基于节点区域分离的工程图纸整体识别方法

在工程图纸矢量化处理中着眼于图形的宏观特征，提出了一种整体识别方法，该方法中，引入节点区域的概念，通过节点区域与图段的连接关系确定图形的拓扑结构，并由节点区域分离分割图段，图段的跟踪识别以图段轮廓的方向码序列为引导实现。整体识别算法矢量化速度快，有较强的抗噪声能力。

A Global Recognition Approach to Scanned Image of Engineering Drawings Based on Separation of Node Region

By introducing the conceptofnode region, the globalrecognition approach focuseson the integralcharacters ofthe graphics in vectorization processofscanned im age ofengineering draw ing . Itdependson the connection betw een node region and segm entin acquiring the topologicstructureofthegraphics. And node regions can beused to separate the segm ents. The segm entis recognized via tracing the chain code ofits contour. The globalrecognition algorithm has such advantages as high speed, noise resistance.