Evaluating noise in digitized radiographic images by means of histogram
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of applied oral science (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572006000600005 |
Resumo: | To evaluate the performance of three digital devices regarding the noise added to digital radiographic images containing different optical densities. METHODS: A radiographic image was digitized repeatedly ten times using two scanners (HP 4c/T and HP 5370C) and a digital camera (Nikon 990). A histogram tool measured a mean pixel value and the standard deviation of the region of interest in each image. Both values were used to calculate the image noise at the different optical densities. RESULTS: The noise values found were different for all devices and optical densities. There was a statistically significant difference (p<0.05) between the scanner HP 4c/T and the digital camera regarding the noise values. There was a significant correlation (p<0.05) between the noise values found for the HP 4c/T scanner and the digital camera and between both scanners (p<0.01). CONCLUSION: The noise added to the image was higher for scanner HP 4c/T and less for the digital camera. The noise was higher at the lower optical densities for the scanners. It seems that depending on the equipment and the optical density, a variable amount of noise can be incorporated to the images. |
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Journal of applied oral science (Online) |
repository_id_str |
|
spelling |
Evaluating noise in digitized radiographic images by means of histogramDigital imageRadiographic imageScannersDigital cameraCharge-coupled deviceNoiseTo evaluate the performance of three digital devices regarding the noise added to digital radiographic images containing different optical densities. METHODS: A radiographic image was digitized repeatedly ten times using two scanners (HP 4c/T and HP 5370C) and a digital camera (Nikon 990). A histogram tool measured a mean pixel value and the standard deviation of the region of interest in each image. Both values were used to calculate the image noise at the different optical densities. RESULTS: The noise values found were different for all devices and optical densities. There was a statistically significant difference (p<0.05) between the scanner HP 4c/T and the digital camera regarding the noise values. There was a significant correlation (p<0.05) between the noise values found for the HP 4c/T scanner and the digital camera and between both scanners (p<0.01). CONCLUSION: The noise added to the image was higher for scanner HP 4c/T and less for the digital camera. The noise was higher at the lower optical densities for the scanners. It seems that depending on the equipment and the optical density, a variable amount of noise can be incorporated to the images.Faculdade De Odontologia De Bauru - USP2006-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572006000600005Journal of Applied Oral Science v.14 n.6 2006reponame:Journal of applied oral science (Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S1678-77572006000600005info:eu-repo/semantics/openAccessRubira-Bullen,Izabel Regina FischerEscarpinati,Maurício CunhaSchiabel,HomeroVieira,Marcelo Andrade da CostaRubira,FischerLauris,José Roberto Pereiraeng2007-02-08T00:00:00Zoai:scielo:S1678-77572006000600005Revistahttp://www.scielo.br/jaosPUBhttps://old.scielo.br/oai/scielo-oai.php||jaos@usp.br1678-77651678-7757opendoar:2007-02-08T00:00Journal of applied oral science (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Evaluating noise in digitized radiographic images by means of histogram |
title |
Evaluating noise in digitized radiographic images by means of histogram |
spellingShingle |
Evaluating noise in digitized radiographic images by means of histogram Rubira-Bullen,Izabel Regina Fischer Digital image Radiographic image Scanners Digital camera Charge-coupled device Noise |
title_short |
Evaluating noise in digitized radiographic images by means of histogram |
title_full |
Evaluating noise in digitized radiographic images by means of histogram |
title_fullStr |
Evaluating noise in digitized radiographic images by means of histogram |
title_full_unstemmed |
Evaluating noise in digitized radiographic images by means of histogram |
title_sort |
Evaluating noise in digitized radiographic images by means of histogram |
author |
Rubira-Bullen,Izabel Regina Fischer |
author_facet |
Rubira-Bullen,Izabel Regina Fischer Escarpinati,Maurício Cunha Schiabel,Homero Vieira,Marcelo Andrade da Costa Rubira,Fischer Lauris,José Roberto Pereira |
author_role |
author |
author2 |
Escarpinati,Maurício Cunha Schiabel,Homero Vieira,Marcelo Andrade da Costa Rubira,Fischer Lauris,José Roberto Pereira |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Rubira-Bullen,Izabel Regina Fischer Escarpinati,Maurício Cunha Schiabel,Homero Vieira,Marcelo Andrade da Costa Rubira,Fischer Lauris,José Roberto Pereira |
dc.subject.por.fl_str_mv |
Digital image Radiographic image Scanners Digital camera Charge-coupled device Noise |
topic |
Digital image Radiographic image Scanners Digital camera Charge-coupled device Noise |
description |
To evaluate the performance of three digital devices regarding the noise added to digital radiographic images containing different optical densities. METHODS: A radiographic image was digitized repeatedly ten times using two scanners (HP 4c/T and HP 5370C) and a digital camera (Nikon 990). A histogram tool measured a mean pixel value and the standard deviation of the region of interest in each image. Both values were used to calculate the image noise at the different optical densities. RESULTS: The noise values found were different for all devices and optical densities. There was a statistically significant difference (p<0.05) between the scanner HP 4c/T and the digital camera regarding the noise values. There was a significant correlation (p<0.05) between the noise values found for the HP 4c/T scanner and the digital camera and between both scanners (p<0.01). CONCLUSION: The noise added to the image was higher for scanner HP 4c/T and less for the digital camera. The noise was higher at the lower optical densities for the scanners. It seems that depending on the equipment and the optical density, a variable amount of noise can be incorporated to the images. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-12-01 |
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=S1678-77572006000600005 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572006000600005 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S1678-77572006000600005 |
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 |
Faculdade De Odontologia De Bauru - USP |
publisher.none.fl_str_mv |
Faculdade De Odontologia De Bauru - USP |
dc.source.none.fl_str_mv |
Journal of Applied Oral Science v.14 n.6 2006 reponame:Journal of applied oral science (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Journal of applied oral science (Online) |
collection |
Journal of applied oral science (Online) |
repository.name.fl_str_mv |
Journal of applied oral science (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
||jaos@usp.br |
_version_ |
1748936434351341568 |