Replace and add element under specific condition

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Firas Al-Kharabsheh 2016-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/276912-replace-and-add-element-under-specific-condition

评论： Firas Al-Kharabsheh 2016-4-4

if i have this a (n,m) tow matrix A and B for example

A = [ 1 0 1 0 1
1 0 1 1
1 1 0 0
0 0 1 1
1 0 0 1 ]
B = [ 1 0 1 0 1
0 0 0 1
0 0 0 0
0 0 0 1
1 0 1 1]

I need function to do this steps

w = B(1,:)      % extract first row 
 for k:1:size(w) 
  if there is one in w(k) then go back to Matrix A(1,k) 
     chick if there is a one's beside it >> true 
        set in Matrix B(k) these one's 
for example B(3,:) is [1 0 0 0 0]  then go back to A(3,:) = [1 1 1 0 0] 
 then we check if there are one's neighbors to that one >> if yes 
        then put the same number of one's beside the first one and update B(3,:)
            so B(3,:) will be [1 1 1 0 0]

Note : can't we say B(3,:) | A(3,:) because for example

   the B(end,:) = [ 1
                    1
                    0
                    1
                    1 ]

then we chick A(2,end) [0 1 0 1 1] >> we see there is a just one beside it so the update on the second row in B will be like this [ 0 0 0 1 1]

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Azzi Abdelmalek 2016-4-3

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Answer 1

Image Analyst 2016-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/276912-replace-and-add-element-under-specific-condition#answer_216261

在 MATLAB Online 中打开

How about this, which uses morphological reconstruction:

marker = B;
mask = A;
C = imreconstruct(marker,mask, 4)
C =
     1     0     1     0     1
     0     1     0     1     1
     1     1     1     0     0
     1     0     0     1     1
     1     1     0     0     1