1、理想低通滤波器Matlab程序M=256;N=256;d0=50;m=fix(M/2);n=fix(N/2);%h=zeros(256,256);fori=1:Mforj=1:Nd=sqrt(i-m)A2+(j-n)A2);if(d=d0)h(i,j)=1；elseh(i,j)=0;endendendmesh(h)2、巴特沃斯低通滤波器Matlab程序clc;clear;M=256;N=256;d0=50;n=2;m=fix(M/2);n=fix(N/2);%h=zeros(256,256);fori=1:Mforj=1:Nd=sqrt(i-m)A2+(j-n)A2);h(i,j)=1/(1+*(d/d0(2*2);endendmesh(h)axisoff2、高斯低通滤波器Matlab程序clc;clear;M=256;N=256;d0=50;m=fix(M/2);n=fix(N/2);%h=zeros(256,256);fori=1:Mforj=1:Nd=sqrt(i-m)A2+(j-n)A2);h(i,j尸exp(-(dA2)/(2*(d0A2);endendmesh(h)axisoff