Single-shot color phase shifting profilometry method robust against color crosstalk

In this work, a method for retrieving the phase of a single composite color fringe pattern projected onto the surface of colorful objects is presented. Its purpose is two-fold: (a) experimentally prove that the projection of a single composite RGB fringe pattern containing small phase shifts among them, effectively reduces the errors introduced by the different responses of the RGB channels of the CCD and those due to the color crosstalk and (b) to show that we have built a two-step algorithm adequate for processing such fringe patterns. The experimental results are compared with those obtained using a standard temporal four-step phase shifting method, showing that effectively our proposal can be used to reduce the errors introduced by the color of the objects.