JPH08163543A - Remote supervisory equipment - Google Patents

Abstract

PURPOSE: To attain supervision of video image in following to movement of a truck without detecting the position of the truck when a video image of a wide area is supervised. CONSTITUTION: An ITV camera 2 mounted on a truck 1 picks up an image of a monitored area sequentially and uses a light emitting device 3 to convert the video signal into an optical signal and sent to ground devices 21a to 21n. The optical signal sent from the light emitting device 3 is received by a receiver 22 at an opposite position. The receiver 22 converts the received optical signal into an electric signal and outputs it to a modulator 23. The modulator 23 converts the video signal into a high frequency signal with a different frequency allocated in advance and outputs it to a supervisory room equipment 30. The supervisory room equipment 30 selects sequentially a signal of a different channel and demodulates it by using a demodulator 31 to discriminate the presence of the video signal and when no video signal is in existence, a succeeding channel is selected and when the video signal is detected, the channel selection is fixed. The video signal of the channel is monitored by a monitor TV 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mounts a camera on a trolley which is laid in a range required for monitoring when a video image of a region having a two-dimensional spread is mounted with a camera while moving. The present invention relates to a remote monitoring device that captures an image of a monitoring area and remotely monitors the situation at the site.

[0002]

2. Description of the Related Art Conventionally, for example, when monitoring shelves in a warehouse, monitoring the substation premises, etc., an ITV camera is mounted on a mobile trolley, and a remote monitoring is performed to monitor a predetermined monitoring area while moving the trolley. Surveillance equipment is used.

FIG. 5 shows an example of the configuration of a remote monitoring device when the carriage moves linearly. In FIG. 5, reference numeral 1 denotes a dolly, which is mounted with an ITV camera 2 and a light transmitter 3 for taking a picture of the state of the monitored place, and moves on a track 4 linearly laid. The light transmitter 3 converts the signal photographed by the ITV camera 2 into an optical signal and sends it to the ground equipment. On the ground side, the optical signal sent from the light transmitter 3 is received by the light receiver 5, and the monitor TV installed in the monitoring room
6 is output.

As described above, the ITV camera 2 is mounted on the dolly 1 to photograph the state of the monitored place while moving on the track 4, and the photographed signal is converted into an optical signal by the light transmitter 3 and the ground side is obtained. The status of the monitored place over a wide range can be constantly monitored by the monitor TV 6 in the monitoring room.

FIG. 6 shows an example of the configuration of a remote monitoring device for performing video monitoring in a planarly spread range. In FIG. 6, reference numeral 10 denotes a monitored area that is wide in plan view, and the track 4 is laid around the monitored area so as to form a rectangle. On the track 4, the carriage 1 equipped with the ITV camera 2 and the light transmitter 3 orbits in a fixed direction as indicated by an arrow. On the ground side, a plurality of, for example, four light receivers 5 for receiving the optical signal from the light transmitter 3 around the orbit 4 are provided.
a to 5d are provided. The received signals from the light receivers 5a to 5d are input to the video switcher 11 provided in the monitoring room. A trolley position detecting device 12 for detecting the position of the trolley 1 is provided on the ground side. This cart position detection device 1
2 detects the position of the carriage 1 and outputs the position detection signal to the video switcher 11. The video switcher 11 sequentially selects the outputs of the light receivers 5a to 5d which are supposed to transmit the video from the light transmitter 3 based on the detection signal of the trolley position detection device 12, and outputs them to the monitor TV 6. To do.

In the above structure, the ITV camera 2 mounted on the trolley 1 is monitored by the ITV camera 2 as the trolley 1 travels.
The inside of 0 is photographed sequentially. The video signal captured by the ITV camera 2 is converted into an optical signal by the light transmitter 3 and transmitted to the ground equipment side. This transmission signal is received by the light receivers 5a to 5d.
Are selectively received by and sent to the video switcher 11. The video switcher 11 sequentially selects the outputs of the light receivers 5a to 5d that are supposed to transmit the video from the light transmitter 3 based on the detection signal of the carriage position detection device 12, and, for example, FIG.
In this state, the output of the light receiver 5a is selected and output to the monitor TV 6.

As the trolley 1 travels around the monitored area 10 as described above, the state of the monitored area 10 can be constantly monitored by the monitor TV 6. FIG. 7 shows the video signal output of the light receivers 5a to 5d when the ITV camera 2 mounted on the trolley 1 monitors the monitored area 10 which has a two-dimensional spread as in the case shown in FIG. It is configured to be connected by a bus-shaped transmission cable 13 and output to the monitor TV 6. In the case of such a configuration, only the necessary light receivers are used so that the video signal outputs of the plurality of light receivers 5a to 5d do not collide on the transmission cable 13, and the other light receivers do not output signals. Control is needed. Therefore, the detection signal of the trolley position detection device 12 is sent to the light receivers 5a to 5d through the control line 14, the output of the light receiver that is supposed to transmit the video signal is turned on, and the outputs of the other light receivers are turned off. By doing so, the monitor TV 6 can monitor.

[0008]

A plurality of light receivers 5a to 5d are used to monitor an image of an area having a two-dimensional spread.
In order to install the trolley 1, the trolley position detecting device 12 for grasping the position of the trolley 1 is required. In addition, as shown in FIG. 6, a cable may be individually provided between the light receivers 5a to 5d and the monitoring room, or a video signal may be provided between the light receivers 5a to 5d and the monitoring room as shown in FIG. In addition to the cable for transmitting the light, a control line 14 for controlling the light receivers 5a to 5d is required, which causes a problem that the device configuration becomes complicated.

The present invention has been made in view of the above circumstances, and in the case of monitoring an image of a two-dimensionally wide area, the image can be monitored by following the movement of the truck without detecting the position of the truck. The purpose of the present invention is to provide a remote monitoring device.

[0010]

SUMMARY OF THE INVENTION The present invention is a remote monitoring device in which an imaging device is mounted on a trolley which is laid in a range required for monitoring, and which is mounted on a trolley, and an image of a monitoring region is taken while moving to remotely monitor. In, a light transmitter that outputs a video signal photographed by a photographing device mounted on the carriage as an optical signal, and an optical signal that is installed on the ground side along the track and receives the optical signal output from the light transmitter. A plurality of light receivers for converting into electric signals, a modulator provided corresponding to each of the above light receivers, and outputting output signals of the light receivers as carrier signals of different high frequency channels, and each of these modulators. The high-frequency signal transmitting the video signal is selected from the high-frequency signals transmitted from the device via the coaxial cable, and the demodulator that demodulates the high-frequency signal into the video signal and the video signal demodulated by the demodulator are displayed. Characterized in that it was and a Nita TV.

[0011]

The ITV camera mounted on the truck sequentially photographs the monitored area as the truck travels, converts the video signal into an optical signal by the light transmitter, and transmits the optical signal to the ground equipment. The optical signal transmitted from the light transmitter is received by the light receiver of the ground device facing the light transmitter, converted into an electric signal and transmitted to the modulator. The modulator of each terrestrial device converts the video signal received by the light receiver into a high-frequency signal of a different pre-allocated channel and outputs it. The high-frequency signal output from each ground device is multiplexed by the coaxial cable and sent to the monitoring room device. In this case, the optical signal output from the light transmitter mounted on the truck is basically received by one ground device, and the monitoring video signal from one of the ground devices is the monitoring room device. Sent to.

In the monitoring room device, the signals of different channels are sequentially selected by the channel selector, and demodulated by the demodulator to determine the presence / absence of a video signal. If there is no video signal, the next channel is selected, and if a video signal is detected, the channel selection is fixed. The video signal of the fixed channel is sent to the monitor TV, displayed on the monitor, and remotely monitored.

As described above, the monitoring video signal sent from the ground device to the monitoring room device via the coaxial cable as the truck travels is selected and processed by the channel selection unit, and is output from each ground device. Even if the high frequency signal is multiplexed by the coaxial cable, it is displayed on the monitor TV without causing interference.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a remote monitoring device according to an embodiment of the present invention. This embodiment shows a case where a region having a two-dimensional spread is monitored, and a combination of straight lines or a track formed in a curved castle is laid around the monitored region. And IT on this orbit
A dolly 1 equipped with a V camera 2 and a light transmitter 3 orbits.

On the other hand, on the ground side, a plurality of ground devices 21a, 2a for receiving the optical signal from the light transmitter 3 around the orbit.
1b, ..., 21n are provided. The above ground device 21a,
21n are configured by a light receiver 22 and a modulator 23 that receive an optical signal from the light transmitter 3. The light receiver 22 converts an optical signal sent from the light transmitter 3 into an electric signal and inputs the electric signal to the modulator 23. The modulator 23 converts the video signal output from the light receiver 22 into a signal of a high frequency channel such as a VHF band and outputs the signal.

The above ground devices 21a, 21b, ..., 21n
As shown in FIG. 2, each of the modulators 23 performs modulation processing using carrier signals, that is, channels having different center frequencies f1, f2, ... Fn, and their modulation outputs are connected in a bus or tree form. The monitoring room device 3 is multiplexed by the transmitted transmission cable, for example, the coaxial cable 27.
Sent to 0.

The monitoring room device 30 comprises a demodulator 31, a monitor TV 32, a video signal detecting section 33 and a channel selecting section 34. The video signal detection unit 33 determines the presence or absence of a video signal from the demodulated signal of the demodulator 31, and outputs the determination result to the channel selection unit 34. The channel selection unit 34 performs the next channel selection for the demodulator 31 when the video signal detection unit 33 determines that there is no video signal, and fixes the channel selection when the video signal is detected.

FIG. 3 shows the configuration of the demodulator 31, the video signal detector 33, and the channel selector 34. The demodulator 31 includes a tuner 311, a VIF (video intermediate frequency) unit 312, a PLL circuit 313, and an amplifier 3.
14, the output of the VIF unit 312 is sent to the video signal detector 33, and the output of the channel selector 34 is P.
It is input to the LL circuit 313. The tuner 311 is
A high-frequency signal sent from the modulator 23 of the ground equipment 21a, 21b, ... Via the coaxial cable 27 is channel-selected under the control of the PLL circuit 313, converted into an intermediate frequency, and output to the VIF unit 312. This VI
The F unit 312 amplifies and then demodulates the intermediate frequency signal output from the tuner 311, and outputs the demodulated signal to the video signal detection unit 33.

The video signal detector 33 determines whether or not a video signal is present in the output signal of the VIF unit 312,
The determination result is output to the channel selection unit 34. When the video signal detection unit 33 determines that there is no video signal, the channel selection unit 34 includes the PLL circuit 313 of the demodulator 31.
A control signal is output so as to select the next channel. As a result, the PLL circuit 313 changes the reception frequency of the tuner 311 so as to receive the next channel.

Thereafter, the reception channel of the tuner 311 is sequentially changed until the video signal is detected in the same manner.
Then, when the video signal is detected by the video signal detection unit 33, the channel selection unit 34 fixes the reception channel. Then, the video signal output from the VIF unit 312 is sent to the monitor TV 32 via the amplifier 314 and is displayed on the monitor.

Next, the overall operation of the above embodiment will be described.
In FIG. 1, the ITV camera 2 mounted on the carriage 1 is
The regions to be monitored are sequentially photographed as the truck 1 travels. The video signal captured by the ITV camera 2 is transmitted by the light transmitter 3
Are converted into optical signals and transmitted to the ground devices 21a, 21b, .... The optical signals transmitted from the light transmitter 3 are ground devices 21a, 21b, ...
It is received by the light receiver 22. The light receiver 22 converts the received optical signal into an electric signal and outputs it to the modulator 23.

Each modulator 2 of the ground devices 21a, 21b, ...
Reference numeral 3 converts the video signal input from the light receiver 22 into high-frequency signals of different channels which are assigned in advance and outputs the high-frequency signal. The high frequency signals output from the ground devices 21a, 21b, ... Are multiplexed by the coaxial cable 27 and sent to the monitoring room device 30. In this case, the optical signal output from the light transmitter 3 mounted on the truck 1 is basically received by one of the ground devices 21a, 21b, ... A monitoring video signal is sent to the monitoring room device 30 from one of 21b, ...

In the monitoring room device 30, the channel selection unit 3
In step 4, different channels, that is, signals of frequencies f1 to fn are sequentially selected, demodulated, and the presence or absence of a video signal is determined by the video signal detection unit 33. If there is no video signal, the channel selector 34 selects the next channel, and when the video signal is detected, the channel selection is fixed. The video signal of this fixed channel is sent to the monitor TV 32 and displayed on the monitor for remote monitoring.

As described above, the monitoring video signals sent from the ground devices 21a, 21b, ... To the monitoring room device 30 via the coaxial cable 27 as the truck 1 travels are selected and processed by the channel selection unit 34. Therefore, each ground device 21
Even if the high frequency signals output from a, 21b, ... Are multiplexed by the coaxial cable 27, they are displayed on the monitor TV 32 without causing interference.

Next, an example of arrangement of the above ground devices 21a, 21b, ... Will be described with reference to FIG. FIG. 4A shows the positional relationship between the ground device 21a and the ground device 21b, and the receivable ranges A and B of the ground device 21a and the ground device 21b show a state where there is an overlapping portion 40 with respect to the track 4. In this overlapping portion 40, both the ground device 21a and the ground device 21b are connected to the light transmitter 3
The high-frequency signal having the video signal is output by receiving the optical signal from the demodulator 31 and the demodulator 31 may receive either one. When the light transmitter 3 mounted on the carriage 1 moves on the track 4 from the ground device 21a to the ground device 21b side, the monitoring room device 30 searches for the next high frequency signal at the time when the reception of the ground device 21a is completed, A high frequency signal having a video signal sent from the ground device 21b is selected.

Although FIG. 4B shows the case where the overlapping portion 40 is set small, the same processing operation as in FIG. 4A is performed. FIG. 4C shows an example of a case where the dead zone 41 is formed by eliminating the overlapping portion. By providing the dead zone 41 in this way, the ground device 2
After the reception of 1a is completed, the video signal cannot be received while passing through the dead zone 41. Therefore, in order to eliminate the dead zone 41 as much as possible, the ground devices 21a, 21b,
It is desirable to set the position of.

[0027]

As described above in detail, according to the present invention, in the case of monitoring an image in a plane-wide area,
By moving the truck equipped with the camera on the orbit,
When the light receiving device that receives the optical signal transmitted from the light transmitter on the trolley changes sequentially, the ground device transmits the monitoring video signal to the monitoring room device with high frequency signals of different frequencies,
Since the high frequency signal including the video signal is selected and demodulated on the side of the monitoring room, it is possible to transmit light mounted on the truck without detecting the position of the truck and switching the operation of the ground equipment. The video signal sent from the device can be continuously monitored.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a frequency setting example of a high-frequency output signal of each ground device in the embodiment.

FIG. 3 is a configuration diagram showing details of a main part of a monitoring room device in the embodiment.

FIG. 4 is a diagram showing an arrangement example of ground equipment in the same embodiment;

FIG. 5 is a diagram showing an example of conventional remote monitoring in the case where a camera is mounted on a carriage that moves in a straight line and video monitoring is performed.

FIG. 6 is a diagram showing a configuration example of a conventional remote monitoring device in the case of monitoring an image in a planarly spread area.

FIG. 7 is a diagram showing another configuration example of a conventional remote monitoring device in the case of video-monitoring a region having a two-dimensional spread.

[Explanation of symbols]

 1 vehicle 2 ITV camera 3 light transmitter 4 orbit 21a to 21n ground device 22 light receiver 23 modulator 27 coaxial cable 30 monitoring room device 31 demodulator 32 monitor TV 33 video signal detector 34 channel selector 311 tuner 312 VIF unit 313 PLL circuit 314 amplifier

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04B 10/22

Claims (1)

[Claims] 1. A remote monitoring device for mounting a photographing device on a truck that moves on an orbit laid in a range required for monitoring, and remotely monitors by photographing a monitoring area while moving. A light transmitter that outputs a video signal photographed by a photographing device as an optical signal, and a plurality of light transmitters that are installed on the ground side along the trajectory and that receive the optical signal output from the light transmitter and convert it into an electric signal And a modulator which is provided corresponding to each of the above-mentioned light-receivers, and which outputs the output signal of the light-receiver as a carrier signal of a different high-frequency channel, and transmission from each of these modulators via a coaxial cable. A demodulator for selecting a high-frequency signal transmitting a video signal from the high-frequency signals to be demodulated into a video signal, and a monitor TV for displaying the video signal demodulated by the demodulator are provided. Remote monitoring device, wherein the door.