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提出了一种新的矢量化工程图形几何特性自述方法——基于角度的编码,它能满足所有方位图形元素的编码要求,对任意几何外形在平移、相似及旋转变换下具有不变性。为了有效地实现图形几何形状信息提取,文章最后根据图形元素几何约束关系提出了图形子模式分解的一般方法,大大提高了图形的识别效率和识别稳定性。
A new self-description method of vector graphic properties of engineering graphics is proposed, which is angle-based coding. It can meet the encoding requirements of all azimuth elements and has invariance to any geometric shape under translation, similarity and rotation transformation. In order to effectively extract the information of geometric shapes, this paper presents a general method of graph sub-pattern decomposition according to the geometric constraints of the graphical elements, which greatly improves the recognition efficiency and recognition stability.