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Development of Visual Data Mining Tool for Vector Fields

矢量场可视化数据挖掘工具的开发

基本信息

批准号：
13680401
负责人：
FUJISHIRO Issei
金额：
$ 2.62万
依托单位：
Ochanomizu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

In this research, a texture-based vector visualization method, called LIC (Line Integral Convolution), has been extended to three-dimensional fields. A sophisticated vector volume visualization code has been developed, which can adaptively visualize inner structures of interest around critical points within generated 3D LIC textures by topologically-accentuated spatial transfer functions and a 3D streamline illumination model.The core algorithm consists of the following four steps :1) Generate a 3D volume for solid LIC texture from a given vector field by using a method developed by Mao, et al (1997).2) Locate critical points of the field with differential topology methods.3) Accentuate spatial transfer functions in a topological manner so that they can reflect the significance distribution analyzed in Step 2.4) Volume render the LIC volume generated in Step 1 with the spatial transfer functions and a 3D streamline illumination model.The above method has been implemented on a GPU-enhanced volume graphics PC and cluster systems for providing a real-time volume data mining environment. The effectiveness of the tool has been proved empirically with an application to several practical datasets, including a simulated tornado dataset provided by R. Crawfis of Ohio State University, US, and geo-scientific datasets generated by using GeoFEM, known as a parallel FEM middleware for the Earth Simulator.

在本研究中，一种基于纹理的矢量可视化方法，称为LIC（线积分卷积），已经扩展到三维领域。开发了一种复杂的矢量体可视化代码，该代码可以通过拓扑强化空间传递函数和三维流线照明模型自适应地可视化生成的三维LIC纹理中关键点周围的内部结构。核心算法包括以下四个步骤：1)使用Mao等人（1997）开发的方法，从给定的矢量场生成实体LIC纹理的三维体。2)用微分拓扑方法定位场的关键点。3)以拓扑方式强调空间传递函数，使其能够反映步骤2.4中分析的显著性分布。（体积）用空间传递函数和三维流线照明模型渲染步骤1中生成的LIC体。上述方法已在gpu增强型卷图形PC和集群系统上实现，以提供实时卷数据挖掘环境。该工具的有效性已经通过几个实际数据集的应用得到了经验证明，包括美国俄亥俄州立大学R. Crawfis提供的模拟龙卷风数据集，以及使用GeoFEM生成的地球科学数据集，GeoFEM被称为地球模拟器的并行FEM中间件。