Is there a function in MATLAB to calculate higher DCTs like DCT-III, IV etc?

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sahil sharma
sahil sharma 2022-10-13
回答： Matt J 2022-10-13
I have started learning DCT recently. I know the function dct() and dct2() are used to calculated 1-D and 2-D DCT-II repectively. Is there any function that is used to calculate the DCT-III or DCT-IV? idct() is based on DCT-III but it is not going forward into DCT domain.

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Matt J
Matt J 2022-10-13

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Matt J
Matt J 2022-10-13
编辑：Matt J 2022-10-13
I don't think so, but you can always build one from fft().
function Y=dctn(X)
d=size(X);
n=numel(d);
subs0=repmat({':'},1,n);
Y=X;
for i=1:n
subs=subs0;
subs{i}=1:d(i);
Y=fft( cat(i,Y,flip(Y,i)) ,[],i);
Y=real(Y(subs{:});
end
end

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