1. A method comprising: receiving a plurality of scene images that include a phase-shifted fringe embedded with a secondary pattern; determining a wrapped phase map based at least in part on the plurality of scene images; generating a continuous region mask, based at least in part on the wrapped phase map, wherein the continuous region mask identifies a plurality of continuous regions; and determining, for at least one region in the plurality of continuous regions, a period disparity of the fringe for the at least one region.