MATLAB: Bidirectional concatenation using cat (image zero-padding)

Question

I am trying to zero-pad the borders of an image by a certain amount (xPad, yPad) using the cat function. It takes four lines of code to achieve this. For instance, for the padding in the y direction I have:

[x, y] = size(Image);
padI = cat(2, Image, zeros(x,yPad));
padI = cat(2, zeros(x,yPad),padI);

Is it possible to concatenate in both directions similataneously using a single line of code (i.e., using cat only once)?

Any suggestions are greatly appreciated.

Answer 1

You could write a function for this purpose:

function ImgP = ImagePad(Img, xPad, yPad)
siz  = size(Img);
ImgP = zeros(siz + 2 * [XPad, YPad], class(Img));
ImgP(XPad + 1:XPad + siz(1), YPad + 1:YPad + siz(2)) = Img;