Feature Detection in Radio Astronomy using the Circle Hough Transform
C. Hollitt A C and M. Johnston-Hollitt BA School of Engineering and Computer Science, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
B School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
C Corresponding author. Email: chollitt@ieee.org
Publications of the Astronomical Society of Australia 29(3) 309-317 https://doi.org/10.1071/AS11051
Submitted: 15 September 2011 Accepted: 12 January 2012 Published: 13 March 2012
Abstract
While automatic detection of point sources in astronomical images has experienced a great degree of success, less effort has been directed towards the detection of extended and low-surface-brightness features. At present, existing telescopes still rely on human expertise to reduce the raw data to usable images and then to analyse the images for non-pointlike objects. However, the next generation of radio telescopes will generate unprecedented volumes of data making manual data reduction and object extraction infeasible. Without developing new methods of automatic detection for extended and diffuse objects such as supernova remnants, bent-tailed galaxies, radio relics and halos, a wealth of scientifically important results will not be uncovered. In this paper we explore the response of the Circle Hough Transform to a representative sample of different extended circular or arc-like astronomical objects. We also examine the response of the Circle Hough Transform to input images containing noise alone and inputs including point sources.
Keywords: radio continuum: general — techniques: image processing
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