機械製図図面の認識(第2報) : 幾何学的及び位相的特徴に基づく線要素の分離

概要

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This paper presents a method of bottom up processing for separating all drawing elements in a whole recognition system for mechanical drawings. This is the second report succeeding the first one which mainly dealt with a method of separating thick- and hair-lines using line width and the structural representations of thick-lines. However, this methed can be applicable only to the drawings which keep the JIS drawing rules vigorously, especially about line width. In this paper, we propose another approach which can be applicable to wider range of mechanical drawings. The method mainly utilizes geometrical and topological features and uses line width additionally. The whole algorithm is shown to separate all line elements, i. e., dimension lines, projection lines (temporarily separated), center lines, hidden outlines, leader lines, visible outlines, projection lines (finally separated) and characters, in this order. Some experimental results applied to sample drawings in a book of mechanical drawings are finally shown.
公益社団法人精密工学会の論文
1992-01-05