How can I add pixels to an image?

Good day. I'm working on a signature verification system and I've encountered a problem, can anyone help me? I am trying to add pixels to my current image so that when i warp the signature, it would would still be whole. This is my cropped image

Then when we warped it, it looks like this,

Some points are gone which would surely make verification less effective.

I wanna add pixels so it would like this,

(just edited with paint) This would then produce a warped image like the one shown below.

Also if you can suggest a better method to warp the signature for a more reliable verification would surely help. Thank you and I'm hoping you can help me.

Answer 1

[Image Analyst]

The function padarray() in the Image Processing Toolbox does exactly that.

m = randi(255, 5, 5)
mPadded = padarray(m, [2, 2])

In the command window:

m =
    97    19   174    94   224
   203   152   113   203   183
   192   160    23     2   129
   167    35   111    65    16
    33     6   181    84    31
mPadded =
     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0
     0     0    97    19   174    94   224     0     0
     0     0   203   152   113   203   183     0     0
     0     0   192   160    23     2   129     0     0
     0     0   167    35   111    65    16     0     0
     0     0    33     6   181    84    31     0     0
     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0

[Princess Aldovino]

thank you so much :)