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pixeldup.m
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pixeldup.m
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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: 1.4 $ $Date: 2003/06/14 16:29:54 $
% 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 nonintergers.
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);