Saturation-induced phase error correction method in 3-D measurement based on inverted fringes.

Area of Science:

• Optical Metrology
• 3-D Imaging Technologies

Background:

• Saturation-induced phase errors pose a significant challenge in traditional 3-D measurement using fringe projection profilometry.
• High dynamic range is crucial for accurately capturing complex surfaces with varying reflectivity.

Purpose of the Study:

• To develop a novel, high dynamic range 3-D measurement method for fringe projection profilometry.
• To address and mitigate saturation-induced phase errors in 3-D measurements.

Main Methods:

• Proposed a new method utilizing inverted fringes for phase extraction.
• Employed the 3fH+2fM+2fL algorithm with a set of inverted fringe patterns.
• Analyzed 72 fringe replacement scenarios for wrapped phase calculation.

Main Results:

• Successfully replaced saturated pixels in original fringes with unsaturated pixels from inverted fringes.
• Experimental validation confirmed the effectiveness of the inverted fringe method.
• Demonstrated a significant improvement in measurement accuracy under challenging lighting conditions.

Conclusions:

• The inverted fringe method offers a simple and convenient solution for high dynamic range 3-D measurement.
• Eliminates the need for complex exposure and projection intensity adjustments.
• Paves the way for more robust and accessible 3-D profilometry applications.