Weighted phase unwrapping utilizing intensity modulation analysis for phase-shifting profilometry

Path independent algorithm is frequently used for two-dimensional phase unwrapping. The weighted phase unwrapping technique recently published by Ghiglia and Romero, which is based on least-squares method, obtained by the fast cosine transform, is a robust and fast path independent solution. We have improved weighted phase unwrapping by utilizing intensity modulation analysis to determine the weights for phase-shifting profilometry. An experimental result of object shape measurement is given to prove the validity of this technique, and make a contrast between the binary weight and decimal weight constructed by modulation analysis.