Double-Refraction Scan: 3D Shape Recognition for Reflective Objects by using Birefringence

We propose a method to recognize the 3D structures of reflective objects. Scanning the 3D shape of reflective objects usually requires huge and expensive measurement equipment.  On the other hand, this system only requires plastics films for consumer use and a camera with light.  This setup can be used to find disconnection of an electric circuit made of conductive ink, and discover slight distortions on wings of drones.