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Tubular level position precision measuring method based on image processing

A tube level and accuracy measurement technology, applied in the field of image processing, can solve problems such as incorrect calculation results, multiple judgment conditions, misjudgment of bubble contours, etc., and achieve fast and accurate calculation, fast detection speed, and good robustness

Active Publication Date: 2021-07-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the problem of too many distinguishing objects and too many judgment conditions, so that the bubble contour will be misjudged to a large extent, resulting in wrong calculation results

Method used

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  • Tubular level position precision measuring method based on image processing
  • Tubular level position precision measuring method based on image processing
  • Tubular level position precision measuring method based on image processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, see figure 1 , a method for measuring the position accuracy of a tube level based on image processing, which is implemented according to the following steps:

[0034] Step 1: Perform median filtering, fixed threshold and expansion processing on the original image captured by the camera, and find the pixel coordinate P of the right column of the left inner scale line on the tube level by means of pixel traversal l1 and the pixel coordinates P of the left column of the right inner tick mark r1 and the column pixel coordinate P of the middle point of the line width of the inner left tick mark CL and the column pixel coordinates P of the middle point of the line width of the inner right tick mark CR ;

[0035] Step 2: Find the row pixel coordinate value P of the top of the cylinder wall in the vial t ;

[0036] Step 3: Based on the pixel coordinates P of the right column of the left inner tick mark detected in the step 1 l1 and the pixel coordinates P...

Embodiment 2

[0041] This embodiment is basically the same as Embodiment 1, especially in that:

[0042] In this embodiment, the method for measuring the position accuracy of a tube vial based on image processing in Embodiment 1 is used to detect the product or component of the position accuracy of the level bar and the tube vial assembly through bubble reaction.

[0043] In this embodiment, the position accuracy of the detected product or component in the first embodiment of the method for measuring the position accuracy of a tube level based on image processing includes at least one of horizontal accuracy, vertical accuracy, 45-degree position accuracy, and position accuracy at any angle kind.

[0044] The method in this embodiment can detect horizontal accuracy, vertical accuracy, 45-degree position accuracy, and position accuracy at any angle, and can be used to detect products or components whose position accuracy is reflected by the level ruler and tube vial assembly through air bubbl...

Embodiment 3

[0046]This embodiment is basically the same as the previous embodiment, and the special features are:

[0047] In this example, if figure 1 As shown, the steps of the method for measuring the position accuracy of the tube level based on image processing are:

[0048] Step 1: Perform median filtering, fixed threshold and expansion processing on the original image captured by the camera, and find the pixel coordinate P of the right column of the left inner scale line on the tube level by means of pixel traversal l1 and the pixel coordinates P of the left column of the right inner tick mark r1 and the column pixel coordinate P of the middle point of the line width of the inner left tick mark CL and the column pixel coordinates P of the middle point of the line width of the inner right tick mark CR ;Such as image 3 marked as shown;

[0049] Perform median filtering on the original image (Src) to remove noise in the image, such as image 3 As shown, then perform a threshold ...

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Abstract

The invention discloses a tubular level position precision rapid measurement method based on an image processing technology. The method comprises steps of capturing an original image of a tubular level through a camera, carrying out image processing operation, and carrying out filtering, threshold processing and expansion operation of the image; searching inner side scale marks in the image, and cutting the whole image based on pixel coordinate values of the searched scale marks to obtain a required bubble image; contour extraction being carried out on the segmented bubble image, pixel coordinate values of a left end point and a right end point of the outer contour of the bubble being further found, a pixel value of bubble offset being calculated according to the pixel coordinate information of the left end point and the right end point of the bubble and the pixel coordinate information of the scale marks, and a position precision value of the tubular spirit level being finally calculated according to the pixel coordinate information of the left end point and the right end point of the bubble. The method can be used for detecting products or assemblies which reflect the position precision through bubbles, such as a leveling instrument and a tubular spirit level assembly, and can also be used for detecting horizontal precision, vertical precision, 45-degree position precision and position precision of any angle of the products or the assemblies.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a method for quickly measuring the position accuracy of a tube vial based on image processing technology. Background technique [0002] The position accuracy measurement of the tube level is mainly based on the offset of the bubble, which is mainly based on the principle of the liquid level. By judging the offset of the bubble relative to the left and right scale lines in the tube level, it is judged whether the measured object is level. . At present, the calibration of the spirit level mainly adopts the manual operation and the operation mode of aiming at the human eye. The main problems are low efficiency and large operation errors. The Chinese patent with publication number 108876860A discloses an image calibration method for the measurement of the bubble offset of the tube vial, which improves on the traditional calibration method, realizes automatic calibration, and converts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 郑华东喻轩俊张顺琦汪进超张齐桓王昭仪李世强
Owner SHANGHAI UNIV
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