Cosmic-Ray Rejection by Laplacian Edge Detection

By P. V. van Dokkum. 2001

1,325 citations recorded by the source corpus.

Conventional algorithms for rejecting cosmic rays in single CCD exposures rely on the contrast between cosmic rays and their surroundings and may produce erroneous results if the point-spread function is smaller than the largest cosmic rays. This paper describes a robust algorithm for cosmic-ray rejection, based on a variation of Laplacian edge detection. The algorithm identifies 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 imaging data, including Hubble Space Telescope Wide Field Planetary Camera 2 images.

Subfields: Computer Vision and Pattern Recognition, Electrical and Electronic Engineering, Radiology, Nuclear Medicine and Imaging

View Paper: https://www.semanticscholar.org/paper/cc459087fd78424cbe86fbd3415aad7cc5881624

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In Computer Vision and Pattern Recognition

In Electrical and Electronic Engineering

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Citations in the corpus

SN 2003du: 480 days in the life of a normal type Ia supernova (2007, neutral): “Laplacian detection algorithm of van Dokkum (2001).”
THE MAN BEHIND THE CURTAIN: X-RAYS DRIVE THE UV THROUGH NIR VARIABILITY IN THE 2013 ACTIVE GALACTIC NUCLEUS OUTBURST IN NGC 2617 (2013, methodology): “All images were reduced following standard procedures and cosmic rays were removed using LACOSMIC (van Dokkum 2001).”
Observations of feedback from radio-quiet quasars - I. Extents and morphologies of ionized gas nebulae (2013, methodology): “We use gfreduce to trim and overscan-subtract science frames, but then we interrupt the standard pipeline to remove the cosmic rays using the spectroscopy version of the L.A.Cosmic software (van Dokkum 2001).”
THE LOW-LUMINOSITY END OF THE RADIUS–LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI (2013, methodology): “Cosmic rays were cleaned with the Laplacian cosmic ray identification package L. A. Cosmic (van Dokkum 2001).”
Galaxy And Mass Assembly (GAMA): Spectroscopic analysis (2013, methodology): “Cosmic rays are cleaned in each object frame using an implementation of Laplacian cosmic ray identification (van Dokkum 2001), and applying clipping thresholds of10 σ in the blue and5σ in the red.”
STELLAR KINEMATICS OF z ∼ 2 GALAXIES AND THE INSIDE-OUT GROWTH OF QUIESCENT GALAXIES, (2012, methodology): “Cosmic rays and bad pixels were identified by LA-Cosmic (van Dokkum 2001), and a bad pixel mask was created.”
X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope (2011, methodology): “When less than three science frames per pointing are given as input, cosmic ray rejection using laplacien edge detection method described in van Dokkum (2001) is applied to each frame, otherwise frames are combined with a Kappa-Sigma clipping.”
The Dark Matter Distribution in the Central Regions of Galaxy Clusters: Implications for Cold Dark Matter (2003, methodology): “A small number of residual cosmic rays were removed with the iraf task lacosmic (van Dokkum 2001).”
PROPER IMAGE SUBTRACTION—OPTIMAL TRANSIENT DETECTION, PHOTOMETRY, AND HYPOTHESIS TESTING (2016, background): “This means that in most cases one can identify particle hits by applying edge-detection algorithms (e.g., van Dokkum 2001), without any modifications, directly on D.”
THE z = 5 QUASAR LUMINOSITY FUNCTION FROM SDSS STRIPE 82 (2012, methodology): “Cosmic rays were idntified and masked using the LACOS routines (van Dokkum 2001).”
HST Photometry of Dwarf Elliptical Galaxies in Coma, and an Explanation for the Alleged Structural Dichotomy between Dwarf and Bright Elliptical Galaxies (2003, methodology): “The HST images were reduced following the standard HST pipeline, combined and cleaned of cosmic-rays using crreject, further cleaned of cosmic rays using LACOS (L.A.COSMIC, van Dokkum 2001), and background subtracted using the wavelet decomposition method by Vikhlinin et al. (1998).”
J-PLUS: The Javalambre Photometric Local Universe Survey (2015, methodology): “For the detection and masking of cosmic ray hits, the pipeline uses an implementation of L.A.Cosmic (van Dokkum 2001).”
EXTRAGALACTIC CHEMICAL ABUNDANCES: DO H ii REGIONS AND YOUNG STARS TELL THE SAME STORY? THE CASE OF THE SPIRAL GALAXY NGC 300 (2009, methodology): “Cosmic rays were removed with the L.A.COSMIC routine (van Dokkum 2001), while standard IRAF2 tasks were used for the spectral extractions, image coadditions and flux calibration (we obtained spectra of the spectrophotometric standards BPM 16274, EG 21, EG 274, LDS 749B and NGC 7293).”
THE M87 BLACK HOLE MASS FROM GAS-DYNAMICAL MODELS OF SPACE TELESCOPE IMAGING SPECTROGRAPH OBSERVATIONS (2013, methodology): “After this initial processing, we usedLA-COSMIC (van Dokkum 2001) to remove cosmic rays and hot pixels.”