sift
代码说明：
说明： SIFT特征点的提取和匹配，SIFT算法首先在尺度空间上进行关键点检测，确定关键点的位置和关键点所处的尺度，然后使用关键点邻域梯度的主方向作为该点的方向特征，最后由关键点邻域梯度信息生成关键点的特征向量(SIFT algorithm firstly detects the key points in the scale space, determines the location of the key points and the scale of the key points, then uses the main direction of the key point neighborhood gradient as the direction feature of the point, and finally generates the feature vector of the key points from the key point neighborhood gradient information)
文件列表：
sift, 0 , 2020-01-08
sift\1.jpg, 203710 , 2018-12-14
sift\2.jpg, 69363 , 2005-06-10
sift\appendimages.m, 461 , 2005-07-08
sift\basmati.pgm, 46433 , 2005-07-08
sift\book.pgm, 97697 , 2005-07-08
sift\box.pgm, 72310 , 2005-07-08
sift\defs.h, 1920 , 2005-07-08
sift\LICENSE, 1055 , 2005-07-08
sift\Makefile, 631 , 2005-07-08
sift\match.c, 4876 , 2005-07-08
sift\README, 7952 , 2005-07-08
sift\scene.pgm, 196623 , 2005-07-08
sift\showkeys.m, 1699 , 2005-07-08
sift\sift, 45070 , 2005-07-08
sift\sift.m, 2432 , 2020-01-08
sift\siftWin32.exe, 94208 , 2005-07-08
sift\tmp.jpg, 90015 , 2020-01-08
sift\tmp.key, 469364 , 2020-01-08
sift\Untitled6.m, 116 , 2020-01-08
sift\util.c, 7493 , 2005-07-08
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