Three-dimensional information security combined fringe projection with double random phase encoding

Three-dimensional (3D) information security with optical fringe projection encoding is proposed. The 3D information about an object, which is encoded into two-dimensional (2D) deformed and reference fringes by optical fringe projection, are encrypted by use of double random phase encoding (DRPE). Deformed and reference fringes, regarded as phase and amplitude respectively, are simultaneously modulated by random phase keys. The key-space is enlarged, because the keys for decryption are not only the random phase masks, but also the calibration parameters of the fringe projection system. The proposed method is robust to noise. Experiment is performed to obtain the reference and deformed fringes. Numerical simulations are employed to verify the validity of the proposed method.