Using web grammar to recognize dimensions in engineering drawings

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摘要

A web grammar based on arrowhead-match is described in detail and used to recognize dimensions in machine engineering drawings. According to the national standard GB4458-84 of People's Republic of China, the dimensions are classified into 27 patterns and 48 subpatterns whose mathematical descriptions are given. The concept of arrowhead-match is presented and 9 arrowhead-match patterns are summarized. Based on this web grammar, an algorithm for recognizing dimensions is implemented in C on a HP workstation, which can recognize 27 dimension patterns and 48 dimension subpatterns mentioned above.

论文关键词:Dimension,Web grammar,Recognition,Pattern,Arrowhead-match

论文评审过程:Received 9 December 1992, Revised 16 December 1992, Accepted 16 December 1992, Available online 19 May 2003.

论文官网地址:https://doi.org/10.1016/0031-3203(93)90146-N