Hybrid profilometry using a single monochromatic multi-frequency pattern.

Area of Science:

• Computer Vision
• Optical Metrology
• 3D Reconstruction

Background:

• Accurate depth acquisition is crucial for 3D imaging and scene understanding.
• Existing profilometry methods often require multiple shots or struggle with complex scenes.

Purpose of the Study:

• To develop a novel, single-shot profilometry scheme for high-quality depth map acquisition.
• To enhance depth accuracy in both smooth and boundary regions of complex scenes.

Main Methods:

• A novel band-wise pattern with spatially modulated fringe bands was designed.
• A hybrid depth acquisition approach combining phase-based profilometry and active stereo was employed.
• A new phase unwrapping algorithm based on depth smoothness was proposed for accurate phase analysis.

Main Results:

• The proposed scheme successfully acquired high-quality depth maps using a single shot.
• Accurate depth values were obtained for smooth regions via phase analysis.
• Boundary regions with discontinuities were robustly handled using spatial stereo, correcting erroneous depth values.

Conclusions:

• The novel profilometry scheme provides a robust and efficient method for high-quality 3D depth acquisition.
• The hybrid approach effectively addresses challenges in complex scenes and isolated objects.
• The developed phase unwrapping algorithm significantly improves depth map accuracy.