In this paper, a 3D shape measurement system based on a digital fringe projection and
phase-shifting technique was described. The fringe generated by a computer was projected onto the
object by utilizing a digital video projector. Four steps phase shifting algorithm was used to calculate
the 2π wrapping phase, and a heterodyne principle was used to unwrap the phase to obtain the real
phase. Then the 3D coordinates object was calculated base on stereo vision algorithm by using the
real phase as a constraint. Experiments demonstrated that the system was not sensitive to the phase
error caused by the DVP’s nonlinearity.
Phase error compensation for three-dimensional shape measurement based on a phase-shifting method