Define origin and length of the Strel function

I'm trying to create the following structuring element (SE):

The underline bar represents the origin of the SE.

For example, if I want an SE of and with length equal to 3, how could I do it through the strel function?

Answer 1

[DGM]

No need for strel().

A = false(7);
A(4,4) = true

A = 7×7 logical array
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   0   0   1   0   0   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0

st1 = [1 1 1 0 0 ];
B1 = imdilate(A,st1)

B1 = 7×7 logical array
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   1   1   1   0   0   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0

st2 = [0 0 1 1 1];
B2 = imdilate(A,st2)

B2 = 7×7 logical array
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   0   0   1   1   1   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0
   0   0   0   0   0   0   0

[Luccas S.]

Ok thanks!

If I have a signal formed by a column vector. So I should put st1 and st2 in vector form too, like: st1 = [1; 1; 1; 0; 0] To apply imdilate?