JP2017192329A - Fishing net shape identifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fishing net shape identifying device that enables a ship operator to properly recognize an arrangement state in the water of a fishing net while performing fishing, and thereby perform efficient fishing.SOLUTION: An image/video display device 10A of a ship 10B comprises: a shape setting unit 211 for setting a specific shape formed by the arrangement of an initial state of a fishing net when the fishing net is cast in the water as information to display as an image; a shape change identification unit 212 for identifying a change in shape of the fishing net from the specific shape when the fishing net set by the shape setting unit 211 is drawn by the ship 10B; and an image forming unit 213 for forming an image enabling a ship operator to visually recognize a real-time shape of the fishing net on the basis of the information on the specific shape and a change in shape of the fishing net, and displaying the formed image on a display unit 23.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for allowing a ship operator to recognize the shape of a fishing net that changes with the navigation of a vessel towing a fishing net when performing bottom net fishing.

  As one of the methods of fishing in the ocean or the like, bottom net fishing is known in which a vessel fishes by towing a bottom net. In this fishing method, in order to increase the amount of catch for each fish and achieve high fishery results, before catching, many catches (underwater seafood. .)) Must be placed underwater so that it can be driven. In the arrangement of the bottom net, the shape of the bottom net in a plan view (as viewed from above) is particularly important.

  Here, in general, in order to increase the amount of catch, a pair of ropes connected to the net body of the bottom net is arranged in water so that it becomes a substantially rectangular shape like a rhombus, and the ship then makes this pair of ropes. It is said that it is better to tow the bottom net by navigating while sailing.

  Conventionally, in order to arrange the rope of the bottom net in an ideal substantially rectangular shape, the rope of the bottom net along with the position of the ship is displayed on the chart displayed on the display section (CRT screen) provided in the ship maneuvering section etc. A technology of a boat maneuvering support apparatus that displays a substantially rectangular figure for placement is known (see, for example, Patent Document 1). The ship operator uses this figure as a planned route and hangs the rope of the bottom net underwater while maneuvering so that this figure and the wake of the ship substantially coincide. That is, it becomes possible to arrange the rope of the bottom net in an ideal substantially rectangular shape in plan view while visually recognizing the graphic and wake displayed on the display unit.

JP-A-7-198406 (paragraphs [0041] to [0043], [FIG. 2], [FIG. 3], [FIG. 4], etc.)

  Here, when fishing starts after the bottom net is arranged in the water, the shape of the rope when it is arranged collapses because it is towed by the ship. For example, the substantially rectangular shape in plan view described in Patent Document 1 has a diagonal line in the length direction (on the traveling direction side of the ship; the same applies hereinafter) as the rope is towed by the ship. On the other hand, the shape of the rope in plan view is deformed so that the diagonal line in the width direction (substantially perpendicular to the traveling direction of the ship; hereinafter the same in this specification) becomes gradually shorter. If this deformation progresses and the diagonal in the width direction of the rope becomes too short, the opening portion of the net body of the bottom net becomes narrow, and it becomes impossible to drive underwater prey into the net body. In this state, the boat operator once raises the bottom net and catches the prey inside the net body, and then places the bottom net again in the water for fishing.

  However, in the invention described in Patent Document 1, the operator cannot visually recognize the change in the arrangement of the rope arranged in the water after starting fishing on the display unit. Therefore, there is a problem that it is difficult to perform efficient fishing, as well as recognizing the opening state of the net body of the bottom net by relying on intuition.

  The present invention has been made in view of the above problems, and enables an operator to appropriately recognize the state of arrangement of a bottoming net in the middle of fishing to enable efficient fishing. It is an object to provide an apparatus for identifying the shape of a bottom net.

  In order to solve such a problem, the invention according to claim 1 is characterized in that the net body in the net body is towed by the ship with a net body that captures prey in water and a rope that connects the net body and the ship. A fishing net shape display device for displaying a shape of a fishing net that captures a prey that changes over time during the towing, and is formed by an initial arrangement of the fishing net when the fishing net is dropped into water. Shape setting means for setting the specific shape as information for displaying as an image, and when the fishing net set by the shape setting means is trawled by the ship, the fishing net from the specific shape Based on shape change specifying means for specifying a change in shape, information on the specific shape of the fishing net, and information on the change in shape, the shape of the fishing net in real time can be visually recognized. Image is formed and is characterized in that an image forming means for displaying on the display means an image which is the form.

  According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the image forming unit causes the display unit to display the shape of the rope of the fishing net that changes with time. .

The invention according to claim 3 includes, in addition to the configuration according to claim 1 or 2, the shape change specifying unit includes a navigation state specifying unit that specifies a predetermined navigation state when the ship has navigated,
The shape change specifying means specifies the change in the shape of the fishing net depending on the information on the predetermined navigation state of the ship specified by the navigation state specifying means.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the navigation state specifying unit specifies a navigation distance of the ship, and the shape change specifying unit is specified by the navigation state specifying unit. Further, the shape of the fishing net is specified by predicting the change in the shape of the fishing net over time depending on the navigation distance of the ship.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, the shape change specifying unit includes a net state specifying unit that specifies an opening state of the net body, The shape change specifying means uses the information on the opening state of the net body specified by the net state specifying means when specifying the change in the shape of the fishing net.

  According to a sixth aspect of the present invention, in addition to the configuration according to any one of the first to fifth aspects, the shape change specifying means includes a tidal current specifying means for specifying a tidal current around the ship, and the shape The change specifying means uses the information of the tidal current specified by the tidal current specifying means when specifying the change in the shape of the fishing net.

  The invention according to claim 7 is characterized in that, in addition to the configuration according to any one of claims 1 to 6, the fishing net is a bottom net.

  ADVANTAGE OF THE INVENTION According to this invention, a boat operator can recognize the arrangement | positioning state in the water of the fishing net in the middle of fishing appropriately, and it becomes possible to perform efficient fishing.

It is a functional block diagram which shows the whole structure of the image and video display apparatus as a "fishing net shape display apparatus" concerning this embodiment. The figure which shows typically the display of the specific shape as an initial state which installed the bottom net in the water in the display part of an image / video display device same as the above, (b) The opening of the net body of the bottom net after starting fishing It is a figure which shows typically the display of the state which reached the limit value by reducing the opening width of. The procedure of setting the initial state of the bottom net by the ship using the image / video display device according to this embodiment, and the state in which the specific shape of the bottom net and the shape after starting fishing have changed in the image / video display device FIG. It is a figure which shows typically the whole structure of the ship using the image and video display apparatus which concerns on this embodiment, and a bottom net.

[Basic configuration]
1 to 4 show an embodiment of the present invention.

  FIG. 1 is a functional block diagram showing the overall configuration of a ship and an image / video display device as a “fishing net shape display device” according to this embodiment.

  An image / video display device 10A as a “fishing net shape display device” according to this embodiment shown in FIG. 1 is mounted on a ship 10B, and the operator properly recognizes the arrangement state of the fishing net in water. It is used for

  A boat 10B shown in FIG. 4 is a fishing boat that mainly performs bottoming net fishing by “spreading” (in this embodiment, the boat 10B is a fishing boat that performs bottoming net fishing by “turning”). explain.). That is, the ship 10 </ b> B connects the rope 32 of the bottom net 31 as a “fishing net” and crawls the net body 33 installed on the bottom of the water to capture the prey 34. Note that the vessel 10B may be any fishing vessel that performs fishing by towing a fishing net such as bottom net fishing.

  As shown in FIG. 1, the image / video display device 10A according to this embodiment is supplied with a signal from an antenna 10 mounted on a ship 10B.

  The image / video display device 10A includes an A / D conversion unit 11, a signal processing unit 12, a coordinate conversion unit 13, a video memory 14, an operation unit 15, and a position information acquisition unit 16 as a “navigation state specifying unit”. Direction information acquisition unit 17 as "navigation state identification means", speed information acquisition unit 18 as "navigation state identification means", network information acquisition unit 19 as "network state identification means", tidal current as "tidal current identification means" An information acquisition unit 20, a control unit 21, a graphic memory 22, and a display unit 23 as “display means” are provided, and a function as a radar indicator is provided.

  Further, the control unit 21 includes a shape setting unit 211 as a “shape setting unit”, a shape change specifying unit 212 as a “shape change specifying unit”, and an image forming unit 213 as an “image forming unit” as functional units. ing. Furthermore, the shape change specifying unit 212 includes, as function means, a distance specifying unit 2121 as “navigation state specifying means”, a network state specifying unit 2122 as “network state specifying means”, and a tidal current specifying as “tidal current specifying means”. Part 2123 is provided. These functional means may be formed as hardware logic, or may be formed as a result of execution of a program in the control unit 21.

  The position information acquisition unit 16, the direction information acquisition unit 17, the speed information acquisition unit 18, and the distance specification unit 2121 of the control unit 21 specify a predetermined navigation state when the ship 10 </ b> B has navigated. "Means" is formed, and the navigation distance of the ship 10B is mainly specified. The “navigation state specifying unit” may be configured by any one or a combination of the position information acquisition unit 16, the direction information acquisition unit 17, and the speed information acquisition unit 18 and the distance specification unit 2121. Good.

  The network information acquisition unit 19 and the network state specifying unit 2122 of the control unit 21 form “network state specifying means” that detects the opening state of the network body 33. This “net state specifying means” specifies the open state of the net body 33 based on information detected directly or indirectly.

  The tidal current information acquiring unit 20 and the tidal current identifying unit 2123 of the control unit 21 form “tidal current identifying means” that identifies the tidal current around the ship 10B.

  The antenna 10 includes a power feeding unit 101, a radiation unit 102, and a detection / amplification unit 103. The antenna 10 emits a microwave pulse or the like generated by the power supply unit 101 to the outside as a detection signal from the radiation unit 102, and receives a reflection signal reflected from the target signal or the like as a reception signal by the radiation unit 102. Then, the detection / amplification unit 103 detects and amplifies the received signal.

  The A / D converter 11 receives a detection signal and a reception signal from the antenna 10 and converts the detection signal and the reception signal from an analog signal to a digital signal.

  The signal processing unit 12 performs various processes for forming an image for displaying information such as the position of the target with respect to the reception signal converted into a digital signal by the A / D conversion unit 11. Specifically, for example, the data of the time elapsed from the transmission of the detection signal to the reception of the reception signal after receiving the detection signal and the reception signal (information for specifying the distance from the ship 10B to the target) Corresponding to the transmission / reception direction of the detection signal and the reception signal, that is, the angular position of the antenna 10 (corresponding to information for specifying the direction of the target with respect to the ship 10B), Form. In addition, the signal processing unit 12 performs various processes for removing signal noise. Further, the signal processing unit 12 includes a buffer (not shown), and temporarily records data conforming to the formed polar coordinate system. Note that the antenna 10 may be arranged up to the A / D conversion unit 11 and the signal processing unit 12.

  The coordinate conversion unit 13 converts the coordinate system of data conforming to the polar coordinate system formed in the signal processing unit 12 from the polar coordinate system to the orthogonal coordinate system by address control. In addition, the coordinate conversion unit 13 also performs a correlation process with a past video for noise removal. Note that the antenna 10 may be arranged up to the coordinate conversion unit 13.

  The video memory 14 has a function of temporarily recording data based on the received signal obtained by converting the coordinate system into the orthogonal coordinate system by the coordinate conversion unit 13. The data recorded in the video memory 14 includes information for visualizing the current position of the target (for example, another ship), and a trajectory (for example, the track of another ship) that the target has moved in the past predetermined time. ) Is used as information for imaging.

  The operation unit 15 is an image based on various operations for an operator (for example, a ship operator of the ship 10 </ b> B) to form an image related to the shape of the bottom net 31 in the image / video display device 10 </ b> A and signals supplied from the antenna 10. Various devices for performing various operations for forming the. Specifically, the operation unit 15 includes various devices necessary for operation by an operator for performing such control, such as buttons, levers, rotary knobs, mice, and commands based on specific numerical values and character information. A keyboard, a touch panel, etc. are provided. The operation unit 15 operates the control content of the control unit 21 when operated by an operator. Specifically, by operating the operation unit 15, basic information and installation state information of the bottom net 31 are input, and various processes such as adjustment of images and videos displayed on the display unit 23 are operated. The In this embodiment, for the sake of simplicity of explanation, the operator of the operation unit 15 is hereinafter also referred to as a “ship operator”, assuming that the operator operates the operation unit 15.

  The position information acquisition unit 16 is, for example, information on the current position of the ship 10B from a GPS receiver (not shown) or a receiver (not shown) of a signal transmitted from a radio base station or the like installed on the ground. (Latitude / longitude information, etc.) is acquired. Note that the position information acquisition unit 16 may be configured to acquire information on the current position of the ship 10B from a distance sensor, a distance measuring device, or the like that detects information on the movement distance of the ship 10B.

  The azimuth information acquisition unit 17 has a function of acquiring various information related to the azimuth from a configuration that detects various information related to the azimuth such as the traveling direction of the ship 10B and the bottom net 31 such as a geomagnetic sensor (not shown).

  The speed information acquisition unit 18 detects the speed and acceleration of the ship 10B using Doppler effects such as laser light, microwaves, and ultrasonic waves, such as a speed sensor (not shown) and an acceleration sensor (not shown). It has a function of speed information and acceleration information.

  The net information acquisition unit 19 acquires angle information from an angle sensor (not shown) that detects various information of the bottom net 31 by actual measurement. Specifically, for example, the net information acquisition unit 19 detects the opening angle of the pair of ropes 32 of the bottom net 31 (in a plan view of the rope 32 in the portion connected to the ship 10B) detected by an angle sensor (not shown). (An opening angle d1 and an opening angle d2 shown in FIG. 3 correspond to this).

  The tidal current information acquisition unit 20 has a function of acquiring tidal current direction and speed information from a direction sensor (not shown) and a speed sensor (not shown) that detect a tidal current direction and speed around the ship 10B. For example, the tidal current information acquisition unit 20 detects the direction and speed of the water flow around the ship 10B detected by an azimuth sensor (not shown) and a speed sensor (not shown) provided on the bottom of the ship 10B. Get information.

  In this embodiment, the position information acquisition unit 16, the azimuth information acquisition unit 17, the speed information acquisition unit 18, the network information acquisition unit 19, and the tidal current information acquisition unit 20 are separate from these GPS receivers and various sensors. Various configurations are provided for the control unit 21 to acquire information from the configuration. However, these configurations may be provided in the GPS receiver or the various sensors themselves.

  The control unit 21 includes, for example, a microcomputer, a microprocessor, a wired logic, a sequence control device, and the like.

  The control unit 21 performs a predetermined process on the basis of a predetermined instruction (for example, operation of the operation unit 15 by a ship operator, execution of a program, etc., which is the same in this specification). Specifically, for example, the control unit 21 operates the various components in the image / video display device 10A by operating the operation unit 15 or executing a program by a ship operator, and responds to signals and information supplied from the various components. Processing such as analysis and various operations, formation of an image of the bottom net 31, adjustment and correction of the formed image, and the like are performed.

  The control unit 21 forms and adjusts an image based on a signal supplied from the antenna 10 by operating the operation unit 15 or executing a program by the operator. Further, the control unit 21 has a function of recording data and numerical values input from the operation unit 15 and data and numerical values based on various programs and processing results of the programs.

  The shape setting unit 211 provided in the control unit 21 sets a specific shape formed by the initial arrangement of the bottom net 31 when the bottom net 31 is dropped into water as information for displaying as an image. This specific shape is virtually formed by data input by the operator operating the operation unit 15. Alternatively, the specific shape is formed on the basis of actual measurement values such as wake information based on signals from the antenna 10 and detection information from the position information acquisition unit 16.

  In this embodiment, the “specific shape” is a shape in plan view in the initial state of the rope 32 of the bottom net 31 and mainly indicates a shape that is likely to increase the catch. As described above, the “specific shape” may be virtually formed or may be formed based on an actual measurement value (in this embodiment, it will be described later). As described in [Procedure 2], it is assumed that a “specific shape” is virtually formed.) This “specific shape” is a shape other than the rope 32, for example, the net body 33. The shape may be a specific shape, or may be a shape other than a plan view shape, for example, a side view shape or a shape shown in a perspective view.

  The shape change specifying unit 212 provided in the control unit 21 is based on the information acquired by the position information acquisition unit 16 and the azimuth information acquisition unit 17, the information detected by the speed information acquisition unit 18 and the like, and the like. The bottom net 31 after acquiring information on the navigation state of the ship (the track from the past to the present of the ship 10B, the navigation direction, the navigation speed, etc.), performing a predetermined calculation based on these information, and starting fishing Of the shape of the rope 32 in water, in particular, the temporal change in the shape of the rope 32 in plan view.

  The distance specifying unit 2121 provided in the control unit 21 navigates the ship 10B based on the information acquired by the position information acquisition unit 16, the information acquired by the direction information acquisition unit 17, and the information detected by the speed information acquisition unit 18. Identify the distance. The distance specifying unit 2121 may use all of the information acquired by the position information acquiring unit 16, the direction information acquiring unit 17, and the speed information acquiring unit 18 for specifying the navigation distance of the ship 10B, or a part of the information. Only information may be used.

  The net state specifying unit 2122 provided in the control unit 21 is the position of the rope 32 and the net body 33 of the bottom net 31 acquired by the net information acquisition unit 19, or the rope 32 of the bottom net 31 after starting fishing. Based on the actual measurement information of the position and shape of the net body 33, the shape and position of the bottom net 31 are specified. The information specified by the net state specifying unit 2122 is used in the shape change specifying unit 212 as information that replaces the value calculated by the calculation or complements the value calculated by the calculation.

  The tidal current specifying unit 2123 provided in the control unit 21 specifies the direction and size of the tidal current based on the information on the tidal current around the ship 10 </ b> B detected and acquired by the tidal current information acquiring unit 20. The information specified by the tidal current specifying unit 2123 is used as information for complementing the value calculated by the calculation in the shape change specifying unit 212.

  The image forming unit 213 forms an image in which the shape of the bottom net 31 can be visually recognized based on the information set by the shape setting unit 211 and the information on the shape change specified by the shape change specifying unit 212. In this embodiment, the image forming unit 213 forms an image showing the shape of the bottom net 31 in plan view. However, any image such as an image showing a side view shape or an image showing a state of a perspective view may be formed. In the image forming unit 213, an object other than the bottom net 31, for example, an image of the ship 10B or the like may be formed.

  The graphic memory 22 is, for example, a RAM and has a function of temporarily recording data. The graphic memory 22 temporarily records the image formed in the image forming unit 213.

  The display unit 23 includes an image forming unit that forms an image formed based on a signal supplied from the antenna 10, and a display 23A having a scan function such as a raster scan method (see FIGS. 2A and 2B). ). The display unit 23 has a function of displaying the image formed by the image forming unit 213 on the display 23A together with the video. That is, the display unit 23 displays, for example, information on the current position of the target 30 (see FIG. 2A), a video of the wake, and a plan view shape of the bottom net 31 installed on the ship 10B on the display 23A. indicate.

  The display unit 23 has a function as a touch panel, and is configured so that the operator can input information such as the position of the bottom net 31 and the position of the target by tracing the screen with a finger or a touch pen. Also good.

[Processing Procedure 1 / Procedure for Displaying Video]
Next, in the image / video display device 10A according to this embodiment, a processing procedure for displaying a video on the display unit 23 will be described.

First, the ship operator of the ship 10B turns on a power switch (not shown) of the image / video display device 10A. As a result, the image / video display device 10A enters a standby state. In this state, when the operator operates the transmission, the image / video display device 10A
A detection signal is emitted from the radiation unit 102 of the antenna 10 to the outside of the ship 10B, and a reflection signal reflected by the target signal or the like is received by the radiation unit 102 to obtain a reception signal.

  The received signal is detected and amplified by the detection / amplification unit 103, and the detection signal and the received signal are supplied to the signal processing device 10C. In the A / D conversion unit 11 of the signal processing device 10 </ b> C, the detection signal and the reception signal supplied from the antenna 10 are converted from an analog signal to a digital signal and supplied to the signal processing unit 12.

  In the signal processing unit 12, polar coordinate-based data (data specifying the distance and direction of the target) is formed using the detection signal and the reception signal supplied from the A / D conversion unit 11. This data is temporarily recorded in a buffer (not shown) of the signal processing unit 12.

  In the coordinate conversion unit 13, the data coordinate system is converted from a polar coordinate system to an orthogonal coordinate system, and a noise removal operation is performed. In the video memory 14, data converted into an orthogonal coordinate system is recorded.

  The display unit 23 displays the situation of the surrounding water area centering on the ship 10B (information such as the position and locus of the target).

[Processing Procedure 2 Image Formation Procedure (1)]
Next, a processing procedure for forming an image such as the shape of the bottom net 31 to be displayed on the display unit 23 in the image / video display device 10A according to this embodiment will be described.

  The ship operator makes a state in which an image can be displayed by the control unit 21 by operating the operation unit 15 before starting bottom net fishing.

Then, the ship operator, by operating the operation unit 15 to input the installation state and dragnet 31 ₁ in the initial state shown in FIG. 3, dragnet 31 basic information (in FIG. 2 (a) (b) refer).

Specifically, for example, the ship operator draws the installation position of the rope 32 of the bottom net 31 and the net body 33 as shown in FIG. 2A on the display unit 23 having a function as a touch panel. The installation position of the bottom net 31 ₁ (see FIG. 3) in the initial state is input by inputting the installation position of the rope 32 and the net body 33 of the bottom net 31 as numerical information such as latitude and longitude using a keyboard or the like. In addition, the ship operator uses a touch panel, a keyboard, etc., the material and weight of the net body 33 of the bottom net 31, the size of the opening 37 (see FIG. 2, FIG. 3), the material, weight and length of the rope 32, etc. The basic information of the bottom net 31 is input.

  By operating the operation unit 15, the ship operator operates the basic information of the ship 10B itself, such as the total length of the ship 10B, the amount of drainage, the engine output, the maximum speed, the number of crew members of the ship 10B, the weight of the loaded cargo, and the loaded fuel Information on people and objects mounted on the ship 10B, the amount, etc., weather, wind direction, wind strength, basic tidal current direction of the surrounding sea area, etc., the installation state of the ship 10B and the bottom net 31 and the shape after starting fishing Information on external factors that may affect the change in the number may be input.

These pieces of information input by the operation unit 15 are recorded in the control unit 21. And the shape setting part 211 specifies the shape etc. of the bottom net 31 ₁ (refer FIG. 3) of the initial state as a specific shape based on such information. Here, as shown in FIG. 3, the specific shape of the dragnet 31 _1, the plan view shape is specified in a substantially rhombus.

The image forming unit 213, and the particular shape setting unit 211, forms an image of the dragnet 31 ₁ in the shape of the initial state of the specific shape.

In this state, the boat operator installs the bottom net 31 in the water area where bottom net fishing is performed. Specifically, the rider has identified the shape setting unit 211, is sailing vessels 10B so that dragnet 31 ₁ in the shape of the initial state. For causing navigation of such vessels 10B easily, on the display unit 23, so that the wake of the dragnet 31 ₁ in the form of images and ships 10B in the initial state where the image forming unit 213 is formed is displayed superimposed It may be configured.

  First, as schematically shown in FIG. 3, a mark 35 (for example, a buoy) attached to one end portion of the pair of ropes 32 of the bottom net 31 is dropped onto the water. After that, the rope 32 is dropped into the water while maneuvering along the place where the bottom net 31 is to be installed.

  For example, when the rope 32 is installed in a substantially rectangular shape, first, the wake 36 of the ship 10B has a shape in plan view along two adjacent sides of the rectangle (that is, the arrow a in FIG. 3). Then, along the arrow b), the rope 32 on one side is installed in the water.

  And after dropping of the rope 32 on one side is completed, the net body 33 connected to the rope 32 is dropped into the water from the ship 10B. Then, while dropping the rope 32 on the other side connected to the net body 33, the wake 36 of the ship 10B has a shape along two adjacent sides of the rectangle in plan view (ie, FIG. 3), the rope 32 on the other side is installed in the water.

When the ship 10B returns to the position of the mark 35, the tip of the rope 32 on one side is collected on the ship together with the mark 35, and the pair of ropes 32 are connected to the ship 10B. In this state, the installation of the bottom net 31 (the bottom net 31 ₁ in the initial state in FIG. 3) in the initial state is completed.

3 shows, dragnet 31 ₁ in the initial state shows the installed state in the water in a state where the image forming unit 213 forms images and have substantially matched. Shown in the figure, dragnet 31 ₁ in the initial state, the pair of ropes 32 is approximately rectangular in shape. The net body 33 is installed at the position of one vertex (the position of the lowest vertex in FIG. 3) of the substantially rectangular shape in plan view, and the position of the vertex on the diagonal line of the vertex (the highest vertex in FIG. 3). The position of the ship 10B is located. Incidentally, actually the installed dragnet 31 ₁ in the shape of the initial state, the initial state of the image forming unit 213 to form dragnet 31 may not exactly match the _first shape.

[Processing Procedure 3 Image Formation Procedure (2)]
Consider the case where the ship 10B starts towing the bottom net 31 and starts fishing after [Processing Procedure 2]. At this time, the prey 34 is driven into the net body 33 and captured.

At this time, as shown in FIG. 3, the rope 32 of the bottom net 31 is pulled in the traveling direction of the ship 10B shown by P1 in FIG. 3 by the propulsive force of the ship 10B. Along with this, a force in the direction of narrowing the width direction indicated by the arrow P2 in FIG. As a result, as shown in FIG. 3, the bottom net 31 is gradually deformed in a direction in which the opening angle d <b> 1 in the initial state in the shape of the rope 32 in a plan view is narrowed. At the same time, the width of the opening 37 of the net body 33 gradually decreases. Thus, shown in FIG. 3, the plan view shape of dragnet 31 ₁ rope 32 in the initial state as a particular shape, as fishing proceeds, the plan view shape of the dragnet 31 ₂ rope 32 shown in FIG. 3, i.e., The ship 10B is deformed into a vertically long substantially rhombus that is long in the traveling direction of the ship 10B and has a small width direction size L1.

  The shape change specifying unit 212 derives a change in the plan view shape of the rope 32 and the plan view shape of the net body 33 of the bottom net 31 after the start of the bottom net fishing by a predetermined calculation, and the derived shape is converted into the bottom net. 31 predicted shapes are set.

  As the predetermined calculation, for example, the following can be considered.

<Calculation method 1 / Calculation using the moving distance of the ship>
The shape change specifying unit 212 measures the moving distance of the ship 10B, and predicts a change in the plan view shape of the rope 32 and the net body 33 using the distance as a parameter of the shape change. For example, the travel distance of the ship 10B acquired by the position information acquisition unit 16, the direction information acquisition unit 17, and the speed information acquisition unit 18 shown in FIG. 1 (this may be a linear distance of movement, 10B may be used as a parameter), and a predetermined calculation is performed. Depending on this moving distance (for example, in proportion to the moving distance), the length direction and width of the rope 32 The predicted value of the change in the planar view shape of the rope 32 and the net body 33 of the bottom net 31 is calculated so that the size of the direction changes.

<Calculation method 2 / Calculation using ship speed>
The shape change specifying unit 212 performs a predetermined calculation using the speed of the ship 10B as a further parameter when calculating the above <Calculation Method 1>. For example, the speed information acquisition unit 18 detects the navigation speed of the ship 10B and uses this speed information for the predetermined calculation. Specifically, for example, even if the moving distance of the ship 10B is the same, the parameters are set so that the change in shape is large if the speed of the ship 10B is fast, and the change in shape is small if the ship 10B is slow. > Operation is performed.

  In addition, as a predetermined calculation for calculating the plan view shape of the rope 32 of the bottom net 31 and the plan view shape of the net body 33, for example, a method of specifying the shape using the following measured values is also considered. It is done.

<Calculation method 3 / Calculation based on actual measurement information of bottom net>
The shape change specifying unit 212 specifies the shape of the bottom net 31 by using predetermined values obtained by actually measuring predetermined information of the bottom net 31. Specifically, for example, the net information acquisition unit 19 acquires angle information detected by an angle sensor (not shown), the net state specifying unit 2122 calculates the angle, and the opening angle of the rope 32 of the bottom net 31 ( For example, the opening angle d1 of the planar view shape in the initial state shown in FIG. 3 and the opening angle d2 of the planar view shape after starting fishing are detected. Based on the opening angle (for example, the opening angle d1), the length direction size and the width direction size (for example, the width direction size L1 shown in FIG. 3) of the diagonal line of the rope 32 can be calculated. An opening width of 37 (for example, an opening width W1 shown in FIG. 3) can also be calculated.

  The <calculation method 3> may be configured to measure predetermined information of the bottom net 31 other than the opening angle (for example, the opening angle d1) of the rope 32. For example, the net information acquisition unit 19 determines the length of the diagonal line of the rope 32 in the longitudinal direction based on the detection result of the position of the rope 32 or the net body 33 by a position sensor (not shown) provided on the rope 32 or the net body 33. It may be configured to calculate the sheath width size (for example, width direction size L1) and the opening width (for example, opening width W1) of the opening 37 of the net body 33.

<Calculation method 4 / Calculation based on measurement information of external factors>
The shape change specifying unit 212 measures information on external factors that exist around the ship 10B and directly or indirectly affect fishing when performing the above <Calculation Method 3>. The result is used to specify the shape of the bottom net 31 and the like. Specifically, for example, the tidal current information acquisition unit 20 detects the direction and speed of the tidal current around the ship 10B, and the tidal current specifying unit 2123 calculates the direction and speed of the tidal current from the detection result. This tidal current information is used as a factor for specifying the distortion of the shape of the rope 32 and the net body 33 and the displacement of the position.

  The <calculation method 4> may be configured to use information about external factors other than tidal current information to specify the shape of the bottom net 31. For example, as a configuration for detecting external requirements, an anemometer and a thermometer are provided in place of the tidal current information acquisition unit 20, the direction and speed of the wind around the ship 10B, or the temperature are detected, and the detected information is It may be used to determine the degree of distortion of the shape of the rope 32 or the net body 33.

<Calculation method 5 and others>
The shape change specifying unit 212 may use the above <Calculation method 1> or <Calculation method 3> alone when performing the procedure of [Processing procedure 3], or <Calculation method 2> or <Calculation method 4>> May be used in combination. Further, a plurality of calculation methods may be used in combination, such as a combination of <calculation method 1> and <calculation method 3>.

[Processing Procedure 4-Image Display (1)]
The image forming unit 213 forms an image for specifying the shape of the bottom net 31 based on the information set and specified by the shape setting unit 211 and the shape change specifying unit 212. The image of the bottom net 31 is temporarily recorded in the graphic memory 22 and then displayed on the display 23A of the display unit 23.

Before starting fishing, as shown in FIG. 2A, the rope 32 and the net body 33 are installed in the initial state on the display 23A of the display unit 23 (that is, the plan view shape of the rope 32 is specified). An image of the bottom net 31 formed in the shape of After starting the fishing, the image of the dragnet 31 displayed on the display 23A is the shape of the dragnet 31 ₁ rope 32 of Figure 3, Yuku gradually changes to the shape of the dragnet 31 ₂ rope 32 in FIG . Accordingly, as shown in FIG. 2B, images of the bottom net 31 in which the shapes of the rope 32 and the net body 33 change with time are sequentially displayed on the display 23 </ b> A of the display unit 23.

[Procedure 5-Image display (2)]
In the above [Processing Procedure 4], when the image of the bottom net 31 is displayed on the display 23A of the display unit 23, the real-time shape image of the bottom net 31 and the signal supplied from the antenna 10 are displayed on the display 23A. Are displayed in a state of being merged with the video formed based on Specifically, as shown in FIG. 2A, the display 23A has an image of the bottom net 31 and a target 30 (for example, another ship, a buoy on the water, various underwater structures) existing around the ship 10B. Etc.) are displayed together.

  As a result, the boat operator can see the images and images displayed on the display 23 </ b> A while looking at the distance between the other target 30 and the bottom net 31 and the positional relationship with the target 30. Or the like (for example, whether or not there is a possibility that the target 30 and the bottom net 31 are in close contact with each other) can be determined by visual recognition.

  In this embodiment, the distance L3 between the ship 10B, the bottom net 31 and the target 30 in a state where the image and the image are displayed on the display 23A as shown in FIGS. 2A and 2B. Is controlled when the control unit 21 detects that it is closer than a preset limit distance (a predetermined distance that may cause the target 30 to come into contact with the ship 10B or the bottom net 31 if bottom net fishing is continued). The unit 21 may be configured to display a warning display on the display 23A to notify that the distance L3 to the target 30 is equal to or less than the limit distance.

[Processing procedure 6: Display of limit values]
When the vessel 10B continues towing the bottom net 31, the diagonal direction width of the rope 32 is reduced from the initial width direction size L 1 shown in FIG. 3 to the width direction size L 2 after the start of fishing. As a result, the opening 37 of the net body 33 is reduced from the opening width W1 in the initial state. Ultimately, the opening width W2 of the opening 37 after the start of fishing is proved as a limit value (hereinafter simply referred to as “limit value”) as a size in which the prey 34 cannot be driven into the net body 33. Same as in the above). Alternatively, the width direction size L2 after the start of fishing of the rope 32 is proved as a limit value (hereinafter also simply referred to as “limit value”) as a size at which the opening width W2 of the opening 37 of the net body 33 reaches the limit value. The same applies in this specification).

  In the image formed in the image forming unit 213, the shape change specifying unit 212 determines whether the opening width W2 of the opening 37 of the net body 33 has reached a limit value, or the width direction size L2 of the rope 32 is Detect whether the limit value has been reached. In addition, when the control part 21 is measuring the state of the net | network main body 33 or the rope 32 like said <calculation method 3> etc., for example, based on the result of this measurement, opening width W2 and width direction magnitude | size L2 It may be detected whether or not reaches a limit value.

  When it is determined that the size of the opening 37 of the net body 33 or the width of the rope 32 has reached the limit value as a result of detection by the shape change specifying unit 212, the control unit 21 determines that the limit value has been reached. Notify the operator. For example, under the control of the control unit 21, the image forming unit 213 notifies the ship operator that the opening width W2 or the width direction size L2 has reached the limit value (for example, “the opening width is the limit value, "Please pull it up." Alternatively, the image forming unit 213 changes the screen color to a color indicating a limit value. Alternatively, the control unit 21 notifies the operator that the limit value has been reached by a method other than image display (for example, by sounding a buzzer). Thereby, the boat operator pulls up the bottom net 31 from above the water 10B and takes out the prey 34 captured in the net body 33.

  When fishing is continuously performed after the above [Processing Procedure 6] is completed, the boat operator performs bottom net fishing while repeatedly performing the above [Processing Procedure 2] to [Processing Procedure 6].

  As described above, in this embodiment, after the specific shape of the rope 32 and the net body 33 formed by the initial arrangement of the bottom net 31 is displayed as an image, the bottom net when the bottom net 31 is screened by the ship 10B. The change of the shape from the initial state of 31 is identified, an image in which the real-time shape of the bottom net 31 can be visually recognized is formed, and the formed image is displayed on the display 23A of the display unit 23 to perform fishing. The state such as the shape of the bottom net 31 that sequentially changes in the water can be displayed on the display 23A of the display unit 23 provided in the ship 10B. Therefore, the state of the bottom net 31 under the water surface such as the position and shape of the bottom net 31 (for example, the opening state of the opening 37 of the net body 33 of the bottom net 31 and the opening state of the opening 37 of the net body 33 are changed. The state (such as the opening angle of the rope 32) can be visually recognized by the image of the bottom net 31 displayed on the display 23A of the display unit 23. As a result, the boat operator can appropriately recognize the underwater arrangement state of the bottom net 31 during fishing, and efficient fishing can be performed.

  In this embodiment, the shape of the rope 32 that affects the opening state of the opening 37 of the net body 33 is displayed by displaying the shape of the rope 32 of the bottom net 31 that changes over time on the display 23A of the display unit 23. Is displayed on the display 23A, and it is possible to make it easy for the operator to visually determine whether the bottom net 31 can continue fishing. Thereby, efficient fishing can be performed.

  In this embodiment, the state of the bottom net 31 whose shape changes with the navigation of the ship 10B during fishing is appropriately reflected in the image displayed on the display 23A of the display unit 23 and displayed. be able to. As a result, the boat operator can appropriately recognize the underwater arrangement state of the bottom net 31 during fishing, and efficient fishing can be performed.

  In this embodiment, depending on the navigation distance of the ship 10B, the shape of the bottom net 31 is specified by predicting a change in the shape of the bottom net 31 over time, so that the bottom net 31 is used during fishing. The change in the shape of the bottom net 31 can be accurately identified and displayed as an image based on the navigation distance of the ship 10B, which is the main factor affecting the shape of the ship.

  In this embodiment, when the change in the shape of the bottom net 31 is specified, information on the opening state of the opening 37 of the net body 33 which is a main factor for determining whether or not fishing can be continued is used. It is formed based on highly accurate information measured by the information acquisition unit 19 and the net state specifying unit 2122 and can be used to specify a change in the shape of the bottom net 31. As a result, it is possible to form and display an image that can accurately specify the change in the shape of the bottom net 31 and whether or not fishing can be continued, thereby enabling the vessel operator to perform efficient fishing.

  In this embodiment, when the change in the shape of the bottom net 31 is specified, the tidal current which is the main factor affecting the position and shape of the bottom net 31 detected by the tidal current information acquisition unit 20 and the tidal current specifying unit 2123 is detected. Information can be formed on the basis of measured high-accuracy information and used to identify changes in the shape of the bottom net 31. Thereby, the change in the shape of the bottom net 31 can be accurately specified and displayed as an image.

  In this embodiment, in fishing performed by towing the bottom net 31, changes in the shape of the bottom net 31 can be accurately identified and displayed as an image to allow the operator to perform efficient fishing.

  In this embodiment, the navigation distance of the ship 10B is formed based on the information acquired and detected by the position information acquisition unit 16, the direction information acquisition unit 17, the speed information acquisition unit 18, and the like. The distance to the specific target 30 (for example, a lighthouse or a predetermined buoy provided in water) is detected by other distance detection means, for example, the antenna 10, and the moving distance is specified based on the detection result. It may be configured to.

  In this embodiment, the image based on the signal supplied from the antenna 10 and the image of the bottom net 31 formed by the control of the control unit 21 are displayed on the display 23A. However, the present invention is not limited to this. The 31 image may be displayed on a display (not shown) different from the display 23 </ b> A that displays the video supplied from the antenna 10.

  In this embodiment, the image to be displayed on the display 23A of the display unit 23 is formed as a plan view shape of the bottom net 31. However, the present invention is not limited to this. For example, an image such as a perspective shape or a side view shape of the bottom net 31 is displayed. It may be configured to be formed and displayed on the display 23A, or may be configured to form a three-dimensional image of the bottom net 31 and display it on the display 23A.

  The above embodiment is an exemplification of the present invention, and it is needless to say that the present invention is not limited to the above embodiment.

10A: Image / video display device (fishnet shape display device)
10B ... Ship 16 ... Position information acquisition unit (navigation state specifying means)
17 ... Direction information acquisition unit (navigation state specifying means)
18 ... Speed information acquisition part (navigation state specifying means)
19: Network information acquisition unit (network status specifying means)
20 ... Tidal current information acquisition unit (tidal current identification means)
211 ... Shape setting section (shape setting means)
212 ... Shape change specifying part (shape change specifying means)
2121 ... Distance identification part (navigation state identification means)
2122... Network status specifying unit (network status specifying means)
2123 ... Tidal current identification part (tidal current identification means)
213... Image forming unit (image forming means)
23 ... Display section (display means)
31 ... Bottom net (fishing net)
32 ... rope 33 ... net body

Claims (7)

The fishing net that captures the prey in the net body changes over time by towing the net body that captures the prey in water and the rope that connects the net body and the ship with the ship, and changes over time during the towing. A shape display device for a fishing net that displays the shape,
Shape setting means for setting a specific shape formed by the initial arrangement of the fishing net as information for displaying the image when dropping the fishing net into the water;
A shape change specifying means for specifying a change in shape of the fishing net from the specific shape when the fishing net set by the shape setting means is hooked by the ship; and
An image that forms an image in which the shape of the fishing net in real time can be visually recognized based on the information on the specific shape of the fishing net and the information on the change in the shape, and displays the formed image on a display unit. A fishing net shape display device comprising a forming means.   2. The fishing net shape display device according to claim 1, wherein the image forming unit causes the display unit to display the shape of the rope of the fishing net that changes over time. 3. The shape change specifying means includes a navigation state specifying means for specifying a predetermined navigation state when the ship has navigated,
The shape change specifying means specifies the change in the shape of the fishing net depending on the information on the predetermined navigation state of the ship specified by the navigation state specifying means. The shape display apparatus of the fishing net of 2. The navigation state specifying means specifies a navigation distance of the ship,
The shape change specifying means specifies the shape of the fishing net by predicting a change in the shape of the fishing net over time depending on a navigation distance of the ship specified by the navigation state specifying means. The shape display device for a fishing net according to claim 3. The shape change specifying means includes a net state specifying means for specifying an opening state of the net body,
5. The shape change specifying unit uses information on an opening state of the net body specified by the net state specifying unit when specifying a change in the shape of the fishing net. The shape display apparatus of the fishing net as described in any one. The shape change specifying means includes tidal current specifying means for specifying a tidal current around the ship,
The shape change specifying means uses the information of the tidal current specified by the tidal current specifying means when specifying the change of the shape of the fishing net. The fishing net shape display device described.   7. The fishing net image display device according to claim 1, wherein the fishing net is a bottom net.

Images