Time-variant spatial masking for real-time single-photon imaging against strong ambient light

Area of Science:

• Optics and Photonics
• Computational Imaging
• Photonics

Background:

• Real-time single-photon imaging faces challenges in accurately capturing reflectivity and depth under intense ambient light.
• Existing methods struggle with dynamic scenes and high illumination levels.

Purpose of the Study:

• To develop a novel method for enhancing reflectivity images guided by depth information in real-time single-photon imaging.
• To address the limitations of imaging under strong ambient light conditions.

Main Methods:

• A novel method employing a time-variant spatial mask (TV-SM) dynamically loaded onto a spatial light modulator (SLM).
• The TV-SM optimizes global incident light flux for improved image reconstruction.
• Depth-guided reflectivity enhancement for accurate target characterization.

Main Results:

• The proposed method successfully reconstructs both reflectivity and depth of moving targets at velocities up to several meters per second.
• Achieved a high imaging rate of approximately 18 Hz, enabling real-time performance.
• Demonstrated significant improvement in imaging accuracy under strong ambient light.

Conclusions:

• The developed method offers a robust solution for real-time single-photon imaging in challenging, high-ambient-light environments.
• The technique shows substantial potential for applications requiring accurate real-time reflectivity and depth mapping of dynamic targets.