JP2004219107A - Inundation detector and inundation detection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inundation detector for detecting an inundation state automatically and accurately. <P>SOLUTION: Near infrared rays are projected to an inundation detection region by a light source 2, the reflection light of the projected near infrared rays is received and photographed by a photographing camera 3, and an inundation state in the inundation detection region is detected, based on the photographing image, thus directly and automatically detecting the inundation state of the inundation detection region. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inundation detection device and an inundation detection method for detecting an inundation state of a riverbed or the like.
[0002]
[Prior art]
Conventionally, as a method of detecting the inundation state of a riverbed or the like, for example, a method of predicting the inundation state of a floodbed based on a measurement value of a water level gauge installed in the river or a method of capturing an image taken by a camera installed in the river. Methods such as monitoring and detecting inundation were employed.
[0003]
[Problems to be solved by the invention]
However, in the method of estimating the inundation state based on the measurement value of the water level gauge, the inundation state cannot be directly detected, and therefore, the inundation state cannot be accurately grasped. Further, in the method of monitoring the image of the photographing camera, the monitoring burden on the observer is large, and it is not possible to automatically detect inundation.
[0004]
The present invention has been made to solve such a problem, and an object of the present invention is to provide a flood detection device and a flood detection method capable of automatically and accurately detecting a flood condition.
[0005]
[Means for Solving the Problems]
In order to achieve such an object, a flood detection device according to the present invention includes a floodlight unit that projects near-infrared light to a flood detection area where flooding should be detected, and a flooded near-infrared light beam. The apparatus is provided with light receiving means for receiving the reflected light in the flood detection area, and detection means for detecting the state of flooding in the flood detection area based on the output of the light receiving means.
[0006]
According to the present invention, it is possible to directly and automatically detect the inundation state of the inundation detection area by receiving the reflected light reflected in the inundation detection area and detecting the inundation state based on the received light output. In addition, by projecting near-infrared light to the waterlogging detection area, waterlogging detection becomes possible without irradiating or emitting visible light. For this reason, even in a place where irradiation or emission of visible light is not preferable or where such irradiation is prohibited, inundation detection can be performed.
[0007]
Further, the waterlogging detection device according to the present invention includes a waterlogging detection plate which is provided at a near-infrared light irradiation position and has a surface subjected to reflection reduction processing, wherein the light receiving unit receives reflected light reflected by the waterlogging detection plate. Features.
[0008]
According to this invention, the reflection amount of the near-infrared light when there is no water in the water detection area can be reduced by performing the reflection reduction processing on the surface of the water detection plate. For this reason, the difference in the amount of reflection of near-infrared light between when there is water and when there is no water can be increased, and the detection accuracy of water can be improved.
[0009]
Further, the inundation detection device according to the present invention includes a depth detection plate that is installed at a position irradiated with near-infrared light at an angle to the horizontal, and a light receiving unit is a photographing camera that photographs the depth detection plate. The present invention is characterized in that a depth of inundation in an inundation detection area is detected based on an image captured by a camera.
[0010]
According to the present invention, the depth detection plate is installed in the inundation detection area, and the depth detection plate is photographed by the photographing camera, thereby directly and automatically detecting the inundation depth in the inundation detection area based on the photographed image. can do. In the waterlogging detection device according to the present invention, it is preferable that the surface of the depth detection plate is subjected to reflection reduction processing.
[0011]
Further, in the waterlogging detection device according to the present invention, it is preferable that the light projecting means and the light receiving means are attached to the same column member.
[0012]
Further, the immersion detecting device according to the present invention is characterized in that the immersion detecting device is provided with a cover for preventing external light from entering an irradiation area of near-infrared light projected from the light projecting means.
[0013]
ADVANTAGE OF THE INVENTION According to this invention, the external light which injects into an inundation detection area | region can be restricted, it can prevent that an inundation detection result is influenced by the change of surrounding environment, and the reliability of an inundation detection result can be improved. .
[0014]
The flood detection method according to the present invention further includes a floodlight step of projecting near-infrared light to a flood detection area where flooding is to be detected, and a reflection of the projected near-infrared light in the flood detection area. The method includes a light receiving step of receiving light with the light receiving means, and a detecting step of detecting a flooded state in the flooded detection area based on an output of the light receiving means.
[0015]
According to the present invention, it is possible to directly and automatically detect the inundation state of the inundation detection area by receiving the reflected light reflected in the inundation detection area and detecting the inundation state based on the received light output. In addition, by projecting near-infrared light to the waterlogging detection area, waterlogging detection becomes possible without irradiating or emitting visible light. For this reason, even in a place where irradiation or emission of visible light is not preferable or where such irradiation is prohibited, inundation detection can be performed.
[0016]
In this waterlogging detection method, it is preferable to install a waterlogging detection plate whose surface has been subjected to reflection reduction processing at the irradiation position of near-infrared light, and to receive light reflected by the waterlogging detection plate by a light receiving unit.
[0017]
In addition, in the method for detecting inundation according to the present invention, a depth detection plate that is inclined with respect to the horizontal is installed at the irradiation position of near-infrared light, and the depth detection plate is received and photographed by a photographing camera in a light receiving step, and the detection step And detecting the depth of inundation in the inundation detection area based on an image captured by the imaging camera.
[0018]
According to the present invention, the depth detection plate is installed in the inundation detection area, and the depth detection plate is photographed by the photographing camera, thereby directly and automatically detecting the inundation depth in the inundation detection area based on the photographed image. can do.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each of the drawings, the same elements are denoted by the same reference numerals, and redundant description will be omitted. Also, the dimensional ratios in the drawings do not always match those described.
[0020]
FIG. 1 shows a schematic configuration diagram of a water intrusion detection device according to the present embodiment.
[0021]
As shown in FIG. 1, an inundation detection device 1 is a device that detects inundation, and is installed on a riverbed, a floodbed, and the like, for example. The flood detection device 1 includes a light projector 2 that emits near-infrared light. The light projector 2 is a light projecting unit that projects and irradiates near-infrared light to an inundation detection area where water is to be detected. For example, a device that emits near-infrared light using an LED as a light source is used. Further, it is preferable to use a pulse light that emits near-infrared light intermittently. In this case, power consumption can be reduced. Here, the near-infrared light means light having a wavelength of 780 to 1500 nm.
[0022]
Further, the immersion detecting device 1 includes a photographing camera 3. The imaging camera 3 functions as a light receiving unit that receives the reflected light of the near-infrared light emitted by the light projector 2 in the inundation detection area and shoots the image. For example, a CCTV (Closed Circuit Television) camera is used. As the photographing camera 3, it is preferable to use a camera having high light-receiving sensitivity in the near-infrared light wavelength region.
[0023]
It is preferable that the photographing camera 3 and the projector 2 be installed on the same support 4. For example, the photographing camera 3 and the projector 2 are attached to the upper part of the support 4. Then, the photographing direction of the photographing camera 3 and the light projecting direction of the light projector 2 are directed to the flood detection area. By installing the photographing camera 3 and the floodlight 2 on the same column 4, it is possible to prevent the installation of a plurality of columns from impairing the beauty of the river.
[0024]
The projector 2 and the photographing camera 3 are connected to a controller 5. The controller 5 controls the operation of the projector 2 and the photographing camera 3. Further, the controller 5 functions as detecting means for detecting a flooded state in the flooded detection area based on the output image of the photographing camera 3. In addition, it functions as a detection unit that detects the depth of inundation in the inundation detection area based on the output image of the photographing camera 3.
[0025]
In the inundation detection area of the inundation detection device 1, an inundation detection plate 6 and a depth detection plate 7 are provided. The immersion detection plate 6 is a plate for facilitating detection of a immersion state, and has a surface subjected to reflection reduction processing so that a difference in the amount of light reflection between an immersion portion and a non-immersion portion is obtained. For example, the surface of the immersion detecting plate 6 is processed into a coarse shape having a predetermined roughness or more. By this reflection reduction processing, even when near-infrared light of the light projector 2 is irradiated during non-water immersion, the amount of light reflection is reduced due to irregular reflection.
[0026]
It is desirable that the immersion detecting plate 6 be installed at a predetermined angle from horizontal. For example, the inclination angle θ6 of the immersion detecting plate 6 is set to be inclined at 5 to 20 degrees from the horizontal. As shown in FIG. 2, when there is no water intrusion, the near infrared light L from the projector 2 is irregularly reflected on the surface of the water intrusion detection plate 6 and the amount of reflection is small. As shown in FIG. 3, when the water is slightly flooded, the near-infrared light L is reflected on the water film or the water droplet on the water immersion detecting plate 6 and the reflection amount is slightly large. As shown in FIG. 4, when there is a lot of flooding, the flooded water surface W comes on the flooding detection plate 6, so that the reflection angle is different from that in the case of FIG.
[0027]
As shown in FIG. 1, a depth detecting plate 7 is a plate body for facilitating detection of the depth of flooding. The surface of the plate is subjected to reflection reduction processing, and a difference in light reflection amount between a flooded portion and a non-flooded portion is obtained. It has become.
[0028]
The depth detection plate 7 is installed at a predetermined angle from horizontal. For example, it is preferable that the inclination angle θ7 of the depth detection plate 7 is set to be inclined by 30 to 70 degrees from horizontal.
[0029]
Next, the operation of the flood detection device according to the present embodiment and the flood detection method according to the present embodiment will be described.
[0030]
In FIG. 1, near-infrared light is projected by the light projector 2, and the near-infrared light is applied to the inundation detection plate 6 and the depth detection plate 7 installed in the inundation detection area. The light projection of the light projector 2 is performed based on a control signal output from the controller 5, and is performed intermittently so as to be pulsed light.
[0031]
Then, the photographing camera 3 is operated to photograph the immersion detecting plate 6 and the depth detecting plate 7 to which the near-infrared light is irradiated. When there is no inundation in the inundation detection area, as shown in FIG. 5, the inundation detection plate 6 and the depth detection plate 7 are projected on the image captured by the imaging camera 3. At this time, since there is no water droplet or water surface on the surface of the immersion detecting plate 6, near-infrared light is only irregularly reflected on the surface, and the amount of reflected near-infrared light is very small.
[0032]
Then, when there is a little water in the water detection area, a part of the surface of the water detection plate 6 is wet as shown in FIG. 6 (reference numeral 61 in FIG. 6). For this reason, near-infrared light is specularly reflected at the wet portion 61, and the amount of the near-infrared light received by the photographing camera 2 increases. However, as shown in FIG. 3, the reflected light is reflected on the surface of the immersion detecting plate 6 and the reflected light is deflected in the direction of the photographing camera 2, so that the amount of received light is not so large.
[0033]
When the amount of flooding further increases, a water surface W comes on the flooding detection plate 6 as shown in FIG. For this reason, near-infrared light is specularly reflected on the water surface W, and the amount of near-infrared light received by the photographing camera 2 increases. At that time, as shown in FIG. 4, the near-infrared light is reflected not on the inclined surface of the inundation detection plate 6 but on the horizontal water surface W, so that the reflection direction of the reflected light becomes closer to the photographing camera 2. , The amount of received light increases.
[0034]
As described above, the amount of light that the photographing camera 3 receives the reflected light changes depending on the degree of flooding. Therefore, by detecting the amount of received near-infrared light based on the image captured by the imaging camera 3, the state of inundation in the inundation detection area can be detected.
[0035]
By the way, when the amount of inundation further increases from the inundation state of FIG. 7, the water surface W of the inundation rises on the depth detection plate 7 as shown in FIG. At this time, as the depth of inundation increases, the position of the water surface W moves above the depth detection plate 7 (see the arrow in FIG. 8). Therefore, by measuring the position of the water surface W on the depth detection plate 7, the depth of the inundation can be detected.
[0036]
The detection of the depth of the inundation is performed by performing image processing on an image captured by the imaging camera 3 and calculating the position of the water surface W on the depth detection plate 7. For example, the captured image is subjected to edge processing, the position of the water surface W on the depth detection plate 7 is detected, and the position is calculated. This makes it possible to detect the depth of flooding based on the image captured by the camera 3.
[0037]
As described above, according to the inundation detection device and the inundation detection method according to the present embodiment, the inundation detection area is detected by receiving the reflected light reflected by the inundation detection area and detecting the inundation state based on the received light output. Can be detected directly and automatically. Further, by projecting the near-infrared light L to the waterlogging detection area, waterlogging can be detected without irradiating or emitting visible light. For this reason, even in a place where irradiation or emission of visible light is not preferable or where such irradiation is prohibited, inundation detection can be performed.
[0038]
In addition, by installing the flood detection plate 6 whose surface has been subjected to reflection reduction processing at the irradiation position of the near infrared light L projected from the floodlight 2, the reflection amount of the near infrared light when there is no flood in the flood detection area. Can be reduced. For this reason, the difference in the amount of reflection of near-infrared light between when there is water and when there is no water can be increased, and the detection accuracy of water can be improved.
[0039]
Further, by installing the depth detection plate 7 in the inundation detection area and photographing the depth detection plate 7 with the photographing camera 3, it is possible to automatically automatically detect the inundation depth in the inundation detection area based on the photographed image. it can.
[0040]
In the present embodiment, a cover that covers the irradiation area of the near-infrared light L is not provided, but it is preferable to provide a cover that prevents external light from entering the irradiation area. For example, as shown in FIG. 9, a cover 8 is provided so as to cover the immersion detecting plate 6 and the depth detecting plate 7 to prevent external light such as sunlight from entering. This makes it possible to limit the light incident on the inundation detection area, prevent the inundation detection result from being affected by a change in the surrounding environment, and improve the reliability of the inundation detection result.
[0041]
In the present embodiment, the external information is not input and the external information is reflected in the inundation detection result. However, the reliability of the inundation detection result may be improved by using the external information. For example, as shown in FIG. 10, information on river water level data is input as external information, and the water level data is reflected in the inundation detection result. Specifically, when the water level of the river is equal to or higher than a predetermined value and it is determined that the river is flooded based on the photographing data of the photographing camera 3, it is determined that the river is flooded. On the other hand, when the water level of the river is not equal to or more than the predetermined value and it is determined that there is water intrusion based on the photographing data of the photographing camera 3, it is determined that the water is flooded by rainwater. By reflecting the water level data in the inundation detection result in this way, the cause of inundation can be specified and determined.
[0042]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a waterlogging detection device capable of automatically and accurately detecting a waterlogged state.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a water intrusion detection device according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a reflection state of near-infrared light at the time of flooding in the flood detection device of FIG.
FIG. 3 is an explanatory diagram of a reflection state of near-infrared light at the time of flooding in the flood detection device of FIG. 1;
FIG. 4 is an explanatory diagram of a reflection state of near-infrared light at the time of flooding in the flood detection device of FIG. 1;
FIG. 5 is an explanatory diagram of a photographed image when the water intrusion detection device of FIG. 1 is operated.
FIG. 6 is an explanatory diagram of a captured image when the water intrusion detection device of FIG. 1 operates.
FIG. 7 is an explanatory diagram of a captured image when the inundation detection device of FIG. 1 is operated.
FIG. 8 is an explanatory diagram of a photographed image when the inundation detection device of FIG. 1 is operated.
FIG. 9 is an explanatory diagram of a modified example of the water intrusion detection device according to the present embodiment.
FIG. 10 is an explanatory diagram of a modified example of the water intrusion detection device according to the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Inundation detection apparatus, 2 ... Light projector (light emitting means), 3 ... Surveillance camera (light receiving means), 4 ... Post, 5 ... Controller (detection means), 6 ... Inundation detection board, 7 ... Depth detection board, L ... Near infrared light.

Claims (8)

Light emitting means for emitting near-infrared light to an inundation detection area to detect inundation,
Light receiving means for receiving the reflected light of the projected near-infrared light in the immersion detection area,
Detecting means for detecting a flood condition in the flood detection area based on an output of the light receiving means,
Immersion detection device equipped with A flood detection plate is provided at the irradiation position of the near-infrared light and has a surface whose reflection is reduced.
The light receiving unit receives the reflected light reflected by the immersion detection plate,
The inundation detection device according to claim 1, wherein: A depth detection plate that is installed at an irradiation position of the near-infrared light and is inclined with respect to the horizontal,
The light receiving means is a photographing camera for photographing the depth detection plate,
The detecting means detects a depth of inundation in the inundation detection area based on an image captured by the imaging camera,
The inundation detection device according to claim 1, wherein: The inundation detection device according to claim 3, wherein the surface of the depth detection plate is subjected to reflection reduction processing. The flood detector according to any one of claims 1 to 4, wherein the light projecting means and the light receiving means are mounted on the same column member. The inundation detection device according to any one of claims 1 to 5, further comprising a cover for preventing external light from being incident on an irradiation area of near-infrared light emitted from the light emitting means. A floodlight step of projecting near-infrared light to a flood detection area where flooding should be detected,
A light receiving step of receiving reflected light of the projected near-infrared light in the water intrusion detection region by light receiving means,
A detection step of detecting a waterlogging state in the waterlogging detection area based on an output of the light receiving unit;
Infiltration detection method provided with. Install a depth detection plate inclined to the horizontal at the irradiation position of the near infrared light,
In the light receiving step, the depth detection plate is photographed with a photographing camera,
In the detecting step, detecting a depth of inundation in the inundation detection area based on a captured image of the imaging camera,
The method of detecting inundation according to claim 7, wherein:

Images