N.º 21 2015 pp. 25-38

Artigo
Sistema multiespectral de imagem com 12 filtros de interferência para mapeamento de pigmentos

Antonino Cosentino

Cultural Heritage Science Open Source, Piazza Cantarella 11, Aci Sant'Antonio, 95025, Italy

antoninocose@gmail.com

Resumo

Os sistemas multiespectrais de imagem são utilizados na análise de obras de arte para mapear e identificar pigmentos e aglutinantes, bem como reintegrações cromáticas. Este trabalho apresenta um sistema sustentável composto por uma câmara CCD monocromática e um conjunto de apenas 12 filtros de interferência caracterizados por diferente espaçamento e largura das bandas ao longo do espectro electromagnético (400-805 nm). É justificada a selecção destes filtros e são discutidos os resultados obtidos quer com um conjunto de 54 pigmentos históricos quer com algumas pinturas a fresco, do século XVIII, da Sicília. De uma forma geral, os filtros usados em sistemas semelhantes são espaçados ao longo do espectro, mas, neste estudo, o comprimento de onda central e a largura da banda dos filtros foram seleccionados de modo a melhorar a representação das características espectrais dos pigmentos históricos. Este sistema permite apenas a reconstituição qualitativa dos espectros de reflectância. Deve ser considerado um instrumento útil para a segmentação de imagens de obras de arte polícromas e identificação de áreas de interesse para exame analítico mais detalhado se forem necessários resultados mais conclusivos.

Palavras-chave

Espectroscopia de reflectância
Reflectância espectral
Imagem multiespectral
Identificação de pigmentos
Conservação de arte

Idioma

Inglês

Título original

Multispectral imaging system using 12 interference filters for mapping pigments

DOI

10.14568/cp2015005

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RIS | Endnote

Citação

História

Recebido: 2015-4-17
Revisto: 2015-5-16
Aceite: 2015-5-24
Online: 2015-6-10
Publicação: 2015-7-24

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Endereço persistente: https://doi.org/10.14568/cp2015005