We present an effective method for speckle noise removal in digital speckle pattern interferometry, which is based on a wave-atom thresholding technique. Wave atoms are a variant of 2D wavelet packets with a parabolic scaling relation and improve the sparse representation of fringe patterns when compared with traditional expansions. The performance of the denoising method is analyzed by using computer-simulated fringes, and the results are compared with those produced by wavelet and curvelet thresholding techniques. An application of the proposed method to reduce speckle noise in experimental data is also presented.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/ol.32.001232 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Cerebral blood flow patterns induced by photoactivation based on laser speckle contrast imaging.
Biomed Opt Express
December 2024
Britton Chance Center for Biomedical Photonics and MoE Key Laboratory for Biomedical Photonics, Advanced Biomedical Imaging Facility, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China.
Neurovascular coupling (NVC) is crucial for maintaining brain function and holds significant implications for diagnosing neurological disorders. However, the neuron type and spatial specificity in NVC remain poorly understood. In this study, we investigated the spatiotemporal characteristics of local cerebral blood flow (CBF) driven by excitatory (VGLUT2) and inhibitory (VGAT) neurons in the mouse sensorimotor cortex.
View Article and Find Full Text PDFHarmonization of anti-nuclear antibody testing (ANA) by indirect immunofluorescence assay: Results from ten years of UK NEQAS external quality assessment.
Clin Chim Acta
December 2024
Laboratory of Clinical Pathology, Azienda Sanitaria Universitaria Integrata, Udine, Italy.
External quality assurance (EQA) programs play a pivotal role in monitoring laboratory practices, allowing each laboratory to evaluate the consistency of results across different methods as well the ability of individual laboratories to compare and improve over time their own performance. The objective of our study was to analyze the UK NEQAS EQA reports for the "Antibodies to Nuclear and Related Antigens" program from 2013 to 2023, to assess the overall level of harmonization of the responses for anti-nuclear antibody (ANA) testing by indirect immunofluorescence (IIF), in terms of both pattern and titer consensus. As a second aim, we analyzed the impact of the introduction in UK NEQAS EQA reports of the International Consensus on ANA Patterns (ICAP) nomenclature and of digital image recognition on the harmonization of the ANA HEp-2 IIF test.
View Article and Find Full Text PDFDetecting subtle subterranean movement via laser speckle imaging.
J Exp Biol
November 2024
School of Physics, Georgia Tech, 837 State Street NW, Atlanta, GA, 30332, USA.
A diversity of organisms live within underground environments. However, visualizing subterranean behavior is challenging because of the opacity of most substrates. We demonstrate that laser speckle imaging, a non-invasive technique resolving nanometer-scale movements, facilitates quantifying biological activity in a granular medium.
View Article and Find Full Text PDFSpeckle noise, mechano-physical noise, and environmental noise are inevitably introduced in digital holographic coherent imaging, which seriously affects the quality of phase maps, and the removal of non-Gaussian statistical noise represented by speckle noise has been a challenging problem. In the past few years, deep learning methods based on convolutional neural networks (CNNs) have made good progress in removing Gaussian noise. However, they tend to fail when these deep networks designed for Gaussian noise removal are used to remove speckle noise.
View Article and Find Full Text PDFNon-invasive laser bio-speckle technique for the study of optical irradiation on plant leaf lamina: Application to monitor salicylic acid modulated response in Zamioculcas zamiifolia.
Biochem Biophys Res Commun
December 2024
International School of Photonics, Cochin University of Science and Technology, Kochi, Kerala, India; Digital University Kerala, India.
Article Synopsis
- * By measuring Inertia Moment (IM) values from Time History of Speckle Patterns (THSP), researchers quantified dynamic activities in the leaves of plants like Philodendron erubescens and Syngonium podophyllum under different light conditions.
- * The research demonstrates a unique response pattern for each plant and aims to develop a non-invasive sensor to monitor plant health and stress responses, particularly under artificial LED lighting and salicylic acid treatment.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!