projective invariant meaning in English

射影不变式

On the stage of describing the shape of airplane and extracting feature , we derive five - coplanar - point invariant from the basic projective invariant - cross ratio , and resolve the problem of stabilization of five - coplanar - point when there is three points are nearly collinear
在对飞机外型提取特征进行描述的阶段，首先从基本的射影不变量交比不变量出发，推导出了平面五点不量，并解决了当有三点接近共线时不变量不稳定的问题。