Single-shot 4-step phase-shifting multispectral fringe projection profilometry.

Area of Science:

• Optics and Photonics
• 3D Imaging Technologies
• Metrology

Background:

• Phase-shifting profilometry (PSP) is a highly accurate 3D measurement technique.
• Traditional PSP requires sequential acquisition of multiple fringe patterns, limiting its use to static scenes.
• Real-time 3D imaging remains a challenge for dynamic or fast-moving objects.

Purpose of the Study:

• To introduce a novel multispectral 4-step phase-shifting fringe projection profilometry (FPP) system.
• To enable real-time 3D profilometry through a single-shot acquisition method.
• To overcome spectral crosstalk issues common in simultaneous phase-shifting techniques.

Main Methods:

• Development of a multispectral FPP system capable of capturing four phase-shifted fringe patterns in a single frame.
• Utilizing spectral band separation to prevent light interference between patterns.
• Implementation of the phase-shifting profilometry (PSP) algorithm on the single-frame composite pattern.

Main Results:

• Successful demonstration of 3D imaging from a single acquisition.
• Achieved real-time 3D profilometry capabilities.
• Eliminated spectral crosstalk by employing distinct spectral bands for each phase-shifted pattern.

Conclusions:

• The proposed multispectral 4-step phase-shifting FPP system significantly advances 3D imaging capabilities.
• This single-shot method opens new possibilities for real-time profilometry in dynamic environments.
• The system provides accurate phase retrieval without the need for sequential pattern acquisition.