php官方手册，php开发人员必读，可以学习到很多东西-Extract used to sift the characteristics of images, sift widely used in image matching, splicing, etc.

用C语言实现的Sift匹配算法，然后再用java 语言搭建界面开发了一个图像匹配测试软件A-Sift using C language implementation of matching algorithm, and then use the java language interface development to build a test image matching software App

sift算法是一种检测局部特征的算法，该算法通过求一幅图中的特征点（interest points,or corner points）及其有关scale 和 orientation 的描述子得到特征并进行图像特征点匹配，获得了良好效果-Sift algorithm is a kind of partial feature detection algorithm, the algorithm by calculating a picture of the feature points (inter