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Related Experiment Video

Updated: May 13, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

Single shot high resolution digital holography.

Kedar Khare¹, P T Samsheer Ali, Joby Joseph

¹Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India. kedark@physics.iitd.ac.in

|March 14, 2013

Summary

This summary is machine-generated.

A new computational method recovers high-resolution images from single digital holograms. This technique excels even with overlapping frequency terms, offering clear images with minimal noise.

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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Area of Science:

Computational imaging
Digital holography
Image processing

Background:

Digital holography records 3D information optically.
Traditional hologram reconstruction can suffer from artifacts like DC and twin images.
Image quality is often limited by overlapping frequency terms in the hologram.

Purpose of the Study:

To develop a novel computational method for high-resolution image recovery from single digital hologram frames.
To overcome limitations of physical hologram replay, particularly with overlapping spectral terms.
To achieve high-quality image reconstruction with reduced artifacts and noise.

Main Methods:

Solving a constrained optimization problem to obtain the complex object field.
Utilizing a computational approach distinct from physical hologram replay.
Applying the method to a Fresnel zone hologram recorded with a small off-axis angle.

Main Results:

Successful high-resolution image recovery from a single hologram frame.
Effective separation of object field even when DC and cross terms overlap in the Fourier domain.
Excellent image recovery observed without DC or twin image terms.
Minimal speckle noise in the reconstructed images.

Conclusions:

The proposed computational method enables high-quality, artifact-free image recovery from digital holograms.
This approach offers a significant advancement over traditional physical reconstruction techniques.
The method is robust even under challenging recording conditions, such as overlapping spectral components.