JPH02108398A - Multipoint supervisory equipment - Google Patents

Abstract

PURPOSE:To reduce construction expenses by receiving an image signal to which a discrimination signal is added, storing the image of 1 unit quantity based on the discrimination signal, making into a successive image signal, sending out to a monitor, and making less the installation pieces of transmission lines. CONSTITUTION:Upon receiving a reference signal from a control signal generator 42, a micro computer 47 sends out the changing pulse of every one field or every one frame to a switch 46, changes TV cameras 11-13, selectively outputs the image signal, adds the discrimination signal from a discrimination signal generation device 44 through a discrimination adding switch, and sends out to a transmission line 50. When the signal reaches a reception unit 60, the signal discriminates that an image is outputted from which TV camera from a discrimination number in a discrimination signal decision circuit 61, sends to a CPU 62, and changes a switch 63. Respective video signals store in memories 610-612 through A/D converters 64-66 and memory controllers 67-69. Information being called from the memories 610-612 is outputted to monitors 616-618 through D/A converters 613-615.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-point monitoring device, and particularly to a multi-point monitoring device suitable for monitoring images taken at a large number of monitoring points on a monitor at a remote location. Regarding equipment.

[Prior Art] Figure 4 is a schematic diagram of a conventional multi-point monitoring device. In particular, images captured by multiple television cameras installed at remote locations are selectively displayed on multiple monitors installed at a central location. This is an example of a case where the image is displayed on the screen.

In the figure, 91, 92, 93...9n are multiple television cameras installed at multiple monitoring points, and the images captured by each of the television cameras 91, 92, 93... 9n are transmitted through the transmission line 21. , 22, 23...2n.

The images sent via the transmission lines 21, 22, 23, . . . 2n are manually input to the matrix switcher 53,
Here, images are selected and distributed and displayed on monitor televisions 61, 62, 63, . . . 6n. Incidentally, the matrix switcher 53 is controlled by the microcomputer 52, and based on the control input from the terminal 51, selects the image and determines which monitor television 61, 82, 63, . . . , 6n the image will be displayed on. Control takes place.

The operation of this configuration will be explained below.

Images of multiple monitoring points captured by TV cameras 91, 92, 93...9n are constantly transmitted through transmission lines 21, 22.
．． Matrix switcher 53 through 23...2n
is being sent to. Monitoring points required by center operators and monitors/televisions 61, 6 to display them
When inputting 2゜63...6n from terminal 51,
The matrix is controlled by the microcomputer 52.
The switcher 53 connects the TV cameras 91, 92, 93...
Select 9n and select the specified monitor/television 61,
62, 63. ...Display the image on 6n.

[Problems to be Solved by the Invention] However, such conventional configurations have the following problems.

First, since the transmission lines 21, 22.23...2n are installed for each television camera 91, 92.93...9n, if there are many television cameras 91.92.93-9n, the transmission line 21, 22.23...2n , 22° 23...20 increases, and the effort required to install them becomes extremely large. In particular, if the location of the television cameras 91, 92° 93...9n is far from the center for monitoring, the wiring materials necessary for installing the transmission lines 21, 22, 23...2n This results in a huge amount of installation costs.

Also, if the location of the TV cameras 91, 92, 93...9n is far from the center, it is necessary to install boosters to compensate for the attenuation of the image signal. 22.23. ...2n number is required, and the installation location is TV camera 91,92.9
3...9n and the center, it is necessary to newly install a power supply, etc., and it becomes necessary to expect a very large amount of installation cost.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to reduce the number of transmission lines installed while making it possible to send images from a large number of monitoring points to a center. The object of the present invention is to provide a multi-point monitoring device that makes it possible to reduce such construction costs.

[Means for Solving the Problem] In order to achieve the above object, a multi-point monitoring device according to the present invention includes a television camera installed at a plurality of monitoring points, an identification signal for identifying the television camera, and a television camera. The apparatus includes a transmission line for transmitting an image signal from the transmission line, and a memory means for storing one unit of image from a corresponding television camera according to an identification signal from the transmission line and transmitting it as a continuous image signal.

[Function] With the above configuration, the multi-point monitoring device according to the present invention adds the identification signal to the video signal and differentiates it, so that the signals from the plurality of television cameras are sent through one transmission line, and the signals are transmitted on the receiving side. One unit of image is converted into a continuous monitorable image signal via memory means.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a multi-point surveillance camera system according to an embodiment of the present invention. As shown in the figure, TV cameras 11, 12, and 13 have terminal lines 2 corresponding to them.
1, 22, and 23 are connected, and the line switching section 31°32.3
3 to the transmission line 50.

As for the configuration of the transmitting unit, first, a synchronization separator 41 separates the synchronization signal of the video signal coming from the camera and sends it to the genlock circuit 4 together with the reference signal coming from the control signal generator 41.
3. The genlock circuit 43 synchronizes the phase of the synchronization signal separated from the video signal with the reference signal coming from the control signal generator 41 to synchronize the camera and the control signal generator 4.
The synchronization of the reference signal coming from 1 is completely locked.

The matrix switch 46 for selecting the line switching sections 31, 32, 33 is controlled by sending a switching pulse from the microcomputer 47 every field or frame.

TV camera 11 for each field or frame,
12. Identification addition switch 45 that adds an identification signal for identifying the television camera when 13 is switched.
There is. The switching of the switch 45 and the addition of the identification signal are controlled by the identification signal generator 44. Thus,
The video signals of the television cameras 11, 12, and 13 are switched in units of 1 field or 1 frame, and the transmission line 50
, each video signal has already been identified.

Next, a description of the receiving unit 60 will be given.

When the signal reaches the receiving unit 60 from the transmission line 50, the identification signal discriminating circuit 6 is first used to input the video signal output from each television camera to each monitor.
1, it is determined which television camera the image is from, and the information is sent to the CPU 62, which switches the matrix switch 63. Then, each video signal enters each line, and the video signal is A/D converted by A/D converters 64, 65, and 66.

Thereafter, memories 610, 611, and 612 are set as memories for recalling and writing memory contents via memory controllers 67, 68, and 69.

The contents read from memories 610, 611, 612 are controlled by memory controllers 67, 68, 69, D/A converted by D/A converters 613, 614, 615, and output to the monitor.

Next, referring to Figure 2 (1) and Figure 2 (2),
Identification signal generation additional device 44 in the transmitting unit 40
The detailed configuration and operating procedures are explained below.

The identification signal generation/addition device shown in FIG. 2 (1) converts the first few horizontal video signals from the vertical synchronization signal of the video signal into bits, converts the luminance signal 10n into bits, and converts the luminance signal level 10n into bits and the luminance signal level 0 into "0". ”, the television camera signal can be identified by the combination of t and o.

That is, (1) An arbitrary horizontal video line is used from the vertical synchronization signal of the video signal, and encoding is performed using the luminance information of the horizontal video signal.

■Suppose that the luminance signal 100 is "1" and the luminance signal O1 is "0".
”, using the first 4 horizontal video lines from the end of the vertical synchronization signal (equivalent pulse), these 1”, 0”
Add information.

In FIG. 2(1), first, a signal synchronized with the television camera is sent from the control signal generator 1, counted by the counter 2, and this information is input to the CPU 3. CPU
3 stores identification information in several bits in advance, and switches 5. As described above, the switching timing of this switch 5 is changed at the first few horizontal video signals from the vertical synchronizing signal.

The CPU 3 returns the video/identification signal switch to the original video line when the first few horizontal video signals for adding the identification signal are completed.

Next, the time chart shown in FIG. 2 (2) will be explained. The illustrated Sl is a composite sync signal (decoding synchronization signal), and this signal is synchronized with the video signal.

Sl is a video signal, and S3 is an identification signal. S4 is a horizontal blanking signal, and when this signal is "L", the video/identification changeover switch 4 is switched to the identification signal side, and when it is "H", it is switched to the video signal side. Then, at the stage where the first few horizontal video signals have finished after the vertical synchronization signal, the switching signal S
5 switches from "L" to "H", the horizontal blanking signal S4 remains at "H", and returns to the normal video signal line. In this way, a signal S6 which is an identification signal and a video signal is obtained.

This allows the video signal from the television camera to be identified.

FIG. 3 shows the signal waveform on the transmission line. As shown in the figure, on the transmission line, signals from a television camera are continuously transmitted, which are switched for each field or frame.

[Effects of the Invention] As described above, according to the present invention, when a large number of monitoring points are monitored at a remote center, it is not necessary to install a transmission line corresponding to each television camera installed at each monitoring point. Therefore, even when monitoring a remote location or wide area, it is possible to significantly reduce the cost and man-hours of laying a transmission line, and it is possible to realize an economical system.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a multi-point surveillance camera system according to an embodiment of the present invention, Fig. 2 (1) is a detailed block diagram of an identification signal generation additional device, and Fig. 2 (2) is an identification signal generation device. 3 is a signal waveform diagram on the transmission line, and FIG. 4 is a block diagram of a conventionally known multi-point surveillance camera. 11.12.13...TV camera, 21.22.2
3... Terminal line, 31.32.33... Line switching section, 40... Transmission unit, 41... Synchronization separation section, 42... Control signal generation section, 43... Genrotsuta circuit, 44... Identification signal generation addition device, 45... Identification addition switch, 46... Matrix switch, 47... Microcomputer, 50... Transmission line, 60... Receiving unit, 61... Identification signal discrimination circuit, 62...CPU. 63... Matrix switch, 64.65.66... A/D converter, 67.68.6
9...Memory controller, 610, fill, 61
2...Memory, 613.614,615...D/^
Converter, 616, 617, 618...Monitor television. Fig. 4 is a 70-trick diagram showing the multi-point monitoring device of the 1E Song Dynasty.

Claims (1)

[Claims] 1) A television camera installed at a plurality of monitoring points, a transmission line for transmitting an identification signal for identifying the television camera and an image signal from the television camera, and from the transmission line. 1. A multi-point monitoring device comprising: memory means for storing the image signal of a corresponding television camera based on the identification signal of the television camera and transmitting the image signal as a continuous image signal.