工程图矢量化中的尺寸识别与重建

Dimension Recognition and Reconstruction in Vectorization of Engineering Drawings

尺寸识别是工程图识别的重要环节 针对现有单入口识别算法的局限性 ,提出了一种多入口的尺寸识别算法 ,从多种已识别的图形元素开始搜索一个尺寸标识 在遇到不能正常识别的图形元素时 ,通过先搜索其他组成元素获得尺寸标识的初步确认后 ,放宽阈值对未识别元素进行再识别 ,有效地识别受退化或干扰影响较大的尺寸元素 提出了基于坐标网格的图形元素尺寸重建方法 ,通过建立坐标网使每一尺寸在整体环境下得到调整 。

Dimension recognition is an important aspect of automatic engineering drawing understanding In this paper, a multi entry dimension recognition algorithm is presented It starts searching for dimensions from elements of various types already recognized When an element cannot be recognized under normal conditions, other elements are tried to obtain a primary confirmation about the dimension structure Then the threshold is relaxed and used to recognize the element again Therefore, dimensions with much degradation and disturbance can be detected effectively Also presented is a geometry reconstruction method based on the coordinate grid Every dimension and associated entities are adjusted under the overall guidance of the coordinate grid, which satisfies the requirement of data precision for drawing reuse