The first step of the method (preprocessing) takes into account the invariant properties of the normalized moment of inertia and a novel coding that extracts topological object characteristics.

• 该方法分两步:第一步,预处理阶段,通过归一化转动惯量和采用一种新的编码方法来抽取对象的不变拓扑特征,并存入一个数据库中。