JP2962833B2 - Fire detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector using a television camera (ITV), and more particularly to a fire detector used in conjunction with a water cannon for extinguishing a fire when a fire occurs. is there.

[0002]

2. Description of the Related Art For example, in a water discharge gun extinguishing system linked to a television (ITV) camera, a television (ITV) camera equipped with a water discharge cannon and a zoom lens used in conjunction with the water discharge cannon. Is provided in a fire monitoring area, and a video signal from an ITV camera is displayed on a display device such as a television screen installed at a center or the like, and the fire monitoring area is monitored. When a target, that is, a fire source is confirmed by the ITV camera due to the occurrence of a fire, the azimuth and distance to the fire source are measured.
First, the target is captured by the ITV camera with the shooting sight, that is, the target is captured at the center of the ITV camera. Then, the cursor written directly on, for example, a cathode ray tube of a television is set to the fire source or the target. Zoom up.
When the position of the target is measured through such a process, the water cannon is discharged toward the fire source to extinguish the fire.

In such an interlocking water cannon fire extinguishing device, a plurality of ITV cameras are provided in a fire monitoring area, and image signals from the plurality of ITV cameras are transmitted to one TV screen or the like installed at a center or the like. It may be advantageous to switch to a display device for monitoring.

In the case where a plurality of ITV cameras are switched and displayed as described above, when one ITV camera is switched to another ITV camera, a shift of a unique camera center of each camera causes a TV screen to be displayed. The center is shifted, which also shifts the center of the cursor written directly on the television screen. Therefore, ITV
Each time the camera is switched, it is necessary to re-center the cursor on the camera center.

[0005] This is achieved by using two I
The case of the TV cameras (A) and (B) will be described in more detail with reference to FIG. First, as shown on the left side of FIG. 3, the cursor is positioned on the center of the ITV camera (A) to clarify the position of the center of the camera. Next, when switching to the ITV camera (B), the center of the TV screen is set to the
It is not the same as the camera center of the camera (A). Therefore, as shown on the right side of FIG. 3, the cursor positioned at the camera center of the ITV camera (A) is shifted from the camera center of the ITV camera (B). If the ITV camera (B) is zoomed up with this displacement, the center of the ITV camera (B) will be displaced from the television screen, so that the ITV camera (B) cannot accurately measure the position of the target.

[0006]

Therefore, according to the present invention, an image signal from one of a plurality of television cameras equipped with a zoom lens is switched and selected by a camera selection device and displayed on a display device. In a fire detection device for detecting and monitoring a fire spot, a cursor synthesis device for synthesizing a cursor to be displayed on the display device together with the image signal selected by the camera selection device, wherein the plurality of televisions The cursor synthesizing device which stores the position of the center of each camera of the John camera, and the camera selecting device and the cursor synthesizing device which are controlled when the television camera is switched, and which is stored in the cursor synthesizing device. Using the cursor corresponding to the position of the camera center, move the cursor to the camera center of the switched television camera. A control unit for setting control, the fire detection apparatus having a are provided. Such a television or industrial television is particularly suitable for use in conjunction with a water cannon.

[0007]

A cursor synthesizing device is added to the camera selection device of the ITV camera, the position of the camera center unique to each camera is stored, and the shift between the camera center and the cursor that occurs when the camera is switched is controlled by the control unit. I try to get rid of them automatically. Thus, it is not necessary to adjust the cursor each time the camera is switched. Also,
Such a television is suitable for use as a fire detection device in an ITV camera-linked water cannon fire extinguishing device, for example, which has no time to perform cursor alignment due to urgency.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings, taking an ITV camera-linked water cannon fire extinguishing device as an example.

FIG. 1 shows an ITV apparatus provided with a plurality of ITV cameras according to an embodiment of the present invention, which is used in, for example, a water cannon apparatus (not shown).
In this embodiment, the first ITV camera 10A is used as a camera.
The following describes a case where two ITV cameras of the second ITV camera 10B are installed in the monitoring area. A camera selection device 16 and a cursor composition device 18 are connected between the ITV cameras 10A and 10B and the television 14, and these devices 16 and 18 are connected to the camera selection device 16 and the cursor composition device 18. Control unit 2 for controlling
0 is connected.

[0010] The camera selecting device 16 responds to a command signal from the control unit 20 provided across the line 20a.
Either the image signal from the first ITV camera 10A on a or the image signal from the second ITV camera 10B on the line 10b passes through the line 16a.

A cursor synthesizing device 18 for synthesizing a cursor to be superimposed on an image signal passing over the line 16a measures a unique camera center position of each ITV camera in advance for each ITV camera. Is remembered. Therefore, in the cursor synthesizing device 18, the line 20
In accordance with a command signal from the control unit 20 given over the line b, control is performed to shift the cursor superimposed on the image signal on the line 16a to a position corresponding to the first or second ITV camera.

With the above configuration, it is assumed that a fire source is found while monitoring the monitoring area with the first ITV camera 10A, for example. To measure the azimuth and distance to the fire source, first capture the fire source with an ITV camera, then
By moving the V camera, the cursor on the television screen is zoomed up in accordance with the fire source or fire extinguishing target. Through such a process, the fire source is accurately captured at the cursor position, and the rotation angle, the elevation angle, the zoom ratio, and the like of the first ITV camera 10A are detected by a measuring unit (not shown), and the position of the fire source is measured. Then, the water cannon is fired at the fire source, and the fire is extinguished.

Now, it is necessary to switch the image signal to the television screen from that of the ITV camera 10A to that of the ITV camera 10B for some reason, such as observing from the side to know the actual reach of the water discharge by the water cannon. Is generated.

Assuming that the operator operates a switch, for example, on a console (not shown) connected to the control unit 20 to perform the switching, the control unit 20
Upon receiving the switch signal, the second ITV camera 10B
To the line 20a.
On and 20b.

In response to the command signal on the line 20a, the camera selecting device 16 selects the line 1 from the first ITV camera 10A.
0a, the second ITV camera 10B
The image signal on line 10b from is passed to line 16a.

In the cursor synthesizing device 18, the line 20
b, the cursor set at a position corresponding to the center of the second ITV camera is superimposed on the image signal on the line 16a from the second ITV camera 10B, and a line 18 is received.
a, and thus the second ITV camera image signal on the line 18a on which the cursor is superimposed is
Will be displayed.

The image displayed on the television screen 14 in this manner is switched from the one by the first ITV camera 10A to the one by the second ITV camera 10B, and the cursor displayed therewith is also the one shown in FIG. As shown in (2), since it is automatically shifted corresponding to the center of the switched second ITV camera 10B, there is no need to perform the cursor adjustment to the center of the camera again.

[0018]

As described above, according to the present invention, a plurality of ITVs
When monitoring the surveillance area using a camera, the ITV
A camera selecting device and a cursor synthesizing device are provided between the camera and the television image, and when the ITV camera is switched by a command signal generated from the control unit in accordance with an operation of an operator, an image signal from the switched ITV camera is output. Together, each ITV stored in the cursor synthesizer
Since the cursor with the position of the camera center is also displayed on the TV screen, if the cursor is first aligned with the camera center, then it is necessary to re-center the cursor even if the ITV camera is switched. There is no effect.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a fire detection device according to one embodiment of the present invention.

FIG. 2 is a diagram illustrating a cursor position on a television screen when an ITV camera is switched using the present invention.

FIG. 3 is a diagram illustrating a cursor position on a conventional general television screen when camera switching is performed.

[Explanation of symbols]

 10A First ITV camera 10B Second ITV camera 14 Display device (television) 16 Camera selection device 18 Cursor synthesis device 20 Control unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-167199 (JP, A) JP-A-62-286197 (JP, A) JP-A 60-184189 (JP, U) JP-A 61-186189 80060 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B08B 17/00 H04N 7/18

Claims (2)

(57) [Claims] 1. A fire detection device for switching and selecting an image signal from one of a plurality of television cameras equipped with a zoom lens by a camera selection device, displaying the selected image signal on a display device, and detecting or monitoring a fire point, A cursor synthesizing device for synthesizing a cursor to be displayed on the display device together with the image signal selected by the camera selecting device, wherein a position of a center of each of the plurality of television cameras is stored. When switching between the cursor synthesizing apparatus and the television camera, the camera synthesizing apparatus and the cursor synthesizing apparatus are controlled, and switching is performed using an apparatus corresponding to the position of the camera center stored in the cursor synthesizing apparatus. A control unit for setting and controlling the cursor at the camera center of the television camera. Place. 2. The fire detection device according to claim 1, wherein the plurality of television cameras are used in conjunction with a water cannon.