Re-sampling of inline holographic images for improved reconstruction resolution

TL;DR

This paper introduces a re-sampling technique for inline holographic images that enhances the spatial resolution of reconstructed images in digital holographic microscopy, demonstrated on experimental data including a resolution grid and a gnat wing.

Contribution

The paper presents a novel re-sampling method that inverts interpolated Fresnel diffraction images to improve resolution in holographic reconstructions.

Findings

Enhanced resolution in holographic reconstructions demonstrated experimentally.

Re-sampling improves the quality of images of small objects.

Method applicable to visible-light Gabor holography.

Abstract

Digital holographic microscopy based on Gabor in-line holography is a well-known method to reconstruct both the amplitude and phase of small objects. To reconstruct the image of an object from its hologram, obtained under illumination by monochromatic scalar waves, numerical calculations of Fresnel integrals are required. To improve spatial resolution in the resulting reconstruction, we re-sample the holographic data before application of the reconstruction algorithm. This procedure amounts to inverting an interpolated Fresnel diffraction image to recover the object. The advantage of this method is demonstrated on experimental data, for the case of visible-light Gabor holography of a resolution grid and a gnat wing.