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A multi-area precise positioning method for large-format pcb boards

A PCB board, precise positioning technology, applied in the field of multi-area precise positioning of large-format PCB boards, can solve the problems of poor accuracy, inaccuracy, and low generality of PCB positioning technology, so as to eliminate deformation errors, improve computing efficiency, and improve generalization. The effect of sex and precision

Active Publication Date: 2020-10-30
FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a multi-area precise positioning method for a large-format PCB board, which solves the problems of the existing PCB positioning technology such as low versatility, poor precision, and inaccurate positioning, and improves the accuracy of positioning. Provides the basis for subsequent PCB defect detection

Method used

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  • A multi-area precise positioning method for large-format pcb boards
  • A multi-area precise positioning method for large-format pcb boards
  • A multi-area precise positioning method for large-format pcb boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] Embodiment: A multi-region precise positioning method for a large-format PCB board.

[0023] S1, divide the template image Image_Model and the rough positioning image Image_Rough into N blocks according to the preset segmentation area and overlapping area; The number N and the size of the overlapping area are preset according to the size of the original image, and the purpose of setting the overlapping area is to improve the accuracy.

[0024] S2, select the first image block Image_ReducedM1 of the template map, perform a connected domain operation, and obtain all the graphics in it; use the circularity and rectangularity as the threshold, cut all the graphics in Image_ReducedM1 into three types: circle, rectangle and special shape kind.

[0025] S3, same as above, classify the graphics in the first graphic block Image_ReducedR1 of the coarse positioning map into three categories: circle, rectangle and irregular shape. The set of three types of graphics intersects wit...

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Abstract

The invention provides a multi-region accurate positioning method for a large-format PCB. The method comprises the following steps: dividing a template graph and a coarse positioning graph into a plurality of regions; carrying out feature positioning according to graphic features in the small areas; respectively extracting circle, rectangle, other shapes and other characteristics to obtain deviation values of corresponding regions, finally selecting four regions with minimum variance from all the region deviation values as accurate positioning values of the whole image, and performing perspective transformation on the coarse positioning image according to the accurate positioning values to obtain an accurately positioned target image; according to the method, the problems of low positioning precision, low speed and the like of an existing PCB are solved by adopting a multi-region multi-shape feature positioning method, positioning errors caused by board bending can be effectively reduced, and the positioning speed and precision of the large-format PCB are greatly improved.

Description

technical field [0001] The invention relates to the technical field of detection equipment, in particular to a multi-region precise positioning method for a large-format PCB board. Background technique [0002] Printed circuit board (Print Circuit Board, PCB) due to the improvement of the production process and the improvement of precision, the requirements for automatic optical inspection in production are becoming more and more stringent, in the steps of image acquisition, image positioning, defect identification and defect classification in the PCB inspection process , the precision of image positioning will directly affect the precision and accuracy of defect detection. [0003] At present, common PCB board positioning methods include mark point (Mark point) positioning and feature point positioning. However, because the standards of each printed circuit board company are slightly different, and large-format PCB boards will have different degrees of deformation such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/11G06T7/155G06T7/187G06T7/62
Inventor 魏登明王华龙张美杰张璐李凡
Owner FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST
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