A novel algorithm of image processing for the analysis of carrier fringe pattern is proposed. Only one fringe Pattern that is carrier ceded is need for extracting unambiguous information. The coded fringe pattern is first FFF filtered to get an initial phase with carrier phase in it. Several times of phase shift iteration are carried out to improve the phase. Then the carrier is removed by subtracting the pure barrier phase from the cede phase. The algorithm offer higher precision over the FFT-transform technique in literature.