A method for fast 3D fringe projection measurement without phase unwrapping

At present, fringe projection profilometry has also been limited with a trade-off between speed and accuracy. For achieving high accuracy measurement, phase-shifting and phase-unwarpping operations will always be used for phase correspondence, however, the phase-unwrapping processing does not contribute to improve the phase accuracy, but just to distinguish phase steps. For futher reducing the projection pattern for phase-unwarpping, we propose a novel method for phase corresponding in bi-cameras system without phase unwrapping. Phase-to-3D mapping structures are utilized to obtain the candidate correspondences and eliminate the ambiguties with wrapped phase, which is implemented efficiently without time-comsuming phase correspondence searching. The experiments on both static and dynamic scenes are perfomed to verify its capability of 120 fps 3D reconstructing speed by overlapped using 3-step phase-shifting pattern.