基于直线段集合图像给定区域内直线线段的结构文法及其所含几何基元数目和几何基元种类将人造目标从自然背景中提取出来。

Structure grammar based on local area of collection of line segmentation and geometric element and number of classes of geometric element could extract manmade object from natural background.

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通过分析贴合面边界的有效性，研究形体表面某些特殊线段的处理，阐迷了集合体的构形过程及画图的原则。

The treatment of some special line segments on body surface is studied by analyzing the validity of joint surface boundary. The forming process and drawing principle of aggregate are stated.

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