Quasi noise-free digital holography

Area of Science:

• Optics and Photonics
• Image Processing

Background:

• Coherent light sources in Digital Holography (DH) introduce significant noise, degrading reconstruction quality.
• Existing holographic noise suppression techniques offer limited effectiveness.

Purpose of the Study:

• To develop a novel framework for quasi noise-free Digital Holography reconstructions.
• To significantly enhance the quality of holographic images beyond current state-of-the-art.

Main Methods:

• Encoding multiple uncorrelated digital holograms.
• Applying block grouping and collaborative filtering techniques.
• Optimizing the joint action of these image-denoising methods.

Main Results:

• Achieved quasi noise-free Digital Holography (DH) reconstructions.
• Removed up to 98% of noise while preserving image contrast.
• Demonstrated experimental validation for single- and multi-wavelength DH.

Conclusions:

• The proposed framework offers superior holographic noise suppression compared to existing methods.
• Reconstruction quality rivals non-coherent techniques, setting a new standard for DH.
• The method is validated and shows significant improvements in holographic image quality.