This model is mainly for special materials, such as aluminum film, aluminized film, laser film and BOPP full transparent film. Because these materials have smooth surface and mirror reflection on the light, the full transparent film material itself is full transparent. Therefore, for such needs and applications, it is necessary to carry out targeted evaluation and design of the optical system. At the same time, in In actual production practice, there are more and more ultra wide format detection and material positive and negative detection at the same time. Considering the complexity of such products, dual camera detection system and positive and negative detection system are introduced.