图像加噪，各种滤波

<span style="font-size:18px;">clc;img=imread('3.17.tif');imgn=imnoise(img,'salt & pepper',0.02);[m n]=size(img);%h=fspecial('average',[3 3]);    %   3*3的均值滤波%imgn1=imfilter(imgn,h,'replicate');%imgn=medfilt2(imgn,[3 3]);     %    3*3的中值滤波%%%%自己编写3*3均值滤波%{tem=0;for i=2:1:m-1    for j=2:1:n-1                for p=i-1:1:i+1            for q=j-1:1:j+1                tem=tem+double(imgn(p,q));            end        end        tem=tem/9;        imgn(i,j)=tem;        tem=0;    endend%}%%%%自己编写3*3中值滤波%{s=zeros(1,9);for i=2:1:m-1    for j=2:1:n-1                     he=1;        for p=i-1:1:i+1            for q=j-1:1:j+1                            s(he)=imgn(p,q);                he=he+1;                           end        end        s=sort(s);        imgn(i,j)=s(5);            endend%}imshow(imgn)</span>