Adding zeros to matrix

I have to do image processing. I have one data with 100 x 100 matrix and another with 300 x 300 matrix. I want to add zeros to 100 x100 matrix to equalize it like 300 x300 but zeros to be added after 100 x 100 equally and not in particular end.

Answer 1

[Bruno Luong]

% Replace this with your image
Image100 = peaks(100)+10;

%Centering padding in 4 sides
PadImage300 = zeros(300,300,size(Image100,3),class(Image100));
PadImage300(101:200,101:200,:) = Image100;

imagesc(PadImage300)

Answer 2

[KSSV]

Let A be your 100*100 matrix.

B = zeros(300) ; 
B(1:100,1:100) = A ; 

[Anjali Sharma]

Thank you for the answer.

This yield a matrix with zeros added at the end of my data matrix.

Suppose A =

1 2

3 4

I want zeros to be added like this

A =

0 0 0 0 0 0

0 0 0 0 0 0

0 0 1 2 0 0

0 0 3 4 0 0

0 0 0 0 0 0

0 0 0 0 0 0

equally all aorund. The data should lie in between zeros.

Can you pls suggest anything here.

[KSSV]

A = rand(2) ; 
[m,n] = size(A) ; 
B = zeros(3*m,3*n) ; 
B((m+1):2*m,(n+1):2*n) = A ; 

Also read about padarray

[Anjali Sharma]

Yes this worked..!!!

Thank you.

Unfortunately I dont have Image toolbox so cant use padarray otherwise it could be easy.