New phase measurement profilometry using fringe projection

A new phase measurement profilometry based on fringe projection is presented, which combines the phase-shifted fringe patterns and a centerline pattern to determine the absolute phase of the object, A conversion algorithm is then used to convert the absolute phase to the x,y,z coordinates of the object surface, To determine the unwrapping phase of the object, a projected gray code fringe pattern is proposed to calculate the jump phase 2 pi *n, which can measure the object existing large height steps and/or spatially isolated surfaces. The validity of this method is verified experimentally.