FPC line detection method based on feature tracking and skeleton feature matching

Abstract

The invention provides an FPC line detection method based on feature tracking and skeleton feature matching. The method comprises a template graph feature point extraction step, a feature point template establishment step, a to-be-measured graph positioning point offset acquisition step, an affine transformation matrix acquisition step, a feature point tracking step, a to-be-measured graph featurepoint extraction step, an abnormal feature point set acquisition step and an open circuit and short circuit coordinate acquisition step. According to the invention, the problems of accumulative errors and the like caused by FPC deformation are solved; based on the principle that an abnormal end point is generated during open circuit and an abnormal branch point is generated during short circuit,the tracking range of feature points is flexibly set according to the actual deformation degree, then the tracked feature points are compared with feature points extracted from an actual to-be-measured graph, and finally accurate defect information of short circuit and open circuit of a circuit is obtained. According to the open circuit and short circuit detection method, the open circuit and short circuit detection effect on the FPC with reasonable deformation is good, the accuracy and efficiency of open circuit and short circuit detection are improved, the detection precision is improved, and the robustness is improved.

Description

technical field [0001] The invention relates to the technical field of flexible printed circuit board circuit detection, in particular to an FPC circuit detection method based on feature tracking and skeleton feature matching. Background technique [0002] Flexible Printed Circuit (FPC) is a circuit board made of PET as the base material. It has the characteristics of thin thickness, light weight, softness and bendability, and is widely used in electronic devices such as mobile phones, notebook computers, and LCD displays product. With the improvement of circuit board production process and precision, FPC products are developing in the direction of miniaturization and high density, and the requirements for product quality inspection are becoming more and more stringent in the production process. At present, the common detection method is still manual visual inspection or simple optical detection equipment. Since FPC is a flexible circuit board and is prone to deformation, ...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an FPC line detection method based on feature tracking and skeleton feature matching in view of the above-mentioned deficiencies in the prior art, which solves the technical problems of improving the accuracy and efficiency of FPC line open-short circuit detection, improving detection accuracy, and improving robustness

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