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Measurement Method of Feature Size of Flexible Ring Parts Based on Machine Vision

A technology of ring parts and measurement methods, which is applied in the direction of measuring devices, instruments, and optical devices, can solve the problems of measurement errors and repeatability, and achieve low performance requirements, high measurement accuracy, and strong algorithm robustness Effect

Inactive Publication Date: 2018-11-02
NANJING UNIV OF SCI & TECH
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Problems solved by technology

This method can obtain high accuracy when measuring standard circular parts, but for the measurement of the characteristic dimensions of flexible parts such as sealing rings, the measurement error and repeatability are not ideal, the main reason is that the sealing ring profile is not a standard round

Method used

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  • Measurement Method of Feature Size of Flexible Ring Parts Based on Machine Vision
  • Measurement Method of Feature Size of Flexible Ring Parts Based on Machine Vision
  • Measurement Method of Feature Size of Flexible Ring Parts Based on Machine Vision

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] to combine Figure 1 to Figure 4 , a method for measuring the feature size of flexible ring parts based on machine vision, the steps are as follows:

[0037] Step 1, binary processing is carried out to the overall image of the flexible annular part (ie O-shaped sealing ring), the specific method is as follows:

[0038] Place the flexible ring part on the transparent glass platform, place the telecentric parallel light source under the transparent glass platform, place the camera directly above the flexible ring part, set the telecentric parallel light source, the flexible ring part and the camera coaxially, turn on the telecentric parallel The light source and the camera collect the overall image of the flexible ring part, and perform binary processing on the overall image of the flexible ring part. (like figure 2 (a) and figure 2 (b) shown).

[0039] Step 2. Perform denoising processing on the above image, extract the noise contour with the help of the idea of ​​...

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Abstract

The invention discloses a flexible ring-shaped workpiece feature size measuring method based on machine vision. The measuring method comprises the step 1: performing binarization processing on the integral image of a flexible ring-shaped workpiece; the step 2: performing de-noising processing on the image; the step 3: utilizing an area method to solve the internal diameter of the flexible ring-shaped workpiece for the de-noised image; and the step 4: utilizing a perpendicular bisector method to solve the diameter of section for the partial image of the flexible ring-shaped workpiece. The flexible ring-shaped workpiece feature size measuring method based on machine vision utilizes the area method and the perpendicular bisector method o realize micron order measurement of the internal diameter and the diameter of section for the flexible ring-shaped workpiece, and has the advantages of being high in repeatability, being high in the calculating speed, and being high in robustness.

Description

technical field [0001] The invention belongs to the field of digital image processing and machine vision, and in particular relates to a method for measuring the characteristic dimensions of flexible ring parts based on machine vision. Background technique [0002] The characteristic dimensions of flexible ring parts include inner diameter and section diameter. At present, the measurement methods of the size parameters of flexible ring parts can be divided into two categories: contact measurement and non-contact measurement. Commonly used traditional contact measurement methods include caliper measurement method, cone-rod measurement method, flexible ruler measurement method, modified dial indicator measurement method, etc.; non-contact measurement mainly uses large projectors, tool microscopes, section automatic measuring instruments and section slices projection etc. Due to the elasticity of the material of the flexible ring part, it will be deformed by contact measuremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/08G01B11/12
CPCG01B11/08G01B11/12
Inventor 何博侠童楷杰
Owner NANJING UNIV OF SCI & TECH
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