JPH0822586A - Multipoint monitoring system - Google Patents

Abstract

PURPOSE:To enable the simultaneous monitoring of multipoint by one monitor and to simplify the facility. CONSTITUTION:Each monitoring position is photographed by TV cameras 11 to 1N. The photographing picture signal of each TV camera is switched and is taken out to a multiplexer 3. The photographing picture signal taken out from the multiplexer is bit-developed and stored in a frame memory 7 by performing encoding by a picture encoder 4 and decoding by a picture decoder 6. In a monitor 8, the picture signal by TV cameras is divided into plural screens by TV camera positions at the display. Thus, the selection of the picture specified for plural pictures displayed on the monitor by a monitoring controller 9, the expansion and reduction and the valid/invalid processing of the display are enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multipoint monitoring system for displaying a photographed image of a multipoint in a building or a premises on a monitor to perform a monitoring operation.

[0002]

2. Description of the Related Art As this type of system, there is an ITV system for monitoring a remote place with its image. This ITV
The system installs TV cameras at each monitoring position, transmits the TV signals from each TV camera to the monitoring center with a dedicated cable, displays the received TV signals on the monitor on the center side, and monitors the images by the monitor. I do.

Image display by a monitor is a system in which images from a large number of television cameras are switched and displayed on a single monitor.
Alternatively, there is a method of displaying images from each TV camera on their own monitors.

Further, the camera is a fixed system in which the shooting direction and the shooting screen are fixed, and a TV camera is installed on the pan head and the pan head is controlled remotely by a switch or a joystick on the monitoring center side. There is a remote control system that performs zooming control.

Further, in addition to the photographing by the camera, a sensor (infrared sensor, magnetic sensor, image sensor, etc.) for detecting abnormality of the object to be monitored or intrusion of a person is provided at the monitoring position, and the abnormality detection signal by these sensors is monitored. There is also a system configuration in which an alarm is sent to a monitoring person by transmitting it to the center.

[0006]

In the conventional system, the monitoring by one monitor cannot simultaneously monitor multiple points.

In this respect, in monitoring by a large number of monitors,
Although simultaneous monitoring is possible, a large number of monitors and transmission lines are required, which increases the cost of equipment.

An object of the present invention is to provide a multipoint monitoring system which enables simultaneous monitoring of multiple points by one monitor and simplifies equipment.

[0009]

In order to solve the above-mentioned problems, the present invention provides a plurality of television cameras arranged at a plurality of locations for monitoring and photographing at each location, and a multiplexer for picking up and picking up a photographed image signal of each television camera. , A transmission means for encoding the captured image signal taken out from the multiplexer, transmitting it to the monitoring room side for decoding, a frame memory for bit-decompressing and storing the decoded image signal, and an image for each television camera read from the frame memory One monitor that can display the signal by dividing the screen into multiple screens according to the TV camera position, and the selection and enlargement / reduction of the images specified for the multiple images displayed on this monitor and the processing of enabling / disabling the display. And a monitoring control device for performing the above.

[0010]

By displaying images from a large number of TV cameras on one monitor in a divided manner, simultaneous monitoring by one TV camera is possible.

The transmission means is simplified by taking in images from each television camera by a multiplexer in a time-division manner and transmitting them to one side using a single line.

The size of each image displayed on the monitor can be changed by the monitor control circuit so that the monitor function equivalent to the system in which the TV camera and the monitor are in a one-to-one correspondence can be obtained in the enlarged display of the image of interest. .

[0013]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

[0014] Each monitored location, N stage of the television camera 1 ₁ to 1 _N to obtain a captured image signal is installed.

Each image signal taken by each of the cameras 1 ₁ to 1 _N is converted into an analog or digital signal, and a multiplexer 3 installed at a relay position through a transmission device 2 ₁ to 2 _N which becomes a public line or a dedicated line. Is taken into.

The multiplexer 3 switches and extracts each image signal by time division, and adds shooting position information such as the number of the television camera corresponding to each image signal to this extraction.

The image encoding device 4 encodes the image signal from the multiplexer 3 by compressing the still image. This coded image signal is transmitted by the transmission device 5 that becomes a public line or a dedicated line.
Is transmitted to the monitoring room side.

The image decoding device 6 decompresses the coded image signal from the transmission device 5 and writes it in the frame memory 7 as an image.

Writing to the frame memory 7 is switched sequentially or in accordance with the priority order according to the photographing position information added by the multiplexer 3.

The single monitor 8 has a screen-divided image display function, and displays the image from the frame memory 7 in a reduced size in each screen-divided area.

Writing and reduction control to the frame memory 6 is performed by the monitor control device 9. Further, the monitor control device 9 arbitrarily switches and controls the television camera image selected by the multiplexer 3 by the control signal transmitted through the control line 5A of the transmission device 5, that is, changes the priority order of captured image information collection.

The monitor control device 9 is provided with a console 10 as an image display control means and a mouse 11 as a pointing device, and selects an arbitrary image using the cursor 8A displayed on the monitor 8 to select the selected image. Can be enlarged or reduced to an arbitrary size, and the display can be enabled or disabled.

When the display is invalid, the information is transmitted to the multiplexer 3 side, and the disabled camera image is excluded from the image switching selection (switching display).

According to the present embodiment, a large number of captured images from a large number of television cameras 1 ₁ to 1 _N are sequentially / priority / arbitrarily switched by the multiplexer 3, and the image encoding device 4 and the transmission device 5 are used. Also, the data is transmitted to the monitoring room side through the image decoding device 6, bit-developed and stored as frame data in the frame memory 7, and the screens of one monitor 8 are divided into areas and simultaneously displayed. Therefore, one monitor can monitor multiple points at the same time.

The monitoring image of interest is displayed on the screen of the monitor 8 in an enlarged manner by selecting and enlarging it using the console 10 or the mouse 11, and is equivalent to a system in which the television camera and the monitor are monitored on a one-to-one basis. In addition, a clear image display and visual confirmation can be made in every detail. Note that other images can be simultaneously displayed as a reduced image according to the degree of attention, or by performing multi-window display, the same function as simultaneous monitoring can be secured.

Further, each image signal is transmitted by a time division method, and the construction of the system can be simplified by a set of image encoding devices and transmission devices.

It should be noted that in the embodiment, the monitoring function can be further improved by adding a function of controlling the photographing direction and zoom of each television camera from the monitoring control device 9 side and further detecting an abnormality.

[0028]

As described above, according to the present invention, the image signals taken by the television cameras provided at the respective monitoring points are taken out as time-division signals by the multiplexer, and the signals are transmitted to the monitoring room side by the transmission device, and the television cameras are separated. The image signal of is divided into a plurality of screens according to the position of the TV camera and displayed on one monitor, and the selection and enlargement / reduction of the image specified for the multiple images displayed on the monitor and the display of the valid / invalid of the display are performed. Since it is a system that performs processing, it has the following effects.

(1) Images from many TV cameras
Since it is divided and displayed on one monitor, simultaneous monitoring can be performed by one TV camera.

(2) The image from each television camera is time-divided by the multiplexer and transmitted to the monitoring room side using one line, so that the transmission means is simplified.

(3) Since the size of each image displayed on the monitor can be changed by the monitoring control circuit, a monitoring function equivalent to the system in which the TV camera and the monitor are in a one-to-one correspondence with the enlarged display of the image of interest is provided. can get.

[Brief description of drawings]

FIG. 1 is a block diagram of a multipoint monitoring system showing an embodiment of the present invention.

[Explanation of symbols]

1 ₁ 1 _N ... Television camera 3 ... Multiplexer 4 ... Image coding device 6 ... Image decoding device 7 ... Frame memory 8 ... Monitor 9 ... Monitoring control device 10 ... Console

Claims (1)

[Claims] 1. A plurality of television cameras arranged at a plurality of locations for monitoring and photographing at each location, a multiplexer for switching and capturing the captured image signals of each television camera, and a monitoring room side by encoding the captured image signals retrieved from the multiplexer. And a frame memory for bit-decompressing and storing the decoded image signal, and an image signal for each TV camera read from the frame memory can be displayed by dividing the screen into a plurality of screens for each TV camera position. 1
A single monitor and the selection, scaling, and display of images specified for multiple images displayed on this monitor.
A multipoint monitoring system, comprising: a monitoring control device that performs invalidation processing.