Kockanek D H U. Interpolating spline for keyframe animation,In: Proceedings of Graphics Interface\\'84, Nat. Pes. Council of Canada, Ottawa, Ont., Canada,1984:41-42.
[3]
王之卓.摄影测量原理[M].北京:测绘出版社,1979..
[4]
Bethel E W, Uselton S P. Shape distortion in computer-assisted keyframe animation, State-of-the-Art in Computer Animation.In: Proceedings of Computer Animation\\'89, Springer-Verlog,Tokyo, Japan, 1989: 215-224.
[5]
Jean Philippe, Thirio. Realistic 3D simulation of shapes and shadows for image Processing, Graphical Models and Image Processing, 1992,54(1):82-90.