AOI (Automated Optical Inspection) is a high-speed and high-precision optical image inspection system. It uses machine vision as the inspection standard technology to improve the shortcomings of traditional manual inspection using optical instruments. The application level includes research and development from high-tech industries, manufacturing quality control, and even national defense, people's livelihood, medical care, environmental protection, electric power, etc., but why do we need AI when we have AOI? Let's find out together.