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Reconhecimento de rostos com invariantes de iluminação
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ISBN10: 6207751582
ISBN13: 9786207751587
Publisher: Edicoes Nosso Conhecimento
Published: Jul 3 2024
Pages: 56
Weight: 0.21
Height: 0.13 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786207751587
Publisher: Edicoes Nosso Conhecimento
Published: Jul 3 2024
Pages: 56
Weight: 0.21
Height: 0.13 Width: 6.00 Depth: 9.00
Language: Portuguese
Neste livro, foi efectuado um estudo aprofundado das técnicas de reconhecimento facial invariantes à iluminação mais avançadas e foi proposto um método baseado na fusão de duas técnicas diferentes de extração de caracterÃsticas para ultrapassar as condições adversas de iluminação. O sistema proposto utiliza a normalização da iluminação baseada no gradiente para remover a superioridade da componente de iluminação. Para obter a representação facial insensÃvel à iluminação, é obtido um rácio entre a amplitude do gradiente e a intensidade da imagem original. As caracterÃsticas faciais são extraÃdas utilizando duas técnicas diferentes de extração de caracterÃsticas. O padrão binário local (LBP) é um descritor de textura local muito eficiente, baseado na limiarização dos pixéis numa pequena vizinhança com base no valor do pixel central. O padrão ternário local (LTP) é uma versão modificada do LBP resistente ao ruÃdo. Os vectores de caracterÃsticas fornecidos pelas duas técnicas são fundidos ao nÃvel das caracterÃsticas. Finalmente, a rede neural artificial é utilizada na fase de classificação para efeitos de reconhecimento.
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