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Listar por palabra clave "Wavelets"

Mostrando ítems 1-14 de 14

2D biological representations with reduced speckle obtained from two perpendicular ultrasonic arrays

Rodríguez-Hernández, Miguel A.; Gomez Sacristan, Ángel; Sempere Paya, Víctor Miguel (IOS Press, 2016)

[EN] Ultrasound diagnosis is a widely used medical tool. Among the various ultrasound techniques, ultrasonic imaging is particularly relevant. This paper presents an improvement to a two-dimensional (2D) ultrasonic system ...
A phenomenological model for sonic crystals based on artificial neural networks

Fuster García, Elíes; Romero García, Vicente; Sánchez Pérez, Juan Vicente; García Raffi, Luis Miguel; Sánchez Pérez, Enrique Alfonso (Acoustical Society of America, 2006-08)

[EN] A phenomenological model that simulates the acoustic attenuation behavior of sonic crystals is developed in this paper. The input of the model is a set of parameters that characterizes each experimental setup, and ...
Algoritmo robusto para el diagnóstico de fallas eléctricas en el motor de inducción trifásico basado en herramientas espectrales y ondeletas

Villalobos Piña, Francisco Javier; Álvarez Salas, Ricardo (Universitat Politècnica de València, 2015-07-10)

[EN] This work present a group of tools based on the fast Fourier transform (FFT) and Haar, Daubechies and Coiﬂet discrete wavelet transform (DWT), using the Park's instantaneous space phasor module (ISP) of the three phase ...
Applying a Genetic Algorithm Solution to Improve Compression of Wavelet Coefficient Sign

Martí-Campoy, Antonio; López, Otoniel; Rodríguez-Ballester, Francisco; Perez Malumbres, Manuel Jose (Springer, 2015-06-10)

Discrete Wavelet Transform has been widely used in image compression because it is able to compact frequency and spatial localization of image energy into a small fraction of coefficients. In recent years coefficient sign ...
Cambios en la producción primaria bruta (GPP) de la vegetación natural en la Comunidad Valenciana (2001-2018)

Martínez, Beatriz; Sánchez-Ruiz, Sergio; Campos-Taberner, Manuel; García-Haro, Francisco Javier; Gilabert, María Amparo (Universitat Politècnica de València, 2023-01-30)

[EN] This work analyzes the vegetation changes in the Comunidad Valenciana observed during the period 2001-2018, using the daily GPP (Gross Primary Production) time series at 1-km spatial resolution derived from Earth ...
Evaluación de Sistemas NOMA para Comunicaciones 5G

Rodríguez García, Victor Manuel (Universitat Politècnica de València, 2020-12-22)

[ES] La tecnología denominada 5G va a implantarse próximamente para los sistemas de telefonía móvil. El acceso NOMA es una de las novedades que introduce la tecnología 5G frente a generaciones anteriores. En este trabajo ...
Identificación de pólenes utilizando técnicas de visión por computador

Peinado Sanchis, Felipe Ignacio (Universitat Politècnica de València, 2015-09-29)

[ES] En este trabajo se evalúa la viabilidad de un sistema automático de clasificación de pólenes en imágenes de miel obtenidas con microscopio basado en un modelo que usa como discriminantes atributos derivados del ...
Modelado y caracterización de señales cerebrales mediante wavelets y proyección sobre variables latentes

González Cebrián, Alba (Universitat Politècnica de València, 2016-07-12)

[ES] En el presente trabajo se ha realizado la caracterización y clasificación de trastornos del sueño a partir de los EEGs registrados en Polisomnografías. Mediante la Transformada Wavelet Discreta, se han obtenido ...
N-way modeling for wavelet filter determination in Multivariate Image Analysis

Prats-Montalbán, José Manuel; Cocchi, Marina; Ferrer Riquelme, Alberto José (Wiley, 2015-06)

[EN] When trying to analyze spatial relationships in image analysis, wavelets appear as one of the state-of-the-art tools. However, image analysis is a problem-dependent issue, and different applications might require ...
Noise reduction using wavelet cycle spinning: analysis of useful periodicities in the z-transform domain

Rodríguez-Hernández, Miguel A.; San Emeterio, Jose L. (Springer Verlag (Germany), 2016-03)

Cycle spinning (CS) and a'trous algorithms are different implementations of the undecimated wavelet transform (UWT). Both algorithms can be used for UWT and even though the resulting wavelet coefficients are different, ...
Shift Selection Influence in Partial Cycle Spinning Denoising of Biomedical Signals

Rodríguez-Hernández, Miguel A. (Elsevier, 2016-04)

Denoising of biomedical signals using wavelet transform is a widely used technique. The use of undecimated wavelet transform (UWT) assures better denoising results but implies a higher complexity than discrete wavelet ...
Statistical Process Control based on Multivariate Image Analysis: A new proposal for monitoring and defect detection

Prats Montalbán, José Manuel; Ferrer Riquelme, Alberto José (Elsevier, 2014-12-04)

The monitoring, fault detection and visualization of defects are a strategic issue for product quality. This paper presents a novel methodology based on the integration of textural Multivariate image analysis (MIA) and ...
Wavelet Cycle Spinning Denoising of NDE Ultrasonic Signals Using a Random Selection of Shifts

San Emeterio Prieto, José Luis; Rodríguez-Hernández, Miguel A. (Springer Verlag (Germany), 2015-03)

Wavelets are a powerful tool for signal and image denoising. Most of the denoising applications in different fields were based on the thresholding of the discrete wavelet transform (DWT) coefficients. Nevertheless, DWT ...
Wavelet-based 2D fusing of ultrasonic pulse-echo traces measured from two arrays radiating orthogonal beams

Rodríguez-Hernández, Miguel A.; Ramos, Antonio; San Emeterio Prieto, José Luis (IOP Publishing: Hybrid Open Access, 2011-10)

Ultrasonic measurements using orthogonal collimated beams provide both complementary and redundant information about internal parts of pieces or structures being tested, which must be fused. In this paper, a new wavelet-based ...