In this paper, we analyze the state of the art in interpretation of engineering drawings, both from a methodological point of view and from the perspective of the applications. We try to emphasize where techniques are mature, where they need further maturing, and where we still have open challenges. Special attention is given to the progress in the last two years, i.e. to the evolution in the f...

In this paper, we study the segmentation of sketched engineering drawings into a set of straight and curved segments. Our immediate objective is to produce a benchmarking method for segmentation algorithms. The criterion is to minimise the differences between what the algorithm detects and what human beings perceive. We have created a set of sketched drawings and have asked people to segment th...

A novel engineering drawings feature extraction and retrieval method is proposed in this paper which comprehensively utilizes density feature and improved moment invariants. This paper defines the density feature which can reflect the spatial information of objects in the engineering drawings and presents its extraction method. Improved moment invariants can describe the shape information of th...

Drawing graphs is an important problem that combines avors of computational geometry and graph theory. Applications can be found in a variety of areas including circuit layout, network management, software engineering, and graphics. The main contributions of this paper can be summarized as follows: We devise a model for dynamic graph algorithms, based on performing queries and updates on an imp...

Geometric dimensioning and tolerancing is a symbolic language used on engineering drawings and computer generated three-dimensional solid models for explicitly describing nominal geometry and its allowable variation. Application cases using the concept of Rule 2 in the Geometric Dimensioning and Tolerancing (GD&T) are presented. The rule affects all fourteen geometric characteristics. Depending...

radius and thcn approximately express the lines in broken lines [8]. In this paper we present algorithms by using In this paper we choose the run length code as a statistic/geometric features and simulating human primary expression of line drawings for it may contain vision mechanism to extract lines and arcs for all information and is easy to extract skeletons of lines. vcctoriration of engine...

Domain knowledge permeates all aspects of the engineering drawing analysis process, including understanding the physical processes operating on the medium (i.e., paper), the image analysis techniques, and the interpretation semantics of the structural layout and contents of the drawing. Additionally, an understanding of the broader reverse engineering context, within which the drawing analysis ...

The purpose of this research is to identify the disciplines’ participation which are related to the drawing teaching in 74 engineering undergraduate courses in the Santa Catarina State, and to figure out what are the disciplines’ focus in their 19 modalities. We have opted for an analysis in the curricular grid’s use for these courses in order to spot which disciplines work with contents relate...

Spatial thinking is essential for scientific thought; it is used to represent and manipulate information in learning and problem solving (Clements & Battista, 1992). It is also required in many intellectual endeavors such as solving problems in engineering, design, physics and mathematics (Smith, 1964; Pellegrino, Alderton & Shute, 1984). Enhancing students' spatial abilities is one of the role...

Abstract   Fiber-metal laminates (FMLs) are new type of composite materials which could improve defects of traditional composites in ductility, formability, impact and damage tolerance. Drawing behavior of a thermoplastic based FML was investigated consisting of glass-fiber reinforced polypropylene composite laminate and aluminum AA1200-O as the core and skin layers, respectively. The effects o...