PASCAL - Pattern Analysis, Statistical Modelling and Computational Learning

Thomas Kitching, Adam Amara, Mondeep Gill, Stefan Harmeling, Catherine Heymans, Richard Massey, Barnaby Rowe, Tim Schrabback, Lisa Voigt, Sreekumar Balan, Gary Bernstein, Matthias Bethge, Sarah Bridle, Frederic Courbin, Marc Gentile, Alan Heavens, Michael Hirsch, Reshad Hosseini, Alina Kiessling, Donnacha Kirk, Konrad Kuijken, Rachel Mandelbaum, Baback Moghaddam, Guldariya Rhodes, Bernhard Schölkopf, John Shawe-Taylor, Marina Shmakova, Andy Taylor, Malin Velander, Ludovic van Waerbeke, Dugan Witherick and David Wittman
Annals of Applied Statistics Volume 5, Number 3, pp. 2231-2263, 2011.


GRavitational lEnsing Accuracy Testing 2010 (GREAT10) is a public im- age analysis challenge aimed at the development of algorithms to analyse astronomical images. Specifically the challenge is to measure varying im- age distortions in the presence of a variable convolution kernel, pixelization and noise. This is the second in a series of challenges set to the astronomy, computer science and statistics communities, providing a structured environ- ment in which methods can be improved and tested in preparation for planned astronomical surveys. GREAT10 extends upon previous work by introducing variable fields into the challenge. The ‘Galaxy Challenge’ involves the precise measurement of galaxy shape distortions, quantified locally by two parame- ters called shear, in the presence of a known convolution kernel. Crucially, the convolution kernel and the simulated gravitational lensing shape distor- tion both now vary as a function of position within the images, as is the case for real data. In addition we introduce the ‘Star Challenge’ that concerns the reconstruction of a variable convolution kernel, similar to that in a typical as- tronomical observation. This document details the GREAT10 Challenge for potential participants. Continually updated information is also available from

EPrint Type:Article
Project Keyword:Project Keyword UNSPECIFIED
Subjects:Learning/Statistics & Optimisation
ID Code:7892
Deposited By:Stefan Harmeling
Deposited On:16 March 2012