一、原理
二、实现
close all;
clear all;
I=imread('test.tif');
[posX,posY]=harris(I);
figure;imshow(I);
hold on; plot(posX, posY, 'g*');
function [posX,posY]=harris(I)
%Harris角点检测
%I:输入图像
%posX:角点X坐标
%posY:角点Y坐标
I=double(I);
[m,n]=size(I);
hx=[-,,;-,,;-,,];
Ix=imfilter(I,hx,'replicate','same');%X方向差分图像
Iy=imfilter(I,hx','replicate','same');%Y方向差分图像
Ix2=Ix.^;
Iy2=Iy.^;
Ixy=Ix.*Iy;
h=fspecial('gaussian',,);
Ix2=imfilter(Ix2,h,'replicate','same');%高斯滤波
Iy2=imfilter(Iy2,h,'replicate','same');
Ixy=imfilter(Ixy,h,'replicate','same');
R=zeros(m,n);
k=0.04;%建议值(0.04--0.06)
for i=:m
for j=:n
R(i,j)=(Ix2(i,j)*Iy2(i,j)-Ixy(i,j)*Ixy(i,j))-k*((Ix2(i,j)+Iy2(i,j))^);%角点响应值
end
end
T=0.1*max(R(:));% 阈值,可控制返回的角点个数
result=zeros(m,n);
%非极大值抑制(*3窗口中大于阈值T的局部极大值点被认为是角点)
for i=:m-
for j=:n-
tmp=R(i-:i+,j-:j+);
tmp(,)=;
if(R(i,j)>T&&R(i,j)>max(tmp(:)))
result(i,j)=;
end
end
end
[posY,posX]=find(result);
结果: