matlab 中有提取图像特征点的函数吗？

本人恰巧正在做角点的提取与匹配，特征点有很多种，看是基于区域还是边缘，先是要检测特征点，这个主要是利用微分，然后再提取，貌似没有现成的函数，这个给你参考一下，效果还可以
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Harris提取算法
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clc,clear all;
filename='camera2.bmp';
X= imread(filename); % 读取图像
Info=imfinfo(filename); %这个要习惯用
% f=rgb2gray(X);
f=X;

ori_im=double(f)/255; %unit8转化为64为双精度double64
fx = [-2 -1 0 1 2]; % x方向梯度算子(用于Harris角点提取算法)
Ix = filter2(fx,ori_im); % x方向滤波 善于使用filter
% fy = [5 8 5;0 0 0;-5 -8 -5]; % 高斯函数一阶微分，y方向(用于改进的Harris角点提取算法)
fy = [-2;-1;0;1;2]; % y方向梯度算子(用于Harris角点提取算法)
Iy = filter2(fy,ori_im); % y方向滤波
Ix2 = Ix.^2;
Iy2 = Iy.^2;
Ixy = Ix.*Iy;
clear Ix;
clear Iy;