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Transforming schematics to CAD files using a Hough-based recognition scheme

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2 Author(s)
Johnson, R.B. ; Bristol Univ., UK ; Bird, B.M.

An integrated system for converting scanned schematics into computer-aided-design files is presented. An investigation is made into the recognition of all electrical engineering symbols recommended by the IEE. Symbol recognition employs an enhanced Hough transform representation complemented by a feature selection process which takes place under decision tree control. Character recognition is carried out by a dynamic implementation of the Ross template matching scheme. It is recognized that the close similarities of many components and ambiguities in the data, had to be resolved by human interaction. A post-processor error correction plan is therefore proposed to improve the performance of the system. Tracking of the interconnections is carried out to obtain a directed graph representation of the circuit diagram which is subsequently analysed to produce the CAD file

Published in:

Image Processing and its Applications, 1992., International Conference on

Date of Conference:

7-9 Apr 1992

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