Projected feature assisted coarse to fine point cloud registration method for large-size 3D measurement.Fringe projection profilometry has gained significant interest due to its high precision, enhanced resolution, and simplified design. 
Fringe projection profilometry
Using a composite structured light with red speckle patterns for larger areas and blue sinusoidal fringe patterns for smaller ones, projected onto the surface, which allows us to accomplish simultaneous 3D reconstruction and point cloud registration. 
composite structured light with red speckle patterns
Using a composite structured light with red speckle patterns for larger areas and blue sinusoidal fringe patterns for smaller ones, projected onto the surface, which allows us to accomplish simultaneous 3D reconstruction and point cloud registration. 
blue sinusoidal fringe patterns