Feature Extraction from Whole-Sky Ground-Based Images for Cloud-Type Recognition
dc.contributor.author
dc.date.accessioned
2013-10-17T08:11:25Z
dc.date.available
2013-10-17T08:11:25Z
dc.date.issued
2008
dc.identifier.issn
0739-0572
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dc.description.abstract
Several features that can be extracted from digital images of the sky and that can be useful for cloud-type classification of such images are presented. Some features are statistical measurements of image texture, some are based on the Fourier transform of the image and, finally, others are computed from the image where cloudy pixels are distinguished from clear-sky pixels. The use of the most suitable features in an automatic classification algorithm is also shown and discussed. Both the features and the classifier are developed over images taken by two different camera devices, namely, a total sky imager (TSI) and a whole sky imager (WSC), which are placed in two different areas of the world (Toowoomba, Australia; and Girona, Spain, respectively). The performance of the classifier is assessed by comparing its image classification with an a priori classification carried out by visual inspection of more than 200 images from each camera. The index of agreement is 76% when five different sky conditions are considered: clear, low cumuliform clouds, stratiform clouds (overcast), cirriform clouds, and mottled clouds (altocumulus, cirrocumulus). Discussion on the future directions of this research is also presented, regarding both the use of other features and the use of other classification techniques
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
American Meteorological Society
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Reproducció digital del document publicat a: http://dx.doi.org/10.1175/2007JTECHA959.1
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© Journal of Atmospheric and Oceanic Technology, 2008, vol. 25, p. 3-14
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Articles publicats (D-F)
dc.rights
Tots els drets reservats
dc.subject
dc.title
Feature Extraction from Whole-Sky Ground-Based Images for Cloud-Type Recognition
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/openAccess
dc.embargo.terms
Cap
dc.type.version
info:eu-repo/semantics/publishedVersion
dc.identifier.doi
dc.identifier.idgrec
010795
dc.identifier.eissn
1520-0426