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

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Contents Vol 26(1)

doi:10.1071/AS08050

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

Jia Zhu ^A, Zhangqin Zhu ^A, Chong Wang ^A, Zhongfu Ye ^A ^B

^A Institute of Statistical Signal Processing, Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei 230027, China PRC
^B Corresponding author. Email: yezf@ustc.edu.cn





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Publications of the Astronomical Society of Australia 26(1) 69–74 http://dx.doi.org/10.1071/AS08050
Submitted: 24 November 2008 Accepted: 22 December 2008 Published online: 2 April 2009

Abstract

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.

Keywords: techniques: image processing — cosmic rays