地形图扫描图象中地形线快速矢量化方法研究

针对地形图扫描图像中地形线黑像素点阵稀疏、跳跃性强、线条平滑任意多变的特点,对矢量化方法中去除噪音、动态跟踪算法、动态修正节点等关键技术进行了研究,并开发了相应的软件.通过对跟踪方向的智能选择和跟踪步长的人机对话设置,优化了对地形线图元的搜索.采用线宽拟合、智能修正的方法尽量保留了原图信息,真实地反映了图纸原貌.软件测试结果表明本文方法对地形线能进行快速有效识别.

Research on Rapid Vectorization of Contour Line in Topomap Scanning

Absence of black pixels array, variety in arrange and linellate smooth are the characteristics of topomap scanned image. The key techniques of vectorization, such as noise removement, dynamic tracking method and dynamic modified nodes are studied in the paper, and the software is obtained with precise and sufficient vectorization results. During the process of vectorization, the tracking length can be set dynamically and the regional received current pixels are reserved and used to supervise the first tracking region of next key pixels. Furthermore, the method of line-width fitting and the intelligent amendment are used to preserve true features of the image. The practice demonstrates that the method is proper for topomap scanning image vectorization.