How to identify area of a matrix with same values

I have a matrix of 10x10 filled with 0s and 1s. There are some areas of 0s enclosed by areas of 1s. I would like to be able to identify specific areas of 0s.

I am using ginput, so I would like to select a 0 from the matrix, and then I want Matlab to identify the area surrounding that specific 0. I believe this can be done with conv2, but I don't know how.

Answer 1

[YT]

This question is similar to this one asked before ( https://mathworks.com/matlabcentral/answers/402080-how-to-find-the-neighbors-of-each-element-in-a-matrix#answer_321522)

So if I understand it corect you want something like this

%small 5x5 example matrix
A = [0 1 0 0 0;
     1 1 0 0 0;
     0 0 1 1 1;
     0 0 1 0 1;
     0 0 1 1 1];

%create matrix with zeros with size of A
M = zeros(size(A));

%use the coordinates from ginput; M(row,col)
M(1,1) = 1;

%convolution
C = conv2(M,[1,1,1;1,0,1;1,1,1],'same')>0;

%return indices
[row col] = find(C>0);

%return values (which in your case isnt really interesting cuz will only returns 1's)
A(C)