Discrete cosine transforms
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found: Work cat.: Rao, K.R. Discrete cosine transform, 1990.
found: Wikipedia, Apr. 6, 2007(Discrete cosine transform -- A discrete cosine transform (DCT) is a Fourier-related transform similar to the discrete Fourier transform (DFT), but using only real numbers. DCTs are equivalent to DFTs of roughly twice the length, operating on real data with even symmetry (since the Fourier transform of a real and even function is real and even), where in some variants the input and/or output data are shifted by half a sample)
found: FOLDOC, Apr. 6, 2007(discrete cosine transform -- mathematics -- (DCT)-- A technique for expressing a waveform as a weighted sum of cosines. The DCT is central to many kinds of signal processing, especially video compression)
found: Answers.com, Apr. 4, 2007(DCT -- (discrete cosine transform) -- An algorithm that is widely used for data compression. Similar to fast Fourier transform, DCT converts data (pixels, waveforms, etc.) into sets of frequencies)
notfound: MathWorld, via WWW, Apr. 6. 2007;Glossary of mathematical terms, via WWW, Apr. 6, 2007;James R.C. Mathematics dictionary, 1992;The Penguin dictionary of mathematics, 1989;Encyclopedic dictionary of mathematics, 1987
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2007-10-03: new
2019-07-31: revised
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