Key Techniques of AOI for PCB SMT Assembly Products

The Study of AOI synthetically uses embedded technology,optical technology,digital image processing,machine vision technology and so on.With the development of real-time and higher precision requirement,The higher performance defect detection strategy and arithmetic design become the key parts of AOI system.After discussing the all defects of PCB,common inspecting methods and the research history and the existing state on AOI,this paper has researched the defects pattern recognition and the inspection algorithm.