SIFT描述子提取，有参考rob hess源码，将SIFT的每个过程的金字塔图像都进行了保存，方便作为示范和学习。-SIFT descr iptor extraction, refer to rob hess source code, save each pyramid image for convenient as a demonstration and learning.

用opencv实现了高斯金字塔，得到了图像的sift特征点，并得到了不同高斯尺度下得图形-Gaussian pyramid with opencv obtained image sift feature point, and has been obtained under different graphical Gaussian scale

vs2010下两张图片之间、进行sift匹配，角点LK金字塔光流跟踪，surf匹配。有绘制特征点主方向和辅助方向。具体仔细看代码。-vs2010 down between two pictures, make sift matching corner pyramid LK optical flow tracking, surf match. Have drawn the main direction of the feature points and the auxiliary directio

sift 演算法 包含高斯金字塔、高斯差分、特徵點描述、特整點比對-sift algorithm