JP2006085608A - Apparatus and method for detecting smoke, system and method for distinguishing between mist and smoke, and programs therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a smoke detecting apparatus capable of correctly detecting existence of smoke to find a fire in an early stage. <P>SOLUTION: The smoke detecting apparatus for detecting the existence of smoke includes a first imaging part for obtaining a plurality of first photographed images by receiving light having a first wavelength band and continuously imaging a subject; a second imaging part for obtaining a plurality of second photographed images by receiving light having a second wavelength band, which has a longer wavelength than the first one, and continuously imaging the subject; changing amount calculation sections for calculating the changing amount of frequency components within a given period among the plurality of the first photographed images and the changing amount of frequency components within a given period among the plurality of second photographed images, respectively; and a smoke detecting section for detecting generation of smoke within an imaged area of the first imaging part and the second imaging part, based on the changing amount of frequency components among the plurality of first photographed images and the changing amount of frequency components among the plurality of second photographed images calculated by the changing amount calculation sections. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a smoke detection device, a smoke detection method, a fog detection system, a fog detection method, and a program. In particular, the present invention relates to a smoke detection device and a smoke detection method for detecting the presence of smoke, a program for the smoke detection device, a fog smoke discrimination system and a fog smoke discrimination method for discriminating fog and smoke, and the fog smoke discrimination system Related to the program.

Conventionally, there has been proposed a fire detection device that detects the occurrence of a fire by detecting the generation of smoke using a smoke detector (see, for example, Patent Document 1). In such a fire detection device, when smoke flows into the dark box, the light projected by the light projecting element is irregularly reflected by the smoke flowing into the dark box, and the light receiving element receives the irregularly reflected light and outputs a current. This detects smoke and detects the occurrence of a fire.
JP 2000-67339 A

  However, the cause of fire in recent years is often due to arson. In such a case, a fire is generated from the outside of the building. In the fire detection device using the smoke detector as described above, it detects smoke that fills the inside of the building, so it can detect the fire that occurred inside the building, but it occurred from the outside of the building due to arson. The fire cannot be detected early.

  Therefore, an object of the present invention is to provide a smoke detection device, a smoke detection method, a fog smoke discrimination system, a fog smoke discrimination method, and a program that can solve the above problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.

  According to the first aspect of the present invention, there is provided a smoke detection device that detects the presence of smoke, and receives a plurality of first captured images by receiving light in a first wavelength band and continuously imaging a subject. A first imaging unit to acquire, and a second imaging unit to acquire a plurality of second captured images by receiving light in a second wavelength band having a wavelength longer than the first wavelength band and continuously imaging the subject A change amount calculation unit that calculates a change amount of the frequency component in a predetermined time between the plurality of first captured images and a change amount of the frequency component in the predetermined time between the plurality of second captured images, and a change amount calculation Based on the amount of change in the frequency component between the plurality of first captured images calculated by the unit and the amount of change in the frequency component between the plurality of second captured images within the imaging region of the first imaging unit and the second imaging unit A smoke detector for detecting that smoke has been generated.

  The smoke detection unit is configured such that a reduction amount of a high frequency component of a predetermined frequency or more between the plurality of first captured images is larger than a predetermined amount than a reduction amount of a high frequency component of the predetermined frequency or more between the plurality of second captured images. In this case, it may be detected that smoke is generated in the imaging regions of the first imaging unit and the second imaging unit.

  The smoke detection unit has a predetermined amount higher than a reduction amount of a low frequency component that is smaller than a predetermined frequency between a plurality of first captured images, with a reduction amount of a high frequency component that is equal to or higher than a predetermined frequency between the plurality of first captured images. When larger than this, it may be detected that smoke is generated in the imaging regions of the first imaging unit and the second imaging unit.

  The first imaging unit may receive visible light and image a subject, and the second imaging unit may receive infrared light and image the subject.

  A first light source that projects light of the first wavelength band onto the subject; and a second light source that projects light of the second wavelength band onto the subject. The first imaging unit projects the first light source. The first captured image may be acquired when the light is shining, and the second imaging unit may acquire the second captured image when the second light source is projecting light.

  According to a second aspect of the present invention, there is provided a smoke detection method for detecting the presence of smoke, wherein a plurality of first captured images are obtained by receiving light in a first wavelength band and continuously imaging a subject. Acquiring a plurality of second captured images by receiving light in a second wavelength band having a wavelength longer than the first wavelength band and continuously imaging the subject; and a plurality of first images A step of calculating a change amount of a frequency component within a predetermined time between captured images and a change amount of a frequency component within a predetermined time between a plurality of second captured images, and the calculated frequency between the plurality of first captured images. Detecting the occurrence of smoke in the imaging region of the first imaging unit and the second imaging unit based on the component variation and the frequency component variation between the plurality of second captured images.

  According to a third aspect of the present invention, there is provided a program for a smoke detection device for detecting the presence of smoke, wherein the smoke detection device receives light in the first wavelength band and continuously images a subject. A first imaging unit that acquires a plurality of first captured images by receiving light in a second wavelength band having a wavelength longer than the first wavelength band, and continuously imaging the subject to thereby capture a plurality of second captured images. Change amount calculation for calculating a change amount of a frequency component in a predetermined time between a plurality of first captured images and a change amount of a frequency component in a predetermined time between the plurality of second captured images. The first imaging unit and the second imaging unit based on the amount of change in the frequency component between the plurality of first captured images calculated by the unit and the amount of change calculation unit, and the amount of change in the frequency component between the plurality of second captured images. A smoke detector for detecting the occurrence of smoke in the imaging area of To function Te.

  According to a fourth aspect of the present invention, there is provided a fog smoke discrimination system for discriminating fog and smoke, and sequentially imaging a plurality of locations around a building and acquiring a plurality of captured images, respectively. A density calculation unit that calculates a change in smoke or fog density in each imaging region of the plurality of imaging units based on a plurality of captured images captured by each of the plurality of imaging units, and a plurality of imaging units The increase amount of smoke or fog density in the imaging region of one of the imaging units is greater than a predetermined value than the increase amount of smoke or fog concentration in the imaging region of the other imaging unit among the plurality of imaging units. In this case, a fog smoke determination unit that determines that smoke is generated in the vicinity of the imaging region of one imaging unit.

  A frequency distribution calculating unit that calculates the distribution of frequency components of the plurality of captured images based on the plurality of captured images captured by the plurality of imaging units, respectively, and the density calculating unit includes the plurality of calculated amount of variation calculated by the change amount calculating unit. Based on the change in the distribution of the frequency components of the captured image, the smoke or fog concentration in each imaging region of the plurality of imaging units may be calculated.

  According to a fifth aspect of the present invention, there is provided a method for distinguishing fog and smoke, wherein a plurality of locations around a building are successively imaged by a plurality of imaging units, and a plurality of imaging units. Calculating smoke or fog density in each imaging region of the plurality of imaging units based on a plurality of captured images captured by each of the imaging units, and smoke in the imaging region of one imaging unit among the plurality of imaging units Alternatively, when the amount of increase in the fog density is greater than the amount of increase in smoke or fog density in the imaging region of the other imaging unit among the plurality of imaging units by a predetermined value or more, near the imaging region of one imaging unit Determining that smoke is generated.

  According to a sixth aspect of the present invention, there is provided a program for a fog smoke discrimination system that discriminates fog and smoke, and each of the fog smoke discrimination system images a plurality of locations around a building and acquires captured images respectively. A plurality of imaging units, a density calculating unit that calculates smoke or fog density in each imaging region of the plurality of imaging units based on a plurality of captured images captured by each of the plurality of imaging units, and a plurality of imaging units The increase amount of smoke or fog density in the imaging region of one of the imaging units is greater than a predetermined value than the increase amount of smoke or fog concentration in the imaging region of the other imaging unit among the plurality of imaging units. In this case, it is made to function as a fog smoke determining unit that determines that smoke is generated in the vicinity of the imaging region of one imaging unit.

  Note that the above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  According to the present invention, it is possible to detect the presence of smoke accurately and detect a fire at an early stage.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the claimed invention, and all combinations of features described in the embodiments are inventions. It is not always essential to the solution.

  FIG. 1 shows an example of a usage environment of a smoke detection device 100 according to the first embodiment of the present invention. The smoke detection device 100 is installed on, for example, a roof of a building or a fence surrounding the building, and images a wall surface of the building by each of a plurality of imaging units each having a light receiving element having a different detectable wavelength band, and a plurality of imaging Get an image. Then, the smoke detection device 100 compares and analyzes a plurality of captured images of the wall surface of the building to determine whether a fire has occurred. When the smoke detection device 100 detects the occurrence of a fire, it may be notified to the owner of the building via a communication line such as the Internet, or may be notified to a security company or a police station.

  Of the components included in the smoke detection apparatus 100, only the imaging function may be installed on the roof of a building or a fence surrounding the building, and other functions may be realized by a personal computer or the like in the building. Moreover, the imaging function of the smoke detection apparatus 100 may be shared with a surveillance camera of a security system that monitors an intruder into a building. Thereby, the cost of the smoke detection apparatus 100 or a crime prevention system can be reduced.

  FIG. 2 shows an example of the configuration of the smoke detection device 100 according to the first embodiment. The smoke detection apparatus 100 includes a first light source 200, a first imaging unit 202, a first captured image holding unit 204, a first frequency component calculation unit 206, a first change amount calculation unit 208, a second light source 210, and a second imaging unit. 212, a second captured image holding unit 214, a second frequency component calculation unit 216, a second change amount calculation unit 218, and a smoke detection unit 220.

  The first light source 200, the first imaging unit 202, the second light source 210, and the second imaging unit 212 are configured as shown in FIG. 1 in order to image the building from the outside or project the building from the outside. Provided outside. On the other hand, the first captured image holding unit 204, the first frequency component calculating unit 206, the first change amount calculating unit 208, the second captured image holding unit 214, the second frequency component calculating unit 216, the second change amount calculating unit 218, The smoke detection unit 220 may be provided outside the building together with the first light source 200, the first imaging unit 202, the second light source 210, and the second imaging unit 212, or the first light source 200 such as the inside of the building. The first imaging unit 202, the second light source 210, and the second imaging unit 212 may be provided at different locations.

  Hereinafter, the operation of the components included in the smoke detection device 100 will be described. The first imaging unit 202 acquires a plurality of first captured images by receiving light in the first wavelength band and continuously imaging the subject. In addition, the second imaging unit 212 acquires a plurality of second captured images by receiving light in a second wavelength band having a wavelength longer than the first wavelength band and continuously imaging the subject. The first imaging unit 202 and the second imaging unit 212 are preferably adjusted in focus on the same subject, and simultaneously capture the same subject to obtain a plurality of first captured images and second captured images.

  For example, the first imaging unit 202 receives visible light with a visible light CCD and images a subject, and the second imaging unit 212 receives infrared light with an infrared light CCD and images the subject. In another example, the first imaging unit 202 receives visible light through a filter that transmits the blue light wavelength band and images the subject, and the second imaging unit 212 transmits the red light wavelength band. The subject may be imaged by receiving visible light through a filter.

  The first captured image holding unit 204 holds the first captured image acquired by the first imaging unit 202. The second captured image holding unit 214 holds the second captured image acquired by the second imaging unit 212. Then, the first frequency component calculation unit 206 calculates a histogram of the spatial frequencies of the plurality of first captured images held by the first captured image holding unit 204. Further, the second frequency component calculation unit 216 calculates a histogram of the spatial frequencies of each of the plurality of second captured images held by the second captured image holding unit 214.

  Based on the spatial frequency histograms of the plurality of first captured images calculated by the first change amount calculation unit 208, the first change amount calculation unit 208 changes the frequency component within a predetermined time between the plurality of first captured images. Calculate the amount. The second change amount calculation unit 218 also uses the frequency components in a predetermined time between the plurality of second captured images based on the spatial frequency histograms of the plurality of second captured images calculated by the second change amount calculation unit 218. The amount of change is calculated.

  The smoke detection unit 220 includes a frequency component change amount between the plurality of first captured images calculated by the first change amount calculation unit 208 and a frequency between the plurality of second captured images calculated by the second change amount calculation unit 218. Based on the change amount of the component, it is detected that smoke is generated in the imaging areas of the first imaging unit 202 and the second imaging unit 212.

  Specifically, the smoke detection unit 220 has a reduction amount of a high frequency component of a predetermined frequency or higher between the plurality of first captured images, more than a reduction amount of a high frequency component of the predetermined frequency or more between the plurality of second captured images. When the amount is larger than the predetermined amount, it is detected that smoke is generated in the imaging areas of the first imaging unit 202 and the second imaging unit 212.

  Since the light received by the first imaging unit 202 has a short wavelength, it is likely to be irregularly reflected by smoke generated in the imaging region. On the other hand, since the light received by the second imaging unit 212 has a longer wavelength than the light received by the first imaging unit 202, the light received by the first imaging unit 202 is diffusely reflected by smoke generated in the imaging region. It is hard to do. For this reason, when smoke is generated in the imaging region, the image of the subject in the first captured image captured by the first imaging unit 202 is easily blurred and the high-frequency component is greatly reduced, but the second imaging unit 212 The subject image in the captured second captured image is difficult to blur, and the reduction amount of the high-frequency component is small. By utilizing this, the presence of smoke in the imaging region can be detected.

  Further, when the first imaging unit 202 receives visible light and images the subject, the visible light reflected from the subject is greatly reduced when the subject enters the shade. In this case, when the contrast of the first captured image is decreased, the decrease amount of the high-frequency component equal to or higher than the predetermined frequency between the plurality of first captured images is increased. Therefore, the smoke detection unit 220 preliminarily has a reduction amount of a high frequency component that is equal to or higher than a predetermined frequency between the plurality of first captured images than a reduction amount of a low frequency component that is smaller than the predetermined frequency between the plurality of first captured images. When the amount is larger than the predetermined amount, it is detected that smoke is generated in the imaging regions of the first imaging unit 202 and the second imaging unit 212. Thereby, the smoke detector 220 can detect the presence of smoke in the imaging region without erroneous detection.

  The first light source 200 projects light in the first wavelength band onto the subject. The first imaging unit 202 acquires a plurality of first captured images by receiving light in the first wavelength band and continuously imaging the subject when the first light source 200 is projecting light. May be. Further, the second light source 210 projects light of a second wavelength band having a wavelength longer than the first wavelength band onto the subject. Then, when the second light source 210 is projecting light, the second imaging unit 212 receives light in the second wavelength band and continuously captures the subject to obtain a plurality of second captured images. May be. In this case, the first imaging unit 202 and the second imaging unit 212 are adjusted in focus on the same subject, and continuously capture the same subject alternately to obtain a plurality of first captured images and second captured images. It is preferable to obtain. Thereby, the first captured image and the second captured image can be captured more clearly, and the presence of smoke in the imaging region can be detected more accurately.

  FIG. 3 shows an example of a change in sharpness between captured images according to the first embodiment. FIG. 4 shows an example of a spatial frequency histogram of the captured image according to the first embodiment. When smoke is generated in the imaging regions of the first imaging unit 202 and the second imaging unit 212, as shown in FIG. 3, the sharpness of the first captured image and the second captured image is weakened. As shown in FIG. 4, in the spatial frequency histogram of the captured image, the power reduction amount in the portion with the high spatial frequency is larger than the power reduction amount in the portion with the low spatial frequency. Further, the amount of power reduction in the portion where the spatial frequency of the first captured image captured by receiving light having a shorter wavelength is larger than the spatial frequency of the second captured image captured by receiving light having a longer wavelength. Is larger than the amount of power reduction in the large portion. In such a case, the smoke detection unit 220 can determine that smoke has occurred in the imaging regions of the first imaging unit 202 and the second imaging unit 212.

  FIG. 5 shows an example of a change in contrast between captured images according to the first embodiment. FIG. 6 illustrates an example of a spatial frequency histogram of the captured image according to the first embodiment. When the imaging regions of the first imaging unit 202 and the second imaging unit 212 become dark, as shown in FIG. 5, the contrast between the first captured image and the second captured image becomes weak. Then, as shown in FIG. 6, in the histogram of the spatial frequency of the captured image, the power of the portion with the high spatial frequency and the power of the portion with the low spatial frequency are substantially evenly reduced. Also, the power of the portion of the first captured image that is captured by receiving light having a shorter wavelength and the portion of the second captured image that is captured by receiving light having a longer wavelength are large. The power changes in accordance with the change in the wavelength distribution of the light irradiated in the imaging regions of the first imaging unit 202 and the second imaging unit 212. Therefore, in such a case, the smoke detection unit 220 can determine that the change in the spatial frequency of the first captured image and the second captured image is not due to the generation of smoke.

  FIG. 7 shows an example of a use environment of the fog smoke discrimination system 700 according to the second embodiment of the present invention. For example, the fog detection system 700 captures a wall surface of a building by each of a plurality of imaging units 702 installed on a roof of a building or a fence surrounding the building, and acquires a plurality of captured images. The fog smoke discrimination system 700 analyzes a plurality of captured images of the wall surface of the building, and calculates the distribution of soot such as fog and smoke generated around the building. The fog smoke discrimination system 700 discriminates fog and smoke based on the state of distribution of soot such as fog and smoke generated around the building, and determines whether or not a fire has occurred. When the fog detection system 700 detects the occurrence of a fire, it may be notified to the owner of the building via a communication line such as the Internet, or may be notified to a security company or a police station.

  Of the components included in the fog detection system 700, only the imaging function may be installed on the roof of a building or a fence surrounding the building, and the other functions may be realized by a personal computer or the like in the building. Further, the imaging function of the fog detection system 700 may be shared with a surveillance camera of a security system that monitors an intruder into a building. Thereby, the cost of the fog detection system 700 or the crime prevention system can be reduced.

  FIG. 8 shows an example of the configuration of the fog determination system 700 according to the second embodiment. The fog smoke determination system 700 includes a plurality of imaging units 702, a captured image holding unit 704, a frequency distribution calculation unit 800, a density calculation unit 802, and a fog smoke determination unit 804. Note that the plurality of imaging units 702 are provided outside the building as shown in FIG. 7 in order to capture the building from the outside or project the building from the outside. On the other hand, the frequency distribution calculation unit 800, the density calculation unit 802, and the fog smoke determination unit 804 may be provided outside the building together with the plurality of imaging units 702, or a plurality of imaging units 702 such as the inside of the building. It may be provided in different places.

  Hereinafter, the operation of the components included in the fog determination system 700 will be described. The plurality of imaging units 702 continuously capture a plurality of locations around the building, and acquire a plurality of captured images, respectively. And the some captured image holding | maintenance part 704 each hold | maintains the some captured image which the some imaging part 702 imaged, respectively.

  The frequency distribution calculating unit 800 calculates the distribution of the frequency components of the spatial frequency of the plurality of captured images based on the plurality of captured images captured by the plurality of imaging units 702 and held by the plurality of captured image holding units 704, respectively. calculate. Then, the density calculation unit 802 calculates the amount of change in smoke or fog density in each imaging region of the plurality of imaging units 702 based on the distribution of frequency components of the plurality of captured images calculated by the frequency distribution calculation unit 800. To do.

  Specifically, the density calculation unit 802 determines that the smoke or fog density has decreased when the high-frequency component of the spatial frequency has increased between a plurality of continuously captured images, and continuously captures images. When the high frequency component of the spatial frequency decreases between the plurality of captured images, it is determined that the smoke or fog density has increased. More specifically, the density calculation unit 802 determines the smoke or fog density when the high frequency component of the spatial frequency increases relative to the low frequency component between a plurality of continuously captured images. It is determined that the density has decreased, and it is determined that the smoke or fog density has increased when the high-frequency component of the spatial frequency is relatively decreased with respect to the low-frequency component between a plurality of continuously captured images.

  The fog smoke determining unit 804 is configured such that the increase amount of smoke or fog density in the imaging region of one imaging unit 702 among the plurality of imaging units 702 is the imaging region of the other imaging unit 702 in the plurality of imaging units 702. It is determined that smoke is generated in the vicinity of the imaging region of one imaging unit 702 when it is greater than a predetermined value by an amount of increase in smoke or mist density. That is, when the smoke or fog density in the imaging regions of the plurality of imaging units 702 increases uniformly, it can be determined that fog due to fog has occurred around the building. On the other hand, when the smoke or fog density in the imaging regions of the plurality of imaging units 702 partially increases, it can be determined that smoke haze has occurred around the building. Therefore, the fog smoke discrimination system 700 can accurately discriminate between fog and smoke, and prevent erroneous detection of fire.

  FIG. 9 shows an example of a hardware configuration of a computer 1500 according to the first embodiment and the second embodiment. The computer 1500 includes a CPU peripheral unit including a CPU 1505, a RAM 1520, a graphic controller 1575, and a display device 1580 connected to each other by a host controller 1582, and a communication interface 1530 connected to the host controller 1582 by an input / output controller 1584. An input / output unit having a hard disk drive 1540 and a CD-ROM drive 1560, and a legacy input / output unit having a ROM 1510, a flexible disk drive 1550, and an input / output chip 1570 connected to the input / output controller 1584.

  The host controller 1582 connects the RAM 1520 to the CPU 1505 and the graphic controller 1575 that access the RAM 1520 at a high transfer rate. The CPU 1505 operates based on programs stored in the ROM 1510 and the RAM 1520 and controls each unit. The graphic controller 1575 acquires image data generated by the CPU 1505 and the like on a frame buffer provided in the RAM 1520 and displays the image data on the display device 1580. Alternatively, the graphic controller 1575 may include a frame buffer that stores image data generated by the CPU 1505 or the like.

  The input / output controller 1584 connects the host controller 1582 to the hard disk drive 1540, the communication interface 1530, and the CD-ROM drive 1560, which are relatively high-speed input / output devices. The hard disk drive 1540 stores programs and data used by the CPU 1505 in the computer 1500. The communication interface 1530 communicates with the smoke detection device 100 or the fog detection system 700 via the network, and provides a program and data to the smoke detection device 100 or the fog detection system 700. The CD-ROM drive 1560 reads a program or data from the CD-ROM 1595 and provides it to the hard disk drive 1540 and the communication interface 1530 via the RAM 1520.

  The input / output controller 1584 is connected to the ROM 1510, the flexible disk drive 1550, and the relatively low-speed input / output device of the input / output chip 1570. The ROM 1510 stores a boot program executed when the computer 1500 is started up, a program depending on the hardware of the computer 1500, and the like. The flexible disk drive 1550 reads a program or data from the flexible disk 1590 and provides it to the hard disk drive 1540 and the communication interface 1530 via the RAM 1520. The input / output chip 1570 connects various input / output devices via a flexible disk drive 1550 and, for example, a parallel port, a serial port, a keyboard port, a mouse port, and the like.

  A program provided to the communication interface 1530 via the RAM 1520 is stored in a recording medium such as the flexible disk 1590, the CD-ROM 1595, or an IC card and provided by the user. The program is read from the recording medium, provided to the communication interface 1530 via the RAM 1520, and transmitted to the smoke detection device 100 or the fog detection system 700 via the network. The program transmitted to the smoke detection device 100 or the fog smoke discrimination system 700 is installed and executed in the smoke detection device 100 or the fog smoke discrimination system 700.

  The program that is installed and executed in the smoke detection device 100 includes the smoke detection device 100, the first light source 200, the first imaging unit 202, the first captured image holding unit 204, the first frequency component calculation unit 206, and the first change. The amount calculation unit 208, the second light source 210, the second imaging unit 212, the second captured image holding unit 214, the second frequency component calculation unit 216, the second change amount calculation unit 218, and the smoke detection unit 220 are caused to function. The program that is installed and executed in the fog determination system 700 includes the imaging smoke determination system 700, the imaging unit 702, the captured image holding unit 704, the frequency distribution calculation unit 800, the density calculation unit 802, and the fog detection unit. Function as 804.

  The program shown above may be stored in an external storage medium. As the storage medium, in addition to the flexible disk 1590 and the CD-ROM 1595, an optical recording medium such as a DVD or PD, a magneto-optical recording medium such as an MD, a tape medium, a semiconductor memory such as an IC card, or the like can be used. Further, a storage device such as a hard disk or a RAM provided in a server system connected to a dedicated communication network or the Internet may be used as a recording medium, and the program may be provided to the computer 1500 via the network.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

It is a figure which shows an example of the utilization environment of the smoke detection apparatus. It is a figure which shows an example of a structure of the smoke detection apparatus. It is a figure which shows an example of the change of the sharpness between captured images. It is a figure which shows an example of the histogram of the spatial frequency of a captured image. It is a figure which shows an example of the change of the sharpness between captured images. It is a figure which shows an example of the histogram of the spatial frequency of a captured image. It is a figure which shows an example of the utilization environment of the fog smoke discrimination system. It is a figure which shows an example of a structure of the fog smoke discrimination system. 2 is a diagram illustrating an example of a hardware configuration of a computer 1500. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Smoke detection apparatus 200 1st light source 202 1st imaging part 204 1st captured image holding part 206 1st frequency component calculation part 208 1st variation calculation part 210 2nd light source 212 2nd imaging part 214 2nd captured image holding part 216 Second frequency component calculation unit 218 Second change amount calculation unit 220 Smoke detection unit 700 Fog smoke discrimination system 702 Imaging unit 704 Captured image holding unit 800 Frequency distribution calculation unit 802 Concentration calculation unit 804 Fog smoke discrimination unit

Claims (11)

A smoke detection device for detecting the presence of smoke,
A first imaging unit that receives light in the first wavelength band and continuously captures an image of a subject to obtain a plurality of first captured images;
A second imaging unit that receives light in a second wavelength band having a wavelength longer than that of the first wavelength band and continuously captures the subject to obtain a plurality of second captured images;
A change amount calculation unit that calculates a change amount of a frequency component within a predetermined time between the plurality of first captured images and a change amount of a frequency component within a predetermined time between the plurality of second captured images;
Based on the change amount of the frequency component between the plurality of first captured images calculated by the change amount calculation unit and the change amount of the frequency component between the plurality of second captured images, the first imaging unit and the first A smoke detection device comprising: a smoke detection unit that detects that smoke has been generated in an imaging region of an imaging unit. The smoke detection unit is configured such that a reduction amount of a high frequency component of a predetermined frequency or more between the plurality of first captured images is determined in advance than a reduction amount of a high frequency component of the predetermined frequency or more between the plurality of second captured images. 2. The smoke detection device according to claim 1, wherein when the amount is larger than the amount, the smoke detection device detects that smoke is generated in an imaging region of the first imaging unit and the second imaging unit. The smoke detection unit is configured so that a reduction amount of a high frequency component equal to or higher than a predetermined frequency between the plurality of first captured images is smaller than a reduction amount of a low frequency component smaller than a predetermined frequency between the plurality of first captured images. 3. The smoke detection device according to claim 2, wherein when the amount is larger than a predetermined amount, the smoke detection device detects that smoke is generated in an imaging region of the first imaging unit and the second imaging unit. The first imaging unit receives visible light and images the subject,
The smoke detection apparatus according to claim 1, wherein the second imaging unit receives infrared light and images the subject. A first light source that projects light of the first wavelength band onto the subject;
A second light source for projecting light of the second wavelength band onto the subject,
The first imaging unit acquires the first captured image when the first light source is projecting,
The smoke detection apparatus according to claim 1, wherein the second imaging unit acquires the second captured image when the second light source is projecting light. A smoke detection method for detecting the presence of smoke,
Obtaining a plurality of first captured images by receiving light in a first wavelength band and continuously imaging a subject;
Receiving a second wavelength band of light having a wavelength longer than the first wavelength band and continuously capturing the subject to obtain a plurality of second captured images;
Calculating a change amount of a frequency component within a predetermined time between the plurality of first captured images and a change amount of a frequency component within a predetermined time between the plurality of second captured images;
Based on the calculated change amount of the frequency component between the plurality of first captured images and the change amount of the frequency component between the plurality of second captured images, the imaging of the first imaging unit and the second imaging unit. Detecting smoke generated in the area. A program for a smoke detection device that detects the presence of smoke,
The smoke detection device;
A first imaging unit that receives light in the first wavelength band and continuously captures a subject to obtain a plurality of first captured images;
A second imaging unit that receives light in a second wavelength band having a wavelength longer than the first wavelength band and continuously captures the subject to obtain a plurality of second captured images;
A change amount calculation unit that calculates a change amount of a frequency component within a predetermined time between the plurality of first captured images and a change amount of a frequency component within a predetermined time between the plurality of second captured images;
Based on the change amount of the frequency component between the plurality of first captured images calculated by the change amount calculation unit and the change amount of the frequency component between the plurality of second captured images, the first imaging unit and the first A program that functions as a smoke detection unit that detects that smoke has been generated in an imaging region of an imaging unit. A fog detection system for determining fog and smoke,
A plurality of imaging units that continuously capture a plurality of locations around the building and acquire a plurality of captured images,
Based on the plurality of captured images captured by each of the plurality of imaging units, a density calculating unit that calculates a change amount of smoke or fog density in each imaging region of the plurality of imaging units;
The increase amount of the smoke or fog density in the imaging region of one imaging unit among the plurality of imaging units is the increase amount of the smoke or fog concentration in the imaging region of the other imaging unit of the plurality of imaging units. A fog smoke discrimination system including a fog smoke discrimination unit that determines that smoke is generated in the vicinity of the imaging region of the one imaging unit when the value is larger than a predetermined value. A frequency distribution calculation unit that calculates a distribution of frequency components of the plurality of captured images based on the plurality of captured images captured by the plurality of imaging units;
The density calculation unit calculates smoke or fog density in each imaging region of the plurality of imaging units based on a change in distribution of frequency components of the plurality of captured images calculated by the change amount calculation unit. Item 10. The fog determination system according to Item 8. A method for distinguishing fog and smoke,
A step of continuously imaging a plurality of locations around the building by a plurality of imaging units,
Calculating smoke or fog concentration in each imaging region of the plurality of imaging units based on the plurality of captured images captured by each of the plurality of imaging units;
The increase amount of the smoke or fog density in the imaging region of one imaging unit among the plurality of imaging units is the increase amount of the smoke or fog concentration in the imaging region of the other imaging unit of the plurality of imaging units. And a step of determining that smoke is generated in the vicinity of the imaging region of the one imaging unit when greater than a predetermined value. A program for a fog detection system for determining fog and smoke,
The fog detection system,
A plurality of imaging units that respectively capture a plurality of locations around the building and acquire captured images,
Based on the plurality of captured images captured by each of the plurality of imaging units, a density calculation unit that calculates the density of smoke or fog in each imaging region of the plurality of imaging units,
The increase amount of the smoke or fog density in the imaging region of one imaging unit among the plurality of imaging units is the increase amount of the smoke or fog concentration in the imaging region of the other imaging unit of the plurality of imaging units. A program that functions as a fog smoke determination unit that determines that smoke is generated in the vicinity of the imaging region of the one imaging unit when the value is larger than a predetermined value.

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