I have been using the coherence scanning interferometry (or also known as white light scanner), where it collects images containing the fringes. The system is able to produce the depth profile for one image stacks with the fringes.
If we plot the intensity of one pixel of a particular point in which the fringe will passing by on a 2d-plot (stack vs intensity), we can see some sinusoidal wave profile.
I like to understand how the phase shifting method works on the fringe images to derive the depth information? Is it based on the phase difference on one point ? Can the sinusoidal profile be used in the method at all ?