A new IDCT-DFT relationship reducing the IDCT computational cost |
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| Authors: | Diab C. Oueidat M. Prost R. |
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| Affiliation: | Inst. of Appl. & Economic Sci. (ISAE), Beirut ; |
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| Abstract: | This paper reconsiders the discrete cosine transform (DCT) algorithm of Narashima and Peterson (1978) in order to reduce the computational cost of the evaluation of N-point inverse discrete cosine transform (IDCT) through an N-point FFT. A new relationship between the IDCT and the discrete Fourier transform (DFT) is established. It allows the evaluation of two simultaneous N-point IDCTs by computing a single FFT of the same dimension. This IDCT implementation technique reduces by half the number of operations |
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