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在分析工程图尺寸标注特点的基础上提出一种基于标注字符理解的尺寸标注识别方法，并以机械图为例在ＡｕｔｏＣＡＤ环境下实现了一个尺寸标注识别系统，该系统通过对标注字符的理解和图形结构的分析，可以在矢量化的机械图纸中识别出尺寸标注。
Based on the analysis of the characteristics of drawing dimension, this paper proposes a method of dimension identification based on the character recognition of marked characters. A mechanical dimension drawing is used to realize a dimension identification system in AutoCAD environment. Analysis of the graphic structure allows the dimensioning to be identified in vectorized mechanical drawings.