Interactive recognition of hand-drawn circuit diagrams

Dreijer, Janto F. (2006-12)

Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2006.


When designing electronic circuits, engineers frequently make hand-drawn sketches of circuits. These are then captured with a computerised design. This study aims to create an alternative to the common schematic capture process through the use of an interactive pen-based interface to the capturing software. Sketches are interpreted through a process of vectorising the user’s strokes into primitive shapes, extracting information on intersections between primitives and using a naive Bayesian classifier to identify symbol components. Various alternative approaches were also considered. It is concluded that it is feasible to use a pen-based interface and underlying recognition engine to capture circuit diagrams. It is hoped that this would provide an attractive early design environment for the engineer and enhance productivity.

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