Towards an Improved Method of Dense 3D Object Reconstruction in Structured Light Scanning

Optical three-dimensional shape measurement based on structured light has been widely used for 3D measurement in many different applications. Phase Shifting acquisition methods have been extensively used in these measurements, since they offer robustness against ambient light and reflections variation, but they need a phase unwrapping procedure and further phase-to-height conversions after complex calibrations. Although there have been different proposals last years, the design of an accurate and efficient 3D object reconstruction method is still an open issue. In this paper, we propose a new method of 3D object reconstruction that combines the benefits shown by Multi Phase Shifting and the potential of a phase-to-height mapping that uses implicit calibration. The performance evaluation, measured on virtual environments, show that the proposed method can efficiently deal with the sharp edges of the 3D reconstructed objects, removing the erroneous geometries, while it also avoids the need to geometrically calibrate the projector, a massive time consuming task that produces many problems related to the projector lens distortions. These results validate this proposal as an efficient method for 3D object reconstruction.