A Separation Method of Superimposed Gratings in Double-Projector Fringe Projection Profilometry Using a Color Camera

Fringe projection profilometry has been intensively studied for several decades. However, due to the limitation of field range a single projector, when measuring objects with complex surfaces, there are always shadow areas in captured images, resulting missing measurement data dark areas. To solve this problem, systems double projectors and camera were employed. Not only reduced, but system recalibration multiple measurements not needed, improving efficiency. Nevertheless, separating corresponding pattern from superimposed fringe presented difficult problem. A color RGB three channels. When is applied profilometry, information obtained times as much that monochrome camera. Due small overlap between red- blue-light spectra response cameras, channel crosstalk can be ignored. This paper proposes method project red blue patterns two utilize characteristics channels separate superposition grating pattern. The original recovered integrally easily. explain effectiveness separation, simulation experiments carried out. Both them showed separated correctly, proving our feasible.