摘要
为了提取彩色地形图上的等高线,首先把RGB颜色空间转换为HSV颜色空间,对彩色地形图进行分色,以获得棕色等高线的二值图像;然后利用数学形态学的方法对二值等高线图像滤波,消除等高线线体内的孔洞.利用梯度矢量流主动轮廓模型在等高线二值图像上直接提取未经细化的等高线,并结合等高线断裂区域的等高线流向场连接断裂的等高线.最后验证了文中算法的有效性.
To extract contour lines in topographic map, color topographic map is firstly segmented for achieving the binary image of brown color contour lines in this paper. Secondly, mathematic morphology method is Used to filter the binary image to remove holes in contour lines. Next, contour lines are recognized before skeletoning them utilizing deformable active contour model. Last, we have analyzed the directional field of contour lines in gap, and then reconnected broken contour lines. The performance of the algorithm is tested on several topographic maps and compared with other algorithms.
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2006年第7期982-987,共6页
Journal of Computer-Aided Design & Computer Graphics
基金
总装备部"十五"重点项目基金(104050202)
江苏省自然科学基金(BK2004137)
关键词
地形图
等高线提取
主动轮廓模型
梯度矢量流
等高线流向
topographic maps
extraction of contour lines
active contour model
gradient vector field
directional field of contour line
