中文说明：matlab和c语言现检测特征点并匹配的sift代码，里面有三个m文件，match、sift、appendingimages，因为只支持灰度图像，所以在使用之前将彩色图像变为灰度图像，（matlab用rgb2gray函数）就可以实现图像拼接。
English Description：
MATLAB and c language detection and matching of feature points of the SIFT code, there are three m files, match, and sift, and appendingimages, because it supports only grayscale images, so before using a color image into a grayscale image, (the MATLAB rgb2gray function) you can achieve image mosaic.