Phase-3D mapping method developed from back-projection stereovision model for fringe projection profilometry.

Area of Science:

• Optics and Photonics
• Computer Vision
• Metrology

Background:

• Fringe projection profilometry (FPP) is a key 3D reconstruction technique.
• Existing methods like phase-height mapping and stereovision have limitations: restricted flexibility and time-consuming point searching, respectively.

Purpose of the Study:

• To develop a novel, flexible, and high-efficiency 3D reconstruction method for FPP.
• To overcome the limitations of traditional phase-height mapping and stereovision techniques.

Main Methods:

• A phase-3D mapping method based on a back-projection stereovision model was proposed.
• A two-step calibration strategy involving ray reprojection and sampling-mapping was designed to determine mapping coefficients.
• Direct mapping of all dimensional coordinates (X, Y, Z) from phase using rational functions was achieved.

Main Results:

• The proposed method enables direct and independent mapping of X, Y, and Z coordinates from phase data.
• A flexible two-step calibration strategy was successfully implemented.
• Experimental results confirmed the method's suitability for flexible and high-efficiency 3D reconstruction.

Conclusions:

• The developed phase-3D mapping method offers a significant improvement for fringe projection profilometry.
• It provides a flexible and efficient solution, eliminating practical restrictions and the need for time-consuming homogenous point searching.