This a good learning sift algorithm code contains some examples for everyone to learn.

sift new\sift-1.1.1_20070330_win\beaver.png
........\.......................\beaver.sift
........\.......................\beaver_xform.png
........\.......................\ChangeLog.txt
........\.......................\dspfeat.c
........\.......................\imgfeatures.c
........\.......................\imgfeatures.h
........\.......................\kdtree.c
........\.......................\kdtree.h
........\.......................\LICENSE.txt
........\.......................\LICENSE.ubc.txt
........\.......................\match.c
........\.......................\minpq.c
........\.......................\minpq.h
........\.......................\README.txt
........\.......................\sift.c
........\.......................\sift.h
........\.......................\siftfeat.c
........\.......................\utils.c
........\.......................\THANKS.txt
........\.......................\utils.h
........\.......................\xform.c
........\.......................\xform.h
........\.......................\siftFeat\siftFeat.vcproj
........\.......................\........\siftFeat.ncb
........\.......................\........\siftFeat.sln
........\.......................\........\siftFeat.suo
........\.......................\match\match.sln
........\.......................\.....\match.vcproj
........\.......................\.....\match.vcproj.BIT.EthanHu.user
........\.......................\.....\UpgradeLog.XML
........\.......................\.....\_UpgradeReport_Files\UpgradeReport.css
........\.......................\.....\....................\UpgradeReport.xslt
........\.......................\.....\....................\UpgradeReport_Minus.gif
........\.......................\.....\....................\UpgradeReport_Plus.gif
........\.......................\.....\....................\Thumbs.db
........\.......................\dspFeat\dspFeat.sln
........\.......................\.......\dspFeat.ncb
........\.......................\.......\dspFeat.vcproj
........\.......................\.ocs\html\annotated.html
........\.......................\....\....\doxygen.css
........\.......................\....\....\doxygen.png
........\.......................\....\....\files.html
........\.......................\....\....\formula.repository
........\.......................\....\....\form_0.png
........\.......................\....\....\form_1.png
........\.......................\....\....\form_10.png
........\.......................\....\....\form_11.png
........\.......................\....\....\form_12.png
........\.......................\....\....\form_13.png
........\.......................\....\....\form_2.png
........\.......................\....\....\form_3.png
........\.......................\....\....\form_4.png
........\.......................\....\....\form_5.png
........\.......................\....\....\form_6.png
........\.......................\....\....\form_7.png
........\.......................\....\....\form_8.png
........\.......................\....\....\form_9.png
........\.......................\....\....\functions.html
........\.......................\....\....\functions_vars.html
........\.......................\....\....\globals.html
........\.......................\....\....\globals_defs.html
........\.......................\....\....\globals_enum.html
........\.......................\....\....\globals_func.html
........\.......................\....\....\globals_type.html
........\.......................\....\....\imgfeatures_8h.html
........\.......................\....\....\index.html
........\.......................\....\....\kdtree_8h.html
........\.......................\....\....\minpq_8h.html
........\.......................\....\....\sift_8h.html
........\.......................\....\....\structdetection__data.html
........\.......................\....\....\structfeature.html
........\.......................\....\....\structkd__node.html
........\.......................\....\....\structmin__pq.html
........\.......................\....\....\structpq__node.html
........\.......

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