Discrete Cosine Transform: Difference between revisions

From MultimediaWiki
Jump to navigation Jump to search
m (link to DCT file format)
m (typo)
 
Line 1: Line 1:
:''For the Electonic Arts DCT file format, see [[Electronic Arts DCT]].''
:''For the Electronic Arts DCT file format, see [[Electronic Arts DCT]].''


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. There are eight standard DCT variants, of which four are common.
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. There are eight standard DCT variants, of which four are common.

Latest revision as of 12:43, 21 April 2008

For the Electronic Arts DCT file format, see Electronic Arts DCT.

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. There are eight standard DCT variants, of which four are common.