JPH08246434A - Method and equipment for automatically monitoring attack of jellyfish into intake - Google Patents

Abstract

PURPOSE: To surely and continuously detect the attack of a jellyfish and quantity thereof, and to effectively prevent taking-in to an intake by a method wherein a water surface region in the periphery of the intake is captured continuously as a visual picture, a jellyfish component is extracted through picture processing, the quantity of the jellyfish is measured from the processed picture, and an alarm signal is output. CONSTITUTION: A picture is processed by a picture-processing measuring device 7 to a picture signal transmitted by monitor photographing by a TV camera 5. The picture component of a jellyfish floating in water is extracted by a picture processing means or a picture- processing function section, and the quantity of the jellyfish is measured by a measuring means or the picture-processing function section from the picture. Measured data output from the picture-processing measuring device 7 are taken in and analyzed by a jellyfish-attack decision device 8, and an alarm signal is output to at least an alarm device 11 at the time of the quantity of the jellyfish generated larger than a fixed quantity in a monitor area. A raw picture by the TV camera 5, a processed picture by the picture-processing measuring device 7, the quantity of the jellyfish, etc., are displayed on a picture plane by a picture display unit 9. The displayed pictures are recorded by a picture recording device 10 consisting of a time-lapse video, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for continuously monitoring the condition of underwater floating organisms such as moon jellyfish gathering in the sea over the entire intake of a thermal power plant.

[0002]

2. Description of the Related Art In a thermal power plant, a nuclear power plant, etc., an intake port is provided on a quay or the like, from which seawater is taken in at a constant flow rate and used as cooling water for a condenser or the like. . On the other hand, water jellyfish are seasonally generated in the near sea, float on the surface of the water due to the tidal current, and are collected near the intake by the suction force of the intake. If this water jellyfish is taken into the intake port and seawater intake is hindered, it will be difficult to operate the cooling system equipment, and in the worst case, a serious trouble will occur, such as unavoidable stoppage of operation of the power generator. As a measure against this, a curtain wall is extended from the land side with an intake port to form a pool, and a water intake port is formed at the bottom of this curtain wall, while a jellyfish collection net with only the bottom part opened on the open side of the curtain wall. Although it is spread, jellyfish collect under the influence of tidal currents and waves in the seawater and the ecological characteristics of sinking at night, and they collect under the opening of the jellyfish collection net and the water guide port in the pool. Therefore, in the usual case, a jellyfish removing device, for example, a screen equipped with a rotary conveyor is vertically installed on the upstream side of the water intake so as to scrape out the water jellyfish from the water, or bubble ejection is performed outside the curtain wall as a jellyfish removing device. Various methods have been proposed, such as arranging means to forcibly raise the jellyfish or move it to another place. The jellyfish removing device is not normally driven in terms of cost, but is only driven when a large number of jellyfish are collected. However, as a prerequisite, it is important to detect the collection of water jellyfish at the intake. However,
Large numbers of water jellyfish are generated at one time due to water temperature, etc. Moreover, the ecosystem is not well known, and it is difficult to predict when they will occur.

As a method of monitoring this water jellyfish, a television camera is conventionally installed above the curtain wall to photograph and monitor the water surface, but the jellyfish is semi-transparent and has fluctuations and reflections on the water surface. Therefore, it is difficult to visually recognize it, and it is almost impossible to grasp the amount of the generated. Although the use of an underwater television camera has also been considered, it has no practical use because the visibility in water is poor and the transparency around the water intake is low, often about 1 m at most. Therefore, in reality, a patrol boat is put out in the pool or outside the curtain wall, and a watchman is placed on the curtain wall for visual observation throughout the day, but for the reasons described above, it is possible to accurately grasp the jellyfish attack. It was difficult and costly.

Another method is disclosed in Japanese Patent Laid-Open No. 6-290231.
The publication discloses a method of detecting a fish using a fish finder, but it is difficult to distinguish jellyfish because it has the same components as seawater. As a countermeasure against this, in the prior art, the sonar sensitivity is increased by aerating from the water bottom off the intake and blowing the air into the jellyfish umbrella. However, in order to see this method in practice, it is necessary to lay a wide range of nozzle pipes off the water intake, install a large air compressor on the land, and operate continuously. However, the cost for monitoring becomes very high. In addition, jellyfish are not always floating vertically, and it is expected that bubbles due to aeration will not enter the umbrella in many cases, and it is difficult to accurately grasp the amount of jellyfish attack. For this reason, it has not been said to have sufficient practicality.

Another method for detecting jellyfish attack is disclosed in Japanese Patent Laid-Open No. Hei 6
Japanese Patent Laid-Open No. 108447 proposes to detect a jellyfish attack by interposing a load cell on the main rope of the jellyfish prevention net and detecting a change in tensile strength of the main rope due to adhesion of the jellyfish to the jellyfish prevention net. . However, in this prior art, strong wind acts on the main rope,
There is a concern about the accuracy because the jellyfish may be detected when a strong tidal current acts on the wind, or when large floating debris other than jellyfish such as driftwood and drums act as a load on the jellyfish prevention net. There is a problem that it is difficult to accurately grasp the amount of jellyfish.

The present invention was devised to solve the above-mentioned problems, and its purpose is to reliably and accurately continuously detect the infestation and the amount of jellyfish at the water intake port, and to take water. It is an object of the present invention to provide a highly practical jellyfish attack automatic monitoring method and device that can effectively prevent uptake into the mouth.

[0007]

In order to achieve the above-mentioned object, the present invention continuously captures a water surface region of an intake or its surroundings as a visual image, extracts jellyfish components from the image, and then from the processed image. This is a method of measuring the amount of jellyfish and outputting an alarm signal when the amount exceeds a certain amount. Further, the present invention is a television camera installed on land near the intake port for continuously photographing the sea surface of the required area, and an underwater illuminator for lighting the underwater of the camera photographing area when necessary,
Image processing means for extracting a jellyfish component from an image taken by the television camera, means for measuring a jellyfish amount from an output image of the image processing means, and an alarm when the jellyfish amount outputted from the jellyfish component exceeds a predetermined amount The configuration includes a jellyfish attack determination means that outputs a signal. The image processing means and the means for measuring the amount of jellyfish include those configured as an image processing / measuring device having respective functions thereof. As the television camera, a high-sensitivity television camera having good sensitivity in water is suitable, and as the underwater illuminator, for example, a metal halide lamp that emits a large amount of blue or green component light having high transmittance in water is suitable. .

[0008]

According to the present invention, not only the water surface around the intake is photographed by the television camera to visually recognize the jellyfish floating in the water as in the prior art, but also the photographed image is subjected to the image processing to reflect the water surface and wave fluctuations. Diffuse reflection is eliminated or reduced as noise, or further binarization, contour extraction, contour filling, etc. are performed, and the amount of jellyfish is measured on the image based on the processed image obtained here. Can be recognized and quantified, highly reliable alarm information can be obtained, and the jellyfish removing device can be accurately driven only when necessary. The present invention is suitable for jellyfish attack monitoring of water intakes of power plants, but it can be used for jellyfish attack monitoring of water intakes of other factories utilizing seawater. Furthermore, the present invention captures a floating object underwater or near the water surface with a television image, and performs image processing of this image to recognize and quantify a floating object to be monitored,
An alarm can be issued when the amount of suspended solids exceeds a certain amount. Therefore, it is also effective as an automatic driftwood monitoring and warning method and its device in dam lakes. That is, in a dam lake, it is a big problem from the viewpoint of dam management that a large amount of driftwood flows in from surrounding rivers and stays on the water surface or in the water, but if the present invention is applied, the amount of driftwood can be grasped. It can provide an efficient solution for processing.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 6 show an embodiment of a method and apparatus for automatically monitoring jellyfish attack according to the present invention. Reference numeral 1 is a quay wall, and 2 is an intake opening that opens below the water surface W of the quay wall, and is connected to a condenser of the power plant A, a heat exchanger B, and the like via a tunnel-shaped water channel 200. 3 is a curtain wall, which defines a pool 3a that surrounds the sea-side area including the intake 2, and has a water inlet 30 at the bottom. Reference numeral 4 denotes a jellyfish collecting net extended above the water from the bottom of the curtain wall 3 on the open ocean side, and the lower part thereof has an opening which allows free circulation of seawater. Reference numeral 4'denotes a jellyfish removing device which is vertically installed in the pool 3a and includes a conveyor with a scraping plate.

Reference numeral 5 is at least one television camera for capturing as a video an underwater floating organism such as a jellyfish in the intake 2 or a certain area including the intake 2. In this embodiment, on a curtain wall portion facing the intake 2. It is mounted on the gantry 500 installed at. The TV camera 5 is CC
A D-TV camera can also be used, but a high-sensitivity one that can shoot with a small amount of light, generally with a sensitivity (F22) of 1000LUX
In the following, it is preferable that the minimum subject illuminance (F1.4 AGC ON) has a performance of 0.3 LUX or less. The reason is, firstly,
The high-sensitivity TV camera has a dynamic range more than twice that of the CCD TV camera with respect to incident light, so an image equivalent to that of the CCD TV camera can be obtained in the daytime.
Moreover, at night, it is possible to photograph a subject with low illuminance that cannot be captured by a CCD television camera. Secondly, the high-sensitivity TV camera has a blue to green light (wavelength 500 nm) with the highest transmittance in seawater.
(-600 nm), it has several times the viewing distance compared to CCD TV cameras that show high sensitivity from red, which has large attenuation in seawater, to infrared light (wavelength 700 nm or more) This is because even if the illuminator body goes out due to a problem such as a light bulb burnout, it is possible to shoot with the lights of the surrounding external lights.

The television camera may be a color television camera, but a black and white television camera is used because the body color of the jellyfish to be monitored is almost white and semitransparent, and seawater and surrounding colors do not affect the identification of the jellyfish. Can fully respond. The lens of the camera body is preferably a zoom lens having a deflection filter for removing sea surface reflection, and from the viewpoint of reducing sea surface reflection, the camera position of the TV camera 5 is set in a state in which the sun is set in the back light so as to be in the normal light. Further, the lens angle is preferably 30 to 40 ° with respect to the reflecting surface so that the deflection filter works effectively. TV camera 5
Is connected to the control device 5a arranged in the operation room a of the plant A via a relay device. The control device 5a includes an on / off circuit of a camera power supply, a video input / output circuit, a lens control circuit, and an on / off circuit of an underwater illuminator described later, and is operated by a remote operation device 5b arranged in the operation room a. It is like this.

Reference numeral 6 denotes an underwater illuminator as an auxiliary light, which is used to illuminate jellyfish and underwater floating organisms in the photographing area of the television camera 5 so as to improve the visual recognition accuracy in cloudy weather or at night. . A general-purpose halogen lamp can be used as the main body 6a of the underwater illuminator 6, but preferably a metal halide light is used because it can generate a large amount of light in the blue to green wavelength band with high underwater transmittance. use. Especially when combining this metal halide light with the high-sensitivity TV camera,
Since the green light of the metal halide light is compatible with the spectral sensitivity characteristic of the high-sensitivity television camera, it is possible to obtain an irradiation photographing range that is twice or more that of a halogen light of the same wattage.

The results of actual visual recognition experiments are shown below. A high-sensitivity black-and-white TV camera (trade name: Harpicon high-sensitivity black-and-white TV camera, manufactured by Hitachi, Ltd.) was used as a television camera, and a 1 kw underwater metal halide light was used as an underwater illuminator. The camera is a single tube type, the minimum imaging surface illuminance is about 0.015 LUX (F1.4 AGC ON), the horizontal resolution is 700 TV or more, the S / N ratio is 57 dB or more, and the lens is a 10 × zoom lens with a deflection filter f = 10 mm-100 mm. It was the specification of. The camera was installed on the frame of the curtain ool section in front of the water inlet, and the lens was set at 35 ° with respect to the water surface. The underwater metal halide light was placed about 1.5 m below the sea level by an arm. The experimental seawater has a transparency of 1-2 m in the water and a tide height of -18 cm-2.
It was 01 cm. The experiment was conducted continuously for 24 hours. For comparison, the minimum subject illuminance is 0.3 Lux (F1.2), the horizontal resolution is 570 TV or more, the S / N ratio is 50 dB or more, and the lens is a CCD single-panel monochrome TV camera (comparative camera) with a 10x zoom lens with a deflection filter. It was installed under the conditions. As for the visibility during the daytime, the image of a jellyfish floating about 30 cm below the surface of the water could be monitored, but the high-sensitivity black and white television camera captured the jellyfish under the surface more clearly than the comparative camera.
Under night lighting conditions, underwater lighting is not turned on,
The comparative camera could not see the jellyfish above and below the surface due to lack of sensitivity, but the high-sensitivity black and white television camera could see the jellyfish on the surface with only the lighting near the scene. When the underwater illuminator was turned on, the high-sensitivity black-and-white television camera was able to see a wide range of jellyfish floating from the water surface to a depth of about 2 m. On the other hand, the comparative camera could be visually recognized due to the characteristics of the underwater illuminator, but the visible range was narrow.

The body 6a of the underwater illuminator 6 may be fixed to the underwater wall surface by an anchor or the like, but in this embodiment, it is supported by the wall of the curtain wall 3 so as to be tiltable within the water surface. Specifically, as shown in FIGS. 3 and 4, the lower end of an arm 6b is connected to the casing of the underwater illuminator body 6a, and the arm 6b extends parallel to the front wall surface of the curtain wall 3 to the atmosphere. Extend and mount 500
Is connected to the tip of a support shaft 6c rotatably supported by a bearing at the lower part of the. Further, a bent portion is provided above the arm 6b, and the counterweight 6 is provided there.
d is attached. A winch 6e such as a manual type is installed on the side of the gantry 500, and a wire 60 guided from the winch 6e is connected to the vicinity of the upper end of the arm 6b via a guide roller 61 on the gantry side. . Therefore, in a normal state, the arm 6b is held vertically as shown in FIGS. 3 and 4, and the underwater illuminator body 6a is oriented forward at a required angle in the sea. Winch 6e when needed
Is operated, the fixing force by the wire 60 is released, so that the weight of the counterweight 6d causes the arm 6b to tilt about the support shaft 6c as a fulcrum, and the underwater illuminator main body 6a moves to the curtain as shown by the phantom line in FIG. Exposed to the atmosphere in front of the wall. Therefore, it is easy to inspect the underwater illuminator body 6a, replace the bulb burned out bulb, or adjust the attachment angle (irradiation angle adjustment) to the arm 6b. Further, since it is not necessary to immerse the lens in water during the daytime when natural light can be captured or when jellyfish is rarely generated, adhesion of barnacles and the like can be avoided. Further, if the operation of the winch 6e is stopped midway, the underwater illuminator body 6a can be displaced to an appropriate position in the water, and thus the irradiation direction of light can be changed. Note that the underwater illuminator body 6a may be configured so that its angle can be changed while being submerged in water. This can be realized, for example, by inserting an operation wire or the like into the arm 6b and connecting the end of the operation wire to the movable part of the mounting fixture of the underwater illuminator body.

In FIG. 2, reference numeral 7 denotes an image processing / measuring device, which performs image processing on a video signal monitored and photographed by the television camera 5 and transmitted to extract an image component of a jellyfish floating in water. It has a processing unit or an image processing function unit, and a unit or a measurement function unit for measuring the amount of jellyfish from the image. Reference numeral 8 is a jellyfish attack determination device, which captures and analyzes the measurement data output from the image processing and measurement device 7, determines whether or not a certain amount of jellyfish has occurred in the monitoring area, and determines whether or not a certain amount of jellyfish has occurred. It is a means for outputting an alarm signal to at least the alarm device 11 when the generated amount. An image display device (high-resolution monitor) 9 displays a raw image by the TV camera 5, a processed image by the image processing and measurement device 7, a jellyfish attack amount, and the like on the screen. Reference numeral 10 is a recording device including a time-lapse video. The image processing device 7, the jellyfish attack determination device 8, the image display device 9 and the recording device 10 are arranged in the operation room a of the power plant A.

The image processing / measuring device 7 includes an image processing computer for processing the chart shown in FIG.
In FIG. 5, 7a is an image processing unit or an image processing function unit, and 7b is a unit or measurement function unit for measuring the amount of jellyfish. Explaining the chart, if there are a plurality of TV cameras 5 in Steps 1 and 2, the desired image among them is displayed.
Select (Image at time T ₀ ) and select time T ₁ ~ in step 3.
Take in the image data of T ₃ and add the average with the previous image of T ₀
(Integration processing) is performed to remove random noise such as random reflection of waves and undulations to improve the video signal S / N. In step 4, the switching of the underwater illuminator 6 is used to detect whether the illuminator is turned on or off, and the day / night mode is switched. In the night mode, the image of the illumination captured in the image memory is eliminated. In step 5, the image is smoothed to reduce fluctuations and irregular reflection on the sea surface. Then, in step 6, the lightness and darkness of the object in the image is determined, and only the object (light body) that appears white on the screen is extracted. In step 7, contour correction is performed on the bright body in the composite image by spatial filtering or quadratic differentiation, and the contour is extracted or emphasized. In step 8, the point noise in the dark part is removed and the part where the outline of the bright body is missing is corrected. At step 9, the inside of the outline of the clear body is filled up with white. With the above, a jellyfish image (a geometrically closed white contour object) is extracted. Next, in the means for measuring the amount of jellyfish or the measuring function unit 7b, step 1
The area is calculated for each white contour object on the screen as 0, the area of each white contour object is integrated, and the ratio to the area of the entire screen is obtained. This occupancy rate is the amount of jellyfish generated, and this data is output to the jellyfish attack determination device 8 in step 11.

The jellyfish attack determination device 8 includes an analysis computer having an alarm output setting function unit, a data correction function unit, and a comparison determination function unit. The jellyfish attack danger value as a set value of the alarm output is input and stored in advance in the alarm output setting function unit. The set value of the jellyfish attack risk value may be arbitrarily set by actual measurement by biological sampling. Then, in the data correction function unit and the comparison determination function unit,
As the first step, the measurement data (jellyfish occupancy rate) from the image processing measuring device 7 is fetched and the average is calculated at time intervals. Then, as a second step, the measurement data is corrected by the correction data (correction calculation formula or correction program) incorporated in the analysis program. The correction data is at least the measurement data and the actual jellyfish amount.
It is determined in advance by correlating with (measurement by biological sampling), further correlating with the transparency of seawater, or further correlating with wind speed, wind direction, water temperature, and the like. As a third step, the change over time of the jellyfish amount data corrected in the previous step is graphed together with the alarm output set value, combined with the image-processed video, and displayed on the image display device 9 on the monitor. At the same time, the alarm device 1 is compared with the jellyfish amount data and the alarm output set value, and when the amount exceeds the jellyfish amount data set value.
An alarm signal is output to 1.

The alarm device 11 is the jellyfish attack determination device 8
It operates with the output from and outputs an optical or acoustic alarm when a jellyfish strikes. The alarm device 11 is provided not only in the operation room a but also in the quay 1 and the like. Further, the output unit of the alarm device 11 or the jellyfish attack determination device 8 is connected to the drive control unit of the jellyfish removing device 4 ′. This allows the jellyfish removing device 4'to be automatically activated when the jellyfish attack reaches a dangerous amount.

In the above embodiment, the television camera 5 and the underwater illuminator 6 are one set, but of course a plurality of sets may be arranged at different positions. Further, although the installation location is also the curtain wall portion in this embodiment, the point is that it is a place suitable for detecting the attack of jellyfish and the sea surface reflection is reduced as much as possible, so it is not limited to the embodiment. Instead, it may be on the quay side, or may be installed on both the quay side and the curtain wall portion. FIG. 6 shows a jellyfish attack detection system when there are a plurality of TV cameras (including underwater illuminators) 5 (for example, three), and the image processing and measurement device 7 and the jellyfish attack determination device 8 are configured as described above. Has become.
Each TV camera 5 is located upstream of the image processing / measuring device 7.
A video signal distribution unit 12 for distributing and transmitting the video output of the intake area photographed at 1, 5-2 and 5-3 to each of two systems is provided, and one system is a television camera sent from the video signal distribution unit 12. Image processing measuring device 7 by selecting any one of the video outputs of 5-1 5-2 5-3
A video signal selection unit 13 for inputting to is provided. The video signal selection unit 13 includes an automatic switching circuit that automatically replaces the output images of the three cameras at designated time intervals (for example, about every 10 seconds, about 30 seconds, and about 60 seconds), and an arbitrary switching circuit. It is preferable to have a manual switching circuit for selecting and switching only the image of the camera. A display screen selection output unit 15 is provided in the other system. The display screen selection output unit 1
Reference numeral 5 denotes a multi-division circuit that divides the screen of the image display device 9 into a number of screens (for example, 4 screens) that is at least one greater than the number of TV camera images, and displays the respective images on the image display device 9 at the same time. It has a circuit that selectively displays TV camera images on only one screen.

The jellyfish attack determination device 8 is divided into two systems on the video signal output side, one is connected to the display 16 for displaying graphed data, and the other is combined with the output of the image processing and measuring device 7 and the screen synthesis. The image synthesizing unit 14 is connected to the unit 14, and the jellyfish increase / decrease graph image and the image-processed image are synthesized by the screen synthesizing unit 14. The output side of the screen synthesizing unit 14 is connected to the display screen selection output unit 15. There is. The jellyfish attack determination device 8 is electrically connected to the alarm circuit 11 as described above, and sends a data signal when it is determined that the amount of jellyfish attack exceeds the dangerous value. It is connected to the drive control unit 40 of the removing device 4 ′. In the present invention,
The image processing measurement device 7 may have a device configuration in which the image processing function unit and the measurement function unit are separate and independent, or may be a device in which the measurement function unit and the jellyfish attack determination device 8 are integrated. .

Next, the method of the present invention will be described using the apparatus of the above-mentioned embodiment. In the present invention, one or more television cameras 5 installed in the hollow of the site continuously monitor and photograph the water surface in a certain area where a jellyfish is expected to hit. In this case, shooting is performed with natural light in the daytime, and at night or in cloudy weather, the underwater illuminator 6 is operated to illuminate the shooting area of the television camera 5 from underwater in order to improve the visual recognition accuracy. The zoom degree of the television camera 5 and the on / off of the underwater illuminator 6 are controlled by inputting a signal from the remote operation device 5b in the operation room a of the power generation plant A to the control device 5a. The situation video including the jellyfish 18 obtained by the television camera 5 is transmitted via the relay device, input to the image processing and measuring device 7 in the operation room a, and the jellyfish component in the image is extracted according to the steps of FIG. Image processing is performed. 7 to 11
Shows this process schematically. As shown in FIG. 7 (a), the sea surface reflection component 170 of (b) is subtracted as noise from the raw image 17 taken by the TV camera 5 and reflected as shown in FIG. 8 (b). A component-removed first stage image 17a is created.

The first stage image 17a is further subjected to image averaging processing. That is, since there is a difference between the speed of the wave and the speed of the jellyfish, the slow object in the image is focused, and the wave component 171 is smoothed as shown in FIG. 8 (b) to become the flat component 172 as shown in (c). To process. This averaging may be performed by appropriately determining the optimum value based on experience. As a result, the second-stage image 17b in which irregular reflection due to wave fluctuation is reduced is created as shown in FIG. In order to improve the accuracy of measuring the amount of jellyfish generated, the seawater color is emphasized in dark color (black) or the color of the jellyfish as the target (white) is emphasized, and an image with a sharp outline and strong contrast as shown in FIG. Further, if there is a hole in the contour, the outline is filled to create the final composite image 17c.

When the underwater illuminator 6 is used together, such as during nighttime photography, the light emitted from the underwater illuminator 6 causes a large noise in the camera live image. However, when the underwater illuminator is turned on, the sea surface reflection and wave fluctuation have almost no effect. Therefore,
As the image processing of the image processing / measuring device 7, if the image processing for extinguishing the irradiation light as noise is performed, only the jellyfish image under the water surface can be clearly highlighted. The image may be processed as described above.

The final composite image 17c obtained by extracting the jellyfish components as described above is then subjected to area calculation and integration for each jellyfish on the screen in the measurement function section.
The ratio with the area of the entire screen is obtained. This is because, for example, the image is scanned at high speed, the three-dimensional luminance distribution is created in response to the white of the jellyfish component, and the number of white mountains is determined.
(Or even height) is counted, and the white occupation ratio on the screen, that is, the occupancy ratio of jellyfish is a numerical value such as 100.
It is performed by continuously or automatically measuring a fraction at fixed time intervals (for example, every 10 seconds). As shown in FIG. 11, the measurement data k is output to the image display device 9 together with the final processed image 17c and the elapsed time h such as date and time, and is also input to the data analysis computer of the jellyfish attack determination device 8. Then, here, as described above, the risk level value k ₁ of the jellyfish attack amount is corrected by the correction data, and the increase or decrease of the correction data k ′ is set and input in advance.
If the correction data value k ′ is lower than the danger level value k ₁ , the warning signal is not issued and the correction data value k ′ is
When exceeds the dangerous level value k ₁ , an alarm signal is output to the alarm device 11 and the buzzer or lamp is activated. Alternatively or additionally, a signal is sent to the drive control unit 40 of the jellyfish removing device 4 ', and the operation is performed at the drive amount and the time corresponding to the jellyfish amount. The correction data is also graphed at the same time, and the graph 19 is displayed on the display 16 as shown in FIG. 12 and is also sent to the image display device 9 via the image synthesizing section 14 to display the final processed image 17c and the image synthetically. To be done. By the above, it is possible to accurately and accurately monitor the attack of jellyfish and cope with a large number of jellyfish outbreaks.

When a plurality of television cameras 5 are used in the present invention, as shown in FIG.
Monitoring video signal ch. 1, c
Each of h2 and ch3 is branched and input to the video signal selection unit 13 and the display screen selection output unit 15 via the video signal distribution unit 12, and a desired TV camera image is selected by the display screen selection output unit 15 to obtain one image. Is sent to the image processing / measuring device 7, the image processing and measurement are performed as described above, the data is input to the jellyfish attack determination device 8 and the analysis determination process is performed as described above, and the alarm circuit 11 is used when necessary. Is output as an alarm signal.

In the case of this number channel system, the graph image 19 of the risk level value k ₁ and the correction data value k ′ shown in FIG. 12 is displayed on the display 16, while the monitor 10 is operated by the operation of the display screen selection output unit 15. The screen is divided into a plurality of screens as shown in FIG. 14, and raw images 17-1 and 17 of each channel are displayed.
2, 17-3, and the combined image 17-4 including the corrected data value k ′ shown in FIG. 13, the graph image 19 thereof, the elapsed time h such as date and time, and the final processed image 17c are simultaneously displayed. Therefore, according to this information, from which direction to the intake 2, or if there are multiple intakes, to which intake, how much jellyfish is attacking,
The degree of the danger can be immediately visually recognized in the operation room a.

[0027]

According to the first and second aspects of the present invention described above, not only the condition of jellyfish gathering around the intake of a thermal power plant is visually grasped by a television camera, but also a visual image thereof is obtained. Since the light reflection wave is processed to extract the jellyfish component, the attack of the jellyfish can be detected reliably and accurately, and the increase / decrease in the amount of attack of the jellyfish can be quantified by using image processing video. It is possible to automatically activate the jellyfish removing device and prevent the jellyfish from being sucked and blocked at the water intake port, since the alarm signal is issued when the attack exceeds a certain level. Moreover, since it is only necessary to arrange an underwater illuminator in the water, and it is not necessary to use large equipment such as piping for bubbling or an air conditioner press, it can be implemented inexpensively using existing equipment. The effect is obtained. According to the third aspect, since the high-sensitivity TV camera is used as the TV camera and the underwater metal halide light is used as the underwater illuminator, the jellyfish can be visually recognized in a wide range and at a long distance even when the transparency is low and at night. Therefore, an excellent effect that the accuracy of the jellyfish attack monitoring can be improved can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an outline of a device for automatically monitoring jellyfish attack on a water intake according to the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a front view showing a specific configuration example of a photographing unit in the present invention.

FIG. 4 is a cross-sectional view showing a specific example of the configuration of a photographing unit according to the present invention.

FIG. 5 is a chart of image processing measurement according to the present invention.

FIG. 6 is a system diagram when a plurality of television cameras are used.

FIG. 7 is an explanatory diagram schematically showing a first stage of an image processing example by the image processing measuring device.

FIG. 8 is an explanatory diagram schematically showing a second stage of an image processing example by the image processing measuring device.

FIG. 9 is an explanatory diagram schematically showing an image at the time of the second stage processing measurement.

FIG. 10 is an explanatory diagram schematically showing a state at the final stage of image processing by the image processing measuring device.

FIG. 11 is an explanatory diagram schematically showing the final processed image after the jellyfish attack amount measurement.

FIG. 12 is an explanatory diagram showing a graphed example of a jellyfish attack amount measurement value and a dangerous value.

FIG. 13 is an explanatory diagram illustrating an example of image composition.

FIG. 14 is an explanatory diagram showing an example of screen division when a plurality of television cameras are used.

[Explanation of symbols]

 2 Water intake 5 Television camera 6 Underwater illuminator 7 Image processing and measurement device 8 Jellyfish attack determination device 11 Alarm device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroo Katai 1974-4 Kusanagi, Shimizu City, Shizuoka Prefecture (72) Inventor Tetsuyuki Inoue 659-25 Semata, Ichihara City, Chiba Prefecture

Claims (4)

[Claims] 1. A water surface region around an intake is continuously captured as a visual image, the image is image-processed to extract jellyfish components, and the amount of jellyfish is measured from the processed image. A method for automatically monitoring a jellyfish attack on an intake, which is characterized by outputting an alarm signal when it exceeds the limit. 2. A television camera installed on land near the intake port for continuously photographing the sea surface of a required area, an underwater illuminator for lighting the underwater of the camera photographing area when necessary, and a jellyfish from the image photographed by the television camera. The image processing means for extracting the components, the means for measuring the amount of jellyfish from the output image of the image processing means, and the jellyfish attack determination means for outputting an alarm signal when the amount of jellyfish output from this exceeds a predetermined amount. An automatic jellyfish attack monitoring device for the intake, which is characterized by being equipped. 3. The jellyfish attack automatic monitoring device for an intake according to claim 2, wherein the image processing means and the means for measuring the amount of jellyfish are incorporated as a functional unit in a single device. 4. The jellyfish attack automatic monitoring device for an intake according to claim 2, wherein a high-sensitivity television camera is used as the television camera, and an underwater metal halide light is used as the underwater illuminator.