Color-image reconstruction for two-wavelength digital holography using a generalized phase-shifting approach

Area of Science:

• Optical Imaging
• Holography
• Image Reconstruction

Background:

• Digital holography typically reconstructs single-wavelength images.
• Chromatic aberration is a common issue in multi-wavelength holographic reconstruction.
• Accurate color image reconstruction requires precise phase information for each wavelength.

Purpose of the Study:

• To develop a color-image reconstruction method for two-wavelength digital holography.
• To address and overcome chromatic aberration in holographic imaging.
• To enable simultaneous phase shifting for multiple wavelengths.

Main Methods:

• Utilizing generalized phase-shifting digital holography (GPSDH) for object wave extraction.
• Employing a Bayer array color filter for capturing color interference fringes.
• Implementing a color-separation method to suppress crosstalk and isolate monochromatic fringes.
• Using a shifted Fresnel transform for image reconstruction and superposition.

Main Results:

• Successful separation of color interference fringes into monochromatic ones.
• Accurate object wave extraction for each wavelength using GPSDH.
• Reconstruction of dual-color images without chromatic aberration.
• Validation of the method through optical experiments.

Conclusions:

• The proposed GPSDH method effectively reconstructs color images in two-wavelength digital holography.
• The technique successfully eliminates chromatic aberration in the reconstructed images.
• This method offers a robust solution for multi-wavelength holographic color imaging.