Inverse Filter
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. A wavelet-based method for power-line interference removal in ECG signals
Abstract Introduction The analysis of electrocardiogram (ECG) signals allows the experts to diagnosis several cardiac disorders. However, the accuracy of such diagnostic depends on the signals quality. In this paper it is proposed a simple method for power-line interference (PLI) removal based on the wavelet decomposition, without the use of thresholding t
Res. Biomed. Eng.. Publicado em: 2018-01
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2. Micro-motion Recognition of Spatial Cone Target Based on ISAR Image Sequences
ABSTRACT The accurate micro-motions recognition of spatial cone target is the foundation of the characteristic parameter acquisition. For this reason, a micro-motion recognition method based on the distinguishing characteristics extracted from the Inverse Synthetic Aperture Radar (ISAR) sequences is proposed in this paper. The projection trajectory formula o
J. Aerosp. Technol. Manag.. Publicado em: 2016-06
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3. Application of H∞ theory to a 6 DOF flight simulator motion base
The purpose of this study is to apply inverse dynamics control for a six degree of freedom flight simulator motion system. Imperfect compensation of the inverse dynamic control is intentionally introduced in order to simplify the implementation of this approach. The control strategy is applied in the outer loop of the inverse dynamic control to counteract th
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2012-06
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4. Geração e avaliação de produtos híbridos CBERS-2B para a identificação de fragmentos de vegetação arbórea / Generation and evaluation of CBERS-2B hybrid products for the identification of arboreal vegetation fragments
This study aims to evaluate two hybrid CBERS-2B products of 2.5 m and 10 m spatial resolution, for mapping forest fragments at Ibitinga Sao Paulo state, Brazil. In order to reduce the blurring effect in CBERS-2B images, the restoration methods Modified Inverse Filtering, Richardson-Lucy, Modified Richardson-Lucy and ones based on POCS theory and neural netwo
Publicado em: 2010
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5. A novel polar-based human face recognition computational model
Motivated by a recently proposed biologically inspired face recognition approach, we investigated the relation between human behavior and a computational model based on Fourier-Bessel (FB) spatial patterns. We measured human recognition performance of FB filtered face images using an 8-alternative forced-choice method. Test stimuli were generated by converti
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-07
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6. Controle de uma plataforma de movimento de um simulador de vôo / Control of a flight simulator motion base
Este trabalho apresenta o desenvolvimento e as análises de técnicas de controle aplicadas a uma base de movimento de um simulador de vôo. Nos primeiros capítulos são abordados aspectos relacionados com a simulação de movimentos. Uma breve descrição da dinâmica da aeronave e o desenvolvimento do algoritmo de movimento (washout filter) são apresenta
Publicado em: 2009
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7. Sobre a velocidade de convergência da filtragem adaptativa IIR. / On the convergence speed of IIR adaptive filtering.
Adaptive filters with infinite impulse response (IIR) can replace with advantages the ones with finite impulse response (FIR). One of these advantages is the reduced number of parameters which leads to a smaller computational complexity giving similar responses. However, the use of adaptive IIR filters has some pratical issue, being the most prominent its sl
Publicado em: 2008
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8. Wavelets, LPC and LS-SVM applied for analysis and identification of pathological voice signals / Wavelets, predição linear e LS-SVM aplicados na análise e classificação de sinais de vozes patológicas
Neste trabalho, foram utilizadas as vantagens da ferramenta matemática de análise temporal e espectral, a transformada wavelet discreta (DWT), além dos coeficientes de predição linear (LPC) e do algoritmo de inteligência artificial, Least Squares Support Vector Machines (LS-SVM), para aplicações em análise de sinais de voz e classificação de vozes
Publicado em: 2008
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9. Design and FPGA prototyping of a H: 264/AVC main profile decoder for HDTV
This paper presents the architecture, design, validation, and hardware prototyping of the main architectural blocks of main profile H.264/AVC decoder, namely the blocks: inverse transforms and quantization, intra prediction, motion compensation and deblocking filter, for a main profile H.264/AVC decoder. These architectures were designed to reach high throug
Journal of the Brazilian Computer Society. Publicado em: 2007-03
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10. Restauração de imagens do satélite Landsat-7. / Restoration of LANDSAT-7 satellite images.
The techniques of image restoration are oriented for the modeling of the degradation and recovery of the original signal that was degraded during the process of image formation. In Remote Sensing, sensor?s nominal spatial resolution, that defines the precision with which details of objects of interest in the image are perceivable, is one of the most importa
Publicado em: 2003
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11. Utilização de filtro de transformada de fourier para a minimização de ruídos em sinais analíticos
Instrumental data always present some noise. The analytical data information and instrumental noise generally has different frequencies. Thus is possible to remove the noise using a digital filter based on Fourier transform and inverse Fourier transform. This procedure enhance the signal/noise ratio and consecutively increase the detection limits on instrume
Química Nova. Publicado em: 2000-10
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12. Sar image textural classification by autorregressive modelling / Classificacao textural de imagens SAR, por modelagem autorregressiva
The aim of this work is to present a method of textural feature extraction by autorregressive modelling to supervised SAR image classification. The classification is performed using a bidimensional processing. The autorregressive parameters are estimated using the Levinson-Durbin algorithm and they are used as the inverse filters elements. After that, two ot
Publicado em: 1998