matlab - How can I put margins in an image?

Question

I have a binary image of 18x18 pixels and I want to put margins around this image with the purpose of obtaining an image 20x20 pixels.

The image is binary and it can be represented by a matrix of 1s and 0s. The 0 pixels are in black colour and the 1 pixels are in white colour. I need to put margins of 1 pixel of zeros around the image that I have.

How can I do it?

Answer 1

The padarray function from the image processing toolbox can be used for this purpose:

B=padarray(A,[1,1])