JP2003259342A - Remote monitor apparatus and remote monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a remote monitor apparatus and a remote monitoring system capable of easily confirming a state of a site being a monitor object with a still picture. <P>SOLUTION: The remote monitor apparatus is provided with: a plurality of video input terminals Vi; an input changeover means 21 for switching and selecting a video image received at each terminal Vi; a still picture acquisition means 29 for acquiring a still picture from the video image selected by the input changeover means 21; a storage means 30 for storing the still picture acquired by the still picture acquisition means 29; a first control means 31, in response to reception of control data by a communication I/F 35 for requesting transmission of a plurality of still pictures arranged in either of a time series mode and a camera dependent time series mode, reducing a plurality of still pictures stored in the storage means 30, allows the storage means 30 to produce a list image arranged in the mode, and transmitting the list image through the I/F 35; and a second control means 31 for reading a requested still picture from the storage means 30 and transmitting the still picture through the communication I/F 35 on the basis of the reception of the control data for requesting the transmission of the one still picture shown in the list image at the communication I/F 35. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring device and a remote monitoring system, and more particularly to a remote monitoring device and a remote monitoring system for facilitating confirmation of a situation of a site to be monitored.

[0002]

2. Description of the Related Art It is common practice to monitor the occurrence of crimes and fires at a site at a place other than the site.

That is, video cameras for monitoring are arranged at entrances and exits of facilities (for example, a company building or factory of a certain company), parking lots, etc., and the images taken by these video cameras are kept in the guard room in the same facility. Is displayed on the monitor.

Further, in an emergency (when an alarm signal is generated from a sensor arranged at a doorway or a parking lot, etc.), images taken by those video cameras are separated from the facility (for example, the facility). It is also being sent to a company building in another area of the company or a building of a security company via a network for display on a monitor.

In the present specification, the facility including the monitored site such as the entrance and exit and the parking lot is called "remote place", and the facility to which the image is transmitted from the facility via the network is called "monitoring center". To

Conventionally, when the alarm signal is generated, in order to confirm the situation of the site before and after the alarm signal is generated on the monitoring center side, a large number (for example, several tens) of still images acquired from the video image captured by the video camera are used. The images were sent to the surveillance center via the network one by one from a remote location.

[0007] Conventionally, when a plurality of still images are displayed on a monitor in a guard room in a remote place or a plurality of still images are displayed on a monitor of a surveillance center, a doorway, a parking lot, or the like is displayed. Regardless of which video camera among multiple video cameras placed on site, those still images are displayed in chronological order (arranged in order of shooting time). Was there.

[0008]

However, many networks have a narrow communication band, and it takes a long time to finish transmitting and receiving a large number of still images between a remote location and a surveillance center via such a network. Resulting in. Therefore, conventionally, even if an alarm signal is generated, there is a problem that it is difficult for the monitoring center side to check the situation of the site before and after the alarm signal is generated.

Further, when a plurality of still images are displayed in a time-series list on the monitor, it is difficult to know which still image was taken by which video camera at which site. Therefore, conventionally, there has been a problem that it is difficult to confirm the situation of each individual site in a guard room or a monitoring center side in a remote place.

In view of the above points, the present invention has an object to make it easy to confirm the situation of the monitoring target site by a still image in a remote guard room or a monitoring center.

[0011]

In order to solve this problem, the present applicant has switched and selected a plurality of video input terminals and the video input to each one of these video input terminals. Input switching means, a still image acquisition means for acquiring a still image from the video selected by the input switching means, a storage means for accumulating the still image acquired by the still image acquisition means, and a video output terminal, First operation means for designating time series or time series by camera (a mode in which each camera is arranged in order of time taken by the camera) as a mode of arrangement of a plurality of still images; Second operation means for instructing the display of a list of still images, and based on the operation of the second operation means, the plurality of still images accumulated in the accumulating means are reduced and designated by the first operating means. Create a list image arranged in a different manner, A first control means for outputting a preview image from the video output terminal, a third operating means for selecting one still image in the list image, and a still image selected by the third operating means, A remote monitoring device including a second control unit that reads out from the storage unit and outputs from the video output terminal is proposed.

When the remote monitoring device is arranged in a guard room in a remote place and the images taken by a plurality of video cameras arranged at the site to be monitored are input to the image input terminal of the remote monitoring device, 1 The images captured by the video cameras one by one are switched and selected by the input switching unit, the still images are acquired from the switched and selected images by the still image acquiring unit, and the still images are accumulated in the accumulating unit.

Then, when the arrangement mode is designated by the first operation means and the list display is instructed by the second operation means, the first control means reduces the plurality of still images accumulated in the accumulating means. Then, the list image arranged in this designated manner is created, and the list image is output from the video output terminal, so that the list image is displayed on the monitor connected to the video output terminal.

Therefore, when the time series for each camera is designated by the first operating means, a plurality of reduced still images are displayed on the monitor for each video camera at the time when they were taken by the video camera. The list images arranged in order are displayed.

In this way, a plurality of still images are arranged in time series for each camera and displayed as a list, which makes it easy to understand which still image was taken by which video camera.

Then, when a still image taken by a video camera at the site to be confirmed is selected from the list image by the third operation means, the selected still image is accumulated by the second control means. It is read from the means, is output from the video output terminal, and is enlarged and displayed on the monitor.

As a result, it becomes easy to confirm the situation of the monitored site by a still image in the guard room in the remote place.

In this remote monitoring device, as an example, an alarm signal input terminal, a fourth operation means for setting the number of still images to be acquired by the still image acquisition means after the alarm signal is generated, and an alarm. After the alarm signal is input to the signal input terminal, when the number of still images set by the fourth operating means is obtained, a third control means for stopping the still image obtaining means by the still image obtaining means is provided. It is preferable to further provide.

If the number of images set by the fourth operation means is reduced, the number of still images acquired after the alarm signal is generated and stored in the storage means under the control of the third control means is reduced. . Therefore, the list image displayed on the monitor has a large proportion of the number of still images acquired before the alarm signal is generated. As a result, it becomes possible to intensively check the situation at the site before the alarm signal is generated.

On the contrary, if the number of images set by the fourth operation means is increased, the number of still images acquired after the alarm signal is generated and accumulated in the accumulating means under the control of the third control means. Will increase. Therefore, the list image displayed on the monitor has a large proportion of the number of still images acquired after the alarm signal is generated. As a result, it becomes possible to focus on the situation of the site after the alarm signal is generated.

As described above, it becomes possible to arbitrarily select which of the situation before the alarm signal is generated and the situation after the alarm signal is focused on from the still image.

Further, in this remote monitoring device, as an example, a communication interface for communicating via a network and control data for requesting transmission of a list image in either a time series or a time series by camera And a third control means for reducing the plurality of still images accumulated in the accumulating means to create a list image arranged in that manner based on the reception of the list image through the communication interface, and transmitting the list image from the communication interface. Further comprising fourth control means for reading out the still image from the storage means and transmitting the still image from the communication interface on the basis that the control data requesting transmission of one still image in the list image is received by the communication interface. Is preferred.

As a result, based on the request from the monitoring center side, this list image and one still image selected from the list image can be transmitted from a remote place to the monitoring center via the network.

Therefore, it becomes easy for the monitoring center side to confirm the situation of the monitoring target site by the still image.

As described above, first, the list image is transmitted to the monitoring center via the network, and then only the still image selected from the list image on the monitoring center side is transmitted to the monitoring center via the network. ,
The time required for transmission / reception can be shorter than in the case where individual still images forming this list image are transmitted to the monitoring center via the network one by one.

Therefore, also in this respect, it becomes easy for the monitoring center side to confirm the situation of the monitoring target site by the still image.

Next, the applicant of the present invention designates a communication interface for performing communication via a network, a video output terminal, and a time series or camera-based time series as a mode of arrangement of a plurality of still images. First operation means, and second operation means for instructing a list display of a plurality of still images,
Based on the operation of the second operation means, control data requesting transmission of a list image in which a plurality of still images are reduced and arranged in the mode designated by the first operation means is transmitted from the communication interface, and the control data is transmitted. Output the list image received by the communication interface from the video output terminal according to the first
From the communication interface, the control means, the third operation means for selecting one still image in the list image, and the control data for requesting the transmission of the still image selected by the operation of the third operation means. A remote monitoring device is provided, which includes a second control unit that transmits a still image received from a communication interface according to the control data and outputs the still image from a video output terminal.

When this remote monitoring device is arranged in the monitoring center and the arrangement mode is designated by the first operating means and the list display is instructed by the second operating means, a plurality of still images are displayed by the first controlling means. The control data for requesting the transmission of the list images arranged in the designated manner after being reduced is transmitted via the network.

When the list image is received via the network according to the control data, the list image is output from the video output terminal by the first control means.
The list image is displayed on the monitor connected to the video output terminal.

Therefore, when the time series for each camera is designated by the first operating means, a plurality of reduced still images are displayed on the monitor, for example, for each video camera installed at a plurality of remote sites. , A list image arranged in the order of time taken by the video camera will be displayed.

As described above, a plurality of still images are arranged in time series for each camera and displayed as a list, which makes it easy to understand which still image was taken by which video camera.

Then, when the still image taken by the video camera at the spot to be confirmed is selected from the list image by the third operation means, the second control means transmits the selected still image. The requested control data is sent over the network.

When a still image is received via the network in accordance with this control data, the second image is output from the video output terminal by the second control means and is enlarged and displayed on the monitor.

As a result, it becomes easy for the monitoring center side to confirm the situation of the site to be monitored by the still image.

As described above, by first receiving the list image via the network and then receiving only the still image selected from the list image via the network, the individual still images constituting the list image are received. The time required for transmission / reception is shorter than the case where images are received one by one via the network.

Therefore, also in this respect, it becomes easy for the monitoring center side to confirm the situation of the site to be monitored by the still image.

Next, the applicant of the present invention includes a first remote monitoring device and a second remote monitoring device each having a communication interface for performing communication via a network, and the first remote monitoring device includes a plurality of remote monitoring devices. Video input terminals, input switching means for switching and selecting the video input to each one of these video input terminals, and stillness for obtaining a still image from the video selected by the input switching means. Image acquisition means, storage means for accumulating still images acquired by the still image acquisition means, and control for requesting transmission of images in which a plurality of still images are arranged in either a time series or a camera-based time series Based on receiving the data at the communication interface,
First control means for reducing a plurality of still images accumulated in the accumulating means to create a list image arranged in that manner, and transmitting the list image from a communication interface, and one still image in the list image. Second control means for reading the still image from the storage means and transmitting it from the communication interface on the basis of the control data requesting the transmission of the image being received by the communication interface. As a mode of arrangement of an output terminal and a plurality of still images, a first for specifying time series or time series by camera
Based on the operation means, the second operation means for instructing a list display of a plurality of still images, and the operation of the second operation means.
Control data requesting transmission of an image in which a plurality of still images are arranged in a manner designated by the first operation means is transmitted from the communication interface, and a list image received by the communication interface according to the control data is output as a video output terminal. Output from the first control means, third operation means for selecting one still image in the list image, and control for requesting transmission of the still image selected by operation of the third operation means. A remote monitoring system including a second control unit that transmits data from a communication interface and outputs a still image received by the communication interface according to the control data from a video output terminal is proposed.

By arranging the first and second remote monitoring devices at remote locations and monitoring centers respectively and connecting them to each other through a network, as described above, the situation of the on-site situation of the monitoring target by the still image is monitored on the monitoring center side. Confirmation becomes easier.

Next, the applicant has found that the first remote monitoring device and the second remote monitoring device each having a communication interface for communicating via the network are connected to this network, and the first remote monitoring device is connected to the network. The surveillance device has a plurality of video input terminals and one of these video input terminals.
Input switching means for switching and selecting the video input to each terminal, still image acquisition means for acquiring a still image from the video selected by the input switching means, and still image acquired by the still image acquisition means Storing means for storing the alarm signal, an alarm signal input terminal, a first control means for calling the second remote monitoring device via the network based on the input of the alarm signal to the alarm signal input terminal, and a plurality of stationary units. A plurality of images stored in the storage means based on the fact that the control data requesting the transmission of the images in which the images are arranged in the time series or the time series for each camera is received from the first remote monitoring device via the network. Second control means for reducing the size of the still image to create a list image arranged in that mode, and transmitting the list image to the second remote monitoring device via the network, and the list image. Based on the fact that the control data requesting the transmission of one of the still images is received from the first remote monitoring device via the network, the still image is read from the storage means and transmitted to the second remote monitoring device via the network. And a third control means for operating the second remote monitoring device,
A video output terminal, a first operation means for designating a time series or a time series for each camera as an arrangement mode of a plurality of still images, and a second operation means for instructing a list display of a plurality of still images. An image in which a plurality of still images are arranged in the manner designated by the first operating means based on the operation of the second operating means after the connection between the operating means and the first remote monitoring device via the network is established. Transmitting a control data requesting transmission of the data to the first remote monitoring device via the network, and outputting a list image received from the first remote monitoring device via the network according to the control data from the video output terminal. Control means, third operating means for selecting one still image in the list image, and control data requesting transmission of the still image selected by the operation of the third operating means via the network. First remote monitoring device Transmitted, we propose a remote monitoring system comprising a second control means for outputting a still image received from the first remote monitoring device via the network in response to the control data from the video output terminal.

By arranging the first and second remote monitoring devices at a remote location and a monitoring center, respectively, and connecting the sensors located at the site of the monitored object to the alarm signal input terminals, when the alarm signal is generated, As described above, it becomes easy for the monitoring center side to confirm the situation of the monitoring target site by still images.

In this remote monitoring system, as an example, the communication interface is TCP / IP and / or
Alternatively, UDP / IP is used as the communication protocol, and the first
RTP block that configures IP addresses on the remote monitoring device and the second remote monitoring device on the network and configures RTP (real-time data transfer protocol) packets from the list image and the still image on the first remote monitoring device And a port number that makes it possible to transfer a packet composed of control data in binary data format.
A TEL server that further includes a NET server, and uses a port number that enables transfer of a packet composed of control data in binary data format and an RTP block that restores video from an RTP packet to the second remote monitoring device.
And a NET client, the packet comprising the RTP block of the first remote monitoring device being transmitted from the first remote monitoring device to the second remote monitoring device,
Sent to the RTP block of the remote monitoring device of TELNE
The packet output from the T client is transmitted from the first remote monitoring device to the second remote monitoring device, and the TEL
It is preferable to be sent to the NET server.

As a result, one device, a first remote monitoring device and a second remote monitoring device, each having a single IP address, is installed on the remote site side and the monitoring center side, respectively. Simply by establishing a connection between the remote monitoring device and the second remote monitoring device, TCP / IP or UDP /
Both a list image and a still image can be transmitted from a remote location to the monitoring center and control data can be transmitted from the monitoring center to the remote location via a network using IP as a communication protocol.

That is, two devices, a device for transmitting / receiving a list image and a still image and a device for transmitting / receiving control data, are provided on the remote side and the monitoring center side, respectively,
There is no need to use two IP addresses for these two devices, and to make separate connections for transmitting / receiving list images and still images and transmitting / receiving control data.

Therefore, TCP / IP and UDP / IP
Via a network with a communication protocol of
Space-saving, low-cost and efficient transmission and reception of list images, still images and control data between monitoring centers will be possible.

Also, the TELNET server and the TELNET client using the normal port number 23 cannot transfer a packet composed of binary data format control data (composed of character code format control data). However, here, the port number that made it possible to transfer a packet composed of control data in binary data format is T.
It is used by ELNET server and TELNET client.

Therefore, the packet composed of the control data in the binary data format is transferred to TCP / IP or UDP.
/ IP can be transmitted from a monitoring center to a remote place via a network using a communication protocol.

Thus, for example, even when the second remote monitoring device (remote monitoring device of the monitoring center) has an input port for the control data in the binary data format, the data is input to the input port from the monitoring center side. The control data makes it possible to control the first remote monitoring device at a remote location (remote monitoring apparatus at a remote location) via a network using TCP / IP or UDP / IP as a communication protocol.

Further, for example, when the first remote monitoring device has an output port for control data in the binary data format for controlling the peripheral equipment, from the monitoring center side,
By using the control data input to the input port of the second remote monitoring device, it becomes possible to control peripheral devices at remote locations via a network having TCP / IP or UDP / IP as a communication protocol.

In this remote monitoring system, as an example, the communication interface is TCP / IP and / or
Alternatively, UDP / IP is used as the communication protocol, and the first
Of the second remote monitoring device, the second remote monitoring device further includes an RTP block that configures an RTP packet from the video, and the second remote monitoring device further includes an RTP block that restores the video from the RTP packet. When the connection is established, the RTP packet composed of the RTP block of the first remote monitoring device is transmitted from the video selected by the input switching means of the first remote monitoring device to the second packet from the first remote monitoring device. To the RTP block of the second remote monitoring device, and the first control means of the first remote monitoring device establishes a connection with the second remote monitoring device after establishing a connection with the second remote monitoring device. Based on the fact that the RTCP (Real Time Data Transfer Control Protocol) packet is not received from the second remote monitoring device for a certain time or longer, the connection with the second remote monitoring device is disconnected and the second remote monitoring device is restarted. The remote monitoring device is called and the RTCP packet indicating to the second remote monitoring device whether or not the RTP packet is sent to the first remote monitoring device is transmitted to the second remote monitoring device. It is preferable to further include third control means for disconnecting the connection with the first remote monitoring device on the basis that the RTP packet is not received for a predetermined time or longer.

During transmission of a list image or a still image from a remote location to the monitoring center via a network using TCP / IP or UDP / IP as a communication protocol, the network or the first remote monitoring device (remote monitoring of remote location) If a communication failure such as a connector dropout or power failure occurs in the device), the second remote monitoring device (remote monitoring device at the monitoring center) performs R
Since no TP packet is received, no RTP packet is sent to the RTP block of the second remote monitoring device.

When the state in which no RTP packet is sent to the RTP block of the second remote monitoring device continues for a certain period of time or more, the third control means of the second remote monitoring device causes
The connection between the first remote monitoring device and the second remote monitoring device is disconnected.

Further, the second remote monitoring device transmits the RTCP packet indicating whether or not the RTP packet is sent to the RTP block to the first remote monitoring device by the third control means. However, a communication failure occurs in the network or the second remote monitoring device, and as described above, the third control means of the second remote monitoring device causes the first remote monitoring device and the second remote monitoring device to communicate with each other. If the connection is disconnected, the RTCP packet will not be received by the first remote monitoring device.

When the RTCP packet is not received for a certain period of time or longer, the first control means of the first remote monitoring device establishes a connection between the first remote monitoring device and the second remote monitoring device. The second remote monitoring device is called again after being disconnected.

In this way, TCP / IP and UDP / IP
If a communication failure occurs in the network or the first and second remote monitoring devices during the transmission of list images and still images from a remote location to the monitoring center via a network with the communication protocol as the first remote monitoring device, And the connection with the second remote monitoring device are automatically disconnected, and the second remote monitoring device is automatically called again from the first remote monitoring device.

Therefore, when the communication failure is recovered, the connection between the first remote monitoring device and the second remote monitoring device is promptly reestablished, and the list image and the still image can be transmitted from the remote location to the monitoring center. It will be restarted.

That is, when a person in charge of maintenance or the like goes to the installation location of the first remote monitoring device or the second remote monitoring device to manually reconnect at the time of communication failure, a list image or a still image is displayed. Although it will take some time before the transmission of the list is resumed, the list image and the still image transmission will be restarted much faster than that case.

As described above, since the list image and the still image transmission to the monitoring center are resumed immediately after the communication failure is recovered, the monitoring center side also confirms the situation of the monitoring target site by the still image. Is easier to do.

[0058]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the drawings.

FIG. 1 shows an overview of a remote monitoring system to which the present invention is applied. In this remote monitoring system, a plurality of remote locations (company or factory of a certain company A) 61 and a plurality of monitoring centers (company in another area of the company A or company B of a security company B) 62 are connected by TCP / TCP. It is connected by a WAN (Wide Area Network) 63 using IP and UDP / IP as communication protocols.

FIG. 2 shows the system configuration of each remote location 61. In the guard room at the remote location 61, a remote monitoring device (transmitter) 1 connected to the WAN 63 and a monitor 2 are arranged.

In addition, a video camera 3 for monitoring, a microphone 4, and a sensor for crime prevention / disaster prevention (fire sensor, intrusion sensor, etc.) 5 are respectively provided at a plurality of monitoring sites such as entrances and exits of remote areas 61 and parking lots. It is arranged.

Further, the remote location 61 is provided with a peripheral device control device 6 for controlling panning, tilting, zooming and the like of the video camera 3, blinking operation of an illuminator, and opening / closing operation of a door.

FIG. 3 shows the system configuration of each monitoring center 62. In the monitoring center 62, a remote monitoring device (receiver) 11 connected to the WAN 63, a monitor 12,
A speaker 13 and a personal computer 14 are arranged.

FIG. 4 shows the configuration of the remote monitoring device 1 at each remote location 61. The remote monitoring device 1 is composed of a device body 1a and an operation device 1b connected to the device body 1a by a wire.

In the apparatus main body 1a, a plurality (for example, eight) of video input terminals Vi, a plurality of audio input terminals Ai, a video output terminal Vo, a parallel port P, and a serial port (RS-232C port) S. And a slot SL for a memory stick, which is a small memory card. The parallel port P has a plurality of terminals, and each terminal can be individually set as an input terminal or an output terminal.

Further, the input switching circuit 2 is provided in the apparatus main body 1a.
1, 22, A / D converters 23 and 24, a video compression circuit 25, an audio compression circuit 26, an RTP block 27,
Camera / still image control block 28 and still image acquisition circuit 2
9, a still image memory 30, and a still image display control block 3
1, TELNET server 32, control packet analysis block 33, communication control block 34, TCP / I
A communication interface 35 using P and UDP / IP as communication protocols, a D / A converter 36, and an interface 37 with the controller 1b are provided.

Video signals from the video cameras 3 shown in FIG. 2 are input to the video input terminals Vi of the remote monitoring device 1 and sent to the input switching circuit 21. Input switching circuit 21
Is 1 under the control of the camera / still image control block 28.
The video signal from each video camera 3 (video signal input to each video input terminal Vi) is switched and selected.

The video signal selected by the input switching circuit 21 is output from the video output terminal Vo and sent to the monitor 2 of FIG. 1, and is digitally converted by the A / D converter 23 to the still image acquisition circuit 29. Sent.

The still image acquisition circuit 29 includes an A / D converter 23.
The video signal sent from A is sent to the video compression circuit 25, and under the control of the camera / still image control block 28, A
The still image data is acquired from the video signal sent from the / D converter 23, and the still image data is sent to the still image memory 30 or the slot SL.

The still picture memory 30 has a storage memory 30a having a capacity of a predetermined number (for example, 80 pieces) of still picture data and a developing memory 30 for developing a list image.
b, and still image data sent from the still image acquisition circuit 29 continues to be stored in the storage memory 30a (after the still image data has been stored to the full capacity, a new still image is stored in the order of the region in which the still image data is stored first). Image data is overwritten and accumulated).

Audio signals from the microphones 4 in FIG. 2 are input to the audio input terminals Ai of the remote monitoring device 1 and sent to the input switching circuit 22. Input switching circuit 22
Then, under the control of the camera / still image control block 28,
Audio signals from the microphones 4 (microphones 4 at the same site as the video camera 3 currently selected by the input switching circuit 21) are switched and selected.

The audio signal selected by the input switching circuit 22 is digitally converted by the A / D converter 24 and then sent to the audio compression circuit 26.

Alarm signals generated from the respective sensors 5 in FIG.
It is sent to the still image control block 28 and the communication control block 34.

Although not shown, the operation device 1b is provided with operation keys and a joystick for performing the following operations (a) to (e) on the GUI screen.

(A) The order in which a plurality of video cameras 3 are switched and selected and the length of time during which the individual video cameras 3 are selected are the normal time (when the alarm signal from the sensor 5 is not generated). The setting is made separately when the alarm signal is generated, and as the setting when the alarm signal is generated, it is set individually depending on which sensor 5 at which site the alarm signal is generated.

(B) Operation for setting a time interval for acquiring still images and the number of still images acquired after the alarm signal from the sensor 5 is generated. (C) As a mode of arrangement of still images, a time series (a mode of arranging in order of shooting time regardless of which video camera 3 was used for shooting) or a time series for each camera (each video camera) Operation for designating a list of a plurality of still images on the monitor by designating whether or not each video camera 3 is arranged in order of time taken by the video camera 3.

(D) An operation for selecting and enlarging and displaying one still image among a plurality of still images displayed on the monitor. (E) An operation of storing a still image in the memory stick mounted in the slot SL.

From the operation unit 1b, the operation (a),
Control data in character code format based on (b) and (e) (hereinafter referred to as control data a, b, e) is sent via the interface 37 to the camera / still image control block 28.
Sent to. In addition, control data in character code format (hereinafter referred to as control data c, d) based on the operations (c) and (d) is sent from the operation device 1b to the still image display control block 31.

The camera / still image control block 28 receives this control data a (control data for individually setting the switching selection order and selection time length of the video camera 3 in the normal time and the time when the alarm signal is generated) and the sensor 5. The switching in the input switching circuits 21 and 22 is controlled based on whether or not the alarm signal is input.

In addition, the camera / still image control block 28
When the alarm signal is not sent from the sensor 5, the still image acquisition circuit 29 is based on the control data b (control data for setting the still image acquisition time interval and the number of still images acquired after the alarm signal is generated). On the other hand, control is performed so that a still image is acquired and continuously sent to the still image memory 30.

In addition, the camera / still image control block 28
When an alarm signal is sent from the sensor 5, stores the time when the alarm signal is sent, and the still image acquisition circuit 29 is provided with the marking data for identification in the still image data acquired immediately after that time. Control to add and control to stop acquisition of still image data at the time when the number of still image data set by the control data b is acquired after that time are performed.

In addition, the camera / still image control block 28
Based on the control data f (control data for accumulating a still image on a memory stick), the still image acquisition circuit 29 sends the acquired still image data to the still image memory 30 as well as the slot SL. I do.

The video compression circuit 25 uses H.264 as a video coding system. 261 and H.261. H.263 is supported, the video signal sent from the still image acquisition circuit 29 is compressed, and the compressed video data is sent to the RTP block 27.

The voice compression circuit 26 uses the G.264 standard as a voice encoding system. 722, G.I. 728 and G.I. 723.1 is supported, the audio signal sent from the A / D converter 24 is compressed, and the compressed audio data is sent to the RTP block 27.

The RTP block 27 uses the video data,
From the audio data, H.264. Video data defined in H.323,
A packet of RTP (Real Time Data Transfer Protocol), which is a protocol for voice data transmission, is configured and the packet is sent to the communication interface 35.

The TELNET server 32 uses TCP / I
TELN which is a protocol for remote login in P
It is a server using the ET protocol. TELNE
The T server 32 has a unique port number of 499 instead of the normal TELNET port number of 23.
By using No. 99, a packet composed of binary data can be transferred.

The communication interface 35 is the WA of FIG.
It is connected to N63, and the IP address is set on WAN63.

From the communication interface 35 to TELNE
The packet sent to the T server 32 is sent to the control packet analysis block 33.

The control packet analysis block 33 analyzes this packet and restores the control data. Then, of the restored control data, control data (control data A and B described later) regarding display of a still image is sent to the still image display control block 31. Also, among the restored control data, control data relating to peripheral devices (control data relating to panning, tilting, zooming, etc. of the video camera 3, blinking operation of the illuminator, and opening / closing operation of the door) is transferred to the serial port S,
Output from the parallel port P respectively.

The control data output from the serial port S is sent to the peripheral device control device 6 of FIG.

The still image display control block 31 requests the control packet analysis block 33 to transmit control data A (to be described later) a list image in which a plurality of still images are arranged in either a time series or a time series for each camera. Control data) to be transmitted, all the still image data are read from the storage memory 30a of the still image memory 30. Then, thumbnails obtained by reducing the respective still image data are expanded in the expansion memory 30b of the still image memory 30 in the designated arrangement mode, and the still images are displayed as a list over one page or a plurality of pages. Create list image data.

Then, the list image data is read from the expansion memory 30b and sent to the video compression circuit 25.
After that, when the control packet analysis block 33 sends control data B (control data requesting enlargement and transmission of one still image in the list image), which will be described later, the data of the one still image is stopped. It is read from the storage memory 30a of the image memory 30 and sent to the video compression circuit 25.

On the other hand, the still image display control block 31 receives the control data c (control data for displaying a list of still images by designating one of the time series and the time series for each camera) from the operation unit 1b. When sent, the storage memory 30a
Read all still image data from. Then, thumbnails obtained by reducing the respective still image data are expanded in the expansion memory 30b in the specified arrangement mode, and the data of the list image for displaying a list of the still images over one page or a plurality of pages is displayed. Let me create.

Then, the list image data is read from the expansion memory 30b and sent to the D / A converter 36.
After that, when the above-mentioned control data d (control data for enlarging and displaying one still image in the list image) is sent from the operation unit 1b, one still image data is stored in the storage memory 30a.
It is read from and sent to the D / A converter 36.

The data of the list image and the still image which are analog-converted by the D / A converter 36 are output from the video output terminal Vo and sent to the monitor 2 of FIG.

In the communication control block 34, a connection destination list when an alarm signal from the sensor 5 is generated is registered. The list of connection destinations includes the type of the sensor 5 that has generated the alarm signal and the remote monitoring device 11 (FIG. 3) of any one of the plurality of monitoring centers 62.
IP address (I of the communication interface 41 described later)
(P address).

When an alarm signal is sent from the sensor 5, the communication control block 34 controls the communication interface 35 based on this connection destination list to control the remote monitoring device 11.
After establishing the connection with the remote monitoring device 11, a communication failure countermeasure process as shown in FIG. 16 described later is performed.

FIG. 5 shows the configuration of the remote monitoring device (receiver) 11 of each monitoring center 62. The remote monitoring device 11 is
The device main body 11a and the operation device 11b connected to the device main body 11a by a wire are included.

The apparatus main body 11a has a video output terminal Vo.
, An audio output terminal Ao, a parallel port P, and a serial port (RS-232C port) S are provided.

Further, the device main body 11a is provided with TCP / IP.
And a communication interface 41 using UDP / IP as a communication protocol, an RTP block 42, a video expansion circuit 43, an audio expansion circuit 44, and D / A converters 45 and 46.
A control packet configuration block 47, a TELNET client 48, a communication control block 49, and a controller 1.
An interface 50 with 1b is provided.

To the RTP block 42, RTP packets among the packets received by the communication interface 41 are sent. The RTP block 42 analyzes the packet to restore the video data and audio data, and sends the video data and audio data to the video expansion circuit 43 and the audio expansion circuit 44, respectively.

The TELNET client 48 uses the TEL
It is a client that uses the NET protocol, and by using the unique port number 49999 as well as the TELNET server 32 of the remote monitoring device 1 at the remote location 61, it is possible to transfer a packet composed of binary data. There is.

The communication interface 41 is the WA of FIG.
It is connected to N63, and the IP address is set on WAN63.

The video decompression circuit 43 uses H.264 as a video coding method. 261 and H.261. 263 support, RT
The video data sent from the P block 42 is expanded, and the expanded video signal is sent to the D / A converter 45. The video signal analog-converted by the D / A converter 45 has a video output terminal V
It is output from o and sent to the monitor 12 in FIG.

The voice compression circuit 44 uses G.264 as a voice encoding method. 722, G.I. 728 and G.I. 723.1 is supported, the audio data sent from the RTP block 42 is expanded, and the expanded audio signal is sent to the D / A converter 46. The audio signal analog-converted by the D / A converter 46 is output from the audio output terminal Ao and output to the speaker 13 of FIG.
Sent to.

Although not shown, the operation unit 11b is provided with operation keys and the like for performing the following operations (A) and (B) as operations for displaying a still image.

(A) Operation for designating a time series or a time series for each camera as a still image arrangement mode, and transmitting a list image in which a plurality of still images are arranged in that mode from a remote location 61 and displaying it on a monitor . (B) An operation of selecting one still image in the list image, enlarging and transmitting the still image from the remote location 61, and displaying it on the monitor.

Further, the operation device 11b has operation keys and the like for causing the video camera 3 (FIG. 2) at the remote place 61 to perform operations such as pan, tilt, and zoom, and blinking operation of the illuminator at the remote place 61. Operation keys and the like for opening and closing the door are also provided.

Control data in character code format based on these operations (of which control data A and B based on operations (A) and (B)) is sent from the operation unit 11b through the interface 50. Sent to the control packet construction block 47 via.

The personal computer 14 shown in FIG.
Serially communicates with the remote monitoring device 11. From the personal computer 14, the control data in the binary data format by this serial communication is input to the serial port S and sent to the control packet construction block 47.

The control packet construction block 47 creates a control packet which is a packet of the TELNET protocol from the control data sent from the operation unit 11b or the personal computer 14. Then, the control packet is sent to the TELNET client 48.

FIG. 6 shows the structure of a control packet formed by the control packet structure block 47. The control packet is composed of a header part, a control data part (control data sent from the controller 11b or the personal computer 14) and a terminal symbol. The header part includes a start symbol and a control data part (a header part and a terminal symbol). Data indicating the type of control data in the control data section) and a data table.

The communication control block 49 performs processing for establishing a connection with the remote monitoring device 1 in response to a call from the remote monitoring device 1 at the remote location 61, and after the connection is established, the communication control block 49 shown in FIG. Such communication failure countermeasure processing is performed.

FIG. 7 and FIG. 8 are flow charts showing, of the processes executed by the remote monitoring device 1 at the remote location 61 and the remote monitoring device 11 at the monitoring center 62, the processing relating to the still image display on the monitoring center 62 side. Is.

In the remote monitoring device 1 at the remote location 61, as shown in FIG. 7, first, the camera / still image control block 28
And the communication control block 34 determines whether or not an alarm signal is sent from any of the sensors 5 (step S
1).

[0116] If NO, the camera / still image control block 28 determines the control data a from the operation device 1b (switching selection order and selection time length of the video camera 3 separately in the normal time and the alarm signal generation time). The switching in the input switching circuits 21 and 22 is controlled according to the normal selection order and time interval set by the control data to be set (step S2).

Then, the camera / still image control block 28
However, the still image is acquired based on the time interval set by the control data b (control data for setting the still image acquisition time interval and the number of still images acquired after the alarm signal is generated) from the operation unit 1b. By controlling the still image acquisition circuit 29 to keep sending to the memory 30, the still image is stored in the storage memory 30a of the still image memory 30 (step S3). Then, the process returns to step S1.

When the answer in step S1 is YES, the communication control block 34 calls the remote monitoring device 11 of one monitoring center 62 via the communication interface 35 based on the connection destination list (step S4).

Further, the camera / still image control block 28
Is generated when an alarm signal is set by the control data a (control data for individually setting the switching selection order and the selection time length of the video camera 3 in the normal time and when the alarm signal is generated) from the controller 1b. The switching in the input switching circuits 21 and 22 is controlled according to the selection order and the time interval, and in addition to the same control as the step S3, the still image acquisition circuit 29 is changed to the still image acquired immediately after the alarm signal is generated. Control is performed to add a marking for identification (step S
5).

As a result, the RT of the video and audio sent from the RTP block 27 to the communication interface 35.
P packets (video and audio RTP packets that are switched and selected according to the selection order and time interval when the alarm signal is generated) are transmitted to the remote monitoring device 11 of the connection destination via the WAN 63.

Then, the still image display control block 31
It is determined whether or not control data A (control data requesting transmission of a list image in which a plurality of still images are arranged in a time series or a time series for each camera) is sent from the control packet analysis block 33. (Step S6).

If yes, the still image display control block 31 causes the still image memory 30 to create a list image as described above and sends it to the video compression circuit 25 (step S).
7).

As a result, the list image is compressed by the video compression circuit 25, the RTP packet of the list image is formed by the RTP block 27, and the communication interface 35 is formed.
RTP packet of this list image is sent to WA
It is transmitted to the remote monitoring device 11 of the connection destination via N63.

Then, the still image display control block 31
It is determined whether or not control data B (control data requesting to enlarge and transmit one still image in the list image) is transmitted from the control packet analysis block 33 (step S8).

If yes, the still image display control block 31 reads the still image from the storage memory 30a of the still image memory 30 and sends it to the video compression circuit 25 (step S9). As a result, the video compression circuit 25 compresses this still image, and the RTP block 27 RTP this still image.
Since a packet is formed and sent to the communication interface 35, this still image RTP packet is sent to the remote monitoring device 11 of the connection destination via the WAN 63.

Subsequently, the camera / still image control block 28
However, after the alarm signal is generated, the still image acquisition circuit 29 acquires the number of still images set by the control data b (control data for setting the still image acquisition time interval and the number of still images acquired after the alarm signal is generated). It is determined whether it has been done (step S10). Even if the result of step S6 or step S8 is NO, the process proceeds to step S10.

If no, the process returns to step S6. On the other hand, if yes, the camera / still image control block 28
The still image acquisition circuit 29 is controlled to stop the acquisition of the still image (step S11). And step S6
Return to.

In the remote monitoring device 11 of the monitoring center 62, after the connection with the remote monitoring device 1 in the remote place 61 is established, the RTP packet and the audio of the video which are switched and selected according to the selection order and the time interval when the alarm signal is generated. Since the RTP packet of 1 is received from the remote monitoring device 1 via the WAN 63, the video is displayed on the monitor 12 and the sound is generated from the speaker 13.

After the connection is established, in the remote monitoring device 11, as shown in FIG. 8, the control data A (a plurality of still images are time-series or camera-based time-series) is input from the operation unit 11b or the personal computer 14. Control data for requesting transmission of a list image arranged in any one of the above modes is sent to the control packet configuration block 47, that is, by specifying an array mode of time series or camera-specific time series. Operation to display a list of still images (Operation (A) above)
Whether or not the operation is performed by the operation device 11b or the personal computer 14 is repeatedly determined (step S2).
1).

When the answer is yes, the control packet composed of the control packet construction block 47 from the control data A is sent to the communication interface 41, and the WA
It is transmitted to the remote monitoring device 1 via N63 (step S
22).

As a result, the RTP packet of the list image is received via the WAN 63 by the processing of steps S6 and S7 of the remote monitoring apparatus 1 in FIG. 7, and the list image is displayed on the monitor 12.

Subsequently, it is displayed whether or not the above-mentioned control data B (control data for requesting to enlarge and transmit one still image in the list image) has been sent to the control packet construction block 47, that is, a list display. It is determined whether or not the operation of selecting and enlarging and displaying one still image among the plurality of still images (the above-described operation (B)) has been performed (step S2).
3).

If NO, the process returns to step S21. On the other hand, if yes, the control packet composed of the control packet construction block 47 from the control data B is sent to the communication interface 41 and is sent to the remote monitoring device 1 via the WAN 63 (step S24). Return to S21.

As a result, the RT of one still image is processed by the processing of steps S8 and S9 in FIG. 7 of the remote monitoring apparatus 1.
Since the P packet is received via WAN 63, the still image is displayed on the monitor 12.

9 and 10 show the monitoring center 62 when an alarm signal is generated by the processing relating to the still image display.
3 illustrates an example of a list image displayed on the monitor 12 of FIG.

Of these, FIG. 9 is an example when the time series for each camera is designated as the arrangement mode of the still images. A thumbnail of a plurality of still images is displayed as a list in the display area 102 of the list image with the image 101 that is switched and selected according to the selection order and the time interval when the alarm signal is generated as the background.

The display area 102 is capable of displaying a total of 40 thumbnails of 8 horizontal × 5 vertical (8 is the number of video input terminals Vi of the remote monitoring device 1 at the remote location 61) at one time.

When the time series for each camera is designated, one vertical column area is assigned to each of the eight video cameras, and CAM # 1 is assigned to the upper side of each vertical column (display area of the background image 101). The characters CAM # 2 ... CAM # 8 are displayed.

Then, a total of five video cameras 3 (3-1 to 3−3) installed at the entrance / exit of the remote place 61, a parking lot, or the like.
In 5), thumbnails SN1 of a plurality of still images acquired from the video image captured by the video camera 3-1 are arranged in the leftmost column of the display area 102 in the order of the captured time from top to bottom. Is displayed. (In the figure, for convenience of illustration, the symbol SN1 is drawn in place of the thumbnail itself at the position where the thumbnail is displayed.)

Further, the thumbnails SN2 of a plurality of still images acquired from the video image captured by the video camera 3-2 are
Thumbnail SN3 of a plurality of still images arranged in the second column from the left end of the display area 102 in the order of shooting time from top to bottom and obtained from the video captured by the video camera 3-3.
Are arranged in the third column from the left end of the display area 102 in the order of shooting time from top to bottom, and a thumbnail SN4 of a still image acquired from the video captured by the video camera 3-4 is displayed.
Are arranged in the fourth column from the left end of the display area 102 in the order of shooting time from top to bottom, and thumbnails S of a plurality of still images acquired from the video captured by the video camera 3-5 are displayed.
N5 are arranged in the fifth column from the left end in the order of shooting time from top to bottom.

The number of still image thumbnails of the video cameras 3-1, 3-2 and 3-4 is the same as that of the video camera 3-.
It is larger than the number of still image thumbnails for 3 and 3-5. This is a remote monitoring device 1 at a remote location 61.
In the setting operation (the above-mentioned operation (a)) of switching selection order and selection time length of the video camera 3 using the operation device 1b, the alarm signal is set at the same site as the sensor 5 that generated the alarm signal. The operation giving priority to the video camera 3 is performed, and the video cameras 3-1, 3-2, 3
-4 was at the same site as the sensor 5 that generated the alarm signal.

Of the thumbnails SN1 to SN5, thumbnails of still images acquired immediately after the alarm signal from the sensor 5 is generated (here, the fifth thumbnail SN from the top).
1) is surrounded by a frame (frame based on marking data added by the still image acquisition circuit 29) 103 indicating that the image is a still image immediately after the alarm signal is generated.

In the display area 102, the operation device 11
A cursor 104 for selecting one still image in the list image on the personal computer 14 or the personal computer 14 is also displayed.

Although 80 still image data are stored in the still image memory 30, only 40 thumbnails at the maximum can be displayed at one time in the display area 102 (1 in the case of time series by camera). Only 5 images are displayed for each video camera 3). Therefore, on the lower side of the display area 102 (the display area of the background image 101), the "previous page",
The characters "next page" and "return" are displayed, and the characters are displayed by operating the operation device 11b or the personal computer 14 to select the display position of the character.
The thumbnail of the still image is switched to the display area 102 and displayed.

On the other hand, FIG. 10 shows an example in which a time series is designated as the arrangement mode of still images, and the portions common to FIG. 9 are assigned the same reference numerals.

In this example, regardless of which video camera 3 the thumbnails SN1 to SN5 of a plurality of still images respectively acquired from the images taken by the five video cameras 3 are taken, Arranged in the order of the times taken, from left to right in the top row of the display area 102, then from left to right in the second row from the top, ... Finally, from left to right in the bottom row. Will be displayed.

FIG. 11 shows a display example of the monitor 12 when a thumbnail of one still image in the list image displayed as shown in FIG. 9 or 10 is selected. The still image 111 in which the selected thumbnail is enlarged and displayed (read from the storage memory 30a of the still image memory 30 of the remote monitoring device 1 at the remote location 61) is displayed on the full screen.

Here, the processing relating to the still image display at the monitoring center 62 and an example of the display are shown, but the monitor 2 in the guard room at the remote location 61 also has an operating device 1b of the remote monitoring device 1 when an alarm signal is generated. By operating
~ List images and still images are displayed in exactly the same manner as shown in Fig. 11.

The monitor 2 in the guard room at the remote location 61
In the normal state (when an alarm signal is not generated), a list image or a still image is displayed by operating the operation device 1b of the remote monitoring device 1.

FIG. 12 and FIG. 13 exemplify a list image displayed on the monitor 2 at the normal time (a list image when a time series for each camera and a time series are designated as the arrangement mode of still images). The same parts as those in FIG. 9 are designated by the same reference numerals.

In this example, the remote monitoring device 1 at the remote location 61 is used.
In the setting operation of the switching selection order and the selection time length of the video cameras 3 using the operation device 1b (operation (a) described above), the operation of uniformly selecting all the video cameras 3 is performed as the normal setting. ing.

According to this remote monitoring system, as illustrated in FIGS. 9 and 10, when an alarm signal is generated from the sensor 5 at the remote location 61, the monitoring center 62 side continues for a time before and after the alarm signal is generated. A list image in which thumbnails of a plurality of still images acquired from images captured by a plurality of video cameras 3 at a remote location 61 are arranged in a desired manner in a time series or a time series by camera is displayed on a monitor. 12 can be displayed.

In the case of the time series for each camera, these thumbnails are displayed on the monitor 12 for each video camera 3 in a list in the order of the time taken by the video camera 3.

As described above, the thumbnails of a plurality of still images are arranged in a time series for each camera and displayed as a list, which makes it easy to understand which still image was captured by which video camera 3. .

Then, when a still image taken by the video camera 3 at the site to be confirmed is selected from the list image, the still image is displayed on the monitor 12 in full screen.

As a result, when the alarm signal is generated, the monitoring center 62 side can easily confirm the situation of the monitoring target site by the still image.

Further, since the list image is first received via the WAN 63, and only the still images selected from the list image are then received via the WAN 63, the individual still images constituting the list image are individually received one by one. The time required for transmission / reception is shorter than that for reception via WAN 63.

Therefore, also from this point, it is easy to confirm the situation of the monitoring target site by the still image on the monitoring center 62 side when the alarm signal is generated.

Further, according to this remote monitoring system, even in the guard room at the remote location 61, when the alarm signal is generated, the list image and the still image selected from the list image are monitored in the same manner as the monitoring center 62 side. 12 can be displayed.

As a result, even when the alarm signal is generated, it is easy to confirm the situation of the monitored site by the still image even in the guard room at the remote location 61.

Furthermore, in the guard room at the remote location 61, as shown in FIG.
2. As illustrated in FIG. 13, the list image and the still image selected from the list image can be displayed on the monitor 12 also in the normal time (when the alarm signal is not generated).

As a result, in the guard room at the remote location 61,
Even in normal times, it is easy to check the situation of the monitored site using still images.

The above-mentioned operation (b) on the operation unit 1b of the remote monitoring apparatus 1 at the remote location 61 (time interval for acquiring still images and the number of still images acquired after the alarm signal from the sensor 5 is generated). If the number of still images to be acquired after the alarm signal is generated is set to a small number in the operation of setting and, the number of still images acquired in the still image acquisition block 29 after the alarm signal is generated and stored in the still image memory 30 is set. The number of sheets decreases. Therefore, when the alarm signal is generated, the monitor 1
2 and the list image displayed on the monitor 2 have a large ratio of the number of thumbnails of still images acquired before the alarm signal is generated. As a result, it becomes possible to intensively check the situation at the site before the alarm signal is generated.

On the contrary, if the number of still images to be acquired after the alarm signal is generated is set to a large value by this operation, the still images acquired in the still image acquisition block 29 and accumulated in the still image memory 30 after the alarm signal is generated. The number of pictures increases. Therefore, in the list image displayed on the monitor 12 or the monitor 2 when the alarm signal is generated, the ratio of the number of thumbnails of still images acquired after the alarm signal is generated is large. As a result, it becomes possible to focus on the situation of the site after the alarm signal is generated.

As described above, it is possible to arbitrarily select which of the situation before the alarm signal is generated and the situation after the alarm signal is mainly confirmed.

Next, FIG. 14 and FIG. 15 show the connection between the remote monitoring device 1 and the remote monitoring device 11 among the processes executed by the remote monitoring device 1 at the remote location 61 and the remote monitoring device 11 at the monitoring center 62. 6 is a flowchart showing processing relating to transmission / reception of video, audio, list image, still image and control data after establishment.

In the remote monitoring device 1 at the remote location 61, the remote monitoring device 1 shown in FIG.
As shown in, the video signal and the audio signal switched and selected by the input switching circuits 21 and 22 are compressed by the video compression circuit 25 and the audio compression circuit 26 (step S31), and the compressed video data by the RTP block 27, Video and audio RTP packets are constructed from audio data (step S3).
2).

Then, the video and audio RTP packets are transferred from the RTP block 27 to the communication interface 35.
And is transmitted from the communication interface 35 to the RTP block 42 of the remote monitoring device 11 of the connection destination via the WAN 63 (step S33).

If the control packet addressed to the TELNET server 32 is not received by the communication interface 35,
These steps S31 to S33 are repeated (step S34).

On the other hand, when the control packet addressed to the TELNET server 32 is received, the control packet is sent from the communication interface 35 to the control packet analysis block 33 via the TELNET server 32, and the control packet analysis block 33 transmits the control packet. The control data is analyzed and restored (step S35).

When the control data is the above-mentioned control data A and B, the control data A and B are sent to the still image display control block 31. On the other hand, if the control data is video camera control data or peripheral device control data, the control data is serial port S.
And is sent to the peripheral device control device 6 (FIG. 2) (step S36). Then, the process returns to step S31.

After the control data A and B are sent to the still image display control block 31 in step S36, the list image and still image data are sent from the still image memory 30 to the video compression circuit 25 as described above. , R for list images and still images
The TP packet is also transmitted to the RTP block 42 of the remote monitoring apparatus 11 of the connection destination.

In the remote monitoring device 11 of the monitoring center 62, as shown in FIG. 15, the video and audio RTP packets addressed to the RTP block 42 transmitted from the remote monitoring device 1 are received by the communication interface 41 (step S41).

This RTP packet is sent from the communication interface 41 to the RTP block 42, and this RTP packet is analyzed by the RTP block 42 to obtain video data,
The voice data is restored (step S42.).

Then, the video data and audio data are
It is sent from the RTP block 42 to the video expansion circuit 43 and the audio expansion circuit 44, respectively, and expanded by the video expansion circuit 43 and the audio expansion circuit 44 (step S43).

If no control data is sent to the control packet construction block 47 (that is, unless the operation device 11b or the personal computer 14 displays a list image or a still image or operates the video camera 3 or a peripheral device). ), And steps S41 to S43 are repeated (step S44).

On the other hand, when the control data is sent to the control packet construction block 47, the control packet construction block 47 is sent.
Then, a control packet is constructed from this control data. (Step S45).

This control packet is sent from the control packet construction block 47 to the TELNET client 48.
To the TELNET server 32 of the remote monitoring apparatus 1 at the remote location 61 via the WAN 63 from the communication interface 41 (step S46). Then, the process returns to step S41.

As shown in FIGS. 14 and 15, according to this remote monitoring system, the remote monitoring device 1 and the remote monitoring device 1 each having a single IP address on the remote site 61 side and the remote monitoring center 62 side respectively. One device called a monitoring device 11 is installed, and the remote monitoring device 1 and the remote monitoring device 1 are installed.
TCP / IP and UDP only by establishing a connection with 1.
/ WAN is used as a communication protocol to send video, audio, list images and still images from the remote location 61 to the monitoring center 62, and from the remote location 61 to the monitoring center 62.
It is possible to both send and receive control data to.

That is, two devices, a device for transmitting / receiving video, audio, list images and still images, and a device for transmitting / receiving control data, are provided on the remote side 61 side and the monitoring center 62 side, respectively. It is no longer necessary to use two IP addresses for these two devices, and to make separate connections for sending and receiving video, audio, list images and still images and for sending and receiving control data.

Therefore, TCP / IP and UDP / I
Remote location 6 via WAN 63 with P as the communication protocol
1. It is possible to efficiently transmit and receive video, audio, list image, still image list and control data between the monitoring center 62, space saving, low cost and efficiently.

Further, the TELNET server and the TELNET client using the normal port number 23 cannot transfer the packet composed of the control data in the binary data format (composed of the control data in the character code format). Only the packet can be transferred), but here, the port number 49999 which is the port number that enables the transfer of the packet composed of the control data in the binary data format is the TELNET server 32, TE.
Used by LNET client 48.

Therefore, a control packet composed of control data in binary data format can be transmitted from the monitoring center 62 to the remote location 61 via the WAN 63 having TCP / IP and UDP / IP as communication protocols.

Accordingly, the WAN 6 is controlled by the control data input from the personal computer 14 to the serial port S of the remote monitoring device 11 from the monitoring center 62 side.
The remote monitoring device 1 at the remote location 61 can be controlled via 3 to transmit a list image or a still image.

Furthermore, according to the control data input to the serial port S from the monitoring center 62 side, the WA
Peripheral device control device 6 at remote location 61 via N63 (Fig. 2)
To control panning, tilting, zooming, etc. of the video camera 3, blinking of the illuminator, and opening / closing of the door (as if the personal computer 14 of the monitoring center 62 directly connected to the peripheral device 61 of the remote location 61 by serial cable These operations can be performed as if they were connected to the control device 6).

Next, FIG. 16 and FIG. 17 show the communication control block 34 and the monitoring center 6 of the remote monitoring device 1 at the remote location 61.
6 is a flowchart showing a communication failure countermeasure process executed by a communication control block 49 of the remote monitoring device 11 of FIG.

Communication control block 34 of remote monitoring device 1
As shown in FIG. 16, after a predetermined initialization process (step S51), stands by until an alarm signal is sent from the sensor 5 (step S52).

When an alarm signal is sent, Q. The remote monitoring device 11 of the monitoring center 62 is called by the protocol (IP connection protocol) defined by 931 to establish a connection with the remote monitoring device 11. When the connection is established, H.264. Negotiation is performed by the protocol (general-purpose multimedia communication control program) defined by H.245 (step S53).

As a result, the RT of the video and audio sent from the RTP block 27 to the communication interface 35.
P packets (video and audio RTP packets that are switched and selected according to the selection order and time interval when the alarm signal is generated) are transmitted to the remote monitoring device 11 of the connection destination via the WAN 63.

Then, from the remote monitoring device 11 of the connection destination, R
It is repeatedly judged whether or not a TCP (Real Time Data Transfer Control Protocol) packet is received (step S54).

If YES, it is determined whether or not the state in which the RTCP packet is not received continues for a certain time (for example, several seconds to several tens seconds) (step S5).
5).

If NO, the process returns to step S54. On the other hand, if yes, Q. The connection with the remote monitoring device 11 is disconnected by the protocol defined in 931 (step S
56), and after initialization processing (step S57), Q. 93
The remote monitoring device 11 again according to the protocol defined in 1.
To establish a connection with the remote monitoring device 11. When the connection is established, H.264. Negotiation is performed by the protocol defined by H.245 (step S5).
8). Then, the process returns to step S54.

Communication control block 49 of remote monitoring apparatus 11
As shown in FIG. 17, after a predetermined initialization process (step S61), waits until there is a call from the remote monitoring device 1 (step S62).

When there is a call, Q. An IP connection with the remote monitoring device 1 is established by the protocol defined in 931. When the connection is established, H.264. Negotiation is performed by the protocol defined by H.245 (step S6).
3). As a result, the image received from the remote monitoring device 1,
The voice RTP packet is sent to the RTP block 42.

Then, it is judged whether or not an RTP packet is sent to the RTP block 42 (step S6).
4). If the answer is yes, the "RTP present" flag is set (step S65), and if the answer is no, "no RTP" is set.
The flag is set (step S66).

Then, based on the currently set flag, H.264 is set as a packet indicating whether or not an RTP packet is sent to the RTP block 42. RTCP (real-time data transfer control protocol), which is a protocol defined in H.323, is configured and its RTC
P packet from communication interface 41 to WAN 63
It transmits to the remote monitoring apparatus 1 via (step S67).

Subsequently, it is determined whether the "no RTP" flag is continuously set for a certain time or more (that is, whether the state in which the RTP packet is not sent to the RTP block 42 is more than the certain time) (step S68). .

If no, the process returns to step S64. On the other hand, if yes, Q. The connection with the remote monitoring device 1 is disconnected by the protocol defined in 931 (step S6).
9) and returns to step S61.

During transmission of video, audio, list image, and still image from the remote location 61 to the monitoring center 62 via the WAN 63 using TCP / IP and UDP / IP as communication protocols, the WAN 63 and the remote monitoring device 1 are When a communication failure such as a dropout of a connector or a power failure occurs, the RTP packet is no longer received by the remote monitoring device 11, so that the RTP packet cannot be sent to the RTP block 42 of the remote monitoring device 11.

When the state in which no RTP packet is sent to the RTP block 42 continues for a certain period of time or more, the communication control block 49 of the remote monitoring apparatus 11 executes the processing of steps S68 to S69 in FIG. The connection with the monitoring device 11 is disconnected.

Also, from the remote monitoring device 11, the RTCP packet indicating whether or not the RTP packet is sent to the RTP block 42 is transmitted to the remote monitoring device 1 by the processing of step S67 of FIG. 17 by the communication control block 49. To be done. However, a communication failure occurs in the WAN 63 or the remote monitoring device 11, or as described above, the remote monitoring device 11
When the connection between the remote monitoring device 1 and the remote monitoring device 11 is disconnected by the communication control block 49 of 1, the remote monitoring device 1 does not receive this RTCP packet.

When the state in which the RTCP packet is not received continues for a certain time or longer, the communication control block 34 of the remote monitoring apparatus 1 executes steps S55 to S5 in FIG.
By the processing of 8, the remote monitoring device 1 and the remote monitoring device 11
The connection with is disconnected and the remote monitoring device 11 is called again.

As described above, TCP / IP and UDP / I
Remote location 6 via WAN 63 with P as the communication protocol
If a communication failure occurs in WAN 63 or remote monitoring device 1 or 11 while transmitting video, audio, list image, or still image from 1 to monitoring center 62, the connection between remote monitoring device 1 and remote monitoring device 11 is automatically established. The remote monitoring device 1 is automatically called by the remote monitoring device 1.

Therefore, when the communication failure is recovered, the connection between the remote monitoring device 1 and the remote monitoring device 11 is immediately reestablished, and the video, audio, list image, and still image from the remote location 61 to the monitoring center 62 are displayed. Transmission is resumed.

That is, when a person in charge of maintenance or the like goes to the installation location of the remote monitoring device 1 or the remote monitoring device 11 and manually reconnects in the event of a communication failure, video, audio, list images, still images are displayed. Will take some time to resume, but the transmission of video, audio, list image, and still image will be resumed much faster than that.

In this way, the transmission of video, audio, list image, and still image to the monitoring center 62 is resumed immediately after the recovery of the communication failure.
It is easier for the user to check the situation of the monitored site by video, audio or still images.

In the above example, as shown in FIGS. 9 and 10, a maximum of 40 thumbnails are displayed at once as a list image.

However, as another example, the still picture memory 30
You may make it display the thumbnail of 80 still images accumulate | stored in 1 as a list image at once.

In the above example, the remote monitoring devices 1, 1
The device main bodies 1a and 11a of FIG.
1b is wired.

However, as another example, the operating devices 1b, 11
Instead of b (or in addition to the operation devices 1b and 11b), the device main bodies 1a and 11a of the remote monitoring devices 1 and 11 may be provided with operation panels for performing the same operations as the operation devices 1b and 11b, respectively.

Further, in the above example, on the monitoring center 62 side, the control data in the binary data format by serial communication is sent from the personal computer 14 to the remote monitoring device 11.
Of the peripheral device and the control data of the peripheral device restored by the control packet analysis block 33 of the remote monitoring device 1 is controlled from the serial port S to the peripheral device. Sending to device 6.

However, as another example, the monitoring center 62
On the side, the remote monitoring device 1 transmits control data in binary data format by parallel communication from the personal computer 14.
1 is sent to the parallel packet P to the control packet configuration block 47, and at the remote location 61, the control data relating to the peripheral device restored by the control packet analysis block 33 of the remote monitoring device 1 is transmitted from the parallel port P to the peripheral device. It may be sent to the control device 6.

Even in such a case, the control data input from the monitoring center 62 to the parallel port controls the peripheral device control device 6 at the remote location 61 to perform panning, tilting, zooming and other operations of the video camera 3 and lighting. It is possible to perform the blinking operation of the container and the opening / closing operation of the door.

Further, in the above example, the remote monitoring device 1 installed in the remote place 1 and the remote monitoring device 11 installed in the monitoring center 62 are different from each other in configuration.

However, as another example, the remote monitoring devices having the functions of both the remote monitoring device 1 and the remote monitoring device 11 may be installed in the remote location 61 and the monitoring center 62, respectively.

As a result, it becomes possible to transmit video, audio, list images, and still images not only from the remote location 61 to the monitoring center 62 but also from the monitoring center 62 to the remote location 61. It becomes possible to remotely monitor the site of the other facility between the multiple facilities of the other.

Further, the present invention is not limited to the above examples, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0218]

As described above, according to the present invention, in a guard room or a surveillance center in a remote place, a plurality of images obtained from images taken by a plurality of video cameras arranged at a site to be monitored are provided. It is possible to display on the monitor a list image in which the still images are reduced and arranged in time series by camera (for each video camera, arranged in order of the time taken by the video camera).

As described above, a plurality of still images are arranged in time series for each camera and displayed as a list, which makes it easy to understand which still image was taken by which video camera.

Then, when a still image taken by a video camera at the site to be confirmed is selected from the list image, the selected still image is enlarged and displayed on the monitor.

As a result, it is possible to obtain an effect that it becomes easy to confirm the situation of the monitoring target site by the still image in the guard room or the monitoring center side in the remote place.

Since this list image is transmitted from the remote place to the monitoring center via the network first, only the still images selected from the list image are transmitted from the remote place to the monitoring center via the network. The time required for transmission / reception can be shorter than the case where individual still images constituting the list image are transmitted to the monitoring center via the network one by one.

Therefore, also from this point, it is possible to obtain an effect that it becomes easier for the monitoring center side to confirm the situation of the monitoring target site by the still image.

Further, according to the present invention, it is possible to arbitrarily select which of the situation before the alarm signal is generated and the situation after the alarm signal is mainly confirmed from the still image. .

Further, according to the present invention, the remote side and the monitoring center side each have a first IP address having a single IP address.
The remote monitoring device and the second remote monitoring device are installed respectively, and TCP / IP and UDP / Both a list image and a still image can be transmitted from a remote location to the monitoring center and control data can be transmitted from the monitoring center to the remote location via a network having IP as a communication protocol.

Therefore, TCP / IP or UDP / IP
Via a network with a communication protocol of
It is possible to effectively transmit and receive the list image, the still image and the control data between the monitoring centers in a space-saving, low cost and efficient manner.

[0227] In addition, a packet composed of control data in binary data format is transmitted by TCP / IP or UDP / IP.
Can be transmitted from a monitoring center to a remote place via a network having a communication protocol of.

Therefore, for example, even when the remote monitoring device of the monitoring center has an input port for the control data in the binary data format, the control data input from the monitoring center side to the input port causes TCP / IP or UDP. The effect that the remote monitoring device at a remote place can be controlled via a network using / IP as a communication protocol is obtained.

Further, for example, when the remote monitoring device at the remote place is provided with an output port of the control data in the binary data format for controlling the peripheral equipment, from the monitoring center side,
With the control data input to the input port of the remote monitoring device of the monitoring center, it is possible to control peripheral devices at remote locations via a network using TCP / IP or UDP / IP as a communication protocol.

Also, according to the present invention, TCP / IP and U
While a list image or a still image is being sent from a remote location to the monitoring center via a network using DP / IP as a communication protocol, a communication failure may occur in the remote monitoring equipment at the network or remote location or the remote monitoring equipment at the monitoring center. However, when the communication failure recovers, the connection between the remote monitoring device at the remote location and the remote monitoring device at the monitoring center is quickly reestablished, and the transmission of list images and still images from the remote location to the monitoring center is restarted. It

As described above, since the list image and the still image transmission to the monitoring center are resumed immediately after the recovery of the communication failure, the monitoring center side also confirms the situation of the monitoring target site by the still image. The effect that it becomes easy to perform is obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an overview of a remote monitoring system according to the present invention.

FIG. 2 is a diagram showing a system configuration example of a remote place.

FIG. 3 is a diagram showing a system configuration example of a monitoring center.

FIG. 4 is a diagram showing a configuration example of a remote monitoring device at a remote place.

FIG. 5 is a diagram showing a configuration example of a remote monitoring device of a monitoring center.

FIG. 6 is a diagram showing a structure of a control packet.

FIG. 7 is a flowchart showing a process of a remote monitoring device at a remote location regarding still image display on the monitoring center side.

FIG. 8 is a flowchart showing a process of a remote monitoring device of the monitoring center regarding still image display on the monitoring center side.

FIG. 9 is a diagram showing a monitor display example of a list image when an alarm signal is generated.

FIG. 10 is a diagram showing a monitor display example of a list image when an alarm signal is generated.

FIG. 11 is a diagram showing a monitor display example of still images selected from a list image.

FIG. 12 is a diagram showing a monitor display example of a list image in a normal state.

FIG. 13 is a diagram illustrating a monitor display example of a list image in a normal state.

FIG. 14 is a flowchart showing processing of a remote monitoring device at a remote place regarding transmission / reception of images and control data.

FIG. 15 is a flowchart showing processing of the remote monitoring device of the monitoring center regarding transmission / reception of video and control data.

FIG. 16 is a flowchart showing a communication failure countermeasure process in a remote monitoring device at a remote place.

FIG. 17 is a flowchart showing a communication failure countermeasure process in the remote monitoring device of the monitoring center.

[Explanation of symbols]

1 remote monitoring device (transmitter), 1a, 11a device body, 1b, 11b operating device, 2, 12 monitor,
3 video cameras, 4 microphones, 5 sensors,
6 peripheral device control device, 11 remote monitoring device (receiver), 13 speaker, 14 personal computer, 21, 22 input switching circuit, 23, 24 A
/ D converter, 25 video compression circuit, 26 audio compression circuit, 27, 42 RTP block, 28 camera / still image control block, 29 still image acquisition circuit, 3
0 still image memory, 31 still image display control block,
32 TELNET server, 33 control packet analysis block, 34, 49 communication control block, 3
5, 41 communication interface, 36, 45, 46
D / A converter, 37, 50 Interface with operating device, 43 Video decompression circuit, 44 Audio decompression circuit,
47 control packet building block, 48 TELNE
T client, 61 remote area, 62 monitoring center, 63 WAN

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04Q 9/00 331 H04Q 9/00 331Z 341 341Z (72) Inventor Haruko Morita 6-chome Kitashinagawa, Shinagawa-ku, Tokyo No. 7-35 In Sony Corporation (72) Inventor Minako Takeishi 6-7 Kita-Shinagawa, Shinagawa-ku, Tokyo No. 35 In Sony Corporation (72) Keiko Kishi 6-7 Kita-Shinagawa, Shinagawa-ku, Tokyo No. 35 Sony Corporation F-term (Reference) 5C054 AA01 AA05 DA06 FA00 FE02 FE11 GA00 GB02 HA18 5C087 AA08 AA24 BB12 BB65 BB74 DD03 DD23 DD27 EE02 FF01 FF02 FF19 GG02 5K030 HA08 HB02 HB06 LB14 A02B02 MB02 5A030 FB10 GB05 HA02

Claims (8)

[Claims] 1. A plurality of video input terminals, an input switching means for switching and selecting a video input to each one of the plurality of video input terminals, and the input switching means. Still image acquiring means for acquiring a still image from video, accumulating means for accumulating the still image acquired by the still image acquiring means, a video output terminal, and a time series or a camera as an aspect of the arrangement of a plurality of still images. First operation means for designating another time series, second operation means for instructing to display a list of a plurality of still images, and based on an operation of the second operation means, to the storage means. First control means for reducing a plurality of accumulated still images to create a list image arranged in a manner designated by the first operation means, and outputting the list image from the video output terminal; Select one still image in the list image And a second control means for reading the still image selected by the third operation means from the storage means and outputting the still image from the video output terminal. Remote monitoring device. 2. The remote monitoring device according to claim 1, wherein an alarm signal input terminal and fourth operation means for setting the number of still images to be acquired by the still image acquisition means after the alarm signal is generated. And after the alarm signal is input to the alarm signal input terminal, the acquisition of still images by the still image acquisition unit is stopped when the number of still images set by the fourth operation unit is acquired. The remote monitoring device further comprising: 3. The remote monitoring device according to claim 1, wherein a request is made for a communication interface for performing communication via a network and a transmission of the list image in either a time series or a camera-based time series. Based on the control data received by the communication interface, a plurality of still images accumulated in the accumulating unit are reduced to create a list image arranged in this manner, and the list image is transmitted from the communication interface. Third control means, and based on the control data requesting transmission of one still image in the list image received by the communication interface, the still image is read from the storage means and transmitted from the communication interface. And a fourth control means for controlling the remote monitoring device. 4. A communication interface for communicating via a network, a video output terminal, and first operating means for designating a time series or a camera-based time series as a mode of arrangement of a plurality of still images. A second operation unit for instructing a list display of a plurality of still images; and a plurality of still images reduced in size based on an operation of the second operation unit and designated by the first operation unit. First control means for transmitting control data requesting transmission of a list image arranged in a manner from the communication interface, and outputting the list image received by the communication interface according to the control data from the video output terminal. , A third operation unit for selecting one still image in the list image, and control data requesting transmission of the still image selected by the operation of the third operation unit to the communication interface. Sending from over the face, a second outputting a still image received by the communication interface in accordance with the control data from the video output terminal
And a remote control device. 5. A first remote monitoring device and a second remote monitoring device each having a communication interface for performing communication via a network, wherein the first remote monitoring device includes a plurality of video input terminals. An input switching unit for switching and selecting an image to be input to each one of the plurality of video input terminals; and a still image acquiring unit for acquiring a still image from the image selected by the input switching unit. And storage means for accumulating still images acquired by the still image acquisition means, and control data for requesting transmission of images in which a plurality of still images are arranged in either a time series or a time series by camera. On the basis of the reception by the communication interface, a plurality of still images accumulated in the accumulating unit are reduced to create a list image arranged in the mode, and the list image is generated by the communication interface. The first control means for transmitting from the source and the control data requesting transmission of one still image in the list image is received by the communication interface, and the still image is read from the storage means. The second remote monitoring device specifies a video output terminal and a time series or a time series for each camera as an arrangement mode of a plurality of still images. And a second operation means for instructing the display of a list of a plurality of still images, and a plurality of still images based on the operation of the second operation means. The control data requesting the transmission of the images arranged in the mode specified by is transmitted from the communication interface, and the list image received by the communication interface according to the control data is transmitted to the video image. A first control unit for outputting from the input terminal, a third operation unit for selecting one still image in the list image, and a transmission of the still image selected by the operation of the third operation unit. A second control device transmits the requested control data from the communication interface, and outputs the still image received by the communication interface according to the control data from the video output terminal.
And a control means of the remote monitoring system. 6. A first remote monitoring device and a second remote monitoring device each having a communication interface for performing communication via a network are connected to the network, and the first remote monitoring device comprises a plurality of A video input terminal, input switching means for switching and selecting a video input to one of the plurality of video input terminals, and a still image is acquired from the video selected by the input switching means. Still image acquisition means, storage means for accumulating still images acquired by the still image acquisition means, an alarm signal input terminal, and an alarm signal input to the alarm signal input terminal based on the network First control means for calling the second remote monitoring device via a plurality of still images and a plurality of still images are arranged in a time series or a time series for each camera. Based on receiving control data requesting image transmission from the first remote monitoring device via the network, a plurality of still images accumulated in the accumulating unit are reduced and a list image arranged in this mode is displayed. Second control means for creating the list image and transmitting the list image to the second remote monitoring device via the network, and control data requesting transmission of one still image in the list image via the network. A third control unit for reading the still image from the storage unit and transmitting the still image to the second remote monitoring device via the network based on the reception from the first remote monitoring device; Of the remote monitoring device, a video output terminal, a first operation means for designating a time series or a time series for each camera as an arrangement mode of a plurality of still images, and a list display of a plurality of still images. After establishing the connection between the second operation means for instructing and the first remote monitoring device via the network, a plurality of still images are displayed on the first still image based on the operation of the second operation means. The control data requesting transmission of the images arranged in the mode designated by the operating means, is transmitted to the first remote monitoring device via the network, and the first remote monitoring device is transmitted via the network according to the control data. First control means for outputting the list image received from the monitoring device from the video output terminal, third operation means for selecting one still image in the list image, and the third operation means The control data requesting transmission of the still image selected by the operation of
Second control means for transmitting the still image received from the first remote monitoring device via the network according to the control data to the still image monitoring device, and outputting the still image from the video output terminal. And remote monitoring system. 7. The remote monitoring system according to claim 6, wherein the communication interface uses TCP / IP and / or UDP / IP as a communication protocol, and the first remote monitoring device and the second remote monitoring device. An IP address is set on the network respectively, and the first remote monitoring device is composed of an RTP block that constitutes an RTP packet from the list image and the still image, and control data in a binary data format. TELNET that uses the port number that enabled the transferred packets
The second remote monitoring device further includes a server, and the second remote monitoring device uses an RTP block that restores an image from an RTP packet, and a TELNET that uses a port number that enables transfer of a packet including control data in a binary data format.
And a packet configured by the RTP block of the first remote monitoring device, the packet being transmitted from the first remote monitoring device to the second remote monitoring device.
Packet sent to the remote monitoring device of the second remote monitoring device to the RTP block of the second remote monitoring device and output from the TELNET.
The remote monitoring system is transmitted from the remote monitoring device to the second remote monitoring device and sent to the TELNET server. 8. The remote monitoring system according to claim 6, wherein the communication interface uses TCP / IP and / or UDP / IP as a communication protocol, and the first remote monitoring device transmits an RTP packet from video. The second remote monitoring device further includes an RTP block that configures the second remote monitoring device, and the second remote monitoring device further includes an RTP block that restores an image from an RTP packet. The connection with the second remote monitoring device is established and the first remote monitoring device is established. From the video selected by the input switching means of the remote monitoring device, the RTP packet configured by the RTP block of the first remote monitoring device is transferred from the first remote monitoring device to the second remote monitoring device. Sent to
Sent to the RTP block of the second remote monitoring device, wherein the first control means of the first remote monitoring device establishes a connection with the second remote monitoring device before the second remote monitoring device is established. Based on the fact that the RTCP packet is not received from the monitoring device for a certain period of time or more, the connection with the second remote monitoring device is disconnected and the second remote monitoring device is called again, and the second remote monitoring device is RT to RTP block
An RTCP packet indicating whether or not a P packet is transmitted is transmitted to the first remote monitoring device, and
The remote monitoring system further comprising third control means for disconnecting the connection with the first remote monitoring device when the RTP block does not receive an RTP packet for a predetermined time or longer.