基于自适应蒙皮变形的点云姿态迁移  

Point-Cloud Self-Adaptive Pose Transfer Based on Skinning Deformation

作　　者：李明 尹梦晓[1,2] 李桂清 赵美[1] 杨锋 Li Ming;Yin Mengxiao;Li Guiqing;Zhao Mei;Yang Feng(School of Computer Electronics and Information,Guangxi University,Nanning 530004;Guangxi Key Laboratory of Multimedia Communications Network Technology,Nanning 530004;School of Computer Science and Engineering,South China University of Technology,Guangzhou 510006)

机构地区：[1]广西大学计算机与电子信息学院,南宁530004 [2]广西多媒体通信与网络技术重点实验室,南宁530004 [3]华南理工大学计算机科学与工程学院,广州510006

出　　处：《计算机辅助设计与图形学学报》2022年第11期1673-1683,共11页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(61762007,61972160,61862004)。

摘　　要：为避免全局平滑系数的DDM在点云姿态迁移时出现撕裂、扭曲以及姿态学习不充分等问题,提出一种自适应权重蒙皮变形点云姿态迁移方法.首先利用改进的拉普拉斯收缩骨架提取方法提取源点云模型和参考点云模型的同构骨架,用聚类优化关节点位置,并计算2个同构骨架之间的关节点的几何变换;然后根据顶点变形程度和聚类划分改进DDM的逐点平滑系数,利用骨架层次信息对源姿态进行刚性蒙皮权重绑定;最后将蒙皮问题重新表达成求解刚性变换矩阵,实现姿态迁移.在现有MPI DYNA的人体点云模型和MIT的动物点云模型上进行骨架提取与蒙皮变形实验,实验结果表明,所提方法可生成无冗余分支和关节点的同构骨架,得到细节保持良好、姿态学习较充分的目标姿态模型.A point cloud pose transfer method based on self-adaptive weights skinning deformation is proposed to avoid the problems such as model tearing,distortion and insufficient pose transfer caused by the global smoothing coefficients of DDM.Firstly,the isomorphic skeletons of the source point cloud and the reference point cloud are extracted through the improved Laplacian contraction skeleton extraction method,the locations of the joints are optimized via clustering,and the geometric transformations of the joints between two isomorphic skeletons are calculated according to the isomorphic skeletons.Then,the per-vertex smoothing weights of DDM are improved based on the deformation degree of the vertex and clustering partition,and the rigid skinning weights of the vertices of source model are determined by using the skeleton hierarchy information.Finally,pose transfer is achieved via reformulating skinning as solving the rigid transformation matrix.Skeleton extraction and skinning deformation are carried out on the existing human point cloud models from MPI DYNA and animal point cloud models from MIT.The isomorphic skeletons generated by the proposed method are without redundant branches and joints.The experiment results show that the reference pose is studied sufficiently and the details of the source are kept well.

关 键 词：姿态迁移 蒙皮变形 点云处理 骨架提取 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]