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Open AccessArticle

Towards to Optimal Wavelet Denoising Scheme—A Novel Spatial and Volumetric Mapping of Wavelet-Based Biomedical Data Smoothing

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Czech National e-Health Center, University Hospital Olomouc, I. P. Pavlova 185/6, 77900 Olomouc, Czech Republic
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Department of Cybernetics and Biomedical Engineering, VSB-Technical University of Ostrava, FEECS, 70800 Ostrava-Poruba, Czech Republic
3
Department of Computer & Software Engineering, National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(18), 5301; https://doi.org/10.3390/s20185301
Received: 3 August 2020 / Revised: 30 August 2020 / Accepted: 8 September 2020 / Published: 16 September 2020
Wavelet transformation is one of the most frequent procedures for data denoising, smoothing, decomposition, features extraction, and further related tasks. In order to perform such tasks, we need to select appropriate wavelet settings, including particular wavelet, decomposition level and other parameters, which form the wavelet transformation outputs. Selection of such parameters is a challenging area due to absence of versatile recommendation tools for suitable wavelet settings. In this paper, we propose a versatile recommendation system for prediction of suitable wavelet selection for data smoothing. The proposed system is aimed to generate spatial response matrix for selected wavelets and the decomposition levels. Such response enables the mapping of selected evaluation parameters, determining the efficacy of wavelet settings. The proposed system also enables tracking the dynamical noise influence in the context of Wavelet efficacy by using volumetric response. We provide testing on computed tomography (CT) and magnetic resonance (MR) image data and EMG signals mostly of musculoskeletal system to objectivise system usability for clinical data processing. The experimental testing is done by using evaluation parameters such is MSE (Mean Squared Error), ED (Euclidean distance) and Corr (Correlation index). We also provide the statistical analysis of the results based on Mann-Whitney test, which points out on statistically significant differences for individual Wavelets for the data corrupted with Salt and Pepper and Gaussian noise. View Full-Text
Keywords: wavelet transformation; Daubechies wavelet; Symlet wavelet; Coiflet wavelet; spatial and volumetric modeling wavelet transformation; Daubechies wavelet; Symlet wavelet; Coiflet wavelet; spatial and volumetric modeling
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Stanke, L.; Kubicek, J.; Vilimek, D.; Penhaker, M.; Cerny, M.; Augustynek, M.; Slaninova, N.; Akram, M.U. Towards to Optimal Wavelet Denoising Scheme—A Novel Spatial and Volumetric Mapping of Wavelet-Based Biomedical Data Smoothing. Sensors 2020, 20, 5301.

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