Method and system for visual measurement of contour degree of mechanical parts

Abstract

The invention discloses a method and system for the visual measurement of the profile of a machine part, and the system comprises an image obtaining module, a processing module, and a prompt module. The image obtaining module is used for obtaining a gray scale image of a standard part and a grey-scale image of a to-be-detected part. The processing module is used for respectively obtaining the contour edge characteristics of the gray scale image of the standard part and the contour edge characteristics of the grey-scale image of the to-be-detected part through an edge processing algorithm. The method and system carry out the feature point matching operation of the contour edge characteristics of the gray scale image of the standard part and the contour edge characteristics of the grey-scale image of the to-be-detected part, and enables the contour edge characteristics of the gray scale image of the standard part and the contour edge characteristics of the grey-scale image of the to-be-detected part to be in a minimum error state. The contour edge characteristics of the grey-scale image of the to-be-detected part are compared with the contour edge characteristics of the gray scale image of the standard part, so as to obtain a profile error. The method and system judge whether the profile error is within a preset profile error range or not. The method and system reminds that the profile of the to-be-detected part is qualified through a prompt module if the profile error is within the preset profile error range. The method and system reminds that the profile of the to-be-detected part is not qualified through a prompt module if the profile error is not within the preset profile error range. The method and system can judge whether the profile of the machine part is qualified or not quickly and precisely no matter whether the profile of the machine part is regular or irregular.

Description

technical field [0001] The invention relates to a method and system for visually measuring the profile of mechanical parts. Background technique [0002] Profile degree refers to the change of the measured actual profile relative to the ideal profile. This concept is used to describe the accuracy of the shape of a surface or curve. Line profile tolerance refers to the allowable variation of the actual measured profile to the theoretical profile. [0003] For regular contour curves, simple mathematical equations can be used to describe them. After obtaining a series of coordinate values ​​of nodes, they can be fitted with known mathematical equations to obtain a line with a complete positioning reference for measuring and fitting the actual The expression for the contour is then compared to the theoretical contour. For irregular contour curves, since they cannot be described by known mathematical equations, there is still no simple and accurate method to obtain the contour...

AI Technical Summary

Problems solved by technology

For irregular contour curves, since they cannot be described by known mathematical equations, there is still no simple and accurate method to obtain the contour degree of mechanical parts with irregular contour curves

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