In many aspects of automobile manufacturing, unmanned operation has been achieved, so it requires a reliable detection technology to verify the correctness of each assembly and assembly components, machine Vision technology with its unique technical advantages become the first choice of automatic detection system. Among them, the automobile assembly and parts detection includes parts size, appearance, shape, assembly parts misassembly, direction, location detection, code reading, model, production date detection; Assembly with Robot welding guidance and quality testing, electrical performance testing, functional testing, license plate recognition in intelligent transportation.