JPH04245598A - Fire source position measuring unit using television camera - Google Patents

Abstract

PURPOSE:To rapidly execute fire source position measuring the turning speed of a television camera in plural stages or in non-stage based on the angular difference between the present bearings of a fire source positional information and the television camera. CONSTITUTION:When it is completed that a fire source F is brought to the center of the picture of a television TV, what is called sight adjustment, a control part 2 detects the angle of elevation and the rotational angle of an industrial television(ITV) camera from the detecting circuit of a camera turning device, a positional discriminating part is made to operate the positional coordinates of a fire point or the like based on the rotational angle and the angle of elevation and a fire source position is measured. That is, the angle between the direction of the ITV camera and the position of the installing place of a fire sensor LS to be an object and a reference angle R are compared and the turning speed of the ITV camera is made changed corresponding to the result of it. Thus, the fire source F position can be measured rapidly.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire source position measuring device using a television camera.

0002

2. Description of the Related Art A fire source location measuring device using an industrial television (ITV) camera has been considered as one of the disaster prevention systems for large spaces. For example, when a fire detector such as a separate smoke detector is activated and the control unit of the fire source position measuring device receives a fire signal from the fire detector, the control unit rotates the ITV camera. This is a disaster prevention system that confirms the source of a fire while displaying it on a television.

0003

[Problems to be solved by the invention] IT in large spaces
In a fire source position measuring device using a V camera, as mentioned above, after the control unit of the fire source position measuring device receives a fire signal from a fire detector, the ITV camera is rotated to confirm the fire source. In the past, since the rotation speed of the ITV camera was constant, there was a problem in that it took too much time to confirm the location of the fire source. In other words, if the angle from the camera's localization to the fire source position direction is large, it takes a long time to turn (90 degrees
30 seconds to turn), there is a risk that measurement of the fire source location will be delayed.

0004

[Means for Solving the Problems] Therefore, according to the present invention, in an apparatus for measuring a fire source position using a television camera rotated by a camera rotation device, a method for obtaining fire source position information is provided. a fire source position information acquisition means; and a fire source position information acquisition means for rotating the television camera in the direction of the fire source position based on the fire source position information obtained by the fire source position information acquisition means; a control unit that sends a rotation control signal to the camera rotation device to change the rotation speed of the television camera based on the angular difference between the fire source position information and the current orientation of the television camera; A fire source position measuring device is provided.

[0005]

[Operation] In a fire source position measuring device using a television camera, the turning speed of the television camera is changed based on the angular difference between the fire source position information and the current orientation of the television camera. The manner in which this turning speed changes is
It can be switched in multiple stages based on the angle difference, or it can be made stepless, allowing the camera to rotate at a fast speed from the camera's localization to an angle near the fire source location direction, and at a slow speed at the fire source direction angle. It is possible to confirm. In this way, by varying the turning speed of the television camera in multiple steps or steplessly, the turning time from localization to the fire source can be shortened, making it possible to measure the fire source location faster than before. can. Note that the television camera can be rotated both automatically and manually.

[0006]

[Embodiments] Hereinafter, embodiments of the present invention will be explained with reference to the drawings. FIG. 1 is a block circuit diagram showing an example of a fire source position measuring device to which the present invention can be applied.
ITV camera for monitoring the object to be extinguished (not shown) and for measuring the location of the fire source, 1a, installed on top of the object (not shown), etc.
is a camera rotation device that has a rotation mechanism that rotates or rotates the ITV camera 1 left, right, up and down under the control of a rotation signal, and the rotation angle and elevation angle of the ITV camera 1 are detected by a potentiometer, a rotary encoder, etc. It also has a detection circuit that outputs these signals.

Reference numeral 2 denotes a control unit installed in a central control center (not shown) for controlling the rotation of the ITV camera 1, and it collects positional information (from the localization of the ITV camera 1) of the installation location of each fire detector LS. To detect the rotation angle and elevation angle of the ITV camera 1 from a memory storing information such as the angle and distance of the camera rotation device 1a and the detection circuit of the camera rotation device 1a, calculate the position coordinates of the fire spot, etc., and obtain the position signal. and a position determination unit. TV is a television receiver that receives images from the ITV camera 1, and 3 is a joystick used when manually operating the ITV camera 1.

[0008] Note that a plurality of fire detectors LS that report fire occurrence information and a memory that stores location information of the installation location of each fire detector LS constitute an example of a fire source location information acquisition means. The means for acquiring fire source position information may be a device such as a manual alarm device or an emergency telephone, for example, instead of a fire detector that reports fire occurrence information. Information regarding the installation location of each device such as emergency telephones will be stored. Further, information on the area (location) where the fire occurred may be received from the fire receiver.

The operation will be explained below with reference to FIGS. 2 and 3. Figure 2 shows the fire detector that caught the fire source F among the plurality of fire detectors LS, and the direction of the fire detector LS.
It is a diagram showing where the TV camera 1 is facing, and the IT
The V camera 1 is viewed from above so that the angle of movement from the normal position can be seen. Further, FIG. 3 is a flowchart for explaining the operation.

When a fire occurs in a large space, as shown by F in FIG. A fire signal is sent to the control section 2 of the device.

[0011]

[For automatic control] When the control unit 2 receives a fire signal (
Y) in block 102, the control unit 2 automatically rotates the ITV camera 1 toward the direction of the fire sensor LS that detected the fire, that is, the direction of the fire source F. That is, when the control unit 2 receives a fire signal, the control unit 2 causes the fire sensor LS that transmitted the fire signal to
The position information (in particular, the angle from the localization of the ITV camera 1) corresponding to P1 is read out from the memory (step 104),
Next, the ITV camera 1 is connected to the detection circuit of the camera rotation device 1a.
The rotation angle P2 is received (step 106), and the two are compared (step 108).

As a result of comparison, the difference between both angles (P1-P2)
is larger than the reference angle R (N in step 110)
, the control unit 2 moves the ITV camera 1 to the fire source F at a relatively fast first speed V1 based on the position information read from the memory.
A first rotation signal is output to the rotation mechanism of the camera rotation device 1a in order to turn or rotate the camera in the direction of (step 112).

[0013] As a result, the ITV camera 1 is turned or rotated in the direction of the fire source F at the first speed V1, but the control unit 2 continues to adjust the rotation angle P2 of the ITV camera 1 to the direction of the fire source F using the camera rotation device. It continues receiving from the detection circuit 1a (step 106) and compares it with the angle P1 (step 108).
, when the comparison result shows that the difference (P1-P2) between both angles is equal to or less than the reference angle R (Y in step 110), the control unit 2 then moves the ITV camera 1 to the fire source at a relatively slow second speed V2. A second rotation signal is output to the rotation mechanism of the camera rotation device 1a in order to turn or rotate the camera in the direction F (step 114).

[0014] As a result, the ITV camera 1 is turned or rotated in the direction of the fire source F at the second speed V2, and then when the angle P1=P2 (Y in step 116).
, the rotation or rotation of the camera rotation device 1a is stopped (
Step 118), then a so-called aiming is performed to bring the fire source F to the center of the television image (step 120).

When the aiming is completed, the control section 2 next detects the rotation angle and elevation angle of the ITV camera 1 from the detection circuit of the camera rotation device 1a, and sends the information to the position determination section based on these rotation angle and elevation angle. Calculate the location coordinates of the fire spot, etc.
In this way, the fire source position is measured.

As described above, according to the present invention, when the angle between the direction of the ITV camera 1 and the location of the target fire detector LS is larger than the reference angle R, the ITV camera 1 rotates or rotates quickly. When the angle between the two becomes less than the reference angle R, the fire detector is slowly turned or rotated to the angle at which the fire detector is installed, so the time required to direct the ITV camera 1 to the target position can be reduced. An example of the time required for turning or rotating is shown below.

Assume that the angle between the localization of the ITV camera 1 and the fire source F is initially P1-P2=90°, and R=10.
°, V1=6°/sec, V2=3°/sec, |P
The time required for 1-P2| to turn 80 degrees from 90 degrees to 10 degrees, that is, if |P1-P2|>R=10, (90-10)/6=13 (seconds) The remaining 10 The time required to turn °, i.e. |P1-P
In the case of 2|≦R, 10/3=3 (seconds) Therefore, the time required for a 90° turn is 13 seconds + 3 seconds = 16 seconds. Conventionally, the turning speed was uniformly 3°/second, so the required time was 90°/3°=30 seconds.Therefore, according to the present invention, the turning speed was twice the conventional speed. It is possible to shorten the time required to discover the location of the fire source.

When aligning the target position with the center of the screen, that is, when aiming, it is necessary to extremely reduce the turning speed to prevent overrun (
For example, 0.5°/sec, etc.).

[0019]

[For manual control] For manual control, ITV camera 1
The joystick 3 is operated while watching the monitor, that is, the television. The control unit 2 receives a signal from the joystick 3 and turns or rotates the ITV camera 1 in the direction in which the joystick 3 is operated.
A rotation control signal that increases the rotation speed of the camera is applied to the rotation mechanism of the camera rotation device 1a. Alternatively, when the joystick 3 is operated, the control unit 2 controls (P1-P2) as described above, regardless of the tilt of the joystick 3.
The turning speed may be automatically changed depending on whether the magnitude of the reference angle R is larger or smaller than the reference angle R.

[0020] In the above embodiment, a case was shown in which the turning or rotating speed was changed in two steps, 6°/sec and 3°/sec, but this was changed depending on the direction of the ITV camera and the object. Of course, it is possible to perform more fine control by changing the angle in multiple steps or in a stepless manner in proportion to the momentary opening of the angle.

[0021]

[Effects of the Invention] As described above, according to the present invention, the television
In a fire source position measuring device using a camera, the turning speed of the television camera is changed in multiple steps or steplessly based on the angular difference between the fire source position information and the current orientation of the television camera. Therefore, the camera is rotated at high speed from the orientation of the target fire detector to the angle near the fire source location direction, and when it approaches the fire source location, it is rotated slowly to the direction of the target fire detector to detect the fire. The fire source can be confirmed, and therefore, the time required to rotate or rotate the camera can be shortened, and the fire source position can be measured quickly.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing an example of a fire source position measuring device to which the present invention can be applied.

FIG. 2 is a diagram for explaining the operation of the present invention.

FIG. 3 is a flowchart for explaining the operation of the present invention.

[Explanation of symbols]

1 Television camera 1a Camera rotation device 2 Control section TV Television receiver LS Fire detector 3 Joystick

Claims (1)

[Claims] 1. A device for measuring a fire source position using a television camera rotated by a camera rotation device, comprising: a fire source position information acquisition means for obtaining fire source position information; The television camera is rotated in the direction of the fire source position based on the fire source position information obtained by the information acquisition means, and the obtained fire source position information and the current position of the television camera are A fire source position measuring device, comprising: a control section that sends a rotation control signal to the camera rotation device so as to change the rotation speed of the television camera based on the angular difference between directions.