matlab练习程序（Harris角点检测）

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转自：http://www.cnblogs.com/tiandsp/archive/2012/04/09/2439678.html

close all;clear all;clc;img=imread('rice.png');imshow(img);[m n]=size(img);tmp=zeros(m+2,n+2);tmp(2:m+1,2:n+1)=img;Ix=zeros(m+2,n+2);Iy=zeros(m+2,n+2);E=zeros(m+2,n+2);Ix(:,2:n)=tmp(:,3:n+1)-tmp(:,1:n-1);Iy(2:m,:)=tmp(3:m+1,:)-tmp(1:m-1,:);Ix2=Ix(2:m+1,2:n+1).^2;Iy2=Iy(2:m+1,2:n+1).^2;Ixy=Ix(2:m+1,2:n+1).*Iy(2:m+1,2:n+1);h=fspecial('gaussian',[7 7],2);Ix2=filter2(h,Ix2);Iy2=filter2(h,Iy2);Ixy=filter2(h,Ixy);Rmax=0;R=zeros(m,n);for i=1:m    for j=1:n        M=[Ix2(i,j) Ixy(i,j);Ixy(i,j) Iy2(i,j)];        R(i,j)=det(M)-0.06*(trace(M))^2;                if R(i,j)>Rmax            Rmax=R(i,j);        end    endendre=zeros(m+2,n+2);tmp(2:m+1,2:n+1)=R;img_re=zeros(m+2,n+2);img_re(2:m+1,2:n+1)=img;for i=2:m+1    for j=2:n+1                if tmp(i,j)>0.01*Rmax &&...           tmp(i,j)>tmp(i-1,j-1) && tmp(i,j)>tmp(i-1,j) && tmp(i,j)>tmp(i-1,j+1) &&...           tmp(i,j)>tmp(i,j-1) && tmp(i,j)>tmp(i,j+1) &&...           tmp(i,j)>tmp(i+1,j-1) && tmp(i,j)>tmp(i+1,j) && tmp(i,j)>tmp(i+1,j+1)                img_re(i,j)=255;         end              endendfigure,imshow(mat2gray(img_re(2:m+1,2:n+1)));

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