WO2023181559A1

WO2023181559A1 - Monitoring system

Info

Publication number: WO2023181559A1
Application number: PCT/JP2022/047595
Authority: WO
Inventors: 磨己永島
Original assignee: 株式会社日立国際電気
Priority date: 2022-03-24
Filing date: 2022-12-23
Publication date: 2023-09-28
Also published as: JPWO2023181559A1

Abstract

The present invention provides a monitoring system that can reduce processing load on a monitor and that can reduce transmission data volume. A monitor 14 has a divided display mode for simultaneously displaying videos of a plurality of cameras by dividing a screen; and an enlarged display mode for displaying a video of one of the cameras on the whole screen. A camera 13 provided to each vehicle has: a memory 25 for storing information about a clipping range which is set for each of the cameras; a displaying video generation unit 22 for generating a full-size video or a partial video clipped from the full-size video on the basis of the information about the clipping range; and a displaying video transmission unit 26 for transmitting the full-size video or the partial video generated by the displaying video generation unit 22. In the divided display mode, the monitor 14 requests transmission of partial videos from the cameras 13 which are targets for displaying, whereas, in the enlarged display mode, the monitor 14 requests transmission of a full-size video from one of the cameras 13 which is a target for displaying.

Description

Monitoring system

The present invention relates to a monitoring system that displays images from cameras installed in each car of a train on a monitor.

Ensuring safety when passengers board and alight trains at station platforms is an important issue for train operations. As part of such safety measures, a train monitoring system has been developed that uses a camera attached to the side of the train to take pictures of the area around the train door and displays the camera image on a monitor in the driver's cab.

The following are conventional technologies in the technical field related to the present invention. For example, Patent Document 1 discloses a system in which a display area of a monitor is divided into a plurality of areas, and a plurality of camera images taken by cameras of each vehicle are allocated to each area and displayed.

Japanese Patent Application Publication No. 2018-113602

Conventional train monitoring system monitors were configured to receive multiple camera images distributed from multiple cameras, cut out a predetermined range from each of the multiple camera images, and display them simultaneously by splitting the screen. . However, since the monitor performs cutting processing on images from a plurality of cameras, there is a problem in that the processing load on the monitor side is large. Furthermore, since multiple cameras were distributing camera images at the same time, there was a problem in that the amount of transmitted data increased.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object of the present invention is to provide a monitoring system that can reduce the processing load on a monitor and reduce the amount of transmitted data. .

In order to achieve the above object, a monitoring system according to one aspect of the present invention is configured as follows.
In other words, in a monitoring system that displays images from cameras installed in each car of a train on a monitor, the monitor has two display modes: a first display mode in which images from multiple cameras are displayed simultaneously by splitting the screen, and a first display mode in which images from a single camera are displayed simultaneously. The camera has a second display mode that displays the entire screen, and the camera has a memory that stores information on the cropping range set for each camera, and a full-size video or information on the cropping range from the full-size video. In the first display mode, the monitor requests distribution of partial videos to multiple cameras to be displayed, and in the second display mode, , is characterized by requesting distribution of full-size video to one camera to be displayed.

Here, in the monitoring system according to the present invention, in response to receiving an operation from the user to specify a camera and set a cropping range, the monitor generates information on the cropping range and transmits it to the designated camera, The camera may be configured to store in memory the crop range information received from the monitor.

Furthermore, in the surveillance system according to the present invention, the camera may be configured to further have a function of distributing video for recording, in addition to the function of distributing full-size video or partial video.

According to the present invention, it is possible to provide a monitoring system that can reduce the processing load on the monitor and reduce the amount of transmitted data.

1 is a diagram showing a schematic configuration example of a train monitoring system according to an embodiment of the present invention. It is a figure showing the example of a screen display concerning split display mode. FIG. 3 is a diagram showing an example of a screen display related to an enlarged display mode. FIG. 2 is a diagram illustrating an example configuration of a camera in the train monitoring system of FIG. 1. FIG. FIG. 7 is a diagram illustrating an example of a processing sequence related to setting a cutting range. FIG. 3 is a diagram illustrating an example of setting a cutting range. FIG. 3 is a diagram illustrating an example of a processing sequence related to displaying a camera image.

A train monitoring system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration example of a train monitoring system according to an embodiment of the present invention. FIG. 1 shows a six-car train in which six cars are connected: No. 1 car 10-1, No. 2 car 10-2, . . . , No. 5 car 10-5, and No. 6 car 10-6. Note that the train is not limited to a train running on a railway, and may be a train of other types such as a monorail or a streetcar.

A switching hub (HUB) 11 is arranged in each car 10 of the train, and an IP network is constructed by cascading these. Furthermore, each vehicle 10 is equipped with a camera 13 for capturing images of passengers getting on and off the train. In the figure, a camera 13 is installed on the side of the vehicle body so as to photograph the door 12 of each vehicle 10 from the outside. Note that the camera 13 may be installed inside the vehicle. In order to simplify the explanation, an example in which one camera 13 is installed per vehicle will be described below, but the number of cameras 13 per vehicle is arbitrary.

A monitor 14 that displays camera images taken by the camera 13 of each car 10 is installed in the first car 10-1 and the sixth car 10-6 at the head or tail of the train. Furthermore, a recording device 15 for recording camera images taken by the camera 13 of each vehicle 10 is installed in the No. 1 car 10-1. Note that the recording device 15 may also be installed in another vehicle (for example, car No. 6 10-6) for redundancy.

The monitor 14 has a split display mode in which camera images from a plurality of cameras 13 are displayed simultaneously by dividing the screen, and an enlarged display mode in which camera images from one camera 13 are displayed on the entire screen. FIG. 2 shows an example of a screen display related to the split display mode. Further, FIG. 3 shows an example of a screen display related to the enlarged display mode.

In this example, when the train arrives at the station, the monitor 14 automatically starts displaying the camera image, and when the train leaves the station, the monitor 14 automatically starts displaying the camera image. shall be terminated. Furthermore, the display of camera images on the monitor 14 is set to the split display mode (FIG. 2) as the default, and when one camera image is selected by the user (for example, the driver), the display of the camera image related to that camera image is displayed. It is assumed that the display mode is switched to the enlarged display mode (FIG. 3). Note that such display control is only an example, and display control may be performed according to other conditions.

In the conventional train monitoring system, in the split display mode, the monitor receives multiple camera images distributed from multiple cameras, cuts out a predetermined range from each of the multiple camera images, and displays the screen by splitting the screen. were configured to be displayed simultaneously. On the other hand, the train monitoring system of this example is configured so that each of the cameras 13, rather than the monitor 14, performs the process of cutting out a predetermined range from the camera image for the split display mode.

FIG. 4 shows an example of the configuration of the camera 13 in the train monitoring system of this example.
The camera 13 of this example includes an imaging section 21, a display video generation section 22, a memory 25, a display video transmission section 26, a setting information reception section 27, a recording video generation section 28, and a recording video generation section 28. The transmitting section 29 is also provided.

The imaging unit 21 images the subject (near the door in this example) and outputs the obtained video signal. The display video generation section 22 generates a display video based on the video signal output from the imaging section 21. The display video generation section 22 includes a full-size video generation section 23 that generates a full-size video for the enlarged display mode, and a partial video generation section that generates a partial video cut out from a predetermined range from the full-size video for the split display mode. 24. The full-size video is, for example, full HD (1920×1080 pixels) video data (H.264, JPEG, etc.). Information on the range to be cut out from the full-size video for the partial video is stored in advance in the memory 25 as clipping range setting data.

The display video transmitter 26 transmits the display video (full-size video or partial video) generated by the display video generator 22 to the monitor 14. When the setting information receiving unit 27 receives information on the range to be cut out from the full-size video from the monitor 14, the setting information receiving unit 27 stores the information in the memory 25 as cutting range setting data. The recording video generation unit 28 generates a recording video based on the video signal output from the imaging unit 21. The recording video is, for example, XVGA (1366×768 pixels) video data (H.264, JPEG, etc.). The video recording transmitting unit 29 transmits the video recording generated by the video recording generating unit 28 to the recording device 15 and stores it therein.

First, setting of the extraction range in the train monitoring system of this example will be explained using FIG. 5. FIG. 5 shows an example of a processing sequence related to setting a cutting range.
Assume that a user (for example, a driver) operates the monitor 14 to instruct a transition to the viewing angle adjustment mode (step S1). In response to this, the monitor 14 starts the viewing angle adjustment mode (step S2) and accepts the designation of the target camera 13. Thereafter, the monitor 14 requests the target camera 13 to distribute the full-size video (step S3). The camera 13 that has received the request from the monitor 14 starts distributing the full-size video (step S4).

The monitor 14 displays the full-size video received from the target camera 13, and accepts the user's designation of the cropping range (step S5). The cutting range is specified, for example, by adjusting the position and size of a rectangular frame that is displayed superimposed on the full-size video. FIG. 6 shows an example of setting the extraction range. The range indicated by a broken line (rectangular frame) in the figure is the cutting range specified by the user.

When the monitor 14 receives the designation of the cropping range from the user, it transmits information about the designated cropping range to the target camera 13 as a command message (for example, a CGI command, etc.) (step S6). The camera 13 that has received the information on the cutting range stores the information as cutting range setting data. After that, when the user operates the monitor 14 and instructs to end the angle of view adjustment mode (step S7), a request to stop video distribution is sent to the target camera 13 (step S8), and the angle of view adjustment mode ends. (Step S9).

Here, in the above explanation, after transitioning to the angle of view adjustment mode, the camera 13 that is the target of the cropping range setting is specified, but it is not possible to transition to the angle of view adjustment mode with the target camera 13 specified. You can. That is, for example, while the monitor 14 is displaying a plurality of camera images in the split display mode, one of them may be selected and a transition to the view angle adjustment mode may be instructed.

Note that in this example, each camera 13 stores information on the cropping range (cropping range setting data), but the monitor 14 may also store the same information. Thereby, when setting the cropping range on the monitor 14, it is possible to display a rectangular frame indicating the current cropping range in a superimposed manner on the camera image. Alternatively, when the monitor 14 transitions to the view angle adjustment mode, it requests information on the current cropping range from the target camera 13, and creates a rectangular frame indicating the current cropping range based on the returned cropping range information. It may also be displayed superimposed on the camera image. Furthermore, the cropping range set for a certain camera may be duplicated (copied) so that it can be applied to another camera.

Next, the display of camera images in the train monitoring system of this example will be explained using FIG. 7. FIG. 7 shows an example of a processing sequence related to displaying a camera image. Here, in the following explanation, the camera 13 of car n (n=1 to 6) will be expressed as "camera (n)".

When the train arrives at the station (step S11), the monitor 14 displays partial images (images cut out from the full-size image) for the cameras (1) to (6) of each vehicle in order to start displaying camera images. ) is requested (step S12). Note that whether or not the train has arrived at the station can be determined based on the positional information of the train obtained by, for example, GPS (Global Positioning System). Alternatively, it is also possible to determine whether the train has arrived at the station based on the speed information of the train (for example, it can be determined that the train has stopped if the speed is 5 km/h or less). Alternatively, a combination of these may be used to determine whether the train has arrived at the station.

In response to a request from the monitor 14, the cameras (1) to (6) cut out a partial video from the full-size video according to the clipping range setting data and distribute it to the monitor 14 (step S13). The monitor 14 starts displaying in the split display mode based on the plurality of partial videos distributed from the cameras (1) to (6) (step S14). As a result, a screen as shown in FIG. 2 is displayed on the monitor 14.

Next, assume that the user (for example, the driver) operates the monitor 14 to select a camera image to be displayed on the entire screen (step S15). Here, it is assumed that camera (2), which is the camera 13 of car No. 2 10-2, is selected. In this case, the monitor 14 requests the camera (2) to distribute the full-size video (step S16). When the camera (2) receives the full-size video distribution request, it stops distributing the partial video and starts distributing the full-size video instead (step S17). Note that cameras (1), (3) to (6) that have not received a full-size video distribution request continue to distribute partial video.

The monitor 14 switches from the split display mode to the enlarged display mode based on the full-size video distributed from the camera (2) (step S18). As a result, a screen as shown in FIG. 3 is displayed on the monitor 14. This allows the user to check the situation around the door of car No. 2 10-2 in more detail.

Next, assume that the user operates the monitor 14 and instructs to end the enlarged display (step S19). In response, the monitor 14 requests the camera (2) to distribute the partial video (step S20). When the camera (2) receives the partial video distribution request, it stops distributing the full-size video and starts distributing the partial video instead (step S21). The monitor 14 switches to display in the split display mode based on the plurality of partial videos distributed from the cameras (1) to (6) (step S22).

After that, when the train departs from the station (step S23), the monitor 14 requests the cameras (1) to (6) to stop video distribution. Note that whether or not the train has departed from the station can be determined based on, for example, the position information of the train obtained by GPS or the like. Alternatively, it is also possible to determine whether the train has departed from the station based on the speed information of the train (for example, it is determined that the train has departed when the speed is 5 km/h or more). Alternatively, a combination of these may be used to determine whether the train has departed from the station. Cameras (1) to (6) that have received the video distribution stop request stop video distribution. Further, in conjunction with this, the monitor 14 ends displaying the camera image (step S24).

Here, in the above explanation, the display of the camera image starts and ends automatically in conjunction with the stop and departure of the train, but the user can operate the monitor 14 to display the camera image. The display may be started and ended. Further, in the above description, in the enlarged display mode, other cameras that are not the target also continue to distribute partial videos, but other cameras may interrupt distribution of partial videos. In this case, when transitioning to the enlarged display mode, the monitor 14 requests the target camera to distribute full-size video, instructs the other cameras to stop video distribution, and switches to the split display mode. When returning to normal mode, it is sufficient to request all cameras to distribute partial images.

Although omitted in the sequence example of FIG. 7, cameras (1) to (6) send video for recording to the recording device 15 in addition to video for display on the monitor 14 (full-size video or partial video). It is continuously distributed to. Therefore, regardless of the display mode of the monitor 14, the recording device 15 records video for recording (full-size video) distributed from the cameras (1) to (6). The recording device 15 may perform recording only during the period when the camera video is displayed on the monitor 14, or may perform recording at all times while the train is in operation.

As described above, in the train monitoring system of this example, the monitor 14 has two modes: a split display mode (an example of the first display mode according to the present invention) in which images from a plurality of cameras are displayed simultaneously by splitting the screen; It has an enlarged display mode (an example of the second display mode according to the present invention) in which the video is displayed on the entire screen. In addition, the camera 13 of each vehicle has a memory 25 that stores information on the cropping range set for each camera (cropping range setting data), and a memory 25 that stores the cropping range information (cropping range setting data) set for each camera, and a memory 25 that stores the cropping range information (cropping range setting data) set for each camera. The display video generating unit 22 includes a display video generating unit 22 that generates a partial video generated by the display video generating unit 22, and a display video transmitting unit 26 that distributes the full-size video or partial video generated by the display video generating unit 22. In the split display mode, the monitor 14 requests a plurality of cameras 13 to be displayed to distribute partial images, and in the enlarged display mode, the monitor 14 requests a full-size image to be distributed to one camera 13 to be displayed. Request delivery of.

In this way, the camera 13 of each vehicle generates a full-size video or a partial video and distributes it to the monitor 14 in response to a request from the monitor 14, so there is no need for the monitor 14 to perform partial video generation processing. , the processing load on the monitor 14 is reduced. Furthermore, in the split display mode, a partial video with a lower capacity than a full-size video is distributed from the camera 13 of each vehicle to the monitor 14, so that the transmission data capacity is reduced.

Here, in the above explanation, there is a split display mode (that is, a 6-split display mode) in which one screen is divided into six parts and six partial images are displayed, but the screen may be divided into a larger number or fewer parts. , more or fewer partial images may be displayed. For example, in addition to the 6-split display mode, there is a 3-split display mode in which one screen is divided into 3 and three partial images are displayed, and the 6-split display mode is switched to the 3-split display mode according to the user's operation. It may also be possible to check the video in both units. In this case, the camera 13 of each vehicle stores the cropping range setting data for the 6-split display mode and the cropping range setting data for the 3-split display mode in its memory, and performs cropping according to the display mode of the monitor 14. Just switch the range.

Although the embodiments of the present invention have been described above, the above embodiments are merely illustrative and do not limit the technical scope of the present invention. The present invention can take various other embodiments, and various modifications such as omissions and substitutions can be made without departing from the gist of the present invention. These embodiments and their modifications are included within the scope and gist of the invention described in this specification, etc., and are also included within the scope of the invention described in the claims and its equivalents.

Furthermore, the present invention not only can be provided as devices such as those mentioned in the above description or a system configured with these devices, but also methods to be executed by these devices, and functions of these devices can be implemented by a processor. It is also possible to provide a program for realizing the program, a storage medium that stores such a program in a computer-readable manner, and the like.

The present invention can be used in a monitoring system that displays images from cameras installed in each car of a train on a monitor.

10-1 to 10-6: vehicle, 11: switching hub, 12: door, 13: camera, 14: monitor, 15: recording device, 21: imaging unit, 22: display video generation unit,
23: Full size video generation section, 24: Partial video generation section, 25: Memory, 26: Display video transmission section, 27: Setting information reception section, 28: Recording video generation section, 29: Recording video transmission section

Claims

In a monitoring system that displays images from cameras installed in each train car on a monitor,
The monitor has a first display mode in which images from a plurality of cameras are displayed simultaneously by dividing the screen, and a second display mode in which images from one camera are displayed on the entire screen,
The camera has a memory for storing information on a cropping range set for each camera, and a function for distributing a full-size video or a partial video extracted from the full-size video based on the information on the cropping range. has
In the first display mode, the monitor requests a plurality of cameras to be displayed to distribute the partial video, and in the second display mode, the monitor requests one camera to be displayed to distribute the partial video. A surveillance system characterized by requiring full-size video distribution.
The monitoring system according to claim 1,
The monitor generates information on the cropping range and transmits it to the designated camera in response to receiving an operation from a user to specify a camera and set a cropping range,
The monitoring system is characterized in that the camera stores information on the cutting range received from the monitor in the memory.
The monitoring system according to claim 1,
The surveillance system is characterized in that the camera further has a function of distributing video for recording, in addition to the function of distributing the full-size video or the partial video.