%this code is the Matlab implimentation of David G. Lowe,
%"Distinctive image features from scale-invariant keypoints,"
%International Journal of Computer Vision, 60, 2 (2004), pp. 91-110.
%this code should be used only for academic research.
%any other useage of this code should not be allowed without Author agreement.
% if you have any problem or improvement idea about this code, please
% contact with Xing Di, Stevens Institution of Technology. xdi2@stevens.edu