Portable measuring device for accurately collecting fish body characters and measuring method thereof

Abstract

The invention discloses a portable measuring device for accurately collecting fish body characters and a measuring method of the portable measuring device, and belongs to the field of aquatic product measuring equipment. The device comprises a rack, and a weighing mechanism, a body surface acquisition mechanism, an image calibration surface adjusting mechanism and a control mechanism which are arranged on the rack. The weighing mechanism obtains the weight of the fish body; the body surface acquisition mechanism is used for acquiring a side image and body thickness data of a fish body; the image calibration surface adjusting mechanism is used for adjusting the calibration surface of the fish body image; the control mechanism is used for processing and recording the collected data. According to the measuring method disclosed by the invention, the body thickness of the fish body is measured firstly, and the image calibration surface is adjusted in time according to the body thickness data to obtain the fish body side image based on the image calibration surface, so that accurate fish body character data can be quickly obtained, and a later data calibration step is avoided. The device is compact in structure, convenient to move, high in adaptability and suitable for application scenes such as farm field detection and breeding population evaluation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aquatic measuring equipment, and in particular to a portable measuring device for accurate collection of fish body traits and a measuring method thereof, which is suitable for fish breeding, germplasm evaluation and aquatic breeding information collection and the like. BACKGROUND

[0002] In the process of aquatic breeding and germplasm resource evaluation, the shape traits such as fish body length, body height and body thickness are important indicators reflecting the fish individual body shape, growth rate and genetic difference. The traditional manual measurement needs to contact the aquatic living body for multiple times, which is not only low in efficiency, but also easily affected by the experience of the operator and the struggle of the fish body, resulting in large measurement error. In large-scale sample measurement tasks, the manual method is difficult to meet the data volume measurement requirements.

[0003] With the development of imaging technology, the fish body automatic measurement method based on image recognition has gradually attracted attention. The existing fish body measuring device is mostly of fixed structure, large in size, complex in structure and poor in portability, and is difficult to use in breeding sites or outdoor environments. At the same time, the pixel calibration method of the existing fish body measuring device is mostly based on a single plane, without considering the measurement error caused by the change of fish body thickness, resulting in insufficient accuracy of the obtained fish body length, body height and other trait data. Some pixel calibration methods use high and low two scales, which need to obtain the linear equation of pixel distance and height, and then correct the collected image data, still having the problems of measurement deviation and complex calculation. Some existing devices use binocular vision, depth measurement or laser scanning to realize measurement, but the device is usually complex in structure, large in size and has many limitations on the use scene, which is difficult to meet the portable use demand in breeding sites.

[0004] Therefore, the existing fish body shape measuring device and method still have obvious deficiencies. The present application is created on this basis, and provides a new portable measuring device for accurate collection of fish body traits and a measuring method thereof, which can quickly adjust the image calibration plane based on the fish body thickness data, obtain the fish body image based on the image calibration plane, provide favorable conditions for accurate collection of fish body trait data, improve the measurement accuracy, and can complete the image collection and weight and body thickness data measurement at the same time, so as to meet the measurement requirements of different fish species. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a portable measuring device for accurate collection of fish body traits, which can quickly adjust the image calibration plane based on the fish body thickness data, obtain the fish body image based on the image calibration plane, provide favorable conditions for accurate collection of fish body trait data, improve the measurement accuracy, and can complete the image collection and weight and body thickness data measurement at the same time, so as to meet the measurement requirements of different fish species, thereby overcoming the deficiencies of the existing fish body trait measuring equipment.

[0006] To solve the above technical problems, the application provides a portable measuring device for accurate collection of fish body traits, comprising a rack and a weighing mechanism, a body surface collection mechanism, an image calibration surface adjusting mechanism and a control mechanism arranged on the rack,

[0007] The rack comprises a base, a vertical support rod and a horizontal support rod, the vertical support rod is arranged at the rear end of the base, and the horizontal support rod is movably arranged on the vertical support rod;

[0008] The weighing mechanism is arranged on the upper part of the base and comprises a weighing disc for placing a fish body and a gravity sensor arranged at the lower part of the weighing disc, for collecting fish body weight data;

[0009] The body surface collection mechanism comprises a camera and a laser distance sensor arranged on the horizontal support rod, the camera is arranged above the weighing disc and is used for collecting a side image of the fish body, and the laser distance sensor is arranged beside the camera and is used for measuring the distance difference from the upper surface of the weighing disc to the highest point of the surface of the fish body to obtain fish body thickness data;

[0010] The image calibration surface adjusting mechanism comprises an adjusting frame and a calibration adjusting plate movably connected with the adjusting frame, the adjusting frame comprises two vertical support plates arranged vertically on both sides of the base, two vertical grooves are respectively arranged on the two vertical support plates, the calibration adjusting plate can slide up and down along the vertical grooves and is fixed, the upper end surface of the calibration adjusting plate is provided with a calibration scale, the side surface of the vertical support plate is provided with an adjusting scale, the adjusting scale is used for controlling the distance of the calibration scale from the upper surface of the weighing disc, and the calibration scale is used for determining the image calibration surface;

[0011] The control mechanism is used for controlling and processing the data and images collected by the weighing mechanism and the body surface collection mechanism to obtain fish body trait measurement results.

[0012] Further improvement, the vertical support rod comprises a first support rod and a second support rod, the first support rod and the second support rod are respectively arranged at the rear part of the base, the horizontal support rod comprises a first cross beam, a second cross beam and a third cross beam, the first cross beam and the second cross beam are respectively arranged symmetrically on the first support rod and the second support rod, the third cross beam is arranged between the first cross beam and the second cross beam, and the camera and the laser distance sensor are fixed on the third cross beam.

[0013] Further improvement, the inner side of the first support rod and the second support rod is provided with a sliding groove, the end of the first cross beam and the second cross beam is provided with a sliding block and a fixing piece extending into the sliding groove, the fixing piece can fix the sliding block at any position of the sliding groove, realizing the up and down adjustment of the first cross beam and the second cross beam along the first support rod and the second support rod; the opposite inner side of the first cross beam and the second cross beam is respectively provided with a sliding long slot, the two ends of the third cross beam are respectively provided with a sliding piece extending into the sliding long slot, so that the third cross beam slides horizontally along the first cross beam and the second cross beam, realizing the horizontal adjustment of the third cross beam.

[0014] Further improvement, the transverse support rod is further provided with a light supplementing lamp mechanism, the light supplementing lamp mechanism comprises a clamp, an adjusting support and a light supplementing lamp connected in sequence, the clamp is clamped on the first cross beam or the second cross beam, the adjusting support is used for adjusting the irradiation angle of the light supplementing lamp, and the light supplementing lamp provides illumination for the fish body surface collection area.

[0015] Further improvement, the weighing disc adopts a transparent weighing disc, and the gravity sensors include four, which are symmetrically arranged below the transparent weighing disc.

[0016] Further improvement, the periphery below the transparent weighing disc is further provided with a back light bar, which is used for providing a transmission light source for image collection of the camera.

[0017] Further improvement, the vertical support rod is provided with an operation switch connected with the control mechanism, and the bottom of the base is provided with a rolling wheel facilitating movement.

[0018] Further improvement, the control mechanism comprises a data acquisition module, a pixel calibration module and an image processing module, the data acquisition module is used for receiving data and images collected by the weighing mechanism and the body surface collection mechanism, and transmitting the data and images to the pixel calibration module and the image processing module;

[0019] The pixel calibration module is used for calculating a calibration distance pixel value in an image collected by the camera according to the image containing a calibration scale.

[0020] The image processing module is used for corresponding the fish body side image collected by the camera with a standard measurement template, and measuring and calculating calibration data of a fish body full length, a body length, a head length, a snout length, an eye diameter, a postocular head length, a body height, a preanal body length, a caudal peduncle length and a caudal peduncle height according to the determined calibration distance pixel value.

[0021] As another improvement of the present application, the present application further provides a measurement method for accurate collection of fish body traits. The measurement method is realized by using the above-mentioned portable measurement device for accurate collection of fish body traits, and specifically comprises the following steps:

[0022] (1) Weight acquisition: The fish is placed on its side on the weighing pan and left to stand. The weight data of the fish is collected by the gravity sensor and transmitted to the control mechanism to obtain the weight data of the fish.

[0023] (2) Body thickness acquisition: Based on step (1), the laser distance sensor measures the height difference data between the fish body surface point and the weighing pan, and transmits it to the control mechanism to obtain the fish body thickness data;

[0024] (3) Image calibration surface adjustment: Based on the fish body thickness data obtained in step (2), adjust the position of the calibration adjustment plate according to the adjustment scale so that the calibration scale is located at 1 / 2 height of the fish body thickness data to form an image calibration surface.

[0025] (4) Pixel adjustment: Adjust the exposure, focal length and aperture parameters of the camera to make the calibration scale clear;

[0026] (5) Side image acquisition: Based on step (4), the camera is used to acquire a side image of the fish body based on the image calibration plane and transmit it to the control mechanism;

[0027] (6) Image processing steps: Based on the calibration distance of the calibration ruler in the side image of the fish, obtain the calibration distance pixel value of the image calibration surface; then calculate the fish body morphology data in the side image of the fish body based on the calibration distance pixel value to obtain the fish body morphology measurement data.

[0028] Further improvements include the step of introducing a standard measurement template in the image processing step (6), which is used to match the side view image of the fish with the standard measurement template. The standard measurement template includes multiple movable feature lines and feature points, which are used to accurately mark the starting points of the fish's total length, body length, head length, snout length, eye diameter, post-eye head length, body height, pre-anal body length, caudal peduncle length, and caudal peduncle height.

[0029] With this design, the present invention has at least the following advantages:

[0030] The portable measuring device for accurate fish body morphology acquisition of this invention uses a camera, a laser distance sensor, and an image calibration surface adjustment mechanism to adjust the image calibration surface in real time according to the fish body thickness data to obtain a suitable calibration distance pixel value, and finally obtain accurate fish body morphology data, overcoming the error between image pixels and actual size caused by different fish body thicknesses.

[0031] Furthermore, the weighing mechanism allows for the simultaneous collection of fish weight data.

[0032] It also provides favorable conditions for capturing clearer images of fish bodies through the supplementary lighting mechanism and backlight strip settings, and is especially suitable for capturing clear images of the fish's outer contours.

[0033] The device features a modular structure, making it easy to assemble, disassemble, and move. It is suitable for use in aquaculture sites or in the wild, and is applicable to fish breeding, germplasm assessment, and aquaculture information collection.

[0034] This invention provides a measurement method for accurately collecting fish body traits. By first measuring the fish's body thickness and then adjusting the image calibration plane based on the thickness data, a side view image of the fish based on the calibration plane is obtained. This allows for rapid and accurate acquisition of fish body trait data, avoiding the need for subsequent data calibration steps. Furthermore, the introduction of a standard measurement template facilitates accurate calibration of the starting point of the measured trait, providing favorable support for more accurate measurements. Attached Figure Description

[0035] The above is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 This is a front view of the structure of the portable measuring device for accurate collection of fish body characteristics according to the present invention.

[0037] Figure 2 This is a three-dimensional structural schematic diagram of the portable measuring device for accurate collection of fish body characteristics according to the present invention.

[0038] Figure 3 This is a structural block diagram of the control mechanism in the portable measuring device for accurate collection of fish body characteristics according to the present invention.

[0039] Figure 4 This is a flowchart of the measurement method for accurately collecting fish traits according to the present invention.

[0040] Figure 5 This is a schematic diagram of the standard measurement template in the measurement method for accurate collection of fish body traits according to the present invention. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Any equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are within the scope of protection of the present invention.

[0042] In this application, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may have other meanings besides indicating orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "set," "equipped," "fixed," etc., should be interpreted broadly. Those skilled in the art can understand the specific meaning of the aforementioned terms in this application according to the specific circumstances.

[0043] Reference Figure 1 and 2 As shown, this embodiment of the portable measuring device for accurate collection of fish body characteristics includes a frame 1 and a weighing mechanism 2, a body surface acquisition mechanism 3, an image calibration surface adjustment mechanism 4, and a control mechanism 5 mounted thereon.

[0044] The frame 1 includes a base 11, a vertical support rod 12, and a horizontal support rod 13. The vertical support rod 12 is located at the rear end of the base 11, and the horizontal support rod 13 is movably mounted on the vertical support rod 12. In this embodiment, both the vertical support rod 12 and the horizontal support rod 13 are made of aluminum profiles, which features lightweight, high strength, and modular assembly / disassembly.

[0045] The vertical support rod 12 includes a first support rod and a second support rod, which are respectively disposed at the rear of the base 21. The horizontal support rod 13 includes a first crossbeam, a second crossbeam and a third crossbeam, which are respectively symmetrically disposed on the first support rod and the second support rod, and the third crossbeam is disposed between the first crossbeam and the second crossbeam.

[0046] Specifically, the inner sides of the first and second support rods are provided with sliding grooves, and the ends of the first and second crossbeams are provided with sliding blocks and fixing members that extend into the sliding grooves. The fixing members can fix the sliding blocks at any position in the sliding grooves, realizing the up-and-down adjustment of the first and second crossbeams along the first and second support rods. The opposite inner surfaces of the first and second crossbeams are respectively provided with sliding elongated grooves, and the two ends of the third crossbeam are respectively provided with sliding members that extend into the sliding elongated grooves, allowing the third crossbeam to slide horizontally along the first and second crossbeams, realizing the horizontal adjustment of the third crossbeam.

[0047] The weighing mechanism 2 is located on the upper part of the base 11 and includes a weighing pan 21 for placing the fish and a gravity sensor 22 located below it for collecting fish weight data.

[0048] The surface acquisition mechanism 3 includes a camera 31 and a laser distance sensor 32 mounted on the third crossbeam. The camera 31 is positioned above the weighing pan 21 to acquire side images of the fish. The laser distance sensor 32 is positioned next to the camera 31 to measure the distance difference between the camera and the upper surface of the weighing pan 21 and between the camera and the highest point of the fish's surface, thus obtaining the fish's body thickness data. In other words, the camera 31 and the laser distance sensor 32 can be adjusted vertically and horizontally relative to the weighing pan 21 to adjust the shooting position for different fish sizes, achieving clear images of the fish.

[0049] The image calibration surface adjustment mechanism 4 described in this embodiment includes an adjustment frame 41 and a calibration adjustment plate 42 movably connected thereto. The adjustment frame 41 includes two vertical support plates 411 vertically arranged on both sides of the base 21, each with two opposing vertical grooves 412. The calibration adjustment plate 42 can slide up and down along the vertical grooves 412 and be fixed in place. A calibration scale 421 is provided on the upper surface of the calibration adjustment plate 42, and an adjustment scale 422 is provided on the side of the vertical support plate 12. The adjustment scale 422 is used to control the distance between the calibration scale 421 and the upper surface of the weighing pan 21, and the calibration scale 421 is used to determine the image calibration surface. If the adjustment scale 422 is set with the upper surface of the weighing pan 21 as scale 0, and scales are sequentially set upwards, the height of the calibration scale 421 can be easily adjusted. It should also be noted that the specific structure of the calibration adjustment plate described in this application, which can slide up and down and be fixed along the vertical groove, can be implemented using any existing structure, as shown in the attached figure. Figure 1 and 2 The bolt fixing shown can also be achieved by using a gear and rack mechanism or a threaded screw mechanism to move the structure up and down, or by using an electric method.

[0050] The control mechanism 5 is used to control and process the data and images collected by the weighing mechanism 2 and the body surface acquisition mechanism 3 to obtain the fish body morphology measurement results.

[0051] Furthermore, a supplementary lighting mechanism 6 is also provided on the transverse support rod 13. The supplementary lighting mechanism 6 includes a clamp 61, an adjusting bracket 62, and a supplementary light 63 connected in sequence. The clamp 61 is clamped on the first or second crossbeam, and the adjusting bracket 62 is used to adjust the illumination angle of the supplementary light 63. The supplementary light 63 provides illumination for the area on the fish body surface for sampling.

[0052] In this embodiment, the weighing pan 21 is a transparent weighing pan, and the gravity sensor 22 includes four sensors, which are symmetrically arranged below the transparent weighing pan to achieve steady-state acquisition of the fish's weight.

[0053] Preferably, a backlight strip 23 is provided around the lower perimeter of the transparent weighing pan to provide a transmitted light source for image acquisition by the camera 31, so as to obtain a clear and stable image of the fish, especially making the outer contour of the fish clearly visible.

[0054] Furthermore, the vertical support rod 12 is equipped with an operation switch 51 connected to the control mechanism 5 for convenient operation. The bottom of the base 21 is equipped with casters 24 for easy movement.

[0055] For a better option, see the appendix. Figure 3 As shown, the control mechanism 5 includes a data acquisition module 501, a pixel calibration module 502, and an image processing module 503.

[0056] The data acquisition module 501 is used to receive data and images collected by the weighing mechanism 2 and the body surface acquisition mechanism 3, and transmit them to the pixel calibration module 502 and the image processing module 503.

[0057] The pixel calibration module 502 is used to calculate the calibration distance pixel value in the image captured by the camera 31, which includes the calibration scale 421.

[0058] The image processing module 503 is used to match the side view image of the fish captured by the camera 31 with the standard measurement template, and measure and calculate the calibration data of the total length of the fish, body length, head length, snout length, eye diameter, post-eye head length, body height, pre-anal body length, caudal peduncle length, and caudal peduncle height according to the determined calibration distance pixel value.

[0059] Based on the above-mentioned measurement method using a portable measuring device for accurate collection of fish body traits, as shown in the appendix... Figure 4 As shown, the specific steps include the following:

[0060] S1. Light source adjustment: Turn on the power switch, fill light 63 and backlight strip 23, and adjust the adjustment bracket 62 to make the light in the collection area uniform.

[0061] S2. Weight acquisition: The fish is placed on its side on the weighing pan 21 and left to stand. The weight data of the fish is collected by the gravity sensor 22 and transmitted to the control mechanism 5 to obtain the weight data of the fish.

[0062] This step also includes a weight calibration step: first, the weighing system is zeroed, then a standard weight is placed in the center of the weighing pan 21, and the weight value is read by the control mechanism 5 and compared with the nominal value of the weight. If there is a deviation, the weighing system can be corrected until the readings match.

[0063] S3. Body thickness acquisition: Based on step S2, the laser distance sensor 32 measures the height difference data between the fish surface point and the weighing pan, and transmits it to the control mechanism 5 to obtain the fish body thickness data.

[0064] S4. Image calibration surface adjustment: Based on the fish body thickness data obtained in step S3, adjust the position of the calibration adjustment plate 42 according to the adjustment scale 422 so that the calibration scale 421 is located at 1 / 2 height of the fish body thickness data, forming an image calibration surface.

[0065] S5. Pixel Adjustment: Adjust the exposure, focal length, and aperture parameters of the camera 31 to make the calibration scale 421 clearly imaged.

[0066] S6. Side image acquisition: Based on step S5, the camera 31 is used to acquire a side image of the fish body based on the image calibration plane, and the image is transmitted to the control mechanism 5.

[0067] S7. Image Processing Steps: Based on the calibration distance of the calibration scale 421 in the side view image of the fish, the calibration distance pixel value of the image calibration surface is obtained, thus determining the number of pixels corresponding to a specified distance length in the image calibration surface at this height. Then, the fish body morphology data in the side view image is calculated based on the calibration distance pixel value to obtain the fish body morphology measurement data. For example, if the pixel value is 450 when the specified distance length in the image calibration surface is 200mm, the actual distance length corresponding to different pixel distances in the side view image of the fish can be calculated based on this calibration distance pixel value.

[0068] This step also includes introducing a standard measurement template to correlate the fish's side view image with the template. The standard measurement template includes multiple movable feature lines and feature points to accurately mark the starting points of the fish's total length, body length, head length, snout length, eye diameter, post-ocular head length, body depth, pre-anal body length, caudal peduncle length, and caudal peduncle depth, providing strong support for obtaining more accurate fish phenotypic data. The standard measurement template is a phenotypic measurement template designed according to the GB / T18654.3-2008 standard, as shown in the attached figure. Figure 5As shown in the figure, line g has two movable feature points m and n corresponding to the high and low points of the caudal peduncle, respectively. By dragging the feature line and feature points with the mouse to precisely fit the corresponding feature positions of the fish's side view image, multiple trait parameters such as the fish's total length ai, body length ah, head length ad, snout length ab, eye diameter bc, post-eye head length cd, body height aj, pre-anal body length ae, caudal peduncle length fh, and caudal peduncle height mn can be output.

[0069] In this measurement method, by adjusting the image calibration surface in a timely manner, the calibration scale can be fixed in the captured side image of the fish. By simply calculating the calibrated distance pixel value corresponding to the standard scale, the actual length value corresponding to each pixel distance in the side image of the fish can be accurately obtained. The method is simple, reliable, and requires no subsequent data calibration.

[0070] This invention provides a portable measuring device for accurate collection of fish body characteristics. Its small size and light weight facilitate rapid measurements in aquaculture workshops, experimental sites, or the field. The coordinated design of the image calibration surface adjustment mechanism and the body surface acquisition mechanism effectively addresses pixel deviations caused by fish thickness. The supplementary lighting mechanism and backlight strip allow for adjustment of the illumination angle to adapt to different ambient lighting conditions, providing favorable conditions for obtaining images with clear fish outlines.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A portable measuring device for accurately collecting fish body traits, characterized in that, It includes a frame and a weighing mechanism, a body surface acquisition mechanism, an image calibration surface adjustment mechanism, and a control mechanism mounted on it. The frame includes a base, a vertical support rod, and a horizontal support rod. The vertical support rod is located at the rear end of the base, and the horizontal support rod is movably mounted on the vertical support rod. The weighing mechanism is located on the upper part of the base and includes a weighing pan for placing the fish and a gravity sensor located at its lower part for collecting fish weight data. The body surface acquisition mechanism includes a camera and a laser distance sensor mounted on the horizontal support rod. The camera is mounted above the weighing pan and is used to acquire side images of the fish. The laser distance sensor is mounted next to the camera and is used to measure the distance difference between the laser and the upper surface of the weighing pan and between the laser and the highest point of the fish body surface to obtain the fish body thickness data. The image calibration surface adjustment mechanism includes an adjustment frame and a calibration adjustment plate movably connected thereto. The adjustment frame includes two vertical support plates vertically arranged on both sides of the base. Each of the two vertical support plates has two opposing vertical grooves. The calibration adjustment plate can slide up and down along the vertical grooves and be fixed. The upper end face of the calibration adjustment plate is provided with a calibration scale. The side face of the vertical support plate is provided with an adjustment scale. The adjustment scale is used to control the distance between the calibration scale and the upper surface of the weighing pan. The calibration scale is used to determine the image calibration surface. The control mechanism is used to control and process the data and images collected by the weighing mechanism and the body surface acquisition mechanism to obtain the fish body morphology measurement results.

2. The portable measuring device for accurate collection of fish body traits according to claim 1, characterized in that, The vertical support rod includes a first support rod and a second support rod, which are respectively disposed at the rear of the base. The horizontal support rod includes a first crossbeam, a second crossbeam, and a third crossbeam. The first crossbeam and the second crossbeam are respectively symmetrically disposed on the first support rod and the second support rod. The third crossbeam is disposed between the first crossbeam and the second crossbeam. The camera and the laser distance sensor are fixed on the third crossbeam.

3. The portable measuring device for accurate collection of fish body traits according to claim 2, characterized in that, The inner sides of the first and second support rods are provided with sliding grooves. The ends of the first and second crossbeams are provided with sliding blocks and fixing members that extend into the sliding grooves. The fixing members can fix the sliding blocks at any position in the sliding grooves, so as to realize the up and down adjustment of the first and second crossbeams along the first and second support rods. The opposite inner surfaces of the first and second crossbeams are respectively provided with sliding elongated grooves. The two ends of the third crossbeam are respectively provided with sliding members that extend into the sliding elongated grooves, so that the third crossbeam slides horizontally along the first and second crossbeams, thereby realizing the horizontal adjustment of the third crossbeam.

4. The portable measuring device for accurate collection of fish body traits according to claim 3, characterized in that, The transverse support rod is also equipped with a supplementary lighting mechanism, which includes a clamp, an adjustment bracket, and a supplementary light connected in sequence. The clamp is held on the first or second crossbeam, and the adjustment bracket is used to adjust the illumination angle of the supplementary light. The supplementary light provides illumination for the area on the fish body surface to be sampled.

5. The portable measuring device for accurate collection of fish body traits according to claim 4, characterized in that, The weighing pan is transparent, and the gravity sensor comprises four sensors, which are symmetrically arranged below the transparent weighing pan.

6. The portable measuring device for accurate collection of fish body traits according to claim 5, characterized in that, The transparent weighing pan is also equipped with a backlight strip around its lower perimeter to provide a transmitted light source for image acquisition by the camera.

7. The portable measuring device for accurate collection of fish body traits according to claim 6, characterized in that, The vertical support rod is equipped with an operating switch connected to the control mechanism, and the bottom of the base is equipped with rollers for easy movement.

8. The portable measuring device for accurately collecting fish body traits according to any one of claims 1 to 7, characterized in that, The control mechanism includes a data acquisition module, a pixel calibration module, and an image processing module. The data acquisition module is used to receive data and images collected by the weighing mechanism and the body surface acquisition mechanism, and transmit them to the pixel calibration module and the image processing module. The pixel calibration module is used to calculate the calibration distance pixel value in the image captured by the camera, which includes a calibration scale. The image processing module is used to match the side view image of the fish captured by the camera with a standard measurement template, and to measure and calculate the calibration data of the fish's total length, body length, head length, snout length, eye diameter, post-eye head length, body height, pre-anal body length, caudal peduncle length, and caudal peduncle height according to the determined calibration distance pixel values.

9. A measurement method for accurately collecting fish body traits, characterized in that, The measurement is performed using the portable measuring device for accurate collection of fish body traits as described in any one of claims 1 to 8, and the measurement method includes the following steps: (1) Weight acquisition: The fish is placed on its side on the weighing pan and left to stand. The weight data of the fish is collected by the gravity sensor and transmitted to the control mechanism to obtain the weight data of the fish. (2) Body thickness acquisition: Based on step (1), the laser distance sensor measures the height difference data between the fish body surface point and the weighing pan, and transmits it to the control mechanism to obtain the fish body thickness data; (3) Image calibration surface adjustment: Based on the fish body thickness data obtained in step (2), adjust the position of the calibration adjustment plate according to the adjustment scale so that the calibration scale is located at 1 / 2 height of the fish body thickness data to form an image calibration surface. (4) Pixel adjustment: Adjust the exposure, focal length and aperture parameters of the camera to make the calibration scale clear; (5) Side image acquisition: Based on step (4), the camera is used to acquire a side image of the fish body based on the image calibration plane and transmit it to the control mechanism; (6) Image processing steps: Based on the calibration distance of the calibration ruler in the side image of the fish, obtain the calibration distance pixel value of the image calibration surface; then calculate the fish body morphology data in the side image of the fish body based on the calibration distance pixel value to obtain the fish body morphology measurement data.

10. The measurement method for accurately collecting fish body traits according to claim 9, characterized in that, The image processing step (6) also includes the step of introducing a standard measurement template, which is used to match the side view image of the fish with the standard measurement template. The standard measurement template includes multiple movable feature lines and feature points, which are used to accurately mark the starting points of the fish's total length, body length, head length, snout length, eye diameter, post-eye head length, body height, pre-anal body length, caudal peduncle length, and caudal peduncle height.

Images