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Find the columns where a certain number is repeated consecutively

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I have a matrix of ones and zeros of an Image (690 x 1100)
I need to find the columns where at least 50 zeros are repeated.
Can someone help me?

Accepted Answer

Jonas
Jonas on 18 Apr 2021
quick and dirty small example
a=[ 1 1 1 0 1;...
0 1 1 0 1;...
0 0 1 1 1;...
0 1 1 1 1];
nrOfMinZerosPerCol=2;
colsWithRepetitions=~all(conv2(a,ones(nrOfMinZerosPerCol,1),'valid'),1);
  1 Comment
Yaisel Córdova Chávez
Yaisel Córdova Chávez on 21 Apr 2021
Thank you very much for your answer Jonas. I had found a way with two for, but this is faster and more efficient.

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