Automatic creation of B-rep models of engineering objects from freehand sketches would benefit designers. One step aims to take a line drawing (with hidden lines removed), and from it deduce an initial three-dimensional (3D) geometric realization of the visible part of the object, including junction and line labels, and depth coordinates. Most methods for producing this frontal geometry use lin...

Graph drawing software relies on a variety of mathematical results, mainly in graph theory , topology , and geometry , as well as computer science techniques, mainly in the areas algorithms and data structures, software engineering , and user interfaces. Many of the core techniques used in automatic graph drawing come from the intersection of mathematics and computer science in combinatorial an...

In the past all engineering students took a drafting class. This involved the use of T-squares, triangles, architectural scales, pounce, eraser shields, bow compasses, pencils, and patience. It gave students a sense of how drawings and diagrams are made and used. As new subjects have come into the curriculum most engineering programs have dropped the drafting requirement, or at least replaced i...

This paper presents an application of fuzzy logic theory to the reconstruction of solid models from engineering drawings. In engineering drawing, two-dimensional (2D) orthographic projections represent an object ambiguously, it requires a numerous amount of combinatorial searches in the process of reconstruction of three-dimensional (3D) drawing. This paper proposes an algorithm which applies f...

XTT is a hybrid design method for rulebased expert systems, combining decision trees and tables. The XTT method provides means for logical formulation of a hierarchical rulebase with explicit inference control. It also has a welldefined visual representation, which is useful in the design process. The paper presents new tools for the conceptual and logical design. The first tool is based is bas...

Image understanding systems rely heavily on a priori knowledge of their application domain, often exploiting techniques developed in the wider field of knowledge-based systems (KBSs). Despite attempts, typified by the KADS/CommonKADS projects, to develop structured knowledge engineering approaches to KBS development, those working in image understanding continue to employ unstructured 1 generat...