There are two problems in 2D shape blending: vertex correspondence and vertex interpolation.
二维物体变形的研究包含两个问题：顶点对应问题和顶点插值路径问题。
参考来源 - 二维物体若干变形技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
According to the lines of centroid and vertex, and angles between the two adjacent lines, a function is given and then a correspondence is established between the two polygons.
根据两多边形的形心—顶点连线长度及相邻连线之间的夹角给出匹配度函数，并以此来建立两多边形顶点之间的对应。
Two graphs are isomorphic if there is a correspondence between their vertex sets that preserves adjacency.
如果在两个图之间存在一个保持邻接性的1 - 1对应，则这两个图是同构的。
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