A fish non-destructive sampling and measurement device and method based on machine vision

Abstract

The present invention discloses a non-destructive fish sampling and measurement device and method based on machine vision, relating to the field of fish sampling technology. The measurement device includes a collection chamber, an induction component, and a camera. A support frame is installed at the inlet of the collection chamber, and the outlet of the collection chamber is connected to a large measurement chamber. The side walls of the collection chamber are connected to the inlets of small and medium-sized measurement chambers. The collection chamber and the small to large measurement chambers are all equipped with an induction component, a camera, and a proximity switch, and an LED fill light matrix light is provided at the outlet. The camera, proximity switch, and LED fill light matrix light are all electrically connected to a computer on the water surface. The measurement method includes attracting, classifying and guiding, controlling the number, measuring, operating an image acquisition device, outputting images, and processing images. The present invention utilizes the phototaxis of fish to achieve fish attracting, guides fish by dissolved oxygen concentration, flow direction, and successively increasing light intensity, and achieves non-destructive fish sampling and measurement through machine vision.

Description

Technical Field

[0001] The present invention relates to the technical field of fish sampling, and in particular to a non-destructive fish sampling and measuring device and method based on machine vision. Background Art

[0002] The study of fish diversity is of great significance for the rational development of fish resources and the protection of fish species diversity. my country's lakes and reservoirs are rich in resources, providing a variety of habitats for the growth and reproduction of fish. Sample collection is an important link in the investigation and research of fish community diversity in lakes and rivers. The main nets used in river fishing operations include: gill nets, hooks, cast nets, shrimp cages, etc.

[0003] Currently, fish sampling typically involves trawl detection, a combination of sonar and nets, and a combination of cameras and nets to measure the species and size of fish. However, the mesh of the trawl can easily trap fish, causing damage to them during the sampling process. Even using a trawl with a smaller mesh size still cannot meet the requirements for fish sampling operations, as the trawl is made of a flexible material, making it difficult to partition the trawl and stably connect the sampling device, hindering the operation of the sampling device.

[0004] How to develop a non-destructive sampling and measurement device and method for fish based on machine vision, utilize the phototaxis of fish, dissolved oxygen concentration and flow direction to attract and guide fish, and realize non-destructive sampling and measurement of fish through machine vision devices, has become a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the Invention

[0005] The purpose of the present invention is to provide a steel column installation and positioning device to solve the problems listed in the background technology.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a non-destructive fish sampling and measuring device based on machine vision, comprising a collecting chamber, an induction component and a camera, wherein a support frame is installed at the inlet of the collecting chamber, the middle outlet of the collecting chamber is connected to the large measuring chamber, and the outlets on the side walls of the collecting chamber are respectively connected to the inlets of the small measuring chamber and the medium measuring chamber; the induction component is provided in the collecting chamber, the small measuring chamber, the medium measuring chamber and the large measuring chamber, and the outlets of the collecting chamber, the small measuring chamber, the medium measuring chamber and the large measuring chamber are all provided with LED fill light matrix lights; multiple groups of the cameras are respectively installed on the inner side walls at the ends of the small measuring chamber, the medium measuring chamber and the large measuring chamber, and the inner side walls of the small measuring chamber, the medium measuring chamber and the large measuring chamber are further installed with proximity switches, and the proximity switches are located in front of the cameras near the inlet side; the cameras, the proximity switches and the LED fill light matrix lights are all electrically connected to a computer for data control and processing;

[0008] It also includes an oxygen main pipe and an oxygen branch pipe. The oxygen main pipe is installed at the inlet of the collection chamber, the air inlet of the oxygen branch pipe is connected to the oxygen main pipe, and the air outlet of the oxygen branch pipe is arranged opposite to the inlet of the small measuring chamber; the oxygen main pipe is connected to the oxygen generator on the water surface.

[0009] Preferably, the shape of the collecting chamber is a cone or a quadrangular pyramid.

[0010] Preferably, the support frame is circular or rectangular in shape.

[0011] Preferably, the induction component includes a guide baffle, a guide mounting frame and an LED light strip, one end of the guide baffle is connected to the support frame, the other end of the guide baffle is connected to the guide mounting frame, and the LED light strip is installed on the guide mounting frame.

[0012] Preferably, the sizes of the guide baffles installed in the small measuring cavity, the medium measuring cavity and the large measuring cavity increase successively from the inlet side to the outlet side, and the sizes of the guide mounting frame and the LED light strip decrease successively from the inlet side to the outlet side.

[0013] Preferably, the bulbs of the LED light strip are all facing the inlet side, and the brightness of the LED light strip increases from the inlet side to the outlet side.

[0014] Preferably, the collection chamber, small measurement chamber, medium measurement chamber and large measurement chamber are all made of rubber, polyurethane, plastic or metal, and fine through holes are opened on the side walls of the collection chamber, small measurement chamber, medium measurement chamber and large measurement chamber.

[0015] Preferably, the camera is electrically connected to the computer via an image acquisition card, and the computer is installed with visual processing software.

[0016] A non-destructive sampling and measurement method for fish based on machine vision comprises the following steps:

[0017] Step 1: Attract fish by installing LED light strips on the guide mounting frame and using the fish's phototaxis to attract the fish into the collection chamber.

[0018] Step 2: Classification and guidance: An oxygen main pipe and an oxygen branch pipe are set in the collection chamber, and the outlet of the oxygen branch pipe is opposite to the inlet of the small measurement chamber. This allows small fish to enter the small measurement chamber along the flow direction of higher dissolved oxygen concentration, while larger fish enter the medium and large measurement chambers respectively, thus achieving fish classification and guidance;

[0019] Step 3: Control the number of fish to be tested. After the fish enter the small, medium, or large measurement chamber, they swim along the LED light strip on the induction component and the dissolved oxygen in the water. The size of the guide mounting frame decreases successively, so that fish of similar size pass through the rightmost induction component in turn.

[0020] Step 4: Send the measurement command, the fish swims out of the induction component, triggering the proximity switch, which sends a pulse signal to the computer;

[0021] Step 5: The image acquisition device works. The computer sends instructions to the camera and LED fill light matrix according to the pre-set program and delay. The LED fill light matrix starts to expose and the camera starts scanning.

[0022] Step 6: Image output: The camera will collect the digital signal and transmit it to the computer through the image acquisition card and store it in the computer memory;

[0023] Step 7: Image processing: The computer's visual processing software analyzes and identifies the digital signal fed back by the camera to obtain the fish species and length measurement results.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] The present invention discloses a non-destructive fish sampling and measurement device and method based on machine vision. The device utilizes the phototaxis of fish to attract fish, and guides fish in different zones through the concentration and flow direction of dissolved oxygen and the increasing light intensity. The device also realizes non-destructive sampling and measurement of fish through machine vision, and has simple operation and high sampling accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a front view schematic diagram of a non-destructive fish sampling and measurement device based on machine vision according to the present invention;

[0028] Figure 2 This is a schematic diagram on the left side of a non-destructive fish sampling and measurement device based on machine vision of the present invention (the shape of the collection chamber is conical);

[0029] Figure 3 This is a schematic diagram on the left side of a non-destructive fish sampling and measurement device based on machine vision of the present invention (the shape of the collection chamber is a quadrangular pyramid);

[0030] Figure 4 For the present invention Figure 1 Enlarged view of position A in the middle.

[0031] Explanation of the accompanying symbols: 1. Collection chamber; 2. Support frame; 3. Guide baffle; 4. Guide mounting frame; 5. LED light strip; 6. Oxygen main pipe; 7. Oxygen branch pipe; 8. Small measuring chamber; 9. Medium measuring chamber; 10. Large measuring chamber; 11. Camera; 12. Proximity switch; 13. LED fill light matrix lamp. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] like Figure 1-4 As shown, a non-destructive sampling and measuring device for fish based on machine vision includes a collecting chamber 1, an induction component and a camera 11. A support frame 2 is installed at the inlet of the collecting chamber 1. The middle outlet of the collecting chamber 1 is connected to a large measuring chamber 10. The outlets on the side walls of the collecting chamber 1 are connected to the inlets of the small measuring chamber 8 and the medium measuring chamber 9 respectively; the induction component is provided in the collecting chamber 1, the small measuring chamber 8, the medium measuring chamber 9 and the large measuring chamber 10. and the exit of the large measuring cavity 10 are provided with an LED fill light matrix lamp 13; multiple groups of cameras 11 are respectively installed on the inner side walls of the ends of the small measuring cavity 8, the medium measuring cavity 9 and the large measuring cavity 10, and the inner side walls of the small measuring cavity 8, the medium measuring cavity 9 and the large measuring cavity 10 are also installed with a proximity switch 12, which is located in front of the camera 11 near the entrance side; the camera 11, the proximity switch 12, and the LED fill light matrix lamp 13 are all electrically connected to a computer for data control and processing;

[0034] It also includes an oxygen main pipe 6 and an oxygen branch pipe 7, wherein the oxygen main pipe 6 is installed at the inlet of the collecting chamber 1, the air inlet of the oxygen branch pipe 7 is connected to the oxygen main pipe 6, and the air outlet of the oxygen branch pipe 7 is arranged opposite to the inlet of the small measuring chamber 8; the oxygen main pipe 6 is connected to the oxygen generator on the water surface, and the dissolved oxygen concentration in the collecting chamber is increased by the oxygen generator, and the dissolved oxygen flows to the inlets of the small, medium and large measuring chambers through the movement of the measuring device. Since the air outlet of the oxygen branch pipe is arranged opposite to the inlet of the small measuring chamber, the dissolved oxygen concentration at the inlet of the small measuring chamber is higher, and the dissolved oxygen concentration from the inlet of the medium measuring chamber to the large measuring chamber decreases successively, so that the fish enter the small to large measuring chambers according to their body size, thereby realizing the zoning measurement of the fish according to their body size.

[0035] Specifically, four cameras 11 are evenly distributed on the inner walls of the small measuring chamber, the medium measuring chamber and the large measuring chamber, which can achieve 360° scanning of fish and improve the scanning accuracy of the camera when multiple fish pass by the camera at the same time.

[0036] like Figure 2-3 The shape of the collecting chamber 1 is a cone or a quadrangular pyramid, which can guide the dissolved oxygen from the small measuring chamber inlet to the large measuring chamber inlet. The shape of the support frame 2 is a circle or a rectangle, which can effectively support the collecting chamber and ensure the opening of the collecting chamber inlet.

[0037] Specifically, the induction component includes a guide baffle 3, a guide mounting frame 4 and an LED light strip 5. One end of the guide baffle 3 is connected to the support frame 2, and the other end of the guide baffle 3 is connected to the guide mounting frame 4. The LED light strip 5 is installed on the guide mounting frame 4. The setting of the induction component can guide the fish and prevent the fish from swimming out of the collection chamber and the measuring chamber to affect the measurement accuracy.

[0038] Specifically, the sizes of the guide baffles 3 installed in the small measuring chamber 8, the medium measuring chamber 9 and the large measuring chamber 10 increase successively from the inlet side to the outlet side, and the sizes of the guide mounting frame 4 and the LED light strip 5 decrease successively from the inlet side to the outlet side, which can control the number of fish swimming to the camera, so that a smaller number or even a single fish passes the camera scanning measurement in turn, thereby ensuring the accuracy of fish sampling.

[0039] Specifically, the bulbs of the LED light strip 5 are all facing the inlet side, and the brightness of the LED light strip 5 increases from the inlet side to the outlet side, thereby achieving step-by-step attracting of fish and preventing fish from migrating and freeing from the inlet of the collection chamber.

[0040] Specifically, the materials of the collecting chamber 1, the small measuring chamber 8, the medium measuring chamber 9 and the large measuring chamber 10 are all made of rubber, polyurethane, plastic or metal, with rubber being preferred. Fine through holes are provided on the side walls of the collecting chamber 1, the small measuring chamber 8, the medium measuring chamber 9 and the large measuring chamber 10, which can prevent the mesh from causing damage to the fish, prevent smaller fish from freeing from the mesh, and reduce the resistance generated by the water flow when the sampling device is dragged in the water. Furthermore, the use of rubber material can ensure the cavity space of the collecting chamber 1, the small measuring chamber 8, the medium measuring chamber 9 and the large measuring chamber 10, avoid deformation of the cavity space caused by the influence of water flow, and facilitate the installation and carrying of cameras, proximity switches and induction components.

[0041] Specifically, the camera 11 is electrically connected to the computer through an image acquisition card. The computer is installed with visual processing software. The setting of the machine vision system can not only realize non-destructive measurement of fish, but also ensure measurement accuracy. It is simple to operate and does not require frequent net casting and recovery operations. It is convenient and fast, simple to operate, and has a high degree of automation.

[0042] Specifically, the measuring device is connected to the top through a towing cable, and a counterweight is set at the bottom of the measuring device. The measuring device is sunk into a predetermined water depth for measurement operations by adjusting the length of the towing cable entering the water, the towing speed, and the number of counterweights.

[0043] A non-destructive sampling and measurement method for fish based on machine vision comprises the following steps:

[0044] Step 1: Attract fish by installing LED light strips on the guide mounting frame and using the fish's phototaxis to attract the fish into the collection chamber.

[0045] Step 2: Classification and guidance: An oxygen main pipe and an oxygen branch pipe are set in the collection chamber, and the outlet of the oxygen branch pipe is opposite to the inlet of the small measurement chamber. This allows small fish to enter the small measurement chamber along the flow direction of higher dissolved oxygen concentration, while larger fish enter the medium and large measurement chambers respectively, thus achieving fish classification and guidance;

[0046] Step 3: Control the number of fish to be tested. After the fish enter the small, medium, or large measurement chamber, they swim along the LED light strip on the induction component and the dissolved oxygen in the water. The size of the guide mounting frame decreases successively, so that fish of similar size pass through the rightmost induction component in turn.

[0047] Step 4: Send the measurement command, the fish swims out of the induction component, triggering the proximity switch, which sends a pulse signal to the computer;

[0048] Step 5: The image acquisition device works. The computer sends instructions to the camera and LED fill light matrix according to the pre-set program and delay. The LED fill light matrix starts to expose and the camera starts scanning.

[0049] Step 6: Image output: The camera will collect the digital signal and transmit it to the computer through the image acquisition card and store it in the computer memory;

[0050] Step 7: Image processing: The computer's visual processing software analyzes and identifies the digital signal fed back by the camera to obtain the fish species and length measurement results.

[0051] Furthermore, the image processing in step seven is performed according to existing computer programs and will not be described in detail here.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0053] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A non-destructive fish sampling and measurement device based on machine vision, comprising a collection chamber (1), an induction component and a camera (11), characterized in that: A support frame (2) is installed at the inlet of the collecting chamber (1); the middle outlet of the collecting chamber (1) is connected to the large measuring chamber (10); the outlets on the side walls of the collecting chamber (1) are respectively connected to the inlets of the small measuring chamber (8) and the medium measuring chamber (9); the induction components are all provided in the collecting chamber (1), the small measuring chamber (8), the medium measuring chamber (9) and the large measuring chamber (10); LEDs are all provided at the outlets of the collecting chamber (1), the small measuring chamber (8), the medium measuring chamber (9) and the large measuring chamber (10). A fill light matrix lamp (13); a plurality of groups of cameras (11) are respectively installed on the inner side walls of the ends of the small measuring cavity (8), the medium measuring cavity (9) and the large measuring cavity (10); a proximity switch (12) is also installed on the inner side walls of the small measuring cavity (8), the medium measuring cavity (9) and the large measuring cavity (10), and the proximity switch (12) is located in front of the camera (11) near the inlet side; the camera (11), the proximity switch (12) and the LED fill light matrix lamp (13) are all electrically connected to a computer for data control processing; It also includes an oxygen main pipe (6) and an oxygen branch pipe (7), wherein the oxygen main pipe (6) is installed at the inlet of the collecting chamber (1), the air inlet of the oxygen branch pipe (7) is connected to the oxygen main pipe (6), and the air outlet of the oxygen branch pipe (7) is arranged opposite to the inlet of the small measuring chamber (8); the oxygen main pipe (6) is connected to the oxygen generator on the water surface; The induction component comprises a guide baffle (3), a guide mounting frame (4) and an LED light strip (5); one end of the guide baffle (3) is connected to the support frame (2), the other end of the guide baffle (3) is connected to the guide mounting frame (4), and the LED light strip (5) is mounted on the guide mounting frame (4); The sizes of the guide baffles (3) installed in the small-sized measuring cavity (8), the medium-sized measuring cavity (9), and the large-sized measuring cavity (10) increase sequentially from the inlet side to the outlet side, and the sizes of the guide mounting frame (4) and the LED light strip (5) decrease sequentially from the inlet side to the outlet side.

2. The fish non-destructive sampling and measuring device based on machine vision according to claim 1, characterized in that: The shape of the collecting chamber (1) is a cone or a quadrangular pyramid.

3. The fish non-destructive sampling and measuring device based on machine vision according to claim 2, characterized in that: The support frame (2) is circular or rectangular in shape.

4. The fish non-destructive sampling and measuring device based on machine vision according to claim 3 is characterized in that: The light bulbs of the LED light strip (5) are all oriented toward the inlet side, and the brightness of the LED light strip (5) increases sequentially from the inlet side to the outlet side.

5. The fish non-destructive sampling and measuring device based on machine vision according to claim 4 is characterized in that: The collecting chamber (1), the small measuring chamber (8), the medium measuring chamber (9) and the large measuring chamber (10) are all made of rubber, polyurethane, plastic or metal, and fine through holes are provided on the side walls of the collecting chamber (1), the small measuring chamber (8), the medium measuring chamber (9) and the large measuring chamber (10).

6. The non-destructive fish sampling and measuring device based on machine vision according to claim 5, characterized in that: The camera (11) is electrically connected to the computer via an image acquisition card, and the computer is installed with visual processing software.

7. A method for non-destructive sampling and measurement of fish based on machine vision, performed using the non-destructive sampling and measurement device for fish based on machine vision according to claim 6, characterized in that: The steps include: Step 1: Attract fish by installing LED light strips on the guide mounting frame and using the fish's phototaxis to attract the fish into the collection chamber. Step 2: Classification and guidance: An oxygen main pipe and an oxygen branch pipe are set in the collection chamber, and the outlet of the oxygen branch pipe is opposite to the inlet of the small measurement chamber. This allows small fish to enter the small measurement chamber along the flow direction of higher dissolved oxygen concentration, while larger fish enter the medium and large measurement chambers respectively, thus achieving fish classification and guidance; Step 3: Control the number of fish to be tested. After the fish enter the small, medium, or large measurement chamber, they swim along the LED light strip on the induction component and the dissolved oxygen in the water. The size of the guide mounting frame decreases successively, so that fish of similar size pass through the rightmost induction component in turn. Step 4: Send the measurement command, the fish swims out of the induction component, triggering the proximity switch, which sends a pulse signal to the computer; Step 5: The image acquisition device works. The computer sends instructions to the camera and LED fill light matrix according to the pre-set program and delay. The LED fill light matrix starts to expose and the camera starts scanning. Step 6: Image output: The camera will collect the digital signal and transmit it to the computer through the image acquisition card and store it in the computer memory; Step 7: Image processing: The computer's visual processing software analyzes and identifies the digital signal fed back by the camera to obtain the fish species and length measurement results.

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