彩色扫描地图中线目标的矢量化方法.pdfVIP

第 21 卷第 4 期 2009 年 4 月 计算机辅助设计与图形学学报 Vol. 21 , No.4 Apr. , 2009 JOURNAL OF COMPUTER-八IDED DESIGN . COMPUTER GRAPHICS 彩色扫描地图中钱目标的矢噩化方法 杨云1)朱长 孙群 !)(l!í安测绘研究所地刚学 1草地观俏息丁.税研究3在 商安 710054) Z)( 南京师范大学靡拟地理环蝙教育部重点实验室 南京 210046) 3(信息1:程大学测绘学院郑州 450052) (yytoall@ 126. com) 摘 要 地附要翁的矢量化是从扫描地阁中获取地理倍息的重要问题之一.通过分析彩色扫描地图的颜色特征，提 出了m嗣种线目标学自动矢键化的方法‘诙方法通过在用户选择的线目标上加一个滑动窗，采用颜色空间转换、K幡均 值聚类和区域生长相综合的方法对窗口内的吗前线目标进行自适应分割;再通过不断地沿前进方向移动窗口和对 窗口内的线目标进行分割、细化及序赏跟踪.来完成线目标的矢量化.实验结果表明，文中方法快速、准确、适应性 强，对于低对比皮、低筒噪比的彩色扫描地图尤为有效. 关键诩 彩色地图;矢量化;滑动窗口;图像分割 g线跟踪 中阁法分类号 丁的91 Vectorization of Linear Features on Color Scanned Topographic Maps Yang Yun l1 Zhu Changqing 21 Sun Qun 3 ) 口 (Departmerzt of ;artography and GIS E:ηgíneering. Xí an Research Institute of Surveying and 晶1apping. Xjan 710054) Z (Key Laboratory of Virtual Geographic Environment of Ministry of Education. Nanjing NO rmal University. Nanjing 210046) 3) (Institute of Surveying and Ma户ping. lnformation Engíneering Uníversíty. Zhengzhou 450052) Abslract Cartographic feature vectorization is one of the most salient problems in the acqu?s?tion of geographic information from scanned topographic maps. 丁his paper presents a novel sem卜 automatic approach to linear feature vectorization based on the analysis of color scanned topographic map features. By the approach. a sliding window is added on a user- given l?near feature. and the current linear feature ?n the window is segmented se!f -adaptively by using color space conversion , K -means clustering and region growing. The linear feature is vectorized through moving the window continuously along the forward direct?on , image segment , thinning and sequential tracking. Experimental results show that linear features can be vectorízed rapidly and accurately by using the proposed approach. and good robustness can be obtained , especially for color scanned topographic maps with lower contrast and lower SNR. Key words color topographic map; vectorízation; sliding wíndow; image segment;