非结构矢量场的特征区域可视化方法  

Visualization of characteristic region in unstructured vector field

作　　者：隋雷[1] 何兵[1] 

机构地区：[1]北京航空航天大学计算机学院虚拟现实技术与系统国家重点实验室,北京100083

出　　处：《计算机工程与设计》2009年第24期5726-5728,5732,共4页Computer Engineering and Design

基　　金：国家863高技术研究发展计划基金项目(2007AA01Z337)

摘　　要：基于特征比对的可视化方法涉及的问题主要包括,如何判断一个矢量场中是否存在另一个矢量场中的一些特定结构,如何评价两个矢量场结构间存在的相似性,如何从诸多矢量场中将这些特定的结构检测、定位并绘制出来。给出了一种基于曲线结构的矢量场特征区域可视化方法,该方法通过构造与曲线结构相关联的柱坐标系,保证了提取特征的平移、旋转和尺度不变性;采用曲线积分的Clifford Fourier变换,获取了曲线结构的频域特征并简化计算;利用多曲线结构匹配和多尺度逼近等方法,实现了区域结构的特征可视化。How to determine if some special structures in a vector field are in some other vector fields,how to evaluate the similarity between two vector fields,how to detect,locate and render these special structures in several vector fields.Involved in these issues is visualization method based on feature contrasting.An approach for the visualization of characteristic region in unstructured vector field based on curve structure is presented,by constructing a cylindrical coordinate relevant to the curve structure,the translation,rotation and scale invariability of the features are guaranteed;Clifford Fourier transform is used to get the frequency domain features and the cal-culation is simplified;using matching algorithm of curve structures and multiscale approximation,the visualization of characteristic region is implemented in unstructured vector field.

关 键 词：特征提取 可视化 非结构矢量场 Clifford傅立叶变换 特征比对 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]