Assuming i have the image below,

```
I = [1 1 1 3 3 3 3 3
     1 1 1 1 3 3 3 3
     1 1 1 1 3 3 3 3
     1 1 1 1 2 2 2 3
     1 1 1 1 2 2 2 3
     1 1 1 1 2 2 2 3
     1 1 1 1 2 2 2 2];

```

How can i fit a square of size `two pixels` around the point `(4,6)`?

I have been able to find the vertices using the formula:

```
center = [4,6];
Lowerleftvertex  = center - [-2, 2];
Upperrightvertex = center - [2, -2];

```

I am not sure if this is the right way to go about this. Please I'd appreciate any help or suggestions or advice. Thank you!