Related Experiment Video
Updated: Mar 19, 2026
10:16
Digital Inline Holographic Microscopy DIHM of Weakly-scattering Subjects
Published on: February 8, 2014
12.7K
Zero-order suppression in off-axis digital holography combining optimized non-local means filtering and a variational
Applied Optics
|March 17, 2026
Summary
This study introduces a new variational image decomposition model to suppress zero-order interference in off-axis digital holography. This method improves phase reconstruction accuracy by effectively removing noise and unwanted terms.
Area of Science:
- Optics and Photonics
- Digital Holography
- Image Processing
Background:
- Off-axis digital holography relies on extracting the +1-order spectrum for phase reconstruction.
- Zero-order term interference degrades the accuracy of phase information extraction.
Purpose of the Study:
- To propose a novel variational image decomposition model for effective zero-order term suppression.
- To enhance phase reconstruction accuracy in off-axis digital holography.
Main Methods:
- Constructing an integral image to accelerate the non-local means (NLM) filter for noise reduction.
- Employing an optimized NLM filter to denoise the hologram.
- Utilizing the TV-G algorithm for decomposing the hologram into structural (zero-order) and textural (interference fringes) components.
Main Results:
- Effective suppression of the zero-order term was achieved.
- The textural component, containing interference fringes, was successfully used for phase reconstruction.
- Dynamic phase fluctuation maps of water droplet evaporation were retrieved, demonstrating real-time capability.
Conclusions:
- The proposed variational image decomposition model significantly improves phase reconstruction accuracy by suppressing zero-order interference.
- The method is computationally efficient due to integral image acceleration of the NLM filter.
- The technique is capable of real-time phase retrieval, as shown by water droplet evaporation studies.
Related Concept Videos
01:22Upsampling
684
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
684
01:13Parameters Affecting Nonlinear Elimination: Zero-Order Input, First-Order Absorption and Two-Compartment Model
382
Drugs administered through various routes can lead to nonlinear elimination, resulting in complex pharmacokinetic behaviors crucial to understanding efficacious drug dosing.
When a drug is administered through a constant intravenous infusion and eliminated via nonlinear pharmacokinetics, it follows zero-order input. For example, oral drugs undergo first-order absorption upon administration and are eliminated through nonlinear pharmacokinetics.
In the case of subcutaneously administered drugs,...
When a drug is administered through a constant intravenous infusion and eliminated via nonlinear pharmacokinetics, it follows zero-order input. For example, oral drugs undergo first-order absorption upon administration and are eliminated through nonlinear pharmacokinetics.
In the case of subcutaneously administered drugs,...
382
01:10Reconstruction of Signal using Interpolation
822
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...
822
01:26Phase Contrast and Differential Interference Contrast Microscopy
15.0K
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...
15.0K
01:20Deconvolution
669
Deconvolution, also known as inverse filtering, is the process of extracting the impulse response from known input and output signals. This technique is vital in scenarios where the system's characteristics are unknown, and they must be inferred from the observable signals.
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
Deconvolution involves several mathematical techniques to derive the impulse response. One common approach is polynomial division. In this method, the input and output sequences are treated as coefficients of...
669
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.7K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.7K