1-sift.m 检测特征点(返回图像的SIFT特征点)+构建特征点描述子 % [descriptors, locs] = sift(img)%% This function returns IMAGE's SIFT keypoints.% Input parameters:% img: the image.%% Returned:% descriptors: a K-by-128 matrix, where each row gives an invariant% descriptor for one of the...