Related Experiment Video
Updated: May 1, 2026
07:27
Quantifying Microorganisms at Low Concentrations Using Digital Holographic Microscopy DHM
Published on: November 1, 2017
9.8K
Video-rate computational heterodyne holography.
Optics Letters
|April 2, 2014
Summary
We developed versatile software for rendering optical holograms at video rates using computer graphics hardware. This enables advanced applications like noncontact monitoring and laser Doppler imaging.
Area of Science:
- Computational imaging
- Optical holography
- Scientific software development
Background:
- Holography enables advanced optical measurements but often lacks real-time processing capabilities.
- Existing methods struggle with high-resolution, high-frame-rate hologram acquisition and rendering.
Purpose of the Study:
- To present versatile computational image rendering software for optically acquired holograms.
- To enable video-rate processing of high-resolution holographic data.
Main Methods:
- Developed software to process 4 Megapixel, 8-bit raw frames at 80 Hz.
- Utilized commercial computer graphics hardware for streamlined image processing.
- Implemented algorithms for time-averaged and phase-stepped holograms in off-axis configurations.
Main Results:
- Achieved video-rate image rendering of holograms.
- Demonstrated wide-field imaging of tunable spectral components.
- Validated software with phase-stepped hologram rendering and noncontact surface acoustic wave monitoring.
Conclusions:
- The software provides a versatile platform for real-time holographic image rendering.
- Holography is suitable for video-rate computational laser Doppler imaging in heterodyne configurations.
- The developed system enhances noncontact monitoring and imaging applications.
Related Concept Videos
01:05Doppler Effect - II
4.2K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
4.2K
00:56Doppler Effect - I
4.7K
The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
4.7K
01:26Phase Contrast and Differential Interference Contrast Microscopy
9.4K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
9.4K