Preprocessing of Digitalized Engineering Drawings

Scrambling of engineering drawings

Engineering drawings are ubiquitously used for capturing, conveying and archiving innovative engineering designs. Many engineering companies’ core intellectual property resides in their proprietary engineering drawings. Therefore, protection of such vital data is extremely important. This paper provides a swap-transformation matrix based approach to scramble engineering drawings in order to ena...

Interpreting Annotated Engineering Drawings

Arc Segmentation in Engineering Drawings

This paper describes a method for the recognition of outlines in engineering drawing in terms of line and arc primitives. The approach is based on vectorizing a binary image, smoothing the vectors so a sequence of small straight lines, and then attempting to fit arcs. Two further levels of constraints are then applied. One ensure smoothness where appropriate, which results in vectors that are p...

Understanding Engineering Drawings: A Survey

Mechanical design and manufacturing information for 3-D solid objects has been eeectively conveyed through a set of annotated orthographic projections and optional cross-sections. This forms the basis of engineering drawings, which solve the problem of unambiguously representing a 3-D object on a 2-D plane. In this paper we address the inverse problem: given an engineering drawing of an object,...

Grammar-Driven Interpretation of Engineering Drawings

We describe a methodology and associated system for the interpretation of images of engineering drawings based on the exploitation of the Unix tool Yacc. The system is extensible and clearly relates a hypothesis/prediction/verification strategy to a hierarchical model description and the deployment of low level techniques. Examples are given of the interpretation of real mechanical engineering ...