?? spatiallp.m
字號:
%Question No:13
%SPATIAL AVERAGING/LOW-PASS FILTERING
function spatiallp(x)
f=imread(x);
f=im2double(f);
[r,c]=size(f);
for i=1:r
for j=1:c
ip=i+1;
im=i-1;
jm=j-1;
jp=j+1;
if(im<1)
im=i;
elseif (ip>r)
ip=i;
end
if(jm<1)
jm=j;
elseif (jp>c)
jp=j;
end
T(i,j)=(1/2)*(f(i,j)+ (1/4)*(f(i,jm)+f(i,jp)+f(ip,j)+f(im,j)));
S(i,j)=(1/9)*(f(i,j)+ f(i,jm)+f(i,jp)+f(ip,j)+f(im,j)+f(im,jm)+f(ip,jm)+f(ip,jp)+f(im,jp));
end
end
imshow(f), figure, imshow(T),figure,imshow(S);
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