Device and method for determining midline equation of fish in motion

A line equation and fish body technology, applied in the field of technical measurement, can solve problems such as inconspicuous color difference, fish body outline deviates from the real situation, and no more effective method has been found, so as to achieve a clear shooting effect

Inactive Publication Date: 2018-01-12
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing methods for determining the outline of fish in motion, such as dilation and erosion algorithms, use the color difference between the color of the fish and the color of the water next to it to generate the outline through software, but the color difference is not obvious

Method used

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  • Device and method for determining midline equation of fish in motion
  • Device and method for determining midline equation of fish in motion
  • Device and method for determining midline equation of fish in motion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 , a device for determining the midline equation of a fish body in motion, which includes a base 1, a bottom support sleeve 2 is fixedly installed on the base 1, and a vertical telescopic sleeve is installed inside the bottom support sleeve 2 through a first bolt 3. Rod 4, the first crossbar 6 and the second crossbar 11 are welded vertically on the vertical telescopic rod 4, the horizontal telescopic rod 7 is set inside the first crossbar 6 through the second bolt 5, and the horizontal telescopic rod The end of 7 is fixed with support plate 8, and the top of described support plate 8 is fixedly installed with camera clip 9, and the end of second cross bar 11 is fixed with camera light source 10, and the detachable installation on described camera clip 9 There are video cameras.

[0035] Further, the camera adopts a high-definition camera, and the base 1 is fixedly installed on the side of the fish pond.

Embodiment 2

[0037] The method for determining the midline equation of a fish body in motion by any device includes the following steps:

[0038] Step 1, install the camera on the camera fixing clip 9 on the support plate 8, then place the whole device on the side of the fish pond, start the camera and take a video of the movement of the fish;

[0039] Step 2, choose a clear picture of a fish in motion in the fish motion video;

[0040] Step 3, find the outline coordinates of the fish body picture in the second step through DigitizeXY3.3;

[0041] Step 4, copy the coordinate points obtained in step 3 to excel, and use the coordinate command (a1&", "&b1) to generate coordinates (x, y), and generate a comparison curve between the fitting curve and the original data;

[0042] Step 5, open CAD, import the (x, y) fish outline in step 4, and draw a spline curve;

[0043] Step 6, import the fish outline spline curve in dwg format drawn in step 5 into NX10.0, and generate the mid-surface through...

Embodiment 3

[0048] Take one of the fish bodies as an example, combined with the attached Figure 1-8 To illustrate.

[0049] 1. use figure 2 The device takes a video of the fish's movement, and chooses a clear picture of the moving fish in which more parts of the fish are captured;

[0050] 2. Use DigitizeXY3.3 to find the fish outline coordinates, and the selected points should not be too sparse, such as image 3 ;

[0051] 3. Copy the coordinates of the points obtained in step 2 into excel, and use the coordinate command (a1&", "&b1) to generate coordinates (x, y), and generate a comparison curve between the fitting curve and the original data, such as Figure 4 Only the comparison curve of the left contour line of the fish body is shown;

[0052] 4. Since NX10.0 cannot directly import point coordinates to generate polylines, it is imported into NX after drawing with CAD. Open CAD, draw a spline curve, and import the coordinates (x, y) in step 2 to get the outline of the fish body...

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Abstract

The invention discloses a device and method for determining the midline equation of a fish in motion. The device comprises a base. A bottom support sleeve is fixedly mounted on the base, a vertical telescopic rod is installed inside the bottom support sleeve through a first bolt, a fist horizontal rod and a second horizontal rod are vertically welded on the vertical telescopic rod, a horizontal telescopic rod is mounted inside the first transverse rod in a sleeveing mode through a second bolt, a support plate is fixed at the end of the horizontal telescopic rod, a camera fixing clamp is fixedly arranged on the top of the support plate, a camera light source is fixedly mounted at the end of the camera fixing clamp, and a camera is detachably mounted on the camera fixing clamp. The midline coordinates and the midline equation can be used to explore the relationship between the longitudinal and transverse velocities, pressures, vortices and so on at the body profile of a fish and the swinging angle and the amplitude of the fish body so as to provide a new idea and method for aquatic creature researchers, especially fish researchers.

Description

technical field [0001] The invention relates to the field of technical measurement, in particular to a device for determining the midline equation of a fish in motion. Background technique [0002] Existing methods for determining the contour line of a moving fish, such as dilation and erosion algorithms, use the color difference between the color of the fish body and the color of the adjacent water body to generate the contour through software. However, due to external conditions such as the water body environment, the color difference is not obvious, and the captured fish body contour It often deviates from the real situation, which is also its current drawback. In conclusion, no effective method has been found in the existing methods for determining the midline equation of fish in motion. [0003] Therefore, it is necessary to design a method for determining the midline coordinates and equations of fish in motion. Contents of the invention [0004] The technical probl...

Claims

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Application Information

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IPC IPC(8): G01B11/24G06F17/50
Inventor 洪亮胡晓石小涛余英俊张永年陶林吴睿刘超群李晓宝
Owner CHINA THREE GORGES UNIV
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