特别牛的SIFT实现，VLFeat 0.9.13，代码特别清晰。C语言编写，有matlab接口。还包括了SIFT, MSER, k-means, hierarchical k-means等相关算法。-A library implements popular computer vision algorithms including SIFT, MSER, k-means, hierarchical k-means.

VLFEAT,一个强大的SIFT库函数,适合MATLAB和VC应用-VLFEAT, a powerful SIFT library functions for MATLAB and VC application