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/*Description
This function computes the inverse 2-D discrete cosine transform of matrix X. If M and N are specified, the input is either padded or truncated to have M rows and N columns.
Calling Sequence
Y = idct2(X)
Y = idct2(X, M, N)
Y = idct2(X, [M, N])
Parameters
X: Matrix or integer
M, N: If specified Matrix X is padded with M rows and N columns.
Examples
idct2(3, 4, 6)
ans =
2.811261 0.612372 -0.525856 0.250601 0.612372 -0.086516 */
function y = idct2 (x, m, n)
funcprot(0);
rhs=argn(2);
select (rhs)
case 1 then
[m,n]=size(x);
case 2 then
n=m(2);
m=m(1);
end
if m==1 then
y=idct1(x.',n).';
elseif n==1 then
y=idct1(x,m);
else
y=idct1(idct1(x,m).',n).';
end
endfunction
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