3D measurement method based on Gray code and single sine fringe image

Abstract

FPP has been widely used in the industrial field and with the development of this technology, improving the measurement efficiency becomes a hot direction. Based above, a new single phase-shifting method is proposed in this paper. First, the background intensity is reduced in the sine fringe image and the processed image is normalized to double precision number [-1,1]. Then, we perform arcsine operation and adjust the results according to the Gray code array to get the wrapped phase. Finally, the wrapped phase is combined with the Gray code array and compensated according to the actual situation to get the unwrapped phase. The proposed method could obtain the relevant 3D information from single sine fringe image. Experiments show that the corresponding measurement efficiency is improved by 50% compared with the complementary Gray code combines 2+1 phase-shifting profilometry and the complementary Gray code combines N+2 phase-shifting profilometry.