JP2018010423A - Alarm system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alarm system capable of specifying the direction of a fire occurrence place.SOLUTION: An alarm system 100 includes a projection device 10 and an imaging apparatus 20. The projection device 10 includes a projection part 12 for projecting light to an imaging part 22 from a plurality of projection directions in a monitoring area. The imaging apparatus 20 includes an imaging part 22 for imaging the monitoring area, an imaging control part 241 for controlling the imaging part 22 so as to image a plurality of imaging directions corresponding to the plurality of projection directions in the monitoring area, an abnormality occurrence determination part 243 for determining the occurrence of abnormality in the monitoring area on the basis of the imaging result of the imaging part 22, and a notification part 244 for reporting the occurrence of the abnormality in the monitoring area on the basis of the determination result of the abnormality occurrence determination part 243.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an alarm system.

  Conventionally, a dimming sensor that outputs light to a reflector installed in a monitoring area and senses a fire in the monitoring area based on the intensity of the reflected light from the reflector is known. (For example, refer to Patent Document 1). The dimming sensor includes a light projecting unit and a light receiving unit. The light projecting unit outputs light to the reflecting plate, and the light reflected from the light projecting unit is reflected by the reflecting plate. The light receiving unit receives light from only one direction, and the occurrence of a fire in the monitoring area is detected based on the intensity of reflected light received by the light receiving unit.

JP 2009-20863 A

  However, in a conventional dimming sensor, it changes based on smoke reaching only one limited area in the monitoring area (eg, the area between the dimming sensor and the reflector). Based on the intensity of the reflected light, it only detected the fire occurrence itself, so it was difficult to specify the direction of the fire location in the monitoring area. For this reason, there has been room for improvement in the conventional dimming sensor in terms of specifying the direction of the fire place in the monitoring area.

  This invention is made | formed in view of the above, Comprising: It aims at providing the alarm system which becomes possible [specifying the direction of a fire place].

  In order to solve the above-described problems and achieve the object, an alarm system according to claim 1 includes an imaging unit that captures an image of a monitoring area, and a plurality of light projection directions in the monitoring area. Based on the imaging result of the imaging means, the imaging control means for controlling the imaging means so as to image a plurality of imaging directions corresponding to the plurality of projection directions in the monitoring area, An abnormality occurrence determination unit that determines the occurrence of an abnormality in the monitoring region, and a notification unit that notifies the occurrence of an abnormality in the monitoring region based on a determination result of the abnormality occurrence determination unit.

  The alarm system according to claim 2 is the alarm system according to claim 1, further comprising an abnormal direction determination unit that determines a direction in which an abnormality may occur in the monitoring region, and the imaging control unit Controls the imaging means so as to enlarge and image at least a part of the plurality of imaging directions based on the determination result of the abnormal direction determination means.

  According to a third aspect of the present invention, there is provided an alarm system according to the first or second aspect, further comprising imaging result output means for outputting an imaging result of the imaging means.

  According to the alarm system of claim 1, the imaging unit is projected so as to project the imaging unit from a plurality of light projecting directions in the monitoring region, and to capture a plurality of imaging directions corresponding to the plurality of light projecting directions. Since it controls, for example, it is possible to detect smoke in a plurality of directions, and it is possible to specify the direction of the fire location based on the direction in which the smoke is detected.

  According to the alarm system of the second aspect, since the imaging unit is controlled so as to magnify and capture at least a part of a plurality of imaging directions, for example, detection of smoke in a part of the directions The accuracy can be improved, and the detection accuracy of the occurrence of a fire can be improved.

  According to the alarm system of claim 3, since the imaging result of the imaging means is output, for example, based on the imaging result, the state of the monitoring area can be monitored, and the direction of the fire location is specified Is possible.

It is a figure which shows the example of installation of the alarm system which concerns on embodiment of this invention, (a) is a perspective view, (b) is a top view. It is a block diagram which shows the electrical structure of an alarm system functionally conceptually. FIG. 1B is a diagram illustrating an example of the angle of view of the imaging device. It is a flowchart of the alarm process of an alarm system.

  Hereinafter, embodiments of an alarm system according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments.

[Basic concept of the embodiment]
First, the basic concept of the embodiment will be described. The embodiment schematically includes an imaging unit that images a monitoring area, a light projecting unit that projects light from a plurality of light projecting directions, and an imaging control unit that controls the image capturing unit so as to capture a plurality of image capturing directions. An abnormality occurrence determining means for determining the occurrence of an abnormality in the monitoring area based on the imaging result of the imaging means; and an informing means for notifying the occurrence of the abnormality in the monitoring area based on the determination result of the abnormality occurrence determining means. It relates to an alarm system.

  Here, the “alarm system” is an alarm means for alarming an abnormality in the monitoring area, and corresponds to, for example, a sensor. “Sensor” is a sensing means that senses whether there is an abnormality in the monitoring area, for example, a fire sensor that senses fire by sensing smoke or heat, a gas leak sensor that senses gas, or a human body. This corresponds to a human sensor or the like. The “monitoring area” is an area to be monitored, and is a concept including, for example, a building room, a hallway, a staircase, and the like. “Abnormal” means something different from normal, for example, fire or gas leak.

  In the following embodiment, “abnormality” is “fire occurrence”, “alarm system” is “fire detector that senses fire by detecting smoke”, and “monitoring area” is The case where it is a “building room” will be described.

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

(Constitution)
First, the configuration of the alarm system according to the present embodiment will be described. FIG. 1 is a diagram illustrating an installation example of an alarm system according to the present embodiment, in which (a) is a perspective view and (b) is a plan view. In FIG. 1, the inner shape of a building room as the monitoring area 900, the light projecting devices 10A to 10D, and the imaging device 20 are illustrated by solid lines, and the optical axes of the light projecting devices 10A to 10D are indicated by alternate long and short dashed lines. It is shown in the figure. The alarm system 100 shown in FIG. 1 includes light projecting devices 10A to 10D and an imaging device 20. In addition, when it is not necessary to distinguish the light projectors 10A to 10D from each other, they will be collectively referred to as “light projector 10” and will be described below. Further, in the alarm system 100, an arbitrary number (that is, only one or a plurality) of the light projecting devices 10 is used based on the size or shape of the monitoring area 900 and the required fire sensitivity. However, below, the case where four light projection apparatuses 10 (namely, light projection apparatus 10A-10D) are used is demonstrated. Also, among the XYZ directions shown in FIG. 1A, the Z direction is the vertical direction, the + Z direction is the upper side, the -Z side is the lower side, X is the east-west direction, and + X is In the following description, it is assumed that the direction is the east side, -X is the west side, Y is the north-south direction, + Y is the north side, and -Y is the south side.

(Configuration-Projector)
First, the configuration of the light projecting devices 10A to 10D will be described. The light projecting devices 10 </ b> A to 10 </ b> D are light projecting units that project light, and are specifically installed in the monitoring area 900. The projectors 10A to 10D can be installed at arbitrary positions. Here, as shown in FIG. 1 (b), the projectors 10A to 10D are respectively a west wall W1 and a south side. The following description will be made on the assumption that they are installed on the wall W2, the east side wall W3, and the north side wall W4.

  FIG. 2 is a block diagram functionally conceptually showing the electrical configuration of the alarm system 100. As illustrated in FIG. 2, the light projecting device 10 includes a communication unit 11, a light projecting unit 12, a storage unit 13, and a control unit 14.

(Configuration-Projector-Communication unit)
The communication unit 11 is a communication unit that performs wireless communication with the imaging device 20, and includes, for example, a wireless communication circuit.

(Configuration-Projector-Projector)
The light projecting unit 12 is a light projecting unit that projects light. Specifically, the light projecting unit 12 projects light onto the imaging device 20 from a predetermined light projecting direction, and includes, for example, a light emitting diode and a light projecting lens. Configured. The “light projection direction” is a direction in which light is projected, and specifically, is the direction of the installation position of each light projection device 10 with respect to the installation position of the imaging device 20. The optical axis in the light projecting unit 12 of each light projecting device 10 is set in association with the light projecting direction. Specifically, the optical axis of the light projecting device 10A shown in FIG. 1B is set so as to project light from the west side of the image capturing device 20 as the light projecting direction to the image capturing device 20. The optical axis of the light projecting device 10B is set so as to project light onto the image capturing device 20 from the south side of the image capturing device 20 as the light projecting direction. The illuminating device 10D is set to project light from the east side of the imaging device 20 as the direction, and the optical axis of the projecting device 10D is from the north side of the imaging device 20 as the light projecting direction. Is set to emit light.

(Configuration-Projecting device-Storage unit)
Returning to FIG. 2, the storage unit 13 is a storage unit that stores a program and various data necessary for the operation of the light projecting device 10. The storage unit 13 can be configured using, for example, a hard disk (not shown) as an external storage device, and instead of or together with the hard disk, a magnetic storage medium such as a magnetic disk, or a DVD or Blu-ray disk. Any other storage medium including such an optical storage medium can also be used (in this regard, the storage units of other apparatuses and devices may be the same). The storage unit 13 stores identification information (hereinafter referred to as ID) for uniquely identifying itself.

(Configuration-Projector-Control unit)
The control unit 14 is a control unit that controls the light projecting device 10. Specifically, the control unit 14 includes a CPU, various programs that are interpreted and executed on the CPU (including a basic control program such as an OS and an application program that is activated on the OS and realizes a specific function), and This is a computer configured with an internal memory such as a RAM for storing programs and various data (this is the same for the control units of other devices and devices). In particular, the program according to the present embodiment is substantially installed in the light projecting device 10 via an arbitrary storage medium or network, thereby substantially configuring each unit (each function) of the control unit 14. The specific processing contents by the control unit 14 will be described later.

(Configuration-Imaging device)
Next, the configuration of the imaging device 20 will be described. The imaging device 20 is an imaging unit that captures an image of the monitoring area 900, and is specifically installed in the monitoring area 900. The imaging device 20 can be installed at an arbitrary position, but here, as shown in FIGS. 1A and 1B, at the approximate center of the XY plane on the ceiling of the monitoring area 900. It will be described below as being installed.

  As illustrated in FIG. 2, the imaging apparatus 20 includes a communication unit 21, an imaging unit 22, a storage unit 23, and a control unit 24.

(Configuration-Imaging device-Communication unit)
The communication unit 21 is a communication unit that performs wireless communication with the light projecting device 10 and includes, for example, a wireless communication circuit.

(Configuration-Imaging device-Imaging unit)
The imaging unit 22 is an imaging unit that captures an image. Specifically, the imaging unit 22 captures an imaging direction in the monitoring area 900. For example, the imaging unit 22 includes an image sensor and an optical system. Here, the “imaging direction” is a direction in which an image is taken and corresponds to the above-described light projecting direction, and specifically, an installation position of each light projecting device 10 with respect to an installation position of the imaging device 20. Direction. The “image sensor” detects the intensity of received light and outputs an electrical signal corresponding to the detection result. For example, the “image sensor” includes a photoelectric conversion circuit. The “optical system” is for setting the angle of view and the zoom magnification of the imaging unit 22 in order to capture the imaging direction in the monitoring area. For example, an optical lens provided in the previous stage of the image sensor, An adjustment mechanism for adjusting the focal length of the lens is provided.

  Here, “the angle of view of the image capturing unit 22” is a range of the monitoring area 900 captured by the image capturing unit 22. FIG. 3 is a diagram illustrating an example of the angle of view of the imaging device 20 in FIG. The angle of view of the imaging unit 22 can be arbitrarily set as long as the imaging direction described above can be captured, but here, for example, in a state where a zoom magnification described later is set to 1, the monitoring region 900 The following description will be made on the assumption that the entire area is set to be imaged. An arbitrary configuration can be used as the configuration of the imaging unit 22 for enabling imaging of the entire monitoring area 900. Here, for example, the monitoring area 900 is divided into four areas (that is, an area (that is, In order to image each of the first region 901 to the fourth region 904), four combinations of “image sensor” and “optical system” are provided, and the first region 901 to the fourth region are provided in each of the provided combinations. The following description will be made assuming that 904 is configured to take an image. Note that an “image sensor” and an “optical system” for imaging a first area 901, which will be described later, are referred to as a “first image sensor” and a “first optical system”, respectively. Also referred to as “first image data”, and “image sensor” and “optical system” for imaging the second region 902 described later are referred to as “second image sensor” and “second optical system”, respectively. The image data picked up by the above is called “second image data”, and “image sensor” and “optical system” for picking up a third region 903 to be described later are respectively “third image sensor” and “second image data”. 3 optical system ”, image data captured by these is referred to as“ third image data ”, and“ image sensor ”and“ optical system ”for imaging a fourth area 904, which will be described later, respectively. Referred to as the fourth image sensor "and the" fourth optical system ", the image data captured by these as referred to as" fourth image data "will be described below.

  The “first area” 901 is an area that is imaged as the first image data using the first image sensor and the first optical system, and includes the west side as the imaging direction. 3, within the angle range of the inner angle A on the horizontal plane (XY plane) and the depression angle (that is, the angle looking down with respect to the horizontal plane that is the ceiling on which the monitoring area 900 imaging device 20 is installed) 0 It is an area within a range of degrees to 90 degrees. The “second area” 902 is an area that is imaged as second image data using the second image sensor and the second optical system, and includes the south side as the imaging direction. Is a region within an angle range of an internal angle B and a range of a depression angle of 0 to 90 degrees on a horizontal plane. The “third region” 903 is a region that is imaged as third image data using the third image sensor and the third optical system, and includes the east side as the imaging direction. Is a region within an angle range of an internal angle C and a range of depression angles of 0 to 90 degrees on a horizontal plane. The “fourth region” 904 is a region that is imaged as the fourth image data using the fourth image sensor and the fourth optical system, and includes the north side as the imaging direction. Is a region within an angle range of an internal angle D and a range of depression angles of 0 to 90 degrees on a horizontal plane. In addition, about the above-mentioned interior angles AD, these combined angles (that is, the angle which added all the angles of interior angles AD) so that 360 degree omnidirectional in a horizontal surface can be imaged using the imaging device 20. Will be described below assuming that the angle is set to 360 degrees.

  Further, the “zoom magnification of the imaging unit 22” is an enlargement rate when the imaging target 22 is enlarged using the optical system of the imaging unit 22 for imaging. The magnification of the imaging unit 22 can be arbitrarily set as long as it can be enlarged in the above-described imaging direction. Here, for example, the focal lengths of the first to fourth optical systems of the imaging unit 22 are set. It is configured so that it can be adjusted stepwise (that is, each of the first area 901 to the fourth area 904 can be enlarged and imaged), and “zoom magnification” = “1 ×” or “zoom magnification” = “2 ×” A description will be given below of a configuration that can be set to either one.

(Configuration-Imaging device-Storage unit)
Returning to FIG. 2, the storage unit 23 is a storage unit that stores a program and various data necessary for the operation of the imaging apparatus 20. The storage unit 23 stores determination threshold value specifying information and installation direction specifying information.

  The “determination threshold specifying information” is information for specifying the determination threshold. The “determination threshold value” is a threshold value used in the determination regarding fire, specifically, a value set based on the intensity of light from the light projecting device 10, and more specifically, light projection. It is a value that is weaker (lower) than the intensity of light from the apparatus 10 (that is, “predetermined intensity” described later), and a value that is stronger (higher) than the intensity of disturbance light in the monitoring area 900. Here, “disturbance light” is light from other than the light projecting device 10 out of light in the monitoring area 900, and specifically, sunlight, light from a lighting device, and the like. The intensity of light from the light projecting device 10 will be described later. Any method can be used for setting the determination threshold value as long as it is a value that can determine the occurrence of a fire. The amount of light scattered by simulated fire smoke in the fire test, and the light projecting device 10 may be set based on the distance between the image pickup apparatus 20 and the imaging device 20 or the like. The determination threshold specifying information is stored when the user inputs it using an input unit (not shown) when the alarm system 100 is installed.

  The “installation direction specifying information” is information that specifies the direction of the installation position of the light projecting device 10, and specifically, information that specifies the direction of the installation position of the light projecting device 10 with respect to the installation position of the imaging device 20. It is. The installation position specifying information is stored when the user inputs the input position using an input unit (not shown) after grasping the installation position of each device when the alarm system 100 is installed. Here, as shown in FIG. 1B, for example, in the case where the light projecting device 10 is installed, as the installation direction specifying information, “light projecting device 10 </ b> A” = “west”, “light projecting device” The following description assumes that information specifying “10B” = “south”, “light projecting device 10C” = “east”, and “light projecting device 10D” = “north” is stored.

(Configuration-Imaging device-Control unit)
The control unit 24 is a control unit that controls the imaging device 20. In terms of functional concept, the control unit 24 includes an imaging control unit 241, an abnormal direction determination unit 242, an abnormality occurrence determination unit 243, and a notification unit 244. The imaging control unit 241 is an imaging control unit that controls the imaging unit 22 so as to capture a plurality of imaging directions corresponding to a plurality of light projecting directions in the monitoring area 900. The abnormal direction determination unit 242 is an abnormal direction determination unit that determines a direction in which an abnormality may have occurred in the monitoring area 900. The abnormality occurrence determination unit 243 is an abnormality occurrence determination unit that determines the occurrence of an abnormality in the monitoring area 900 based on the imaging result of the imaging unit 22. The notification unit 244 is a notification unit that notifies the occurrence of an abnormality in the monitoring area 900 based on the determination result of the abnormality occurrence determination unit 243, and in particular is an imaging result output unit that outputs the imaging result of the imaging unit 22. The specific processing contents by each unit of the control unit 24 will be described later.

(processing)
Next, alarm processing executed by the alarm system 100 configured as described above will be described. The “alarm process” is a process for performing an alarm, and specifically, a process for detecting a fire in the monitoring area 900 and notifying the detection result. This alarm process is executed after powering on the alarm system 100 and a receiver (not shown). Here, the “receiver” is a disaster prevention receiving means for disaster prevention. Specifically, on the basis of a signal from the alarm system 100, the receiver is inside or outside the building where the monitoring area 900 is provided. It notifies the occurrence of a fire. In the following description, it is assumed that immediately after the alarm system 100 is turned on, the zoom magnifications of the first to fourth optical systems of the imaging unit 22 in FIG. FIG. 4 is a flowchart of alarm processing of the alarm system 100. In the following, “step” is abbreviated as “S”.

  First, in SA1, the control unit 24 of the imaging device 20 causes all the light projecting devices 10 to project light. Specifically, the control unit 24 of the imaging device 20 in FIG. 2 transmits a light projection request command including the IDs of the light projecting devices 10 </ b> A to 10 </ b> D via the communication unit 21. Here, the “projection request command” is a command for requesting projection.

  On the other hand, it is assumed that the light projecting device 10 receives the above-described light projection request command via its own communication unit 11. The control unit 14 of the light projecting device 10 acquires the ID included in the received light projection request command, and determines whether the ID stored in the storage unit 13 is included in the acquired ID. To do. When the acquired ID includes an ID stored in its own storage unit 13, the control unit 14 of the light projecting device 10 receives light having a predetermined intensity from the light projecting unit 12 for a predetermined time (for example, several The drive current is supplied to the light emitting diode of the light projecting unit 12 for a predetermined time so that the light is output only for milliseconds (that is, the pulsed light is output only once). Here, the “predetermined intensity” is an intensity determined in advance as the intensity of light output from the light projecting unit 12, and a specific value can be arbitrarily set, but is distinguished from the disturbance light described above. In the following description, it is assumed that a value that is stronger (higher) than the intensity of disturbance light is set. On the other hand, when the acquired ID does not include the ID stored in its own storage unit 13, the control unit 14 of the light projecting device 10 supplies a drive current to the light emitting diode of the light projecting unit 12. Absent. Here, as described above, since the IDs of the light projecting devices 10A to 10D are included in the light projection request command, the light projecting devices 10A to 10D output light having a predetermined intensity for a predetermined time.

  Returning to FIG. 4, in SA <b> 2, the imaging control unit 241 of the imaging device 20 images the monitoring area 900. Specifically, as shown in FIG. 3 using the imaging unit 22 of FIG. 2 at a timing corresponding to the timing of executing SA1 (that is, in synchronization with SA1) so that the light output at SA1 can be captured. The first area 901 to the fourth area 904 are imaged at the zoom magnification set at the present time, and image data of the imaging result is acquired. Here, for example, as described above, at the present time (that is, immediately after the alarm system 100 is turned on), the zoom magnifications of the first to fourth optical systems of the imaging unit 22 in FIG. Therefore, the first image data that is the image data of the first area 901 captured with “zoom magnification” = “1 ×”, and the second image captured with “zoom magnification” = “1 ×”. Second image data, which is image data of the area 902, third image data, which is image data of the third area 903, captured at “zoom magnification” = “1 ×”, and “zoom magnification” = “1 ×” 4th image data which is the image data of the 4th field 904 imaged in (4) is acquired. As described above, since SA2 is performed in synchronization with SA1, the light from the light projecting devices 10A to 10D is reflected in each of the acquired first image data to fourth image data. As will be described later, it is possible to determine a fire by analyzing these image data.

  Returning to FIG. 4, in SA <b> 3, the abnormality occurrence determination unit 243 of the imaging device 20 determines the possibility of fire occurrence in the monitoring area 900. Specifically, based on each image data acquired in SA2, it is determined whether or not there is a possibility that a fire has occurred. Although any method can be used for this determination method, the following description will be made assuming that the determination method is focused on the intensity of light.

  Specifically, first, the maximum light intensity in each image data (hereinafter, maximum light intensity) is specified for each image data based on each image data acquired in SA2. Next, the maximum light intensity of each specified image data is acquired as the light reception intensity of light from the light projecting devices 10A to 10D. Specifically, the specified “maximum light intensity of the first image data” is acquired as the received light intensity of light from the light projecting device 10A, and the specified “maximum light intensity of the second image data” is obtained from the light projecting device 10B. Is obtained as the received light intensity of the light from the light projecting device 10C, and the specified “maximum light intensity of the fourth image data” is projected. Obtained as the received light intensity of the light from the optical device 10D. Next, the determination threshold value specified by the determination threshold value specification information stored in the storage unit 23 of FIG. 2 is acquired. Next, each of the acquired light reception intensities (that is, the light reception intensity of light from the apparatus 10A, the light reception intensity of light from the light projection apparatus 10B, the light reception intensity of light from the light projection apparatus 10C, and the light from the light projection apparatus 10D) Is compared with the obtained determination threshold value. Next, based on the comparison result, it is determined whether or not there is a possibility that a fire has occurred. Specifically, for the determination, if there is an acquired light receiving intensity that is less than the determination threshold, it is determined that the intensity of light from the light projecting device 10 is reduced due to light scattering by interference such as smoke, When it is determined that there is a possibility that a fire has occurred, on the other hand, if there is no acquired light reception intensity that is less than the determination threshold (that is, all of the light reception intensity is greater than or equal to the determination threshold), It is determined that light is not scattered by interference such as smoke, and it is determined that there is no possibility of a fire.

  If it is determined that there is no possibility of a fire using SA3 in FIG. 4 (NO in SA3), the process proceeds to SA1 and it is determined that a fire may have occurred. If so (YES in SA3), the process proceeds to SA4.

  Next, in SA4, the abnormal direction determination unit 242 of the imaging device 20 determines a direction in which a fire may have occurred. Specifically, the received light intensity that is less than the determination threshold value among the received light intensity used in the determination of SA3 is specified, and the installation direction specifying information stored in the storage unit 23 of FIG. 2 is referred to. The direction corresponding to the specified received light intensity is specified as the direction in which the fire is occurring. Here, for example, when the light reception intensity of light from the light projecting device 10A is less than the determination threshold value, “west” is specified, and the light reception intensity of light from the light projection device 10B is less than the determination threshold value. In this case, when “South” is specified and the light reception intensity of the light from the light projecting device 10C is less than the determination threshold, “East” is specified and the light reception intensity of the light from the light projection device 10D is less than the determination threshold. If it is, specify “north”.

  Returning to FIG. 4, in SA5, the imaging control unit 241 of the imaging device 20 changes the magnification of the imaging unit 22. Specifically, the magnification of the imaging unit 22 is changed so that the direction specified in SA4 is enlarged. Here, for example, when “West” is specified in SA4, the zoom magnification of the first optical system of the imaging unit 22 is changed from “1 ×” to “2 ×”, and “South” is specified in SA4. When the zoom magnification of the second optical system of the imaging unit 22 is changed from “1 ×” to “2 ×” and “east” is specified in SA4, the zoom magnification of the third optical system of the imaging unit 22 is set to “1 ×”. When “North” is specified in SA4, the zoom magnification of the fourth optical system of the imaging unit 22 is changed from “1 ×” to “2 ×”.

  Next, in SA6, the control unit 24 of the imaging device 20 causes all the light projecting devices 10 to project light in the same manner as in SA1.

  Next, in SA7, the imaging control unit 241 of the imaging device 20 images the monitoring area 900. Specifically, the first output shown in FIG. 3 using the imaging unit 22 in FIG. 2 at the timing corresponding to the timing at which SA6 is executed, as in SA2, so that the light output at SA6 can be imaged. The area 901 to the fourth area 904 are imaged at the zoom magnification set at the present time, and image data of the imaging result is acquired. Here, for example, when only the zoom magnification of the first optical system of the imaging unit 22 is changed from “1 ×” to “2 ×” in SA5, the first zoom of the imaging unit 22 in FIG. Since the magnification is set to “2 ×” and the zoom magnification of the second to fourth optical systems is set to “1 ×”, the first image captured at “zoom magnification” = “2 ×” is used. First image data that is image data of one area 901, second image data that is image data of the second area 902 captured with “zoom magnification” = “1 ×”, “zoom magnification” = “1 ×” The third image data that is the image data of the third area 903 imaged at, and the fourth image data that is the image data of the fourth area 904 imaged at “zoom magnification” = “1 ×” are acquired. . As described above, the image data corresponding to at least the direction specified in SA4 among the image data is captured by enlarging using the optical system of the imaging unit 22 in FIG. Since the number of pixels for displaying the light from the apparatus 10 increases, it becomes possible to improve the determination accuracy in SA8 of FIG.

  Next, in SA8, the abnormality occurrence determination unit 243 of the imaging device 20 determines the occurrence of a fire in the monitoring area 900. Specifically, it is determined whether or not a fire has occurred based on each image data acquired in SA7. For this determination method, any method can be used, but here, focusing on the light intensity in the direction specified in SA4 (that is, the direction in which a fire may have occurred). The following description will be made assuming that the determination method is used.

  Specifically, for this method, first, image data corresponding to the direction specified in SA4 is specified from among the image data acquired in SA7. Specifically, when “west” is specified in SA4, “first image data” is specified in SA7, and “south” is specified in SA4, “second image data” is specified in SA7, and SA4 When “East” is specified in SA7, “third image data” is specified in SA7, and when “North” is specified in SA4, “Fourth image data” is specified in SA7.

  Next, the maximum light intensity in the specified image data is specified, and the maximum light intensity of the specified image data is acquired as the received light intensity of light from the corresponding light projecting device 10. Specifically, when the image data specified in the immediately preceding process is the first image data, in this process, the maximum light intensity of the specified first image data is specified, and then the specified result is projected. When the image data acquired as the light reception intensity of the light from the apparatus 10A and specified in the immediately preceding process is the second image data, in this process, the maximum light intensity of the specified second image data is specified. When the specified result is acquired as the received light intensity of light from the light projecting device 10B and the image data specified in the immediately preceding process is the third image data, the maximum of the specified third image data is determined in this process. When the light intensity is specified, the specified result is acquired as the received light intensity of the light from the light projecting device 10C, and the image data specified in the immediately preceding process is the fourth image data. In this process, on the identified maximum light intensity of the fourth image data obtained by the specified, it acquires the identification result as a received light intensity of the light from the light projecting unit 10D.

  Next, the determination threshold value specified by the determination threshold value specification information stored in the storage unit 23 of FIG. 2 is acquired. Next, the acquired light reception intensity (that is, the light reception intensity of light from the light projection apparatus 10A, the light reception intensity of light from the light projection apparatus 10B, the light reception intensity of light from the light projection apparatus 10C, or the light reception intensity from the light projection apparatus 10D) The received light intensity) is compared with the obtained determination threshold. Next, based on the comparison result, it is determined whether or not a fire has occurred. Specifically, when the received light intensity is less than the determination threshold, it is determined that the intensity of light from the light projecting device 10 is reduced due to light scattering by interference such as smoke, and a fire occurs. On the other hand, if the acquired received light intensity is greater than or equal to the determination threshold, it is determined that light is not scattered by interference such as smoke, and it is determined that no fire has occurred.

  When it is determined in SA8 of FIG. 4 that this fire is not generated using this determination method (NO in SA8), the process proceeds to SA12 and it is determined that a fire is occurring (YES in SA8). To SA9.

  Next, in SA9, the notification unit 244 of the imaging device 20 notifies the occurrence of a fire. As this notification method, any method can be used. Here, the following method will be described assuming that the following method is used. Specifically, the image data acquired in SA2 and SA7, data indicating the direction specified in SA4 (hereinafter referred to as fire direction data), and a notification signal including the ID of the imaging device 20 are transmitted via the communication unit 21. Then, it is transmitted to a receiver (not shown) or a notification lamp (not shown) provided in the imaging device 20 is turned on to notify the occurrence of a fire. On the other hand, the receiver that has received the notification signal identifies a monitoring area (in this case, the monitoring area 900 in FIG. 1) where a fire has occurred based on the ID included in the received notification signal. Based on the fire direction data included in the received notification signal, the direction in which the fire is occurring (for example, the direction of the fire location with respect to the imaging device 20 in FIG. 1B) is specified, and the received notification signal described above. The occurrence of fire is notified by displaying the image data included in the image and the specific results thereof on a display means such as a display or transmitting the result to the outside.

  Next, in SA10, the control unit 24 of the imaging device 20 determines whether to recover. Specifically, it is determined whether or not a recovery signal transmitted from a receiver (not shown) for recovery is received via the communication unit 21. If the user does not perform a recovery operation on the receiver (for example, presses a predetermined recovery button) and does not receive a recovery signal, it is determined that the user does not recover (NO in SA10) and receives the recovery signal. Until the process of SA10 is repeated. Further, when a recovery operation is performed on the receiver by the user and a recovery signal is received, it is determined to be recovered (YES in SA10), and the process proceeds to SA11.

  Next, in SA11, the control unit 24 of the imaging device 20 stops the alarm process after stopping the notification about the occurrence of the fire. Specifically, the notification about the occurrence of a fire is stopped by turning off an unillustrated notification lamp provided in the imaging device 20.

  If it is determined in SA8 that no fire has occurred (NO in SA8), the imaging control unit 241 of the imaging device 20 returns the magnification of the imaging unit 22 to the original magnification in SA12, and then returns to SA1. Transition. Specifically, the zoom magnifications of the first to fourth optical systems of the imaging unit 22 are all set to “1 ×”.

(Effect of embodiment)
According to such an alarm system 100 of the present embodiment, light is projected onto the imaging unit 22 from a plurality of light projecting directions in the monitoring area 900, and a plurality of image capturing directions corresponding to the plurality of light projecting directions are imaged. Since the imaging unit 22 is controlled as described above, for example, smoke can be detected in a plurality of directions, and the direction of the fire location can be specified based on the direction in which the smoke is detected.

  In addition, according to the alarm system 100, the imaging unit 22 is controlled so as to magnify and capture at least a part of the plurality of imaging directions. For example, smoke detection accuracy is increased in some directions. It is possible to improve the accuracy of detecting the occurrence of a fire.

  In addition, according to the alarm system 100, the imaging result of the imaging unit 22 is output. For example, the state of the monitoring area 900 can be monitored based on the imaging result, and the direction of the fire location can be specified. It becomes possible.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention may be arbitrarily modified and improved within the scope of the technical idea of the present invention described in the claims. Can do. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above contents, and may vary depending on the implementation environment and details of the configuration of the invention. May be solved, or only some of the effects described above may be achieved. For example, even if the disaster prevention performance cannot be improved as compared with the conventional system, the disaster prevention performance equivalent to that of the conventional system can be achieved by the system of the present invention different from the conventional apparatus. The problem has been solved.

(About distribution and integration)
Further, each of the electrical components described above is functionally conceptual and does not necessarily need to be physically configured as illustrated. In other words, the specific forms of distribution and integration of each unit are not limited to those shown in the drawings, and all or a part thereof may be functionally or physically distributed or integrated in arbitrary units according to various loads or usage conditions. Can be configured. For example, the functions of the light projecting device 10 and the imaging device 20 may be configured by being distributed among a plurality of devices, or the devices may be integrated. Specifically, at least a part or all of each unit of the control unit 24 in the imaging device 20 is provided in a receiver (not shown), and the receiver communicates with the light projecting device 10 or the imaging device 20. By performing the above, an alarm process may be executed. For example, some of the functions of the light projecting device 10 and the imaging device 20 may be omitted. Specifically, the abnormal direction determination unit 242 of the imaging device 20 may be omitted, only the occurrence of a fire may be determined, and the determination result may be notified.

(About shape, numerical value, structure, time series)
In addition, regarding the constituent elements exemplified in the embodiment and the drawings, the shape, numerical value, or the structure of a plurality of constituent elements or the mutual relationship in time series are arbitrarily modified and improved within the scope of the technical idea of the present invention. can do.

(About projector)
In the embodiment, as shown in FIG. 1B, the case where the four light projecting devices 10 </ b> A to 10 </ b> D are installed in directions corresponding to the four directions with the imaging device 20 as a reference has been described. Not limited to this. For example, one each in a direction corresponding to eight directions with respect to the imaging device 20, that is, a total of eight projectors 10 may be installed, or only one projector 10 may be installed. Then, two, three, five to seven, or nine or more light projecting devices 10 may be installed. In this case, alarm processing may be performed in the same manner as in the embodiment based on the received light intensity of the light from the installed projector 10.

  In the embodiment, as shown in FIG. 1B, the case where the four light projecting devices 10A to 10D are installed and fixed at predetermined positions in the monitoring area 900 has been described. I can't. For example, a moving rail that moves the light projecting device 10 to the west, south, east, or north side of the imaging device 20 with respect to the imaging device 20, and a moving device that moves the light projecting device 10 along the moving rail. By providing and moving only one light projecting device 10, light may be projected from each light projecting direction in the embodiment (that is, the west side, the south side, the east side, or the north side of the imaging device 20). . The number of projectors 10 to be moved is not limited to one, and may be two or more.

  In the embodiment, the case where pulse light is output only once from the light projecting device 10 in SA1 and SA6 in FIG. 4 is described, but the present invention is not limited to this. For example, SA1 and SA6 in FIG. 4 may be omitted, and the light projecting device 10 may continue to project light (that is, continue to output light) while the alarm process is being performed. In this case, in SA2 and SA7, the light from the light projecting device 10 can be reliably imaged, and the determination accuracy of fire occurrence can be improved.

(About imaging devices)
In the embodiment, a case has been described in which the imaging unit 22 is configured using four sets of “image sensor” and “optical system” in order to capture each of the four divided areas of the monitoring area 900. It is not limited to this. For example, in order to image each of the areas obtained by dividing the monitoring area 900 into two, three, or five or more, the imaging unit 22 using two, three, or five or more “image sensors” and “optical systems”. May be configured. Further, for example, the imaging unit 22 may be configured using only one image sensor and only one optical system including an optical device such as a fisheye lens that can capture the entire area of the monitoring area 900. . Further, for example, an optical device having an angle of view that can capture only a part of the monitoring region 900 and an adjustment device that adjusts the orientation of the optical device to adjust the imaging direction of the optical device are used. The imaging unit 22 may be configured, and the imaging control unit 241 may control the adjustment device to adjust the orientation of the optical device, thereby imaging a plurality of imaging directions.

(About expansion)
In the embodiment, the case has been described in which the zoom magnification of the imaging unit 22 in FIG. 2 can be set to “1 ×” or “2 ×” stepwise, but is not limited thereto. For example, it may be possible to arbitrarily set three or more stages instead of only “1 ×” or “2 ×”, or to set the magnification continuously. "Can only be set to""(that is, it may not be enlarged).

  In the embodiment, the case where the direction specified in SA4 in FIG. 4 is enlarged in SA5 has been described, but the present invention is not limited to this. For example, the direction to be enlarged may be determined in advance, and the determined direction may be enlarged, or the enlargement direction input corresponding to the enlargement direction input from the user to a receiver (not shown). You may make it expand a direction.

(About each process)
In the embodiment, some of the steps in FIG. 4 may be omitted or changed. For example, SA4 to SA8 and SA12 of SA1 to SA12 (that is, each process for determining by changing the magnification) may be omitted. In this case, since it is possible to notify the occurrence of a fire only by the determination of SA3, it becomes possible to quickly notify the occurrence of a fire. Further, for example, in SA6, only the light projecting device 10 corresponding to the direction enlarged in SA5 may be projected. In this case, it is possible to omit light projection from the light projecting device 10 that is unnecessary for fire determination, and it is possible to reduce power consumption of the alarm system 100.

(About judgment)
Further, in the embodiment, in the determination of SA3 and SA8 in FIG. 4, it is determined whether or not a fire has occurred (or the possibility that a fire has occurred) based on the comparison result between the received light intensity and the determination threshold value. Although explained, it is not limited to this. For example, the light projecting device 10 projects light a predetermined number of times (for example, two or more times), and each time the light projecting device 10 projects light, the image capturing device 20 captures an image of the monitoring area 900, so Image data, obtaining a temporal change amount of the received light intensity in the image data based on the obtained image data, comparing the obtained change amount with a reference change amount described later, and in the comparison result The occurrence of a fire may be determined based on this. Here, the “reference change amount” is an amount as a threshold value used in the determination regarding the fire, and is an amount set in advance based on the amount of light scattered by the smoke of the simulated fire in the fire test. Specifically, if the obtained change amount is less than the reference change amount, it is determined that light is not scattered by interference such as smoke, and no fire has occurred. If the obtained change amount is equal to or greater than the reference change amount, it is determined that the intensity of light from the light projecting device 10 is reduced due to light scattering by interference such as smoke, and a fire occurs. It is determined that

(About image data)
In the embodiment, every time image data is acquired in SA2 or SA7 in FIG. 4, the image data is transmitted to a receiver (not shown), and the receiver that receives the transmitted image data is Each time image data is received, the image of the image data may be displayed on the display device. In this case, the state of the monitoring area 900 can be monitored based on the image displayed on the display device.

(About communication)
In the embodiment, the case where the light projecting device 10 and the imaging device 20 perform wireless communication has been described. However, the present invention is not limited to this. For example, the light projecting device 10 and the imaging device 20 may be connected to each other via a communication line, and these devices may perform wired communication.
(Appendix)

  The alarm system according to appendix 1 includes an imaging unit that images a monitoring area, a light projecting unit that projects light onto the imaging unit from a plurality of light projecting directions in the monitoring area, and a plurality of light projecting directions in the monitoring area. Imaging control means for controlling the imaging means so as to image a plurality of imaging directions corresponding to the above, an abnormality occurrence determination means for determining occurrence of an abnormality in the monitoring area based on an imaging result of the imaging means, Informing means for informing the occurrence of abnormality in the monitoring area based on the determination result of the abnormality occurrence determining means.

  The alarm system according to appendix 2 includes an abnormal direction determination unit that determines a direction in which an abnormality may occur in the monitoring area in the alarm system according to appendix 1, and the imaging control unit Based on the determination result of the direction determining means, the imaging means is controlled so as to enlarge and image at least a part of the plurality of imaging directions.

  The alarm system according to appendix 3 is the alarm system according to appendix 1 or 2, further including an imaging result output unit that outputs an imaging result of the imaging unit.

(Additional effects)
According to the alarm system described in appendix 1, the imaging unit is controlled so as to project the imaging unit from a plurality of light projecting directions in the monitoring region and capture a plurality of imaging directions corresponding to the plurality of projection directions. Therefore, for example, smoke can be detected in a plurality of directions, and the direction of the fire location can be specified based on the direction in which the smoke is detected.

  According to the alarm system described in Supplementary Note 2, the imaging unit is controlled so as to magnify and capture at least a part of a plurality of imaging directions. For example, smoke detection accuracy in some directions It is possible to improve the detection accuracy of fire occurrence.

  According to the alarm system described in Supplementary Note 3, since the imaging result of the imaging unit is output, for example, the state of the monitoring area can be monitored based on the imaging result, and the direction of the fire location can be specified. It becomes possible.

DESCRIPTION OF SYMBOLS 10 Floodlight apparatus 10A Floodlight apparatus 10B Floodlight apparatus 10C Floodlight apparatus 10D Floodlight apparatus 11 Communication part 12 Floodlight part 13 Memory | storage part 14 Control part 20 Imaging device 21 Communication part 22 Imaging part 23 Storage part 24 Control part 100 Alarm System 241 Imaging control unit 242 Abnormal direction determination unit 243 Abnormality generation determination unit 244 Notification unit 900 Monitoring region 901 First region 902 Second region 903 Third region 904 Fourth region A Interior angle B Interior angle C Interior angle D Interior angle W1 Wall W2 Wall W3 Wall W4 wall

Claims (3)

Imaging means for imaging the monitoring area;
A light projecting unit that projects the image capturing unit from a plurality of light projecting directions in the monitoring region;
Imaging control means for controlling the imaging means so as to image a plurality of imaging directions corresponding to the plurality of light projecting directions in the monitoring area;
An abnormality occurrence determination means for determining the occurrence of an abnormality in the monitoring region based on an imaging result of the imaging means;
Based on the determination result of the abnormality occurrence determination means, notification means for notifying the occurrence of abnormality in the monitoring area;
With alarm system. An abnormal direction determination means for determining a direction in which an abnormality may occur in the monitoring area,
The imaging control means controls the imaging means so as to enlarge and image at least a part of the plurality of imaging directions based on the determination result of the abnormal direction determination means.
The alarm system according to claim 1. Imaging result output means for outputting the imaging result of the imaging means,
The alarm system according to claim 1 or 2.

Images