JP2018173888A - Fire monitoring support system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire monitoring support system capable of detecting a small fire such as a spark. SOLUTION: The image leaks to the outside of the fire generation area 50 based on a photographing device 12 arranged around the fire generating area 50 and photographing the periphery of the fire generating area 50 and an image photographed by the photographing device 12. By detecting sparks, determining the presence or absence of spark leakage, and receiving the alarm signal output from the spark detection device and the spark detection device that outputs the first alarm signal when it is determined that there is spark leakage. It also has an alarm device that gives an alarm that a spark is generated outside the fire generation region 50. The spark detection device detects the spark based on the shape of the moving object in the image, and the spark detection device determines the spark based on the change in the area and the brightness of the moving object. [Selection diagram] Fig. 2

Description

  The present invention relates to a fire monitoring support system for avoiding a danger caused by a spark generated during a cutting, cutting, polishing or the like leaking from a curing range.

  As a monitoring system for detecting the position and state when a fire occurs, those disclosed in Patent Document 1 and Patent Document 2 are known. The fire monitoring system disclosed in Patent Document 1 arranges sensors at a plurality of locations in a building and recognizes the installation positions of the sensors, so that the location of a fire occurrence can be determined from the position of the sensor that has detected an abnormality. It is a technology that aims to identify.

  In addition, the fire monitoring system disclosed in Patent Document 2 acquires an on-site image by a camera when a fire alarm is activated, and determines a position where a fire will occur by a luminance signal in the image. It is detected and a fire is judged based on the contour of the portion where the luminance is high.

JP 2006-268495 A JP-A-5-20561

  Both Patent Document 1 and Patent Document 2 seem to be effective for monitoring and recognizing the occurrence of a fire, its location, the scale of the fire, and the like. However, any technique disclosed in any document cannot cope with the leakage of a spark or the like in which the amount of energy is small and the luminance changes between occurrence and fall.

  Therefore, an object of the present invention is to provide a fire monitoring support system that can cope with detection of small fires such as sparks.

  In order to achieve the above object, a fire monitoring support system according to the present invention is arranged around a fire generating region, and is based on an image capturing device that captures the periphery of the fire generating region and an image captured by the image capturing device. Detecting a spark leaking outside the spark generation region, determining whether or not there is a spark leak, and when determining that there is a spark leak, a spark detection device that outputs a first alarm signal; and An alarm device that gives an alarm to the effect that a spark is generated outside the spark generation region by receiving the alarm signal output from the spark detection device, and detection of sparks by the spark detection device, It is performed based on the shape of the moving object in the video, and the spark detection by the spark detection device is performed based on changes in the area and luminance of the moving object.

  Further, in the fire monitoring support system having the above-described features, the spark detection device outputs the first alarm signal, and then determines whether or not a fire has occurred based on a temperature change at a falling position of the leaked spark. When it is determined that a fire has occurred, a second alarm signal is output. When the alarm device receives the second alarm signal, a fire has occurred outside the fire generation area. It can also be set as the structure which alerts that it exists.

  By having such a feature, when a spark leaks outside the spark generation region, it is possible to determine whether or not a fire has occurred due to the leaked spark.

  Further, in the fire monitoring support system having the above-described features, the alarm device allows an operator working inside the fire generation area to generate fire outside the fire generation area simultaneously with the alarm. A notification means for informing may be included.

  By having such a feature, it is possible to make an operator working in the fire generation area recognize that a spark has leaked. In addition, by alerting the operator by notification, it is possible to suppress the occurrence of fire due to the occurrence of fire outside the fire generation area.

  Further, in the fire monitoring support system having the above-described features, a work power supply is provided inside the fire generation area, and the power supply receives an output of the work tool by receiving the first alarm signal. It is also possible to have a function to cut off power.

  By having such a feature, it is possible to suppress the occurrence of a secondary disaster such as a fire due to the continuing leakage of sparks.

  Furthermore, the fire monitoring support system having the above-described characteristics may include a central monitoring device, and a plurality of the spark detection devices may be attached to a single central monitoring device.

  By having such a feature, when the spark generation regions are arranged in a plurality of locations, it is possible to collectively manage information acquired by the spark detection device provided for them.

  According to the fire monitoring support system having the above-described features, it is possible to cope with detection of small fires such as sparks, and it is possible to improve fire safety management at a work site or the like.

It is a block diagram which shows the structure of the fire monitoring assistance system which concerns on embodiment. It is a perspective view which shows the relationship between an imaging device and a flame generation | occurrence | production area | region. It is a processing flow figure at the time of performing spark detection and fire detection by a fire monitoring support system. It is a figure for demonstrating the sensitivity adjustment at the time of defining a difference area. It is a flowchart for performing determination about whether a moving object is a spark. It is a flowchart for determining whether a fire has occurred after a spark is detected. It is a figure which shows the structural example of the fire monitoring support system which attached the some spark detection apparatus with respect to the single centralized monitoring apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment according to a fire monitoring support system of the present invention will be described in detail with reference to the drawings. First, the configuration of the fire monitoring system according to the present embodiment will be described with reference to FIG.

[System configuration]
The fire monitoring support system 10 according to the present embodiment is configured based on an imaging device 12, a spark detection device 14, and an alarm device 16, and is accompanied by a power source 18 for work tools. The imaging device 12 is a means for photographing the state of the fire generation area 50, which is arranged around the fire generation area 50 as shown in FIG. The spark generation area 50 is an area where the worker 60 performs an operation of generating a spark such as a spark such as cutting, cutting, polishing, and welding of a metal member or the like using the electric tool 52 or the like. More specifically, it is the inside of an isolation area (curing house) covered with fireproof cloth or the like, and the imaging device 12 is arranged so as to be able to image the surroundings of the fire generating area 50. .

  In addition to a camera for acquiring video, the imaging device 12 is accompanied by a sensor (for example, a line laser) for detecting the position and movement of an object within the imaging range as numerical data (not shown). ). In addition, it is desirable to arrange the imaging devices 12 at a plurality of locations so that not only one location but also the entire area around the fire generation region 50 can be monitored.

  The spark detection device 14 detects the spark A leaking outside the spark generation region 50 based on the video imaged by the photographing device 12 and the detection value of the sensor, and the spark A leaks from the spark generation region 50. It is an apparatus for determining the presence or absence of a fire or the presence or absence of a fire in the vicinity of the fire generation region 50.

  The spark detection device 14 includes at least a reading unit 14a, an image processing unit 14b, a control unit 14c, a display unit 14d, an image storage unit 14e, and an output unit 14f. The reading unit 14a is an interface for acquiring video and numerical data captured by the imaging device 12 and sending the acquired video and numerical data to the image processing unit 14b.

  The image processing unit 14b is an element that performs processing for detecting an edge (contour shape) of a moving object from video or numerical data input through the reading unit 14a.

  Based on the edge data of the moving object detected by the image processing unit 14b and various predetermined threshold values, the control unit 14c determines whether the moving object is a spark or whether a fire has occurred. This is the element that performs the determination. The controller 14c outputs a signal indicating that a first alarm signal is output when the occurrence of a spark is recognized based on the threshold value, and outputs a second alarm signal when it is determined that a fire has occurred. The signal is output.

  The display unit 14d only needs to be a monitor or the like, and the video and numerical data acquired by the photographing device 12, various processing target videos such as the image detected by the edge of the image processing unit 14b, and the images are made visible. Play a role to display.

  The image storage unit 14e is an element for storing video and numerical data acquired by the imaging device 12, various types of processing target video such as an image detected by the image processing unit 14b, and images. The image storage unit 14e stores an image in which a fire or a fire has been confirmed, and outputs the image to the output unit 14f.

  The output unit 14f is a signal based on an image acquired by the imaging device 12 or a signal output from the control unit 14c (a signal indicating that the first alarm signal is output or a signal indicating that the second alarm signal is output). The image output from the image storage unit 14e due to the occurrence of fire or the occurrence of fire is output to the alarm device 16 and the power source 18.

  The alarm device 16 receives an alarm signal (a first alarm signal or a second alarm signal) output from the spark detection device 14 and thereby issues an alarm that a fire has occurred outside the fire generation region 50. Is an element. In addition, the alarm device 16 includes a notification unit 20 for notifying a worker working inside the fire generation region 50 that a fire is generated outside the fire generation region 50.

  The alarm device 16 includes an input unit 16a, a processing unit 16b, and an output unit 16c. The input unit 16a is an interface through which an alarm signal such as a first alarm signal or a second alarm signal is input. When an alarm signal is input to the input unit 16a, the signal is transmitted to the processing unit 16b. The processing unit 16b determines whether the input signal is the first alarm signal or the second alarm signal, and outputs a processing signal corresponding to each signal to the output unit 16c. Specifically, when the first alarm signal is input, the output unit 16c outputs a signal to output an alarm notifying that the spark A has leaked and the occurrence of fire. On the other hand, when the second alarm signal is input, the output unit 16c outputs a signal to output an alarm notifying that a fire has occurred.

  The reporting unit 20 includes a reading unit 20a and a display unit 20b. The reading unit 20a is an interface to which information from the outside is input, like the spark detection device 14. The display unit 20b is a means capable of recognizing an alarm visually using a monitor, an alarm light, or the like. When the worker 60 wears goggles or the like, an alarm may be displayed through the goggles.

  When the first alarm signal is input to the reading unit 20a, the display unit 20b outputs a display indicating that the spark A is leaking outside the fire generation region 50 or that a fire is generated. And the image output from the image storage unit 14e are output. In the display unit 20b, the operator 60 is notified of the abnormality by displaying a leak of spark A or the occurrence of fire on the monitor, displaying an image indicating the state, flashing a warning light, or lighting. Output for

  The power source 18 is a power source for the electric tool 52 used in the fire generating area 50. For example, the power supply 18 may have an input unit 18a, a processing unit 18b, and an output unit 18c. The input unit 18a is an interface to which a first alarm signal from the spark detection device 14 is input, and the processing unit 18b is an element that outputs a signal for performing function control based on the first alarm signal. Furthermore, the output unit 18c is an element that receives a signal from the processing unit 18b and blocks the output of the power supply 18. For this reason, when the first alarm signal is input to the input unit 18a, a signal is output to the processing unit 18b, and a function control signal is input to the output unit 18c via the processing unit 18b. The output unit 18c to which the function control signal is input performs control to cut off the output of the power source for the electric tool 52.

[Processing flow]
Next, control will be described with reference to the flow shown in FIG. 3 by the fire monitoring support system according to the present embodiment.

  First, various threshold values and parameters are set as a basis for making a determination by the fire monitoring support system 10. The threshold value defined in the present embodiment is, for example, a moving object threshold value, a luminance threshold value, a hue threshold value, or the like. The parameters are sensitivity, detection interval, correlation interval, and the like.

  Here, of the threshold values, the moving object threshold value is a threshold value that determines a standard for the size of a moving object (moving object) recognized as a spark. By increasing this value, a large moving object is determined as a spark. . As the moving object threshold value, for example, the reference value may be 500 pixels, and the swing width may be determined depending on the situation.

  The luminance threshold value is a threshold value that determines brightness for recognition as a spark, and is determined to be a spark when the luminance of the original data in the area constituting the difference area is higher than this value. For example, the reference value of the brightness threshold is 60 LUX, and the swing width may be determined according to the situation.

  The hue threshold value is a threshold value for performing determination based on the hue of the original data of the area certified as the difference area. Hue is performed in units of pixels, and the comparison with the threshold value is made with the average value of the hue values detected in units of pixels constituting the difference area. As a hue threshold, when a spectrum in which visible light colors are arranged for each wavelength is used as a reference, and the long wavelength side is classified as 0 and the short wavelength side as 359, the minimum threshold value is 5 and the maximum threshold value is 70. It is advisable to determine the width according to the situation.

  Here, the difference area refers to an area of a white portion obtained by converting an image in a range including moving objects into a gray scale and then binarizing.

  Of the parameters, the sensitivity is a value determined for the purpose of not being affected by noise. When this value is increased, the detection sensitivity is increased, and a large range is detected as a difference area. On the other hand, when this value is reduced, the detected difference area is reduced. Specifically, FIG. 4 shows an image in a range that is recognized as including a difference area converted to grayscale, and the density of the converted image is binarized according to the sensitivity setting value. When such image processing is performed, an area regarded as white by binarization is determined as a difference area. As a reference value of sensitivity, for example, as shown in FIG. 4, in the case of a gray scale converted by gradation in 256 steps from 0 (white) to 255 (black), the range regarded as white is 50 or less (sensitivity 50). It is preferable to determine the width based on the image quality according to the brightness of the surroundings.

  The detection interval is a time for performing determination as a spark. Sparks usually change in brightness in a very short time. For this reason, when a change such as a value exceeding various threshold values (for example, a moving object threshold value) and a value within the threshold range occurs during a predetermined detection interval, it is determined that the detected difference area is a spark. To do. The detection interval may be about 50 nsec, for example.

  The correlation interval is an element for confirming the situation before and after the time zone in which the difference area to be determined as a spark is generated, and is a fixed time range before and after the difference area occurrence time zone. The correlation interval may be about 300 nsec, for example (step 10).

  Next, based on the video imaged by the imaging device 12 and a predetermined threshold value, detection and determination as to whether or not a spark A has occurred outside the fire generation region 50 are performed. Here, the detection and determination of the spark A may be performed according to the procedure shown in FIG. 5, as will be described in detail later (step 20).

  If it is determined in step 30 that there is no leakage of spark A, the detection cycle ends. On the other hand, when it is determined that the spark A has leaked, the alarm by the alarm device 16 and the notification by the notification means 20 are made, and then the power supply by the power source 18 is shut off ( Step 40, Step 50).

  After the power supply 18 is shut off, detection is made as to whether or not a fire has occurred due to the occurrence of the leakage of the spark A (step 60). Here, the detection and determination of the fire may be performed according to a procedure as shown in FIG. 6, as will be described in detail later.

  If it is determined in step 70 that there is no fire, the detection cycle ends. On the other hand, if it is determined that a fire has occurred, fire information such as an alarm by the alarm device 16 or the reporting means 20 and provision of fire information are provided, and the detection cycle ends (step 80).

[Spark detection]
In the detection cycle as described above, the detection and determination of the spark may be performed according to the flow shown in FIG. First, the area (edge area) of the difference area certified according to the luminance threshold and sensitivity is calculated (step 20A). Next, the obtained edge area (unit: pixel) is compared with the moving object threshold value, and the magnitude is obtained (step 20B). Here, if the edge area is outside the moving object threshold range, that is, a value larger than the moving object threshold value, it is determined that the edge area does not correspond to a spark, and the spark determination flow ends (step 20J).

  On the other hand, when the edge area is within the moving object threshold value range, the luminance of the difference area is calculated. The luminance of the difference area is calculated at predetermined detection intervals, and the luminance difference is obtained (step 20C). A luminance difference for each detection interval calculated in step 20C is obtained, and it is determined whether or not this luminance difference exceeds a predetermined range (step 20D). Here, when the luminance difference is smaller than the predetermined range, it is determined that the difference is not a spark, and the spark determination flow ends (step 20J).

  On the other hand, if the luminance difference exceeds a predetermined range, the hue of the difference area is calculated (step 20E). Next, it is determined whether or not the average value of the hue values for each pixel constituting the difference area is within the range of the hue threshold value (step 20F). Here, when the average value of the hue values in the difference area is outside the range of the hue threshold value, it is determined that the difference does not correspond to a spark, and the spark determination flow ends (step 20J).

  On the other hand, when the average value of the hue values in the difference area is within the range of the hue values, a change in the edge area within the correlation interval is calculated (correlation check: step 20G). Next, it is determined whether or not the value obtained by the correlation check is larger than a predetermined value. Specifically, it is determined whether or not the change amount (correlation value) of the edge area exceeds a predetermined range (for example, a range of 70% or more when the edge area becomes maximum) within the detection interval. (Step 20H). Here, if it is determined by the correlation check that the amount of change in the edge area is smaller than the predetermined range, the spark determination flow ends (step 20J), assuming that it does not correspond to a spark.

  On the other hand, when it is determined that the amount of change in the edge area is larger than the predetermined range, it is determined that it corresponds to a spark (step 20I).

[Fire detection]
In the detection cycle as described above, the detection and determination of fire may be performed according to the flow shown in FIG. Note that the threshold for fire detection is determined separately from spark detection. As a threshold for fire detection, a threshold for temperature change, a threshold for shape matching, and the like can be used. Here, the threshold value for temperature change is a threshold value for an increase in temperature due to the occurrence of a fire. The shape matching threshold is a threshold for determining whether or not a difference area detected by brightness and sensitivity is similar to a shape (area area) defined as a flame, for example.

  In the fire detection flow after setting such a threshold value, first, the fall position of the moving object determined as a spark is confirmed (spark fall position determination: step 60A). Next, a temperature change at the spark falling position is detected (step 60B). After detecting the temperature change at the spark drop position, it is compared with a predetermined temperature change threshold (step 60C). As a result of the comparison, when it is determined that the detected temperature change is smaller than the threshold value, it is determined that no fire has occurred (no fire has occurred), and the fire detection flow ends (step 60G).

  On the other hand, when it is determined that the temperature change at the fire drop position is larger than the threshold value, the contour detection of the difference area for shape matching of the difference area is performed (step 60D). After the contour of the difference area is detected, a difference (similarity) between the contour of the obtained difference area and the contour determined based on the reference data is obtained as shape matching (step 60E). As a result of the shape matching, when the similarity is lower than a predetermined value, it is determined as dissimilar. If the results of the shape matching are dissimilar, it is determined that there is a possibility of fire, although the possibility of fire is low, the fire detection flow ends (step 60H).

  On the other hand, as a result of the shape matching, when the similarity of the contour shape between the difference area and the reference data is greater than or equal to a predetermined value, it is determined that they are similar. If the results of the shape matching are similar, it is determined that a fire has occurred, and the fire detection flow ends (step 60F). The reference data here refers to the possibility of igniting each of a plurality of images taken from the time of spark leakage to the ignition, or the judgment result of the occurrence of a fire is accumulated and determined from that It is a contour shape with high possibility of ignition or a contour shape with high possibility of fire occurrence.

[Action / Effect]
According to the fire monitoring support system 10 having such a configuration, it is possible to cope with detection of a small fire such as a spark. Specifically, when the spark A leaks outside the spark generation area 50, it is determined that it is a spark, an alarm is output, and the output power from the power source 18 in the spark generation area 50 is cut off. To do. Further, after it is determined that the spark A has leaked to the outside of the spark generation area 50, if there is a possibility of fire or ignition at the spark falling position, an alarm is given and a notification is given. It will be.

  As a result, it is possible to prevent a situation in which the spark A continuously leaks outside the fire generation region 50. In addition, when a spark or fire occurs due to the leakage of the spark A, it is possible to prevent the expansion of the damage and the secondary disaster by issuing a warning and notifying promptly.

[Others]
The fire monitoring support system 10 having such a configuration can also attach the spark detection device 14 to the centralized monitoring device 30. The centralized monitoring device 30 may include, for example, a reading unit 32, a processing unit 34, and a display unit 36. The reading unit 32 is an element for receiving a video, an image, and a signal output from the output unit 14f provided in the spark detection device 14 and sending them to the processing unit 34, similarly to the reporting unit 20 and the like. is there. The processing unit 34 is an element having a function of processing information input to the reading unit 32 and data such as alarms, notifications, and images in units of the output fire monitoring support system 10 and outputting them to the display unit 36. It ’s fine. The display unit 36 may be a monitor or the like, and is an element that displays information input from the processing unit 34 so as to be visible to a monitor.

  With this configuration, when the fire generation regions 50 are arranged in a plurality of locations, the central monitoring device 30 collectively manages the information acquired by each spark detection device 14 provided therein. It becomes possible to do.

DESCRIPTION OF SYMBOLS 10 ......... Fire monitoring support system, 12 ......... Photographing device, 14 ......... Spark detection device, 14a ......... Reading unit, 14b ......... Image processing unit, 14c ......... Control unit, 14d ......... Display section, 14e ......... Image storage section, 14f ......... Output section, 16 ......... Alarm device, 16a ......... Input section, 16b ......... Processing section, 16c ......... Output section, 18 ......... Power supply, 18a ......... Input unit, 18b ......... Processing unit, 18c ......... Output unit, 20 ......... Notification means, 20a ......... Reading unit, 20b ......... Display unit, 30 ......... Centralized monitoring Device 32... Reading section 34... Processing section 36... Display section 50... Fire generation area 52 52 Electric tool 60.

Claims (5)

An imaging device that is arranged around the fire generation area and shoots around the fire generation area;
Based on the video imaged by the imaging device, a spark leaking outside the spark generation area is detected, the presence / absence of a leak of the spark is determined, and when it is determined that there is a spark leak, A spark detection device for outputting an alarm signal;
An alarm device that gives an alarm to the effect that a fire has occurred outside the spark generation region by receiving the alarm signal output from the spark detection device;
Spark detection by the spark detection device is performed based on the shape of the moving object in the video,
A spark monitoring support system characterized in that determination of a spark by the spark detection device is performed based on changes in area and brightness of the moving object. The spark detection device, after outputting the first alarm signal, determines whether or not a fire has occurred based on a temperature change at a falling position of the leaked spark, and when determining that a fire has occurred, 2 Output alarm signal,
2. The fire monitoring support system according to claim 1, wherein when the second warning signal is received, the warning device issues a warning that a fire has occurred outside the fire generation area. 3. .   The alarm device includes notification means for simultaneously notifying the alarm and notifying a worker who performs work inside the fire generation area of the occurrence of fire outside the fire generation area. 2. The fire monitoring support system according to 2. Having a power source for working inside the fire generating area;
The fire monitoring support system according to any one of claims 1 to 3, wherein the power source has a function of cutting off output power for a work tool by receiving the first alarm signal. . With centralized monitoring equipment,
The fire monitoring support system according to any one of claims 1 to 4, wherein a plurality of the spark detection devices are attached to the single centralized monitoring device.

Images