Digital Filters
Mostrando 1-12 de 90 artigos, teses e dissertações.
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1. ELECTRICAL NOISES REDUCTION IN NANOPORES EXPERIMENTS BASED ON CONSENSUS FILTER
Nanopore has developed into an indispensable tool for single molecules experiments, where useful information about the characteristics of DNA/RNA can be obtained from the flowing of ionic current elicited by individual molecules as they traverse a single nanometer-scale aperture. However, due to the relatively high background current noise and low measuremen
Quím. Nova. Publicado em: 20/07/2020
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2. Introducing programmable logic devices in physics laboratories: a practical guide for the implementation of experiments
Modern electronic instrumentation techniques are being introduced in the programs of the Physics and Physical Engineering courses and, in this context, the programmable logic devices play an important role. We present the fundamental steps for the design, development, and validation of systems based on programmable logic devices. Two digital filters have bee
Rev. Bras. Ensino Fís.. Publicado em: 10/01/2020
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3. Comparing the Performance of Ground Filtering Algorithms for Terrain Modeling in a Forest Environment Using Airborne LiDAR Data
ABSTRACT The aim of this study was to evaluate the performance of four ground filtering algorithms to generate digital terrain models (DTMs) from airborne light detection and ranging (LiDAR) data. The study area is a forest environment located in Washington state, USA with distinct classes of land use and land cover (e.g., shrubland, grassland, bare soil, an
Floresta Ambient.. Publicado em: 01/02/2018
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4. Adaptive Wideband Beamforming Based on Digital Delay Filter
Abstract A novel adaptive wideband beamforming method is proposed, where beamforming is achieved by LMS based space-time adaptive filtering algorithm. Conventional broadband beamforming requires desired signal to be incident from the broadside i.e. direction normal to the array. The new method overcome this constraint by make use of digital delay filters whi
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-09
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5. Design of a Microstrip Diplexer and Triplexer Using Open Loop Resonators
Abstract In this paper a novel design of microstrip diplexer and triplexer using open loop resonators is presented. The proposed diplexer if formed by two band-pass filters for the Industrial Scientific Medical (ISM) applications at 5.8 GHz and the WIMAX applications (IEEE 802.16 WiMAX at 3.17 GHz to 4.2 GHz bands). The microstrip triplexer is designed for t
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-06
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6. Segmenting mammographic microcalcifications using a semi-automatic procedure based on Otsu's method and morphological filters
INTRODUCTION: Breast cancer has the second highest world's incidence rate, according to the Brazilian National Cancer Institute (INCa). Clinical examination and mammography are the best methods for early diagnosis. Computer-aided detection (CADe) and computer-aided diagnosis (CADx) systems are developed to improve mammographic diagnosis. Basically, CADx syst
Rev. Bras. Eng. Bioméd.. Publicado em: 2013-12
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7. Performance of digital radiography with enhancement filters for the diagnosis of proximal caries
Enhancement filters are potentially supposed to improve the diagnostic performance of digital images. Thus, the aim of this study was to compare the performance of digital radiography with and without enhancement filters for the detection of induced proximal caries lesions. The total sample consisted of 120 sound human teeth (40 premolars, 80 molars). Enamel
Braz. oral res.. Publicado em: 2013-06
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8. IMPLEMENTAÇÃO DE UM SISTEMA DE TELEDIAGNÓSTICO PARA CLASSIFICAÇÃO DE MASSAS EM IMAGENS MAMOGRÁFICAS USANDO ANÁLISE DE COMPONENTES INDEPENDENTES / IMPLEMENTATION OF A SYSTEM OF TELEDIAGNOSIS FOR CLASSIFICATION OF MASSES IN MAMMOGRAPHIC IMAGES USING INDEPENDENT COMPONENT ANALYSIS
This thesis proposes the modeling and implementation of a telediagnostic system for analysis and detection of lesions in mammographic images based on independent component analysis and support vector machine. The system analyzes images from digital mammography sent over the Internet and provides a diagnostic, indicating the presence of suspicious regions, wh
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/07/2012
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9. Análise da influência vertical de ondas de Rossby longas no Atlântico Sul / Analysis of the Vertical Influence of long Rossby waves in the South Atlantic
Ondas de Rossby longas são ondas de larga escala que se propagam para o oeste com escala espacial de algumas centenas a vários milhares de quilômetros e desempenham um papel crítico na regulação da circulação do oceano. Sua propagação promove deslocamentos verticais da termoclina, muitas vezes da ordem de dezenas de metros, e causa variações de a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/07/2012
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10. Classification of polymers insulators hydrophobicity basead on digital image processing
Although the hydrophobicity is usually an arduous parameter to be determined in the field, it has been pointed out as a good option to monitor aging of polymeric outdoor insulators. Concerning this purpose, digital image processing of photos taken from wet insulators has been the main technique nowadays. However, important challenges on this technique still
Materials Research. Publicado em: 27/03/2012
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11. Contribuições ao problema de separação cega de fontes, com ênfase no estudo de sinais esparsos / Contributions to the problem of blind source separation, with emphasis on the study of sparse signals
Neste trabalho, foi estudado o problema de Separação Cega de Fontes (BSS), com ênfase nos casos chamados de subparametrizados, isto é, em que o número de fontes é maior do que o de misturas. A primeira contribuição proposta foi a de um limitante relacionado ao erro de inversão intrínseco ao problema quando é utilizada uma estrutura linear de separ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/08/2011
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12. Técnicas de equalização de canais de comunicação aplicadas a imagens. / Equalization techniques for communications channels applied to images.
O objetivo da desconvolução autodidata de imagens é reconstruir a imagem original a partir de uma imagem degradada sem usar informação da imagem real ou da função de degradação. O processo de reconstrução é crítico em aplicações em que a imagem original ou suas características estatísticas não são conhecidas. Fazendo um mapeamento da image
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/04/2011