A coarse-to-fine strategy for the registration of the multi-wavelength high-resolution solar images

作     者：Rui Wang Zhi Xu Rui Wang;Zhi Xu

作者机构：School of Electronics and InformationXi’an Polytechnic UniversityXi’an 710048China Yunnan Astronomical ObservatoryChinese Academy of SciencesKunming 650011China 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2020年第20卷第7期

页      面：117-126页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：funded by the National Natural Science Foundation of China(NSFC,Grant Nos.11873091 and 61902302) Basic Research on Fund Projects in Yunnan Province(2019FA001) the PhD Scientific Research Start-up Foundation of Xi’an Polytechnic University(107020389) 

主　　题：instrumentation:detectors methods:observational techniques:image processing Sun:general 

摘      要：The registration of multi-wavelength high-resolution solar images is an important task in the research of solar physics. This paper proposed a coarse-to-fine strategy to realize the accurate registration of high-resolution photospheric images and chromospheric images observed by the New Vacuum Solar Telescope(NVST) whose field-of-view is about 2′~ 3′, and the spatial resolution can reach 0.1′′after image reconstruction. In this strategy, the full-disk solar images with relatively lower resolution taken by other space-or ground-based telescopes are taken as transition images, and the Fourier-Merlin transform,Template matching and a local statistical information based algorithm are used in combination. After registration, the geometric transformation between multi-wavelength images of NVST are corrected at the level of sub-arcseconds, including the rotation, scaling and translation relations. Two sets of data observed in active regions(i.e., the NOAA 11982 and the NOAA 12673) are used to illustrate our method step by *** result shows that the registration accuracy can reach less than 1′′. Moreover, this work also has facilitated the combination of high-resolution observations of NVST with the continuum, ultraviolet passbands and magnetic field observations of the Solar Dynamic Observation(SDO), which is highly beneficial to the multi-instrument joint measurement of solar activities.