finding pixel near border
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Hi, I have a matrix as follows:
I =
1 0 0 0 0 1
0 1 0 0 1 0
0 1 0 1 0 0
0 0 1 0 0 0
0 1 0 1 1 0
1 0 0 0 0 1
here 4 ones are in the total matrix boundary position. Is there any easy way that will return me the position of those pixel i.e. for this matrix (1,1),(6,1),(1,6),(6,6) thanks in advance.
采纳的回答
Friedrich
2011-8-10
Hi,
maybe this:
I =[
1 0 0 0 0 1
0 1 0 0 1 0
0 1 0 1 0 0
0 0 1 0 0 0
0 1 0 1 1 0
1 0 0 0 0 1 ];
[x y] = size(I);
tmp = zeros(x,y);
tmp(1,:) = ones(1,y);
tmp(x,:) = ones(1,y);
tmp(:,1) = ones(x,1);
tmp(:,y) = ones(x,1);
[i j] = find(I.*tmp == 1);
disp([i,j])
2 个评论
Mohammad Golam Kibria
2011-8-10
Andrei Bobrov
2011-8-10
a = eye(size(I))
a = a(:,end:-1:1)+a
a(2:end-1,2:end-1)=0
find(I & a)
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2011-8-10
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