中文摘要：

基于自旋坐标和自旋图理论,给出基于平均自旋图的三维形状特征描述方法,用于三维模型检索。给出三维模型顶点自旋图坐标的定义,对于三维模型上任意顶点,给出能够描述其形状特征的自旋图,在对模型顶点密度归一化后得到三维模型的平均自旋图。该方法对三维模型分辨率、法向和位置扰动、空间姿态等影响因素具有较高的健壮性,且具有较好的查准率和查全率,能够有效用于三维形状检索。

英文摘要：

A 3Dshape feature descriptor based on average spin image was presented,and it was used in 3Dmodel retrieval.The spin coordinate was given,and for every vertex of 3D model,the spin image was given to descript its shape feature.After the density of vertex was normalized,the average spin image was defined on 3D model.Experimental results show that,this algorithm is robust to the resolution,and the noise on normal and vertex position,even to the pose of models.Better ratio of recall and precision show that,the algorithm can be used for 3Dshape retrieval.