Constraints Between Distant Lines in the Labelling of Line Drawings of Polyhedral Scenes
International Journal of Computer Vision
Local Image Features Resulting from 3-Dimensional Geometric Features, Illumination, and Movement: I
International Journal of Computer Vision
Frontal geometry from sketches of engineering objects: is line labelling necessary?
Computer-Aided Design
A survey on geometrical reconstruction as a core technology to sketch-based modeling
Computers and Graphics
A new algorithm for finding faces in wireframes
Computer-Aided Design
A complete label set for 3D-sketch labeling
FSKD'09 Proceedings of the 6th international conference on Fuzzy systems and knowledge discovery - Volume 5
On the evolution of geometrical reconstruction as a core technology to sketch-based modeling
SBM'04 Proceedings of the First Eurographics conference on Sketch-Based Interfaces and Modeling
Can machines interpret line drawings?
SBM'04 Proceedings of the First Eurographics conference on Sketch-Based Interfaces and Modeling
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As part of the goal of automatic creation of B-rep modelsof engineering objects from freehand sketches, we seekto take a single line drawing (with hidden lines removed),and from it deduce an initial 3D geometric realisation ofthe visible part of the drawn object. Junction and line labels,and provisional depth coordinates, are key parts of thisfrontal geometry.Many methods for producing frontal geometry onlywork correctly for drawings of trihedral objects. However,non-trihedral K-vertices commonly occur in engineeringobjects. We analyse the performance of a line-labellingmethod applied to K-vertices, and show why methods ignoringgeometric considerations are inadequate.We give a new approach which produces both junctionlabels and provisional depth coordinates without any priorknowledge. Our results show that even a naïve implementationoutperforms previous methods.