用MATLAB编程实现均值滤波算法?

1：smoothingAverageFilterMain.m

clc;clear;

fid = fopen('lenai.raw');

temp= fread(fid, [256,256]);

LenaRaw=uint8(temp');

subplot(1,2,1)

Imshow(LenaRaw);

title('原始图像')

subplot(1,2,2)

Imshow(smoothingAverageFilter(LenaRaw,3));

title('自制函数，使用用3*3模板，均值滤波图像')

2：smoothingAverageFilter.m

function returnData=smoothingAverageFilter(arg,arg2)

[Iwidth,Ilength]=size(arg);

temp=double(arg);

returnData=zeros(Iwidth,Ilength);

totalLength=arg2*arg2;

for i=1:Iwidth-arg2+1

for j=1:Ilength-arg2+1

% temp(i,j)=average(arg(i:i+arg2,j:j+arg2));

sum=0.0;

for n=1:arg2

for k=1:arg2

sum=sum+temp(i+n-1,j+k-1);

end

end

returnData(i,j)=sum/totalLength;

end

end

returnData=uint8(returnData);

end