Article
Computer Science, Interdisciplinary Applications
Feiyun Xiao
Summary: In this paper, an sEMG denoising algorithm based on empirical wavelet transform (EWT) and improved interval thresholding (IIT) is proposed to effectively eliminate noise interference and achieve the best denoising effect.
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
(2022)
Article
Geochemistry & Geophysics
Zhiyi Zeng, Tianxin Lu, Peng Han, Da Zhang, Xiao-Hui Yang, Yaqian Shi, Ying Chang, Jianzhong Zhang, Rui Dai, Hu Ji
Summary: Microseismic monitoring is crucial for risk assessment in mining, fracturing and excavation. This study develops a new denoising method that combines wavelet coefficient thresholding and pixel connectivity thresholding to improve the signal-to-noise ratio of seismic signals. The proposed method is tested on synthetic and real seismic data, and the results demonstrate its effectiveness and robustness in dealing with noisy data from different acquisition environments and sampling rates.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Da Zhang, Zhiyi Zeng, Yaqian Shi, Ying Chang, Rui Dai, Hu Ji, Peng Han
Summary: The study proposes a denoising method based on wavelet transform to improve the signal-to-noise ratio of mine microseismic data and effectively identify and suppress interfering signals.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Computer Science, Information Systems
Leena Jain, Palwinder Singh
Summary: Speckle noise is a major concern in ultrasound imaging, our novel thresholding rule based on wavelet transform shows better results in reducing speckle, preserving edges, and features.
JOURNAL OF KING SAUD UNIVERSITY-COMPUTER AND INFORMATION SCIENCES
(2022)
Article
Environmental Sciences
Bingzhe Dai, Jie Li, Jiahao Zhou, Yingting Zeng, Wenhao Hou, Junchao Zhang, Yao Wang, Qilin Zhang
Summary: In this paper, a modified empirical wavelet transform (MEWT) method was proposed to process natural lightning signal data. The experimental results demonstrated the adaptive processing capability of the method for lightning signals with different frequencies as well as the noise reduction effect for VLF lightning signals.
Article
Chemistry, Analytical
Shouhua Wang, Shuaihu Wang, Xiyan Sun
Summary: This study proposes a novel method that combines improved complete ensemble empirical mode decomposition with adaptive noise and adaptive wavelet packet threshold denoising to reduce multipath error in GNSS-RTK measurements. The method decomposes the data, selects relevant components, and applies denoising techniques to improve the accuracy of the multipath error correction model. The results demonstrate that the proposed algorithm outperforms other filtering algorithms in terms of multipath error correction.
Article
Computer Science, Artificial Intelligence
Jun-Jie Huang, Pier Luigi Dragotti
Summary: The proposed WINNet method combines the advantages of wavelet-based methods and learning methods for image denoising, containing LINNs, sparse coding denoising, noise estimation networks, etc. By implementing nonlinear redundant transforms, sparse coding, and adaptively adjusting soft thresholds, WINNet method demonstrates strong generalization ability across different noise levels.
IEEE TRANSACTIONS ON IMAGE PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Hassan M. Aljohani
Summary: The paper presents a wavelet shrinkage model with noise variance estimated using exponential distribution, involving an epsilon-contamination prior distribution for robust priors in Bayesian analysis. The proposed method computes posterior mean, applies wavelet methods for signal reconstruction, and compares different approaches through extensive simulation and application on a real-life data set. The main focus is on comparing two different likelihoods - normal distribution and double exponential distribution.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Chemistry, Analytical
Eugenio Brusa, Cristiana Delprete, Simone Gargiuli, Lorenzo Giorio
Summary: Maintenance scheduling is crucial in industry to avoid economic losses caused by excessive downtime. Monitoring systems are used to detect failures, with rolling bearings being a primary cause of such failures. Noise affects vibration signals extracted from bearings, making it difficult to extract and classify features. This article presents an algorithm to optimize denoising parameters using the discrete wavelet transform and thresholding, and evaluates different configurations using a database. The results indicate that the best combination of parameters for denoising is dmey, rigrSURE, and the hard threshold. Further classification is done using principal component analysis and features extracted in the time domain.
Review
Engineering, Biomedical
Syarifah Noor Syakiylla Sayed Daud, Rubita Sudirman
Summary: This review article comprehensively describes the application of the wavelet method in denoising the EEG signal based on recent research. It provides an overview of the basic theory and characteristics of EEG and the wavelet transform method, describes commonly applied wavelet-based methods for EEG dataset denoising, reviews a considerable number of the latest published EEG research works with wavelet applications, discusses challenges in current EEG-based wavelet method research, and recommends alternative solutions to mitigate the issues.
ANNALS OF BIOMEDICAL ENGINEERING
(2022)
Article
Mathematics, Applied
Matteo Dora, Stephane Jaffard, David Holcman
Summary: Wavelet quantile normalization (WQN) is a nonparametric algorithm designed to remove transient artifacts from single-channel EEG in real-time while preserving the continuity of monitoring. The algorithm regularizes the signal by transporting the wavelet coefficient distributions of artifacted epochs into a reference distribution. The WQN algorithm preserves the distribution of wavelet coefficients compared to classical wavelet thresholding methods.
APPLIED AND COMPUTATIONAL HARMONIC ANALYSIS
(2022)
Article
Engineering, Biomedical
J. Ramya, H. C. Vijaylakshmi, Huda Mirza Saifuddin
Summary: The proposed method in this paper utilizes discrete wavelet transform for skin lesion segmentation, effectively addressing the complexities in dermoscopic images. By analyzing color components and using thresholding techniques, the method separates skin lesion region from background with promising results. Experimental comparisons with state-of-the-art methods demonstrate the effectiveness and superiority of the proposed method.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2021)
Article
Computer Science, Theory & Methods
Anterpreet Kaur Bedi, Ramesh Kumar Sunkaria
Summary: A novel wavelet thresholding technique is proposed for despeckling ultrasound images, with performance validated on synthetic and real images. The technique effectively reduces speckle noise while preserving texture information, outperforming other state-of-the-art techniques in terms of edge preservation and structural similarities.
MULTIDIMENSIONAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Automation & Control Systems
Hee-Jun Min, Jae-Won Shim, Hye-Ju Han, Chang-Hee Park, Hye-Young Jung
Summary: This paper discusses the similarities and differences between fuzzy transform and least-squares fuzzy transform, and the simulation results demonstrate that the fuzzy transform outperforms the least-squares fuzzy transform in terms of image reconstruction and denoising.
INTERNATIONAL JOURNAL OF FUZZY SYSTEMS
(2022)
Article
Engineering, Electrical & Electronic
Pallavi Kulkarni, Deepa Madathil
Summary: The proposed method introduces an optimization algorithm based on wavelet decomposition for segmentation, aiming to find the optimal threshold value through evaluating contrast properties and using a nonlinear derivative-free optimizing algorithm. By formulating the optimization task as a maximization problem, the method achieves precise segmentation of the left ventricle and extraction of its contour through iterative processes and user input, demonstrating a higher accuracy of 94% compared to ground truth labels.
INTERNATIONAL JOURNAL OF IMAGING SYSTEMS AND TECHNOLOGY
(2021)
Article
Mathematics, Applied
Mehdi Ashkartizabi, Mina Aminghafari, Adel Mohammadpour
Article
Mathematics, Interdisciplinary Applications
Mitra Ghanbarzadeh, Mina Aminghafari
FLUCTUATION AND NOISE LETTERS
(2016)
Article
Mathematics, Interdisciplinary Applications
Mitra Ghanbarzadeh, Mina Aminghafari
JOURNAL OF TIME SERIES ANALYSIS
(2016)
Article
Mathematics, Interdisciplinary Applications
Ferdos Gorji, Mina Aminghafari
FLUCTUATION AND NOISE LETTERS
(2017)
Article
Engineering, Environmental
Mehdi Ashkartizabi, Mina Aminghafari
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2018)
Article
Pharmacology & Pharmacy
Mohsen Salehi, Adel Mohammadpour, Mohammad Mohammadi, Mina Aminghafari
JOURNAL OF BIOPHARMACEUTICAL STATISTICS
(2018)
Article
Computer Science, Interdisciplinary Applications
Mona Shokripour, Mina Aminghafari
JOURNAL OF STATISTICAL COMPUTATION AND SIMULATION
(2015)
Article
Meteorology & Atmospheric Sciences
Mitra Ghanbarzadeh, Mina Aminghafari
THEORETICAL AND APPLIED CLIMATOLOGY
(2015)
Article
Statistics & Probability
Mitra Ghanbarzadeh, Mina Aminghafari
COMMUNICATIONS IN STATISTICS-THEORY AND METHODS
(2020)
Article
Mathematics, Interdisciplinary Applications
Ferdos Gorji, Mina Aminghafari
FLUCTUATION AND NOISE LETTERS
(2019)
Article
Biology
Ferdos Gorji, Mina Aminghafari
JOURNAL OF AGRICULTURAL BIOLOGICAL AND ENVIRONMENTAL STATISTICS
(2020)
Article
Computer Science, Interdisciplinary Applications
Mohammad Javad Davoudabadi, Daniel Pagendam, Christopher Drovandi, Jeff Baldock, Gentry White
Summary: This paper introduces advanced Bayesian methods for modeling soil carbon sequestration and quantifying uncertainty, focusing on improving efficiency and accuracy in fitting complex soil carbon models. The tutorial provided in this paper will be useful for soil scientists and environmental scientists interested in fitting complex state-space models.
ENVIRONMENTAL MODELLING & SOFTWARE
(2021)
Article
Statistics & Probability
Mohsen Salehi, Adel Mohammadpour, Mohammad Mohammadi, Mina Aminghafari
COMMUNICATIONS IN STATISTICS-SIMULATION AND COMPUTATION
(2019)