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Discrete wavelet transform

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https://www.readbyqxmd.com/read/29441814/analysis-of-gastric-myoelectrical-activity-from-the-electrogastrogram-signals-based-on-wavelet-transform-and-line-length-feature
#1
Abdullah Al Kafee, Aydin Akan
Electrogastrogram is used for the abdominal surface measurement of the gastric electrical activity of the human stomach. The electrogastrogram technique has significant value as a clinical tool because careful electrogastrogram signal recordings and analyses play a major role in determining the propagation and coordination of gastric myoelectric abnormalities. The aim of this article is to evaluate electrogastrogram features calculated by line length features based on the discrete wavelet transform method to differentiate healthy control subjects from patients with functional dyspepsia and diabetic gastroparesis...
February 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29433839/an-accurate-emotion-recognition-system-using-ecg-and-gsr-signals-and-matching-pursuit-method
#2
Atefeh Goshvarpour, Ataollah Abbasi, Ateke Goshvarpour
BACKGROUND: The purpose of the current study was to examine the effectiveness of Matching Pursuit (MP) algorithm in emotion recognition. METHODS: Electrocardiogram (ECG) and galvanic skin responses (GSR) of 11 healthy students were collected while subjects were listening to emotional music clips. Applying three dictionaries, including two wavelet packet dictionaries (Coiflet, and Daubechies) and discrete cosine transform, MP coefficients were extracted from ECG and GSR signals...
December 2017: Biomedical Journal
https://www.readbyqxmd.com/read/29432116/improved-prosthetic-control-based-on-myoelectric-pattern-recognition-via-wavelet-based-de-noising
#3
Julian Maier, Adam Naber, Max Ortiz-Catalan
Real-time inference of human motor volition has great potential for the intuitive control of robotic devices. Toward this end, myoelectric pattern recognition (MPR) has shown promise in the control of prosthetic limbs. Interfering noise and susceptibility to motion artifacts have hindered the use of MPR outside controlled environments, and thus represent an obstacle for clinical use. Advanced signal processing techniques have been previously proposed to improve the robustness of MPR systems. However, the investigation of such techniques have been limited to offline implementations with long time windows, which makes real-time use unattainable...
February 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29419752/a-novel-computational-method-for-detecting-dna-methylation-sites-with-dna-sequence-information-and-physicochemical-properties
#4
Gaofeng Pan, Limin Jiang, Jijun Tang, Fei Guo
DNA methylation is an important biochemical process, and it has a close connection with many types of cancer. Research about DNA methylation can help us to understand the regulation mechanism and epigenetic reprogramming. Therefore, it becomes very important to recognize the methylation sites in the DNA sequence. In the past several decades, many computational methods-especially machine learning methods-have been developed since the high-throughout sequencing technology became widely used in research and industry...
February 8, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29416100/exploring-an-optimal-wavelet-based-filter-for-cryo-et-imaging
#5
Xinrui Huang, Sha Li, Song Gao
Cryo-electron tomography (cryo-ET) is one of the most advanced technologies for the in situ visualization of molecular machines by producing three-dimensional (3D) biological structures. However, cryo-ET imaging has two serious disadvantages-low dose and low image contrast-which result in high-resolution information being obscured by noise and image quality being degraded, and this causes errors in biological interpretation. The purpose of this research is to explore an optimal wavelet denoising technique to reduce noise in cryo-ET images...
February 7, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29392120/comparative-analysis-of-wavelet-based-feature-extraction-for-intramuscular-emg-signal-decomposition
#6
M Ghofrani Jahromi, H Parsaei, A Zamani, M Dehbozorgi
Background: Electromyographic (EMG) signal decomposition is the process by which an EMG signal is decomposed into its constituent motor unit potential trains (MUPTs). A major step in EMG decomposition is feature extraction in which each detected motor unit potential (MUP) is represented by a feature vector. As with any other pattern recognition system, feature extraction has a significant impact on the performance of a decomposition system. EMG decomposition has been studied well and several systems were proposed, but feature extraction step has not been investigated in detail...
December 2017: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29377805/vlsi-design-of-svm-based-seizure-detection-system-with-on-chip-learning-capability
#7
Lichen Feng, Zunchao Li, Yuanfa Wang
Portable automatic seizure detection system is very convenient for epilepsy patients to carry. In order to make the system on-chip trainable with high efficiency and attain high detection accuracy, this paper presents a very large scale integration (VLSI) design based on the nonlinear support vector machine (SVM). The proposed design mainly consists of a feature extraction (FE) module and an SVM module. The FE module performs the three-level Daubechies discrete wavelet transform to fit the physiological bands of the electroencephalogram (EEG) signal and extracts the time-frequency domain features reflecting the nonstationary signal properties...
February 2018: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/29376882/relative-wave-energy-based-adaptive-neuro-fuzzy-inference-system-model-for-the-estimation-of-depth-of-anaesthesia
#8
V K Benzy, E A Jasmin, Rachel Cherian Koshy, Frank Amal, K P Indiradevi
The advancement in medical research and intelligent modeling techniques has lead to the developments in anaesthesia management. The present study is targeted to estimate the depth of anaesthesia using cognitive signal processing and intelligent modeling techniques. The neurophysiological signal that reflects cognitive state of anaesthetic drugs is the electroencephalogram signal. The information available on electroencephalogram signals during anaesthesia are drawn by extracting relative wave energy features from the anaesthetic electroencephalogram signals...
2018: Journal of Integrative Neuroscience
https://www.readbyqxmd.com/read/29372327/content-based-image-retrieval-by-using-color-descriptor-and-discrete-wavelet-transform
#9
Rehan Ashraf, Mudassar Ahmed, Sohail Jabbar, Shehzad Khalid, Awais Ahmad, Sadia Din, Gwangil Jeon
Due to recent development in technology, the complexity of multimedia is significantly increased and the retrieval of similar multimedia content is a open research problem. Content-Based Image Retrieval (CBIR) is a process that provides a framework for image search and low-level visual features are commonly used to retrieve the images from the image database. The basic requirement in any image retrieval process is to sort the images with a close similarity in term of visually appearance. The color, shape and texture are the examples of low-level image features...
January 25, 2018: Journal of Medical Systems
https://www.readbyqxmd.com/read/29364122/a-new-adaptive-gamma-correction-based-algorithm-using-dwt-svd-for-non-contrast-ct-image-enhancement
#10
Fathi Kallel, Ahmed Ben Hamida
The performances of medical image processing techniques, in particular CT scans, are usually affected by poor contrast quality introduced by some medical imaging devices. This suggests the use of contrast enhancement methods as a solution to adjust the intensity distribution of the dark image. In this paper, an advanced adaptive and simple algorithm for dark medical image enhancement is proposed. This approach is principally based on adaptive gamma correction using discrete wavelet transform with singular-value decomposition (DWT-SVD)...
December 2017: IEEE Transactions on Nanobioscience
https://www.readbyqxmd.com/read/29363219/microscopic-abnormality-classification-of-cardiac-murmurs-using-anfis-and-hmm
#11
H M Fahad, M Usman Ghani Khan, Tanzila Saba, Amjad Rehman, Sajid Iqbal
Auscultation of heart dispenses identification of the cardiac valves. An electronic stethoscope is used for the acquisition of heart murmurs that is further classified into normal or abnormal murmurs. The process of heart sound segmentation involves discrete wavelet transform to obtain individual components of the heart signal and its separation into systole and diastole intervals. This research presents a novel scheme to develop a semi-automatic cardiac valve disorder diagnosis system. Accordingly, features are extracted using wavelet transform and spectral analysis of input signals...
January 23, 2018: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29342848/a-voltammetric-electronic-tongue-for-the-resolution-of-ternary-nitrophenol-mixtures
#12
Andreu González-Calabuig, Xavier Cetó, Manel Del Valle
This work reports the applicability of a voltammetric sensor array able to quantify the content of 2,4-dinitrophenol, 4-nitrophenol, and picric acid in artificial samples using the electronic tongue (ET) principles. The ET is based on cyclic voltammetry signals, obtained from an array of metal disk electrodes and a graphite epoxy composite electrode, compressed using discrete wavelet transform with chemometric tools such as artificial neural networks (ANNs). ANNs were employed to build the quantitative prediction model...
January 13, 2018: Sensors
https://www.readbyqxmd.com/read/29328975/active-elimination-of-radio-frequency-interference-for-improved-signal-to-noise-ratio-for-in-situ-nmr-experiments-in-strong-magnetic-field-gradients
#13
M Ibrahim, C I Pardi, T W C Brown, P J McDonald
Improvement in the signal-to-noise ratio of Nuclear Magnetic Resonance (NMR) systems may be achieved either by increasing the signal amplitude or by decreasing the noise. The noise has multiple origins - not all of which are strictly "noise": incoherent thermal noise originating in the probe and pre-amplifiers, probe ring down or acoustic noise and coherent externally broadcast radio frequency transmissions. The last cannot always be shielded in open access experiments. In this paper, we show that pulsed, low radio-frequency data communications are a significant source of broadcast interference...
January 7, 2018: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/29310296/voltammetric-electronic-tongue-to-identify-brett-character-in-wines-on-site-quantification-of-its-ethylphenol-metabolites
#14
Andreu González-Calabuig, Manel Del Valle
This work reports the applicability of a voltammetric sensor array able to evaluate the content of the metabolites of the Brett defect: 4-ethylphenol, 4-ethylguaiacol and 4-ethylcatechol in spiked wine samples using the electronic tongue (ET) principles. The ET used cyclic voltammetry signals, obtained from an array of six graphite epoxy modified composite electrodes; these were compressed using Discrete Wavelet transform while chemometric tools, among these artificial neural networks (ANNs), were employed to build the quantitative prediction model...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29251059/epileptic-seizure-detection-using-dwt-based-approximate-entropy-shannon-entropy-and-support-vector-machine-a-case-study
#15
A Sharmila, Suman Aman Raj, Pandey Shashank, P Mahalakshmi
In this work, we have used a time-frequency domain analysis method called discrete wavelet transform (DWT) technique. This method stand out compared to other proposed methods because of its algorithmic elegance and accuracy. A wavelet is a mathematical function based on time-frequency analysis in signal processing. It is useful particularly because it allows a weak signal to be recovered from a noisy signal without much distortion. A wavelet analysis works by analysing the image and converting it to mathematical function which is decoded by the receiver...
December 18, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29215051/a-web-based-gps-system-for-displacement-monitoring-and-failure-mechanism-analysis-of-reservoir-landslide
#16
Yuanyao Li, Jinsong Huang, Shui-Hua Jiang, Faming Huang, Zhilu Chang
It is important to monitor the displacement time series and to explore the failure mechanism of reservoir landslide for early warning. Traditionally, it is a challenge to monitor the landslide displacements real-timely and automatically. Globe Position System (GPS) is considered as the best real-time monitoring technology, however, the accuracies of the landslide displacements monitored by GPS are not assessed effectively. A web-based GPS system is developed to monitor the landslide displacements real-timely and automatically in this study...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29205225/using-the-discrete-wavelet-transform-in-assessing-the-effectiveness-of-rehabilitation-in-patients-after-acl-reconstruction
#17
Adam Czaplicki, Wiesława Kuniszyk-Jóźkowiak, Janusz Jaszczuk, Marta Jarocka, Jacek Walawski
PURPOSE: The purpose of the current study was to assess the effectiveness of rehabilitation in patients after anterior cruciate ligament reconstruction (ACLR) using a wavelet analysis of the torque-time curve patterns of the extensors of the affected knee. The analysis aimed at the quantitative evaluation of irregularities in these torque-time patterns. METHODS: The study involved a group of 22 men who had had ACL reconstruction. The torque-time characteristics were recorded 3, 6 and 12 months after the surgery by an isokinetic dynamometer...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/29188743/a-case-study-on-discrete-wavelet-transform-based-hurst-exponent-for-epilepsy-detection
#18
Saiby Madan, Kajri Srivastava, A Sharmila, P Mahalakshmi
Epileptic seizures are manifestations of epilepsy. Careful analysis of EEG records can provide valuable insight and improved understanding of the mechanism causing epileptic disorders. The detection of epileptic form discharges in EEG is an important component in the diagnosis of epilepsy. As EEG signals are non-stationary, the conventional frequency and time domain analysis does not provide better accuracy. So, in this work an attempt has been made to provide an overview of the determination of epilepsy by implementation of Hurst exponent (HE)-based discrete wavelet transform techniques for feature extraction from EEG data sets obtained during ictal and pre ictal stages of affected person and finally classifying EEG signals using SVM and KNN Classifiers...
November 30, 2017: Journal of Medical Engineering & Technology
https://www.readbyqxmd.com/read/29175566/quality-enhancement-of-ultrasonic-tofd-signals-from-carbon-steel-weld-pad-with-notches
#19
K Manjula, K Vijayarekha, B Venkatraman
Welding is an integral part of component fabrication in industry. Even though the science and art of welding are more than 100 years old, defects continue to occur during welding. Codes of practice require that the welds be tested and evaluated. Conventionally ultrasonic testing has been widely applied in industry for the detection and evaluation of the flaws/defects in the weldments. With advances in sensor and signal analysis technologies, the last two decades have seen extensive developments in the field of ultrasonic testing...
November 6, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29154143/investigation-of-various-factors-influencing-raman-spectra-interpretation-with-the-use-of-likelihood-ratio-approach
#20
Aleksandra Michalska, Agnieszka Martyna, Grzegorz Zadora
The main aim of this study was to verify whether selected analytical parameters may affect solving the comparison problem of Raman spectra with the use of the likelihood ratio (LR) approach. Firstly the LR methodologies developed for Raman spectra of blue automotive paints obtained with the use of 785nm laser source (results published by the authors previously) were implemented for good quality spectra recorded for these paints with the use of 514.5nm laser source. For LR models construction two types of variables were used i...
November 3, 2017: Forensic Science International
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