2024-03-28T12:31:40Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/63222022-11-09T13:59:33Zcom_10259_4393com_10259_5086com_10259_2604com_10259_6164com_10259_4534com_10259.4_106com_10259_6229com_10259_6231com_10259_4266col_10259_4394col_10259_6165col_10259_6230col_10259_6232
Granados López, Diego
García Rodríguez, Ana
García Rodríguez, Sol
Suárez García, Andrés
Diez Mediavilla, Montserrat
Alonso Tristán, Cristina
2022-01-11T10:29:25Z
2022-01-11T10:29:25Z
2021-12
1076-2787
http://hdl.handle.net/10259/6322
10.1155/2021/2636157
Digital sky images are studied for the definition of sky conditions in accordance with the CIE Standard General Sky Guide. Likewise, adequate image-processing methods are analyzed that highlight key image information, prior to the application of Artificial Neural Network classification algorithms. Twenty-two image-processing methods are reviewed and applied to a broad and unbiased dataset of 1500 sky images recorded in Burgos, Spain, over an extensive experimental campaign. The dataset comprises one hundred images of each CIE standard sky type, previously classified from simultaneous sky scanner data. Color spaces, spectral features, and texture filters image-processing methods are applied. While the use of the traditional RGB color space for image-processing yielded good results (ANN accuracy equal to 86.6%), other color spaces, such as Hue Saturation Value (HSV), which may be more appropriate, increased the accuracy of their global classifications. The use of either the green or the blue monochromatic channels improved sky classification, both for the fifteen CIE standard sky types and for simpler classification into clear, partial, and overcast conditions. The main conclusion was that specific image-processing methods could improve ANN-algorithm accuracy, depending on the image information required for the classification problem.
Regional Government of Castilla y León under the “Support Program for Recognized Research Groups of Public Universities of Castilla y León” (BU021G19) and the Spanish Ministry 595 of Science and Innovation under the I + D + i state program “Challenges Research Projects” (Ref. RTI2018-098900-B-I00). Diego Granados López expresses his thanks for economic support from the Junta de Castilla-León (PIRTU Program, ORDEN EDU/556/2019).
application/pdf
eng
Hindawi
Complexity. 2021, V. 2021, art. ID 2636157
https://doi.org/10.1155/2021/2636157
info:eu-repo/grantAgreement/Junta de Castilla y León//BU021G19
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-098900-B-I00/ES/ANALISIS ESPECTRAL DE LA RADIACION SOLAR: APLICACIONES CLIMATICAS, ENERGETICAS Y BIOLOGICAS
Atribución 4.0 Internacional
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
Ingeniería eléctrica
Meteorología
Informática
Electric engineering
Meteorology
Computer science
Pixel-Based Image Processing for CIE Standard Sky Classification through ANN
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion