JP7839066B2 - Fire monitoring system - Google Patents

Description

This invention relates to a fire monitoring system.

Patent Document 1 describes a fire detection and extinguishing system for monitoring and extinguishing fires in facilities with large usable spaces such as arenas and halls, which combines a scanning fire detection device and a water discharge nozzle device. In such a fire detection and extinguishing system, a scanning fire detection device is installed in a position that allows for an overhead view of the restricted area. The restricted area is scanned in two dimensions using optical horizontal and vertical scanning, and a fire source is determined when the received signal of incident light to the infrared sensor exceeds a threshold level. The control device determines the coordinate position of the fire source based on the horizontal and vertical scanning angles of the fire detection device when the fire source is detected, and controls the water discharge direction and distance of the water discharge nozzle device. For example, the water discharge nozzle device is equipped with a water discharge nozzle with a fixed elevation angle that can rotate horizontally. The direction of water discharge to the fire source is set by controlling the rotation of the water discharge nozzle, and the water discharge distance is set by the water discharge pressure supplied to the water discharge nozzle.

This fire detection and extinguishing system has both an automatic water discharge mode and a manual water discharge mode. The automatic water discharge mode automatically starts water discharge when predetermined conditions are met, after the water cannon is ready to discharge, without the need for a supervisor to operate the manual water discharge switch. The manual water discharge mode, on the other hand, requires a supervisor to manually start water discharge by operating the manual water discharge switch after the water cannon is ready to discharge.

Japanese Patent Application Publication No. 10-258136

Let's consider the case where this fire detection system is installed in a bowl-shaped building (for example, a baseball field).
Figure 18 shows an example of a side cross-section of a mortar-shaped fire-protected object 1800. The fire-protected object 1800 shown in the figure has a flat surface 1801 and an inclined surface 1802. A scanning type fire detection device 1803 is installed on the upper edge of the inclined surface 1802.

Let's assume a fire (fire source 1804) occurs on the flat surface 1801 of the fire-protected object 1800. In this case, the distance d1 in plan view from the fire detection device 1803 to the fire source 1804 can be calculated using the following formula (1).
d=h×tanθ...(1)
In equation (1), d represents the distance from the fire detection device 1803 to the fire source in a plan view, h represents the installation height of the fire detection device 1803, and θ represents the depression angle of the fire detection device 1803 when photographing the fire source.

Next, let's consider the case where a fire (fire source 1805) occurs on the inclined surface 1802 of the fire-protected object 1800. In this case, if we use the above formula (1) to calculate the distance to the fire source 1805, the calculated distance will be d2. This distance d2 is different from the actual distance d3. If we calculate the position coordinates of the fire source 1805 based on this incorrect distance d2, we will obtain incorrect position coordinates.

This invention was made in view of these circumstances, and aims to reduce calculation errors in the location of the fire source that occur when the fire source is located on an inclined surface of the object to be protected from fire.

To solve the above problems, the fire monitoring system according to the present invention is a fire detection means for monitoring a fire-protected object having a flat surface and an inclined surface adjacent to the flat surface, comprising: a fire detection means equipped with an infrared camera mounted on an electric pan/tilt head so as to be able to rotate and tilt; and a fire source location calculation means for calculating the fire source location based on the installation position of the fire detection means and the rotation angle and tilt angle of the infrared camera that is detecting the fire source. The fire location calculation means is characterized in that, if the calculated fire source location overlaps with the inclined surface in a plan view, the fire source location is corrected so that it becomes the intersection point of the optical axis of the infrared camera that is detecting the fire source and the inclined surface in a side view, or the area including said intersection point.

According to this invention, it is possible to reduce calculation errors in the location of the fire source that occur when the fire source is located on an inclined surface of the object to be protected from fire.

Figure 1 shows an example of the coverage area of this water cannon system. Figure 2 shows an example of a water cannon system configuration. Figure 3 shows an example of the arrangement and protective range of the water cannon 201. Figure 4 shows an example of the external appearance of the fire detection device 203. Figure 5 shows an example of the arrangement and coverage area of the fire detection device 203. Figure 6 shows an example of the arrangement and coverage area of the fire detection device 203. Figure 7 shows an example of the functional configuration of the water cannon/fire detection control panel 205. Figure 8 shows an example of the functional configuration of the water cannon central control panel 207. Figure 9 shows an example of the operation sequence 900 in automatic mode. Figure 10 shows an example of the operation sequence 1000 in manual mode. Figure 11 shows an example of the operation flow 1100 for normal exploration. Figure 12 shows an example of the operation flow 1200 for fixed-point exploration. Figure 13 shows an example of the operation flow 1300 for exploration A. Figure 14 shows an example of the operation flow 1400 of B exploration. Figure 15 shows an example of the fire source location calculation flow 1500. Figure 16 shows an example of a plan view of the fire detection device 203. Figure 17 shows an example of a side cross-section of a fire-protected object 1700. Figure 18 shows an example of a side cross-section of a fire-protected object 1800.

1. Embodiment 1-1. Configuration This embodiment is a sprinkler system using a water-discharge type head (hereinafter referred to as the "water cannon system"). This water cannon system is a sprinkler system that combines a fire monitoring system for effectively detecting fires occurring in fire-protected buildings with large spaces or high ceilings, and a fire extinguishing system for effectively extinguishing fires.

This water cannon system consists of a water cannon, remote-controlled valves, fire pumps, fire detection equipment, fire detection control panel, water cannon/fire detection control panel, water cannon central control panel, water cannon field control panel, and water cannon information processing panel, etc.

When the fire detection system detects a fire, it proceeds to pinpoint the exact location of the fire source. Once the fire source location is determined, it selects and aims the water cannon. In automatic mode, a timer activates, and upon completion of the countdown, the corresponding remote-controlled valve is automatically opened and the fire pump is activated, initiating water discharge from the cannon.

If fine-tuning of the water discharge position is necessary, the direction of the water cannon can be adjusted by viewing and operating the image captured by the fire detection system's visible camera on the central control panel of the water cannon. Alternatively, it is also possible to directly identify the fire source on-site and adjust the water cannon's direction using the on-site control panel.

The structure protected by this water cannon system has a retractable roof, which, when closed, encloses a large open space. It is primarily used for baseball games and can accommodate a large number of people.
This fire-protected structure is bowl-shaped and has a flat surface and an adjacent inclined surface. Seating is provided on the inclined surface.

Figure 1 shows an example of the coverage area of this water cannon system. This water cannon system covers the field area 101 (the area enclosed by the thick solid line) and the spectator seating area 102 (the area enclosed by the dashed line) shown in the figure.

Next, Figure 2 shows an example of a water cannon system configuration.
The protected area includes a water cannon 201 and a remote-controlled valve 202 for controlling the water discharge from the water cannon 201. The remote-controlled valve 202 is installed in the water supply pipe connecting the water cannon 201 and the fire pump 211.

Furthermore, within the protected area, a fire detection device 203 and a water cannon/fire detection control panel 205 and a fire detection control panel 206 for controlling the fire detection device 203 are positioned. The fire detection device 203 is connected to the water cannon/fire detection control panel 205 or the fire detection control panel 206 via a signal line through a fire detection device relay panel 204. The water cannon/fire detection control panel 205 is connected to the remote control valve 202 via a signal line.

Furthermore, a water cannon field control panel 208 for operating the water cannon 201 is located within the protected area. This water cannon field control panel 208 is connected to both the water cannon 201 and the water cannon/fire detection control panel 205 via signal lines.

The pump room houses a fire pump 211 and a pump control panel 212 for controlling the fire pump 211.

The disaster prevention center houses a water cannon information processing panel 209, a water cannon central control panel 207, and a receiver 210. The water cannon information processing panel 209 is connected to the water cannon central control panel 207 and the receiver 210 by signal lines. The water cannon information processing panel 209 is also connected to the fire detection device relay panel 204, the water cannon/fire detection control panel 205, the fire detection control panel 206, and the pump control panel 212 by signal lines.
The main components are described below.

The water cannon 201 is a movable, compact head designed for spraying water over a wide area. Based on information from the fire detection device 203 and other sources, the water cannon 201 automatically rotates towards the fire source. The spray angle and shape change in three stages (far, medium, and near) depending on the distance to the fire source, effectively dispersing water against the fire.

Figure 3 shows an example of the arrangement and protective range of the water cannon 201.
The water cannons 201 are positioned in three locations: the first base side seating area, the third base side seating area, and near the backstop on the center field side. Each water cannon has three spraying patterns depending on the distance to the fire source: long-range 301, intermediate 302, and close-range 303.

Next, the remote-controlled valve 202 is a valve for controlling the discharge and cessation of water discharge from the water cannon 201. When a fire occurs and the water cannon 201 is selected, the corresponding remote-controlled valve 202 is opened by automatic or manual control, and water discharge from the water cannon 201 begins.

The fire detection device 203 is a fire detection means that searches a designated monitoring area within a fire-protected building and acquires images of that area. The acquired images are transmitted via the fire detection device relay panel 204 to the water cannon/fire detection control panel 205, the fire detection control panel 206, and the water cannon information processing panel 209.

Figure 4 shows an example of the external appearance of the fire detection device 203. Figure 4(a) shows the left side, Figure 4(b) shows the front, Figure 4(c) shows the right side, and Figure 4(d) shows the top view.
The fire detection device 203 consists of an electric pan/tilt head 401 for horizontal rotation, an electric pan/tilt head 402 for vertical rotation mounted on the electric pan/tilt head 401, and an infrared camera 403 and a visible light camera 404 mounted on the rotation axis of the electric pan/tilt head 402 in a substantially horizontal direction.

The motorized pan/tilt head 401 rotates the infrared camera 403 and the visible camera 404 in a substantially horizontal plane around the Z-axis.
The motorized pan/tilt head 402 rotates the infrared camera 403 and the visible camera 404 in a nearly vertical plane around the X-axis.
The infrared camera 403 and the visible light camera 404 can be rotated and tilted using motorized pan/tilt heads 401 and 402, and can sequentially stop at 12 different monitoring positions to acquire images.

Neither the infrared camera 403 nor the visible light camera 404 are mounted on the rotation axis (Z-axis) of the motorized pan/tilt head 401 in a plan view. The infrared camera 403 is located at a distance d1 from the rotation axis (Z-axis) in a plan view, and the visible light camera 404 is located at a distance d2 from the rotation axis (Z-axis) in a plan view (see Figure 4(d)).

Figures 5 and 6 show examples of the arrangement and coverage range of the fire detection device 203. Figure 5 specifically shows the coverage range for the first detection mode, and Figure 6 specifically shows the coverage range for the second detection mode.
The fire detection devices 203 are basically installed one per water cannon 201, specifically in three locations: the first base side seating area, the third base side seating area, and near the center field backstop. However, since this alone is not enough to monitor the entire area under surveillance, an additional fire detection device 203 is installed near the ceiling roof above the center field backstop (hereinafter referred to as the "large window").

At this time, the fire detection device 203 on the center side is kept in a deactivated state under normal circumstances because its monitoring range is covered by the fire detection devices 203 on the large window, third base side, and first base side. Furthermore, since the combination of the fire detection device 203 on the large window and either the first or third base side fire detection device 203 can monitor most of the monitoring range, the remaining device monitors the remaining area through fixed-point scanning. To perform this control, two types of scanning modes (see Table 1) are defined and switched at regular intervals using a timer.

In this context, "normal exploration" refers to an exploration method in which the fire detection device 203 stops at regular intervals to acquire thermal images and explore the entire monitoring area. Even if the fire detection device 203 has not completed a full circuit, it will notify the approximate location of the fire source when it finds one.
On the other hand, fixed-point exploration is an exploration method in which the fire detection device 203 acquires thermal images at a fixed angle and conducts an exploration. The fire detection device 203 notifies the approximate location of the fire source when it finds it.

Figure 5, mentioned above, shows the monitoring range of the first detection mode. In the figure, the solid line 501 indicates the monitoring range of the fire detection device 203 on the first base side, the dashed line 502 indicates the monitoring range of the fire detection device 203 on the third base side, and the double dashed line 503 indicates the monitoring range of the fire detection device 203 at the large window.
On the other hand, Figure 6, mentioned above, shows the monitoring range of the second detection mode. In this figure, the solid line 601 shows the monitoring range of the fire detection device 203 on the first base side, the dashed line 602 shows the monitoring range of the fire detection device 203 on the third base side, and the dashed line 603 shows the monitoring range of the fire detection device 203 at the large window.

Next, I will explain the water cannon and fire detection control panel 205.
The water cannon/fire detection control panel 205 controls the fire detection device 203, identifies the presence and location of a fire source from the images received from it, and sends the information to the water cannon information processing panel 209. The water cannon/fire detection control panel 205 also receives control commands from the water cannon information processing panel 209 and controls the water discharge pattern and rotation of the water cannon 201, as well as the elevation and rotation of the visible camera 404 of the fire detection device 203.

Figure 7 shows an example of the functional configuration of this water cannon/fire detection control panel 205.
The water cannon/fire detection control panel 205 comprises a normal detection unit 701, a fixed-point detection unit 702, an A detection unit 703, a B detection unit 704, and a water cannon control unit 705. These functions are provided by a processor executing a control program stored in memory.

First, the normal detection unit 701 performs a normal detection scan. Specifically, the normal detection unit 701 stops the infrared camera 403 at regular intervals, acquires images, and scans the entire monitoring area. During this process, the normal detection unit 701 analyzes the images acquired by the infrared camera 403 at each monitoring position and compares the temperature at the highest temperature location with the fire detection temperature setting value. The fire detection temperature setting value referenced in this comparison process is a threshold value pre-set by the user.

Furthermore, the normal detection unit 701 determines whether the above-mentioned highest temperature location is included in the mask region. The mask region referenced in this determination is a region pre-set by the user to be excluded from fire detection, and is set individually for each of the 12 monitoring locations. Therefore, the user can individually set the region to be excluded from fire detection for each of the 12 monitoring locations.

The normal detection unit 701 determines a fire to have occurred if, based on the above comparison and determination, the temperature at the highest temperature location exceeds the fire detection temperature setting value, and the highest temperature location is not included in the mask area corresponding to the monitoring location.

The normal detection unit 701 calculates the approximate location of the fire source after determining that a fire has occurred.
At that time, the normal detection unit 701 first acquires coordinate values (set values) indicating the installation position of the fire detection device 203. More specifically, the coordinate values acquired here indicate the installation position of the motorized pan/tilt head 401 of the fire detection device 203.
The normal detection unit 701 also acquires a value (set value) indicating the distance in a plan view from the pivot axis of the motorized pan/tilt head 401 of the fire detection device 203 to the infrared camera 403. The normal detection unit 701 then corrects the acquired coordinate value with the distance value that was also acquired and calculates a correction value.

Specifically, the normal exploration unit 701 calculates correction values for the x and y coordinates of the coordinate values (x, y, z) using the following equations (2) and (3).
X'=x+Acos(α)...(2)
Y'=y+A sin(α)...(3)
In equations (2) and (3), X' and Y' are correction values for the x and y coordinates, A represents the distance in a plan view from the pivot axis of the motorized pan/tilt head 401 to the infrared camera 403 (for example, the distance d1 illustrated in Figure 4(d)), and α represents the rotation angle of the infrared camera 403 when imaging the fire source.

Furthermore, the variables x, y, A, α, X'(x + Acos(α)) and Y'(y + Asin(α)) in equations (1) and (2) are illustrated in Figure 16. Figure 16 shows an example of the plan view of the fire detection device 203.

The normal detection unit 701 calculates a correction value, and then calculates the fire source position based on the calculated correction value, the rotation and elevation angles of the infrared camera 403 during fire source imaging, and the image captured by the infrared camera 403 (more specifically, the pixel position indicating the fire source).

Specifically, the normal detection unit 701 first corrects the rotation angle and elevation angle based on the image captured by the infrared camera 403. At that time, the normal detection unit 701 calculates the rotation angle and elevation angle as correction values, using the rotation angle and elevation angle measured when the pixel indicating the fire source is positioned approximately at the center of the screen.

Next, the normal detection unit 701 calculates the distance from the fire detection device 203 to the fire source in a plan view using the following formula (4).
D=H×tan(β)...(4)
In equation (4), D represents the distance from the fire detection device 203 to the fire source in a plan view, H represents the installation height of the fire detection device 203, and β represents the elevation angle of the infrared camera 403 when photographing the fire source.
The normal detection unit 701 substitutes the installation height (set value) of the fire detection device 203 and the elevation angle correction value into equation (4) to calculate the distance from the fire detection device 203 to the fire source in a plan view.

The normal exploration unit 701 calculates the distance to the fire source, and then uses equations (5) to (7) below to calculate the coordinates of the fire source.
x _i =X'+D×cos(α)...(5)
y _i =Y′+D×sin(α)...(6)
z _i =-z...(7)
In equations (5) to (7), (x _i , y _i , _zi ) are the coordinates of the fire source.

The normal detection unit 701 calculates the fire source location and then corrects the calculated fire source location by referring to a predetermined correction table. The correction table referred to at this time is a table for correcting calculation errors in the fire source location. The calculation error referred to here is the calculation error that occurs when the fire source is located on an inclined surface of the fire-protected object, as explained with reference to Figure 18.

The correction table pre-associates the coordinate values of the fire source (the origin being the installation position of the fire detection device 203) with the corresponding area containing the correct coordinate values. The normal detection unit 701 can identify the correct area corresponding to the calculated fire source location by referring to this correction table. For example, referring to Figure 17, if the calculated fire source location 1703 coincides with the inclined surface 1702 in a plan view, the normal detection unit 701 corrects the fire source location 1703 to an area that includes the intersection point 1704 of the optical axis 1705 of the infrared camera 403 that is capturing the fire source and the inclined surface 1702.
On the other hand, if the calculated fire source location 1706 is located on the flat surface 1701, the normal exploration unit 701, referring to the correction table, identifies the area including the fire source location 1706.

As a variation, the normal detection unit 701 may correct the fire source location using coordinate values instead of a specific area. For example, referring to Figure 17, if the calculated fire source location 1703 coincides with the inclined surface 1702 in a plan view, the normal detection unit 701 may correct the fire source location 1703 to the intersection point 1704 of the optical axis 1705 of the infrared camera 403 capturing the fire source and the inclined surface 1702.

In the fire source location calculation method described above, the installation position of the fire detection device 203 is corrected based on the amount of rotational axis misalignment of the infrared camera 403. As a result, the measurement error of the fire source location is reduced compared to the case where this correction is not performed.
In addition, the above calculation method corrects the initially calculated ignition source location using a correction table. As a result, calculation errors caused by the ignition source being located on an inclined surface of the fire-protected object are reduced.
The detailed processing of routine surveys will be described later.

Next, the fixed-point exploration unit 702 will be described.
The fixed-point survey unit 702 performs a fixed-point survey. Specifically, the fixed-point survey unit 702 uses an infrared camera 403 at a fixed angle to capture thermal images and conduct a survey. At that time, the fixed-point survey unit 702 analyzes the images acquired by the infrared camera 403 at a predetermined monitoring position and compares the temperature at the highest temperature location with the fire detection temperature setting value. The fire detection temperature setting value referenced in this comparison process is a threshold value that is set in advance by the user.

Furthermore, the fixed-point detection unit 702 determines whether the above-mentioned highest temperature location is included in the mask area. The mask area referenced in this determination is an area pre-set by the user to be excluded from fire detection, and is set individually for each of the 12 monitoring locations. Therefore, the user can individually set the area to be excluded from fire detection for each of the 12 monitoring locations.

The fixed-point detection unit 702 determines a fire to exist if, based on the above comparison and determination, the temperature at the highest temperature location exceeds the fire detection temperature setting value, and the highest temperature location is not included in the mask area corresponding to the monitoring location.

The fixed-point detection unit 702 calculates the approximate location of the fire source after determining that a fire has occurred. The method for calculating this approximate location of the fire source is the same as that used by the normal detection unit 701, so an explanation is omitted.
Detailed processing of the fixed-point survey will be described later.

Next, we will explain the A exploration unit 703.
The A-detection unit 703 performs the A-detection. The A-detection is performed simultaneously by three fire detection devices 203, excluding the fire detection device 203 that detected the fire, when a fire is detected during a normal detection or fixed-point detection. This A-detection differs from a normal detection in that, unlike a normal detection, no detection is performed beyond the monitoring position where the fire was detected, the A-detection is performed at least once at each monitoring position, regardless of whether a fire is detected.

Next, we will explain the B exploration unit 704.
The B exploration unit 704 performs the B exploration. This B exploration involves moving the fire detection device 203, which issued the A alarm, so that the fire point is in the center of the screen captured by the infrared camera 403, and then conducting the exploration to obtain more detailed positional information.

Specifically, when the normal detection unit 701, the fixed-point detection unit 702, or the A detection unit 703 detect a fire, the B detection unit 704 controls the motorized pan/tilt heads 401 and 402 so that the highest temperature position is approximately centered on the infrared camera 403's screen. At this time, the B detection unit 704 determines whether the elevation angle of the controlled motorized pan/tilt head 402 meets a predetermined condition. The predetermined condition considered in this determination is that the elevation angle of the motorized pan/tilt head 402 is 0° (horizontal) or less. If this condition is not met, there is a high probability that the fire source is sunlight, and therefore the B detection unit 704 cancels the fire detection by the normal detection unit 701, etc. This prevents false fire detection.

The B-surveillance unit 704 controls the motorized pan/tilt heads 401 and 402, and then acquires multiple images, including the highest temperature location, from the infrared camera 403. The B-surveillance unit 704 then analyzes the acquired images to identify the highest temperature in each image. After identifying the highest temperature, if the B-surveillance unit 704 determines that the identified highest temperature is equal to or greater than the forced alarm determination temperature, it corrects the highest temperature to the forced alarm replacement temperature. The forced alarm determination temperature referenced in this correction process is a threshold value pre-set by the user, and in this embodiment, it is set to 400°C. On the other hand, the forced alarm replacement temperature is a correction value pre-set by the user, and in this embodiment, it is set to 1000°C. This forced alarm replacement temperature is set to a temperature higher than the forced alarm determination temperature.

When the forced alarm detection temperature is set to 400°C, the flame temperature (measured at approximately 300°C in this system) is below 400°C and therefore is not corrected to the forced alarm replacement temperature. On the other hand, the sunlight temperature (measured at approximately 600°C in this system) is above 400°C and is therefore corrected to the fixed forced alarm replacement temperature (1000°C). As a result of this correction, false fire detection can be more reliably prevented in the temperature comparison process between images described later.

After applying the temperature correction described above, the B-surveillance unit 704 compares the correction values between the multiple images. If the temperature difference is below a predetermined threshold, the B-surveillance unit 704 cancels the fire detection made by the normal detection unit 701, etc. This is because a small or no temperature difference between images suggests that the fire source represented by those images is likely sunlight or its metallic reflection, rather than a flame with fluctuating temperature. By canceling the fire detection when the temperature difference is below a predetermined threshold, false fire detections can be prevented.

On the other hand, if the temperature difference exceeds a predetermined threshold as a result of the above comparison, the B exploration unit 704 calculates the fire source location from the image including the highest temperature location acquired from the infrared camera 403. Since this method for calculating the fire source location is the same as that of the normal exploration unit 701, a detailed explanation is omitted.

In summary, when the normal detection unit 701 or the like determines that there is a fire, and the predetermined conditions are met such that the elevation angle of the motorized pan/tilt head 402 is 0° (horizontal) or less, and the temperature difference between multiple images exceeds a predetermined threshold, the B exploration unit 704 identifies the location of the fire source from the image including the highest temperature location acquired from the infrared camera 403.
Further details regarding the processing of B exploration will be described later.

Next, the water cannon control unit 705 will be described.
The water cannon control unit 705 receives water cannon control commands transmitted from the water cannon central control panel 207 and controls the water cannon 201 so that it points towards the fire source.

Next, we will explain the fire detection control panel 206.
The fire detection control panel 206 is a modified version of the water cannon/fire detection control panel 205, with the water cannon control unit 705 removed, and is installed in relation to the large-window fire detection device 203 mentioned above.

The water cannon central control panel 207 is for the overall management of the water cannon system. In the event of a fire, this central control panel 207 displays images captured by the visible light camera 404 of the fire detection device 203 on a TV monitor, and also displays various information and operating status transmitted from the water cannon information processing panel 209 on an LCD monitor and the control unit. The control unit allows for control and switching of the visible light camera 404 and the water cannon 201, as well as water discharge operations.

Figure 8 shows an example of the functional configuration of the water cannon's central control panel 207.
The water cannon central control panel 207 comprises a water cannon control command unit 801, an automatic water discharge determination unit 802, a water discharge control command unit 803, and a notification unit 804. These functions are provided by a processor executing a control program stored in memory.

First, when the water cannon control command unit 801 receives a B alarm transmitted from the water cannon information processing panel 209 to the water cannon central control panel 207, it transmits a water cannon control command to the water cannon/fire detection control panel 205. The transmitted water cannon control command instructs the water cannon 201 to be controlled to point towards the fire source.

The automatic water discharge determination unit 802 determines whether the fire source location identified by the water cannon/fire detection control panel 205 or the fire detection control panel 206 is included in the automatic water discharge target area. The automatic water discharge target area referenced in this determination process is an area pre-set by the user and is the area subject to automatic water discharge. In this embodiment, the seating area is not included in this automatic water discharge target area.

The water discharge control command unit 803 automatically starts water discharge from the water cannon 201 to the fire source location identified by the water cannon/fire detection control panel 205, etc., when that location is included in the automatic water discharge target area.

If the location of the fire source identified by the water cannon/fire detection control panel 205, etc., is not included in the area subject to automatic water discharge, the notification unit 804 prompts the user to manually discharge water instead of automatically discharging water (in other words, notifies the user that automatic water discharge will not be performed).
As described above, in this embodiment, the area targeted by automatic water discharge does not include the audience seating. Therefore, if the fire source is located in the audience seating area, automatic water discharge will not be performed, and manual water discharge will be performed instead. With manual water discharge, it is possible to prevent the water from directly hitting the audience by starting the discharge towards a location a certain distance away from the audience seating area, informing the audience of the discharge, and then directing the discharge towards the fire source.

Next, I will explain the water cannon field control panel 208.
The water cannon field control panel 208 is installed in close proximity to the water cannon 201 so that the water cannon 201 can be operated directly while monitoring the fire situation on-site. In the event of a system failure in the control system from the water cannon central control panel 207 and the water cannon information processing panel 209, manual operation from the water cannon field control panel 208 is also possible.

The water cannon information processing panel 209 collects fire source location information from the water cannon/fire detection control panel 205 and the fire detection control panel 206, determines the fire source location, receives video signals from the visible camera 404, and controls the camera. In addition, the water cannon information processing panel 209, in coordination with the water cannon central control panel 207 and the water cannon field control panel 208, issues control commands, alarms, and displays information to various devices.

The receiver 210 is a fire alarm receiver installed as part of an automatic fire alarm system. This receiver 210 displays and alarms information regarding water discharge status, automatic/manual operation, and system malfunctions.

1-2. Operation The water cannon system is monitored and operated by a central water cannon control panel 207 installed at the disaster prevention center. In the event of a fire, a predetermined operational flow is used to quickly carry out initial firefighting activities. The predetermined operational flow includes fire detection by fire detection, and this fire detection has an automatic mode and a manual mode. The automatic and manual modes are described below.

1-2-1. Automatic Mode Figure 9 shows an example of the operation sequence 900 in automatic mode.
First, the water cannon/fire detection control panel 205A continuously performs normal or fixed-point detection (step 901). If a fire is detected as a result of the normal or fixed-point detection, the water cannon/fire detection control panel 205A notifies the water cannon information processing panel 209 of the detection results indicating the occurrence of a fire and the approximate location of the fire source (step 902). Upon receiving these detection results, the water cannon information processing panel 209 notifies the water cannon central operation panel 207 of an A alarm (step 903). Upon receiving this A alarm, the water cannon central operation panel 207 displays the A alarm on the LCD monitor.

The water cannon/fire detection control panel 205A performs a B-type search after transmitting the above-mentioned search results (step 904). If the B-type search detects a fire, the water cannon/fire detection control panel 205A notifies the water cannon information processing panel 209 of the search results, indicating the occurrence of a fire and the detailed location of the fire source (step 905). Upon receiving these search results, the water cannon information processing panel 209 notifies the water cannon central control panel 207 of a B-type alarm (step 906). Upon receiving this B-type alarm, the water cannon central control panel 207 displays a fire message on the LCD monitor and TV monitor. The water cannon central control panel 207 also transmits the information to the receiver 210 via the water cannon information processing panel 209.

In addition, the water cannon central control panel 207 selects the water cannon 201 and the water discharge pattern (step 907). Then, the water cannon central control panel 207 transmits a water cannon control command to the water cannon/fire detection control panel 205A via the water cannon information processing panel 209 (step 908). Upon receiving this water cannon control command, the water cannon/fire detection control panel 205A controls the water cannon 201A based on this command (step 909). As a result of this control, the water cannon 201A is directed towards the fire source.

The water cannon central control panel 207 determines whether the detailed location of the fire source is included in the automatic water discharge area after transmitting the above-mentioned water cannon control command (step 910). If the result of this determination is that the detailed location of the fire source is included in the automatic water discharge area, the water cannon central control panel 207 waits until it receives a B alarm from the second water cannon/fire detection control panel 205. On the other hand, if the result of this determination is that the detailed location of the fire source is not included in the automatic water discharge area, the water cannon central control panel 207 displays the fire compartment and the message "This is not an automatic water discharge area. Please check the site and perform appropriate initial firefighting." on the LCD monitor. The water cannon central control panel 207 then does not execute steps 918 and beyond, as described later.

As described above, in this embodiment, the area targeted by automatic water discharge does not include the audience seating. Therefore, if the fire source is located in the audience seating area, automatic water discharge will not be performed, and manual water discharge will be performed instead. With manual water discharge, it is possible to prevent the water from directly hitting the audience by starting the discharge towards a location a certain distance away from the audience seating area, informing the audience of the discharge, and then directing the discharge towards the fire source.
In addition, firefighting activities may be carried out using other fire extinguishing equipment (for example, indoor fire hydrants) instead of manual water discharge.

Furthermore, the prompt for manual water discharge via the water cannon's central control panel 207 may not be limited to message display, but may also be provided via voice output.

After receiving the above-mentioned B alarm notification, the water cannon information processing panel 209 transmits an A detection start command to all other water cannon/fire detection control panels 205 and fire detection control panels 206 (step 911). The following description will explain the case where the water cannon/fire detection control panel 205B receives this A detection start command.

When the water cannon/fire detection control panel 205B receives the A detection start command, it executes the A detection (step 912). If the A detection detects a fire, the water cannon/fire detection control panel 205B notifies the water cannon information processing panel 209 of the detection results, indicating the occurrence of the fire and the approximate location of the fire source (step 913). Upon receiving these detection results, the water cannon information processing panel 209 notifies the water cannon central operation panel 207 of an A alarm (step 914).

The water cannon/fire detection control panel 205B performs a B-type search after transmitting the above-mentioned search results (step 915). If the B-type search detects a fire, the water cannon/fire detection control panel 205B notifies the water cannon information processing panel 209 of the search results, indicating the occurrence of a fire and the detailed location of the fire source (step 916). Upon receiving these search results, the water cannon information processing panel 209 notifies the water cannon central operation panel 207 of a B-type alarm (step 917).

When the water cannon central control panel 207 receives this B alarm, it starts a 15-second timer countdown (step 918). When the count reaches zero, the water cannon central control panel 207 transmits a pump start command to the water cannon information processing panel 209 (step 919). Upon receiving this pump start command, the water cannon information processing panel 209 activates the fire pump 211 (step 920).

Furthermore, the water cannon central control panel 207 transmits a remote control valve open command to the water cannon information processing panel 209 (step 921). Upon receiving this command, the water cannon information processing panel 209 opens the remote control valve 202A for the water cannon 201A (step 922). As a result, water is discharged from the water cannon 201A towards the fire source.

Once the fire is extinguished by the water discharge and the restoration operation is performed at the water cannon's central control panel 207, the fire pump 211 will stop.
The above is an explanation of the automatic mode.

1-2-2. Manual Mode Figure 10 shows an example of the operation sequence 1000 in manual mode.
The operation sequence in manual mode is the same as that in automatic mode from step 901 to step 917. These steps will not be explained further.

The water cannon central control panel 207 remains in standby mode after receiving the second B alarm, without starting the countdown. In this state, when a center personnel member who has confirmed the fire operates the water discharge key (step 1001), the water cannon central control panel 207 transmits a pump activation command to the water cannon information processing panel 209 (step 1002). Upon receiving this pump activation command, the water cannon information processing panel 209 activates the fire pump 211 (step 1003).

Furthermore, the water cannon central control panel 207 transmits a remote control valve open command to the water cannon information processing panel 209 (step 1004). Upon receiving this command, the water cannon information processing panel 209 opens the remote control valve 202A for the water cannon 201A (step 1005). As a result, water is discharged from the water cannon 201A towards the fire source.

Another method of water discharge involves using the water cannon's on-site control panel 208. In this case, center personnel rush to the scene and confirm the fire. The center personnel then operate the water cannon's on-site control panel 208A to operate the water cannon 201A and acquire control. The center personnel then rotate the water cannon 201A, select the water discharge pattern, and operate the water discharge key (step 1006). Upon receiving this operation, the water cannon's on-site control panel 208A transmits a pump activation command to the water cannon information processing panel 209 (step 1007). Upon receiving this pump activation command, the water cannon information processing panel 209 activates the fire pump 211 (step 1008).

Furthermore, the water cannon's on-site control panel 208A transmits a remote control valve opening command to the water cannon's information processing panel 209 (step 1009). Upon receiving this command, the water cannon's information processing panel 209 opens the remote control valve 202A for the water cannon 201A (step 1010). As a result, water is discharged from the water cannon 201A towards the fire source.

Once the fire is extinguished by the water discharge and the restoration operation is performed at the water cannon's central control panel 207, the fire pump 211 will stop.
The above is an explanation of manual mode.

1-2-3. Normal Exploration Figure 11 shows an example of the operation flow 1100 for normal exploration. The normal exploration shown in the figure is performed by the normal exploration unit 701 of the water cannon/fire detection control panel 205 or the fire detection control panel 206.

The normal detection unit 701 moves the infrared camera 403 of the fire detection device 203 to one of the 12 monitoring positions (step 1101). In addition, the normal detection unit 701 acquires mask data corresponding to the destination monitoring position (step 1102). Then, the normal detection unit 701 acquires the thermal image captured by the infrared camera 403 at the monitoring position (step 1103).

After acquiring the thermal image, the normal exploration unit 701 analyzes the acquired thermal image and extracts the pixels with the highest temperature (step 1104). In this process, the normal exploration unit 701 extracts the pixels with the highest temperature from each of the four areas formed by dividing the thermal image vertically into four sections. However, the normal exploration unit 701 does not extract pixels from the masked area indicated by the acquired mask data.

After extracting pixels from each area, the normal exploration unit 701 performs distance conversion on the highest temperature of each pixel (step 1105). Specifically, the normal exploration unit 701 multiplies the highest temperature of each pixel by a correction coefficient corresponding to the area. For example, the normal exploration unit 701 multiplies the highest temperature of pixels within the first area by the correction coefficient corresponding to the first area.

After distance conversion, the normal detection unit 701 compares the calculated converted values with the fire detection temperature setting value (step 1106). If, as a result of this comparison, all converted values are less than or equal to the fire detection temperature setting value (NO in step 1106), the normal detection unit 701 returns to step 1101 and moves the infrared camera 403 to the next monitoring position. On the other hand, if, as a result of this comparison, any converted value exceeds the fire detection temperature setting value (YES in step 1106), the normal detection unit 701 then compares the number of pixels with converted values exceeding the fire detection temperature setting value with the set number (step 1107).

If the result of this comparison is that the number of pixels is less than the set number (NO in step 1107), the normal detection unit 701 returns to step 1101 and moves the infrared camera 403 to the next monitoring position. On the other hand, if the result of this comparison is that the number of pixels is equal to or greater than the set number (YES in step 1107), the normal detection unit 701 calculates the approximate location of the fire source (step 1108). In this case, the normal detection unit 701 calculates the approximate location of the fire source from the rotation angle and depression angle of the infrared camera 403 and the acquired image. The method for calculating this approximate location of the fire source will be described later as the fire source location calculation flow 1500.

After calculating the approximate location of the fire source, the normal detection unit 701 notifies the water cannon information processing panel 209 of the detection results indicating the occurrence of a fire and the approximate location of the fire source (step 1109).
The above is an explanation of routine exploration.

1-2-4. Fixed-point survey Figure 12 shows an example of the operation flow 1200 for fixed-point survey. The fixed-point survey shown in the figure is performed by the fixed-point survey unit 702 of the water cannon/fire detection control panel 205 or the fire detection control panel 206.

The fixed-point survey unit 702 moves the infrared camera 403 of the fire detection device 203 to a pre-specified monitoring position (step 1201). In addition, the fixed-point survey unit 702 acquires mask data corresponding to the destination monitoring position (step 1202). Then, the fixed-point survey unit 702 acquires the thermal image captured by the infrared camera 403 at the monitoring position (step 1203).

After acquiring the thermal image, the fixed-point survey unit 702 analyzes the acquired thermal image and extracts the pixel with the highest temperature (step 1204). At this time, the fixed-point survey unit 702 extracts the pixel with the highest temperature from each of the four areas formed by dividing the thermal image vertically into four sections. However, the fixed-point survey unit 702 does not extract pixels from the mask region indicated by the acquired mask data.

After extracting pixels from each area, the fixed-point exploration unit 702 performs distance conversion based on the highest temperature of each pixel (step 1205). Specifically, the fixed-point exploration unit 702 multiplies the highest temperature of each pixel by a correction coefficient corresponding to the area.

After distance conversion, the fixed-point detection unit 702 compares the calculated converted values with the fire detection temperature setpoint (step 1206). If, as a result of this comparison, both converted values are equal to the fire detection temperature setpoint (NO in step 1206), the fixed-point detection unit 702 returns to step 1203 and acquires the next thermal image. On the other hand, if, as a result of this comparison, any of the converted values exceed the fire detection temperature setpoint (YES in step 1206), the fixed-point detection unit 702 then compares the number of pixels with converted values exceeding the fire detection temperature setpoint with the set number (step 1207).

If the result of this comparison is that the number of pixels is less than the set number (NO in step 1207), the fixed-point detection unit 702 returns to step 1203 and acquires the next thermal image. On the other hand, if the result of this comparison is that the number of pixels is equal to or greater than the set number (YES in step 1207), the fixed-point detection unit 702 calculates the approximate location of the fire source (step 1208). In this case, the fixed-point detection unit 702 calculates the approximate location of the fire source from the rotation angle and depression angle of the infrared camera 403 and the acquired image. The method for calculating this approximate location of the fire source will be described later as the fire source location calculation flow 1500.

After calculating the approximate location of the fire source, the fixed-point survey unit 702 notifies the water cannon information processing panel 209 of the survey results indicating the occurrence of a fire and the approximate location of the fire source (step 1209).
The above is an explanation of fixed-point surveys.

1-2-5. A-Surveillance Figure 13 shows an example of the operation flow 1300 of A-surveillance. The A-surveillance shown in the figure is performed by the A-surveillance unit 703 of the water cannon/fire detection control panel 205 or the fire detection control panel 206.

Although the entity executing the processing differs, the processing itself is the same as that of the normal exploration, sharing steps 1101-1109. Since these steps have already been explained, their explanation will be omitted here.

Unlike routine surveys, Survey A involves conducting a survey at least once at every monitoring location, regardless of whether a fire is detected. Therefore, Survey A includes steps 1301 and 1302.

In step 1301, the A-detection unit 703 determines whether the infrared camera 403 has completed a full circuit of the monitoring positions. If the result of this determination is that the infrared camera 403 has not completed a full circuit of the monitoring positions (NO in step 1301), the A-detection unit 703 returns to step 1101 and moves the infrared camera 403 to the next monitoring position. On the other hand, if the result of this determination is that the infrared camera 403 has completed a full circuit of the monitoring positions (YES in step 1301), the A-detection unit 703 then determines whether a potential ignition source exists (step 1302).

Specifically, the A-detection unit 703 determines whether a "YES" determination was made in step 1107 during the process of the infrared camera 403 completing a full circuit of the monitoring positions. If the result of this determination is not "YES" (NO in step 1302), the A-detection unit 703 returns to step 1101 and moves the infrared camera 403 to the next monitoring position. On the other hand, if the result of this determination is "YES" (YES in step 1302), the A-detection unit 703 calculates the approximate location of the fire source (step 1108). In this case, the A-detection unit 703 calculates the approximate location of the fire source from the rotation angle and depression angle of the infrared camera 403 and the acquired image. The method for calculating this approximate location of the fire source will be described later as the fire source location calculation flow 1500.

After calculating the approximate location of the fire source, the A exploration unit 703 notifies the water cannon information processing panel 209 of the exploration results indicating the occurrence of a fire and the approximate location of the fire source (step 1109).
The above is an explanation of Exploration A.

1-2-6. B-Surveillance Figure 14 shows an example of the operation flow 1400 of B-surveillance. The B-surveillance shown in the figure is performed by the B-surveillance unit 704 of the water cannon/fire detection control panel 205 or the fire detection control panel 206.

The B-detection unit 704 calculates the movement angle (rotation angle and depression angle) of the infrared camera 403 so that the fire source is approximately at the center of the screen, based on the approximate location of the fire source obtained by normal detection, fixed-point detection, or A-detection (step 1401). After calculating the movement angle, the B-detection unit 704 determines whether the calculated depression angle is 0 degrees or less (step 1402). If the calculated depression angle is greater than 0 degrees (NO in step 1402), the B-detection unit 704 terminates the B-detection because there is a high probability that the fire source is sunlight. This prevents false detection of fire. On the other hand, if the calculated depression angle is 0° (horizontal) or less (YES in step 1402), the B-detection unit 704 moves the infrared camera 403 so that the fire source is approximately at the center of the screen (step 1403).

After moving the infrared camera 403, the B-surveillance unit 704 acquires multiple thermal images captured by the infrared camera 403 (step 1404). After acquiring the thermal images, the B-surveillance unit 704 analyzes the acquired thermal images and extracts the pixel with the highest temperature in each thermal image (step 1405). Then, the B-surveillance unit 704 performs distance conversion on the highest temperature of each extracted pixel (step 1406). Specifically, the B-surveillance unit 704 calculates a correction value by applying the highest temperature of each pixel to a predetermined correction formula. However, if the highest temperature is above the forced alarm determination temperature (400°C), the B-surveillance unit 704 replaces it with the forced alarm substitution temperature (1000°C) instead of applying it to the above correction formula. As a result of this correction, false fire detection can be more reliably prevented in step 1408, which will be described later.

After distance conversion, the B-surveillance unit 704 counts the number of pixels in each thermal image whose correction value exceeds the set fire detection temperature (step 1407). If the number of pixels counted in all thermal images is less than the set number (NO in step 1407), the B-surveillance unit 704 terminates the B-surveillance. On the other hand, if the number of pixels counted in any of the thermal images is equal to or greater than the set number (YES in step 1407), the B-surveillance unit 704 then compares the correction values of the highest temperatures across the multiple thermal images (step 1408).

As a result of this comparison, if the difference between the maximum and minimum values of the correction is less than or equal to a predetermined threshold (NO in step 1408), the B-surveillance unit 704 terminates the B-surveillance. This is because if there is little or no temperature difference between the images, it is highly likely that the fire source represented by those images is sunlight or its metallic reflection, rather than a flame with fluctuating temperature. By canceling the fire detection when the temperature difference is less than or equal to a predetermined threshold in this way, false fire detections can be prevented.
After the completion of exploration B, exploration A will be performed again.

On the other hand, if the difference between the maximum and minimum correction values exceeds a predetermined threshold as a result of this comparison (YES in step 1408), the B-detection unit 704 calculates the detailed location of the fire source (step 1409). In this case, the B-detection unit 704 calculates the detailed location of the fire source from the rotation angle and depression angle of the infrared camera 403 and the acquired image described above. The method for calculating this detailed location of the fire source will be described later as the fire source location calculation flow 1500.

After calculating the detailed location of the fire source, the B exploration unit 704 notifies the water cannon information processing panel 209 of the exploration results indicating the occurrence of a fire and the detailed location of the fire source (step 1410).
The above is an explanation of B exploration.

1-2-7. Calculation of Fire Source Location Figure 15 shows an example of the fire source location calculation flow 1500. The fire source location calculation flow 1500 shown in the figure is executed by the normal detection unit 701, fixed point detection unit 702, A detection unit 703, and B detection unit 704 of the water cannon/fire detection control panel 205 or fire detection control panel 206. In the following explanation, as an example, we will describe the case in which the normal detection unit 701 executes the fire source location calculation flow 1500.

The normal detection unit 701 acquires coordinate values (set values) indicating the installation location of the fire detection device 203 (step 1501).
Next, the normal detection unit 701 acquires the rotation angle and elevation angle of the infrared camera 403 of the fire detection device 203 (step 1502).
Next, the normal detection unit 701 acquires a value (set value) indicating the distance in a plan view from the pivot axis of the motorized pan/tilt head 401 of the fire detection device 203 to the infrared camera 403 (step 1503).

Next, the normal exploration unit 701 corrects the coordinate values obtained in step 1501 with the distance values obtained in step 1503 to calculate the correction values (step 1504). At this time, the normal exploration unit 701 calculates the correction values for the x and y coordinates of the coordinate value (x, y, z) using equations (2) and (3) described above. The specific calculation method has already been explained, so the explanation is omitted here.

After calculating the correction value, the normal exploration unit 701 acquires the heat source pixel coordinates of the thermal image captured by the infrared camera 403 (step 1505).
After acquiring the heat source pixel coordinates, the normal detection unit 701 calculates the fire source position based on the correction value calculated in step 1504, the rotation angle and elevation angle from step 1502, and the heat source pixel coordinates acquired in step 1505.

Specifically, the normal detection unit 701 first corrects the rotation angle and elevation angle based on the image captured by the infrared camera 403 (step 1506). At this time, the normal detection unit 701 calculates the rotation angle and elevation angle as correction values, using the rotation angle and elevation angle measured when the pixel indicating the fire source is positioned approximately at the center of the screen.

Next, the normal detection unit 701 substitutes the installation height (set value) of the fire detection device 203 and the elevation angle correction value into the above-mentioned equation (4) to calculate the distance from the fire detection device 203 to the fire source in a plan view (step 1507). The specific calculation method has already been explained, so the explanation is omitted here.

The normal exploration unit 701 calculates the distance to the fire source, and then uses equations (5) to (7) described above to calculate the fire source's location (step 1508). The specific calculation method has already been explained, so it will be omitted here.

After calculating the fire source location, the normal exploration unit 701 corrects the calculated fire source location by referring to the correction table described above (step 1509). At that time, the normal exploration unit 701 identifies the correct section corresponding to the calculated fire source location by referring to the correction table.
The above is an explanation of the fire source location calculation flow chart 1500.

In the fire source location calculation flow 1500 described above, the installation position of the fire detection device 203 is corrected based on the amount of rotational axis misalignment of the infrared camera 403. As a result, the measurement error of the fire source location is reduced compared to the case where this correction is not performed.
In addition, in the above fire source location calculation flow 1500, the fire source location, once calculated, is corrected using a correction table. As a result, calculation errors caused by the fire source being located on an inclined surface of the fire-protected object are reduced.

In the above fire source location calculation flow 1500, the heat source pixel coordinates are acquired in step 1505, and the fire source location is calculated based on the acquired heat source pixel coordinates. However, in B-type exploration, the infrared camera 403 is controlled so that the heat source is at the center of the screen; therefore, the heat source pixel coordinates are necessarily the coordinates of the screen center. For this reason, when the fire source location calculation flow 1500 is executed in B-type exploration, steps 1505 and 1506 may be omitted.

Furthermore, the calculated fire source location may be displayed on a display unit (LCD monitor) located in the water cannon central control panel 207, the water cannon information processing panel 209, or the water cannon field control panel 208. For example, by overlaying the calculated fire source location on a map showing the coverage area of the water cannon system, including the field area 101 and the spectator seating area 102, as shown in Figure 1, observers can easily confirm the fire source location.

2. Modifications The above embodiments may be modified as follows. The following modifications may be combined with each other.
(1) In the above embodiment, a baseball stadium is assumed to be the fire-protected building. However, the fire-protected building is not limited to a baseball stadium, and may be any other facility capable of accommodating spectators.

(2) The above-mentioned routine and A-type surveys assume 12 monitoring locations, but the number of monitoring locations may be changed as appropriate depending on the number of fire-protected buildings and the number of fire detection devices 203 installed.

(3) In the above-mentioned B-type detection, if the condition that the elevation angle of the motorized pan/tilt head 402 is 0° (horizontal) or less is not met, the fire detection determination made by the normal detection unit 701, etc., is canceled. However, this condition is merely an example, and the threshold for the elevation angle may be appropriately changed depending on the fire-protected object.

(4) In the above-mentioned B-type detection, 400°C is assumed as the forced alarm determination temperature, and 1000°C as the forced alarm replacement temperature. However, these values are merely examples and may be changed as appropriate depending on the expected false detection targets and the specifications of the device.

(5) In the above-described B-survey, the correction values for the highest temperature are compared across multiple thermal images, and if the difference between the maximum and minimum correction values is less than or equal to a predetermined threshold, the fire determination by the normal survey unit 701, etc., is canceled. Alternatively, the fire determination by the normal survey unit 701, etc., may be canceled if the correction values for the highest temperature match across multiple thermal images. In other words, the fire determination by the normal survey unit 701, etc., may be canceled if the difference in correction values across multiple thermal images is zero or less.

(6) In the above embodiment, the water cannon/fire detection control panel 205 is equipped with the functions shown in Figure 7, and the water cannon central control panel 207 is equipped with the functions shown in Figure 8. However, this functional arrangement is merely an example, and some or all of the functions provided by the water cannon/fire detection control panel 205 and the water cannon central control panel 207 may be distributed to other equipment.

(7) In the fire source location calculation flow 1500 described above, the normal detection unit 701 corrects the installation position of the fire detection device 203 using the above-described equations (1) and (2) (see step 1504). However, the normal detection unit 701 may also correct the installation position of the fire detection device 203 by referring to a predetermined table instead of using the above-described equations (1) and (2). The predetermined table referred to here is a table that stores correction values for each of the x and y coordinates in correspondence with the rotation angle of the infrared camera 403. The correction values stored in this table are values that have been calculated in advance for each rotation angle using the above-described equations (1) and (2).
The normal detection unit 701 may correct the installation position of the fire detection device 203 by referring to this table, using the distance in a plan view from the rotation angle of the motorized pan/tilt head 401 to the infrared camera 403.

(8) The infrared camera 403 and the visible light camera 404 can both rotate and tilt. However, depending on the target monitoring range, these cameras may be configured to perform only one of the rotation or tilt functions.

Furthermore, the present invention is not limited to the embodiments described above, and various modifications are included. For example, the embodiments described above are detailed for the purpose of clearly illustrating the present invention, and are not necessarily limited to those having all the described configurations. Also, it is possible to replace parts of the configuration of one embodiment with those of another embodiment, and it is also possible to add configurations from other embodiments to the configuration of one embodiment. In addition, it is possible to add, delete, or replace parts of the configuration of each embodiment with those of other embodiments.

Furthermore, each of the above-described configurations, functions, processing units, and processing means may be implemented in hardware, either partially or entirely, for example, by designing them as integrated circuits. Alternatively, each of the above-described configurations and functions may be implemented in software by a processor interpreting and executing programs that implement each function. Information such as programs, tables, and files that implement each function can be stored in memory, a recording device such as a hard disk or SSD (Solid State Drive), or a recording medium such as an IC card, SD card, or DVD.

Furthermore, the control lines and information lines shown are those deemed necessary for explanatory purposes, and not all control lines and information lines are necessarily shown in the actual product. In reality, it is safe to assume that almost all components are interconnected.
Furthermore, the above-described embodiments disclose at least the configuration described in the claims.

101...Field area, 102...Spectator seats, 201...Water cannon, 202...Remote control valve, 203...Fire detection device, 204...Fire detection device relay panel, 205...Water cannon/fire detection control panel, 206...Fire detection control panel, 207...Water cannon central control panel, 208...Water cannon local control panel, 209...Water cannon information processing panel, 210...Receiver, 211...Fire pump, 212...Pump control panel,
401, 402... Motorized pan/tilt head, 403... Infrared camera, 404... Visible light camera, 701... Normal exploration unit, 702... Fixed point exploration unit, 703... A exploration unit, 704... B exploration unit, 705... Water cannon control unit, 801... Water cannon control command unit, 802... Automatic water discharge determination unit, 803... Water discharge control command unit, 804... Notification unit

Claims (2)

A fire detection means for monitoring a fire-protected object having a flat surface and an inclined surface adjacent to the flat surface, comprising an infrared camera mounted on an electric pan/tilt head so as to be able to rotate and tilt,
The system includes a fire source location calculation means that calculates the location of the fire source based on the installation position of the fire detection means and the rotation angle and elevation angle of the infrared camera that is detecting the fire source,
The fire source location calculation means is characterized by correcting the calculated fire source location by referring to a predetermined correction table when the calculated fire source location coincides with the inclined surface in a plan view , so that the fire source location becomes the intersection point of the optical axis of the infrared camera capturing the fire source and the inclined surface in a side view, or the area including said intersection point. The aforementioned fire-protected building is a bowl-shaped facility capable of accommodating spectators,
The fire monitoring system according to claim 1 , characterized in that seating is provided on the inclined surface.