文中关于连通群的理论分析为解决工程图中字符、数字和图形的正确分割、分类及排除噪声的干扰提供了依据，连通群的迭代算法可准确定位字符串的方向。
The classical basis of the linked group are given which is used to recognize the engineering drawing papers, and the direction determination algorithm for the character string is also described.
首先进行第一次连通体检测，选择用于字符群上下边缘线拟合的连通体。
Connected components are detected the first time to be chosen for fitting upper and lower edge lines.
本文假设G为一有限群且G的模特征标度图有两个连通分支。
In this paper, we assume G is a finite group and its modular character degree graph has two connected components.
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