JPH04257197A - Remote monitor device - Google Patents

Abstract

PURPOSE:To monitor image information at one place at the same time by using a transfer control means and transferring image information of one selected camera to plural monitor terminal devices. CONSTITUTION:This device is equipped with an image input part 22, an image storage part 18, and an image switching control part 13 as an input means for inputting the image information of a video camera 3. A control part 13 inputs a camera selecting signal from a monitor terminal device where a communication path is set through a transmitting/receiving means. Control for selecting image information of one of video cameras 31-3n according to the camera selecting signal is performed and the image information is supplied to a 23B+D frame composition and decomposition part 10 and an LAPD control part 11. Then a broadcast type transfer control part 17 performs control for transferring the image information to the corresponding monitor devices. Then the control part 17 transfer the selected one piece of image information to the terminal devices in broadcast form and the image information at one place can be monitored on the monitor devices at the same time.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention is applied to a remote control type remote monitoring device. In particular, broadcast-type remote monitoring in which moving image information taken with a video camera or still image information taken with a still camera is displayed on multiple monitor terminal devices from a remote location via an integrated service digital network (hereinafter referred to as ISDN). It is related to the device.

0002

2. Description of the Related Art Conventionally, when a remote monitoring device performs remote monitoring via a telephone network, a method has been adopted in which sensor information with a small amount of information is transmitted from a remote location and received by a terminal device.

[0003] On the other hand, ISDN, whose service has been started in recent years,
It has become easy to send and receive digital information at transmission speeds of 64 kbit/s to 1.5 Mbit/s. However, with the developed device, because the communication format was one-to-one, image information taken with one camera could only be received by one monitor terminal device, and even if other terminal devices tried to request monitoring, Could not connect.

0004

[Problems to be Solved by the Invention] However, with such conventional remote monitoring devices, when using a telephone network or ISDN, only one monitor terminal device can receive signals, so other terminal devices cannot monitor the data. There was a problem where it was not possible to connect even if requested.

[0005] The present invention solves the above problems.
It is an object of the present invention to provide a remote monitoring device that can simultaneously monitor image information of one point using a plurality of monitor terminal devices.

[0006]

[Means for Solving the Problems] The present invention receives transmission request signals from a plurality of monitor terminal devices via a comprehensive service digital network, establishes a communication path with the destination monitor terminal device, and sends a response signal. A transmitting/receiving means for transmitting data, a plurality of cameras for monitoring an object to be monitored, an input means for inputting image information of the plurality of cameras, and a communication path from a monitor terminal device with which the communication path has been established via the transmitting/receiving means. a selection control means for inputting a camera selection signal and controlling to select one of the image information of the plurality of cameras based on the signal; and selecting one of the image information of the plurality of cameras based on control of the selection control means; In the remote monitoring device, the transfer control means transmits the image information of the selected camera to the plurality of corresponding monitor terminal devices. It is characterized in that it includes a control means for causing the monitor terminal device to transmit data in broadcast format.

Further, the present invention provides that the interface of the comprehensive service digital network is a primary rate interface 2.
It can be 3B+D. Further, in the present invention, the plurality of monitor terminal devices can include means for performing multi-destination communication.

[0008]

[Operation] The transfer control means provides the image information of the selected camera to the transmitting/receiving means and causes the image information to be transmitted to the corresponding plurality of monitor terminal devices in a broadcast format. As described above, image information of one point can be monitored simultaneously by a plurality of monitor terminal devices.

[0009]

Embodiments Examples of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a remote monitoring device according to an embodiment of the present invention. FIG. 2 is a block diagram of the broadcast type transfer control section of the remote monitoring device of the present invention. FIG. 3 is a block diagram of a communication system to which the remote monitoring device of the present invention is applied.

In FIGS. 1 to 3, the remote monitoring device 2 includes:
Multiple monitor terminal devices 61 to 6n via ISDN1
The destination monitor terminal device 6 receives a transmission request signal from
A line interface section 9, a 23B+D frame assembly/disassembly section 10, an LAPD control section 11, a multi-channel layer 3 control section 12, and a B channel buffer section 141 serve as transmitting/receiving means for establishing a communication path between the two and transmitting a response signal.
~14n, a video camera 31~3n as a plurality of cameras for monitoring objects to be monitored, and a video camera 3.
An image input unit 22 as an input means for inputting image information of
A camera selection signal is input from the monitor terminal device 6 with which the communication path has been established to the image encoding unit 20 and the image storage unit 18 via the transmitting/receiving means, and based on the signal, one of the image information of the video cameras 31 to 3n is input. An image switching control section 13 serves as a selection control means for controlling the selection of the video cameras 31 to 3n based on the control of the image switching control section 13.
A broadcast-type transfer control section 17 is provided as a transfer control means for selecting one of the image information and giving it to the 23B+D frame assembly/disassembly section 10 and the LAPD control section 11 to transmit it to the corresponding monitor terminal device 6.

The feature of the present invention is that the broadcast type transfer control section 17 includes a control means for transmitting the selected image information to the plurality of corresponding monitor terminal devices 6 in a broadcast format. be.

[0012] Also, the interface of the comprehensive service digital network is the primary rate interface 23B+D.

Furthermore, the plurality of monitor terminal devices described above include means for performing multi-destination communication.

[0014] The operation of the remote monitoring device having such a configuration will be explained.

In FIG. 3, there is an ISD on the remote monitoring device 2 side.
By using the 23B+D type of the N1 primary group interface, 23 lines of 64 kbit/s B channel can be multiplexed and accommodated in the remote monitoring device 2. The monitor terminal devices 61 to 6n use the ISDN1 basic access interface (2B+D). Therefore, in the remote monitoring device 2, 23 monitor terminal devices 6 are connected to ISDN at one time.
Monitoring can be done via 1.

Further, the plurality of video cameras 31 to 3n for capturing image information are directly connected to the remote monitoring device 2, and the image information inputted from the video camera 3 is transmitted to the remote monitoring device 2.
It is accumulated in

As a specific method of operating the monitor terminal device 6, first, a call operation is performed from the monitor terminal device 6 side to the remote monitoring device 2. The remote monitoring device 2 accepts the incoming call,
When the communication state is established, the monitor terminal device 6 sends a camera selection signal to the remote monitoring device 2, and the remote monitoring device 2, which has received this camera selection signal, outputs image information of the selected video camera 3. Furthermore, when it is desired to switch to the screen of another video camera 3, the monitor terminal device 6 sends out the camera selection signal again.

FIG. 1 shows an example of a remote monitoring device 2 in which there are two video cameras 3. ISDN from monitor terminal device 6
When a transmission request signal is sent via the 23B+D frame disassembly section 10, it is received by the line interface section 9 and input to the 23B+D frame assembly/disassembly section 10. 23B+D frame assembly and disassembly section 10
decomposes the D channel included in this incoming signal and
It is given to the PD control unit 11. The LAPD control section 11 performs error control on the D channel signal, converts a serial code into a parallel code, and provides the parallel code to the layer 3 control section 12 for multiple channels. The multi-channel layer 3 control unit 12 identifies the destination address and terminal type included in the incoming signal, and establishes a communication path with the destination monitor terminal device 6 if communication is possible. Therefore, a response signal is generated, superimposed on the D channel via the LAPD control unit 11, and sent to the ISDN 1. At the same time, one line out of the 23 lines is reserved for image information between the monitor terminal device 6 and one B channel buffer unit 14 is operated.

Next, when a camera selection signal is sent from the monitor terminal device 6 to the remote monitoring device 2 via the ISDN 1, the multi-channel layer 3 control unit 12 identifies the camera selection signal and identifies it. The result is notified to the image switching control section 13. The image switching control unit 13 uses a broadcast type transfer control unit to send the image information input from the specified video camera 3 to the B channel established between the remote monitoring device 2 and the monitor terminal device 6. A control signal is given to 17. Image information input from the video camera 31 is taken into the image input section 221, and converted into digital code by the image encoding section 201.
Since the transfer rate is 4 kbit/s, the data is compressed and encoded and stored in the image storage unit 181. Further, the broadcast type transfer control section 17 includes a B channel buffer section 141.
, 142 to 14n, and the transmission rate of 64 kbit/s is 1.5 in the 23B+D frame assembly/disassembly unit 10.
The data is converted to a transmission rate of Mbit/s and sent from the line interface unit 9 to the monitor terminal device 6 via the ISDN 1.

FIG. 3 shows the logical circuit configuration of the broadcast type transfer control section 17, and shows the configuration when there are two video cameras and the number of lines is three, and the number of video cameras and lines can be selected arbitrarily. be.

[0021] Each B channel buffer section 141 to 143
The configuration is such that either image information can be extracted, and which image information is extracted is selected by a control signal from the image switching control section 13. That is, each monitor terminal device 6
can monitor the image information of the desired video camera by sending out a camera selection signal. However, each monitor terminal device 6 cannot monitor multiple pieces of image information at the same time.

[0022]

As explained above, the present invention has an excellent effect in that image information of one point can be monitored simultaneously by a plurality of monitor terminal devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a remote monitoring device according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a broadcast type transfer control section of the remote monitoring device of the present invention.

FIG. 3 is a block configuration diagram of a communication method to which the remote monitoring device of the present invention is applied.

[Explanation of symbols]

1 ISDN 2 Remote monitoring device 31 to 3n Video camera 61 to 6n Monitor terminal device 9 Line interface section 10 23B+D frame assembly and disassembly section 11 LAP
D control unit 12 Layer 3 control unit for multiple channels 13 Image switching control unit 141 to 1423 B channel buffer unit 17
Broadcast type transfer control units 181, 182 Image storage units 201, 202 Image encoding units 221, 222 Image input unit 24 AND gate 25 Inverter gate 26 Flip-flop

Claims (3)

[Claims] 1. Transmitting and receiving means for receiving transmission request signals from a plurality of monitor terminal devices via an integrated service digital network, establishing a communication path with the destination monitor terminal device, and transmitting a response signal, and a monitoring target. A plurality of cameras that monitor an object, an input means for inputting image information of the plurality of cameras, and a camera selection signal inputted from the monitor terminal device with which the communication path has been established via the transmitting/receiving means; a selection control means for controlling the selection of one of the image information of the plurality of cameras based on the selection control means; and a selection control means for controlling the selection of one of the image information of the plurality of cameras based on the control of the selection control means, and applying the selected one of the image information of the plurality of cameras to the transmission/reception means. In the remote monitoring device, the transfer control means transfers the image information of the selected camera to the plurality of corresponding monitor terminal devices in a broadcast format. A remote monitoring device characterized by comprising a control means for controlling the remote monitoring device. 2. The remote monitoring device according to claim 1, wherein the integrated service digital network interface is a primary rate interface 23B+D. 3. The remote monitoring device according to claim 1, wherein said plurality of monitor terminal devices include means for performing multi-point communication.