A good sift algorithm instance, there are pictures and the truth, you can achieve the matching feature points, and the two images match point connection, you can also achieve stitching, there are a few demo. Help them to learn.

SIFT
....\.DS_Store
__MACOSX
........\SIFT
........\....\._.DS_Store
SIFT\demo-data
....\.........\beaver11.bmp
__MACOSX\SIFT\demo-data
........\....\.........\._beaver11.bmp
SIFT\demo-data\beaver13.bmp
__MACOSX\SIFT\demo-data\._beaver13.bmp
SIFT\demo-data\image068.jpg
__MACOSX\SIFT\demo-data\._image068.jpg
SIFT\demo-data\image069.jpg
__MACOSX\SIFT\demo-data\._image069.jpg
SIFT\demo-data\view01.png
__MACOSX\SIFT\demo-data\._view01.png
SIFT\demo-data\view02.png
__MACOSX\SIFT\demo-data\._view02.png
SIFT\descriptor
....\..........\do_descriptor.asv
__MACOSX\SIFT\descriptor
........\....\..........\._do_descriptor.asv
SIFT\descriptor\do_descriptor.m
__MACOSX\SIFT\descriptor\._do_descriptor.m
SIFT\do_demo_1.m
__MACOSX\SIFT\._do_demo_1.m
SIFT\do_demo_2.m
__MACOSX\SIFT\._do_demo_2.m
SIFT\do_demo_3.m
__MACOSX\SIFT\._do_demo_3.m
SIFT\do_demo_4.m
__MACOSX\SIFT\._do_demo_4.m
SIFT\do_sift.m
__MACOSX\SIFT\._do_sift.m
SIFT\key-location
....\............\do_extrefine.m
__MACOSX\SIFT\key-location
........\....\............\._do_extrefine.m
SIFT\key-location\do_localmax.m
__MACOSX\SIFT\key-location\._do_localmax.m
SIFT\main.m
__MACOSX\SIFT\._main.m
SIFT\match
....\.....\do_match.asv
__MACOSX\SIFT\match
........\....\.....\._do_match.asv
SIFT\match\do_match.m
__MACOSX\SIFT\match\._do_match.m
SIFT\orientation
....\...........\do_orientation.m
__MACOSX\SIFT\orientation
........\....\...........\._do_orientation.m
SIFT\scale-space
....\...........\do_diffofg.m
__MACOSX\SIFT\scale-space
........\....\...........\._do_diffofg.m
SIFT\scale-space\do_gaussian.m
__MACOSX\SIFT\scale-space\._do_gaussian.m
SIFT\scale-space\smooth.m
__MACOSX\SIFT\scale-space\._smooth.m
SIFT\sift_demo.m
__MACOSX\SIFT\._sift_demo.m
SIFT\util
....\....\appendimages.m
__MACOSX\SIFT\util
........\....\....\._appendimages.m
SIFT\util\imreadbw.m
__MACOSX\SIFT\util\._imreadbw.m
SIFT\util\plotsiftframe.m
__MACOSX\SIFT\util\._plotsiftframe.m
SIFT\util\plotss.m
__MACOSX\SIFT\util\._plotss.m
SIFT\util\tightsubplot.m
__MACOSX\SIFT\util\._tightsubplot.m

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