A phase model for point spread function estimation in ground-based astronomy
Publication in refereed journal

香港中文大學研究人員

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替代計量分析
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其它資訊
摘要In ground-based astronomy, images of objects in outer space are acquired via ground-based telescopes. However, the imaging system is generally interfered by atmospheric turbulence and hence images so acquired are blurred with unknown point spread function (PSF). To restore the observed images, aberration of the wavefront at the telescope's aperture, i.e., the phase, is utilized to derive the PSF. However, the phase is not readily available. Instead, its gradients can be collected by wavefront sensors. Thus the usual approach is to use regularization methods to reconstruct high-resolution phase gradients and then use them to recover the phase in high accuracy. Here, we develop a model that reconstructs the phase directly. The proposed model uses the tight frame regularization and it can be solved efficiently by the Douglas-Rachford alternating direction method of multipliers whose convergence has been well established. Numerical results illustrate that our new model is efficient and gives more accurate estimation for the PSF.
著者Chan RH, Yuan XM, Zhang WX
期刊名稱Science China Mathematics
出版年份2013
月份12
日期1
卷號56
期次12
出版社SCIENCE PRESS
頁次2701 - 2710
國際標準期刊號1674-7283
電子國際標準期刊號1869-1862
語言英式英語
關鍵詞alternating direction method of multipliers; astronomical imaging; phase model; point spread function; tight frame
Web of Science 學科類別Mathematics; MATHEMATICS; Mathematics, Applied; MATHEMATICS, APPLIED

上次更新時間 2020-16-10 於 02:10