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Semantic fitting and reconstruction

: Ullrich, Torsten; Settgast, Volker; Fellner, Dieter W.


ACM journal on computing and cultural heritage 1 (2008), No.2, pp.20
ISSN: 1556-4673
Journal Article
Fraunhofer IGD ()
computer aided geometric design (CAGD); cultural heritage; optimization; algorithm; 3D Model Reconstruction; generative modeling

The current methods to describe the shape of three-dimensional objects can be classified into two groups: methods following the composition of primitives approach and descriptions based on procedural shape representations. As a 3D acquisition device returns an agglomeration of elementary objects (e.g. a laser scanner returns points), the model acquisition pipeline always starts with a composition of primitives. Due to the semantic information carried with a generative description, a procedural model provides valuable metadata that make up the basis for digital library services: retrieval, indexing, and searching.
An important challenge in computer graphics in the field of cultural heritage is to build a bridge between the generative and the explicit geometry description combining both worlds-the accuracy and systematics of generative models with the realism and the irregularity of real-world data. A first step towards a semantically enriched data description is a reconstruction algorithm based on decreasing exponential fitting. This approach is robust towards outliers and multiple dataset mixtures. It does not need a preceding segmentation and is able to fit a generative shape template to a point cloud identifying the parameters of a shape.