从点云数据中直接识别实体特征的方法研究  

Method research of direct solid feature recognition from point cloud data

作　　者：栗全庆[1] 刘红霞[1] 

机构地区：[1]郑州航空工业管理学院管理工程学院,河南郑州450046

出　　处：《机械设计》2016年第4期89-94,共6页Journal of Machine Design

摘　　要：阐述从点云数据中基于体特征来对数据分组、实体造型、实体拼合的CAD实体模型构造的思路,提出造型特征的定义,指出对任意实体特征而言,不论断层的方向如何,其相邻断层的图形是不变或逐渐变化的,不可能突变(产生突变的断层一定是两个特征的连接处)。在依据轮廓点图来识别特征时,首先是判定相邻轮廓点图的"相似程度",然后才是判断轮廓的具体形状"是什么"。在相邻轮廓点图配准时,没有必要进行逐点比较,而是比较它们在形状、位置和大小方面是否一致。为此提出了断层轮廓点图的数学表示,以粗略描述轮廓的位置、形状和大小,然后给出了特征识别法则。该方法具有简单、自动和实用的特点。It has elaborated the thought that CAD solid model was constructed from point cloud data based on the data group, solid construction and solid piece together. The definition of modeling feature was presented to point out that the neighboring slicing layer shape was unchanged（the changed layer must be the connector between two features） or changed gradually for any solid features, no matter how the direction of slicing layer was. ＂The level of similarity＂ of the neighboring contour point images should be judged first, and then the ＂what is it＂ of the specific shape should be judged second when recognizing the contour point features. It was not necessary to do the comparison point by point when matching neighboring contour point images. It only need compare the consistency of the neighboring contour in shape, position and size. Therefore, the mathematical expression of point images of slicing contour was proposed in order to describe the shape, position and size of contour roughly,and then the recognition theorem was given. This method has the features of simple, automatic and practical.

关 键 词：反求工程 特征 特征识别 造型 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术] TH122[自动化与计算机技术—计算机科学与技术]