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Method for positioning circular Mark points based on EDLines

A circle and anchor point technology, applied in the field of visual inspection, can solve the problems of slow speed, large error, and inability to complete template matching accurately, and achieve the effect of reducing error rate, reducing the generation of error circle, and overcoming the influence of positioning

Pending Publication Date: 2021-11-19
杭州展晖科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the template matching method is often unable to accurately complete the template matching due to the influence of factors such as sample scaling, rotation, and illumination changes.
However, the existing circle fitting method has a large error and a slow speed after one fitting.

Method used

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  • Method for positioning circular Mark points based on EDLines
  • Method for positioning circular Mark points based on EDLines
  • Method for positioning circular Mark points based on EDLines

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some, not all, embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the description of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.

[0036] In one of the embodiments, a method for locating circular Mark points based on EDLines is provided. Through two circ...

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Abstract

The invention discloses a method for positioning a circular Mark point based on EDLines. The method comprises the following steps: collecting a grayscale image containing the circular Mark point; and extracting line segments in the grayscale image by adopting an EDLines algorithm to realize positioning of the circular Mark points. According to the method, the EDLines algorithm and the curve fitting method are combined, the generation of error circles is greatly reduced by adopting two times of circle fitting, meanwhile, the positioning speed is increased by combining the EDLines algorithm, the influence of conditions such as sample incompleteness and severe sampling environment on positioning is effectively overcome, and the error rate of edge detection is reduced.

Description

technical field [0001] The application belongs to the technical field of visual inspection, and in particular relates to a method for locating circular Mark points based on EDLines. Background technique [0002] In the PCB board design stage, designers usually make circular Mark points as positioning references, so as to lay a good foundation for subsequent effective testing. The Mark point of the PCB board is the position identification point that the PCB is applied to the automatic placement machine in the circuit board design, also called a mark point or a feature point. [0003] The basic principle of visual inspection of PCB board is: after image processing, judge the location of the logo according to the statistics of pixel points, then compare the detected logo points with the standard positioning points, and compensate if errors are found, so as to improve the accuracy of the PCB board. positioning accuracy. [0004] The traditional positioning of circular Mark poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/13G06T7/70
CPCG06T7/0004G06T7/70G06T7/13G06T2207/10004G06T2207/30141
Inventor 楼杰陶如梦董辉罗立锋彭宣聪吴祥
Owner 杭州展晖科技有限公司
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