SIFT algorithm literature (PDF) and code can be a thorough understanding of the essence with the SIFT algorithm.

SIFT
....\sift+vc
....\.......\SIFT_VC


....\.......\.......\downimg_matched_points.xml
....\.......\.......\dspfeat.c
....\.......\.......\imgfeatures.c
....\.......\.......\imgfeatures.h
....\.......\.......\kdtree.c
....\.......\.......\kdtree.h
....\.......\.......\match.c
....\.......\.......\match.cpp
....\.......\.......\minpq.c
....\.......\.......\minpq.h
....\.......\.......\sift.c
....\.......\.......\sift.h
....\.......\.......\siftfeat.c
....\.......\.......\SIFT_VC.dsp
....\.......\.......\SIFT_VC.dsw
....\.......\.......\SIFT_VC.ncb
....\.......\.......\SIFT_VC.opt
....\.......\.......\SIFT_VC.plg
....\.......\.......\upimg_matched_points.xml
....\.......\.......\upimg_matched_points.yml
....\.......\.......\utils.c
....\.......\.......\utils.h
....\.......\.......\xform.c
....\.......\.......\xform.h
....\SIFT_Papers
....\...........\SIFT01_Early_iccv99.pdf
....\...........\SIFT02_RecentSummary_ijcv03.pdf
....\...........\SIFT03_3Drec_cvpr01.pdf
....\...........\SIFT04_AffineMatch_bmvc2002.pdf
....\...........\SIFT05_PerformanceEval_01211478.pdf
....\...........\SIFT06I1_For_Edges_mikolajczyk03a.pdf
....\...........\SIFT06I2_for_texture_varma03.pdf
....\...........\SIFT06M1_Localization2_Map_iros02.pdf
....\...........\SIFT06M2_LocalizeFeatures_iros02b.pdf
....\...........\SIFT06M3_RecPanoramas_brown03.pdf
....\...........\SIFT06M4_VideoRetrieval.pdf

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