Method and system for detecting elliptical hole group based on maximum inscribed circle

A technology of maximum inscribed circle and detection method, applied in measuring devices, instruments, optical devices, etc., can solve the problems of low precision, high cost, large time consumption, etc., and achieve the effect of high precision and short time consumption

Active Publication Date: 2015-05-13
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0003] In order to solve the technical problems raised by the above-mentioned background technology, the present invention aims to provide a method and system for detecting elliptical...

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  • Method and system for detecting elliptical hole group based on maximum inscribed circle
  • Method and system for detecting elliptical hole group based on maximum inscribed circle
  • Method and system for detecting elliptical hole group based on maximum inscribed circle

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Embodiment Construction

[0029] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] Such as figure 1 The flowchart of the detection method of the present invention shown, a kind of elliptical hole group detection method based on the largest inscribed circle, comprises the following steps:

[0031] (1) Collect the workpiece image information.

[0032] (2) Perform image preprocessing on the collected image information. Due to the presence of noise in the image sampling process, this will cause certain errors in the accuracy and time-consuming of the later detection of the part image. Therefore, it is necessary to minimize the noise before performing relevant dimension measurements on the image sample of the hole set workpiece. In order to reduce the noise, the combination of median filtering method and morphological opening operation to remove small targets is adopted. Secondly, edge detection is performed on the ...

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Abstract

The invention discloses a method and a system for detecting an elliptical hole group based on a maximum inscribed circle; the method comprises the steps: acquiring image information of a workpeice, performing image pretreatment to the acquired image information, blocking the image information according to the distribution of elliptical holes on the image information and solving the maximum inscribed circle of the elliptical holes in each block of images; calculating the length of a minor semi-axis, the length of a major semi-axis and an inclined angle of the elliptical holes according to the maximum inscribed circle; comparing the length of the minor semi-axis, the length of the major semi-axis and the inclined angle of the elliptical holes with the size of a standard elliptical hole and judging whether the elliptical hole group on the workpiece is qualified. The method of detecting the elliptical hole group combines with a machine vision technology and an elliptical maximum inscribed circle algorithm and overcomes the disadvantages of high cost, large time consumption and low precision in the traditional detection method for the hole group.

Description

technical field [0001] The invention belongs to the technical field of workpiece detection, and in particular relates to a detection method and system for an elliptical hole group based on a maximum inscribed circle. Background technique [0002] In the process of mechanical parts processing, it is an indispensable link to detect the size specifications of the produced parts. Traditional detection methods include comprehensive gauge measurement and three-coordinate machine detection. However, the comprehensive gauge measurement inspection is not very sensitive to the actual size and shape of the measured hole set. Three-coordinate machine detection has high technical requirements for operators, and the cost is high. With the continuous improvement of the level of science and technology, machine vision technology is gradually applied to the online monitoring of workpieces. For the machine vision processing of elliptical workpieces, researchers continue to explore from vari...

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Application Information

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IPC IPC(8): G01B11/00
Inventor 宦海黄凌霄卢松张雨
Owner NANJING UNIV OF INFORMATION SCI & TECH
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