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中文摘要：
针对基于内容三维模型检索中形状特征提取的关键问题,提出一种基于空间对称变换的三维模型形状特征描述符构造方法,此方法主要依据三维模型内部无处不在的对称特性.首先计算三维模型中点对之间的对称变换,其中点对来源于球面均匀分区采样后顶点集;然后利用点对的对称变换构造三维模型顶点对称空间,并结合空间聚类获得三维模型内部对称关系,从而给出对称区域描述;最后将对称区域描述符集合中数据按照对称区域大小排序后作为整个三维模型形状特征描述符,此特征受三维模型简化、细化、以及几何操作影响较小,且利用特征库后三维模型检索速度比较满意.文章最后分别从特征相似性比较、检索效率以及检索实验结果三个方面验证了方法的有效性.
英文摘要：
Extracting shape feature is the key point of content-based 3d model retrieval.For this problem,a new approach is proposed for constructing 3d shape descriptor using spatial symmetry transformation.The main idea of this method is that symmetry is an important cue for all objects.At first,symmetry transformation of pair point is calculated,and the points come from spherical uniform sampled. Then symmetry space is built by pair symmetry relation.And using space clustering gets region symmetry description of 3d model.At last,range region symmetry descriptors in descend order to form shape descriptor of whole 3d model.This descriptor is robust to 3d model simplification,subdivision and other geometry operation.Retrieval response time is also satisfied.The effectiveness of the proposed approach is verified by three different sides that are feature similarity comparing,retrieval efficiency and results demonstration.
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