JP7480960B2 - Fire Prevention Systems - Google Patents

Description

The present invention relates to a fire prevention system that prevents fires from occurring.

A conventional monitoring system includes, for example, an infrared camera that captures images of multiple monitoring targets and outputs infrared image data of the captured images, a visible camera that can variably set the target to be captured and captures the target to be captured and outputs visible image data of the captured images, and a monitoring control device that can communicate between the infrared camera and the visible camera. The monitoring control device includes a first receiving means that receives infrared image data output from the infrared camera, a heat generating part extracting means that extracts a heat generating part that exceeds a preset temperature from the received infrared image data, a second receiving means that causes the visible camera to capture an image of the monitoring target including the extracted heat generating part and receives the visible image data, a determining means that recognizes the monitoring target from the received visible image data and determines whether the temperature of the heat generating part is abnormal based on a fire determination condition that is preset in association with the recognized monitoring target, and an alarm output means that outputs alarm information to notify the user when the temperature of the heat generating part is abnormal (see Patent Document 1 below).

JP 2017-097702 A

However, the above-mentioned conventional monitoring system is a method that requires that when applying the fire judgment conditions, heat-generating areas that exceed a preset temperature (hereinafter referred to as the "monitoring temperature") are extracted from the received infrared image data, and that judgment is made based on a threshold temperature set for each piece of equipment. Therefore, if the monitoring temperature becomes inappropriate due to changes in the environment or changes to the set temperature of the equipment, or if unexpected heat is generated below the monitoring temperature from equipment or materials that are not originally intended to generate heat, these areas cannot even be subject to the application of the fire judgment conditions, resulting in the problem that the fire prevention function does not work effectively.

Furthermore, because the equipment to be monitored varies in size and appearance (design) even if they have the same function, the method of identifying the equipment to be monitored by comparing the visible image data captured by the visible camera with the basic image data of each facility poses the problem that it is not possible to accurately identify the type or function of the equipment to be monitored, and it is necessary to narrow down the equipment to be monitored in advance to those with specific appearances. This problem can occur not only when unexpected heat is generated from equipment or materials that are not supposed to generate heat below the monitoring temperature, but also when the temperature is above the monitoring temperature, and can lead to a loss of confidence in the fire prevention function due to an error in the threshold temperature that serves as the judgment condition.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a fire prevention system that detects and evaluates events that may be precursors to the outbreak of a fire in a restricted area, and predicts and notifies the outbreak of a fire in advance.

The fire prevention system according to the present invention, which has been developed to solve the above problems, is characterized by comprising a temperature detection means for collecting temperature distribution data in a security zone, a measurement means for extracting isothermal areas present in the security zone from the temperature distribution data and deriving their temperature and shape, a classification means for classifying isothermal areas contained in the security zone using the temperature and shape of the isothermal areas as judgment factors, a determination means for detecting the occurrence of an isothermal area that cannot be classified as a fire precursor event, and a notification means for outputting fire warning information in response to a fire precursor event detected by the determination means.

The "isothermal area" is an area that is divided into areas that have a certain shape and temperature range due to a common cause, and examples of such areas include a heat source that generates heat itself, a heat dissipation area that receives heat directly from the heat source and its intersection area, a convection area in which the atmosphere of the heat dissipation area moves on an air current, and a thermal isolation area that is thermally isolated from other isothermal areas. Areas divided into areas due to a common cause may be divided into multiple stages according to the temperature range.

Moreover, "sorting" refers to dividing the above-mentioned isothermal regions according to their type, purpose, origin, or the like.
The types and formations of the isothermal areas include the heat source, heat dissipation area, intersection area, convection area, and heat isolation area, and the purposes of the isothermal areas include cooking, heating, air conditioning, lighting, beauty, power supply and power transmission, etc.
Examples of the types of heat sources include burners or heating wires of cooking appliances, burners, heating wires, wicks or heat sinks of heating appliances, heat exchange parts of air conditioning appliances, light-emitting parts of lighting appliances, heating wires of beauty appliances, coils or transformers of power supply appliances, or electric wires of power transmission appliances.

The fire prevention system according to the present invention may further be configured to include an information storage means for storing time series information on the temperature and shape of isothermal areas present in the alert zone. In this case, the determination means may be configured to detect fluctuations in the temperature and shape of isothermal areas present in the alert zone that do not conform to classification as a fire precursor event.

The fire prevention system according to the present invention can be configured to include a temperature detection means for collecting temperature distribution data in a security zone, a measurement means for extracting isothermal areas present in the security zone from the temperature distribution data and deriving their temperature, shape and location, a classification means for classifying isothermal areas contained in the security zone using the temperature, shape and location of the isothermal areas as judgment factors, a determination means for detecting the occurrence of an isothermal area that cannot be classified as a fire precursor event, and an alarm means for outputting fire warning information in response to a fire precursor event detected by the determination means.

In this case, an information storage means is provided for storing time series information on the temperature, shape and location of isothermal areas present in the alert zone, and the determination means can be configured to detect fluctuations in the temperature, shape and location of isothermal areas present in the alert zone that do not conform to classification as a fire precursor event.

The classification means may be configured to detect a person in the alert zone using the temperature and shape of the isothermal area as judgment factors. In this case, the determination means may be configured to detect the occurrence of an isothermal area that cannot be classified within a certain time after detecting a person in the alert zone as a man-made fire precursor event such as an accidental fire or arson.

The fire prevention system according to the present invention may further comprise a current detection means for detecting the current used in the alert area.
In this case, the determination means may be configured to detect a current exceeding the allowable capacity of the alert area as a fire precursor event caused by an overcurrent.

The fire prevention system of the present invention employs a method that does not set a monitoring temperature for determining the monitoring target when detecting a fire precursor event, and as a result, the system functions effectively even when the monitoring temperature becomes inappropriate due to changes in the environment or changes in the temperature settings of equipment, or when unexpected heat is generated from equipment or materials that are not originally intended to generate heat.

Furthermore, by adopting a method of classifying isothermal areas using the temperature and shape of the isothermal area based on the temperature distribution as judgment factors, it is possible to perform classification and information processing taking into account the type, purpose, or origin of the monitored object, regardless of the appearance or design of the equipment, for example, based on the stable shape given to the function-specific heat source (such as a ring-shaped burner cap and a radially spraying flame, a ring-shaped stove wick, a coil-shaped electric heating wire, a linear carbon heating element, an infrared lamp of a kotatsu, etc.) and the temperature range during operation.
Thus, even when unexpected heat generation occurs from equipment or materials that are not supposed to generate heat, even without specific information regarding the appearance, abnormalities in the monitored area can be accurately detected based on the basic temperature bands and contours of the isothermal area sorting results derived.

By adopting a configuration that includes the position of the isothermal area as a determining factor, the accuracy of sorting the isothermal area based on the general operating position is further improved.
Furthermore, by deriving the temperature, shape and location of the heat dissipation area caused by the heat source present in the alert zone from the temperature distribution data and using these as judgment factors in the sorting process, the purpose of use can be roughly estimated from, for example, the conduction of heat emitted from the heat source (to a cooking appliance, etc.) and the dissipation situation (into the indoor atmosphere), thereby further improving the sorting accuracy.
This function also contributes to avoiding the complexity of setting up when installing new equipment or changing the location of equipment.

The fire prevention system according to the present invention is configured to detect people in the alert area using the classification means, and to detect an increase in unclassifiable heat sources within a certain period of time after detecting the presence of a person in the alert area using the determination means as a man-made fire precursor event, thereby making it possible to predict man-made fires such as bonfires, incorrect operation of heating appliances, or arson.
Furthermore, by providing a current detection means for detecting the current used in the alert area and using the judgment means to detect current exceeding the capacity of the alert area as a judgment criterion for detecting fire precursor events caused by overcurrent, this contributes to more accurate detection of fire precursor events in relation to the occurrence of iso-thermal areas that cannot be classified, etc.

In this way, the fire prevention system of the present invention can detect fire precursor events that may be a sign of a fire occurring in a restricted area, and can predict and notify of a fire in advance, thereby contributing to fire prevention, early containment, and reduction of damage.

1 is a system diagram showing an example of a fire prevention system according to the present invention. 1 is a functional block diagram showing an example of a fire prevention system according to the present invention. 1 is a table showing an example of information used in the classification process of the fire prevention system according to the present invention. 4 is an example of a temperature distribution map that has been subjected to analysis processing in the fire prevention system according to the present invention. 4 is an example of a temperature distribution map that has been subjected to analysis processing in the fire prevention system according to the present invention. 4 is a flowchart showing an example of information processing in the fire prevention system according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a fire prevention system according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a system diagram showing an example of a fire prevention system according to the present invention.
This example is a fire prevention system in which a central monitoring device 1 and one or more relay devices 2 are connected via a wired or wireless local communication network 3 such as a LAN (Local Area Network).

The central monitoring device 1 and the repeater 2 are each assigned an individual identification code, and each repeater 2 is connected to a thermal camera 4, an imaging camera 5, or a zero-phase current transformer 13, etc., whose imaging range includes the alert area.
The repeater 2 is equipped with a monitoring interface 6 capable of communicating with the central monitoring device 1 in order to transmit image information (information that can be visualized) from the thermal camera 4 or the imaging camera 5 together with an identification code to the central monitoring device 1.
The central monitoring device 1 in this example includes a display unit 7 , an operation unit 8 , a linkage interface 9 , a communication interface 10 , a control unit 11 , and a memory unit 12 .

The display unit 7 is, for example, a liquid crystal display or other display device, light-emitting device, and their interface, and displays information regarding the issuance of an alarm, the degree of urgency, and information regarding the operation of the thermal camera 4, the imaging camera 5, and the zero-phase current transformer 13.
The operation unit 8 includes operation buttons, a keyboard, a touch panel, and interfaces thereof for receiving operation inputs from a user to the central monitoring device 1 .

The linkage interface 9 is a communication module for communicating with the relay device 2 in the security zone via the communication network 3, and demodulates the image information and current information transmitted from the relay device 2 together with the identification code into image data and current data (hereinafter collectively referred to as monitoring data) that can be analyzed by the control unit 11, and stores the data in the memory unit 12.

The communication interface 10 is a communication module for communicating with the outside of the alert area via a global communication network such as the Internet, and converts the information output from the control unit 11 according to the protocol of the global communication network, and transmits it to a specified address, for example, a user's mobile terminal 14 or a public institution 15 such as a fire station.

The control unit 11 is equipped with a CPU (Central Processing Unit), a memory, and an input/output port, and by the CPU executing a program stored in the memory, various functional means (see Figure 2) are configured and the operation of the central monitoring device 1 and the relay device 2 is controlled.
The storage unit 12 includes a storage means and a memory for storing the monitoring data transmitted from the relay device 2 and converted so as to be analyzable.

FIG. 2 is a functional block diagram showing an example of the central monitoring device 1. As shown in FIG.
The fire prevention system configured as described above comprises, as its functional means, a temperature detection means 20 for collecting temperature distribution data in the restricted area, an object detection means 21 for collecting object distribution data within the restricted area, a current detection means 22 for detecting current data of the current used in the restricted area, a measurement means 23 for extracting isothermal areas present in the restricted area from the temperature distribution data and deriving their position, shape and temperature, an information storage means 24 for retaining time-series information of the position, shape and temperature of the isothermal areas present in the restricted area, a classification means 25 for detecting and sorting the isothermal areas included in the restricted area using the position, shape and temperature of the isothermal areas as judgment factors, a determination means 26 for detecting fire precursor events in accordance with the classification, and an alarm means 27 for outputting fire warning information in response to a fire precursor event detected by the determination means 26.
The measuring means 23 in this example further extracts the contours of objects present in the security zone from the object distribution data, and derives their positions and shapes.

(Temperature detection, object detection, current detection)
The temperature detection means 20 includes the thermal camera 4 which detects temperature distribution data of the alert area from infrared rays emitted from objects or living things present in the alert area, and the relay device 2 to which the thermal camera 4 is connected.
The object detection means 21 includes an image pickup camera 5 that detects object distribution data consisting of the contours and brightness of objects, and the relay device 2 to which the image pickup camera 5 is connected.
The current detection means 22 includes a zero-phase-sequence current transformer 13 and the like for detecting current data of a power distribution line laid in a security zone, and the relay device 2 to which the zero-phase-sequence current transformer 13 and the like are connected.

<Measurement>
The measuring means 23 includes a control means which periodically collects temperature distribution data, object distribution data, and current data from the temperature detection means 20, the object detection means 21, and the current detection means 22, an image processing means (thermography) which converts the temperature distribution data detected by the thermal camera 4 into image data as a temperature distribution map such as a thermograph or a contour diagram (see Figures 4 and 5) attached to the detected position, and an analysis means which detects an identification code (area ID), position, contour, and temperature band (hereinafter collectively referred to as "temperature information") of an isothermal area appearing in the temperature distribution map, as well as the position and contour (hereinafter collectively referred to as "object information") of an object appearing in an on-site image obtained from the object distribution data, and derives edge image data in which the isothermal area or the contour of an object is displayed (divided into areas), and records the temperature distribution data, object distribution data, and edge image data, the temperature information, the object information, and the current data in the information storage means 24 as time-series information.

The measuring means 23 determines the contour of each isothermal area shown in the temperature distribution map based on the temperature distribution data and under a certain rule (threshold value, etc.) from the gradient of the distance-temperature change, etc. A unique identification code (area ID) is assigned to the temperature information of each isothermal area.
The isothermal zone is divided into a heat source 30 (see FIG. 5B) which generates heat itself and has the highest temperature and stable form in the area, a heat dissipation zone 31 around the heat source 30 which receives heat directly and where the temperature decreases uniformly away from the position of the heat source 30, and its intersection zone, a convection zone 32 where the atmosphere of the heat dissipation zone 31 has moved and where the temperature difference with adjacent isothermal zones is small, and a heat isolation zone 33 which is thermally isolated from other isothermal zones and where the temperature difference with adjacent isothermal zones is large.

On the other hand, the measuring means 23 can also add an element of dividing the area by the outer edge of the object placed in the security zone to the above-mentioned division by temperature. That is, based on the contour and brightness of the object distribution data collected by the imaging camera 5, a process is performed in which a physical partition such as the casing of the object is used as the contour of the isothermal area instead of an unclear contour of the isothermal area.

<Sorting process>
The classification means 25 classifies isothermal areas formed by objects and spaces (hereinafter referred to as "elements") in the alert zone according to their type, purpose, origin, etc. (cause of occurrence) every time the temperature information or object information is updated. The classification is performed by assigning a classification code that fits each isothermal area included in the temperature information.
In addition, identification codes (related IDs) of other isothermal regions related to the isothermal region may also be added.

The classification of isothermal regions by the classification means 25 is carried out in three stages based on "temperature range", "position" and "shape".
As a result of the sorting process at each stage, a sorting code consisting of a temperature code, a position code and a form code can be attached to each item (see FIG. 3).

The sorting means 25 in this example is provided with a sorting table that serves as a standard for the sorting process.
The sorting table is a data table in which common sense combinations of the "temperature band,""location," and "form" are given for existing components that can become hot.
The sorting process by the sorting means 25 is carried out by comparing with the sorting table.
The classification means 25 treats an isothermal region that fits into a combination present in the sorting table as one in which the identity (hereinafter, referred to as "attribute") of the component in the temperature information is generally clear.
On the other hand, if the result of the sorting process at each stage does not match the combination in the sorting table (if sorting is not possible), a sorting impossible code is added to the temperature information in the information storage means 24 as the attribute is unknown.

Examples of reasons why a product may be given the "unclassifiable" code because common sense attributes cannot be applied include:
(1) When there is an isothermal area (excluding a chimney shape) in the high temperature or medium temperature zone at a high altitude. (2) When the shape of the isothermal area in the high temperature or medium temperature zone is odd. (3) When the isothermal area in the high temperature or medium temperature zone is abnormally large or abnormally small in comparison with typical components. (4) When the temperature of an isothermal area having the shape of a typical cooking vessel (such as a pot) is in the high temperature zone.

(First sorting)
The first sorting process (primary sorting) of the isothermal area by the classification means 25 is performed by classifying the "temperature bands" detected from the isothermal area based on the temperature information into a high temperature band (250°C or higher), a medium temperature band (50°C to 250°C), and a low temperature band (less than 50°C), and assigning a temperature code specific to the corresponding temperature band.
Specifically, the temperature band generated by each isothermal area during operation is compared with a temperature table in which the temperature thresholds for the high temperature band, the medium temperature band, and the low temperature band are stored, the temperature band to which each belongs is assigned, and a temperature code for the assigned temperature band is given.

Examples of components of the isothermal zone that take on heat from the high temperature band during operation include the burner or heating wire of a cooking appliance, the burner, heating wire or wick of a heating appliance, the heating wire of a beauty appliance, or the light-emitting part of a lighting appliance.
Examples of components that are in the isothermal region and take on heat in the mid-temperature range during operation include cooking containers, heat exchange parts in air conditioning, coils or transformers in power supplies, and heat sinks in heating.
Examples of components of the isothermal area that take on the heat of the low temperature zone during operation include the convection area, the power plug, the power cord, and objects of caution that are increasing in temperature.
In addition, components whose temperature settings can be changed can be divided into a number of "temperature zones."

(Secondary sorting)
The second sorting process (secondary sorting) of the isothermal areas by the classification means 25 is performed by classifying the "position" where the isothermal area is detected based on the temperature information into a high position (ceiling level, etc.), a medium position (waist to chest level, etc.), a low position (floor level, etc.), etc., and assigning a position code specific to the corresponding position.
Specifically, the position where each isothermal area exists during operation is compared with a position table in which the high, medium, and low height thresholds are stored, and the position to which each area belongs is assigned.
Examples of components in the isothermal region that are heated at a high level include lighting equipment and air conditioning equipment.
Components in the isothermal region that are heated at a medium level include, for example, cooking equipment and beauty equipment.
Examples of components in the isothermal area that are heated at a low level include heating equipment, transformers, and power cords.
Additionally, people, convection zones, or thermal isolation zones may be separated into multiple "locations."

(Third sorting)
The third sorting process (tertiary sorting) of the isothermal areas by the classification means 25 is performed based on the temperature information by classifying the "shape" of the isothermal area into components such as animals (including humans), burners, heating wires, wicks, heat sinks, heat exchangers, light emitters, heat sources such as coils (cores) or conductors, cooking vessels such as pots or ovens for rice cookers, heaters such as grills or ovens, or heat dissipation areas or cooking vessels thereof, and assigning a shape code (fc: f1, f2, ... fn) specific to the component.
Specifically, the contours of each isothermal region are compared with a form table in which the basic form (shape and size) of the silhouette of the component is stored, and a component that has a certain amount of match (hereinafter referred to as "similarity") under appropriate enlargement or reduction is assigned.
On the other hand, if there are no "same" or "similar" components, the area is given an unsortable code as a convection area, a thermal isolation area, or other unsortable amorphous area.

<Determination process>
Upon completion of the sorting process for all isothermal regions in the alert area, the determining means 26 compares the latest temperature information, object information, and current data with existing data in a time series.
When comparing temperature bands, the judgment means 26 judges that the temperature band of a newly detected isothermal area is included in the temperature band allowed by the attributes assigned to the existing isothermal area in the sorting table (if it is suitable for sorting), and judges that the same isothermal area exists stably (is safe) under the conditions of positional agreement and "similarity" of shape.
In addition, the judgment means 26, in comparing the existing data with the newly detected isothermal area, will determine that the area is the same isothermal area for the time being if it satisfies at least two of the following three requirements: the area contains a position (including the ``position'' at the time of the previous sorting), there is a similarity in shape (a property that does not meet the ``similar'' criterion but has a certain degree of consistency that is close to the criterion), or the temperature range matches; and will determine any other isothermal area as a newly generated isothermal area.

The judgment means 26 detects isothermal areas (existing isothermal areas) that are recognized to have been detected in the past as the same isothermal area, and where a change in temperature, shape or position exceeding a certain amount that is not suitable for sorting has been observed (hereinafter referred to as a "denatured area"), or a newly generated isothermal area that has not been detected as the same isothermal area in the past for a certain period of time, and that cannot be sorted (hereinafter referred to as a "newly formed area").
If the temperature in the detected "denatured region" or "newly formed region" exceeds a so-called low-temperature ignition temperature, the determination means 26 outputs fire warning information as a fire precursor event. On the other hand, if the temperature is below the low-temperature ignition temperature, the determination means 26 outputs warning information by attaching a warning code to the isothermal region as a warning target.

If fire warning information is output by the judgment means 26 within a certain period of time (e.g., several tens of seconds to several minutes) immediately after the classification means 25 detects a person, fire warning information is further output indicating the presence of a criminal offense as a man-made fire precursor event.
The fire warning information for the fire precursor events can be, for example, a low ignition temperature (100°C to 150°C), a flash point temperature (220°C to 264°C), an ignition temperature (260°C to 416°C), and as the temperature increases, an emergency code indicating the degree of urgency of the fire precursor event ("low", "medium", "high") can be assigned (see Figure 3).

<Alarm processing>
The alarm issuing means 27 is composed of an alarm device, a processing device, and a control device that controls their operation, and upon receiving the caution information or fire caution information, causes the alarm device or processing device to perform an operation in accordance with the caution information or the emergency code.
The alarm device is, for example, a public institution 15 such as a fire department, a communication device that alerts the user's mobile terminal 14, an audio device that outputs fire warning information by sound such as a speaker 16, or an optical alarm device that outputs visual fire warning information such as a rotating light or flashing light, and the processing device is, for example, a circuit breaker for a supply circuit such as electricity, gas or kerosene, an automatic fire alarm system, a sprinkler system, a fire door, a fire shutter or a smoke exhaust machine.

[Embodiment Mode]
When the fire prevention system according to the present invention configured as described above is used in, for example, the dining-kitchen of an ordinary home, the thermal camera 4 and the image capturing camera 5 are installed so that the entire alert area of the dining-kitchen is captured in the field of view, and the zero-phase-sequence current transformer 13 is installed in the corresponding system of the distribution board before operation (see FIG. 6).
When the system is in operation, the measuring means 23 collects temperature distribution data, object distribution data and current data, and performs image processing and analysis.
Once the analysis and image processing are completed and the division of the alert area is completed, the classification means 25 performs a classification process.

Taking a heat source or heat dissipation area present in a room as an example, the following is an example of a three-stage sorting process based on temperature band, position and shape as an isothermal area.
FIG. 3 shows an example of sorting according to isothermal regions.
(1) The isothermal area with area ID: A1 is assigned the following characteristics: location code is “high”, temperature code is “low” and “medium” (30°C to 50°C), and shape code is f1 (aligned circular heat sources are visible), and attributes similar to lighting equipment (LED fluorescent lamp) are assigned to it.
(2) The isothermal area with area ID: A2 is assigned attributes similar to a cooking appliance (induction stove) with the characteristics of a location code of “medium”, a temperature code of “medium temperature” (90°C to 250°C), and a shape code of f2 (a neat cooking pot shape).
(3) The isothermal area with area ID: A3 has the characteristics of a location code of “medium”, a temperature code of “high temperature” (500°C to 1900°C), and a shape code of f3 (a neat burner shape and a cooking pot shape), and is assigned attributes similar to a cooking appliance (gas stove).
(4) The isothermal area with area ID: A4 has the characteristics of a location code of “medium”, a temperature code of “medium temperature” (90°C to 250°C), and a shape code of f4 (a neat heating wire shape or a plate shape), and is assigned attributes similar to a cooking appliance (a tabletop hot plate).
(5) The isothermal area with area ID A5 has the characteristics of a location code of “medium”, a temperature code of “medium temperature” (90°C to 250°C), and a shape code of f5 (smooth heating wire and bread shape), and is assigned attributes similar to a cooking appliance (toaster).
(6) The isothermal area with area ID A6 has the characteristics of a location code of “low”, a temperature code of “high” (300°C to 1000°C), and a shape code of f6 (a neat heating wire shape), and is therefore assigned attributes similar to a heating appliance (electric stove).

After sorting of all the isothermal regions in the alert zone has been completed, the determination means 26 performs a determination process.
The judgment process by the judgment means 26 compares the latest temperature information, object information, and current data with the latest information for a certain period of time, evaluates the degree of danger of the denatured areas and newly formed areas as areas requiring judgment, outputs caution information for objects of caution detected as a result of the evaluation, and outputs fire caution information for fire precursor events detected as a result of the evaluation, and at the same time issues a report of urgency based on the flammability and flammability of the temperature (see Figure 6).
Here, a "denatured region" that is considered to be particularly dangerous is an isothermal region in which an increasing change in "temperature" exceeding a certain amount (e.g., a temperature range allowed by an attribute) is observed, a change in "position" exceeding a certain amount (e.g., falling outside a position range allowed by an attribute) is observed, or a deformation in "shape" exceeding a certain amount (e.g., to the point of losing similarity) is observed.

For example, if the determination means 26 compares the latest temperature information, object information, and current data with existing time-series data for the most recent certain period and finds that the isothermal area of A3 has changed to "medium", "high temperature", or "unknown shape" (upward bulging), then since the outline of the shape deviates from the regular shapes of the burner and cooking pot (the similarity is lost), classification at this time is not possible and the object will not conform to the results of the previous classification process by the classification means 25.
Moreover, since the temperature band exceeds the ignition temperature, the determination means 26 determines that the occurrence of this isothermal region is a fire precursor event of extremely high urgency, and assigns an emergency code ("high level") to it.

On the other hand, when the determination means 26 compares the latest temperature information, object information, and current data with existing time-series data for the most recent certain period and finds that a new isothermal area A7 with a location code of "low", a temperature code of "high" and "medium" (100°C to 270°C), and an indistinguishable shape occurs in the vicinity of the isothermal area A6 some time after the occurrence of the isothermal area, the isothermal area A7 cannot be classified by the classification means 25 because of its indistinguishable shape. Moreover, because the temperature band exceeds the low-temperature ignition temperature, the determination means 26 determines the occurrence of this isothermal area to be a fire precursor event and assigns an emergency code ("low").
In the subsequent monitoring, as the temperature exceeds the low ignition temperature, the flash temperature, and the ignition temperature, the determining means 26 appropriately assigns an emergency code to the isothermal region, which code indicates the degree of urgency.

Furthermore, if the judgment means 26 compares the latest temperature information, object information, and current data with existing time-series data for a certain period of time and finds that an isothermal area with an irregular, meandering shape (unidentifiable) between 20°C and 40°C ("low temperature") occurs "below" the alert zone, there are no matching attributes in terms of location, temperature, and shape characteristics, so it becomes an object that cannot be classified by the classification process by the classification means 25. However, since the temperature does not reach the low-temperature ignition temperature, the judgment means 26 does not judge the occurrence of this isothermal area to be a fire precursor event, and assigns a warning code to the temperature information of the isothermal area indicating that it is a subject of caution.
Furthermore, if the temperature is medium or high and the current data indicates that excessive current is flowing in the alert area, the "irregular serpentine shape" suggests heating in the form of a power cable, and the event is determined to be a fire precursor.

1. Central monitoring device, 2. Relay device, 3. Local communication network,
4 Thermal camera, 5 Imaging camera, 6 Monitoring interface, 7 Display unit,
8 Operation unit, 9 Linkage interface, 10 Communication interface,
11 control unit, 12 memory unit, 13 zero-phase current transformer,
14 Mobile terminals, 15 Public institutions, 16 Speakers,
20 temperature detection means, 21 object detection means, 22 current detection means,
23 measuring means, 24 information storage means, 25 classification means,
26 Determination means, 27 Notification means,
30 heat source, 31 heat dissipation area, 32 convection area, 33 heat isolation area,

Claims (6)

A temperature detection means for collecting temperature distribution data of the alert area;
A measuring means for extracting isothermal regions existing in the warning zone from the temperature distribution data and deriving their temperature and shape;
A classification means for classifying the isothermal areas included in the warning zone based on the temperature and shape of the isothermal areas;
A determination means for detecting the occurrence of an isothermal region that cannot be classified as a fire precursor event;
A fire prevention system comprising an alarm means for outputting fire warning information in response to a fire precursor event detected by the determination means. An information storage means for storing time-series information on the temperature and shape of isothermal areas existing in the warning zone,
2. The fire prevention system according to claim 1, wherein said determination means detects fluctuations in temperature and shape of isothermal areas present in said alert zone that do not conform to classification as a fire precursor event. A temperature detection means for collecting temperature distribution data of the alert area;
A measuring means for extracting isothermal regions existing in the warning zone from the temperature distribution data and deriving their temperature, shape and position;
A classification means for classifying the isothermal areas included in the warning zone based on the temperature, shape and position of the isothermal areas as judgment factors;
A determination means for detecting the occurrence of an isothermal region that cannot be classified as a fire precursor event;
A fire prevention system comprising an alarm means for outputting fire warning information in response to a fire precursor event detected by the determination means. an information storage means for storing time-series information on the temperature, shape and location of isothermal areas existing in the warning zone;
4. The fire prevention system according to claim 3, wherein said determination means detects fluctuations in temperature, shape and position of isothermal areas existing in said alert zone that do not conform to classification as a fire precursor event. The classification means detects a person included in the warning zone using the temperature and shape of the isothermal area as judgment factors,
The fire prevention system according to any one of claims 1 to 4, characterized in that the determination means detects the occurrence of an isothermal area that cannot be sorted within a certain period of time after detecting a person in a warning area as a man-made fire precursor event. A current detection means is provided for detecting a current used in the alert area,
6. The fire prevention system according to claim 1, wherein the determination means detects a current exceeding a capacity of a warning area as a fire precursor event caused by an overcurrent.

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