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Method employing machine vision to measure workpiece circularity

A machine vision and roundness technology, applied in measurement devices, optical devices, instruments, etc., can solve problems such as difficulty in meeting large-scale measurements, high cost, time-consuming and labor-intensive, etc.

Inactive Publication Date: 2018-05-25
TIANJIN YUANZHUO AUTOMATION EQUIP MFG CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

Using this method is time-consuming and labor-intensive, and the cost is high, and it is difficult to meet the needs of mass measurement

Method used

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  • Method employing machine vision to measure workpiece circularity
  • Method employing machine vision to measure workpiece circularity
  • Method employing machine vision to measure workpiece circularity

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Embodiment Construction

[0015] The complete roundness measurement using machine vision includes step 1: photographing the original workpiece; step 2: processing the photographed image into a grayscale image; step 3: processing the grayscale image into a black and white image; step 4: correcting Data processing is performed on the black and white image to remove boundaries; step 5: remove noise; step 6: roundness calculation. The invention of the present invention lies in the step 4 in the foundation, which is to perform data processing on the black and white image, thereby removing the boundary.

[0016] A machine vision method for detecting the roundness of a round object, the method includes using a camera, placing the round object on a stage, using the camera to collect an image of the round object, and storing the image data in a In the memory of the processing system connected to the camera, the processing system processes the image and automatically calculates the circularity of the circular ob...

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Abstract

The invention relates to a machine vision method for detecting circularity of a circular object. The method comprises steps that a camera is employed, the circular object is disposed on an objective table, the camera is utilized to acquire images of the circular object, the image data is stored in a memory of a processing system connected with the camera, the images are processed by the processingsystem, and circularity of the circular object is automatically calculated. In the image processing process, a C-V processing model is utilized; and the C-V processing model comprises a three-dimensional C-V type function; parameters lambda1 and lambda2 are utilized and are limited in a range of 0.8-1.0 and a range of 0.75-1.0. The method is advantaged in that image differentiability especially of a circular object in the low contrast condition can be improved, and accuracy of circularity measurement is guaranteed.

Description

technical field [0001] The invention relates to the field of machine vision measurement, and relates to using machine vision to measure parameters of workpieces. Background technique [0002] Most of the existing methods for measuring the roundness of a workpiece are to use a roundness measuring instrument, which is a length measuring tool for measuring roundness by using a rotary axis method. The roundness meter is divided into two types: sensor rotary type and table rotary type. During measurement, the DUT is installed concentrically with the precision shaft, which carries the inductive length sensor or the table for precise circular motion. The calculated results are output by the instrument's sensors, amplifiers, filters, etc. Using this method is time-consuming and labor-intensive, and the cost is high, and it is difficult to meet the needs of mass measurement. Machine vision technology uses photographing instruments to obtain data, with fast measurement speed and lo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/2408
Inventor 王斌徐晓轩赖翔
Owner TIANJIN YUANZHUO AUTOMATION EQUIP MFG CO LTD