一种新的截面轮廓特征点识别与分段曲线类型判别算法  

A New Algorithm for Feature Point Recognition and Curve Type Determination of Sectional Profile

作　　者：顾步云[1] 周来水[1] 李涛[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《机械科学与技术》2007年第11期1398-1402,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：航空科学基金项目(03H52059);高等学校优秀青年教师教学科研奖励计划项目;江苏省创新人才培养基金项目(BK2001408)资助

摘　　要：截面特征处理技术是基于特征的反求工程CAD建模中的一个重要组成部分,而特征点识别、分段曲线类型判别是其首要环节。本文提出一种新的算法:首先对截面数据点排序;然后基于协方差矩阵的特征值分析自适应地确定支撑区域;在此基础上计算离散点的曲率进而完成特征点识别并实现数据分段;最后确定每个分段数据所对应的曲线类型。实验表明:算法精度较高,为基于特征的截面曲线重建提供了依据。The processing technology concerned with sectional feature is an important part of the reverse modeling based on feature. Especially, the feature point recognition and curve type determination of segmented data points are the primary part in the process of reverse modeling based on seetional feature. Therefore, a new algorithm for feature point recognition and curve type determination is proposed. Firstly, the seetional data points are ordered, and the region of support of eaeh point is defined adaptively based on the eigenvalue analysis of its covarianee matriees. Then, the diserete eurvature is eomputed, whieh ean be used to reeognize the feature points and to segment data points. Finally, the proper curve type of each segmented points is determined. The experimental results demonstrated that the proposed algorithm is effective, and it is helpful to the following sectional curve reconstruction based on feature.

关 键 词：反求工程 截面特征 特征点识别 分段类型 协方差矩阵 离散曲率 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]