Cosmic-ray rejection by Laplacian edge detection

Authors
Citation
Pg. Van Dokkum, Cosmic-ray rejection by Laplacian edge detection, PUB AST S P, 113(789), 2001, pp. 1420-1427
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
ISSN journal
0004-6280 → ACNP
Volume
113
Issue
789
Year of publication
2001
Pages
1420 - 1427
Database
ISI
SICI code
0004-6280(200111)113:789<1420:CRBLED>2.0.ZU;2-R
Abstract
Conventional algorithms for rejecting cosmic rays in single CCD exposures r ely on the contrast between cosmic rays and their surroundings and may prod uce erroneous results if the point-spread function is smaller than the larg est cosmic rays. This paper describes a robust algorithm for cosmic-ray rej ection, based on a variation of Laplacian edge detection. The algorithm ide ntifies cosmic rays of arbitrary shapes and sizes by the sharpness of their edges and reliably discriminates between poorly sampled point sources and cosmic rays. Examples of its performance are given for spectroscopic and im aging data, including Hubble Space Telescope Wide Field Planetary Camera 2 images.