A Motion compensated filtering approach to remove sunlight flicker in shallow water images

A common problem in video surveys in very shallow waters is the presence of strong light fluctuations, due to sun light refraction. Refracted sunlight casts fast moving patterns, which can significantly degrade the quality of the acquired data. Motivated by the growing need to improve the quality of...

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Detalles Bibliográficos
Autores: Grácias, Nuno Ricardo Estrela, Negahdaripour, Shahriar, Neumann, László, Prados Gutiérrez, Ricard, García Campos, Rafael
Tipo de recurso: artículo
Fecha de publicación:2008
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:10256/2385
Acceso en línea:http://hdl.handle.net/10256/2385
Access Level:acceso abierto
Palabra clave:Imatges -- Processament -- Tècniques digitals
Llum -- Filtres
Vídeo digital
Digital video
Image processing -- Digital techniques
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repository_id_str
spelling A Motion compensated filtering approach to remove sunlight flicker in shallow water imagesGrácias, Nuno Ricardo EstrelaNegahdaripour, ShahriarNeumann, LászlóPrados Gutiérrez, RicardGarcía Campos, RafaelImatges -- Processament -- Tècniques digitalsLlum -- FiltresVídeo digitalDigital videoImage processing -- Digital techniquesA common problem in video surveys in very shallow waters is the presence of strong light fluctuations, due to sun light refraction. Refracted sunlight casts fast moving patterns, which can significantly degrade the quality of the acquired data. Motivated by the growing need to improve the quality of shallow water imagery, we propose a method to remove sunlight patterns in video sequences. The method exploits the fact that video sequences allow several observations of the same area of the sea floor, over time. It is based on computing the image difference between a given reference frame and the temporal median of a registered set of neighboring images. A key observation is that this difference will have two components with separable spectral content. One is related to the illumination field (lower spatial frequencies) and the other to the registration error (higher frequencies). The illumination field, recovered by lowpass filtering, is used to correct the reference image. In addition to removing the sunflickering patterns, an important advantage of the approach is the ability to preserve the sharpness in corrected image, even in the presence of registration inaccuracies. The effectiveness of the method is illustrated in image sets acquired under strong camera motion containing non-rigid benthic structures. The results testify the good performance and generality of the approachIEEE2008info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10256/2385http://hdl.handle.net/10256/2385© OCEANS 2008, 2008, p. 1-7Articles publicats (D-ATC)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)Inglésinfo:eu-repo/semantics/altIdentifier/doi/10.1109/OCEANS.2008.5152111info:eu-repo/semantics/altIdentifier/isbn/978-1-4244-2619-5Tots els drets reservatsinfo:eu-repo/semantics/openAccessoai:recercat.cat:10256/23852026-05-29T05:05:01Z
dc.title.none.fl_str_mv A Motion compensated filtering approach to remove sunlight flicker in shallow water images
title A Motion compensated filtering approach to remove sunlight flicker in shallow water images
spellingShingle A Motion compensated filtering approach to remove sunlight flicker in shallow water images
Grácias, Nuno Ricardo Estrela
Imatges -- Processament -- Tècniques digitals
Llum -- Filtres
Vídeo digital
Digital video
Image processing -- Digital techniques
title_short A Motion compensated filtering approach to remove sunlight flicker in shallow water images
title_full A Motion compensated filtering approach to remove sunlight flicker in shallow water images
title_fullStr A Motion compensated filtering approach to remove sunlight flicker in shallow water images
title_full_unstemmed A Motion compensated filtering approach to remove sunlight flicker in shallow water images
title_sort A Motion compensated filtering approach to remove sunlight flicker in shallow water images
dc.creator.none.fl_str_mv Grácias, Nuno Ricardo Estrela
Negahdaripour, Shahriar
Neumann, László
Prados Gutiérrez, Ricard
García Campos, Rafael
author Grácias, Nuno Ricardo Estrela
author_facet Grácias, Nuno Ricardo Estrela
Negahdaripour, Shahriar
Neumann, László
Prados Gutiérrez, Ricard
García Campos, Rafael
author_role author
author2 Negahdaripour, Shahriar
Neumann, László
Prados Gutiérrez, Ricard
García Campos, Rafael
author2_role author
author
author
author
dc.subject.none.fl_str_mv Imatges -- Processament -- Tècniques digitals
Llum -- Filtres
Vídeo digital
Digital video
Image processing -- Digital techniques
topic Imatges -- Processament -- Tècniques digitals
Llum -- Filtres
Vídeo digital
Digital video
Image processing -- Digital techniques
description A common problem in video surveys in very shallow waters is the presence of strong light fluctuations, due to sun light refraction. Refracted sunlight casts fast moving patterns, which can significantly degrade the quality of the acquired data. Motivated by the growing need to improve the quality of shallow water imagery, we propose a method to remove sunlight patterns in video sequences. The method exploits the fact that video sequences allow several observations of the same area of the sea floor, over time. It is based on computing the image difference between a given reference frame and the temporal median of a registered set of neighboring images. A key observation is that this difference will have two components with separable spectral content. One is related to the illumination field (lower spatial frequencies) and the other to the registration error (higher frequencies). The illumination field, recovered by lowpass filtering, is used to correct the reference image. In addition to removing the sunflickering patterns, an important advantage of the approach is the ability to preserve the sharpness in corrected image, even in the presence of registration inaccuracies. The effectiveness of the method is illustrated in image sets acquired under strong camera motion containing non-rigid benthic structures. The results testify the good performance and generality of the approach
publishDate 2008
dc.date.none.fl_str_mv 2008
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10256/2385
http://hdl.handle.net/10256/2385
url http://hdl.handle.net/10256/2385
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1109/OCEANS.2008.5152111
info:eu-repo/semantics/altIdentifier/isbn/978-1-4244-2619-5
dc.rights.none.fl_str_mv Tots els drets reservats
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Tots els drets reservats
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IEEE
publisher.none.fl_str_mv IEEE
dc.source.none.fl_str_mv © OCEANS 2008, 2008, p. 1-7
Articles publicats (D-ATC)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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