The flat-field method based on rotated images for FY-3E/X-EUVI

doi:10.3389/fphy.2022.1048835

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	The flat-field method based on rotated images for FY-3E/X-EUVI
	G. X. Ding; K. Wu; L. P. He; B. Chen and F. Liu
	2022
发表期刊	Frontiers in Physics
ISSN	2296-424X
卷号	10 页码:7
摘要	An algorithm to calculate the flat-field coefficient based on the series of rotated images captured by the solar X-ray and Extreme Ultraviolet Imager (X-EUVI) onboard the Fengyun-3E satellite is proposed in this article. The method includes determination of the solar disk centers and radiuses, calculation of the rotation angles, coordinate transformation to expand the solar disk into rectangles, and derivation of the flat matrix using the KLL algorithm. The accuracy of determination of the solar disk center and radius tested by the Hough gradient method and the least-squares method is at sub-pixel, and the precision of the calculated rotation angle based on the log-polar transform is less than 0.025 & DEG;. Since the X-EUVI rotates relative to the Sun in real time, multiple rotating images can be obtained and used for flat-field calibration at any time, and the tested accuracy is estimated at 0.79-3.42%. This flat-field method will provide reference and support for solar image processing and research.
DOI	10.3389/fphy.2022.1048835
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收录类别	sci
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/66675
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	G. X. Ding,K. Wu,L. P. He,et al. The flat-field method based on rotated images for FY-3E/X-EUVI[J]. Frontiers in Physics,2022,10:7.
APA	G. X. Ding,K. Wu,L. P. He,&B. Chen and F. Liu.(2022).The flat-field method based on rotated images for FY-3E/X-EUVI.Frontiers in Physics,10,7.
MLA	G. X. Ding,et al."The flat-field method based on rotated images for FY-3E/X-EUVI".Frontiers in Physics 10(2022):7.

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