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2007MNRAS.380..551P - Mon. Not. R. Astron. Soc., 380, 551-570 (2007/September-2)
A cosmic watershed: the WVF void detection technique.
PLATEN E., VAN DE WEYGAERT R. and JONES B.J.T.
Abstract (from CDS):
In this study we present an objective void finder technique which involves a minimum of assumptions about the scale, structure and shape of voids. Our void finding method, the watershed void finder (WVF), is based upon the watershed transform, a well-known technique for the segmentation of images. Importantly, the technique has the potential to trace the existing manifestations of a void hierarchy. The basic watershed transform is augmented by a variety of correction procedures to remove spurious structure resulting from sampling noise.
This study contains a detailed description of the WVF. We demonstrate how it is able to trace and identify, relatively parameter free, voids and their surrounding (filamentary and planar) boundaries. We test the technique on a set of kinematic Voronoi models, heuristic spatial models for a cellular distribution of matter. Comparison of the WVF segmentations of low-noise and high-noise Voronoi models with the quantitatively known spatial characteristics of the intrinsic Voronoi tessellation shows that the size and shape of the voids are successfully retrieved. WVF manages to even reproduce the full void size distribution function.
Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s): methods: data analysis - methods: numerical - cosmology: theory - large-scale structure of Universe
Simbad objects: 1
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