SIFT algorithm roughly four steps: 1, the scale space extremum detection. In the scale space to detect potential points of interest for the scale and rotation invariant differential by a Gaussian function. 2, the key point positioning. In point of interest position, determine the location and scale of key points. 3, to determine the direction. Based on local gradient direction, the direction assigned to each key. 4, the key point description. Local image gradient measurements within each key field. With a final feature vector to express.

sift alghrithms\appendimages.m
...............\basmati.pgm
...............\book.pgm
...............\box.pgm
...............\defs.h
...............\LICENSE
...............\Makefile
...............\match.c
...............\match.m
...............\README
...............\scene.pgm
...............\showkeys.asv
...............\showkeys.m
...............\sift
...............\sift.m
...............\siftWin32.exe
...............\util.c
sift alghrithms

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