Defocusing parameter selection strategies based on PSF measurement for square-binary defocusing fringe projection...

Area of Science:

• Optics and Photonics
• Metrology
• Computer Vision

Background:

• Three-dimensional (3D) shape measurement systems utilize binary defocusing techniques for high-speed and flexible measurements.
• Accurate setting of the defocusing degree and fringe period is challenging in these systems.
• Existing methods lack a systematic approach for parameter selection.

Purpose of the Study:

• To develop a framework for selecting square-binary defocusing parameters in 3D shape measurement.
• To mathematically analyze fringe formation and quantify the defocusing degree.
• To improve the quality and robustness of 3D shape measurement systems.

Main Methods:

• Mathematical analysis of the fringe formation process.
• Quantification and manipulation of defocusing degree using projector focusing distance, calibrated via point spread function measurement.
• Modeling single-point sinusoidal error as an objective function for evaluating defocusing effects.

Main Results:

• A novel square-binary defocusing parameter selection framework is presented.
• The defocusing degree is precisely controlled and calibrated.
• The framework allows for easy acquisition of appropriate defocusing parameters based on system setup.

Conclusions:

• The proposed framework simplifies parameter selection for binary defocusing in 3D shape measurement.
• The method enhances the quality and robustness of the measurement system.
• This work provides a practical solution for optimizing defocusing parameters in optical metrology.