finding pixel near border

Question

Mohammad Golam Kibria 2011-8-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/13429-finding-pixel-near-border

Hi, I have a matrix as follows:

I =

   0     0     0     0     1
   1     0     0     1     0
   1     0     1     0     0
   0     1     0     0     0
   1     0     1     1     0
   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.

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Answer 1

Friedrich 2011-8-10

0
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https://ww2.mathworks.cn/matlabcentral/answers/13429-finding-pixel-near-border#answer_18334

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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])