基于法线夹角与面积分布的三维CAD模型检索

三维CAD检索技术对产品设计、重用具有促进作用.经典的三维模型检索算法——形状分布算法SD,适用于全局特征相似的模型检索,但对于全局相似但局部差异明显的模型则无法有效检索.针对这一问题,本文首先提取SD特征,并利用基于法线夹角与面积分布的特征提取技术来对模型局部特征进行描述,随后通过构造特征矩阵来融合提取到的法线夹角与面积分布两类特征,最后将SD特征与法线夹角与面积分布特征进行组合,形成新的特征并应用于检索.实验结果验证了该方法的有效性.

3D CAD model retrieval based on the normals angle and area distribution feature

3D CAD retrieval technology has great potential for product design. Shape distribution algorithm for 3D model retrieval techniques focus on the global feature more than local detailed features which are not applicable for 3D CAD models retrieval. This paper proposes a new method to solve this problem. First, SD feature is calculated. Secondly, an automatic feature extraction method based on normals angle and area distribution is used. Thirdly, the extracted features are fused into a matrix. Finally, 3D CAD model retrieval is implemented by combining the SD feature and normals angle and area distribution feature. Experiment results show that the proposed algorithm improves the precision of 3D CAD retrieval