基于趋势优先跟踪方向的直线矢量化算法

直线是工程图纸中最常使用的图元，并且工程图中常出现的圆、圆弧、曲线都可以用直线段来生成，因此，对直线的矢量化是工程图识别中一个非常重要的研究方向。针对工程图的特点，提出了一种基于趋势优先跟踪方向的直线矢量化算法，在细化后的单像素宽度图形上，根据直线的斜率趋势确定优先跟踪方向，较好地解决了在交叉点处长直线断裂的问题。同时结合跟踪过程中使用的边跟踪边检测方法，可以有效抑制短小直线段过多地产生，实现小斜率直线和大斜率直线的整体识别。

Line vectorize algorithm based on trend preferential tracking direction

Straight-line segments are the most frequently used constituent in most engineering drawings.Many other constituent,such as circles,arcs,and curves is generated through straight line segments approximation,so the vectorization of straight lines is one of the most important research directions in the field of recognition of engineering drawings.Considering the characteristics of engineering drawings,a trend preferential tracking direction based on line vectorize algorithm is proposed.In the thinned drawings,the preferential tracking direction is determined by the slope of line,which solved the problem of long-line's disconnection at intersections.Combined with the method of correcting while tracking in tracking process,the overabundance of short-line segments is avoided and the small-slope-line and big-slope-line are also well recognized.