Title:	VISUAL EVALUATION OF DOWNSAMPLING FILTERS IN RESPECT OF THE TOPOLOGY OF SCALAR FIELDS
Author(s):	Martin Kraus
ISBN:	978-972-8924-84-3
Editors:	Yingcai Xiao, Tomaz Amon and Piet Kommers
Year:	2009
Edition:	Single
Keywords:	Volume visualization, downsampling, filtering, topology, scalar field, isosurface
Type:	Full Paper
First Page:	57
Last Page:	64
Language:	English
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Paper Abstract:	In general, downsampling filters for structured volumetric grids cannot preserve the topology of a scalar field; thus, the isosurfaces of the downsampled field will not only geometrically but also topologically differ from the isosurfaces of the original field. Since these topological differences are often more important than geometric deviations, the approximate preservation of topological features is an important feature of some downsampling filters in volume visualization. We apply a recently proposed visualization of the topology of scalar fields to visually evaluate three nonlinear downsampling filters, which have been proposed to preserve more topological features than linear downsampling filters. With the help of this evaluation, we can also determine the most suitable filter to compute previews for the mentioned topology visualization.
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