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Position: Home > Articles > Skeleton Extracting Algorithm for Soil Pore Based on Thinning Method Transactions of the Chinese Society for Agricultural Machinery 2019 (9) 229-234

基于细化法的土壤孔隙骨架提取算法研究

作  者：
韩巧玲;赵玥;赵燕东;潘贤君;彭涌;郑一力
单  位：
北京林业大学工学院
关键词：
土壤孔隙;骨架模型;细化法;距离变换法
摘  要：
为可视化土壤孔隙的空间分布和拓扑结构,进一步理解土壤功能和生态过程,以自定义的规则结构和土壤孔隙结构为应用对象,进行了土壤孔隙骨架提取算法的研究,并验证细化法和距离变换法2种算法构建骨架模型的性能。试验结果表明,2种算法的骨架模型构建效果均不受模型类型的影响,其中,距离变换法构建的骨架模型存在体素点缺失和偏移的现象,而细化法提取的孔隙骨架模型结构完整,其平均骨架偏移距离(0. 10 mm)比距离变换法(0. 15 mm)减少了50%,具有良好的拓扑不变性。通过对细化性、连通性和中心性3个指标的综合分析,细化法具有优越的描述土壤孔隙形状及拓扑特征的能力,可为土壤物理结构及水文特性的研究奠定技术基础,为从孔隙尺度理解土壤功能奠定理论基础。
译  名：
Skeleton Extracting Algorithm for Soil Pore Based on Thinning Method
作  者：
HAN Qiaoling;ZHAO Yue;ZHAO YANDong;PAN Xianjun;PENG Yong;ZHENG Yili;School of Technology,Beijing Forestry University;Beijing Laboratory of Urban and Rural Ecological Environment,Beijing Municipal Education Commission;Key Laboratory of State Forestry Administration for Forestry Equipment and Automation;
关键词：
soil pore;;skeleton model;;thinning method;;distance transformation method
摘  要：
The visualization of the spatial distribution and topological structure of soil pores plays an important role in understanding soil ecological processes. Thus the research on the soil pore skeleton extraction algorithm was carried out. Based on the custom rule structure and the soil pore structure,the performance of the thinning method and distance transformation method to construct the pore skeleton model were evaluated. The experimental results showed that the skeletal model construction effects of the two algorithms were not affected by the model type. Among them,the skeleton model constructed by the distance transformation method missed voxel points and some voxel points tended to be off the center.While the pore skeleton model extracted by the thinning method had perfect centrality,connectivity and topological invariance,whose average skeleton offset distance( 0. 10 mm) was 50% lower than that of the distance transform method( 0. 15 mm). Through the comprehensive analysis of three indicators of refinement,connectivity and centrality,the thinning method had superior ability to describe the shape and topological characteristics of soil pores. The research laid a technical foundation for the study of soil physical structure and hydrological characteristics,and a theoretical foundation for understanding soil function from pore scale.

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