projective point

These descriptors are invariant under translation, rotation, and scale, but variant under affine and projective transformation. Five-point invariant descriptor is a contour presentation method and consists of a series of five-point invariants.

这些描述子在相似变换下，能够保持平移、旋转、尺度不变，但在仿射投影变换情况下则不再保持不变性。五点不变量描述子也是一种描述轮廓的方法。

Give the definition by purely synthesis projection of harmonically conjugate point ( line) pair, and prove equivalence of projective definition with algebra definition.

给出调和共轭点（线）偶纯综合射影定义，并证明射影定义与代数定义的等价性。

study of calculation model of projective point for terminal correction submunition

末段修正子弹药弹下点数学模型研究

The congruent point range and line pencils between two projective planes

两射影平面场的合同点列与线束