Related Experiment Video
Updated: Nov 14, 2025
10:16
Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
Published on: February 8, 2014
12.5K
Speckle reduction in digital holography with low-dimensional reconstruction
Applied Optics
|March 10, 2021
Summary
This study introduces a fast, single-shot digital holography method for speckle reduction. The technique effectively minimizes noise in reconstructions, enhancing image quality for potential real-time applications.
Area of Science:
- Optics and Photonics
- Image Processing
Background:
- Speckle noise significantly degrades digital holography reconstruction quality.
- Effective speckle reduction is essential for accurate holographic imaging.
Purpose of the Study:
- To present a novel, efficient single-shot method for speckle noise reduction in digital holography.
- To improve the quality of reconstructed holographic images while preserving original dimensions.
Main Methods:
- Reconstructing subholograms from a single hologram.
- Shuffling and averaging groups of sub-reconstruction images to reduce noise.
- Combining averaged images and applying a mean filter for final noise reduction.
Main Results:
- The proposed method achieves substantial speckle noise reduction.
- Reconstructed image dimensions are preserved.
- The technique is demonstrated to be effective through experimental results.
Conclusions:
- The presented single-shot method offers an easy, fast, and efficient solution for speckle reduction in digital holography.
- The method shows potential for real-time digital holography applications due to its speed and effectiveness.
Related Concept Videos
01:20Downsampling
413
When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
413
01:10Reconstruction of Signal using Interpolation
516
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
516
01:37Super-resolution Fluorescence Microscopy
11.9K
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
11.9K
01:18Aliasing
368
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
368
01:16Confocal Fluorescence Microscopy
19.3K
Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
19.3K