Information
- Replaced by: Rautek-2007-SLI
- Publication Type: Technical Report
- Workgroup(s)/Project(s):
- Date: April 2007
- Number: TR-186-2-07-05
- Keywords: Illustrative Visualization, Focus+Context Techniques, Volume Visualization
Abstract
Direct volume rendering techniques map volumetric attributes (e.g. density, gradient magnitude, etc.) to visual styles. Commonly this mapping is specified by a transfer function. The specification of transfer functions is a complex task and requires expert knowledge about the underlying rendering technique. In the case of multiple volumetric attributes and multiple visual styles the specification of the multi-dimensional transfer function becomes more challenging and non-intuitive. We present a novel methodology for the specification of a mapping from several volumetric attributes to multiple illustrative visual styles. We introduce semantic layers that allow a domain expert to specify the mapping in the natural language of the domain. A semantic layer defines the mapping of volumetric attributes to one visual style. Volumetric attributes and visual styles are represented as fuzzy sets. The mapping is specified by rules that are evaluated with fuzzy logic arithmetics. The user specifies the fuzzy sets and the rules without special knowledge about the underlying rendering technique. Semantic layers allow for a linguistic specification of the mapping from attributes to visual styles replacing the traditional transfer function specification.Additional Files and Images
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@techreport{TR-186-2-07-05, title = "Semantic Layers for Illustrative Volume Rendering", author = "Peter Rautek and Stefan Bruckner and Eduard Gr\"{o}ller", year = "2007", abstract = "Direct volume rendering techniques map volumetric attributes (e.g. density, gradient magnitude, etc.) to visual styles. Commonly this mapping is specified by a transfer function. The specification of transfer functions is a complex task and requires expert knowledge about the underlying rendering technique. In the case of multiple volumetric attributes and multiple visual styles the specification of the multi-dimensional transfer function becomes more challenging and non-intuitive. We present a novel methodology for the specification of a mapping from several volumetric attributes to multiple illustrative visual styles. We introduce semantic layers that allow a domain expert to specify the mapping in the natural language of the domain. A semantic layer defines the mapping of volumetric attributes to one visual style. Volumetric attributes and visual styles are represented as fuzzy sets. The mapping is specified by rules that are evaluated with fuzzy logic arithmetics. The user specifies the fuzzy sets and the rules without special knowledge about the underlying rendering technique. Semantic layers allow for a linguistic specification of the mapping from attributes to visual styles replacing the traditional transfer function specification. ", month = apr, number = "TR-186-2-07-05", address = "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria", institution = "Institute of Computer Graphics and Algorithms, Vienna University of Technology ", note = "human contact: technical-report@cg.tuwien.ac.at", keywords = "Illustrative Visualization, Focus+Context Techniques, Volume Visualization", URL = "https://www.cg.tuwien.ac.at/research/publications/2007/TR-186-2-07-05/", }