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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
22/12/1999 |
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Autoria: |
MASCARENHAS, N. D. A.; SANTOS, S. S. L.; CRUVINEL, P. E. |
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Afiliação: |
UFSCar; EMBRAPA-CNPDIA. |
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Título: |
The use of MAP estimation techniques in the tomographic reconstruction of poisson noise corrupted images. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: SIMPOSIO BRASILEIRO DE COMPUTACAO GRAFICA E PROCESSAMENTO DE IMAGENS, 9., out. 1996, Caxambu, MG. Anais do SIBGRAPI 96. Caxambu: SBC/UFMG, 1996. |
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Páginas: |
p. 197-204. |
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Idioma: |
Inglês |
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Conteúdo: |
The problem of tomographic image reconstruction is important in many areas of applied science and technology. This work presents new methods for the tomographic reconstruction of images with poisson noise corrupted projections. The poisson noise comes from the discrete nature of radiation that characterizes the counting process of particles in the projection set. The reconstruction method is performed by first filtering the noisy projections under the maximum a posteriori criterion and subsequently reconstructing the images through conventional filtering-backprojection methods using the ramp filter. The "a priori" knowledge is incorporated by using several densities, including the Gaussian and densities defined on the non-negative real line. These densities were used to denote the fact that the rates of counting on the projections are non-negative quantities. Experimental results include the filtering of simulated noisy projections and the reconstruction of simulated and real phantoms scanned with a minitomograph scanner for soil science. The obtained results indicate that, by using the MAP criterion, it is possible to obtain a lower mean square error in reconstruction, as compared to conventional methods of filtering-backprojection, with a very small increase in computational effort. |
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Palavras-Chave: |
Agricultural instrumentation; Imagem; Instrumentacao agropecuaria; MAP; Noise; Poison; Reconstrucao; Reconstruction; Techniques; Tecnicas. |
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Thesagro: |
Ruído; Tomografia. |
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Thesaurus NAL: |
tomography. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02249naa a2200313 a 4500
001 1027038
005 1999-12-22
008 1996 bl --- 0-- u #d
100 1 $aMASCARENHAS, N. D. A.
245 $aThe use of MAP estimation techniques in the tomographic reconstruction of poisson noise corrupted images.
260 $c1996
300 $ap. 197-204.
520 $aThe problem of tomographic image reconstruction is important in many areas of applied science and technology. This work presents new methods for the tomographic reconstruction of images with poisson noise corrupted projections. The poisson noise comes from the discrete nature of radiation that characterizes the counting process of particles in the projection set. The reconstruction method is performed by first filtering the noisy projections under the maximum a posteriori criterion and subsequently reconstructing the images through conventional filtering-backprojection methods using the ramp filter. The "a priori" knowledge is incorporated by using several densities, including the Gaussian and densities defined on the non-negative real line. These densities were used to denote the fact that the rates of counting on the projections are non-negative quantities. Experimental results include the filtering of simulated noisy projections and the reconstruction of simulated and real phantoms scanned with a minitomograph scanner for soil science. The obtained results indicate that, by using the MAP criterion, it is possible to obtain a lower mean square error in reconstruction, as compared to conventional methods of filtering-backprojection, with a very small increase in computational effort.
650 $atomography
650 $aRuído
650 $aTomografia
653 $aAgricultural instrumentation
653 $aImagem
653 $aInstrumentacao agropecuaria
653 $aMAP
653 $aNoise
653 $aPoison
653 $aReconstrucao
653 $aReconstruction
653 $aTechniques
653 $aTecnicas
700 1 $aSANTOS, S. S. L.
700 1 $aCRUVINEL, P. E.
773 $tIn: SIMPOSIO BRASILEIRO DE COMPUTACAO GRAFICA E PROCESSAMENTO DE IMAGENS, 9., out. 1996, Caxambu, MG. Anais do SIBGRAPI 96. Caxambu: SBC/UFMG, 1996.
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Embrapa Instrumentação (CNPDIA) |
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