matlab 的 Difference of Gaussian 算法实现，很常用的算法-matlab the Difference of Gaussian algorithm, it is commonly used algorithm

This a MATLAB implementation of the SIFT keypoint detector and descr iptor -do_gaussian: generate Gaussian scale space of input image do_diffofg: generate Difference of Gaussian (DoG) scale space do_localmax: local extrema as the potential keyp