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A HIGH-CONTRAST IMAGING ALGORITHM: OPTIMIZED IMAGE ROTATION AND SUBTRACTION
Jiangpei Dou1,2; Deqing Ren1,2,3; Gang Zhao1,2; Xi Zhang1,2; Rui Chen1,2; Yongtian Zhu1,2
2015-03
Source PublicationThe Astrophysical Journal
Volume802Issue:12Pages:1-6
Abstract
Image Rotation and Subtraction (IRS) is a high-contrast imaging technique that can be used to suppress the speckle noise and facilitate the direct detection of exoplanets. IRS is different from Angular Differential Imaging (ADI), in that it will subtract a copy of the image with 180° rotated around its point-spread function (PSF) center, rather than the subtraction of the median of all of the PSF images. Since the planet itself will be rotated to the other side of the
PSF, IRS does not suffer from planet self-subtraction.

In this paper, we have introduced an optimization algorithm to IRS (OIRS), that can provide an extra contrast gain at small angular separations. The performance of OIRS has been demonstrated with ADI data. We then made a comparison of the signal-to-noise ratio (S/N) achieved by algorithms of locally optimized combinations of images and OIRS. Finally, we found that the OIRS algorithm can deliver a better S/N for small angular separations.
KeywordAdaptive Optics Planetary Systems Imaging Image Processing
Subject Area天文技术与方法
Language英语
Document Type期刊论文
Identifierhttp://ir.niaot.ac.cn/handle/114a32/1174
Collection中国科学院南京天文光学技术研究所_期刊论文
天文光谱和高分辨成像技术研究室_期刊论文
Affiliation1.Nanjing Institute of Astronomical Optics & Technology
2.Key Laboratory of Astronomical Optics & Technology,Chinese Academy of Sciences
3.Physics & Astronomy Department, California State University Northridge
Recommended Citation
GB/T 7714
Jiangpei Dou,Deqing Ren,Gang Zhao,et al. A HIGH-CONTRAST IMAGING ALGORITHM: OPTIMIZED IMAGE ROTATION AND SUBTRACTION[J]. The Astrophysical Journal,2015,802(12):1-6.
APA Jiangpei Dou,Deqing Ren,Gang Zhao,Xi Zhang,Rui Chen,&Yongtian Zhu.(2015).A HIGH-CONTRAST IMAGING ALGORITHM: OPTIMIZED IMAGE ROTATION AND SUBTRACTION.The Astrophysical Journal,802(12),1-6.
MLA Jiangpei Dou,et al."A HIGH-CONTRAST IMAGING ALGORITHM: OPTIMIZED IMAGE ROTATION AND SUBTRACTION".The Astrophysical Journal 802.12(2015):1-6.
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