New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique

Detalhes bibliográficos
Autor(a) principal: Motoki,Akihisa
Data de Publicação: 2007
Outros Autores: Petrakis,Giannis Hans, Soares,Rodrigo, Sichel,Susanna Eleonora, Aires,José Ribeiro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: REM. Revista Escola de Minas (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0370-44672007000100003
Resumo: This paper proposes a new method for modal analyses of centimetric phenocrysts and porphyroblasts using a digital rock image. The dot matrix image of the rock is imported into vectorial draw software as background. The outline of all of the phenocrysts is marked on the overlay by closed vectorial curves and their internal area is painted in black. After this operation, the rock image on the background is deleted and the background is painted in white. The vectorial objects composed of the background and the overlay are exported as a matrix image of BMP format. The percentage of the areas painted in black corresponds to modal abundance of the phenocrysts, and it is calculated by the Wilber colour specification software. This method has high precision in graphic processing. However the translucency of the groundmass causes uncertainness in vectorial phenocryst marking. Therefore, it is recommended for rocks with phenocrysts larger than 5 mm.
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spelling New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification techniqueModal analysesdigital imagephenocrystporphyroblastWilburcolour specificationThis paper proposes a new method for modal analyses of centimetric phenocrysts and porphyroblasts using a digital rock image. The dot matrix image of the rock is imported into vectorial draw software as background. The outline of all of the phenocrysts is marked on the overlay by closed vectorial curves and their internal area is painted in black. After this operation, the rock image on the background is deleted and the background is painted in white. The vectorial objects composed of the background and the overlay are exported as a matrix image of BMP format. The percentage of the areas painted in black corresponds to modal abundance of the phenocrysts, and it is calculated by the Wilber colour specification software. This method has high precision in graphic processing. However the translucency of the groundmass causes uncertainness in vectorial phenocryst marking. Therefore, it is recommended for rocks with phenocrysts larger than 5 mm.Escola de Minas2007-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0370-44672007000100003Rem: Revista Escola de Minas v.60 n.1 2007reponame:REM. Revista Escola de Minas (Online)instname:Escola de Minasinstacron:ESCOLA DE MINAS10.1590/S0370-44672007000100003info:eu-repo/semantics/openAccessMotoki,AkihisaPetrakis,Giannis HansSoares,RodrigoSichel,Susanna EleonoraAires,José Ribeiroeng2007-05-22T00:00:00Zoai:scielo:S0370-44672007000100003Revistahttp://www.scielo.br/remhttps://old.scielo.br/oai/scielo-oai.phpeditor@rem.com.br1807-03530370-4467opendoar:2007-05-22T00:00REM. Revista Escola de Minas (Online) - Escola de Minasfalse
dc.title.none.fl_str_mv New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique
title New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique
spellingShingle New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique
Motoki,Akihisa
Modal analyses
digital image
phenocryst
porphyroblast
Wilbur
colour specification
title_short New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique
title_full New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique
title_fullStr New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique
title_full_unstemmed New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique
title_sort New method of semi-automatic modal analyses for phenocrysts of porphyritic rocks based on quantitative digital colour specification technique
author Motoki,Akihisa
author_facet Motoki,Akihisa
Petrakis,Giannis Hans
Soares,Rodrigo
Sichel,Susanna Eleonora
Aires,José Ribeiro
author_role author
author2 Petrakis,Giannis Hans
Soares,Rodrigo
Sichel,Susanna Eleonora
Aires,José Ribeiro
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Motoki,Akihisa
Petrakis,Giannis Hans
Soares,Rodrigo
Sichel,Susanna Eleonora
Aires,José Ribeiro
dc.subject.por.fl_str_mv Modal analyses
digital image
phenocryst
porphyroblast
Wilbur
colour specification
topic Modal analyses
digital image
phenocryst
porphyroblast
Wilbur
colour specification
description This paper proposes a new method for modal analyses of centimetric phenocrysts and porphyroblasts using a digital rock image. The dot matrix image of the rock is imported into vectorial draw software as background. The outline of all of the phenocrysts is marked on the overlay by closed vectorial curves and their internal area is painted in black. After this operation, the rock image on the background is deleted and the background is painted in white. The vectorial objects composed of the background and the overlay are exported as a matrix image of BMP format. The percentage of the areas painted in black corresponds to modal abundance of the phenocrysts, and it is calculated by the Wilber colour specification software. This method has high precision in graphic processing. However the translucency of the groundmass causes uncertainness in vectorial phenocryst marking. Therefore, it is recommended for rocks with phenocrysts larger than 5 mm.
publishDate 2007
dc.date.none.fl_str_mv 2007-03-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0370-44672007000100003
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0370-44672007000100003
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0370-44672007000100003
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Escola de Minas
publisher.none.fl_str_mv Escola de Minas
dc.source.none.fl_str_mv Rem: Revista Escola de Minas v.60 n.1 2007
reponame:REM. Revista Escola de Minas (Online)
instname:Escola de Minas
instacron:ESCOLA DE MINAS
instname_str Escola de Minas
instacron_str ESCOLA DE MINAS
institution ESCOLA DE MINAS
reponame_str REM. Revista Escola de Minas (Online)
collection REM. Revista Escola de Minas (Online)
repository.name.fl_str_mv REM. Revista Escola de Minas (Online) - Escola de Minas
repository.mail.fl_str_mv editor@rem.com.br
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