A novel phase-shifting method based on strip marker

A new phase-shifting method to obtain rapid phase measurement is proposed. Different from the traditional four-step phase-shifting algorithm, a strip marker is added in the projected fringe, which gives the indication for strip order. By the presented phase algorithm, not only the primary phase map but also the strip order can be obtained from the phase-shifting images, and thus the final phase map can be obtained. Using this method, no additional fringe pattern is required, that makes the time cost on fringe projection highly reduced. Experimental results show that the new algorithm has more efficiency in phase measurement. (C) 2009 Elsevier Ltd. All rights reserved.