JP7195781B2 - surveillance camera system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a surveillance camera system, and more particularly to a surveillance camera system that can monitor and record images without delay even when a malfunction occurs in some of the devices.

[Description of prior art]
Generally, in a conventional surveillance camera system, images captured by a surveillance camera are coded for easy long-distance transmission, and are monitored using LAN (Local Area Network) lines or optical lines. Delivered to another location for recording.
At that time, using an information aggregation device equipped with a wired network switching function, the user can control the surveillance camera from the operation terminal, monitor the surveillance camera image, and save the captured image to the information storage device. It can be recorded and played back.

Therefore, when constructing a surveillance camera system, an information aggregation device is often required. Since this device connects the surveillance cameras and each operation terminal, if an abnormality occurs in the information aggregation device, the entire system will be affected. An error may occur and the system may stop working.

Also, in a surveillance camera system, each device that makes up the system often plays a special role. Such problems are expected to occur frequently.

[Related technology]
Incidentally, as a conventional technology related to a monitoring device for monitoring a network, there is Japanese Unexamined Patent Publication No. 2000-90025 "Network monitoring device" (Patent Document 1), and as a conventional technology related to a surveillance camera system, Japanese Patent Laid-Open Publication No. 2015-204546 There is a "surveillance camera system" (Patent Document 2).

Japanese Patent Laid-Open No. 2002-200001 describes a network monitoring device that prevents the normal flow of information transmission from being interrupted when a failure is detected in a network or during normal operation.
In addition, in Patent Document 2, a management server that transmits images from a plurality of surveillance cameras to a monitoring terminal transmits surveillance images captured by a surveillance camera designated by a user to the surveillance terminal, and position information of the surveillance cameras is A surveillance camera system that is not displayed on a surveillance terminal is described.

JP-A-2000-90025 JP 2015-204546 A

However, the conventional surveillance camera system has a problem that it may not be possible to monitor and record images normally when a problem occurs in the information aggregation device or other equipment.

It should be noted that Patent Documents 1 and 2 describe that a video transmission device that transmits video information from a camera and a video reception device that receives the video information cyclically confirm survival and specify a fault occurrence point. It has not been.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a surveillance camera system that can monitor and record images without delay even if some devices malfunction.

The present invention is a surveillance camera system for solving the above-mentioned problems of the prior art, comprising: a plurality of surveillance cameras for photographing objects to be monitored; A plurality of video transmission devices for transmission, a plurality of video reception devices for receiving video data transmitted from the plurality of video transmission devices, and an information storage device for storing video data connected to one of the plurality of video reception devices. , a plurality of terminal devices each connected to a plurality of video receiving devices to which the information storage device is not connected, and the video data transmitted from the plurality of video transmitting devices are distributed to the plurality of video receiving devices connected to the terminal devices. and an information aggregation device, wherein a video receiving device connected to a terminal device transfers received video data to a video receiving device connected to an information storage device, and the video receiving device connected to the information storage device It receives transferred video data and outputs it to an information storage device, and a plurality of video transmission devices form a ring communication network in which forward or reverse communication is performed wirelessly, and is a transmission side management device. Starting from a specific video transmission device, existence confirmation is performed in the forward direction, and when a failure is detected, survival confirmation is also performed in the reverse direction, and the specific video transmission device is transmitted in two directions: the forward direction and the reverse direction. It is characterized by collating the content of the failure occurrence detected in the direction to specify the location of the failure.

Further, the present invention is a surveillance camera system, comprising: a plurality of surveillance cameras for photographing objects to be monitored; and a plurality of video transmission devices connected to the plurality of surveillance cameras and transmitting video data shot by the surveillance cameras. , a plurality of video receiving devices that receive video data transmitted from a plurality of video transmitting devices, an information storage device that is connected to one of the plurality of video receiving devices and stores video data, and an information storage device that are connected. a plurality of terminal devices each connected to a plurality of video receiving devices that are not connected to each other; The video receiving device connected to the terminal device transfers the received video data to the video receiving device connected to the information storage device, and the video receiving device connected to the information storage device receives the transferred video data. and output to the information storage device, and a plurality of video receiving devices form a ring communication network in which wireless communication is performed in the forward or reverse direction. , the survival is confirmed in the forward direction, and if a failure is detected, the survival is also confirmed in the reverse direction, and the content of the failure detected in the two directions, the forward direction and the reverse direction, by a specific video receiving device. is collated to identify the failure location.

Further, the present invention is a surveillance camera system, comprising: a plurality of surveillance cameras for photographing objects to be monitored; and a plurality of video transmission devices connected to the plurality of surveillance cameras and transmitting video data shot by the surveillance cameras. , a plurality of video receiving devices that receive video data transmitted from a plurality of video transmitting devices, an information storage device that is connected to one of the plurality of video receiving devices and stores video data, and an information storage device that are connected. a plurality of terminal devices each connected to a plurality of video receiving devices that are not connected to each other; The video receiving device connected to the terminal device transfers the received video data to the video receiving device connected to the information storage device, and the video receiving device connected to the information storage device receives the transferred video data. is output to the information storage device, and if a failure occurs in the video reception device connected to the information storage device, the terminal device temporarily stores the video data received by the connected video reception device.

Further, in the monitoring camera system of the present invention, when the video transmitting device detects that transmission to the video receiving device or the information aggregation device is impossible, video data captured by the connected monitoring camera is temporarily Characterized by memorization.

Further, in the surveillance camera system of the present invention, when the video transmission device or the video reception device detects that communication with the information aggregation device is disabled, the video transmission device and the video reception device switch to wireless communication. It is characterized by transmitting and receiving video data by wireless communication.

According to the present invention, a surveillance camera system includes a plurality of surveillance cameras for photographing objects to be monitored, and a plurality of video transmission devices connected to the plurality of surveillance cameras and transmitting video data shot by the surveillance cameras. , a plurality of video receiving devices that receive video data transmitted from a plurality of video transmitting devices, an information storage device that is connected to one of the plurality of video receiving devices and stores video data, and an information storage device that are connected. a plurality of terminal devices each connected to a plurality of video receiving devices that are not connected to each other; The video receiving device connected to the terminal device transfers the received video data to the video receiving device connected to the information storage device, and the video receiving device connected to the information storage device receives the transferred video data. and output to an information storage device, and a plurality of video transmission devices form a ring communication network in which wireless communication is performed in the forward or reverse direction. , confirming existence in the forward direction, and if a failure occurrence is detected, also confirming existence in the reverse direction, and the content of the failure occurrence detected by the specific video transmission device in both the forward direction and the reverse direction. is collated to specify the location of failure, there is an effect that the location of failure in a plurality of video transmission devices can be identified reliably and accurately.

Further, according to the present invention, there is provided a surveillance camera system comprising: a plurality of surveillance cameras for photographing objects to be monitored; a device, a plurality of video receiving devices that receive video data transmitted from a plurality of video transmitting devices, an information storage device that is connected to one of the plurality of video receiving devices and stores video data, and an information storage device. A plurality of terminal devices that are respectively connected to a plurality of unconnected video receiving devices, and an information aggregation device that distributes video data transmitted from the plurality of video transmitting devices to the plurality of video receiving devices connected to the terminal devices . The video receiving device connected to the terminal device transfers the received video data to the video receiving device connected to the information storage device, and the video receiving device connected to the information storage device receives the transferred video data. It receives and outputs to an information storage device, and a plurality of video receiving devices form a ring communication network in which forward or reverse communication is performed wirelessly. As a starting point, existence confirmation is performed in the forward direction, and if a failure occurrence is detected, survival confirmation is also performed in the reverse direction, and a specific video receiving device detects a failure occurrence in both the forward direction and the reverse direction. Since the surveillance camera system identifies the location of failure by collating the content of the above, there is an effect that the location of failure in a plurality of video receivers can be identified reliably and accurately.

Further, according to the present invention, there is provided a surveillance camera system comprising: a plurality of surveillance cameras for photographing objects to be monitored; a device, a plurality of video receiving devices that receive video data transmitted from a plurality of video transmitting devices, an information storage device that is connected to one of the plurality of video receiving devices and stores video data, and an information storage device. A plurality of terminal devices that are respectively connected to a plurality of unconnected video receiving devices, and an information aggregation device that distributes video data transmitted from the plurality of video transmitting devices to the plurality of video receiving devices connected to the terminal devices . The video receiving device connected to the terminal device transfers the received video data to the video receiving device connected to the information storage device, and the video receiving device connected to the information storage device receives the transferred video data. The video data is received and output to the information storage device, and if a failure occurs in the video reception device connected to the information storage device, the terminal device temporarily stores the video data received by the connected video reception device. Therefore, even if the image data cannot be transferred to the information storage device, the image data can be reliably stored.

Further, according to the present invention, when the video transmission device detects that transmission to the video reception device or the information aggregating device is impossible, the video data captured by the connected monitoring camera is temporarily stored. Since it is a camera system, there is an effect that the video data can be reliably saved even in a state where communication from the video transmission side to the video reception side is not possible.

Further, according to the present invention, when the video transmission device or the video reception device detects that communication with the information aggregation device is disabled, the video transmission device and the video reception device switch to wireless communication to transmit and receive video data. is wirelessly communicated, video data can be transmitted to the video receiver via wireless communication even when wired communication is not possible, and monitoring can be carried out smoothly.

1 is a configuration block diagram of a monitoring camera system according to an embodiment of the present invention; FIG. 2 is a configuration block diagram showing a schematic configuration of a video transmission device 13; FIG. 2 is a configuration block diagram showing a schematic configuration of a video reception device 15; FIG. 2 is a configuration block diagram showing a schematic configuration of a terminal device 16; FIG. 4 is a flowchart showing processing of a transmission-side management device; FIG. 4 is an explanatory diagram of a video transmission device management table; FIG. 4 is an explanatory diagram of a video receiver management table; FIG. 4 is an explanatory diagram of a video transmission device monitoring table; 4 is a flow chart showing processing of a receiving side management device when a failure occurs in an information storage device; FIG. 10 is an explanatory diagram showing contents of a video reception device management table when a failure occurs in the information storage device and the video reception device (2); FIG. 11 is an explanatory diagram of a video reception device management table after updating;

An embodiment of the present invention will be described with reference to the drawings.
[Outline of Embodiment]
A surveillance camera system according to an embodiment of the present invention includes: a plurality of video transmission devices for transmitting video captured by a camera; a plurality of video reception devices for receiving the video; a terminal device connected to the video reception device; and an information storage device for storing video received by the video receiving device. Starting from a specific video transmission device, existence confirmation is performed in the forward direction, and when a failure is detected, survival confirmation is also performed in the reverse direction, and the specific video transmission device performs two transmissions in the forward direction and the reverse direction. The content of the failure detected in the direction is collated to specify the location of the failure. It is possible to confirm the occurrence of a failure in the video transmission device, and to reliably detect the failure of the video transmission device.

Further, in the monitoring camera system according to the embodiment of the present invention, when a failure occurs in one of the video receiving devices in addition to the information storage device, the specific video receiving device (main video receiving device) The connection destination stored in the video transmission device management table corresponding to the video transmission device connected to the video reception device where the failure occurred is determined based on the preset priority connection destination information. The main video transmitting device is instructed to rewrite the video from the receiving device to another video receiving device, and the video information is reliably stored even if the information storage device and some video receiving devices fail. It is something that can be done.

In addition, in the monitoring camera system according to the embodiment of the present invention, when the video transmission device cannot connect to the information aggregation device by wire or connect to the video reception device by radio, the video data is transmitted from the monitoring camera. The received video information is stored in an internal storage unit, and even when wired or wireless communication is disabled, the video information can be reliably saved.

[Schematic configuration of surveillance camera system according to embodiment: FIG. 1]
FIG. 1 is a configuration block diagram of a monitoring camera system according to an embodiment of the present invention.
A surveillance camera system according to the present embodiment (this surveillance camera system) transmits video information (video data) from a surveillance camera installed in a surveillance target area by wire or wirelessly so that a supervisor or administrator can The information is displayed on the terminal device to be operated, stored in the information storage device and saved, and can be browsed at any time upon request from the terminal device.
In this surveillance camera system, even if a failure occurs in a device within the system, the video information can be reliably stored without concentrating the load on a specific device.

As shown in FIG. 1, the monitoring camera system includes a plurality of cameras (1) 11-1 to (n) 11-n (also referred to as camera 11) as a configuration of a monitoring target area. Relay device (1) 12-1 to relay device (n) 12-n (also referred to as relay device 12) connected to camera 11, and video transmission device (1) 13-1 to video transmission device (n). ) 13-n (sometimes referred to as a video transmission device 13), and as a configuration on the operator side, a video reception device (1) 15-1 to a video reception device (m) 15-m (video reception device 15), a terminal device (1) 16-1 to terminal device 16-m-1 (sometimes referred to as terminal device 16), and an information storage device 17; 13 and the video receiving device 15 are connected by wire.
Corresponding cameras 11, relay devices 12, and video transmission devices 13 are connected by wires, and corresponding video reception devices 15 and terminal devices 16 or information storage devices 17 are connected by wires.

Each component will be described.
Camera 11 constantly captures an image of a specific monitoring location and outputs a video signal to relay device 12 .
The relay device 12 converts the video signal from the connected camera 11 for transmission and transmits the video information to the video transmission device 13 .

The video transmission device 13 transmits the video information received from the relay device 12 to the corresponding video reception device 15. When the information aggregation device 14 is operating normally, the information aggregation device 14 is wired. When the information aggregating device 14 is faulty, it is transmitted wirelessly to the video receiving device 15 .
As will be described later, each video transmission device 13 is set with a video reception device 15 (corresponding video reception device) to which video information is to be transmitted. Particularly, in this monitoring camera system, when a failure occurs in a device in the system, the corresponding video receiving device can be changed.

Also, one of the plurality of video transmission devices 13 manages the entirety of the plurality of video transmission devices 13, and is called a transmission side management device. FIG. 1 shows the case where the video transmission device (1) 13-1 is the transmission side management device. The transmission side management device is set from, for example, the terminal device 16 operated by the manager. The transmission side management device corresponds to the main video transmission device in claim 1 .
The configuration of the video transmission device 13 will be described later.

The information aggregation device 14 has a switching function that connects the video transmission device 13 and the video reception device 15, and distributes the video information from the plurality of video transmission devices 13 to the plurality of video reception devices 15 for distribution.

The video receiving device 15 is connected to the terminal device 16 or the information storage device 17 .
Video receiving device (1) 15-1 (sometimes referred to as video receiving device (1)) to video receiving device (m-1) 15-m-1 (video receiving device (m- 1) receives video information from the connected video transmission device 13 and outputs it to the corresponding terminal device 16, and during normal operation, the information storage device 17 stores the video information. Transfer to the connected video receiving device (m) 15-m (sometimes referred to as video receiving device (m)).

It should be noted that the image receiving device (1) 15-1 to the image receiving device (m-1) 15-m-1 are preset from which image transmitting device 13 the image information is to be received. When the number of video receiving devices 15 is smaller than the number of video transmitting devices 13, one video receiving device 15 is set to receive video information from a plurality of video transmitting devices 13. FIG.

The video receiving device (m) 15-m is a communication device connected to the information storage device 17. During normal operation, each video receiving device (1) 15-1 to video receiving device (m-1) 15-m- 1 and outputs the video signal to the information storage device 17 .
In addition, the video receiving device (m) 15-m outputs from the information storage device 17 based on requests from the video receiving devices (1) 15-1 to (m-1) 15-m-1. The received image information is sent to the request source.

Furthermore, one of the plurality of video receivers 15 connected to the terminal device 16 manages the entirety of the video receivers 15, and is called a receiver side management device. FIG. 1 shows the case where the video receiving device (1) 15-1 is the receiving side management device. The receiving side management device is set by an instruction from the terminal device 16, and for example, the video receiving device 15 connected to the mainly operated terminal device 16 is selected.
Furthermore, when a failure occurs, the management device on the receiving side controls communication of the entire system including the video transmission device 13, and, for example, instructs switching from wired communication to wireless communication.
The receiving side management device corresponds to the main video receiving device in claim 2 . The configuration of the video receiving device 15 will be described later.

The terminal device 16 is a terminal operated by a supervisor or administrator, and displays images transmitted from the camera 11 and images stored in the information storage device 17, and performs settings and management for each device. The configuration of the terminal device 16 will be described later.
The information storage device 17 stores the input image information in association with the identification number of the camera and the date and time. output to

[Schematic operation of this surveillance camera system: Fig. 1]
Next, a schematic operation of this monitoring camera system during normal operation will be described with reference to FIG.
In this surveillance camera system, an image captured by the camera 11 is sent to the image transmission device 13 via the relay device 12 . When the information aggregation device 14 is operating normally, the video information is transmitted from the video transmission device 13 via the information aggregation device 14 to the corresponding video reception device 15 by wire.

The video information received by the video receiving device (1) to the video receiving device (m-1) is output and displayed on the connected terminal device 16, and transferred to the video receiving device (m). It is stored in the information storage device 17 .
Also, when a request for video viewing is input from the terminal device 16 to the information storage device 17, the video information corresponding to the request is read out from the information storage device 17, and the video receiving device (m) receives the request from the terminal of the request source. It is transmitted to the requesting terminal device 16 via the video receiving device 15 connected to the device 16 .
In this manner, the surveillance camera system operates normally.

[When an information aggregation device fails: Fig. 1]
The video receiving device 15 periodically performs wired communication with the information aggregation device 14 to check whether wired communication with the information aggregation device 14 is possible.
Then, when the video receiving device (1) 15-1, which is the management device on the receiving side, detects that wired communication is impossible, it transmits video to each video transmitting device 13 and each video receiving device 15 using a wireless signal. It outputs an instruction to switch transmission of information from wired communication to wireless communication. Instructions to the video transmission device 13 are issued via the transmission-side management device.
The video transmission device 13 and other video reception devices 15 transmit and receive video information wirelessly upon receiving an instruction to switch to wireless communication from the reception-side management device.
In this example, the management device on the reception side instructs switching from wired communication to wireless communication, but the management device on the transmission side may instruct to switch from wired communication to wireless communication.

[Configuration of video transmission device 13: FIG. 2]
Next, a schematic configuration of the video transmission device 13 will be described with reference to FIG. FIG. 2 is a configuration block diagram showing a schematic configuration of the video transmission device 13. As shown in FIG.
As shown in FIG. 2 , the video transmission device 13 includes a control section 131 , a wired communication section 132 , a wireless communication section 133 , a database section 134 and an information storage section 135 .
The control unit 131 controls the transmission of video information to the video receiving device 15, and controls the survival confirmation operation for mutually confirming the operating state with another video transmitting device 13, as will be described later. The life confirmation operation will be described later.

The wired communication unit 132 is wired to the relay device 12 and the information aggregation device 14 and performs wired communication with them.
The wireless communication unit 133 has a wireless antenna and performs wireless communication.
The database unit 134 stores a video transmission device management table that manages the status of all the video transmission devices 13 in the system and connection destination information. The video transmission device management table will be described later.
The information storage unit 135 accumulates video information when communication with the information aggregation device 14 or the video reception device 15 is not possible. The video information accumulated in the information storage unit 135 is read out after communication is restored and transmitted to the information aggregation device 14 or the video reception device 15 .

[Configuration of video receiving device 15: FIG. 3]
Next, a schematic configuration of the video receiving device 15 will be described with reference to FIG. FIG. 3 is a configuration block diagram showing a schematic configuration of the video receiving device 15. As shown in FIG.
As shown in FIG. 3 , the video receiving device 15 includes a control section 151 , a wired communication section 152 , a wireless communication section 153 and a database section 154 .
The control unit 151 performs transfer control of video information received from the video transmission device 13 and confirms existence of the video reception devices 15 mutually. Furthermore, the control unit 151 of the receiving-side management device performs control for reliably saving the video information when a problem occurs in the information storage device 17 or another video receiving device 15 .

The wired communication unit 152 is connected to the information aggregation device 14 and the terminal device 16 by wire, and performs wired communication with them.
The wireless communication unit 153 performs wireless communication.
The database unit 154 stores a video receiver management table and a video transmitter monitoring table.
The video receiver management table is a table for managing the status of all the video receivers 15 in the system and connection destination information. is a table that stores the These tables are described later.

[Configuration of terminal device 16: FIG. 4]
Next, a schematic configuration of the terminal device 16 will be described with reference to FIG. FIG. 4 is a configuration block diagram showing a schematic configuration of the terminal device 16. As shown in FIG.
As shown in FIG. 4 , the terminal device 16 includes a control section 161 , a wired communication section 162 , a database section 163 and an information storage section 164 . Furthermore, although illustration is omitted, an operation unit and a display unit are connected via an interface unit connected to the control unit 161 .

The control unit 161 controls display and storage of video information based on instructions from the operation unit and instructions from the connected video receiving device 15 .
The wired communication unit 162 performs wired communication with the video receiving device 15 .
The database unit 163 stores survival information and connection information equivalent to those of the video reception device 15 .
The information storage unit 164 stores the video information when the information storage device 17 (or the video receiving device (m) 15-m connected thereto) fails and the video information cannot be stored in the information storage device 17. save.

[Operation of Life Confirmation in Video Transmission Device 13: FIG. 1]
Next, the operation of confirming existence between the video transmission devices 13 in this surveillance camera system will be described with reference to FIG.
The image transmission devices 13 of this monitoring camera system regularly monitor each other's existence while performing an operation of transmitting image information by wireless communication, and confirm the communication state of each image transmission device 13. Perform confirmation operation. This operation is a feature of this surveillance camera system.

Here, the video transmission device 13 of the monitoring camera system constructs a ring-shaped (loop-shaped) wireless link, and performs wireless communication in a preset forward direction or in a reverse direction, which is the opposite direction. In this embodiment, the forward direction is video transmission device (1)→video transmission device (2)→video transmission device (3)→video transmission device (n)→video transmission device (1).

Then, when the preset timing for confirming survival comes, the video transmission device (1), which is the management device on the transmission side, starts transmitting a survival confirmation signal in the forward direction.
The video transmission device (2) that has received the survival confirmation signal transmits a response indicating normal operation to the transmission source video transmission device (1), and the next video transmission device (3) is alive. Send a confirmation signal.

Likewise, when each video transmission device 13 receives a survival confirmation signal in the forward direction, it transmits a response to the transmission source, and transmits the survival confirmation signal to the next video transmission device 13 in the forward direction.
Then, when video transmission device (1), which is the transmission side management device, receives a survival confirmation signal from video transmission device (n), the transmission side management device determines that all video transmission devices 13 are operating normally. It recognizes it and writes the survival status (indicating "all alive") in the video transmission device management table described later.

Next, a case where no response is returned even though the video transmission device 13 has transmitted a survival confirmation signal in the forward direction will be described.
For example, if the video transmission device (k) transmits a survival confirmation signal to the video transmission device (k+1) and there is no response from the video transmission device (k+1) within a certain period of time, the video transmission device (k) performs video transmission. A failure notification indicating that a failure has occurred in device (k+1) is transmitted in the opposite direction to the transmission direction of the keep-alive signal. That is, video transmission device (k) transmits a failure notification to video transmission device (k-1).

The video transmission device (k-1) that has received the failure notification forwards the failure notification to the video transmission device (k-2) in the opposite direction. Thereafter, the failure notification is transferred sequentially in the opposite direction to the transmission side management device.

When video transmission device (1), which is the transmission side management device, receives the failure notification transmitted in the reverse direction, it holds the contents of the failure notification indicating that a problem has occurred in video transmission device (k+1). , this time to send a keep-alive signal in the opposite direction. That is, the transmission-side management device transmits a survival confirmation signal to the video transmission device (n).
Even when the survival confirmation signal is transmitted in the reverse direction, as in the case of the forward direction, each video transmission device 13, upon receiving the survival confirmation signal, transmits a response to the transmission source, and sends it to the next video transmission device 13. Send a live signal.

Here, since a failure occurs in the video transmission device (k+1), when a survival confirmation signal is transmitted from the video transmission device (k+2) in the opposite direction to the video transmission device (k+1), no response is obtained.
Then, the video transmission device (k+2) transmits a fault notification indicating that the video transmission device (k+1) has a problem in the forward direction, which is the direction opposite to the transmission direction of the survival confirmation signal. That is, the video transmission device (k+2) transmits a fault notification to the video transmission device (k+3).

Then, when the management device on the transmission side receives a failure notification in the forward direction (received from the video transmission device (n)), it compares the content of the failure notification with the failure content already held, and if they match, the failure is detected. I am trying to identify the location. That is, the transmission-side management device recognizes that a failure has occurred in the video transmission device (k+1), and updates the video transmission device management table.
As a result, in this monitoring camera system, the failure location can be detected from two directions, the forward direction and the reverse direction, and the failure of the video transmission device 13 can be reliably detected.

[Processing of transmission side management device: FIG. 5]
The processing of the transmission-side management device accompanying the existence confirmation will be described with reference to FIG. FIG. 5 is a flow chart showing the processing of the transmission side management device.
As shown in FIG. 5, the transmission-side management device first transmits a survival confirmation signal in the forward direction (100), waits for the reception of the survival confirmation signal in the forward direction or the failure notification in the reverse direction, and receives the A decision is made as to whether it is a survival confirmation signal or a failure notification (102).

When the survival confirmation signal is received in the forward direction, the management device on the transmission side determines that all the video transmission devices 13 are operating normally (120), and shifts to processing 130. FIG.

Also, in the process 102, when a failure notification is received in the reverse direction, the transmission side management device saves the details of the failure (104) and transmits a survival confirmation signal in the reverse direction (106).
Then, the transmission-side management device waits for reception of a failure notification in the forward direction (108), compares the failure details of the failure notification with the stored failure details, and determines whether they match (110). ).

If the contents of the failure do not match, the transmission side management device returns to the process 100 and transmits the survival confirmation signal in the forward direction again (100).
If the failure contents match in process 110 (Yes), the transmission-side management device identifies the location of the failure, proceeds to process 130, writes the failure information, and updates the video transmission device management table.

Then, the management device on the receiving side distributes the updated video transmission device management table to the other video transmission devices 13 in the forward direction or the reverse direction (132). At that time, the management device on the transmission side transmits survival information of all the video transmission devices 13 to the management device on the reception side.

The other video transmission device 13 that has received the video transmission device management table copies and stores it in the database unit 134 of its own device, and transfers it to the next video transmission device 13 . It should be noted that the video transmission device 13 in which the failure has occurred is skipped and transferred.
As a result, all video transmission devices 13 in the alive state can share the same video transmission device management table.
In this way, the processing of the transmission side management device is performed.

[Another operation for confirming survival (1)]
Another operation (1) of survival confirmation will be described.
The transmission-side management device transmits a life confirmation signal in the forward direction, and if the video transmission device 13 does not respond to the life confirmation signal in the forward direction, the operation of transmitting the fault notification in the reverse direction is the same as the above example. is.
However, the transmission-side management device does not transmit the survival confirmation signal in the reverse direction after holding the content of the fault notification.
When a failure occurs in the video transmission device 13(p), the survival confirmation signal is not transmitted to the next video transmission device 13(p+1).

Each video transmission device 13 stores in advance the timing (time) of start of life confirmation, and waits for a life confirmation signal at the life confirmation time.
Then, if no survival confirmation signal is received even after a predetermined time has elapsed from the start of the survival confirmation, the video transmission device 13(p+1) spontaneously switches to the previous video transmission device 13(p) in the forward direction. ) in the forward direction to the next video transmission device 13 (p+2).

Then, each video transmission device 13 after the video transmission device 13(p+2) also sequentially transmits the failure notification and the survival confirmation signal in the forward direction, and the transmission side management device receives the failure notification and the survival confirmation signal.
The transmission-side management device collates the content of the failure notification received in the reverse direction with the content of the failure notification received in the forward direction, identifies the location of the failure, and updates the video transmission device management table.
In this way, another operation (1) of confirming survival is performed. In other words, in another operation (1), survival confirmation is performed only in the forward direction, and failure notification is transmitted in two directions, the forward direction and the reverse direction.
In another operation (1) for confirming survival, the two video transmitters 13 adjacent to the location where the failure occurs detect the failure, so that the occurrence of the failure can be reliably detected.

[Another operation for confirming existence (2)]
In another life confirmation operation (2), when there is no response to the life confirmation signal in the forward direction, the video transmission device 13 does not transmit a failure notification in the reverse direction, but rather transmits video in the absence of the response. The device 13 is skipped and the survival confirmation signal and the fault notification are transmitted to the next video transmission device 13 .

In this case, a survival confirmation signal and a fault notification are forwardly transmitted to the transmitting side management device. There is no confirmation of existence in the opposite direction and transmission of a failure notification, and confirmation of the location of failure in two directions is not performed, but this method is suitable when it is desired to identify the location of failure quickly.

Whether to perform survival confirmation in the reverse direction (operation in FIG. 5), to perform survival confirmation only in the forward direction (another operation (1)), or to make failure notification only in the forward direction (another operation (2)) The setting can be changed at any time by an operation from the terminal device 16 .

[Video transmission device management table: FIG. 6]
Next, the video transmission device management table stored in the database unit 134 of the video transmission device 13 will be explained using FIG. FIG. 6 is an explanatory diagram of a video transmission device management table.
In the following description, a system in which five cameras 11, five video transmitting devices 13, and five video receiving devices 15 are provided will be described. Since one of the video receivers 15 is connected to the information storage device 17 , four video receivers 15 can be connected to the video transmitter 13 .

Specifically, cameras 11 are cameras (1) to (5), video transmission devices 13 are video transmission devices (1) to (5), and video reception devices 15 are video reception devices (1) to (5). ) and the video receiving device (5) is connected to the information storage device 17. FIG.

As shown in FIG. 6, the video transmission device management table stores, for each video transmission device 13, the survival confirmation order, survival information, the number of the transmission side management device, and the information of the video reception device 15 to be connected.
"Order of survival confirmation" indicates the order of transmission of the survival confirmation signal. The order from top to bottom indicates the order in the forward direction, and the order from bottom to top indicates the order in the reverse direction. ing.
For example, the survival confirmation order corresponding to video transmission device (2) is stored in order from the top: video transmission device (3), video transmission device (4), video transmission device (5), video transmission device (1). there is
Therefore, when the video transmission device (2) receives the forward survival confirmation signal, it transmits the survival confirmation signal to the video transmission device (3), and when it receives the backward survival confirmation signal, the video transmission device (1) Send to

"Alive information" is the state of existence of each video transmission device 13 detected by survival confirmation, and FIG. 6 indicates that all video transmission devices 13 are alive (normally operating). The survival information in the video transmission device management table is updated by the transmission side management device through the processing shown in FIG.
"Transmission side management device" indicates the transmission side management device currently set, and indicates that the video transmission device (1) is the transmission side management device.

“Connected video receiving device” indicates the destination to which video information is to be transmitted.
Here, since there are five video transmission devices 13 and four video reception devices 15 that can be connected, video transmission device (1) and video transmission device (5) transmit video information to video reception device (1). is configured to send
In the table of FIG. 6, the information of the transmission side management device and the information of the video reception device to be connected are updated according to the instruction of the reception side management device. This operation will be described later.

The video transmission device management table updated by the transmission side management device is distributed to all the video transmission devices 13 from the transmission side management device. Specifically, in the same way as the survival confirmation signal described above, the video transmission device management table is transmitted in the forward direction or the reverse direction from the transmission side management device, and each video transmission device 13 internally stores the received video transmission device management table. , and then transmit.
As a result, all the video transmission devices 13 can hold the same video transmission device management table, and can share survival information and connection information.

[Operation of survival confirmation in video receiving device 15: FIG. 1]
Next, the operation of confirming existence between the video receiving devices 15 in this surveillance camera system will be described with reference to FIG.
In this monitoring camera system, during wireless communication, the video receiving device 15 also periodically performs a survival confirmation operation for confirming the mutual communication state in the same manner as the above-described survival confirmation in the video transmission device 13 .
Similarly to the video transmission device 13, the video reception device 15 uses the loop wireless link to communicate in the forward direction or the reverse direction, confirms survival, and specifies the location of the failure.

The life confirmation operation in the video receiving device 15 is performed starting from the receiving side management device, and the processing is the same as the processing of the transmission side management device shown in FIG. 5, so the explanation is omitted.
Then, the management device on the receiving side writes and updates the detected survival information in a video reception device management table, which will be described later.
The updated video receiver management table is distributed from the receiving side management device to all the video receivers 15 via the wireless link, and all the video receivers 15 hold the same video receiver management table. there is

[Video Receiving Device Management Table: FIG. 7]
Next, the video receiver management table stored in the database unit 154 of the video receiver 15 will be described with reference to FIG. FIG. 7 is an explanatory diagram of the video receiver management table. As described above, as the video receiving device 15, five video receiving devices (1) to (5) are provided.
As shown in FIG. 7, the video receiver management table includes, for each of the video receivers (1) to (5), a connection device, a video transmission device to be connected (transmitting device to be connected), a survival confirmation order, survival information, The number of the receiving side management device, priority connection destination information, and storage information are stored.

The "connection device" is information about devices connected by wire. Video reception devices (1) to (4) are connected to terminal devices (1) to (4), respectively, and video reception device (5) stores information. Indicates that the device 17 is connected.
"Transmitting device to be connected" is information indicating from which video transmitting device 13 video information is to be received. Video receiving device (1) receives from video transmitting device (1) and video transmitting device (5), The video receiving device (2) is set to receive from the video transmitting device (2), the video receiving device (3) is set to receive from the video transmitting device (3), and the video receiving device (4) is set to receive from the video transmitting device (4). .

The "survival confirmation order" is the order in which the above-described survival confirmation is performed. The order from top to bottom indicates the order in the forward direction, and the order from bottom to top indicates the order in the reverse direction.
"Alive information" is the state of existence of each video receiving device 15 detected by the life confirmation, and FIG. 7 shows that all the video receiving devices 15 are operating normally. Although illustration is omitted, survival information of the terminal device 16 and the information storage device 17 connected to each video receiving device 15 is also stored as the survival information.
The information of "receiving side management device" indicates the currently set receiving side management device, and indicates that the video receiving device (1) is the receiving side management device. The receiving side management device is set by an instruction from a specific terminal device 16 .

“Stored information” indicates video information actually stored in the terminal device 16 or the information storage device 17 connected to each video reception device 15 .
The example of FIG. 7 shows a state in which all the video receiving device 15, the terminal device 16, and the information storage device 17 are operating normally. ) to (5) are all stored in the information storage device.

"Priority connection destination information" is a characteristic part of this monitoring camera system. It defines whether to transfer or not.

When the information storage device 17 is operating normally, the video receiving devices (1) to (4) output the received video information to the connected terminal device 16 and also to the video receiving device (5). Since the information is transferred and stored in the information storage device 17, even if video information is received from a large number of video transmission devices 13, the load on the terminal device 16 does not increase significantly.
However, if a problem occurs in the information storage device 17 (or the video reception device (5) connected thereto), the terminal device 16 stores the received video information in the internal information storage unit 164 as described above. do. Therefore, if video information concentrates on a specific terminal device 16, there is a possibility that it may not be possible to store all of the video information.

The priority connection destination information is information for avoiding concentration of video information on a specific terminal device 16 . In this monitoring camera system, the priority connection destination information is set so as to distribute the image information so that the load (the amount of image information to be accumulated) of each terminal device 16 becomes as uniform as possible. Normally, the priority connection destination information is set before system operation starts.

In the example of FIG. 7, for example, when a failure occurs in the video receiving device (2), the video information of the video transmitting device (2) connected to the video receiving device (2) is given priority corresponding to the video receiving device (2). In accordance with the connection destination information, the data is transferred in the priority order of video receiving device (3), video receiving device (4), and video receiving device (1).
Furthermore, if the connection destination with the higher priority is not alive, it is transferred to the lower connection destination.

Further, in the example of FIG. 7, since the video receiving device (1) is originally set to receive video information from two video transmitting devices 13, the priority connection destination corresponding to the other video receiving device 15 is is set to have a low priority.
As a result, when a failure occurs in the information storage device 17, the possibility that the terminal device (1) connected to the video reception device (1) will accumulate the video information from the three video transmission devices 13 is reduced. The video information can be stored by sharing with other video receiving devices 15, and the video information can be reliably accumulated.

[Video transmission device monitoring table: FIG. 8]
Next, the video transmission device monitoring table stored in the database unit 154 of the video reception device 15 will be described with reference to FIG. FIG. 8 is an explanatory diagram of a video transmission device monitoring table.
The video transmission device monitoring table is generated by the receiving side management device (here, video reception device (1)), distributed to all the video reception devices 15, and stored.

As shown in FIG. 8, the video transmission device monitoring table stores the number of the video transmission device 13, the camera number, and survival information in correspondence with the priority (order) of the video transmission device 13. FIG.
"Priority" indicates the order of priority for changing the transmission destination of image information in the video transmission device 13 when a failure occurs in the video reception device 15 or the information storage device 17. It is.
As mentioned above, the priority is set according to the importance of the monitored area captured by the corresponding camera, which is to ensure that important footage is still available even in the event of equipment failure in the system. This is so that it can be saved.

In the example of FIG. 8, video transmission device (1) has the highest priority, followed by video transmission device (2), video transmission device (3), and so on.
Priorities are set, for example, from the terminal device 16 before system operation is started.

The “camera number” is information indicating which camera each of the video transmission devices 13 transmits video information captured by.
"Alive information" is the survival information of each video transmission device 13 received from the transmission side management device, and in the example of FIG. 8, all the video transmission devices 13 are operating normally.

As described above, all the video receivers 15 hold the video receiver management table shown in FIG. 7 and the video transmitter monitor table shown in FIG. By sharing the connection information and survival information among all the video receiving devices 15, it is possible to smoothly switch the connection destination when a failure occurs in the information storage device 17 or one of the video receiving devices 15. is.

[Processing of receiving side management device when failure occurs in information storage device: FIGS. 6, 7, 9, 10, and 11]
Next, FIG. 9 shows the processing of the receiving side management device when a failure occurs in the information storage device 17 or in the video receiving device (5) connected to the information storage device 17 (hereinafter referred to as "information storage device 17"). , will be described with reference to FIG. FIG. 9 is a flow chart showing the processing of the receiving side management device when a failure occurs in the information storage device, and FIG. FIG. 11 is an explanatory diagram showing the contents of the management table, and FIG. 11 is an explanatory diagram of the updated video receiver management table.

The management device on the receiving side (here, the video receiver (1) 15-1) obtains the survival information of the video receiver 15, the terminal device 16, and the information storage device 17 by the survival confirmation process performed periodically, and displays the video. Stored in the receiver management table.
When it is detected that a failure has occurred in the information storage device 17 and the video receiving device (2) by the survival confirmation process, as shown in FIG. Then, "x" is stored.

When the management device on the receiving side detects that the information storage device 17 has failed, it starts the processing shown in FIG. At the same time, each terminal device 16 is instructed to store the video information (200). Accordingly, the video information transmitted from the video transmission device 13 is stored in the information storage unit 164 of the terminal device 16 without being transferred to the information storage device 17 .

Next, the management device on the receiving side refers to the internally stored video receiver management table to determine whether or not there is a faulty video receiver 15 (202). If there is no 15 (see FIG. 7), the process ends.

Also, in the processing 202, if there is a video receiving device 15 in trouble (see FIG. 10), the receiving side management device refers to the video receiving device management table and connects to the video receiving device 15. The video transmission device 13 is specified (204), and the survival information is confirmed by referring to the video transmission device monitoring table.
For example, as shown in FIG. 10, when a failure occurs in video receiving device (2), the receiving side management device indicates that only video transmitting device (2) is connected to video receiving device (2). , to be alive.

Next, the management device on the reception side instructs the management device on the transmission side to change the connection destination (destination of image information) of the video transmission device 13 connected to the video reception device 15 in which the failure has occurred. to output
At this time, the management device on the receiving side refers to the video reception device management table, reads (206) the priority connection destination corresponding to the video reception device 15 in which the failure has occurred, and selects a connection that has a high priority and is alive. destination is selected as a new connection destination of the video transmission device 13, and the transmission side management device updates the connection destination of the video transmission device management table (208).

Specifically, as shown in FIG. 10, as a priority connection destination corresponding to video receiving device (2), video receiving device (3) has the highest priority and is still alive. The device selects the video receiving device (3) as a new connection destination of the video transmitting device (2) connected to the video receiving device (2) in failure, and transmits video to the transmission side management device. The video receiving device (2) instructs the video receiving device (3) to update the information of the "connected video receiving device" corresponding to the video transmitting device (2) in the device management table.
As a result, the transmission-side management device updates the "connected video reception device" corresponding to the video transmission device (2) to the video reception device (3) in the video transmission device management table shown in FIG. It distributes to the transmission device 13 .

Then, the management device on the reception side updates the internally stored video reception device management table based on the instruction to the management device on the transmission side and distributes it to each video reception device 15 (210).
That is, as shown in FIG. 11, in the video receiving device management table, the "transmitting device to be connected" and "storage information" corresponding to the video receiving device (2) are blank, and the " Assume that the "transmitting device to be connected" is the video transmitting device (2) and the video transmitting device (3), and the "stored information" is the camera (2) and the camera (3).

In this way, the processing of the reception side management device when a failure occurs in the information storage device 17 is performed. A terminal device that transfers video information from a video transmission device 13 connected to the video reception device 15 to another video reception device 15 in accordance with information on a priority connection destination and survival information, and connects to another video reception device 15. 16 can be saved.

In addition, in the process 204 of FIG. 9, if there are a plurality of video transmission devices 13 connected to the video reception device 15 in trouble, the management device on the reception side follows the video transmission device monitoring table shown in FIG. The process of rewriting the connection destination is performed in order from the video transmission device 13 having the highest priority.

Furthermore, when the management device on the receiving side confirms that the information storage device 17 has been restored by periodic survival confirmation, it instructs each video reception device 15 to resume transfer to the information storage device 17, and each terminal device 16 to transfer the video information stored therein to the information storage device 17 .
As a result, the video information temporarily accumulated in the terminal device 16 can be stored in the information storage device 17 .

[Effects of Embodiment]
According to the monitoring camera system according to the present embodiment, a plurality of video transmission devices 13 for transmitting video captured by the camera 11, a plurality of video reception devices 15 for receiving the video, and a Equipped with a terminal device 16 and an information storage device 17 for storing images received by the image receiving device 15, a plurality of image transmitting devices 13 form a ring communication network in which forward or backward communication is performed wirelessly. A plurality of video transmission devices 13(k) other than the video transmission device 13(1), which is the transmission-side management device, responds to the transmission source upon receiving the survival confirmation signal, and the next video transmission device 13(k+1) or When the operation of transmitting a survival confirmation signal to the video transmission device 13(k−1) is performed and no response is received from the next video transmission device 13, the next A failure notification indicating that a failure has occurred in the video transmission device 13 (k+1) or the video transmission device 13 (k−1) is transmitted, and the video transmission device 13 (1), which is the transmission side management device, first A survival confirmation signal is transmitted in the forward direction, and when the survival confirmation signal is received in the forward direction, all the video transmission devices 13 are recognized as normal, and when a failure notification is received in the reverse direction, the content of the failure notification is retained. At the same time, a survival confirmation signal is transmitted in the reverse direction, and when a failure notification is received in the forward direction after that, the contents of the stored failure notification are collated to specify the video transmission device 13 in which the failure has occurred. This is a surveillance camera system that cyclically monitors life from two directions. Therefore, if a failure occurs in one of the video transmission devices 13, the two video transmission devices 13 adjacent to that device on the communication network , the occurrence of a failure can be confirmed, and there is an effect that the failure can be reliably detected.

That is, according to this surveillance camera system, a plurality of video transmission devices 13 form a ring communication network that wirelessly communicates in the forward or reverse direction, and the video transmission device 13 (the transmission side management device) With 1) as the starting point, survival confirmation is performed in the forward direction, and when a failure is detected, survival confirmation is performed in the reverse direction as well, and the transmission side management device is detected in two directions, the forward direction and the reverse direction. Since the content of the failure occurrence is collated to identify the location of the failure, there is an effect that the failure of the video transmission device 13 can be reliably detected.
In addition, since it is possible to continue to operate the device group other than the faulty device, there is an effect that the other device group excluding the faulty device can perform patrol monitoring again.

Further, according to this surveillance camera system, a plurality of video transmission devices 13 for transmitting video captured by the camera 11, a plurality of video reception devices 15 for receiving the video, and a terminal device 16 connected to the video reception device 15 and an information storage device 17 for storing the video received by the video receiving device 15, and the plurality of video receiving devices 15 form a ring communication network in which forward or reverse communication is performed wirelessly. A plurality of video transmission devices 15(k) other than the video reception device 15(1), which is the side management device, responds to the transmission source upon receiving the survival confirmation signal, and at the same time, the next video reception device 15(k+1) or the video reception device 15(k−1), the operation of transmitting a life confirmation signal is performed, and if no response is received from the next video reception device 15, the next video reception is performed in the direction opposite to the transmission direction of the life confirmation signal. The device 15(k+1) or the video receiving device 13(k-1) transmits a fault notification indicating that a fault has occurred, and the video receiving device 15(1), which is the management device on the receiving side, first sends a life confirmation signal. is transmitted in the forward direction, and when a survival confirmation signal is received in the forward direction, it is recognized that all the video receiving devices 15 are normal. When a survival confirmation signal is transmitted in the forward direction and then a failure notification is received in the forward direction, an operation is performed to identify the video receiving device 15 in which the failure has occurred by comparing with the content of the failure notification held. Since the surveillance camera system is configured to cyclically monitor survival from two directions, if a failure occurs in one of the video receivers 15, the two video receivers 15 adjacent to that device on the communication network will fail. can be confirmed, and failures can be reliably detected.

That is, according to this surveillance camera system, a plurality of video receiving devices 15 form a ring communication network that communicates wirelessly in the forward direction or the reverse direction, and the video receiving device 15 (the receiving side management device) ( With 1) as the starting point, survival confirmation is performed in the forward direction, and when a failure is detected, survival confirmation is performed in the reverse direction as well, and the receiving side management device is detected in both the forward direction and the reverse direction. Since the content of the failure occurrence is collated to specify the location of the failure, there is an effect that the failure of the video receiving device 15 can be reliably detected.

In addition, according to this monitoring camera system, when a failure occurs in the information storage device 17 or in the video receiving device 15 connected thereto, the video information received by the video receiving device 15 connected thereto is stored in the terminal device 16. , so there is an effect that video information can be saved without loss.

In addition, according to this monitoring camera system, when a failure occurs in one of the video receiving devices 15(k) in addition to the information storage device 17, the receiving side management device (for example, the video receiving device 15(1)) The connection destination stored in the video transmission device management table corresponding to the video transmission device 13 connected to the failed video reception device 15(k) is determined based on preset priority connection destination information. , the transmission-side management device (for example, the video transmission device 13(1)) is instructed to replace the failed video reception device 15(k) with another video reception device 15(i). Even if the storage device 17 and some of the video receiving devices 15 fail, the video information can be reliably stored, and the load on the video receiving devices 15 can be evened out as much as possible.

In addition, according to this monitoring camera system, when the image transmission device 13 cannot connect to the information aggregation device 14 by wire or connect to the image reception device 15 by radio, the image transmitted from the monitoring camera 11 is The stored image information is stored in the internal information storage unit 135, so that even if wired or wireless communication is disabled, the image information can be reliably saved, and when the communication is restored, the saved image information can be restored. There is an effect of being able to transmit to the video receiving device 15 side.

INDUSTRIAL APPLICABILITY The present invention is particularly suitable for a monitoring camera system that can monitor and record images without delay even when a malfunction occurs in some of the devices.

DESCRIPTION OF SYMBOLS 11... Camera 12... Relay apparatus 13... Video transmission apparatus 14... Information aggregation apparatus 15... Video reception apparatus 16... Terminal device 17... Information storage apparatus 131, 151, 161... Control part 132, 152 , 162... wired communication unit, 133, 153... wireless communication unit, 134, 154, 163... database unit, 135, 164... information storage unit

Claims (5)

A surveillance camera system,
a plurality of surveillance cameras for photographing a surveillance target;
a plurality of video transmission devices each connected to the plurality of surveillance cameras and transmitting video data captured by the surveillance cameras;
a plurality of video receiving devices that receive video data transmitted from the plurality of video transmitting devices;
an information storage device connected to one of the plurality of video receiving devices and storing video data;
a plurality of terminal devices each connected to a plurality of video receiving devices to which the information storage device is not connected;
an information aggregation device that distributes video data transmitted from the plurality of video transmission devices to a plurality of video reception devices connected to the terminal device ;
The video reception device connected to the terminal device transfers the received video data to the video reception device connected to the information storage device, and the video reception device connected to the information storage device receives the transferred video data. receiving data and outputting it to the information storage device;
The plurality of video transmission devices form a ring communication network that communicates in the forward direction or the reverse direction by radio, and survival confirmation is performed in the forward direction starting from a specific video transmission device that is a transmission-side management device. When a failure is detected, survival is confirmed in the reverse direction as well, and the specific video transmission device collates the content of the failure detected in the two directions of the forward direction and the reverse direction to detect the failure. A surveillance camera system characterized by specifying a location of occurrence. A surveillance camera system,
a plurality of surveillance cameras for photographing a surveillance target;
a plurality of video transmission devices each connected to the plurality of surveillance cameras and transmitting video data captured by the surveillance cameras;
a plurality of video receiving devices that receive video data transmitted from the plurality of video transmitting devices;
an information storage device connected to one of the plurality of video receiving devices and storing video data;
a plurality of terminal devices each connected to a plurality of video receiving devices to which the information storage device is not connected;
an information aggregation device that distributes video data transmitted from the plurality of video transmission devices to a plurality of video reception devices connected to the terminal device ;
The video reception device connected to the terminal device transfers the received video data to the video reception device connected to the information storage device, and the video reception device connected to the information storage device receives the transferred video data. receiving data and outputting it to the information storage device;
The plurality of video receiving devices form a ring communication network that communicates in the forward direction or the reverse direction by radio. When a failure is detected, survival is confirmed also in the reverse direction, and the specific video receiving device compares the content of the failure detected in the two directions of the forward direction and the reverse direction, and detects the failure. A surveillance camera system characterized by identifying a location of occurrence. A surveillance camera system,
a plurality of surveillance cameras for photographing a surveillance target;
a plurality of video transmission devices each connected to the plurality of surveillance cameras and transmitting video data captured by the surveillance cameras;
a plurality of video receiving devices that receive video data transmitted from the plurality of video transmitting devices;
an information storage device connected to one of the plurality of video receiving devices and storing video data;
a plurality of terminal devices each connected to a plurality of video receiving devices to which the information storage device is not connected;
an information aggregation device that distributes video data transmitted from the plurality of video transmission devices to a plurality of video reception devices connected to the terminal device ;
The video reception device connected to the terminal device transfers the received video data to the video reception device connected to the information storage device, and the video reception device connected to the information storage device receives the transferred video data. receiving data and outputting it to the information storage device;
A monitoring camera system, wherein when a failure occurs in a video receiving device connected to the information storage device, the terminal device temporarily stores video data received by the connected video receiving device. The video transmission device temporarily stores the video data captured by the connected surveillance camera when it detects that the transmission to the video reception device or the information aggregation device is impossible. Item 4. The surveillance camera system according to any one of Items 1 to 3. 3. When the video transmitting device and the video receiving device detect that communication with the information aggregation device is impossible, the video data is transmitted and received by wireless communication by switching to wireless communication. 5. The surveillance camera system according to any one of 4.

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