首页|How to Coadd Images.Ⅱ.Anti-aliasing and PSF Deconvolution

How to Coadd Images.Ⅱ.Anti-aliasing and PSF Deconvolution

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We have developed a novel method for co-adding multiple under-sampled images that combines the iteratively reweighted least squares and divide-and-conquer algorithms.Our approach not only allows for the anti-aliasing of the images but also enables Point-Spread Function(PSF)deconvolution,resulting in enhanced restoration of extended sources,the highest peak signal-to-noise ratio,and reduced ringing artefacts.To test our method,we conducted numerical simulations that replicated observation runs of the China Space Station Telescope/the VLT Survey Telescope(VST)and compared our results to those obtained using previous algorithms.The simulation showed that our method outperforms previous approaches in several ways,such as restoring the profile of extended sources and minimizing ringing artefacts.Additionally,because our method relies on the inherent advantages of least squares fitting,it is more versatile and does not depend on the local uniformity hypothesis for the PSF.However,the new method consumes much more computation than the other approaches.

methods:analyticaltechniques:image processinggravitational lensing:weak(ISM:)cosmic rays

Lei Wang、Huanyuan Shan、Lin Nie、Dezi Liu、Zhaojun Yan、Guoliang Li、Cheng Cheng、Yushan Xie、Han Qu、Wenwen Zheng、Xi Kang

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Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China

National Basic Science Data Center,Beijing 100190,China

Zhejiang University-Purple Mountain Observatory Joint Research Center for Astronomy Zhejiang University,Hangzhou 310030,China

Shanghai Astronomical Observatory,Shanghai 200030,China

Key Laboratory of Radio Astronomy and Technology,Chinese Academy of Sciences,Beijing 100101,China

University of Chinese Academy of Sciences,Beijing 100049,China

Department of Information Engineering,Wuhan Institute of City,Wuhan 430083,China

South-Western Institute for Astronomy Research,Yunnan University,Kunming 650500,China

The Shanghai Key Lab for Astrophysics,Shanghai Normal University,Shanghai 200234,China

Chinese Academy of Sciences South America Center for Astronomy,National Astronomical Observatories,CAS,Beijing 100101,China

CAS Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

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GHfund AFoundation for Distinguished Young Scholars of Jiangsu ProvinceNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Manned Space ProjectChina Manned Space ProjectChina Manned Space ProjectJoint Funds of the National Natural Science Foundation of ChinaKey Research Program of Frontier Sciences,CASProgram of Shanghai Academic/Technology Research Leaderscience research grants from the China Manned Space Projectscience research grants from the China Manned Space Project

202302017475BK2014005011 973 07011 333 00811 273 06111 825 30311 673 065CMS-CSST-2021-A01CMS-CSST-2021-A03CMS-CSST-2021-B01U1931210ZDBS-LY-7013CMS-CSST-2021-A04CMS-CSST-2021-A07

2024

10.1088/1674-4527/ad2edf

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(4)