Image reconstruction only by phase data in phase-shifting digital holography.

Area of Science:

• Optics and Photonics
• Digital Imaging
• Data Science

Background:

• Phase-shifting digital holography (PSDH) is a technique for recording and reconstructing 3D objects.
• Complex amplitude data, comprising both amplitude and phase, is typically used for reconstruction.
• Data compression in holographic imaging is crucial for efficient storage and transmission.

Purpose of the Study:

• To investigate the feasibility and impact of data compression on phase-shifting digital holography.
• To determine the minimum bit depth required for acceptable image reconstruction.
• To develop and validate methods for mitigating artifacts introduced by data compression.

Main Methods:

• Experimental reconstruction of diffusely reflecting objects using only phase data from PSDH.
• Systematic reduction of phase data bit depth, down to 1 bit.
• Quantitative verification using one-dimensional simulations.
• Development and application of a smoothing procedure for compressed holographic images.

Main Results:

• Successful image reconstruction from phase data alone was demonstrated.
• Image quality remained largely intact even with phase data reduced to 1 bit depth.
• An enhancement of halo artifacts was observed at lower bit depths.
• The proposed smoothing procedure effectively addressed compression-induced artifacts.

Conclusions:

• Phase data alone is sufficient for reconstructing images in phase-shifting digital holography.
• Significant data compression is achievable with minimal loss of image fidelity.
• Careful processing, including smoothing, is necessary to manage artifacts from aggressive data reduction.