is changed, a message display notifying that no video data is present, and a sound are considered. Can be Also, as in the first embodiment, specifying a shooting time (a time section of a video) by a graph or the like on the display screen allows the user to know in which section the video data is present, and similar effects can be obtained.

In the second and third embodiments, the retrieval means 3 is provided, and the first display means 70 reproduces the second multi-camera video data 4 which satisfies the given conditions in synchronization with the photographing time. As described in the first embodiment, when all of the first multi-camera video data 2 are synchronously reproduced, a section in which no video data exists at all is skipped, or synchronous reproduction is performed. Synchronous playback may be performed by explicitly indicating that no video data exists. In these cases, if no video is displayed on the screen, it can be determined whether or not video data does not exist at all, and there is no video data. By observing the section without knowing the section, it is possible to prevent waste of time from being spent.

In the first embodiment, the case where all the multi-camera video data 10 is synchronously reproduced based on the shooting time as it is has been described. However, as described in the related art and the second and third embodiments, the search means is used. 3, the first display means 21 and the second display means 22 are also provided when the second multi-camera video data 4 that satisfies the given condition is reproduced synchronously based on the shooting time. In this case, the presence or absence of the video data of each camera can be intuitively and easily grasped from the display of the time section of the video data during the video playback, so that no video is displayed on the screen. In this case, it can be determined whether or not there is no video data at all, and it is possible to prevent wasteful time by continuing to observe without knowing a section having no video data. Say the effect can be obtained.

[0041]

As described above, according to the first image display device of the present invention, the first display for synchronously reproducing multi-camera image data shot by a plurality of cameras and time-synchronized with each other based on the shooting time. Means, and a second display means for displaying a time section of video data shot by each camera, and the first display means and the second display means are configured to be linked to each other. As a result, the presence or absence of the video data of each camera can be intuitively and easily grasped from the display of the time section of the video data.As a result, if the video is not displayed on the screen, it can be determined whether or not there is no video data at all, By continuously observing a section where no data exists at all, it is possible to prevent wasteful time from being spent.

According to the second image display apparatus of the present invention, the image display apparatus further comprises first display means for synchronously reproducing multi-camera image data shot by a plurality of cameras and time-synchronized with each other based on the shooting time. Since the display means (1) skips a section in which no video data captured by any of the above cameras exists and performs synchronous playback, it is possible to prevent wasteful time by continuing to observe a section in which no video data is present. If no video is displayed on the screen, it can be determined that it is not because there is no video data.

According to the third image display device of the present invention, the image display apparatus further comprises a first display means for synchronously reproducing multi-camera image data shot by a plurality of cameras and time-synchronized with each other based on the shooting time. The first display means synchronously reproduces a section in which no video data captured by any of the above cameras exists and explicitly indicates that no video data exists. Therefore, when no video is displayed on the screen, no video data exists. It is possible to determine whether or not this is a problem, and it is possible to prevent unnecessary time from being spent by continuously observing without knowing a section where there is no video data.

Further, according to the fourth video display device of the present invention, the first video images captured by a plurality of cameras and time-synchronized with each other are obtained.
Search means for searching video data satisfying a given condition from among the multi-camera video data, and outputting the video data as second multi-camera video data.
Of the multi-camera video data is synchronously reproduced based on the photographing time. In addition to the effects of the first to third video display devices, the processing of the first to third video display devices is limited to limited video only. Is performed, and there is an effect that the processing for the video which is not the target becomes unnecessary.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a video display device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the video display device according to the first embodiment of the present invention.

FIG. 3 is a diagram for explaining the video display device according to the first embodiment of the present invention.

FIG. 4 is a diagram for explaining an image display device according to a second embodiment of the present invention.

FIG. 5 is a diagram for explaining a video display device according to a second embodiment of the present invention.

FIG. 6 is a diagram for explaining a conventional video display device.

FIG. 7 is a diagram for explaining a conventional video display device.

FIG. 8 is a diagram for explaining a conventional video display device.

FIG. 9 is a diagram for explaining a conventional video display device.

[Explanation of symbols]

1 element data, 1a event data, 1b object data, 2 first multi-camera image data, 2a
Video entity data, 2b attribute data, 3 search means, 4
Second multi-camera video data, 4a video entity data,
4b attribute data, 5 map data, 6 means of dialogue, 7
Display means, 7a video display means, 7b map display means,
Reference numeral 8 denotes a display device for displaying a screen, 10 multi-camera video data, 10a video entity data, 10b attribute data, 2
1 first display means, 22 second display means, 40 video display area, 41, 42 video window, 43 background, 50 shooting time display area, 51 bar indicating time during playback, 52 each video was captured Bar showing time section, 53 time axis, 54 camera name, 55 map, 70
First display means, 140 video window, 151,
152 scroll bar, 160 play button.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shunji Nozawa 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C053 HA01 JA16 LA01 LA04 LA06 5C054 EA05 EA07 FE14 FE17 FF03 GB01 HA01 HA16 HA18 HA26

Claims (4)

[Claims] 1. A first display means for synchronously reproducing multi-camera video data shot by a plurality of cameras and time-synchronized with each other based on a shooting time, and a first display means for displaying a time section of the video data shot by each camera. An image display device comprising: a first display unit and a second display unit, wherein the first display unit and the second display unit are interlocked. 2. A multi-camera video data taken by a plurality of cameras and time-synchronized with each other, comprising first display means for synchronously reproducing based on a photographing time, wherein the first display means is provided by any one of the cameras. A video display device for performing synchronous reproduction by skipping a section where no video data exists. 3. A multi-camera video data which is photographed by a plurality of cameras and time-synchronized with each other, is provided with a first display means for synchronously reproducing based on a photographing time, wherein the first display means is photographed by any of the above cameras. A video display device, characterized in that a section in which no video data is present is synchronously reproduced by explicitly indicating that no video data is present. 4. Searching video data satisfying a given condition from first multi-camera video data captured by a plurality of cameras and time-synchronized with each other, and outputting the video data as second multi-camera video data. 4. The video display device according to claim 1, further comprising a search unit, wherein the first display unit reproduces the second multi-camera video data synchronously based on a shooting time.