JPH01268576A - Fire extinguisher - Google Patents

Abstract

PURPOSE:To contrive to take the image of flame exactly before the flame grows, by a method wherein the size of the flame is detected through a flame image, taken by a zoom type monitoring camera, and wherein flame size signal is transmitted to a control section, and wherein the scale of the flame size signal is discriminated by the control section, and wherein zoom control signal according to the flame size is transmitted to a camera controlling section. CONSTITUTION:A zoom type monitoring camera is zoom/wide-controlled by driving signal (e) from a camera controlling section 4. In a flame size detecting section 2, flame image signal (a) fed from the zoom type monitoring camera 1 is taken by image taking-in timing signal (b) from a control section 3, and the size of flame is discriminated, and flame size signal (c) is transmitted to the control section 3. From the control section 3, to the flame size detecting section 2, on specified timing, the image taking-in timing signal (b) is transmitted, and the size of the obtained flame size signal (c) is confirmed, and if the size is smaller than the specified size, control signal (d) as zoom command signal is transmitted to the camera controlling section 4. Even the flame of a small fire source at the time of the start of fire can be certainly detected, and the fire can be extinguished before the flame grows.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a fire extinguishing system used in the field of disaster prevention.

Conventional technology In the past, a video of the source of the fire was transmitted from a surveillance camera when a detector was activated (fire detection), and the fire was confirmed by viewing the video.

Problems to be Solved by the Invention However, when the fire source (flame) is small, such as in the case of a fire source that is far away or in the early stages of fire, it is impossible to judge the flame and overlook it, making it impossible to carry out appropriate initial extinguishing. Met.

The present invention aims to automatically enlarge a small image that appears to be the source of a fire to a predetermined size so that flames can be accurately photographed before they grow.

Means for Solving the Problems In order to solve this problem, the present invention provides a zoom type surveillance camera that monitors fires, a camera control unit that controls the zoom type surveillance camera with a control signal from a control unit, and a camera control unit that controls the zoom type surveillance camera using a control signal from a control unit. and a flame size detection unit that detects flame size from a flame image taken by a zoom surveillance camera and sends a flame size signal to a control unit, and the control unit determines the size of the flame size signal and determines the flame size. The configuration is such that a zoom control signal corresponding to the camera control unit is sent to the camera control unit.

Function: The present invention determines the size of the flames at the source of the fire captured by a zoom surveillance camera, and provides appropriate zoom instructions for flame images that are smaller than a predetermined size and cannot be determined to be a fire. This will enable you to accurately judge flames.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a zoom type surveillance camera, which is controlled to zoom/wide-angle by a drive signal 0 from a camera control section 4.

Reference numeral 2 denotes a flame size detection unit which takes in the flame video signal a supplied from the zoom type surveillance camera 1 with the video capture timing signal from the control unit 3, determines the size of the flame, and sends the flame size signal C to the control unit 3. Send. The control unit 3 sends a video capture timing signal to the flame size detection unit 2 at a predetermined timing, checks the size of the obtained flame size signal C, and instructs the camera control unit 4 to zoom if the size is smaller than the predetermined size. A control signal d is sent out as a signal.

Next, the specific operation will be explained.

First, a description will be given from the point in time when a fire detector (not shown) detects a fire and the zoom surveillance camera 1 captures the flame.

The zoom surveillance camera 1 sends a flame image signal a to the flame size detection section 2. The flame size detection section 2 sequentially captures the flame image signal a in accordance with the instruction of the video capture timing signal A from the control section 3. Although not shown in the explanatory diagram, the method for capturing the flame video signal & is to convert an analog video signal into a digital signal. Furthermore, in order to reduce the memory storage capacity and speed up processing, a method is used in which sampling input processing is performed and data is captured. The flame size is detected by
Sequentially scan in the direction/Y direction and cut out the area (range) where the flame exists. An example of the result is shown in FIG. 2a'. This result is sent as a flame size signal C to the control section. A microcomputer (not shown) built in the control unit 3 that receives the flame size signal C determines whether the flame size signal C is a predetermined size or not. (The predetermined size refers to a size that can be used to determine that it is a fire. For example, a size that is necessary to determine a fire based on flame fluctuations, color components, etc.).

As a result of the judgment, if the predetermined flame size has not been reached, a control signal d (up/down/left/right movement instruction signal) is sent to the camera control unit 4 so that the flame image signal a is centered on the zoom type surveillance camera. For example, Fig. 2bz11. b' The state shown in z11'. The camera control unit 4, which has received the control signal d, sends a drive signal e to the zoom type surveillance camera so that the above state is achieved.
Controlled by Next, the control section 3 sends a control signal d, which is a zoom instruction signal, to the camera control section 4. The camera control unit 4, which has received the control signal d, sends a drive signal e to the zoom surveillance camera 1. The zoom type surveillance camera 1 starts a zoom operation in response to the drive signal e and sends a flame image signal a to the flame size detection section. The control section 3 sends an image capture timing signal to the flame size detection section 2. The flame size detection section 2, which has received the video capture timing signal C, sends out the flame size signal C to the control section 3 in the manner described above. The control unit 3, which has received the flame size signal C, determines whether the flame size has reached a predetermined size. If the size is smaller than the predetermined size, a zoom instruction signal is sent to the camera control section 4 and the above operation is repeated. As a result of the judgment, if the size reaches a predetermined size or more, a zoom end instruction signal is sent along with the control signal d. The camera control unit 4, which has received the control signal d, instructs the zoom surveillance camera 1 to end zooming. As a result, states c and c' shown in FIG. 2 can be obtained.

As is clear from the above explanation, even a small flame at the source can be reliably detected when a fire occurs, so it can be extinguished before the flame grows.

Effects of the Invention According to the present invention, effective initial fire extinguishment can be achieved by reliably detecting a small flame at the source. Furthermore, since it is possible to reliably detect flames that occur far from fire extinguishing equipment, a wide range of fire monitoring can be realized with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a fire extinguishing system according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the flame detection/enlargement operation. 1...Zoom type surveillance camera, 2...Flame size detection unit, 3...Control unit, 4...
Camera control unit. Name of agent: Patent attorney Toshio Nakao and 1 other person a-
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Claims (1)

[Claims] a zoom surveillance camera that monitors a fire; a camera control section that controls the zoom surveillance camera using a control signal from a control section; and a camera control section that detects a flame size from a flame image taken by the zoom surveillance camera and generates a flame size signal. a flame size detection section that sends out a flame size signal to a control section, the control section determining the magnitude of the flame size signal and sending out a zoom control signal according to the flame size to a camera control section.