/pixeldup.m

function B = pixeldup(A, m, n)

%PIXELDUP Duplicates pixels of an image in both directions.

%   B = PIXELDUP(A, M, N) duplicates each pixel of A M times in the

%   vertical direction and N times in the horizontal direction.

%   Parameters M and N must be integers.  If N is not included, it

%   defaults to M.



%   Copyright 2002-2004 R. C. Gonzalez, R. E. Woods, & S. L. Eddins

%   Digital Image Processing Using MATLAB, Prentice-Hall, 2004

%   $Revision: 1.5 $  $Date: 2005/01/03 00:01:28 $



% Check inputs.

if nargin < 2 

   error('At least two inputs are required.'); 

end

if nargin == 2 

   n = m; 

end



% Generate a vector with elements 1:size(A, 1).

u = 1:size(A, 1);



% Duplicate each element of the vector m times.

m = round(m); % Protect against nonintegers.

u = u(ones(1, m), :);

u = u(:);



% Now repeat for the other direction.

v = 1:size(A, 2);

n = round(n);

v = v(ones(1, n), :);

v = v(:);

B = A(u, v);