CFZA camera: a high-resolution lensless imaging technique based on compound Fresnel zone aperture

Area of Science:

• Optics and Photonics
• Image Processing
• Computational Imaging

Background:

• Traditional lensless imaging with Fresnel Zone Apertures (FZA) faces resolution limits.
• The outermost ring breadth of the FZA typically dictates the achievable resolution.

Purpose of the Study:

• To break the conventional resolution limitation in FZA-based lensless imaging.
• To enhance image resolution using high-order diffraction components.
• To mitigate noise issues in high-order reconstruction.

Main Methods:

• Proposed a high-order transfer function backpropagation (HBP) algorithm utilizing high-order FZA components.
• Introduced a Compound FZA (CFZA) by merging partial FZAs operating at different orders.
• Balanced noise and resolution by optimizing the CFZA mask.

Main Results:

• CFZA-based imaging achieved double the resolution of traditional FZA cameras with identical outer ring breadth.
• High-quality image reconstruction was achieved using a single HBP algorithm without calibration.
• Demonstrated a cost-effective solution for high-resolution lensless imaging.

Conclusions:

• The CFZA effectively enhances resolution in lensless imaging systems.
• The proposed HBP algorithm enables high-quality reconstruction with the CFZA.
• This method expands the application potential of FZA-based lensless imaging.