David D G.Object Recognition from Local Scale-invariant Features[C]//Proceedings of the 1999 7th IEEE International Conference on Computer Vision(ICCV'99),Kerkyra,Greece,September 20~27,1999.Piscataway:IEEE,1999:1150-1157.
[8]
David D G.Distinctive Image Features from Scale-invariant Keypoints[J].International Journal of Computer Vision(S0920-5691),2004,60(2):91-110.