Generation of phase-only Fresnel hologram based on down-sampling

Area of Science:

• Optics and Photonics
• Computational Imaging

Background:

• Holography enables 3D image reconstruction.
• Phase-only holograms offer advantages in storage and processing.
• Existing methods for phase-only hologram generation can be complex and prone to noise.

Purpose of the Study:

• To introduce a novel, non-iterative method for generating phase-only Fresnel holograms.
• To demonstrate the generation of sampled-phase-only holograms (SPOH).
• To evaluate the quality and performance of holograms generated by the proposed method.

Main Methods:

• Down-sampling the intensity image of an object scene using uniform grid-cross lattices.
• Generating a Fresnel hologram using intensity and depth information of sampled object points.
• Preserving only the phase component to create a pure phase hologram (SPOH).

Main Results:

• Generated SPOHs result in high visual quality for both numerical and optical reconstructions.
• Optical reconstructed images are brighter than those from error-diffusion methods.
• The proposed method shows reduced susceptibility to phase noise contamination.

Conclusions:

• The novel non-iterative method effectively generates high-quality phase-only Fresnel holograms.
• SPOHs produced by this method offer improved brightness and noise performance.
• This approach provides a viable alternative to existing error-diffusion techniques for hologram generation.