Color encoding of binary fringes for gamma correction in 3-D profiling

Area of Science:

• Optics and Photonics
• Metrology
• Computer Vision

Background:

• Nonlinear camera and projector responses distort 3D profiling using sinusoidal fringe projection and PSI algorithms.
• Accurate 3D surface reconstruction is crucial in various scientific and industrial applications.

Purpose of the Study:

• To develop a robust fringe generation technique that mitigates distortions caused by nonlinearities in optical systems.
• To enable reliable 3D profiling with phase-shifting interferometry (PSI) algorithms.

Main Methods:

• A novel fringe generation technique projecting and acquiring a temporal sequence of strictly binary color patterns.
• Utilizing the adequately weighted average of binary patterns to create accurate sinusoidal fringe patterns.
• Implementing PSI algorithms on the generated sinusoidal patterns for 3D profile extraction.

Main Results:

• Successfully generated high-quality sinusoidal fringe patterns by averaging binary patterns.
• Demonstrated mitigation of distortions caused by nonlinear camera and projector responses.
• Achieved reliable and accurate three-dimensional surface profiling.

Conclusions:

• The proposed fringe generation technique effectively overcomes nonlinear distortions in 3D profiling.
• This method enhances the reliability and accuracy of PSI-based 3D measurements.
• The technique offers a practical solution for precise 3D surface reconstruction.