The Thresher: Lucky imaging without the waste. Issue 4 (17th February 2022)
- Record Type:
- Journal Article
- Title:
- The Thresher: Lucky imaging without the waste. Issue 4 (17th February 2022)
- Main Title:
- The Thresher: Lucky imaging without the waste
- Authors:
- Hitchcock, J A
Bramich, D M
Foreman-Mackey, D
Hogg, David W
Hundertmark, M - Abstract:
- ABSTRACT: In traditional lucky imaging (TLI), many consecutive images of the same scene are taken with a high frame-rate camera, and all but the sharpest images are discarded before constructing the final shift-and-add image. Here, we present an alternative image analysis pipeline – The Thresher – for these kinds of data, based on online multi-frame blind deconvolution. It makes use of all available data to obtain the best estimate of the astronomical scene in the context of reasonable computational limits; it does not require prior estimates of the point-spread functions in the images, or knowledge of point sources in the scene that could provide such estimates. Most importantly, the scene it aims to return is the optimum of a justified scalar objective based on the likelihood function. Because it uses the full set of images in the stack, The Thresher outperforms TLI in signal-to-noise ratio; as it accounts for the individual-frame PSFs, it does this without loss of angular resolution. We demonstrate the effectiveness of our algorithm on both simulated data and real Electron-Multiplying CCD images obtained at the Danish 1.54-m telescope (hosted by ESO, La Silla). We also explore the current limitations of the algorithm, and find that for the choice of image model presented here, non-linearities in flux are introduced into the returned scene. Ongoing development of the software can be viewed at https://github.com/jah1994/TheThresher .
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 511:Issue 4(2022)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 511:Issue 4(2022)
- Issue Display:
- Volume 511, Issue 4 (2022)
- Year:
- 2022
- Volume:
- 511
- Issue:
- 4
- Issue Sort Value:
- 2022-0511-0004-0000
- Page Start:
- 5372
- Page End:
- 5384
- Publication Date:
- 2022-02-17
- Subjects:
- instrumentation: detectors -- methods: data analysis -- techniques: image processing
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/stac427 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
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British Library HMNTS - ELD Digital store - Ingest File:
- 20731.xml