SIFT
代码说明：
图像检索中经典的SIFT方法matlab实现，由NTU的大牛撰写，做了些批注。(SIFT for image retrieval，feature extraction and matching)
文件列表：
SIFT
....\demo-data
....\descriptor
....\..........\do_descriptor.m,5290,2006-11-17
....\do_demo_1.m,867,2006-11-20
....\do_demo_2.asv,2126,2006-11-20
....\do_demo_2.m,1189,2006-11-20
....\do_demo_3.m,1171,2006-11-20
....\do_demo_4.m,1186,2006-11-20
....\do_sift.m,3972,2006-11-20
....\key-location
....\............\do_extrefine.m,3799,2006-11-15
....\............\do_localmax.asv,1992,2006-11-17
....\............\do_localmax.m,1991,2006-11-17
....\main.m,140,2006-05-04
....\match
....\.....\do_match.asv,4748,2006-11-15
....\.....\do_match.m,4879,2006-11-20
....\orientation
....\...........\do_orientation.m,2366,2006-11-17
....\README.txt,2387,2006-11-20
....\README.txt.bak,2387,2006-11-20
....\scale-space
....\...........\do_diffofg.m,464,2006-11-14
....\...........\do_gaussian.m,2639,2006-11-14
....\...........\smooth.m,215,2006-11-14
....\sift_demo.m,1637,2006-11-14
....\util
....\....\appendimages.m,359,2006-11-15
....\....\imreadbw.m,301,2006-11-16
....\....\plotsiftdescriptor.asv,3408,2006-11-17
....\....\plotsiftframe.m,1853,2006-11-20
....\....\plotss.m,640,2006-11-20
....\....\tightsubplot.m,1859,2006-11-20
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