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Circular workpiece plane coordinate high-precision positioning method based on machine vision

A technology of circular workpiece and plane coordinates, used in instruments, graphic image conversion, image data processing, etc., can solve the problem of inability to achieve micron-level precision positioning of workpieces, and achieve the effect of meeting precision requirements, high precision, and improving positioning accuracy.

Pending Publication Date: 2021-11-02
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing laser processing cannot realize the micron-level precision positioning of the workpiece, and to provide a high-precision positioning method for the plane coordinates of circular workpieces based on machine vision

Method used

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  • Circular workpiece plane coordinate high-precision positioning method based on machine vision
  • Circular workpiece plane coordinate high-precision positioning method based on machine vision
  • Circular workpiece plane coordinate high-precision positioning method based on machine vision

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Embodiment Construction

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0036] The invention provides a machine vision-based high-precision positioning method for the plane coordinates of a circular workpiece. The method mainly ensures the micron-level precision positioning of the workpiece from two aspects of hardware and algorithm. First of all, in terms of hardware, use a high-resolution camera, choose a camera with a resolution greater than 4 million, and the field of view should be less than 2mm, and 1 pixel represents 1μm, that is to say, when the light source illuminates the workpiece, the image is clear and the algorithm is accurate and there is no error Under ideal conditions, the positioning accuracy can reach up to 1 μm; in order to further ensure the accuracy and reduce the impact of imaging quality and algorithm errors, the image quali...

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Abstract

The invention provides a circular workpiece plane coordinate high-precision positioning method based on machine vision. The problem that workpiece micron-order precision positioning cannot be achieved through existing laser machining is solved. The method comprises the following steps: 1) determining parameters of a camera; 2) acquiring images of edges of different parts of the processed workpiece; 3) acquiring a high-resolution image; 4) eliminating holes in the workpiece area in the image; 5) by adopting a sub-pixel edge detection algorithm based on a Zernike moment, extracting contour coordinate points of the processed workpiece in each image, then converting pixel coordinates into machine tool coordinate system coordinates, and compensating the contour coordinate points of each part to obtain machine tool coordinate system absolute coordinates corresponding to the coordinates of the contour pixel points of each part; and 6, fitting the absolute coordinates obtained in the step 5 by adopting a random sampling consistency algorithm, and finally obtaining the coordinates of the circle center. The method is based on a machine vision algorithm, and is high in precision, automation degree and efficiency.

Description

technical field [0001] The invention belongs to the field of laser processing, and in particular relates to a high-precision positioning method for plane coordinates of a circular workpiece based on machine vision. Background technique [0002] Laser processing technology is a high-precision processing method that can achieve different micron or even sub-micron manufacturing. It has become a key processing technology in many fields such as aviation, aerospace, navigation, automobiles, and electronics. With the high-precision and high-quality manufacturing requirements put forward in the above fields, higher requirements are put forward for the positioning method and positioning means. With the gradual development of machine vision, machine vision has replaced manual operation as a new means of workpiece positioning monitoring, which can improve work efficiency and better ensure accuracy requirements and reduce errors. [0003] There are many detection and positioning method...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80G06T7/70G06T7/136G06T7/13G06T5/00G06T3/40
CPCG06T7/80G06T7/136G06T3/4053G06T7/13G06T7/70G06T2207/30164G06T5/70
Inventor 李明闫睿
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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