Machine interpretation of line drawings
Machine interpretation of line drawings
Efficient systematic analysis of occlusion
Pattern Recognition Letters
Emulating the human interpretation of line-drawings as three-dimensional objects
International Journal of Computer Vision
An optimization-based approach to the interpretation of single line drawings as 3D wire frames
International Journal of Computer Vision
SMA '97 Proceedings of the fourth ACM symposium on Solid modeling and applications
Empirically-derived estimates of the complexity of labeling line drawings of polyhedral scenes
Artificial Intelligence
Principles of CAD/CAM/CAE Systems
Principles of CAD/CAM/CAE Systems
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
Interpreting a 3D object from a rough 2D line drawing
VIS '90 Proceedings of the 1st conference on Visualization '90
Sketch based interfaces: early processing for sketch understanding
Proceedings of the 2001 workshop on Perceptive user interfaces
Interpreting Line Drawings of Objects with K-Vertices
GMP '04 Proceedings of the Geometric Modeling and Processing 2004
Making the most of using depth reasoning to label line drawings of engineering objects
SM '04 Proceedings of the ninth ACM symposium on Solid modeling and applications
Decomposition of a visual scene into three-dimensional bodies
AFIPS '68 (Fall, part I) Proceedings of the December 9-11, 1968, fall joint computer conference, part I
A template-based reconstruction of plane-symmetric 3D models from freehand sketches
Computer-Aided Design
An interactive sketching method for 3D object modeling
Proceedings of the 3rd international conference on Digital Interactive Media in Entertainment and Arts
Technical Section: Sketch-based modeling: A survey
Computers and Graphics
Computing - Geometric Modelling, Dagstuhl 2008
Detecting design intent in approximate CAD models using symmetry
Computer-Aided Design
A new algorithm for finding faces in wireframes
Computer-Aided Design
Digitalization of paper sketches integration of the non digital draft
DPPI '11 Proceedings of the 2011 Conference on Designing Pleasurable Products and Interfaces
A sketching interface for 3D modeling of polyhedrons
SBM'06 Proceedings of the Third Eurographics conference on Sketch-Based Interfaces and Modeling
Investigations of the compliance function in 3D reconstruction from 2D line drawings
International Journal of Computer Applications in Technology
3D Object Modeling using Sketches
Information Resources Management Journal
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A tool which can quickly interpret line drawings (with hidden lines removed) of engineering objects as boundary representation CAD models would be of significant benefit in the process of engineering design. Inflation of the drawing to produce a frontal geometry, a geometric realisation of that part of the object visible in the drawing, is an important stage of this process. Previous methods of producing frontal geometries have relied on the technique of line labelling (labelling edges as convex, concave or occluding). Although restricted subsets of the line-labelling problem have known solutions, reliable methods have not been found for the general line-labelling problem, and traditional methods, when adapted to drawings with non-trihedral junctions, are unacceptably slow. Many other papers assume that line labelling is an essential step. Here, we show this is not necessarily true, and that comparable results can be obtained by a novel alternative approach. Firstly, we consider what outputs from line labelling are essential to the production of frontal geometry. Secondly, we investigate by what other means these outputs can be produced. Our work indicates that the only essential output from line labelling for frontal geometry is the determination of which T-junctions in a drawing are occluding and which are non-occluding. This information is required for inflation, and also for detection of symmetry and for constructing hidden topology. Thus, we propose and analyse a new method which, in the absence of line labels, simultaneously inflates a drawing to produce the frontal geometry and attempts to determine whether each T-junction is occluding or not. For drawings of objects with holes or pockets, and for cases where line labelling is particularly unreliable, our new method can provide a better alternative.