CN116105969A - Fish egg movement and flow field synchronous measurement test system based on image processing - Google Patents
Fish egg movement and flow field synchronous measurement test system based on image processing Download PDFInfo
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- CN116105969A CN116105969A CN202211666542.3A CN202211666542A CN116105969A CN 116105969 A CN116105969 A CN 116105969A CN 202211666542 A CN202211666542 A CN 202211666542A CN 116105969 A CN116105969 A CN 116105969A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/20—Analysis of motion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
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Abstract
The invention discloses a synchronous measurement test system for fish egg movement and flow field based on image processing, which relates to the technical field of synchronous measurement tests for fish egg movement and flow field. According to the method for measuring the flow velocity, the movement track and the flow field of the fish eggs synchronously, the movement velocity and the track of the fish eggs are measured at the same time when the flow field is measured, so that the influence of water flow on the movement of the fish eggs is more intuitively seen, the movement velocity, the movement track and the water flow condition around the fish eggs in the water body are obtained, and test support is provided for research on the movement rule of the fish eggs.
Description
Technical Field
The invention relates to the technical field of synchronous measurement tests of fish egg movement and flow fields, in particular to a synchronous measurement test system of fish egg movement and flow fields based on image processing.
Background
The fish roe is used as an early resource of fish, plays a very important role in fish protection, is generally divided into a viscous roe (Acipenser sinensis roe), a drifting roe (four big family roe) and the like, wherein the upstream of the Yangtze river is provided with more than 20 kinds of fishes which produce the drifting roe, and the incubation of the drifting roe is synchronously completed in drifting along with water, so that the movement of the roe in a water body directly influences the successful incubation of the fishes and the supplement of the fish resource, the transparent spherical life body with the grain size of the roe being 3 mm-7 mm is difficult to observe by naked eyes in the water body. The method is characterized in that the method comprises the steps of analyzing the correlation degree of the number of the fish eggs and environmental factors by using an environmental factor Pearson correlation method, supplementing the basic data of early fish resources in a specific area by using a large-scale plankton net fishing method, and verifying the water flow Reynolds number as a critical hydrodynamic condition of safe drifting of the fish eggs by using a large amount of outdoor water tank tests, wherein a large number of fish eggs are damaged and broken, are predated or are sinking to die during the period of thousands of kilometers along with water flow, and are in a starting stage at present in research of the fish eggs, for example, the relative motion law of the fish eggs and water flow when the fish eggs move in a water body is improved.
Disclosure of Invention
The invention provides a synchronous measurement test system for the movement of fish eggs and a flow field based on image processing, which aims to optimize the limitation of the conventional device on the measurement of the movement of the fish eggs.
In order to solve the technical problems, the invention adopts the following technical scheme:
the fish egg movement and flow field synchronous measurement test system based on image processing comprises a measurement system, wherein the measurement system comprises a fish egg movement measurement system, a flow field synchronous measurement test system and an image processing system, and the measurement system consists of a high-precision slope-changing water tank, a laser emitter, a high-speed CCD camera, a Nikon high-definition lens, a water level gauge, a synchronizer and an PIV flow field calculation program.
The technical scheme of the invention is further improved as follows: the full length of the high-precision variable-slope water tank is 28 m, the height is 0.7 m, the width is 0.56 m, the high-precision variable-slope water tank adopts a high-strength tank body structure, the boundary of the high-precision variable-slope water tank is adjustable, the integral precision of the high-precision variable-slope water tank reaches 0.2mm, the bottom of the high-precision variable-slope water tank is hinged with a bottom supporting seat, the inner wall of the bottom supporting seat is connected with a threaded rod in a threaded manner, the bottom of the threaded rod is fixedly connected with a motor, the threaded rod and the bottom supporting seat are used for carrying out gradient adjustment on the high-precision variable-slope water tank, the adjusting range of the high-precision variable-slope water tank is-0.1% -0.7%, and the gradient adjusting speed is 5.5mm/min.
The technical scheme of the invention is further improved as follows: the laser transmitter is a semiconductor continuous laser transmitter, the power of the semiconductor continuous laser transmitter is 8W, the laser wavelength is 532nm, the thickness of a sheet light source is 1mm, and the efficiency of the whole test system is improved by utilizing the arrangement of the semiconductor continuous laser transmitter.
The technical scheme of the invention is further improved as follows: the highest resolution of the high-speed CCD camera is 2560 multiplied by 1920pixels, the full-width frame frequency is 800Hz, the memory of the camera is 4.8G, the acquired image is in an 8-bit BMP format, the camera is communicated with a local area network constructed by adopting an Ethernet, image data transmission is realized, and the high-configuration setting of the high-speed CCD camera is utilized to ensure the accuracy and the comprehensiveness of data acquisition in the whole test.
The technical scheme of the invention is further improved as follows: the number of the water level meters is 7, the probes of the water level meters are all Swiss-Bay ultrasonic sensors, three-core copper core shielding wires are used for tight data transmission, and the stability of data transmission is improved.
The technical scheme of the invention is further improved as follows: the roe movement measurement system is used for measuring the speed of the roe particles, the roe particle speed measurement method is carried out by adopting a PTV particle tracking speed measurement technology, the roe particles are compiled through a MATLAB program, photographing is carried out when the roe particles move to a field of view of a camera, the photographing frequency can be adjusted according to water flow working conditions, generally 200 frames per second, the roe identification method adopts a digital mask method, and the gray value of the target particles is used as a discrimination standard.
The technical scheme of the invention is further improved as follows: the flow field synchronous measurement test system is used for carrying out a flow field synchronous measurement test, the flow field synchronous measurement test adopts the same method as fish egg identification, an original image is converted into a black-and-white image by using a gray level binarization method, trace particles in a water body can be white under the irradiation of laser, other areas are black, white trace particles of a front photograph and a rear photograph are connected end to end, and unidentified areas are interpolated to obtain flow field images of all the areas.
The technical scheme of the invention is further improved as follows: the image processing system comprises a roe particle track tracking method and a flow field characteristic acquisition method, wherein the specific method for tracking the roe particle track comprises the following steps: performing binarization processing on the image, dyeing the model roe by using a dark purple material, selecting a proper threshold value to identify and judge all areas of the image, setting all pixel points with gray values between the threshold value as roe particles, setting the other pixel points as backgrounds, reading coordinates of all the identified roe particles, judging pixels of all peripheral coordinate points, comparing the diameters of the peripheral pixel points with the roe particle size threshold value, judging the pixel diameters of the roe particles as roes if the pixel diameters of the roe pixels are between the threshold value, calculating coordinates of central points of all the identified roes, obtaining particles with highest matching probability relative to each roe particle in all possible roe particles according to a matching probability algorithm, continuously matching all the photos to obtain position coordinates of each roe particle, longitudinal speed along the water flow direction and vertical speed vertical to the water flow direction, connecting the coordinates of the central points of the same roe particle in each photo, and drawing a roe motion track graph.
The technical scheme of the invention is further improved as follows: the specific method for acquiring the flow field characteristics comprises the following steps: the mixed tracer particles in the water body are illuminated by laser, an instantaneous flow field diagram, the position coordinates and the longitudinal flow velocity of each point of the flow field and the vertical flow velocity perpendicular to the water flow direction are obtained by processing the tracer particles of all pictures, and the fish egg flow velocity is compared with the water flow velocity to obtain the fish egg following characteristic.
By adopting the technical scheme, compared with the prior art, the invention has the following technical progress:
1. the invention provides a synchronous measurement test system for the movement of a fish egg and a flow field based on image processing, which adopts a method for synchronously measuring the flow velocity, the movement track and the flow field of the fish egg, measures the movement velocity and the track of the fish egg simultaneously while measuring the flow field, and more intuitively sees the influence of water flow on the movement of the fish egg, thereby obtaining the movement velocity, the movement track and the water flow condition around the movement track of the fish egg in a water body and providing test support for researching the movement rule of the fish egg.
2. The invention provides a synchronous measurement test system for fish egg movement and flow field based on image processing, which is used for measuring the speed of fish egg particles by adopting a PTV particle tracking speed measuring technology and converting images by using a gray level binarization method to obtain clearer and comprehensive images, does not harm the fish egg particles, improves the protection capability of the fish eggs and improves the survival rate of the fish eggs.
3. The invention provides a fish egg movement and flow field synchronous measurement test system based on image processing, which utilizes the arrangement of a semiconductor continuous laser emitter to improve the efficiency of an overall test system and is matched with the characteristics of high efficiency and low energy consumption of the semiconductor continuous laser emitter to ensure the environment-friendly operation of the system, and further utilizes the high-configuration arrangement of a high-speed CCD camera to ensure the accuracy and the comprehensiveness of data acquisition during the overall test, thereby improving the test efficiency of the overall test system.
Drawings
FIG. 1 is a schematic diagram of a system of the present invention;
FIG. 2 is a graph showing the particle distribution of roe according to the present invention;
FIG. 3 is a system configuration diagram of the present invention;
FIG. 4 is a system test layout of the present invention.
Detailed Description
The invention is further illustrated by the following examples:
example 1
As shown in figures 1-4, the invention provides a fish egg movement and flow field synchronous measurement test system based on image processing, which comprises a measurement system, wherein the measurement system comprises a fish egg movement measurement system, a flow field synchronous measurement test system and an image processing system, the measurement system consists of a high-precision variable slope water tank, a laser emitter, a high-speed CCD camera, a Nikon high-definition lens, a water level gauge, a synchronizer and an PIV flow field calculation program, the high-precision variable slope water tank is 28 meters in total length, 0.7 meters in height and 0.56 meters in width, the high-precision variable slope water tank adopts a high-strength tank body structure, the boundary of the high-precision variable slope water tank is adjustable, the whole precision of the high-precision variable slope water tank reaches 0.2mm, the bottom of the high-precision variable slope water tank is hinged with a bottom supporting seat, the inner wall of the bottom supporting seat is connected with a threaded rod, the bottom of the threaded rod is fixedly connected with a motor, and the motor, the threaded rod and the bottom supporting seat are used for adjusting the gradient of the high-precision variable slope water tank, the high-precision slope-changing water tank has an adjusting range of-0.1% -0.7%, a slope adjusting speed of 5.5mm/min, a laser transmitter is a semiconductor continuous laser transmitter, the power of the semiconductor continuous laser transmitter is 8W, the laser wavelength is 532nm, the thickness of a sheet light source is 1mm, the highest resolution of a high-speed CCD camera is 2560×1920pixels, the full frame frequency is 800Hz, the memory of the camera is 4.8G, the acquired image is 8-bit BMP format, the camera communicates with a local area network constructed by adopting an Ethernet by a computer to realize image data transmission, the number of fluviographs is 7, probes of the fluviographs are all Swiss fort ultrasonic sensors, three-core copper-core shielding wires are adopted to carry out tight data transmission, the stability of data transmission is improved, the threaded rod is driven to rotate by an output shaft of a motor, the bottom supporting seat is lifted and adjusted under the action of the threaded rod, so as to ensure that the use gradient of the high-precision slope-changing water tank meets the overall test requirement.
Example 2
As shown in fig. 1-4, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the roe movement measurement system is used for measuring the speed of the roe particles, the roe particle speed measurement method is implemented by adopting a PTV particle tracking speed measurement technology, the method is compiled by adopting a MATLAB program, when the roe particles move to a field of view of a camera, shooting frequency can be adjusted according to water flow working conditions, generally 200 frames per second, the roe identification method is implemented by adopting a digital mask method, a flow field synchronous measurement test is implemented by adopting a flow field synchronous measurement test system according to a gray value of target particles as a discrimination standard, the flow field synchronous measurement test is implemented by adopting the same method as the roe identification, an original image is converted into a black-and-white image by adopting a gray level binarization method, trace particles in a water body can be white under the irradiation of laser, the rest areas are black, white trace particles of a front photograph and a rear photograph are connected end to end, unidentified areas are interpolated to obtain the field of the whole area, and the whole test process is clearer by utilizing the mutual cooperation of the PTV particle tracking speed measurement technology and the gray level binarization method, so that the protection capability of the roe and the survival rate of the roe are improved.
Example 3
As shown in fig. 1-4, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the image processing system comprises a roe particle track tracking method and a flow field characteristic acquisition method, wherein the specific method for tracking the roe particle track is as follows: performing binarization processing on the image, dyeing the model roe by adopting a dark purple material, selecting a proper threshold value to identify and judge all areas of the image, setting all pixel points with gray values between the threshold value as roe particles, setting other pixel points as backgrounds, reading coordinates of all the identified roe particles, judging pixels of all peripheral coordinate points, comparing the diameters of the peripheral pixel points with the threshold value of the roe particle size, judging the pixel diameters of the roe particles as the roe if the pixel diameters of the roe are between the threshold value, calculating coordinates of central points of all the identified roe particles, obtaining particles with highest matching probability relative to each roe particle in all possible roe particles according to a matching probability algorithm, continuously matching all the photos to obtain position coordinates of each roe particle, longitudinal speed along the water flow direction and vertical speed vertical to the water flow direction, connecting the coordinates of the central points of the same roe particle in each photo, and drawing a roe motion track map, wherein the flow field characteristics are obtained by the specific methods of: the mixed tracer particles in the water body are illuminated by laser, an instantaneous flow field diagram, the position coordinates and the longitudinal flow velocity of each point of the flow field and the vertical flow velocity perpendicular to the water flow direction are obtained through processing the tracer particles of all pictures, and the fish egg flow velocity is compared with the water flow velocity to obtain the fish egg following characteristic. The method for synchronously measuring the flow velocity, the movement track and the flow field of the fish eggs is used for measuring the flow field and simultaneously measuring the movement velocity and the track of the fish eggs, so that the influence of water flow on the movement of the fish eggs is intuitively seen.
The working principle of the image processing-based fish egg movement and flow field synchronous measurement test system is specifically described below.
When the test is carried out, as shown in fig. 1-4, firstly, a working frame of a PTV measuring system is built according to the size of a test water tank, the relative position of a platform in the frame is adjusted, each component of the PTV measuring system is conveniently installed, then, a test section of the indoor water tank is determined, the optimal shooting position is obtained according to the measurement statistics of the settling trend of fish eggs in the earlier stage, the PTV working frame is moved and fixed at the proper position of the test section, then, the PTV measuring system is assembled, a power supply of a high-speed camera, a laser emitter and a control computer is connected through a local area network, then, the height and the left and right positions of the laser emitter are adjusted, so that laser can enter a shooting area through a water surface light guide device, the laser meets the requirement in the shooting area, the brightness of the laser meets the requirement of the high-speed camera, then, the upper and lower positions and focal lengths of the high-speed camera are readjusted, the imaging plane of the camera coincides with the laser plane, the shooting capture water flow structure and the fish eggs movement track are conveniently shot, the image sampling frequency and the shooting time length are set, the test frame rate is 200 frames per second, the image is set, the image flow field is based on the camera memory is built, after the system is completed, the water flow field profile is stably is calculated, the image particle flow profile is obtained, the instant particle flow profile is obtained, and the image particle flow is obtained after the image is quantitatively, and the image particle flow is quantitatively obtained according to a flow field profile is obtained after a flow graph is obtained.
The foregoing invention has been generally described in great detail, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, it is intended to cover modifications or improvements within the spirit of the inventive concepts.
Claims (9)
1. An image processing-based fish egg movement and flow field synchronous measurement test system comprises a measurement system and is characterized in that: the measuring system comprises a fish egg movement measuring system, a flow field synchronous measuring test system and an image processing system, and consists of a high-precision slope-changing water tank, a laser transmitter, a high-speed CCD camera, a Nikon high-definition lens, a water level gauge, a synchronizer and a PIV flow field calculation program.
2. The image processing-based fish egg movement and flow field synchronous measurement test system as set forth in claim 1, wherein: the full length of the high-precision variable-slope water tank is 28 meters, the height is 0.7 meter, the width is 0.56 meter, the high-precision variable-slope water tank adopts a high-strength tank body structure, the boundary of the high-precision variable-slope water tank is adjustable, the integral precision of the high-precision variable-slope water tank reaches 0.2mm, the bottom of the high-precision variable-slope water tank is hinged with a bottom supporting seat, the inner wall of the bottom supporting seat is connected with a threaded rod in a threaded manner, the bottom of the threaded rod is fixedly connected with a motor, the adjusting range of the high-precision variable-slope water tank is-0.1% -0.7%, and the gradient adjusting speed is 5.5mm/min.
3. The image processing-based fish egg movement and flow field synchronous measurement test system as set forth in claim 1, wherein: the laser transmitter is a semiconductor continuous laser transmitter, the power of the semiconductor continuous laser transmitter is 8W, the laser wavelength is 532nm, and the thickness of the sheet light source is 1mm.
4. The image processing-based fish egg movement and flow field synchronous measurement test system as set forth in claim 1, wherein: the highest resolution of the high-speed CCD camera is 2560 multiplied by 1920pixels, the full frame frequency is 800Hz, the memory of the camera is 4.8G, the acquired image is in an 8-bit BMP format, and the camera is communicated with a local area network constructed by adopting an Ethernet through the computer, so that image data transmission is realized.
5. The image processing-based fish egg movement and flow field synchronous measurement test system as set forth in claim 1, wherein: the number of the water level meters is 7, all water level meter probes of the water level meters adopt Swiss Bay allied ultrasonic sensors, and three-core copper core shielding wires are used for tight data transmission.
6. The image processing-based fish egg movement and flow field synchronous measurement test system as set forth in claim 1, wherein: the roe movement measurement system is used for measuring the speed of the roe particles, the roe particle speed measurement method is carried out by adopting a PTV particle tracking speed measurement technology, the roe particles are compiled through a MATLAB program, photographing is carried out when the roe particles move to a field of view of a camera, the photographing frequency can be adjusted according to water flow working conditions, generally 200 frames per second, the roe identification method adopts a digital mask method, and the gray value of the target particles is used as a discrimination standard.
7. The image processing-based fish egg movement and flow field synchronous measurement test system as set forth in claim 1, wherein: the flow field synchronous measurement test system is used for carrying out a flow field synchronous measurement test, the flow field synchronous measurement test adopts the same method as fish egg identification, an original image is converted into a black-and-white image by using a gray level binarization method, trace particles in a water body can be white under the irradiation of laser, other areas are black, white trace particles of a front photograph and a rear photograph are connected end to end, and unidentified areas are interpolated to obtain flow field images of all the areas.
8. The image processing-based fish egg movement and flow field synchronous measurement test system as set forth in claim 1, wherein: the image processing system comprises a roe particle track tracking method and a flow field characteristic acquisition method, wherein the specific method of the roe particle track tracking method comprises the following steps: performing binarization processing on the image, dyeing the model roe by using a dark purple material, selecting a proper threshold value to identify and judge all areas of the image, setting all pixel points with gray values between the threshold value as roe particles, setting the other pixel points as backgrounds, reading coordinates of all the identified roe particles, judging pixels of all peripheral coordinate points, comparing the diameters of the peripheral pixel points with the roe particle size threshold value, judging the pixel diameters of the roe particles as roes if the pixel diameters of the roe pixels are between the threshold value, calculating coordinates of central points of all the identified roes, obtaining particles with highest matching probability relative to each roe particle in all possible roe particles according to a matching probability algorithm, continuously matching all the photos to obtain position coordinates of each roe particle, longitudinal speed along the water flow direction and vertical speed vertical to the water flow direction, connecting the coordinates of the central points of the same roe particle in each photo, and drawing a roe motion track graph.
9. The image processing-based fish egg movement and flow field synchronous measurement test system as set forth in claim 8, wherein: the specific method for acquiring the flow field characteristics comprises the following steps: the mixed tracer particles in the water body are illuminated by laser, an instantaneous flow field diagram, the position coordinates and the longitudinal flow velocity of each point of the flow field and the vertical flow velocity perpendicular to the water flow direction are obtained through processing the tracer particles of all pictures, and the fish egg flow velocity is compared with the water flow velocity to obtain the fish egg following characteristic.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117252121A (en) * | 2023-09-28 | 2023-12-19 | 中国水利水电科学研究院 | Fish egg drifting numerical simulation and verification method based on water flow Reynolds number |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117252121A (en) * | 2023-09-28 | 2023-12-19 | 中国水利水电科学研究院 | Fish egg drifting numerical simulation and verification method based on water flow Reynolds number |
| CN117252121B (en) * | 2023-09-28 | 2024-05-07 | 中国水利水电科学研究院 | Fish egg drifting numerical simulation and verification method based on water flow Reynolds number |
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