Automated detecting and removing cloud shadows in full-disk solar images

	Automated detecting and removing cloud shadows in full-disk solar images
	Feng, Song 1,2,3; Lin, Jiaben2 ; Yang, Yunfei 1,2; Zhu, Haibo 1; Wang, Feng 1; Ji, Kaifan 1
刊名	NEW ASTRONOMY
	2014-10-01
卷号	32 页码:24-30
关键词	Methods: data analysis Techniques: image processing Sun: general
英文摘要	Sky clouds affect full-disk solar observations significantly. Their shadows obscure the details of solar features in observed images. Cloud-covered images are difficult to be used for further research without pre-processing. We proposed a technique for detecting and removing cloud shadows in full-disk solar images. In the detection procedure, a two-step approach is applied: (1) identifying the deviation of a cloud-covered image from a perfect disk; (2) quantifying the cloud cover by an index that we defined in this paper. In the removal procedure, the transmittance of clouds is measured by comparing the cloud-covered image with a "Quiet Sun" that getting from a normal observation. A restored cloud-free image can be obtained after correcting the absorption by clouds. We tested the procedures using the full-disk solar Ha images of the Global Oscillation Network Group (GONG), and utilized the structural similarity (SSIM) algorithm for evaluating the performance of image restoration. The results demonstrate that both procedures are significant effective, and that the cloud-covered image is restored not only in visual effect but also in intensities of solar features. (C) 2014 Elsevier B.V. All rights reserved.
收录类别	SCI
语种	英语
WOS记录号	WOS:000336874400006
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6552]
专题	国家天文台_太阳物理研究部
作者单位	1.Kunming Univ Sci & Technol, Fac Informat Engn & Automat, Yunnan Key Lab Comp Technol Applicat, Kunming 650500, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 3.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Feng, Song,Lin, Jiaben,Yang, Yunfei,et al. Automated detecting and removing cloud shadows in full-disk solar images[J]. NEW ASTRONOMY,2014,32:24-30.
APA	Feng, Song,Lin, Jiaben,Yang, Yunfei,Zhu, Haibo,Wang, Feng,&Ji, Kaifan.(2014).Automated detecting and removing cloud shadows in full-disk solar images.NEW ASTRONOMY,32,24-30.
MLA	Feng, Song,et al."Automated detecting and removing cloud shadows in full-disk solar images".NEW ASTRONOMY 32(2014):24-30.