s093.m

简单的数字图像处理程序

% 经典频域理想低通滤波器  s093
clear;
I93=imread('2.jpg');
I930=rgb2gray(I93);
i2=imnoise(I930,'salt & pepper',0.001);
f=double(i2);
g=fft2(f);
g=fftshift(g);
[N1,N2]=size(g);
d0=50;
n1=fix(N1/2);
n2=fix(N2/2);
for i=1:N1
   for j=1:N2
     d=sqrt((i-n1)^2+(j-n2)^2);
     if d<5
         h(i,j)=1;
         else
         h(i,j)=0;
     end
   result(i,j)=h(i,j)*g(i,j);
   end
end
result=ifftshift(result);
x2=ifft2(result);
x3=uint8(real(x2));
subplot(1,2,1),imshow(i2);
subplot(1,2,2),imshow(x3)