JP2000137877A - Fire detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the influence of reflection and composition by a body at the periphery of a different vehicle, etc., and to accurately specify fire occurrence and its position by deciding that a fire takes place when more than a specific number of fluctuations are present in a fluctuation detection area at the periphery of a luminescent point area. SOLUTION: A fluctuation detection area generating circuit 11 sets the fluctuation detection area of specific pixel width at the periphery of each luminescent point area. Then a fluctuation pixel extracting circuit 12 extracts fluctuation pixels in the fluctuation detection area. A fire deciding circuit 13a decides a fire in each luminescent point area from the area (number) of the luminescent point area, the number of fluctuation pixels in the fluctuation detection area, or the ratio of the number of fluctuation pixels to the fluctuation detection area and then decides a fire when more than a specific number of luminescent point areas judged as a figure are present. Here, a fluctuation pixel content rate calculating circuit 12a is provided and fire occurrence is decided while limited to luminescent point areas larger than specific area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector for detecting a fire that has occurred in a road tunnel or the like.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a block diagram illustrating a configuration of a conventional fire detection device disclosed in Japanese Patent Application Laid-Open Publication No. HEI 10-115,000. In the figure, reference numeral 1 denotes an image pickup device, for example, a TV.
A camera 2, a TV camera control circuit for controlling the TV camera 1, a frame memory 3 for taking in a digitized image signal, and a density histogram 4 for creating a density histogram of an original image stored in the frame memory 3. The creation circuit 5 is a fire determination circuit that determines the occurrence of a fire based on the density histogram.

Next, the operation will be described. TV camera 1
Captures an image of the monitoring area at an arbitrary frame interval according to the TV camera control circuit 2. The frame memory 3 has T
An image obtained by converting an image signal of the V camera 1 into a digital signal is captured. The density histogram creation circuit 4 creates a density histogram by counting the number of pixels for each density in the image stored in the frame memory. The fire determination circuit 5 determines whether or not a fire has occurred based on the value of the density histogram. That is, in the density histogram, when the number of density value peaks in a predetermined range is equal to or more than a predetermined value, it is determined that a smoke fullness state or a fire has occurred.

[0004]

Since the conventional fire detection device is configured as described above, for example, in a case where an object is in a road tunnel, a variety of vehicles pass therethrough. There is a problem that information from light and reflection from a car is synthesized, and the occurrence of a fire cannot be correctly identified from the pattern of the density histogram, thereby causing a false report.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fire detecting device capable of correctly identifying the occurrence of a fire even when a moving object transiently enters a monitoring area. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a fire detecting apparatus comprising: an image capturing section for capturing an image of a monitoring area; and a frame memory for storing image data of an original image captured by the image capturing section. In a fire detection device that detects the occurrence of a fire from image data, a luminescent spot extracting unit that extracts, as a luminescent point, a pixel having a predetermined level or more of luminance continuously from a plurality of pieces of image data for a predetermined time or more, A fluctuation detection area setting means for providing a fluctuation detection area having a predetermined width adjacent thereto, and a fluctuation pixel in which the number of times the luminance of a pixel in the fluctuation detection area fluctuates above and below a reference luminance value within a predetermined time is equal to or more than a predetermined value. And a flame / fire determining means for determining that a fire has occurred when the total number of the fluctuation pixels in the fluctuation detection area is equal to or greater than a predetermined number.

According to a second aspect of the present invention, there is provided a fire detecting area for creating a bright spot area by connecting pixels adjacent to each other as four or eight neighboring pixels to a bright spot pixel. There is provided a creating means and a fluctuation detecting area creating means for creating a fluctuation detecting area of a predetermined width adjacent to the outside of each bright spot area.

According to a third aspect of the present invention, there is provided a fire detecting apparatus comprising: a background image storing means for storing an original image having no flame as a background image; and a difference between the original image and the background image stored in the frame memory. There is provided a means for forming an image and a luminescent spot extracting means for extracting pixels having a brightness not less than a predetermined threshold value as luminescent points continuously for a predetermined time or more in the difference image.

According to a fourth aspect of the present invention, there is provided a fire detection apparatus, wherein a fluctuation pixel content ratio for obtaining a fluctuation pixel content ratio of the number of fluctuation pixels existing in the fluctuation detection area for each bright spot area with respect to the area of the fluctuation detection area. A calculation circuit is provided.

According to a fifth aspect of the present invention, there is provided a fire detection device for detecting a stop of a vehicle and detecting a stop position of the vehicle, and a fire detection for setting a fire detection range at the vehicle stop position. And a range setting means.

According to a sixth aspect of the present invention, there is provided a fire detecting apparatus, comprising: a background image recording means for holding an image free from smoke as a background image; Background updating means for updating by multiplying the coefficients, edge extracting means for calculating the edge strength for each pixel of the image to be processed and the background image, line setting means for setting a plurality of lines on the screen, An edge intensity change rate extraction means for obtaining an edge intensity change rate which is a ratio of a sum of edge intensity values of respective pixels of the original image to a sum of edge intensity values of respective pixels of the background image; When the number of lines equal to or less than the predetermined value is equal to or greater than a predetermined value, smoke detection means for generating smoke and smoke fire determination means for determining that a fire has occurred when smoke generation continues for a predetermined time or more are provided. It is.

According to a seventh aspect of the present invention, there is provided a fire detecting apparatus, comprising: a background image storing means for storing an image in which no smoke exists as a background image; and a pixel for each pixel of the original image and the background image stored in the frame memory. Edge extraction means for obtaining edge strength; line setting means for setting a plurality of observation lines on the screen to be measured; for each observation line, each pixel of the original image with respect to the sum of the edge intensity values of each pixel of the background image Edge intensity change rate extraction means for obtaining an edge intensity change rate that is a ratio of the sum of the edge intensity values, and when the number of lines whose edge intensity change rate is equal to or less than a predetermined value is equal to or greater than a predetermined value,
Smoke detection means for generating smoke, and smoke fire determination means for determining that a fire has occurred when the smoke generation has continued for a predetermined time or more,
When the total number of the fluctuation pixels in the fluctuation detection area is equal to or more than a predetermined number, or the area of the bright spot area and the ratio of the fluctuation pixels present in the fluctuation detection area to the fluctuation detection area with respect to the fluctuation detection area are equal to or more than a predetermined value. And a flame / fire determining means for determining that a fire has occurred.

[0013] In the fire detection device according to the present invention, the number of lines whose edge intensity change rate is equal to or less than a predetermined value is equal to or more than a predetermined value, and the edge intensity change rate in a predetermined time is equal to or less than a predetermined value. When the rate of increase of the number of lines is within a predetermined range, smoke detection means is provided for generating smoke.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram illustrating a configuration of the fire detection device according to the first embodiment. In the figure, reference numeral 1 denotes a TV which is an imaging unit for imaging a monitoring area.
The camera 2 has a control circuit of the TV camera 1, and the frame memory 3 stores image data of an original image captured by the TV camera 1.

Reference numeral 6 denotes a background image storage circuit for recording an image when there is no fire or a moving object as the background image. Reference numeral 7 denotes a background update circuit for updating a background image in accordance with a temporal change in illuminance. Reference numeral 8 denotes a background difference circuit, which is a frame memory 3
And a difference image between the original image and the background image of the flame detection target stored in the storage unit.

Reference numeral 9 denotes a bright point extracting circuit for extracting a pixel as a bright point when the luminance of the pixel to be measured continues for a predetermined time or more over a preset threshold value. Reference numeral 10 denotes a bright spot area creation circuit which limits an area to be measured around a bright spot to a predetermined size. Reference numeral 11 denotes a fluctuation detection area creation circuit which limits an area for detecting fluctuation around a bright point. Reference numeral 12 denotes a fluctuation pixel extraction circuit, which is used when the number of times that the luminance of each pixel of the difference image in the fluctuation detection area changes up and down with respect to a predetermined reference level within a predetermined time is equal to or more than a predetermined value. This is extracted as a fluctuation pixel.

Numeral 12a denotes a fluctuation pixel content calculating circuit for calculating a fluctuation pixel content ratio which is a ratio of the number of fluctuation pixels existing in the fluctuation detection region to the area of the fluctuation detection region for each bright spot region. is there. Reference numeral 13a denotes a flame / fire determining circuit which determines that a fire has occurred when the fluctuation pixel content rate or the total number of fluctuation pixels in the fluctuation detection area is equal to or greater than a predetermined number.

FIG. 2 is a diagram showing the structure of a flame when a fire occurs. Reference numeral 2a denotes the center of the flame, which is a cluster of pixels having high luminance on the image (hereinafter referred to as bright spots). 2
b is a fluctuation formed around the center of the flame, and is a portion where a high luminance state and a low luminance state alternately occur. 2
c is a fluctuation detection area which limits an area in which fluctuation is detected. The flame is composed of a flame center 2a in which a bright point state is stably obtained and its periphery, that is, a fluctuation part 2b. In the present embodiment, the occurrence of a fire is determined by detecting this state.

Next, the operation of the fire detecting device according to the first embodiment will be described. The TV camera 1 captures an image of the monitoring area at an arbitrary frame interval according to the TV camera control circuit 2. The frame memory 3 stores image data of a fire determination target image (hereinafter, referred to as an original image) captured by the TV camera 1.

The bright spot extraction circuit 9 causes the frame memory 3
, A plurality of image data for a predetermined time are stored, and a pixel having a luminance equal to or higher than a preset threshold value for a predetermined time is extracted as a bright point. Next, the bright spot area creating circuit 10 forms a bright spot area in which a plurality of successively adjacent bright spots are connected. For example, a bright spot area is created by connecting four or eight neighboring pixels that are bright spots.
By limiting the area to the bright spot area adjacently connected in this way, it is possible to accurately specify a fire occurrence and its position.

Next, the fluctuation detection area creating circuit 11 sets a fluctuation detection area having a predetermined pixel width around each bright spot area. Next, the fluctuation pixel extraction circuit 12 extracts fluctuation pixels in the fluctuation detection area 2c. The flame / fire determination circuit 13a determines, for each bright spot area, a flame based on the area (number) of the bright spot area and the number of fluctuation pixels in the fluctuation detection area or the ratio of the number of fluctuation pixels to the fluctuation detection area. It is determined whether or not there is a fire. If there is a certain number or more of bright spot areas determined to be a flame, it is determined that a fire has occurred.

Here, a fluctuation pixel content ratio calculating circuit 12a for obtaining a fluctuation pixel content ratio of the number of fluctuation pixels existing in the fluctuation detection region for each bright spot region with respect to the area of the fluctuation detection region is provided. If the occurrence of a flame is determined only in the bright spot area, the occurrence of a fire can be accurately specified.

As described above, it is determined that a fire has occurred when a predetermined number or more of fluctuations are present in the fluctuation detection area around the bright spot area, so that the influence of reflection or combination by surrounding objects such as other vehicles is removed. Thus, the occurrence of a fire and its position can be accurately specified.

Embodiment 2 FIG. FIG. 3 is a block diagram illustrating a configuration of the fire detection device according to the second embodiment. In the figure, reference numeral 6 denotes a background image storage circuit which stores an image when there is no fire or a moving object. 7 is
A background update circuit that updates a background image in response to a temporal change in illuminance. For example, Seki, Kuroda, “Highly Reliable Intrusion Monitor Using Motion Information”, Mitsubishi Electric Technical Report, Vo
The background image is updated by the method described in l.67, No. 7 (1993). Reference numeral 8 denotes a background difference circuit for calculating a difference image between the original image of the flame detection target and the background image. The other reference numerals are the same as those of the first embodiment, and the description is omitted.

Next, the operation of the fire detecting device according to the second embodiment will be described. The background image storage circuit 6 stores an original image when there is no fire or a moving object as a background image. Next, the background difference circuit 8 obtains a difference image between the original image and the background image. Next, the bright spot extraction circuit 10
A bright point is extracted from the difference image. Hereinafter, the steps up to the fire determination are the same as those in the first or second embodiment, and thus description thereof will be omitted.

In the second embodiment, the difference image between the original image and the background image is used. However, the original image itself may be used as the fire detection target image without using the background image.
Further, the detection of the fire is not limited to the flame itself. For example, when the detection is performed in a road tunnel, a reflection image of the flame reflected on a wall surface, a ceiling, or a road surface of the tunnel may be detected.

As described above, in the fire detecting apparatus according to the second embodiment, since a fire is determined based on the difference image between the original image and the background image, an area having a high luminance other than the flame area is removed from the processing target. It is possible to prevent the erroneous detection and accurately specify the occurrence of the fire and its position.

Embodiment 3 FIG. 4 is a block diagram illustrating a configuration of the fire detection device according to the third embodiment. In FIG. 4, reference numeral 30 denotes a vehicle extraction circuit which processes an image of the TV camera 1 installed on the road and extracts the shape of the vehicle traveling on the road. Reference numeral 31 denotes a stopped vehicle detection circuit which detects a stop of the vehicle based on the vehicle information of the vehicle extraction circuit 30 and obtains a stop position of the vehicle. 32 is a fire detection area creation circuit,
A fire detection area of a predetermined size is created around the position of the stopped vehicle.

FIG. 5 is a diagram showing the relationship between the stopped vehicle and the fire detection area. 5a is a stopped vehicle, and 5b is a fire detection area. The other reference numerals are the same as those of the first or second embodiment, and the description is omitted.

Next, the operation of the fire detecting device according to the third embodiment will be described. First, the shape of the traveling vehicle is extracted by the vehicle extraction circuit 30 based on the image data of the original image captured by the TV camera 1 installed on the road. As a vehicle extraction method, for example, a method disclosed in Japanese Patent Application Laid-Open No. 5-64494 is used. Next, the stopped vehicle detection circuit 31
Accordingly, the stop of the vehicle is detected based on the vehicle information of the vehicle detection circuit 30, and the stop position of the vehicle is obtained.

The fire detection area creation circuit 32 shown in FIG.
A fire detection area 5b having a predetermined width is created. Next, the bright spot extraction circuit 9 extracts a bright spot in the fire detection area 5b. Hereinafter, the steps up to the determination of the fire occurrence are described in Embodiment 1.
Or, since it is the same as that of the second embodiment, the description is omitted.

In the third embodiment, the vehicle extraction circuit 3
Although the 0 and stopped vehicle detection circuit 31 is provided, it may be executed by an external device. In this case, the position information of the stopped vehicle is received through communication means such as a network, and the setting of the fire detection area is performed based on the information. I do.

As described above, since a stopped vehicle is detected and a fire detection area is provided around the stopped vehicle to limit the fire detection area, it is possible to accurately and quickly specify a fire occurrence and its occurrence position. .

Embodiment 4 FIG. 6 is a block diagram illustrating a configuration of the fire detection device according to the fourth embodiment. In FIG. 6, reference numeral 50 denotes an original image edge creating circuit which emphasizes edges of the original image. Reference numeral 51 denotes a background edge creating circuit that emphasizes the edges of the background image. A processing line setting circuit 52 sets a processing line to be subjected to data processing on the screen of the original image and the background image.

Reference numeral 53 denotes an edge strength sum calculation circuit.
This is to calculate the sum of the edge intensities on the same processing line of the original image and the background image. An edge intensity change rate calculation circuit 54 calculates an edge intensity change rate which is the sum of the edge intensity of the background image and the sum of the edge intensity of the original image on the same processing line. Reference numeral 55 denotes a smoke determination circuit that determines the generation of smoke based on the edge intensity change rate. Reference numeral 13b denotes a smoke fire determination circuit which determines that a fire has occurred when the generation of smoke has continued for a predetermined time or more.

FIG. 7 is a diagram in which a processing line is provided for observation on the road in the monitoring area. 7a is a processing area,
This is the area where fire is detected. Reference numeral 7b denotes a processing line which is a target of image processing. 7c is a lane,
7d is a wall surface of a road or a tunnel.

Next, the operation of the fire detecting device according to the fourth embodiment will be described. First, in the original image edge creation circuit 50 or the background image edge creation circuit 51, the edge strength of the original image and the background image stored in the frame memory 3 is obtained using, for example, a Sobel filter.

A processing line for observation at predetermined intervals is provided on a screen of a road which is a monitoring area. The processing line setting circuit 52 sequentially sets a plurality of processing lines on the original image and the background image. Next, the edge strength sum calculation circuit 53 calculates the edge strength sum of the original image and the background image for each processing line. If smoke is generated at the time of a fire, visible light is scattered by the smoke particles, and the structure becomes difficult to see. Therefore, as the smoke increases, the sum of the edge intensities of the processing lines decreases, whereby the generation of smoke can be detected.

Next, the edge intensity change rate calculating circuit 54 obtains an edge intensity change rate which is a ratio of the background image edge intensity sum to the original image edge intensity sum for each corresponding processing line. Next, the smoke determination circuit 55 counts the number of processing lines whose edge intensity change rate is equal to or less than a predetermined threshold value, and determines that the time increase rate of the number is within the range of a preset threshold value and the total number. Is greater than or equal to a predetermined threshold value. Next, the smoke fire determination circuit 13
According to b, it is determined that a fire has occurred when the smoke has continued for a predetermined time or more.

As described above, the occurrence of smoke is determined based on the edge intensity change rate, and it is determined that a fire has occurred when the smoke has continued for a predetermined time or more. Therefore, the occurrence of a fire is determined even when the flame cannot be directly observed. be able to.

In the embodiment, smoke determination is performed based on the number of processing lines in which the edge intensity change rate decreases. The smoke determination may be performed based on a decrease in the number of pixels having the edge intensity value.

Embodiment 5 FIG. FIG. 8 is a block diagram illustrating a configuration of the fire detection device according to the fifth embodiment. In FIG. 8, reference numeral 70 denotes a comprehensive fire determination circuit, which includes a flame fire determination means for detecting a fire by flame, a smoke fire determination means for detecting a fire by smoke, and a determination means based on a vehicle stop position. Is determined. Other signs are
Since they are the same as those in FIGS. 1 to 7, the same reference numerals are given and the description is omitted.

Next, the operation will be described. Embodiment 5
Is a combination of the flame detection method and the smoke detection method of the first to fourth embodiments. Then, the fire comprehensive judgment circuit 70
Is multiplied by the reliability of the result and the weighting factor of the result of determination on the three determination results, that is, the result of the determination by the flame and fire determination means, the result of the determination by the smoke and fire determination means, and the result of the determination of the vehicle stop position. When the value is equal to or greater than a predetermined threshold, a final fire determination that a fire has occurred is made.

This can be expressed by the following equation: Fc × Fw + Sc × Sw + Vc × Vw> Th where Fw + Sw + Vw = 1.0 where Fc: reliability of fire determination, Fw: weighting factor of fire determination, and Sc: smoke determination of smoke determination Reliability, Sw: weight coefficient for smoke determination, Vc: reliability for stop vehicle determination, Vw: weight coefficient for stop vehicle determination, Th: threshold for fire occurrence determination.

For the reliability of each judgment, for example, in the case of flame detection, the fluctuation ratio in the fluctuation detection area is used, and when the ratio is 100%, the reliability is set to 100%. These determination results are used as a fire occurrence when any one of the flame determination and the smoke determination satisfies the determination condition, and is used as a primary alarm for smoke detection and a secondary alarm for flame detection. As described above, by using several fire determination methods in combination, it is possible to obtain a fire detection device capable of more reliably determining the occurrence of a fire.

Further, as the smoke detecting means, the number of lines whose edge intensity change rate is equal to or less than a predetermined value is equal to or more than a predetermined value,
If the rate of increase in the number of lines in which the edge intensity change rate is equal to or less than a predetermined value within a predetermined time is within a predetermined range, it is determined that smoke is generated. A fire detecting device capable of more reliably determining a fire occurrence by removing unnecessary information can be obtained.

[0047]

As described above, according to the first aspect of the present invention, there is provided an image pickup unit for picking up an image of a monitoring area, and a frame memory for storing image data of an original image picked up by the image pickup unit. In a fire detection device for detecting a luminescent spot, a luminescent spot extracting means for extracting a pixel having a brightness of a predetermined level or more continuously for a predetermined time or more from a plurality of image data as a luminescent spot, A fluctuation detection area setting means for providing a fluctuation detection area for a width, and a fluctuation pixel for extracting a fluctuation pixel in which the number of times the luminance of a pixel in the fluctuation detection area fluctuates above and below a reference luminance value within a predetermined time is equal to or more than a predetermined value. Extraction means and fire determination means for determining that a fire has occurred when the total number of fluctuation pixels in the fluctuation detection area is equal to or greater than a predetermined number. A fire is detected when the above fluctuations are present, so it is possible to remove the effects of reflections and synthesis by surrounding objects such as other vehicles, and to accurately identify the fire occurrence and its position. A device can be obtained.

According to the second aspect of the present invention, a bright spot area creating means for creating a bright spot area by connecting adjacent ones of four neighboring pixels or eight neighboring pixels to a pixel to be a bright spot, Since the fluctuation detection area creating means for creating a fluctuation detection area of a predetermined width adjacent to the outside of the point area is provided, it is possible to obtain a fire detection device capable of more accurately specifying a fire occurrence and its position. .

According to the third aspect, the background image storing means for storing the original image having no flame as the background image, and the means for forming a difference image between the original image and the background image stored in the frame memory. Since the bright point extracting means for extracting pixels having a predetermined threshold or more as a bright point continuously for a predetermined time or more in the difference image is provided, it is possible to remove a high-luminance area other than the flame area from the processing target. Thus, it is possible to obtain a fire detection device capable of preventing erroneous detection and accurately specifying a fire occurrence and its position.

According to the fire detecting apparatus of the fourth invention, the fluctuation pixel content ratio calculating circuit for calculating the fluctuation pixel content ratio of the number of fluctuation pixels existing in the fluctuation detection region for each bright spot region with respect to the area of the fluctuation detection region. Is provided, it is possible to obtain a fire detection device capable of accurately specifying the occurrence of a fire.

According to the fire detecting apparatus of the fifth invention, a stopped vehicle detecting means for detecting a stop of the vehicle and detecting a stop position of the vehicle, and a fire detection range setting for setting a fire detection range at the vehicle stop position With the provision of means,
A fire detection device capable of specifying a fire occurrence and its occurrence position in a short time can be obtained.

According to the fire detecting apparatus of the sixth aspect, the background image recording means for holding an image free of smoke as a background image, and a coefficient corresponding to a change in density for each pixel with respect to the background image A background update unit for performing an update by multiplying, an edge extraction unit for obtaining an edge strength for each pixel of the image to be processed and the background image, a line setting unit for setting a plurality of lines on a screen, Edge intensity change rate extraction means for calculating the ratio of the sum of the edge intensity values of each pixel of the original image to the sum of the edge intensity values of each pixel of the background image; and the number of lines whose edge intensity change rate is equal to or less than a predetermined value. A smoke detection device that can determine that a fire has occurred even when a flame cannot be directly observed can be obtained because the smoke detection means that smoke is generated when the value is equal to or more than a predetermined value is provided.

According to the fire detecting apparatus of the seventh aspect, the background image storing means for storing the image free from smoke as the background image, the edge image for each pixel of the original image and the background image stored in the frame memory Edge extraction means for determining the intensity; line setting means for setting a plurality of observation lines on the screen to be measured; for each observation line, each pixel of the original image with respect to the sum of the edge intensity values of each pixel of the background image Edge intensity change rate extraction means for obtaining an edge intensity change rate that is a ratio of the sum of the edge intensity values, and when the number of lines whose edge intensity change rate is equal to or less than a predetermined value is equal to or greater than a predetermined value, smoke is generated. Smoke detection means for determining whether a fire has occurred when smoke generation continues for a predetermined time or more, and when the total number of fluctuation pixels in the fluctuation detection area is equal to or more than a predetermined number. And a flame / fire determining means for determining that a fire has occurred when the ratio of the fluctuation pixels existing in the fluctuation detection area to the area of the fluctuation area and the fluctuation detection area of the fluctuation point area is equal to or greater than a predetermined value. Therefore, it is possible to obtain a fire detection device that can more reliably determine the occurrence of a fire.

According to the fire detecting apparatus of the eighth aspect, the number of lines whose edge intensity change rate is equal to or less than a predetermined value is equal to or more than a predetermined value, and the edge intensity change rate in a predetermined time is equal to or less than a predetermined value. To provide a fire detection device capable of removing transient information and providing a more reliable determination of fire occurrence because it has smoke detection means that generates smoke when the rate of increase in the number of lines is within a predetermined range. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a fire detection device according to a first embodiment.

FIG. 2 is a diagram showing a structure of a flame when a fire occurs.

FIG. 3 is a block diagram illustrating a configuration of a fire detection device according to a second embodiment.

FIG. 4 is a block diagram illustrating a configuration of a fire detection device according to a third embodiment.

FIG. 5 is a diagram showing a relationship between a stopped vehicle and a fire detection area.

FIG. 6 is a block diagram illustrating a configuration of a fire detection device according to a fourth embodiment.

FIG. 7 is a diagram in which a processing line for observation is provided on a road in a monitoring area.

FIG. 8 is a block diagram illustrating a configuration of a fire detection device according to a fifth embodiment.

FIG. 9 is a block diagram showing a configuration of a conventional fire detection device.

[Explanation of symbols]

1 TV camera, 2 TV camera control circuit, 3 frame memory, 6
Background image storage circuit, 7 background update circuit,
8 background difference circuit, 9 bright spot extraction circuit,
10 bright spot area creation circuit, 11 fluctuation detection area creation circuit, 12 fluctuation pixel extraction circuit,
12a fluctuation pixel content calculation circuit, 13a flame fire determination circuit, 13b smoke fire determination circuit, 30
Vehicle extraction circuit, 32 fire detection area creation circuit,
50 edge creation circuit, 51 background edge creation circuit, 52 processing line setting circuit, 53 edge strength sum calculation circuit, 54 edge strength change rate calculation circuit, 55 smoke determination circuit, 70
Comprehensive fire judgment circuit.

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Claims (8)

[Claims] 1. A fire detection device that has an imaging unit that images a monitoring area, a frame memory that stores image data of an original image captured by the imaging unit, and detects a fire occurrence from the image data. A bright spot extracting means for extracting pixels exhibiting a luminance of a predetermined level or more continuously for a predetermined time or more from the image data as a bright point, and a fluctuation detection providing a fluctuation detection area of a predetermined width adjacent to the outside of the bright point Region setting means, and fluctuation pixel extraction means for extracting a fluctuation pixel in which the number of times the luminance of a pixel in the fluctuation detection area fluctuates above and below a reference luminance value within a predetermined time is equal to or more than a predetermined value, and the fluctuation detection area And a flame / fire judging means for judging that a fire has occurred when the total number of the fluctuation pixels is equal to or greater than a predetermined number. 2. A bright spot area creating means for creating a bright spot area by connecting four or eight neighboring pixels adjacent to a pixel to be a bright spot, and an outside of each of the bright spot areas. 2. The fire detection device according to claim 1, further comprising a fluctuation detection area creating unit that creates a fluctuation detection area having a predetermined width adjacent to the detection area. 3. A background image storage means for storing an original image having no flame as a background image; a means for forming a difference image between the original image stored in a frame memory and the background image; 3. A fire detection device according to claim 1, further comprising a bright spot extracting means for extracting a pixel having a brightness not lower than a predetermined threshold value as a bright point continuously for a predetermined time or more. apparatus. 4. A fluctuation pixel content ratio calculating circuit for calculating a fluctuation pixel content ratio of the number of fluctuation pixels present in the fluctuation detection region for each bright spot region with respect to the area of the fluctuation detection region, and based on the fluctuation pixel content ratio The fire detection device according to claim 1, wherein the occurrence of a fire is determined by using the fire detection device. 5. A method according to claim 1, further comprising the steps of: detecting a stop of the vehicle and detecting a stop position of the vehicle; and a fire detection range setting unit for setting a fire detection range at the vehicle stop position. 3. The fire detection device according to claim 1, wherein a fire is detected based on original image data within the range. 6. A fire detecting apparatus for detecting an occurrence of a fire from an image capturing unit for capturing an image of a monitoring area, a frame memory for storing image data of an original image captured by the image capturing unit, and detecting the occurrence of a fire from the image data. Background image storage means for storing an original image not to be used as a background image, edge extraction means for obtaining edge strength for each pixel of the original image and the background image, and line setting means for setting a plurality of observation lines on a screen to be measured Edge intensity change rate extraction means for obtaining an edge intensity change rate that is a ratio of the sum of the edge intensity values of the pixels of the original image to the sum of the edge intensity values of the pixels of the background image for each of the observation lines; When the number of observation lines in which the edge intensity change rate is equal to or less than a predetermined value is equal to or more than a predetermined value, smoke detection means for generating smoke; A fire detection device equipped with smoke fire determination means for determining that a fire has occurred if continued. 7. A background image storing means for storing an image free of smoke as a background image, an edge extracting means for obtaining an edge strength for each pixel of the original image and the background image stored in the frame memory, and a measured object. A line setting means for setting a plurality of observation lines on a screen, and for each of the observation lines, a ratio of a sum of edge intensity values of each pixel of the original image to a sum of edge intensity values of each pixel of the background image. Edge intensity change rate extraction means for obtaining an edge intensity change rate, and smoke detection means for generating smoke when the number of lines whose edge intensity change rate is equal to or less than a predetermined value is equal to or greater than a predetermined value, A smoke fire determining means for determining that a fire has occurred when smoke has continued for a predetermined time or more, and when the total number of fluctuation pixels in the fluctuation detection area is equal to or more than a predetermined number,
Or a flame / fire judging means for judging that a fire has occurred when the area of the bright spot area and the ratio of the fluctuation pixels present in the fluctuation detection area to the fluctuation detection area are greater than or equal to a predetermined value, The fire detection device according to any one of claims 1 to 5, wherein a fire occurrence is determined based on the determination results of the smoke fire determination unit and the flame fire determination unit. 8. The rate of increase in the number of lines whose edge intensity change rate is equal to or less than a predetermined value is equal to or greater than a predetermined value, and the number of lines whose edge intensity change rate is equal to or less than a predetermined value in a predetermined time is within a predetermined range. 8. The fire detecting device according to claim 6, further comprising smoke detecting means for generating smoke at a certain time.