JP2010245578A - Video monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically switch camera videos to be displayed in a video monitoring system for displaying the videos of a plurality of cameras installed outside a moving object by a display device provided inside the moving object. <P>SOLUTION: Radio equipment M1 to M4 transmit video data of cameras K1 to K3 and channel information on its own radio equipment to a vehicle side by radio. On the vehicle side, mobile radio equipment receives the video data and channel information. A control unit determines the radio equipment, in which a radio communication connection state is established with the mobile radio equipment, on the basis of the channel information, determines a camera on the basis of the determination result of the radio equipment, and inputs, to a decoder, a signal of video switching control for displaying the video of the determined camera on a monitor 3. A decoder switches video data to be processed according to a signal of the video switching control, converts corresponding video data into analog video, and outputs the converted video data to a monitor 3 to display them. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a video monitoring system that displays video captured by a plurality of cameras installed outside a moving body using a display device provided inside the moving body, and in particular, a display provided inside the moving body. The present invention relates to a video surveillance system capable of automatically switching camera video displayed by an apparatus.

  For example, a video monitoring system that monitors the video of a camera on the ground side in a moving body such as a train or a bus is known. As a specific example, in a system applied to a train, a camera is installed at or near the platform of the station, and the camera image is wirelessly transmitted to the train side by a wireless device and displayed on a monitor on the train. The driver etc. inside can monitor the state of the outside.

JP 2003-104203 A JP-A-8-301115

Conventionally, in order to switch the camera image to be displayed on the on-board monitor when multiple cameras are installed on the ground side, a video display switching operation by an operator (driver, etc.) is a trigger. The operator always had to switch manually. In other words, the operator looks at the camera image displayed on the on-board monitor, monitors the state of the subject (for example, a train or passenger in a train system), determines the situation, and manually displays the camera image to be displayed. It was normal to switch at.
The present invention has been made in view of such conventional circumstances, and an object of the present invention is to provide a video monitoring system that can save an operator from manually switching video.

In order to achieve the above object, according to the present invention, a video monitoring system for displaying video captured by a plurality of cameras installed outside a moving body on a display device provided inside the moving body is as follows. Configured.
That is, a plurality of wireless devices installed outside the moving body form different wireless communication areas, and transmit images captured by the camera wirelessly. A mobile radio provided inside the mobile receives an image transmitted by radio from a radio established in a wireless communication connection state among the plurality of radios. Camera determining means provided in the mobile body determines a camera for displaying an image from among the plurality of cameras according to the wireless device that has established a wireless communication connection state with the mobile wireless device. Display image control means provided inside the moving body controls the display device to display an image captured by the camera determined by the camera determination means and transmitted wirelessly by the wireless device. .

  Therefore, since the camera that displays the video is determined and displayed from among a plurality of cameras according to the radio that has established a wireless communication connection state with the mobile radio, the operator manually This eliminates the hassle of switching images, so that, for example, when applied to a video surveillance system such as a train, drivers can concentrate on the original work (operation) and intervene in human hands. It is possible to prevent the possibility of occurrence of errors or delays in the switching operation due to.

Here, various moving objects may be used as the moving body, for example, a train or a bus may be used.
Various numbers may be used as the number of cameras.
In addition, various places may be used as places where a plurality of cameras are installed. As an example, a train (an example of a moving body) is monitored in the train at the station platform (or in the vicinity thereof). A place where images of a plurality of positions that need to be taken can be taken can be used.
Further, for example, in order to identify each camera, identification information including a unique number for each camera is used.

Various numbers may be used as the number of wireless devices.
Moreover, various places may be used as a place where a plurality of radios are installed. As an example, for a train (an example of a moving body), an equal interval or arbitrary along a track on which the train moves Space intervals can be used.
Since each wireless device forms a different wireless communication area, the mobile device exists by identifying a wireless device that has established a wireless communication connection state with the mobile wireless device provided inside the mobile device. It is possible to identify the position on the track (for example, it may be an approximate position to a practically effective level).
In addition, as long as it is effective in practical use, for example, a configuration having overlapping areas may be used as the wireless communication area of each wireless device.
Further, for example, in order to identify each wireless device, identification information including a number unique to each wireless device is used.

In addition, various methods may be used as a method of determining a camera according to a wireless device that has established a wireless communication connection state with a mobile wireless device. For example, the correspondence relationship between the wireless device and the camera may be determined in advance. It is possible to use a method that is set and stored in a memory and determined by referring to the stored contents.
Further, for example, a configuration in which one camera corresponds to one wireless device is used, but as another configuration example, a plurality of cameras correspond to one wireless device, and the plurality For example, a configuration in which videos captured by a single camera are simultaneously displayed may be used.

  Various methods may be used as a method for controlling the display device to display an image captured by the determined camera and transmitted wirelessly by the wireless device. For example, the determined camera Is received by the mobile radio (depending on the situation, images taken by other cameras), the video included in the received signal is selected (for example, selected). And a method of controlling to display the image on the display device, or when the image captured by the determined camera is not received by the mobile radio, the video is mobile radio. A method is used in which control is performed so that the video is received (that is, the video is acquired), and the video is displayed on the display device. Door can be.

  As described above, according to the video surveillance system of the present invention, a camera that displays video is determined from among a plurality of cameras according to a radio that has established a wireless communication connection state with a mobile radio. Since the video is displayed, the operator can save time and effort to manually switch the video, and the efficiency of the system can be improved.

It is a figure which shows the outline | summary of the video surveillance system which concerns on one Embodiment of this invention. It is a figure which shows the structural example of the video surveillance system which concerns on one Embodiment of this invention.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 illustrates an overview of a train video monitoring system according to an embodiment of the present invention.
The video monitoring system of this example is for monitoring video around a train, for example, using a closed network, and video captured by a plurality of cameras K1, K2, and K3 installed in a platform 1 of the station. Is transmitted wirelessly using a plurality of wireless devices M1, M2, M3, and M4 installed along the track 2, and received by a mobile wireless device provided inside a train traveling on the track 2. Displayed on the monitor 3 provided in the train. FIG. 1 illustrates a plurality of different train positions T1, T2, and T3.

The cameras K1, K2, and K3 are for monitoring images required on the vehicle side, and are installed at major locations of the station. In this example, a camera K1 is installed at the point A of the home 1 when the train is stopped (stopped) at the home 1 (when it is at the point T1). A camera K2 is installed at the point B of the home 1 to check whether there is a person being caught between the home 1 and the train when the train starts moving. A camera K3 for checking the situation past the home (near the point T2) is installed.
In this example, the identification information (for example, camera number) set to each camera K1, K2, K3 is added to the video output from each camera K1, K2, K3. In this example, this camera identification information is preset and stored in the memory on the train side.
In addition, the position and the number of cameras are not limited to this example. For example, another camera or the like for confirming the situation where the train further travels (near T3 point) may be installed. Good.

  In this example, as the cameras K1, K2, and K3, IP cameras that support digitization that transmit video using IP (Internet Protocol) are used, and digital video can be output without providing an encoder separately. However, as another configuration example, an analog camera (for example, an existing analog camera) may be used. In this case, for example, an analog video output from the analog camera is input to a WEB encoder and encoded into a digital video. Good.

  The wireless devices M1, M2, M3, and M4 are wireless transmission devices for wirelessly transmitting video data (digital video) captured by the cameras K1, K2, and K3 to the vehicle side (monitor side). In this example, the radio units M1, M2, M3, and M4 are installed at equal intervals in order along the track 2 (along the course of the train), and are formed by the directional antennas provided for each. The wireless communication areas R1, R2, R3, and R4 that are performed are continuous different areas.

  That is, as the train moves, the radios that actually perform radio communication with the mobile radio set provided in the train change in the order of M1, M2, M3, and M4. Also, different channel information (channel number in this example) is assigned as identification information to each of the wireless devices M1, M2, M3, and M4, and is transmitted by radio separately from (or accompanying with) video data. Is done. In this example, channel information between radios different from normal video signals is used as channel information, # 1 for radio M1, # 2 for radio M2, and for radio M3. # 3 is assigned to the wireless device M4.

This channel information is received by a mobile radio provided in the train. And on the train side, by identifying the channel information of the radio that is performing radio communication with the mobile radio, the radio communication connection status is established with which radio. Based on this determination, a camera that captures an image to be displayed on the monitor 3 in the train is determined, and the display image on the monitor 3 is automatically switched.
Note that the position and the number of the wireless devices are not limited to this example. Further, the interval between the wireless devices may be an arbitrary interval. Further, an omnidirectional antenna may be used instead of the directional antenna.

FIG. 2 shows a configuration example of a video monitoring system according to this example.
In the video monitoring system of this example, a plurality of cameras (cameras K1, K2, and K3 in this example) and a plurality of wireless devices (in this example, wireless devices M1, M1) installed outside the train (in this example, the ground side). M2, M3, M4) are connected via a HUB 6 by wire or wirelessly.
The HUB 6 is a network switch for communicating digital data (in this example, IP video data) from the cameras K1, K2, and K3, and has a switching function for flowing data to a necessary place.

A monitor 3, a control unit 4, a decoder 5, and a mobile radio device N are provided inside the train (train side).
The mobile radio N performs radio communication with radios M1, M2, M3, and M4 installed outside the train, and is transmitted by radio from a radio that has established a radio communication connection state. Receiving video data (digital video) and channel information.
The control unit 4 obtains channel information of the radio set with the wireless communication connection state established with the mobile radio set N from the mobile radio set N, and outputs video to the decoder 5 based on the channel information. Perform switching control. In this example, the correspondence between the wireless devices M1, M2, M3, and M4 that are connected for communication and the cameras K1, K2, and K3 that display images is preset and stored in the memory of the control unit 4. The unit 4 refers to the stored content to determine the camera that captures the video to be displayed on the monitor 3 and performs video switching control.

The decoder 5 is a device that converts the video data (digital video) of the cameras K1, K2, and K3 input from the mobile wireless device N into an analog video and outputs the analog video. It has a function of switching video data. In this example, a video switching control signal input from the control unit 4 is used as an external control signal. For example, an operation unit operated by a person (driver or the like) is provided inside the train. Thus, a video switching instruction signal manually input by a person may be used as a control signal.
The monitor 3 is a display device that displays the analog video that is converted and output by the decoder 5.

Next, an example of operation by the video monitoring system of this example will be described.
Video data (digital video) captured by the cameras K1, K2, and K3 is input to the wireless devices M1, M2, M3, and M4 via the HUB 6, and is transmitted to the vehicle side (monitor) by the wireless devices M1, M2, M3, and M4. Side). In addition, channel information (information indicating which wireless device is communicating) is wirelessly transmitted from the wireless devices M1, M2, M3, and M4.

  On the vehicle side, the mobile wireless device N receives video data and channel information wirelessly transmitted from the wireless devices M1, M2, M3, and M4. The control unit 4 acquires the channel information received by the mobile radio device N, discriminates the radio device in which the wireless communication connection state is established with the mobile radio device N, and based on the discrimination result A camera that captures an image to be displayed on the monitor 3 is determined, and a video switching control signal for causing the monitor 3 to display the image captured by the determined camera is input to the decoder 5. The decoder 5 performs switching (camera switching) of video data to be processed (communication target) in accordance with a video switching control signal input from the control unit 4, converts the corresponding video data into an analog video, and outputs it to the monitor 3. Output.

  In this example, in accordance with the change in the order of M1, M2, M3, and M4, the radios that perform radio communication with the mobile radio N in accordance with the movement of the train in the traveling direction, the monitor in the train 3 is automatically switched. That is, the position of the train is identified by determining the wireless device that performs wireless communication with the mobile wireless device N, and automatic control is performed so that an appropriate camera image corresponding to the position is displayed on the monitor 3 is doing.

  Here, the timing of switching the camera video can be arbitrary, for example, a new wireless communication connection state has been established between the mobile wireless device N and any of the wireless devices M1, M2, M3, and M4. The camera image may be switched in accordance with (that is, at the timing when the wireless device is switched). As another configuration example, the state of wireless communication with one or more wireless devices having established wireless communication connection states (for example, The position of the train may be specified according to the reception level from each wireless device), and the camera video may be switched at a timing when it is determined that the train has reached a preset position.

  In this example, the video of one or more cameras designated by the decoder 5 by external control from the video data of the cameras K1, K2, and K3 received through any of the wireless devices M1, M2, M3, and M4. Data is selected as a processing target and converted into analog video. For example, the decoder 5 is selectively connected to a specific camera so that only the video data of one or more cameras designated by external control is acquired. You may employ | adopt the structure which communicates.

  As described above, in the video surveillance system according to this example, in the surveillance camera system using a radio, the video displayed on the monitor 3 provided on the moving body (train in this example) is linked to the switching of the radio. Automatically switching to the appropriate camera image. According to the video monitoring system according to this example, by switching the camera video based on the communication information (channel information) received from the wireless device, switching of the camera video that the operator had to perform as in the past The operation can be omitted, and the necessary video is automatically displayed on the monitor 3. As described above, the video monitoring system of this example has a function of automatically controlling the switching of the camera video in accordance with the wireless communication area (communication area) of the wireless device. Thus, the operator can operate efficiently.

  When the video monitoring system of this example is applied to a moving body such as a train or a bus, when the ground side camera video is monitored in the moving body, any of the ground side wireless transmission devices installed on the moving body side Receives channel information indicating whether communication with the (radio device) is established, sees the timing when the reception area switches based on this information, and displays the video of the monitoring camera displayed on the monitor in the moving body at the timing when the reception area switches Can be switched.

  Note that in the video monitoring system of this example, the camera determination means is configured by the function in which the control unit 4 determines the camera that displays the video according to the wireless device that has established a wireless communication state with the mobile wireless device N. The control unit 4 controls the decoder 5 so that the determined video of the camera is displayed on the display device (in this example, the monitor 3).

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the configuration described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
The various processes performed in the system and apparatus according to the present invention are not limited to the software configuration as described above. For example, each functional unit may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM (Read Only Memory) storing the program, or the program (itself). The program according to the present invention can be performed by inputting the program from the recording medium to a computer and executing the program.

  K1, K2, K3: Camera, M1, M2, M3: Radio, N: Mobile radio, T1, T2, T3: Train position, R1, R2, R3, R4: Wireless communication area, 1: Home, 2: Track, 3: Monitor, 4: Control unit, 5: Decoder, 6: HUB

Claims (1)

In a video monitoring system for displaying video captured by a plurality of cameras installed outside a moving body on a display device provided inside the moving body,
A plurality of wireless devices installed outside the mobile body, each forming a different wireless communication area, and wirelessly transmitting video captured by the camera;
A mobile radio that is provided inside the mobile and receives a video transmitted by radio from a radio that has established a wireless communication connection state among the plurality of radios; and
Camera determination means for determining a camera that displays an image among the plurality of cameras according to a wireless device that is provided inside the mobile body and has established a wireless communication connection state with the mobile wireless device;
Display video control means provided inside the moving body for controlling an image captured by the camera determined by the camera determination means and transmitted wirelessly by the wireless device to be displayed on the display device;
A video surveillance system comprising:

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