保持各帧拓扑关系一致的三维时序网格简化

将经典的静态三维网格简化方法QEM引人到三维时序网格的简化过程中，通过计算每一条边在所有帧中的最小合并代价之和来选择误差最小的简化边，然后各帧同时对该边实施合并操作，从而保持各帧拓扑关系在简化后的一致性，为了保留更多重要运动特征处的细节信息，提出根据每一条边在各连续帧间的长度和折叠角的变化程度为其合并代价分配一定的权重系数，从而延迟变形较大的边的合并，使得简化后的时序网格模型具有更好的视觉效果，实验结果表明，文中方法不仅能够在简化后保持各帧拓扑关系一致，还能较好地延迟重要运动特征的简化。

Simplification of 3D Time-Dependent Mesh Sequences with Topological Coherence Preserved among Frames

We present a simplification method of 3D mesh sequences, which is an improvement of the traditional mesh simplification method QEM in terms of topological coherence preserving. Firstly, the sum of the least costs of every edge in different frames is computed and regarded as the choosing standard of contracting edges. Then the same edge in minimum-cost in all the frames in a frame sequence is contracted at the same time, which ensures the same topological simplification of these frames. In order to keep more details in important motion features, a weight factor is allotted to the contraction cost of each edge according to the distorted degree of edge length and crease angle among frames. The experimental results show that our method can not only preserve the topological coherence among all frames after simplification, but also delay the simplification of important motion features.