High-efficiency de-scattering 3D measurement with a single exposure based on polarization angle shifting

Area of Science:

• Optical Engineering
• Image Processing
• Metrology

Background:

• Scattering effects in optical 3D measurements introduce global illumination, complicating separation from direct light.
• Conventional methods for suppressing global illumination require manual adjustments, limiting real-time applications.

Purpose of the Study:

• To develop an efficient, single-exposure method for separating global and direct illumination components in optical 3D measurements.
• To overcome the limitations of existing polarization-based techniques for de-scattering imaging.

Main Methods:

• Analysis of polarization camera intensity distribution using Malus's law to establish a polarization angle shifting (PAS) model.
• Development of a pixel-by-pixel separation strategy for global-direct light transmission components.
• Elimination of the requirement for linear polarization of the light source.

Main Results:

• Achieved efficient separation of global and direct illumination components with a single exposure.
• Obtained contamination-free phase data of scattering interfaces and global information imaging.
• Demonstrated effective de-scattering 3D phase results in a structured light measurement system.

Conclusions:

• The proposed PAS model and separation strategy effectively address the challenges of scattering effects in optical 3D measurements.
• The method enhances real-time detection and adaptability by enabling single-exposure separation.
• Validated effectiveness through experimental results in structured light measurement systems.