Geometric positioning-based flexible circuit board line defect identification method

A technology for flexible circuit boards and circuit defects, which is applied in image data processing, instruments, calculations, etc., can solve the problems of insufficient industrial application and low accuracy of detection results, and achieve the effect of reducing the amount of calculation and improving efficiency

Active Publication Date: 2019-12-06
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy of some test results is low, which is not enough for industrial application

Method used

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  • Geometric positioning-based flexible circuit board line defect identification method
  • Geometric positioning-based flexible circuit board line defect identification method
  • Geometric positioning-based flexible circuit board line defect identification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] Such as figure 1 As shown, a method for identifying defects of flexible printed circuit boards based on geometric positioning includes:

[0051] S1 segments the outline of the line according to the preset number of pixels;

[0052] In general, defects appear on a line outline at intervals, so the line outline needs to be segmented according to a certain number of pixels according to the actual situation.

[0053] S2 calculates the increment factor of each contour segment in the X direction or the Y direction, and roughly locates the candidate defect position;

[0054] Such as figure 2 As shown, when the defect of the line part is suddenly deviated from the direction of the original regular and uniform line, not only the change in the curvature, but also the position of the pixel point on the line outline in the X and Y directions changes greatly. Therefore, when there is a large difference in the cumulative change of the pixel position of the line outline in the X a...

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PUM

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Abstract

The invention discloses a geometric positioning-based flexible circuit board line defect identification method. The geometric positioning-based flexible circuit board line defect identification methodcomprises the following steps: S1, segmenting a line contour according to a preset number of pixel points; S2, calculating an increment factor of each contour section in the X direction or the Y direction, and roughly positioning candidate defect positions; S3, determining a minimum bounding rectangle of the contour section according to the increment factor; S4, determining candidate line defectpositions according to the length-width ratio of the minimum bounding rectangle; S5, measuring the defect positions of the candidate lines on the basis of a Frenet frame; and S6, judging the defect type according to the measurement result. According to the invention, the defects of the recesses and the projections of the FPC circuit part are identified and the sizes of the recesses and the projections are measured, so that the quality of finished products in FPC actual production is guaranteed.

Description

technical field [0001] The invention relates to the field of FPC image processing, in particular to a method for identifying defects of flexible printed circuit boards based on geometric positioning. Background technique [0002] Flexible printed circuit board (Flexible Printed Circuit, FPC) is a kind of rigid printed circuit board (Printed Circuit Board, PCB). FPC lines are conductive patterns that provide electrical connections between components on insulating materials. It is of great significance to detect the line width, line spacing, and the type and size of defects in actual production to ensure the quality of FPC products. [0003] The defects on the surface of FPC can be divided into heavy defects and light defects. Serious defects refer to defects that affect the electrical performance and function of the product, and FPC boards with serious defects can be directly scrapped. Light defect means that it only affects the appearance of the FPC product, and it can st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T7/11G06T7/12G06T7/187G06T7/62G06T7/66
CPCG06T7/0008G06T7/12G06T7/11G06T7/187G06T7/62G06T7/66G06T2207/30141G06T2207/20164
Inventor 杜娟沈思昀姚灵芝
Owner SOUTH CHINA UNIV OF TECH
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