Method, system and medium for measuring and correcting pipe thread pitch diameter based on image measurement
An image measurement and pipe thread technology, which is applied in the field of pipe thread pitch diameter measurement and correction, can solve the problems of influence of measurement accuracy, low measurement efficiency, complicated test device, etc., and achieve the effects of improving accuracy, improving real-time performance, and improving detection accuracy.
Active Publication Date: 2020-08-04
SHANGHAI JIAOTONG UNIV
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] In order to measure the diameter of the pipe thread, the traditional method is to use the contact method, the measurement efficiency is low, and the test device is complicated
However, the traditional vision-based thread pitch diameter measurement method does not consider the distortion effect of the thread lead angle on the image, which will affect the measurement accuracy.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0058] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0059] A method for measuring and correcting the pitch diameter of pipe threads based on image measurement according to the present invention includes:
[0060] Parameter setting step: setting the shape parameters of the thread;
[0061] Projection simulation step: according to the set thread shape parameters, simulate the measured projection view of the thread;
[0062] Error calculation step: calculate and obtain the measured pitch diameter and pitch diameter error according to the obtained shape par...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method, system and medium for measuring and correcting the pitch diameter of pipe threads based on image measurement, including: parameter setting step: setting the shape parameters of the thread; projection simulation step: simulating The measured projected view of the thread; the error calculation step: according to the obtained thread shape parameters and the measured projected view of the thread, calculate and obtain the measured pitch diameter and pitch diameter error; the error relationship establishment step: calculate the obtained measured pitch diameter and pitch diameter error The nonlinear regression analysis obtains the fitting function relationship between the measured pitch diameter and the pitch error; the error correction step: according to the obtained fitting function relationship between the measured pitch diameter and the pitch error, the error of the measured pitch diameter is eliminated. The invention makes full use of the observed median diameter value obtained from the existing image measurement, uses simulation regression analysis to correct the median diameter value, and improves the precision.
Description
technical field [0001] The invention relates to the field of image measurement, in particular to a method, system and medium for measuring and correcting the pitch diameter of pipe threads based on image measurement. Background technique [0002] In order to measure the pitch diameter of the pipe thread, the traditional method is to use the contact method, the measurement efficiency is low, and the test device is complicated. However, the traditional vision-based thread pitch diameter measurement method does not consider the distortion effect of the thread lead angle on the image, which will affect the measurement accuracy. [0003] Patent document CN109387172A (application number: 201810922008.1) discloses a threaded shaft measuring device including: a worktable, which supports the threaded shaft to be measured, and can adjust the rotation position around the vertical Z-axis, adjust the horizontal and intersecting with the Z-axis The rotational position of the X-axis, and ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/20G06T7/00G06T7/62G01B11/08
CPCG01B11/08G06F30/20
Inventor 吴江赵之谦李淋裴景玉
Owner SHANGHAI JIAOTONG UNIV