| 摘要: |
| 基于流线的可视化方法是重要向量场可视化方法.以往的流线放置算法中很少考虑向量场的物理性质.提出了一种适用于2D和3D向量场的流线放置算法.为了度量向量场根据不同空间位置而变化的性质,引入了向量场的出入流差异属性,计算出入流差异矩阵用于描述向量场的全局属性.选取出入流差异矩阵中的最大值作为流线的种子点.由于出入流差异度和散度定义上有相似性,因而也具有一定的物理性质,能够反映出向量场的内在属性.该方法适用于2D和3D向量场,可以使用少量的流线很好地揭示出流场中的重要信息. |
| 关键词: 向量场可视化 流线放置 出入流差异 |
| DOI： |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973)(2010CB328002); 国家高技术研究发展计划(863)(2011AA120301); 北京林业大学新进教师科研启动基金(BLX2011019) |
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| Streamline Placement Strategy |
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WANG Shao-Rong1, WU Di2,3, WANG Guo-Ping2,3
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1.School of Information Science and Technology, Beijing Forestry University, Beijing 100083, China;2.Graphics and Interactive Technology Laboratory, Peking University, Beijing 100871, China;3.Key Laboratory of Machine Perception (Peking University), Ministry of Education, Beijing 100871, China
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| Abstract: |
| The Streamline based method is one of the most important vector field visualization methods. The physical-related feature was seldom considered in the past streamline placements algorithms. A streamline placement algorithm for 2D and 3D vector field is introduced in this paper. The study measures the difference between the inflow and the outflow to evaluate the local spatial-varying feature at a specified field point. A Difference of Inflow and Outflow Matrix (DIOM) is then calculated to describe the global appearance of the field. The study draws streamlines by choosing the local extreme points in DIOM as seeds. DIOM is somewhat like flow divergence and is physics-related and thus reflects the intrinsic characteristics of the vector field. The strategy performs well in revealing features of the vector field, even with relatively few streamlines in both 2D and 3D vector field. |
| Key words: vector field visualization streamline placement difference of inflow and outflow |
