Automated Optical Inspection (AOI) is an automated visual inspection/ computerized process used to inspect, classify and analyze defects of electronic components that may not be visible to the naked eye. It is widely implemented in electronics manufacturing industry to ensure quality and reliability of electronic products. By capturing high-resolution images from various angles and lighting conditions, manufacturers could receive a real time report and correct the detected defects on time by reworking or replacing the faulty components to prevent problems caused in final product.