JP7319410B2 - fire detection device - Google Patents

Description

The present invention relates to fire detection devices.

Conventionally, as one of the techniques for detecting a fire in a monitored area, an infrared thermography camera directly captures an image of the monitored area, detects events accompanying the fire based on the captured image, and uses this detection result. A technique has been proposed for determining the presence or absence of a fire based on this (see, for example, Patent Literature 1).

JP 2017-167616 A

Here, in the above-described conventional technology, as described above, the surveillance area is directly imaged by an imaging device such as an infrared thermography camera. There was a possibility that it would be difficult to widen the range in which fires can be detected. Therefore, there is room for improvement from the viewpoint of improving fire detection performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fire detection apparatus capable of improving fire detection performance.

In order to solve the above-mentioned problems and achieve the object, the fire detection device according to claim 1 is a fire detection device for detecting fire in a monitoring area, and capable of displaying the monitoring area. A reflecting mirror installed movably or immovably at a position, the reflecting surface of the reflecting mirror having a predetermined curvature, and imaging means fixed at a position near the reflecting mirror, imaging means for imaging the monitoring area projected on the reflecting surface of the reflecting mirror; and determination means for determining the presence or absence of the fire based on a plurality of images captured by the imaging means. wherein the imaging means is configured to be capable of imaging the plurality of captured images having light wavelengths different from each other, and the determination means captures a portion of the plurality of captured images captured by the imaging means. A first incident portion, which is a portion of the image and the amount of incident light with respect to the light wavelength is equal to or greater than a first threshold value, is specified, and among the plurality of captured images captured by the imaging means, another part of the captured image is specified. Identifying a second incidence portion, which is a portion of the captured image where the incident amount with respect to the light wavelength is equal to or greater than a second threshold value, and determining whether or not the first incidence portion overlaps with the second incidence portion. , it is determined that the fire has been detected if the overlap does not occur, and that the fire has not been detected if the overlap occurs.

The fire detection device according to claim 2 is the fire detection device according to claim 1, wherein the light wavelength of the part of the captured image is an infrared wavelength, and the light wavelength of the other part of the captured image is is the wavelength of visible light.

Claim 3 is a fire detection device according to claim 1 or 2, wherein the fire detection device specifies the position of the fire based on the plurality of captured images captured by the imaging means. identifying means, wherein the fire position identifying means identifies a first incidence portion that does not overlap with the second incidence portion among the first incidence portions, extracts the coordinates of the identified first incidence portion;
The extracted coordinates are specified as the position of the fire to be specified.

According to the fire detection device of claim 1, the reflecting mirror is installed movably or immovably at a position capable of projecting the monitored area, and the reflecting surface of the reflecting mirror has a predetermined curvature. an image capturing means fixed near the reflecting mirror for capturing an image of a monitoring area reflected on the reflecting surface of the reflecting mirror; and an image captured by the image capturing means. and a judgment means for judging whether or not there is a fire based on the image pickup means, compared to the conventional technology (technology for detecting a fire based on an image directly picked up by an image pickup device). The range that can be imaged can be expanded, and fire can be detected in a wide range. Therefore, it is possible to improve the fire detection performance.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows notionally the fire detection apparatus which concerns on embodiment. FIG. 10 is a diagram showing a first extended imaging field-of-view range; 1 is a block diagram showing an electrical configuration of a fire detection device; FIG. It is a figure which shows the structural example of a threshold value table. 4 is a flowchart of fire detection processing according to the embodiment; 6 is a flowchart of initial setting processing; FIG. 2 is a diagram showing an overview of image processing, in which (a) is a diagram showing a captured image before image processing is performed, (b) is a diagram showing a captured image to which coordinates are assigned, and (c) is a flattened image. FIG. 10 is a diagram showing a captured image obtained by the imaging; It is a diagram showing the characteristics of various types of light, in which the horizontal axis indicates the light wavelength and the vertical axis indicates the relative value of the amount of radiation. It is a figure which shows the modification of a fire detection apparatus, (a) is a right view, (b) is a bottom view.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a fire detection device according to the present invention will be described in detail below with reference to the drawings. First, [I] the basic concept of the embodiment will be explained, then [II] the specific contents of the embodiment will be explained, and finally [III] modifications of the embodiment will be explained. However, the present invention is not limited by the embodiment.

[I] Basic concept of the embodiment First, the basic concept of the embodiment will be described. Embodiments generally relate to a fire detection apparatus for detecting and announcing a fire in a monitored area.

Here, the "monitoring area" is an area to be monitored, and is a concept including, for example, an area inside a building, an area outside the building, etc. Described as a region. In addition, although the specific structure and type of "building" is arbitrary, for example, detached houses, collective housing such as apartments and condominiums, office buildings, event facilities, commercial facilities, public facilities, factory facilities, etc. It is a concept that includes In addition, "notify" is a concept including, for example, outputting predetermined information to an external device, displaying or outputting predetermined information via output means (display means or audio output means), etc. be.

[II] Specific contents of the embodiment Next, specific contents of the embodiment will be described.

(composition)
First, the configuration of the fire detection device according to the embodiment will be described. FIG. 1 is a perspective view conceptually showing a fire detection device according to an embodiment. FIG. 2 is a diagram showing a first expanded field-of-view range, which will be described later. FIG. 3 is a block diagram showing the electrical configuration of the fire detection device. In the following description, the X direction in FIG. 1 is the left-right direction of the fire detection device (+X direction is the left direction of the fire detection device, -X direction is the right direction of the fire detection device), and the Y direction in FIG. 1 is the fire detection device. The front and back direction (+Y direction is the front direction of the fire detection device, -Y direction is the rear direction of the fire detection device), the Z direction in FIG. The direction is referred to as the downward direction of the fire detector).

As shown in FIG. 1, the fire detection device 1 is installed outside the building on the wall 2 of the building (for example, the upper part of the wall 2, etc.). , the reflecting mirror 12, the first imaging section 13, the second imaging section 14, and the control unit 20 are integrally housed. As for the connection form of each component, as shown in FIG. 1, the control unit 20 is electrically connected to each of the first imaging section 13 and the second imaging section 14 via wiring 4 .

(Configuration - chassis)
The housing 11 is a basic structure of the fire detection device 1, and is protective means for protecting the reflecting mirror 12, the first imaging section 13, the second imaging section 14, and the control unit 20 from the outside. The housing 11 is a hollow cylindrical body made of, for example, a metal material, and is large enough to accommodate the reflecting mirror 12, the first imaging section 13, the second imaging section 14, and the control unit 20. , and is fixed to the wall 2 by a fixture or the like, as shown in FIG.

Further, as shown in FIG. 1, the housing 11 is provided with an opening 11a. The opening 11a is an opening that allows the monitoring area 3 to be reflected on the reflecting mirror 12. As shown in FIG. ing.

(Construction-Reflector)
A reflecting mirror 12 is a mirror for reflecting the monitored area 3 . The reflecting mirror 12 is configured using, for example, a known mirror (a convex mirror as an example) in which at least a part of the reflecting surface of the reflecting mirror 12 is convex. The surface is arranged at a position where the monitoring area 3 can be projected, and is fixed to the housing 11 by a fixture or the like (that is, installed immovably). Further, the radius of curvature of the reflecting surface of the reflecting mirror 12 is arbitrary, but in the embodiment, it is set to a length that can secure a first extended imaging field of view range ER1 and a second extended imaging field of view range, which will be described later. For example, the radius of curvature may be set to approximately 160 mm.

(Configuration-first imaging unit)
Returning to FIG. 1 , the first imaging unit 13 is imaging means for imaging the monitoring area 3 projected on the convex portion of the reflecting surface of the reflecting mirror 12 . The first imaging unit 13 is configured using, for example, a known thermal image imaging device (eg, an infrared thermography camera, etc.), and is arranged near the reflecting mirror 12 as shown in FIGS. It is fixed to the housing 11 by fixtures or the like.

In addition, although the installation method of the first imaging unit 13 is arbitrary, in the embodiment, as shown in FIG. It is set apart from the reflecting mirror 12 by a predetermined distance and at a predetermined angle with respect to the reflecting mirror 12 so as to include the monitoring area 3 projected in the portion imaged by 13 (the second imaging unit 14). Here, the “first extended imaging visual field range ER1” means that the imaging visual field range R1 of the first imaging unit 13 (specifically, the horizontal imaging visual field range and the vertical imaging visual field range) is extended by the reflecting mirror 12. Denotes extended range. The first extended imaging field-of-view range ER1 is set to be wider than the imaging field-of-view range R1 of the first imaging unit 13. For example, at least the horizontal range of the first extended imaging field-of-view range ER1 is set to the first range. It may be set to about 1.5 times the imaging visual field range R1 of the imaging unit 13 . Further, the predetermined distance and the predetermined angle may differ according to, for example, the radius of curvature of the reflecting mirror 12, the range of the monitoring area 3, etc., and are therefore set based on experimental results. The predetermined distance may be set to about 20 cm, and the predetermined angle may be set upward by about 30° with respect to the reflecting mirror 12 .

With such a configuration of the first imaging unit 13, the range that can be imaged by the first imaging unit 13 can be expanded compared to the case where the monitoring area 3 is imaged in the imaging visual field range R1 of the first imaging unit 13. It is possible to widen the range in which fire can be detected.

(Configuration-Second Imaging Unit)
Returning to FIG. 1 , the second imaging section 14 is imaging means for imaging the monitoring area 3 projected on the convex portion of the reflecting surface of the reflecting mirror 12 . In the embodiment, the second imaging unit 14 is such that the light wavelength of the captured image captured by the second imaging unit 14 (hereinafter referred to as “second captured image”) is captured by the first imaging unit 13. is configured using an imaging device capable of imaging so as to be different from the light wavelength of the captured image (hereinafter referred to as “first captured image”) that is captured, for example, a known imaging device for visible light images (an example as a visible light imaging CCD camera, etc.), and as shown in FIG.

In addition, although the installation method of the second imaging unit 14 is arbitrary, in the embodiment, substantially the same as the installation method of the first imaging unit 13, the second extended imaging visual field range is the convex portion of the reflecting surface. It is set apart from the reflecting mirror 12 by a predetermined distance and at a predetermined angle with respect to the reflecting mirror 12 so as to include the monitoring area 3 that is imaged by the second imaging unit 14 . Here, the “second extended imaging visual field range” means that the imaging visual field range of the second imaging unit 14 (specifically, the horizontal imaging visual field range and the vertical imaging visual field range) is extended by the reflector 12 . In the embodiment, it is set substantially the same as the first extended imaging field of view range ER1.

With such a configuration of the second imaging unit 14, the range that can be imaged by the second imaging unit 14 can be expanded compared to the case where the monitoring area 3 is imaged within the imaging field range of the second imaging unit 14. It is possible to widen the range in which fire can be detected.

(Configuration - control unit)
The control unit 20 is a unit for controlling the fire detection device 1, and as shown in FIG. ing.

(Configuration - control unit - operation section)
The operation unit 21 is operation means for receiving operation input to the fire detection device 1 .

(Configuration - control unit - communication section)
The communication unit 22 is communication means for communicating with an external device (for example, a receiver, etc.).

(Configuration - control unit - power supply)
The power supply unit 23 is power supply means for supplying electric power supplied from a commercial power supply (or an external device) to each unit of the fire detection apparatus 1 .

(Configuration - control unit - control section)
The control unit 24 is control means for controlling the fire detection device 1 . Specifically, the control unit 24 includes a CPU, various programs interpreted and executed on the CPU (including a basic control program such as an OS, and an application program that is started on the OS and realizes a specific function) and programs It is a computer configured with an internal memory such as a RAM for storing various data.

Further, as shown in FIG. 3, the control unit 24 functionally conceptually includes a determination unit 24a, a threshold value identification unit 24b, a fire position identification unit 24c, and a notification unit 24d.

The determination unit 24a is determination means for determining whether or not there is a fire based on the first captured image captured by the first imaging unit 13 or the second captured image captured by the second imaging unit 14 .

The threshold identification unit 24b selects first threshold information or second threshold information (described later) corresponding to the curvature of the reflecting mirror 12 provided in the fire detection device 1 among the threshold information stored in the threshold table 25a (described later). It is a threshold specifying means for specifying information.

The fire position specifying unit 24c is fire position specifying means for specifying the position of the fire based on the first captured image or the second captured image captured by the first imaging unit 13 or the second imaging unit 14 .

The reporting unit 24d is reporting means for reporting the position of the fire specified by the fire position specifying unit 24c. Details of the processing executed by the control unit 24 will be described later.

(Configuration-control unit-storage unit)
The storage unit 25 is storage means for storing programs and various data necessary for the operation of the fire detection device 1 . The storage unit 25 is configured using a rewritable recording medium, and can use, for example, a non-volatile recording medium such as a flash memory.

Further, the storage unit 25 has a threshold table 25a as shown in FIG.

(Configuration-control unit-storage unit-threshold table)
The threshold table 25a is correction information storage means for storing first threshold information and second threshold information. Here, the “first threshold information” is threshold information indicating the first threshold for determining the presence or absence of fire based on the first captured image. "Second threshold information" is threshold information indicating a second threshold for determining the presence or absence of fire based on the second captured image.

FIG. 4 is a diagram showing a configuration example of the threshold table 25a. As shown in FIG. 4, the threshold table 25a is configured by mutually associating the item "curvature", the item "first threshold", the item "second threshold", and the information corresponding to each item. . Here, the information corresponding to the item "curvature" is information indicating the curvature of the reflecting mirror 12 (hereinafter referred to as "curvature information"). , “200 mm”, “300 mm”, and the like. Further, the information corresponding to the item "first threshold" is the first threshold information, for example, the first thresholds "T11", "T12", "T13", "T14", etc. shown in FIG. (Here, for convenience of explanation, the first threshold is described as "T11" to "T14", but actually numerical values are stored. The same applies to the "second threshold" in FIG. ). The information corresponding to the item "second threshold" is the second threshold information, and for example, the second thresholds "T21", "T22", "T23", "T24", etc. shown in FIG. do.

(Fire detection processing)
Next, fire detection processing executed by the fire detection device 1 configured as described above will be described. FIG. 5 is a flowchart of fire detection processing according to the embodiment (steps are abbreviated as "S" in the following description of each processing). The fire detection process is roughly a process of detecting a fire in the monitoring area 3 . The timing of executing this fire detection process is arbitrary, but in the embodiment, it is assumed that the fire detection process is started after the power of the fire detection device 1 is turned on.

When the fire detection process is started, as shown in FIG. 5, the control unit 24 starts the initial setting process at SA1.

(Fire detection processing - initial setting processing)
Next, the initial setting process of SA1 in FIG. 5 will be described. FIG. 6 is a flowchart of initial setting processing. The initial setting process is a process for initializing the fire detection process.

As shown in FIG. 6, at SB1, the control unit 24 determines whether or not the radius of curvature of the reflecting mirror 12 provided in the fire detection device 1 has been obtained. Any method can be used to acquire the radius of curvature. The received information (or the received information) is set as the radius of curvature to be acquired. Then, the control unit 24 waits until the radius of curvature is acquired (SB1, No), and proceeds to SB2 when the radius of curvature is acquired (SB1, Yes).

At SB2, the control unit 24 receives an instruction (hereinafter referred to as a "comparison instruction") to detect the presence or absence of a fire based on the first captured image and the second captured image at SA5, which will be described later, via the operation unit 21. determine whether or not Then, when the comparison instruction is accepted (SB2, Yes), the control unit 24 sets an instruction flag indicating the comparison instruction (the initial value of this instruction flag is a state in which it is not set). and stored in the storage unit 25), the process proceeds to SB3. On the other hand, if the comparison instruction is not accepted (SB2, No), the process proceeds to SB4 without setting the instruction flag.

At SB3, the threshold identification unit 24b selects the first threshold information and the second threshold information corresponding to the curvature of the reflecting mirror 12 acquired at SB1 from among the first threshold information and the second threshold information stored in the threshold table 25a. Identify the information and then terminate the initialization process.

At SB4, the threshold specifying unit 24b specifies the first threshold information corresponding to the curvature of the reflecting mirror 12 acquired at SB1 among the first threshold information stored in the threshold table 25a, and then performs the initial setting process. finish.

Returning to FIG. 5, at SA2, the control unit 24 determines whether or not the timing for detecting a fire (hereinafter referred to as "detection timing") has arrived. The method of determining whether or not this detection timing has arrived is arbitrary, but for example, determination is made based on whether or not a predetermined operation has been accepted via the operation unit 21, or after the processing of SA1 is completed. It is determined based on whether or not a predetermined time has passed. Here, if the predetermined operation is accepted or the predetermined time has elapsed, it is determined that the detection timing has arrived, and if the predetermined operation has not been accepted and the predetermined time has not elapsed, determines that the detection timing has not arrived. Then, the control unit 24 waits until the detection timing arrives (SA2, No), and when it is determined that the detection timing has arrived (SA2, Yes), the process proceeds to SA3.

At SA3, the control unit 24 executes imaging processing. Here, the “imaging process” means a process of imaging the monitoring area 3 by the first imaging unit 13 or the second imaging unit 14 . In addition, although the content of the imaging process is arbitrary, in the embodiment, if the instruction flag is not set in SA1, only the first imaging unit 13 captures the monitoring area 3 at a predetermined imaging interval (for example, , 5 sec, etc.) (or may be continuously imaged). On the other hand, when the instruction flag is set in SA1, the first imaging unit 13 and the second imaging unit 14 are caused to image the monitoring area 3 at the predetermined imaging interval.

At SA4, the control unit 24 executes image processing. Here, "image processing" is processing for correcting the first captured image or the second captured image captured in SA3.

Also, the execution method of this image processing is arbitrary, but in the embodiment, it is as follows. 7A and 7B are diagrams showing an overview of image processing, in which (a) is a diagram showing a captured image before image processing is performed, (b) is a diagram showing a captured image to which coordinates are assigned, and (c) ) is a diagram showing a flattened captured image. Since the image processing for the first captured image and the image processing for the second captured image are substantially the same, only the image processing for the first captured image will be described below.

That is, first, as shown in FIG. 7B, coordinates (specifically, are X coordinates and Y coordinates, which are indicated by mesh lines in FIG. 7B). Next, as shown in FIG. 7C, the first captured image to which the coordinates have been assigned is planarized using a predetermined planarization method. Further, using a known image analysis method, the coordinates of the first captured image are corrected based on the adjustment amount of the image accompanying flattening of the first captured image. By such processing, the first captured image or the second captured image captured in SA3 can be planarized, and the planarized first captured image or the second captured image is directly captured by the imaging device. It is possible to handle it in substantially the same way as a captured image.

Returning to FIG. 5, at SA5, the determination unit 24a determines the first captured image or the second captured image captured at SA3, the first threshold of the first threshold information or the second threshold of the second threshold information specified at SA1. The presence or absence of a fire is determined based on 2 thresholds.

Here, the method for determining the presence or absence of fire is arbitrary, but in the embodiment, it is as follows. FIG. 8 is a diagram showing the characteristics of various types of light, with the horizontal axis representing the light wavelength and the vertical axis representing the relative value of the amount of radiation.

That is, when the instruction flag is not set in SA1, the incident amount of the first captured image captured in SA3 with respect to a predetermined light wavelength (for example, 4.5 μm) is the first threshold specified in SA1. It is determined whether or not the information is greater than or equal to the first threshold, and if it is greater than or equal to the first threshold, it is determined that a fire has been detected, and if it is less than the first threshold, it is determined that no fire has been detected. judge. However, not limited to this, for example, when determining the presence or absence of a fire using a plurality of first captured images captured in SA3, the first captured image determined to have detected a fire among the plurality of first captured images A fire is detected when the number of captured images in one image is equal to or greater than a predetermined number, and when the incident amount of the predetermined light wavelength in the first captured image when the fire is determined fluctuates by about several Hz. If it is less than the predetermined number, or if there is no fluctuation of about several Hz, it may be determined that no fire has been detected (it should be noted that when the instruction flag is set in SA1 It may also be applied to the method for judging the presence or absence of fire).

Further, when the instruction flag is set in SA1, the incident amount of the first captured image captured in SA3 with respect to the predetermined light wavelength is equal to or greater than the first threshold of the first threshold information specified in SA1. Determine whether or not there is Here, when it is equal to or greater than the first threshold, a portion of the first captured image where the incident amount with respect to the predetermined light wavelength is equal to or greater than the first threshold (hereinafter referred to as "first incident portion"). identify. Next, it is determined whether or not the incident amount of the second captured image captured in SA3 with respect to a predetermined light wavelength (for example, 0.4 μm) is equal to or greater than the second threshold of the second threshold information specified in SA1. do. Here, if it is less than the second threshold, it is determined that a fire has been detected. A portion that is equal to or greater than the second threshold (hereinafter referred to as “second incident portion”) is specified. Then, it is determined whether or not all of the identified first incident portions overlap with the identified second incident portions, and if they do not overlap, it is determined that a fire has been detected, and if they overlap, a fire is detected. is not detected. On the other hand, if it is less than the first threshold, it is determined that no fire has been detected. As described above, the presence or absence of a fire can be determined by selectively using the first captured image and the second captured image depending on whether or not the instruction flag is set. can be done. In particular, when determining whether or not there is a fire using both the first captured image and the second captured image, as shown in FIG. Specifically, the peak value of the first captured image is due to the amount of incident light from a high-temperature object such as a flame, and the peak value of the second captured image is due to the amount of incident light from sunlight, etc.). can be determined accurately.

If it is determined that no fire has been detected (SA5, No), the determination unit 24a proceeds to SA3, and if it is determined that a fire has been detected (SA5, Yes), the determination unit 24a proceeds to SA6. .

At SA6, the fire position identifying unit 24c identifies the position of the fire based on the first captured image or the second captured image captured at SA3. Here, the method of specifying the position of the fire is arbitrary, but in the embodiment, it is as follows.

That is, when the instruction flag is not set in the processing of SA1, the first incident portion is specified from the first captured image captured in SA3, the coordinates of the specified first incident portion are extracted, and the The extracted coordinates are specified as the position of the fire to be specified.

Further, when the instruction flag is set in the processing of SA1, a first incident portion that does not overlap with the second incident portion is specified among the first incident portions specified in SA5, and the specified first incident portion Coordinates are extracted, and the extracted coordinates are identified as the position of the fire to be identified. As described above, the position of the fire can be specified by selectively using the first captured image and the second captured image depending on whether the instruction flag is set, and the position of the fire can be determined according to the needs of the administrator. It becomes possible to specify.

At SA7, the notification unit 24d executes notification processing. Here, the "notification process" means the process of notifying that a fire has been detected in SA5 and the position of the fire specified in SA6. Specifically, the notification unit 24d transmits a signal (hereinafter referred to as a "fire signal") including information indicating that a fire has been detected in SA5 and information indicating the location of the fire specified in SA6. Output to an external device. As a result, the fact that a fire has been detected and the position of the fire can be notified to the external device, and convenience for the administrator in detecting the fire can be improved. Specifically, when the external device is a receiver, it is possible to perform fire extinguishing processing by a predetermined fire extinguishing equipment based on the fire signal input from the fire detection device 1 .

However, the processing is not limited to the processing described above, and other processing may be performed. For example, when the cycle of processing from SA3 to SA8 is repeated a plurality of times until the end timing of SA8, which will be described later, is reached, after it is determined that a fire has been detected in SA5 of a predetermined cycle, the external device outputs a fire signal. , but a fire is detected more than a predetermined number of times within a predetermined time in SA5 of the subsequent cycle, and the same fire position or a position in the vicinity thereof is specified more than once in SA6 of the subsequent cycle, fire signal may be output. Such processing can prevent erroneous detection of fire, and can further improve the accuracy of fire detection.

At SA8, the control unit 24 determines whether or not the timing for ending the fire detection process (hereinafter referred to as "end timing") has arrived. The method of determining whether or not this end timing has come is arbitrary, but for example, determination is made based on whether or not a predetermined operation has been performed by the administrator via the operation unit 21, or a restoration signal is received from an external device. is received, and if the predetermined operation is performed or the restoration signal is received, it is determined that the end timing has arrived, and if the predetermined operation is not performed and the restoration If no signal has been received, it is determined that the end timing has not arrived. Then, when it is determined that the end timing has not arrived (SA8, No), the control unit 24 shifts to SA3, and thereafter repeats the cycle of processing from SA3 to SA8 in the same manner. On the other hand, if it is determined that the end timing has arrived (SA8, Yes), the fire detection process is terminated.

With such a fire detection process, the first imaging unit 13 or the second imaging unit 14 can detect the The range that can be imaged can be expanded, and fire can be detected in a wide range. Therefore, it is possible to improve the fire detection performance. Further, in SA5, based on the first captured image or the second captured image captured in SA3 and the first threshold of the first threshold information or the second threshold of the second threshold information specified in SA1, the fire Therefore, the presence or absence of fire can be determined using a threshold corresponding to the curvature of the reflecting mirror 12 provided in the fire detection device 1, and the fire detection accuracy can be improved.

(Effect of Embodiment)
As described above, according to the embodiment, the reflecting mirror 12 is installed movably or immovably at a position capable of projecting the monitoring area 3, and at least part of the reflecting surface of the reflecting mirror 12 is A first reflecting mirror 12 having a convex shape and an imaging means fixed near the reflecting mirror 12 for capturing an image of the monitoring area 3 reflected by the convex portion of the reflecting surface of the reflecting mirror 12 . Since it includes the imaging unit 13 and the second imaging unit 14, and the determination unit 24a that determines the presence or absence of a fire based on the captured image captured by the first imaging unit 13 or the second imaging unit 14, the conventional The range that can be imaged by the first imaging unit 13 or the second imaging unit 14 can be expanded compared to the technology (technology for detecting a fire based on an image directly captured by an imaging device). , fire detection can be performed extensively. Therefore, it is possible to improve the fire detection performance.

Further, among the first threshold information or the second threshold information stored in the threshold table 25a, the first threshold information or the second threshold information corresponding to the curvature of the reflecting mirror 12 provided in the fire detection device 1 is selected. The determination unit 24a determines whether the captured image captured by the imaging means and the first threshold of the first threshold information or the second threshold of the second threshold information specified by the threshold identification means Therefore, the presence or absence of fire can be determined using a threshold corresponding to the curvature of the reflecting mirror 12 provided in the fire detection device 1, and the fire detection accuracy can be improved.

Further, since the reporting unit 24d for reporting the position of the fire specified by the fire position specifying unit 24c is provided, the position of the fire can be reported to an external device, and the user's convenience in detecting the fire is improved. can be improved.

[III] Modifications to the Embodiments Although the embodiments according to the present invention have been described above, specific configurations and means of the present invention are within the scope of the technical ideas of each invention described in the claims. In can be optionally modified and improved. Such modifications will be described below.

(Problem to be solved and effect of invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the contents described above, and may differ depending on the details of the implementation environment and configuration of the invention. or only part of the effects described above.

(Regarding decentralization and integration)
Also, each electrical component described above is functionally conceptual, and does not necessarily need to be physically configured as illustrated. In other words, the specific forms of distribution and integration of each part are not limited to those illustrated, and all or part of them can be functionally or physically distributed or integrated in arbitrary units according to various loads and usage conditions. can be configured as In addition, the term "device" in the present application is not limited to one configured by a single device, but includes one configured by a plurality of devices. For example, the fire detection device 1 is distributed to a plurality of devices configured to be able to communicate with each other, and the control unit 24 is provided in some of these devices, and another part of these devices may be provided with the storage unit 25 .

(About fire detection device)
In the above embodiment, the fire detection device 1 is provided with the housing 11. However, the present invention is not limited to this. For example, when the fire detection device 1 is installed inside a building, the housing 11 May be omitted.

Further, in the above embodiment, the fire detection device 1 has been described as including the first imaging unit 13 and the second imaging unit 14. However, the present invention is not limited to this. Only one of the portions 14 may be provided. In this case, if only the second imaging unit 14 is provided, the presence or absence of fire is determined based on the second captured image in SA5 of the fire detection process, and based on the second captured image in SA6 of the fire detection process. may be used to locate the fire. Furthermore, SB2 to SB4 of the initial setting process may be omitted. Further, when only the first imaging unit 13 is provided, the first imaging unit 13 is a plurality of transmission filters (for example, transmission filters that transmit light wavelengths = 3.5 μm, 4.5 μm, and 5.5 μm). , transmission filters that transmit only different light wavelengths, and switching means for switching between these transmission filters. Then, an image may be captured using each transmission filter in SA3 of the fire detection process, and the presence or absence of a fire may be determined based on the captured image corresponding to the transmission filter in SA5 (the second imaging unit 14 The same shall apply to the case where only the Accordingly, even when only one imaging unit is provided, it is possible to determine the presence or absence of a fire based on the captured images of a plurality of different light wavelengths, thereby improving the fire detection accuracy.

Further, in the above-described embodiment, the fire detection device 1 includes the threshold specifying unit 24b and the threshold table 25a. If the storage unit 25 stores the first threshold value and the second threshold value in advance, the threshold specifying unit 24b and the threshold table 25a may be omitted. In this case, SB1, SB3, and SB4 of the initial setting process may be omitted.

Further, in the above-described embodiment, the fire detection device 1 includes the fire position specifying section 24c. However, the fire position specifying section 24c may be omitted. In this case, SA6 of the fire detection process may be omitted.

(About shooting means)
In the above embodiments, the infrared thermography camera and the CCD camera for visible light images are used as the photographing means, but the present invention is not limited to this. For example, infrared thermography cameras and near-infrared cameras may be used. As a result, the near-infrared region of sunlight or the like becomes strong, so that it is possible to accurately distinguish between noise and fire.

(About reflector)
Although the said embodiment demonstrated that the reflective mirror 12 was immovably installed, it is not restricted to this, for example, the reflective mirror 12 may be installed movably. In this case, the fire detection device 1 is provided with turning driving means (for example, a known turning motor or the like) for turning the reflecting mirror 12 horizontally or vertically, and the turning driving means turns the reflecting mirror 12 horizontally. Or it may rotate continuously or intermittently around the vertical. As a result, the range that can be captured by the first imaging unit 13 or the second imaging unit 14 can be expanded compared to the case where the reflecting mirror 12 is immovably installed, and the fire can be detected in a wide range. be able to.

Moreover, although the said embodiment demonstrated that the reflecting mirror 12 was a spherical mirror, it is not restricted to this. 9A and 9B are diagrams showing a modification of the fire detection device 1, where (a) is a right side view and (b) is a bottom view. For example, the reflecting mirror 12 may be a spherical mirror, a reflecting mirror for 360° imaging, a reflecting mirror whose reflecting surface is partially convex, or the like. Alternatively, as shown in FIG. 9, reflector 12 may be a conical mirror. In this case, as shown in FIG. 9, the first reflecting mirror 12 is fixed to the wall portion 2 via the first fixing portion 31 of the fixing member 30, and the first imaging portion 13 (or the first imaging portion 13). 2 imaging unit 14) is disposed directly below the first reflecting mirror 12, and is connected to the second fixing portion 32 of the fixing member 30 (connected to the first fixing portion 31 via the connecting portion 33 in FIG. 8). It may be fixed to the wall portion 2 via the . For example, when the first imaging unit 13 in FIG. 9 captures an image of the reflecting surface of the reflector 12, the reflecting surface is divided into an imaging portion 12a to be imaged and a non-imaging portion 12b not to be imaged. You may

(About the threshold table)
In the above-described embodiment, the threshold table 25a stores the curvature information, the first threshold information, and the second threshold information in association with each other. The information indicating the distortion of the mirror 12, the first threshold information, and the second threshold information may be associated with each other and stored.

(About fire detection processing)
In the above embodiment, when the cycle of processing from SA3 to SA8 is repeated a plurality of times, in SA3, the first imaging unit 13 or the second imaging unit 14 scans the monitoring area 3 in a predetermined Although it has been described that images are captured at the image capturing interval, the present invention is not limited to this. For example, the imaging interval of the first imaging unit 13 or the second imaging unit 14 is set based on the determination result of SA5, and the first captured image or the An imaging control means for capturing the second captured image may be provided. Thereby, the first captured image or the second captured image can be captured according to the situation of the monitoring area 3 . Therefore, for example, when a fire is detected in SA5, the imaging interval after the fire is detected is set shorter than the imaging interval before the fire is detected, and the first imaging is performed at the set imaging interval. The image or the second captured image can be captured, and the presence or absence of fire can be determined more accurately.

Further, in the above-described embodiment, it has been described that the fire signal is output to the external device at SA7, but the present invention is not limited to this. For example, the fire detection device 1 has an output means (for example, a display means or an audio output means), and the output means indicates information indicating that a fire has been detected at SA5 and the position of the fire specified at SA6. Information may be displayed or output as audio.

(Appendix)
The fire detection device according to Supplementary Note 1 is a fire detection device for detecting and reporting a fire in a monitoring area, and is movable to a position where the monitoring area can be projected. A reflecting mirror installed in a target or immovable manner, wherein at least a part of the reflecting surface of the reflecting mirror is convex, and an imaging means fixed in the vicinity of the reflecting mirror, imaging means for imaging the monitoring area projected on the convex portion of the reflecting surface of the reflecting mirror; and determination means for determining the presence or absence of the fire based on the imaged image captured by the imaging means. and provided.

Further, in the fire detection device of Supplementary Note 2, in the fire detection device of Supplementary Note 1, the curvature information indicating the curvature of the reflecting mirror and the threshold information indicating the threshold for determining the presence or absence of fire are associated with each other and stored. threshold information storage means for specifying the threshold information corresponding to the curvature of the reflecting mirror provided in the fire detection apparatus among the threshold information stored in the threshold information storage means; , wherein the determination means determines the presence or absence of the fire based on the captured image captured by the imaging means and the threshold of the threshold information specified by the threshold specifying means.

Further, in the fire detection device according to Supplementary Note 3, in the fire detection device according to Supplementary Note 2, based on the captured image captured by the imaging means, the fire detection device specifies a position of the fire; and reporting means for reporting the position of the fire specified by the method.

Further, in the fire detection apparatus according to appendix 4, in the fire detection apparatus according to appendix 3, the imaging interval of the imaging unit is set based on the determination result of the determination unit, and the imaging unit at the set imaging interval and an imaging control means for capturing the captured image.

(Effect of Supplementary Note)
According to the fire detection device described in Supplementary Note 1, the reflecting mirror is movably or immovably installed at a position capable of projecting the surveillance area, and at least a part of the reflecting surface of the reflecting mirror is convex. an imaging means fixed in the vicinity of the reflecting mirror for imaging a surveillance area projected on the convex portion of the reflecting surface of the reflecting mirror; and determination means for determining the presence or absence of fire based on the captured image captured by the conventional technology (technology for detecting fire based on the image directly captured by the imaging device). In comparison, the range that can be imaged by the imaging means can be expanded, and fire detection can be performed over a wide range. Therefore, it is possible to improve the fire detection performance.

According to the fire detection device described in Supplementary Note 2, the threshold identification means for identifying the threshold information corresponding to the curvature of the reflecting mirror provided in the fire detection device among the threshold information stored in the threshold information storage means. and the determining means determines whether or not there is a fire based on the captured image captured by the imaging means and the threshold of the threshold information specified by the threshold specifying means. The presence or absence of fire can be determined using a threshold corresponding to the curvature of the reflecting mirror, and the accuracy of fire detection can be improved.

According to the fire detection device described in Supplementary Note 3, since the notification means for notifying the position of the fire identified by the fire position identification means is provided, the position of the fire can be notified to the external device, The user's convenience in detecting fire can be improved.

According to the fire detection apparatus described in Supplementary Note 4, the imaging control means is provided for setting the imaging interval of the imaging means based on the judgment result of the judging means, and causing the imaging means to take the picked-up images at the set imaging interval. , it is possible to capture a captured image according to the situation of the monitored area. Therefore, for example, when it is determined that a fire has been detected by the determining means, the imaging interval after the fire is detected is set shorter than the imaging interval before the fire is detected, and the set imaging interval , and the presence or absence of a fire can be determined more accurately.

Reference Signs List 1 fire detection device 2 wall 3 surveillance area 4 wiring 11 housing 11a opening 12 reflector 12a imaging portion 12b non-imaging portion 13 first imaging portion 14 second imaging portion 20 control unit 21 operation portion 22 communication portion 23 power supply portion 24 control unit 24a determination unit 24b threshold identification unit 24c fire position identification unit 24d notification unit 25 storage unit 25a threshold table 30 fixing member 31 first fixing unit 32 second fixing unit 33 connecting unit ER1 first extended imaging visual field range R1 first Imaging field of view range of imaging unit

Claims (3)

A fire detection device for detecting fire in a monitored area, comprising:
a reflecting mirror installed movably or immovably at a position capable of projecting the monitoring area, the reflecting surface of the reflecting mirror having a predetermined curvature;
imaging means fixed near the reflecting mirror for capturing an image of the monitoring area reflected on the reflecting surface of the reflecting mirror;
determining means for determining the presence or absence of the fire based on a plurality of captured images captured by the imaging means;
The imaging means is configured to be able to capture the plurality of captured images having different light wavelengths,
The determination means is
Among the plurality of captured images captured by the imaging means, specifying a first incident portion that is a part of the captured image and is a portion where the incident amount with respect to the light wavelength is equal to or greater than a first threshold;
Among the plurality of captured images captured by the imaging means, a second incident portion, which is a part of the captured image and is a portion where the incident amount with respect to the light wavelength is equal to or greater than a second threshold, is specified. ,
It is determined whether or not the first incident portion overlaps with the second incident portion, and if not, it is determined that the fire has been detected, and if they overlap, it is determined that the fire has not been detected. judge,
Fire detection device. the light wavelength of the part of the captured image is an infrared wavelength,
The light wavelength of the other part of the captured image is the wavelength of visible light,
A fire detection device according to claim 1. fire position specifying means for specifying the position of the fire based on the plurality of captured images captured by the imaging means;
The fire location identifying means includes:
identifying a first incidence portion that does not overlap with the second incidence portion among the first incidence portions;
extracting the coordinates of the identified first incident portion;
Identifying the extracted coordinates as the position of the fire to be identified;
The fire detection device according to claim 1 or 2.

Images