CENTRAL PROJECTION OF CIRCLE
GU Qi-yuan, Chen Mingwei · Journal of Hainan Normal University · 2000
In this paper,By coordinate method We should build up a nonlinear correspondence relation,Between images (central projetion) in coordinate plane xoy of identity circle in coordinate plane xoz and center of projection.And discuss the traces of center of projection,When the protective images is ellipses,hyperbolas,parabolas,circles and equilateral hyperbolas.