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| B=to8bits(IM);
BW=zeros(m,n); %préaalocation en mémoire
BW = edge(B,'canny');
BW=~BW;
Ic=zeros(m,n);
c1=(m-rem(m,2))/2;
c2=(n-rem(n,2))/2;
% diviion de l'image en 4 parties
% -----------------------
% | l1 | l2 |
% -----------------------
% | l3 | l4 |
% -----------------------
% cadrant l1
for(i=1:c1)
for(j=1:c2)
if(BW(i,j)== 0)
Ic(i,j)=B(i+1,j+1);
else
BW(i,j)=255;
end
end
end
% cadrant l2
for(i=c1:m)
for(j=1:c2)
if(BW(i,j)== 0)
Ic(i,j)=B(i-1,j+1);
else
BW(i,j)=255;
end
end
end
% cadrant l3
for(i=1:c1)
for(j=c2:n)
if(BW(i,j)== 0)
Ic(i,j)=B(i+1,j-1);
else
BW(i,j)=255;
end
end
end
% cadrant l4
for(i=c1:m)
for(j=c2:n)
if(BW(i,j)== 0)
Ic(i,j)=B(i-1,j-1);
else
BW(i,j)=255;
end
end
end |
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