機械製図図面の認識(第1報) : 線図形要素分離のためのボトムアップ処理

概要

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This paper presents a method of bottom up processing for separating thick lines and hair lines and for recognizing straight lines, circles and arcs. It plays a fundamental and important role in the whole recognition method for mechanical drawings written on the basis of JIS drawing rules. This is the first report preceding other issues such as generating a recognition model, top down verify/modify processing and dimension matching for generation of a 2-D CAD model. First, all original binary image data are classified into two classes, thick and hair lines, with use of line width. Then, they are transformed into skeletons in both classes and after that each skeleton is divided into several segments. Further, based on the geometrical feature of the segments, those of thick lines are classified into straight lines, circles, arcs, etc., and they are transformed into structural representations. Some examples are finally shown.
公益社団法人精密工学会の論文
1990-11-05