Empirically-derived estimates of the complexity of labeling line drawings of polyhedral scenes
Artificial Intelligence
Reconstruction of feature volumes and feature suppression
Proceedings of the seventh ACM symposium on Solid modeling and applications
Removal of blends from boundary representation models
Proceedings of the seventh ACM symposium on Solid modeling and applications
Estimating depth from line drawing
Proceedings of the seventh ACM symposium on Solid modeling and applications
Group Theoretical Methods in Image Understanding
Group Theoretical Methods in Image Understanding
A System for Constructing Boundary Representation Solid Models from a Two-Dimensional Sketch
GMP '00 Proceedings of the Geometric Modeling and Processing 2000
Interpreting a 3D object from a rough 2D line drawing
VIS '90 Proceedings of the 1st conference on Visualization '90
Technical Section: An optimisation-based reconstruction engine for 3D modelling by sketching
Computers and Graphics
Pen-based styling design of 3D geometry using concept sketches and template models
Proceedings of the 2006 ACM symposium on Solid and physical modeling
A sketch-based interface for iterative design and analysis of 3D objects
ACM SIGGRAPH 2007 courses
A template-based reconstruction of plane-symmetric 3D models from freehand sketches
Computer-Aided Design
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 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
A two-stage approach for interpreting line drawings of curved objects
SBM'04 Proceedings of the First Eurographics conference on Sketch-Based Interfaces and Modeling
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Automatic creation of B-rep models of engineering objects from freehand sketches would benefit designers. A subgoal is to take a single line drawing (with hidden lines removed), and from it deduce an initial 3D geometric realisation of the visible part of the object. Junction and line labels, and provisional depth coordinates, are important components of this frontal geometry. Most methods for producing frontal geometry use line labelling, but this takes little or no account of geometry. As a result, the line labels produced can be unreliable.Previously, we proposed an approach which inflates a drawing to produce provisional depth coordinates, and uses these to make deductions about line labels. Even a naïve implementation can outperform previous line labelling methods in certain cases. In this paper, we further enhance this approach. We extend the algorithm to non-isometric-projection drawings, consider improved ways of realising some of the concepts, and also consider how to combine this approach with other labelling techniques to gain the benefits of each.We test our approach using to be drawings of what we consider representative samples of engineering objects; these exemplify difficulties not considered in many previous papers on line labelling. Our results, based on this test set, show that the enhancements result in significant benefits.