Recognition of characteristic symbols in engineering drawings

Chan Pyng Lai; Rangachar Kasturi

doi:10.1117/12.130276

1 August 1992 Recognition of characteristic symbols in engineering drawings

Chan Pyng Lai, Rangachar Kasturi

Proceedings Volume 1661, Machine Vision Applications in Character Recognition and Industrial Inspection; (1992) https://doi.org/10.1117/12.130276
Event: SPIE/IS&T 1992 Symposium on Electronic Imaging: Science and Technology, 1992, San Jose, CA, United States

Abstract

An algorithm to recognize characteristic symbols in engineering drawings is presented. Characteristic symbols help in the classification of dimensioning text into one of the following four classes: linear, angular, diametric, and radial. Recognition of characteristic symbols is an important tool for the extraction of dimension-sets in a machine drawing understanding system. Text in drawings is used to provide dimensioning and tolerance information, and to describe part details such as material, finish, etc. A text/graphics separation algorithm followed by a post-processing step is used to separate potential dimensioning text from graphics. The characteristic symbol in each dimensioning text block is recognized by the algorithm described here. This algorithm includes extraction of end points and critical points for each character/symbol in the text block, and a rule-based recognition system based on simple heuristics. Experimental results are presented.

Citation Download Citation

Chan Pyng Lai and Rangachar Kasturi "Recognition of characteristic symbols in engineering drawings", Proc. SPIE 1661, Machine Vision Applications in Character Recognition and Industrial Inspection, (1 August 1992); https://doi.org/10.1117/12.130276

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