Luminance calibration of a full sky HDR imaging system using sky scanner measurements

A full sky High Dynamic Range imaging system, based on a Single-Lens Reflex camera with a fisheye lens, has been constructed and calibrated with a sky scanner luminance meter. The method considers the geometrical, spectral, timing and orientation issues between instruments. The calibration data sets...

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Autores: García Ruiz, Ignacio, Sáenz Gamasa, Carlos, Hernández Salueña, Begoña, García Santos, Rafael, Torres Escribano, José Luis
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Universidad Pública de Navarra
Repositorio:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
OAI Identifier:oai:academica-e.unavarra.es:2454/43345
Acceso en línea:https://hdl.handle.net/2454/43345
Access Level:acceso abierto
Palabra clave:HDR imaging
Sky luminance
Sky scanner
Sky imager
Luminance calibration
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spelling Luminance calibration of a full sky HDR imaging system using sky scanner measurementsGarcía Ruiz, IgnacioSáenz Gamasa, CarlosHernández Salueña, BegoñaGarcía Santos, RafaelTorres Escribano, José LuisHDR imagingSky luminanceSky scannerSky imagerLuminance calibrationA full sky High Dynamic Range imaging system, based on a Single-Lens Reflex camera with a fisheye lens, has been constructed and calibrated with a sky scanner luminance meter. The method considers the geometrical, spectral, timing and orientation issues between instruments. The calibration data sets, having nearly simultaneous measurements under stable sky conditions, were obtained from approximately one month of data using selection variables based in the experimental design. For luminance estimation we use the standard RGB combination and a Spectrally Matched Luminance () predictor, matching the spectral response of the instruments. With 738 calibration points having luminances up to 23.6 kcd∕m2, covering 98.5% of the sky luminance range, is linearly correlated with sky scanner measurements with a coefficient of determination 2 = 0.9927 and a Root Mean Squared Error () of 7.7%. gives better results, with 2 = 0.9973 and = 5.3%. With 253 calibration points with luminances up to 12.9 kcd∕m2, comprising 94.1% of the sky luminance range, both predictors clearly improve, with 2 = 0.9964 and = 4.1% in case of and 2 = 0.9982 and = 2.9% in case of .This work was performed in the framework of the IRILURREFLEX, Spain project (ENE2017-86974-R), financed by the Spanish State Research Agency (Agencia Estatal de Investigación, AEI) and the European Regional Development Fund (Fondo Europeo de Desarrollo Regional, FEDER).Solar Energy SocietyZientziakIngeniaritzaInstitute of Smart Cities - ISCInstitute for Advanced Materials and Mathematics - INAMAT2CienciasIngeniería2022info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/zipvideo/mp4https://hdl.handle.net/2454/43345reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarrainstname:Universidad Pública de NavarraInglésinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2017-86974-R© 2022 The Author(s).This is an open access article under the CC BY-NC-ND licensehttps://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:academica-e.unavarra.es:2454/433452026-06-17T12:41:47Z
dc.title.none.fl_str_mv Luminance calibration of a full sky HDR imaging system using sky scanner measurements
title Luminance calibration of a full sky HDR imaging system using sky scanner measurements
spellingShingle Luminance calibration of a full sky HDR imaging system using sky scanner measurements
García Ruiz, Ignacio
HDR imaging
Sky luminance
Sky scanner
Sky imager
Luminance calibration
title_short Luminance calibration of a full sky HDR imaging system using sky scanner measurements
title_full Luminance calibration of a full sky HDR imaging system using sky scanner measurements
title_fullStr Luminance calibration of a full sky HDR imaging system using sky scanner measurements
title_full_unstemmed Luminance calibration of a full sky HDR imaging system using sky scanner measurements
title_sort Luminance calibration of a full sky HDR imaging system using sky scanner measurements
dc.creator.none.fl_str_mv García Ruiz, Ignacio
Sáenz Gamasa, Carlos
Hernández Salueña, Begoña
García Santos, Rafael
Torres Escribano, José Luis
author García Ruiz, Ignacio
author_facet García Ruiz, Ignacio
Sáenz Gamasa, Carlos
Hernández Salueña, Begoña
García Santos, Rafael
Torres Escribano, José Luis
author_role author
author2 Sáenz Gamasa, Carlos
Hernández Salueña, Begoña
García Santos, Rafael
Torres Escribano, José Luis
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Zientziak
Ingeniaritza
Institute of Smart Cities - ISC
Institute for Advanced Materials and Mathematics - INAMAT2
Ciencias
Ingeniería
dc.subject.none.fl_str_mv HDR imaging
Sky luminance
Sky scanner
Sky imager
Luminance calibration
topic HDR imaging
Sky luminance
Sky scanner
Sky imager
Luminance calibration
description A full sky High Dynamic Range imaging system, based on a Single-Lens Reflex camera with a fisheye lens, has been constructed and calibrated with a sky scanner luminance meter. The method considers the geometrical, spectral, timing and orientation issues between instruments. The calibration data sets, having nearly simultaneous measurements under stable sky conditions, were obtained from approximately one month of data using selection variables based in the experimental design. For luminance estimation we use the standard RGB combination and a Spectrally Matched Luminance () predictor, matching the spectral response of the instruments. With 738 calibration points having luminances up to 23.6 kcd∕m2, covering 98.5% of the sky luminance range, is linearly correlated with sky scanner measurements with a coefficient of determination 2 = 0.9927 and a Root Mean Squared Error () of 7.7%. gives better results, with 2 = 0.9973 and = 5.3%. With 253 calibration points with luminances up to 12.9 kcd∕m2, comprising 94.1% of the sky luminance range, both predictors clearly improve, with 2 = 0.9964 and = 4.1% in case of and 2 = 0.9982 and = 2.9% in case of .
publishDate 2022
dc.date.none.fl_str_mv 2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2454/43345
url https://hdl.handle.net/2454/43345
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ENE2017-86974-R
dc.rights.none.fl_str_mv © 2022 The Author(s).This is an open access article under the CC BY-NC-ND license
https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv © 2022 The Author(s).This is an open access article under the CC BY-NC-ND license
https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/zip
video/mp4
dc.publisher.none.fl_str_mv Solar Energy Society
publisher.none.fl_str_mv Solar Energy Society
dc.source.none.fl_str_mv reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
instname:Universidad Pública de Navarra
instname_str Universidad Pública de Navarra
reponame_str Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
collection Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
repository.name.fl_str_mv
repository.mail.fl_str_mv
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