Journal
APPLIED OPTICS
Volume 58, Issue 20, Pages 5516-5524Publisher
Optica Publishing Group
DOI: 10.1364/AO.58.005516
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Funding
- Chinese Academy of Sciences (CAS) [KFJ-STS-QYZD-022]
- National Natural Science Foundation of China (NSFC) [61531019]
- National Key Research and Development Program [2017YFC1501700]
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This study develops a novel automatic all-sky imaging system, namely, an all-sky camera (ASC) system, for cloud cover assessment. The proposed system does not require conventional solar occulting devices and can capture complete hemispheric sky images. Cloud detection is performed innovatively using a convolutional neural network model (i.e., the optimized U-Net model). Experiments demonstrate that the optimized U-Net model can effectively detect clouds from sky images. In terms of cloud cover, the estimation results of the ASC system exhibit a high correlation with those obtained via manual observation, thereby indicating the applicability of the ASC system in ground-based cloud observation and analysis. (C) 2019 Optical Society of America
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