Cosmic-Ray Detection Based on Gray-Scale Morphology of Spectroscopic CCD Images

Details Cosmic-Ray Detection Based on Gray-Scale Morphology of Spectroscopic CCD Images Cosmic-Ray Detection Based on Gray-Scale Morphology of Spectroscopic CCD Images

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasa...26...69z&link_type=abstract

Publications of the Astronomical Society of Australia, Volume 26, Issue 1, pp. 69-74.

Astronomy and Astrophysics

Astronomy

Techniques: Image Processing, Cosmic Rays

Scientific paper

Detection of cosmic-ray hits is important because of their disturbing effects on image processing. An algorithm based on gray-scale morphology to detect cosmic-rays in single spectroscopic CCD images is presented in this paper. Based on the morphological differences between cosmic-ray hits and spectra, the operations of erosion and dilation are used to deal with images successively, with appropriate structuring elements. Points of cosmic-ray hits can be detected by analyzing the variation between data pre- and post-operation. Examples of the algorithm are given at the end of this paper, with several groups of both simulated LAMOST images and observed SDSS images to show its performance.

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