车辆导航地图显示中道路密度的模糊均匀化

Fuzzy homogenization of road densities in vehicle navigation map displays

采用分层路网模型的车辆导航电子地图,在多尺度显示中,会出现同一显示尺度下不同区域道路显示密度不均匀的问题,大量区域显示的道路十分稀疏,影响了导航引导效果。该文提出了道路显示密度的模糊均匀化方法,利用道路显示密度的模糊评价方法建立路网层级、显示尺度和显示区域3种显示要素的最优对应关系,进而实现全地图道路的均匀合理显示。为保证方法适用于计算能力较低的嵌入式导航环境,设计了分离式实现机制。实验结果表明:该方法能够显著提高道路显示的均匀性,实际导航时额外占用的计算资源很少,适用于嵌入式导航设备。

The road densities of different display areas at the same display scale are not homogeneous in multi-scale representations of e- lectronic vehicle navigation maps based on hierarchical road network models. Few roads are displayed in many areas, which negatively af- fects the vehicle navigation. This paper develops a fuzzy homogeniza- tion method for road display densities. The method provides a homo- geneous, reasonable display of the roads by establishing an optimal relationship between the road network level, the display scale and the display area based on a fuzzy evaluation method for road display densities. A separating realization process is designed to apply the method to embedded navigation systems with limited resources. Tests show that the method improves the homogenization of the road display while using little additional computing resources in the vehi- cle navigation system, which indicates that the method is appropriate for embedded navigation devices.