利用工程图纸的整体形状特性，提出了对扫描图象的直线整体识别算法，该算法对图象线条轮廓上的关键点进行了精确记录，并对它们进行了分析和处理。该算法不必单独处理线的交叉问题，但交叉点处的效果明显。它的基本思想是：首先检测原图象线宽，然后依据原图象线条的不同线宽，把原图象转化为一些由梯形块组成的条块图，并对不同的条块图分别进行整体识别

A new global approach for the recognition of lines in scanned engineering drawings is proposed in this paper.This method can not only obtain the crucial points placed in line contour but also analyze and process these points.It shows good effects on cross areas without dealing with interaction areas after recognition. The algorithm detects widths of lines in scanned engineering drawings first,and then extracts trapezoid black blocks and converts the image of scanned engineering drawings into several trapezoid block adjacent graphs which are composed by the trapezoid black blocks based on the different line widths in drawing image,and then generate and recognizes lines based on the different graphs receptively.The results demonstrates the effectiveness of this method, especially at the interaction points.