Pure Matlab implementation of SIFT keypoint Detection, Extraction and Matching
% load image
I = imread('cameraman.tif');
% extract SIFT frames and descriptor
[f, d] = SIFT(I);
% plot frames
plot_descriptor(I, f)
A deep explantion about SIFT can be found on
Anatomy of the SIFT Method "http://www.ipol.im/pub/art/2014/82/article.pdf"