JP-7855957-B2 - Fire detection device, fire detection method, and fire detection program

Inventors

• 橋本　礼生
• 谷口 弘師
• 河合 宏
• 可西 哲平
• 藤井 勝

Assignees

• オムロン株式会社

Dates

Publication Date

20260511

Application Date

20220715

Claims (9)

1. A detection unit that detects a moving object that has stopped within the target area, An adjustment unit that changes the imaging area of the infrared camera to the stopping position of the moving object detected by the detection unit, A first determination unit processes frame images captured by the infrared camera and determines whether a fire has occurred at the stopping position, A fire detection device equipped with the following features.
2. The infrared camera is mounted on a pan/tilt head whose angle can be changed in two orthogonal axes. The adjustment unit generates a drive signal to the pan/tilt head that changes the imaging area of the infrared camera to the stopping position of the moving body detected by the detection unit. The fire detection device according to claim 1.
3. The adjustment unit generates a zoom signal that changes the imaging magnification of the infrared camera according to the stopping position of the moving object detected by the detection unit. The fire detection device according to claim 2.
4. The aforementioned moving object is a vehicle, The system includes a second determination unit that determines whether the stop of a moving object detected by the detection unit is due to traffic congestion. If the second determination unit determines that the vehicle is stopped due to traffic congestion, the first determination unit does not determine whether a fire has occurred at the stopping position. A fire detection device according to any one of claims 1 to 3.
5. The detection unit processes the frame image of the visible light camera that captured the target area and detects a moving object that has stopped within the target area. A fire detection device according to any one of claims 1 to 3.
6. The detection unit processes the frame images of the visible light camera that captured each of the multiple division areas that make up the target area, and detects a moving object that has stopped within the target area. A fire detection device according to any one of claims 1 to 3.
7. The aforementioned moving object is a vehicle, The aforementioned target area is inside a tunnel. A fire detection device according to any one of claims 1 to 3.
8. A detection step to detect a moving object that has stopped within the target area, An adjustment step to change the imaging area of the infrared camera to the stopping position of the moving object that was detected to have stopped in the detection step, A determination step involves processing the frame image captured by the infrared camera and determining whether a fire has occurred at the stopping position. A fire detection method performed by a computer.
9. A detection step to detect a moving object that has stopped within the target area, An adjustment step to change the imaging area of the infrared camera to the stopping position of the moving object that was detected to have stopped in the detection step, A determination step involves processing the frame image captured by the infrared camera and determining whether a fire has occurred at the stopping position. A fire detection program that causes a computer to execute.

Description

This invention relates to a technology for detecting the occurrence of fires in areas where an unspecified number of mobile objects (vehicles, autonomous robots, etc.) are moving. Conventionally, a system for detecting fires occurring in tunnels where vehicles are traveling existed, such as the system described in Patent Document 1. This system processes frame images of the tunnel captured by an infrared camera to detect the occurrence of a fire. Japanese Patent Application Publication No. 5-46886Japanese Patent Publication No. 2017-102634 This is a diagram illustrating the fire detection system in this example.This is a schematic diagram showing the area where the fire detection system in this example will detect the occurrence of a fire.This is a block diagram showing the main components of the fire detection device in this example.This flowchart shows the operation of the fire detection device in this example.This is a block diagram showing the configuration of the main part of the fire detection device in modified example 1.This is a flowchart showing the operation of the fire detection device in the modified example 1. The embodiments of this invention will be described below. <1. Application Examples> Figure 1 is a schematic diagram showing the fire detection system in this example. Figure 2 is a schematic diagram showing the target area where the fire detection system in this example detects the occurrence of a fire. The fire detection system 100 in this example detects a fire inside a tunnel formed on a road through which a vehicle 110 is traveling. In this example, the tunnel where the fire is detected corresponds to the target area in this invention. Also, in this example, the vehicle 110 corresponds to the moving object in this invention. As shown in Figure 1, the fire detection system 100 in this example includes a fire detection device 1, multiple infrared cameras 2 (2-1 to 2-n), multiple cameras 5 (5-1 to 5-m), and a guide board 7. Signboard 7 is installed just before the tunnel entrance. Signboard 7 displays guidance messages to drivers of vehicles 110 entering the tunnel, depending on the traffic conditions inside the tunnel. For example, if a fire breaks out inside the tunnel, the guidance message displayed on signboard 7 might be, "Entry prohibited, fire in the tunnel." Similarly, if there is traffic congestion inside the tunnel, the guidance message displayed on signboard 7 might be, "Drive with caution, traffic congestion in the tunnel." Multiple infrared cameras 2 (2-1 to 2-m) are, for example, far-infrared cameras. Each infrared camera 2 (2-1 to 2-m) is mounted on a corresponding pan/tilt head 3 (3-1 to 3-m). The pan/tilt head 3 changes the angle (imaging direction) of the infrared cameras 2 in response to pan and tilt drive signals input from the fire detection device 1. That is, the angle of the infrared cameras 2 is changed by the pan/tilt head 3 in two orthogonal axes (pan and tilt directions). Furthermore, the infrared cameras 2 change their magnification in response to the zoom signal input from the fire detection device 1. That is, the infrared cameras 2 operate as so-called PTZ cameras. In this example of the fire detection system 100, the infrared cameras 2 are installed at approximately constant intervals in the direction of travel of the vehicle 110. In the example shown in Figure 2, the distance between infrared cameras 2-1 and 2-2 in the direction of travel of the vehicle 110 is approximately the same as the distance between infrared cameras 2-2 and 2-3 in the direction of travel of the vehicle 110. Also, in this example, the installation positions of the infrared cameras 2 in the width direction of the tunnel (vehicle width direction) are alternating in the direction of travel of the vehicle 110. In the example shown in Figure 2, infrared cameras 2-1 and 2-3 are installed on the left shoulder (or roadside) in the width direction of the tunnel (vehicle width direction), and infrared camera 2-2 is installed on the right shoulder (or roadside) in the width direction of the tunnel (vehicle width direction). In this example of a fire detection system 100, multiple infrared cameras 2 are installed as shown in Figure 2 to prevent areas that cannot be imaged by any of the infrared cameras 2 (so-called blind spots) caused by occlusion from vehicles 110 (especially large vehicles such as trucks and trailers) traveling inside the tunnel. Furthermore, the multiple infrared cameras 2 do not necessarily have to be installed in the configuration shown in Figure 2, as long as it is possible to prevent areas from being captured by any of the infrared cameras 2 due to occlusion caused by vehicles 110 (especially large vehicles such as trucks and trailers) traveling inside the tunnel. Furthermore, while areas that cannot be imaged by any of the infrared cameras 2 may temporarily occur due to occlusion, the configuration may also omit either the infrared camera 2 installed on the left should