Introduction - If you have any usage issues, please Google them yourself
Approximation of discrete cosine transform (DCT)
is useful for reducing its computational complexity without sig-
nificant impact on its coding performance. Most of the existing
algorithms for approximation of the DCT target only the DCT of
small transform lengths, and some of them are non-orthogonal.
This paper presents a generalized recursive algorithm to obtain
orthogonal approximation