Extract submatrix from matrix.

Let's say that we have a matrix ( m x n ). This matrix contains values of 0 and 1. There is a "square shape" inside that matrix that is filled with 1. And another "shape" let's say filled with 1. How can i extract those "shapes" and create 2 separate matrices from them?

0 0 0 0 0 1 1 1
0 1 1 0 0 1 1 1
0 1 1 0 0 0 0 0
0 0 0 0 0 0 0 0

Something like this . How can i create from this matrix only this matrix:

1 1
1 1

And this:

1 1 1
1 1 1

Answer 1

[Matt J]

>> S=regionprops(yourMatrix>0,'Image');
>> S.Image

ans =

  2×2 logical array

   1   1
   1   1


ans =

  2×3 logical array

   1   1   1
   1   1   1

[Giura Ionut]

Thank you for your answer sir, but i would like to find out an algorithm for that, not to use the Image Processing Toolbox.

I'm thinking about something like this: The values are 0 or 1. If the next value is higher than the previous value it means that here starts my shape and i should put those values ( while my previous value is smaller than the next one ) in another matrix, or simpler if value equals 1, but the problem is that i have no ideea how to do that because the size of my new matrix is unknown. The shape can vary in size. And i have no ideea how to count how many 1s are there on width and height. I tried with contors but i always end up with something like the aria.

This would be the code for values transfer:

for i=1:width
    for i=1:height
        if (matrix(i,j)==1)
            newmatrix(x,y)=matrix(i,j);
        end
    end
end