用理想低通滤波器在频率域实现低通滤波、用理想高通滤波器在频率域实现高频增强(共7页).docx

作业5 1、 用理想低通滤波器在频率域实现低通滤波程序代码如下：clear;A=imread(picture4.jpg);I=rgb2gray(A);figure(1);imshow(I);title(原图像);g = imnoise(I, gaussian ,0 ,0.01);J = I+g;figure(2);imshow(J);title(加高斯噪声后图像); s=fftshift(fft2(I);figure(3);imshow(abs(s),);title(图像傅里叶变换所得频谱); a,b=size(s);a0=round(a/2);b0=round(b/2);d=150; for i=1:a for j=1:b distance=sqrt(i-a0)2+(j-b0)2); if distance=d h=1; else h=0; end; s(