【摘要】 利用平面上的射影变换定义二阶曲线上的射影变换,并得到如下几个主要结论:二阶曲线上的射影变换一定是二阶曲线上有限个透视的合成;二阶曲线上的对合一定是透视;平面上的射影变换将二阶曲线上的透视变为二阶曲线上的透视。更多还原

【Abstract】 Use plane projective transformation definite the quadratic curve projective transformation,and obtains the following several main conclusions:In the quadratic curve projective transformation is certainly in the quadratic curve the limited perspective synthesis;In the quadratic curve involution is certainly a perspective;In the plane projective transformation becomes the projecting mapping in quadratic curve to the projecting mapping in quadratic curve.更多还原