Abstract:

As the printed circuit board (PCB) manufacturing process is becoming increasingly complicated, identifying the position of capacitor elements becomes more challenging. In order to save costs and reduce the error rate in actual production, the circuit board needs to be detected before welding. At the same time, in order to fix the components, a plate is often used to fix circuit boards. We propose a positioning method for covered capacitor elements under a complex background. We perform image preprocessing, threshold segmentation, edge extraction, Harris corner detection and other operations on the collected PCB images, and then locate capacitor elements according to the geometric characteristics of their target contour. The method can be widely applied in production due to the high positioning accuracy and fast speed.

Key words: capacitor element, corner detection, geometric features, image processing, positioning method