JPS62230186A - Automatic image switching device - Google Patents

Abstract

PURPOSE:To eliminate necessity of an image distributor by driving plural automatic image switching circuits by one timing pulse generating circuit and supplying video signals from plural cameras to automatic image switching circuits in parallel. CONSTITUTION:It is supposed that a remote controlling device is operated in a monitor NO.1 side, and commanded to fix a projected image to the image of a camera NO.2. Thereby, a selection signal is inputted to a switching circuitNo.1 from a signal line corresponding to the camera NO.2 out of selection signal input lines of the monitor NO.1 system. The switching circuit NO.1 stops image switching of the camera so far made automatically temporarily, and outputs video signals from the camera NO.2 to an output signal line 6 to the monitor NO.1 system at all times. Accordingly, the image of the monitor NO.1 is fixed to the image projected by the camera NO.2. On the other hand, in the switching circuit NO.2, automatic switching of image is made by a pulse from a timing pulse generating generating circuit 3 regardless of operation of the switching circuit NO.1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an automatic video switching device for a surveillance television camera system, and more specifically, for a surveillance television camera system equipped with several cameras, which monitors at two or more locations. The present invention relates to an automatic video switching device suitable for application in various cases.

[Background of the Invention] Conventionally, in a surveillance television camera system in which several television cameras are installed at desired locations for monitoring, there are cases in which it is desired to monitor images projected by the television cameras at two or more locations. Ta.

FIG. 2 shows a schematic configuration of a surveillance television camera system used in such cases.

In the figure, 11 is a television camera installed at a place desired to be monitored. This television camera 11 is given a number and is called camera No. 1 to No. n, respectively. 1
2 is an automatic video switch, 13 is a video distributor, 14 is a monitor television, and 15 is a remote controller. monitor tv 1
4 and the remote controller 15 are provided in two sets for each location to be monitored, and numbers are assigned to each set and stored.

In the above configuration, monitoring of the image of the camera 11 is performed as follows. First, the images of several cameras 11 are sequentially switched at predetermined intervals by an automatic video switching device 12, and the output thereof is sent to a monitor television 14 installed at a location desired to be monitored by a video distributor 13.

If the user wants to view a fixed image of a certain camera 11 on the monitor side, the user operates the remote controller 15 to select that camera. As a result, the selection signal from the remote controller 15 is input to the external control input terminal of the automatic video switching device 12, and the video on the monitor is fixed to the video of the selected camera. This selection is made using the remote controller 15.
By connecting them in parallel, it is possible to operate from any remote controller, that is, from any monitor.

However, the conventional system as described above has the following problems.

(1) For example, in the system shown in Figure 2, if you operate the remote controller No. 1 on the side of the monitor TV No. 1 and fix the image displayed on the monitor to a certain camera, the image displayed on the monitor TV No. 2 Even if you do not want to fix it on the side, you will be forcibly fixed on the image. Conversely, the same applies when the operation to fix the image is performed on the monitor TV No. 2 side.

(2) The automatic video switching device equipped with an external control input terminal used in the above system must be equipped with a video skipping switch, manual selection switch, switching time adjustment knob, fixed monitor selection function, etc. There are a lot of them and they are expensive.

(3) Automatic video switching devices often have one switching circuit and one switching output, so there are two monitoring locations.
If there are more than one location, a video distributor is required in addition to an automatic video switcher.

[Object of the Invention] In view of the above-mentioned problems of the conventional method, the object of the present invention is to apply it to a surveillance television camera system, etc., even when an image displayed on a certain monitor is fixed to a certain camera. To provide an automatic video switching device that does not affect other monitors and does not require a video distribution device.

[Structure of the Invention] In order to achieve the above object, the automatic video switching device of the present invention includes a plurality of automatic video switching circuits that automatically switch and output video signals input in parallel from a plurality of cameras; The present invention is characterized in that it includes one timing pulse generation circuit that generates pulses for driving a plurality of automatic video switching circuits.

That is, the present invention includes a plurality of automatic video switching circuits that automatically switch and output video signals from a plurality of cameras,
The automatic video switching circuit is characterized in that the plurality of automatic video switching circuits are driven by one timing pulse generation circuit, and video signals from the plurality of cameras are supplied to the automatic video switching circuit in parallel.

This provides an automatic video switching device that is inexpensive and does not require a video distributor.

Furthermore, in one aspect of the present invention, the automatic video switching circuit stops the automatic switching operation in response to an external signal, and fixes the output of the signal from the camera specified in response to the external signal. According to this, even if the image is fixed on one monitor, other monitors are not affected.

[Explanation of Examples] Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 shows the configuration of an automatic video switching device according to an embodiment of the present invention.

In the same figure, 1 is the switching circuit NO, and 1 and 2 are the switching circuit N.
002.3 is a timing pulse generation circuit, and 4 is a signal line from a television camera. There are 0 signal lines 4 from cameras No. 1 to No. n corresponding to the n cameras. Further, 5 is a selection signal input line for inputting a selection signal for specifying a camera for fixing an image for each of the plurality of monitor systems, and 6 is an output signal line for each TV. In this embodiment, the monitor has two systems, and a selection signal input line 5 and an output signal line 6 are provided for each system. Further, the selection signal [15] for one monitor system is made up of a bundle of n trees corresponding to n cameras.

In the above configuration, the switching circuit N 0.1 inputs the pulse generated from the timing pulse generation circuit 3, and according to the pulse, switches the cameras N 0.1 to NO.

Monitor N by automatically switching the images of N in sequence at predetermined intervals.
Output to O31 system. The same applies to switching circuit No.2.

Here, for example, assume that a remote controller is operated on the side of the monitor N001 to instruct to fix the image to be displayed on the image of the camera N002. This allows monitor N08
Switching circuit No. from the signal line corresponding to camera No. 2 out of one selection signal input $15.

A selection signal is input to 1. In response to this signal, the switching circuit N001 temporarily suspends the automatic video switching of the camera and constantly outputs the video signal from the camera No. 12 to the output signal line 6 to the monitor N001 system, so the video on the monitor N081 is Fixed to the image projected by camera N092.

On the other hand, in the switching circuit N092, the switching circuit N011
Automatic video switching is performed by pulses from the timing pulse generating circuit 3 regardless of the operation of the timing pulse generating circuit 3.

According to this embodiment, there is no need for a video distributor, which was required in the past. Further, the circuit configuration can be realized with a simple one and is inexpensive.

[Effects of the Invention] As explained above, according to the present invention, an automatic video switching device applied to a surveillance television camera system, etc. is provided with a plurality of automatic video switching circuits, and the automatic video switching circuit is provided with a plurality of automatic video switching circuits, and Switching operations are performed independently, and video signals from multiple cameras are supplied in parallel to this automatic video switching circuit, so even if the video is fixed to a certain camera on one monitor, the video signals from multiple cameras will not be transmitted to other monitors. This has the advantage that it has no effect on the image quality, is inexpensive, and eliminates the need for a video distributor.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an automatic video switching device according to an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a conventional surveillance television camera system. 1.2...Switching circuit, 3...Timing pulse generation circuit, 4...TV camera input signal line, 5...Video selection signal input line, 6...Output signal line.

Claims (1)

[Claims] 1. A plurality of automatic video switching circuits that automatically switch and output video signals input in parallel from a plurality of cameras, and generate pulses to drive the multiple automatic video switching circuits. 1. An automatic video switching device characterized by comprising one timing pulse generation circuit. 2. The automatic video switching circuit according to claim 1, wherein the automatic video switching circuit stops the automatic switching operation in response to an external signal, and fixes and outputs the video signal from the camera specified by the external signal. Video switch.