摘要
本文在射影变换的基础上，运用初等方法导出对偶变换，并给出射影变换的分类．
On the basis of projective transformation a dualistic transformation is ob-tained by primary method, and the classification of projetive transformation is given in thispaper.
关键词
射影变换
对偶变换
分类
射影几何
projective transformation dualistic transformation classification
