Results 21 to 30 of about 502,588 (336)

Data Clustering Methods for Recognition of Endoscopic Images in the Problems of Computer Medical Diagnosis

open access: yesDoklady Belorusskogo gosudarstvennogo universiteta informatiki i radioèlektroniki, 2023
This paper presents the results of the analysis of existing methods for clustering data obtained during endoscopy of a larynx. A modification of the Viola-Jones method for image recognition using the flexible exit criterion is proposed.
R. V. Kozar   +2 more
doaj   +1 more source

Image resolution enhancement using dual-tree complex wavelet transform [PDF]

open access: yes, 2010
In this letter, a complex wavelet-domain image resolution enhancement algorithm based on the estimation of wavelet coefficients is proposed. The method uses a forward and inverse dual-tree complex wavelet transform (DT-CWT) to construct a high-resolution
Tjahjadi, Tardi, Çelik, Turgay
core   +1 more source

Beam-like damage detection methodology using wavelet damage ratio and additional roving mass

open access: yesFracture and Structural Integrity, 2022
Early damage detection plays an essential role in the safe and satisfactory maintenance of structures. This work investigates techniques that use only damaged structure responses.
Juliana C. Santos   +5 more
doaj   +1 more source

Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves [PDF]

open access: yes, 2014
Aims. The wavelet transform has been used as a powerful tool for treating several problems in astrophysics. In this work, we show that the time-frequency analysis of stellar light curves using the wavelet transform is a practical tool for identifying ...
Bravo, J. P.   +4 more
core   +1 more source

The wavelet transforms in Gelfand-Shilov spaces [PDF]

open access: yes, 2015
We describe local and global properties of wavelet transforms of ultradifferentiable functions. The results are given in the form of continuity properties of the wavelet transform on Gelfand-Shilov type spaces and their duals. In particular, we introduce
Pilipovic, Stevan   +3 more
core   +3 more sources

Adjustment and Assessment of the Measurements of Low and High Sampling Frequencies of GPS Real-Time Monitoring of Structural Movement

open access: yesISPRS International Journal of Geo-Information, 2016
Global Positioning System (GPS) structural health monitoring data collection is one of the important systems in structure movement monitoring. However, GPS measurement error and noise limit the application of such systems. Many attempts have been made to
Mosbeh R. Kaloop   +2 more
doaj   +1 more source

Wavelet Estimators in Nonparametric Regression: A Comparative Simulation Study [PDF]

open access: yes, 2001
Wavelet analysis has been found to be a powerful tool for the nonparametric estimation of spatially-variable objects. We discuss in detail wavelet methods in nonparametric regression, where the data are modelled as observations of a signal contaminated ...
Antoniadis, Anestis   +2 more
core   +6 more sources

How do oil price changes affect inflation in Central and Eastern European countries? A wavelet-based Markov switching approach

open access: yesBaltic Journal of Economics, 2019
This paper investigates how oil price changes affect consumer price inflation in eleven Central and Eastern European countries. We use a wavelet-based Markov switching approach in order to distinguish between the effects at different time horizons.
Dejan Živkov   +2 more
doaj   +1 more source

Forecasting daily river flow using an artificial flora–support vector machine hybrid modeling approach (case study: Karkheh Catchment, Iran) [PDF]

open access: yesEnvironmental Resources Research, 2020
In this study, a hybrid support vector machine–artificial flora algorithm method was developed to estimate the flow rate of Karkheh Catchment rivers using daily discharge statistics.
R. Dehghani   +3 more
doaj   +1 more source

Visual Attention-Based Image Watermarking

open access: yesIEEE Access, 2016
Imperceptibility and robustness are two complementary but fundamental requirements of any watermarking algorithm. Low strength watermarking yields high imperceptibility but exhibits poor robustness.
Deepayan Bhowmik   +2 more
doaj   +1 more source

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