Automotive special-shaped parts (engine camshafts, crankshafts, automotive interior parts IP, ID and other components) are characterized by irregularities, and difficulties such as reflective curved surfaces cause machine vision intelligent detection problems. The development of intelligent detection technology for such products in China is relatively slow. At present, more than 90% of the special-shaped parts production enterprises still remain in the manual visual inspection method. However, manual visual inspection is slow in detecting complex defects and has poor reliability (such as manual visual inspection of camshafts, skilled quality inspectors need 2-3 minutes per piece).